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1. IN201747006387 - FRAME FOR ELECTROCHEMICAL CELLS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]
WO 2016/016017 PCT/EP2015/066388 5FRAME FOR ELECTROCHEMICAL CELLSDESCRIPTION 10 TECHNICAL FIELD The invention pertains to a frame in accordance with the preamble of patent claim 1.15 PRIOR ARTThis type of frame is already established in EP 2 432 043 A1.Cells in a battery system, especially in a lithium battery system, are usually designed 20 as circular cells, prismatic cells or pouch cells. Pouch cells exhibit cell casings made from foil.Pouch cells are already used almost exclusively in mobile telephones, digital cameras or in automobiles due to the advantages of pouch cells when compared to prismatic 25 cells, especially their lower production costs. Pouch cells particularly find application in batteries for electric vehicles.A substantial technical advantage of pouch cells is their capacity to adapt to future cellular chemistry concepts.30Thus, new anode materials, especially silicon-based materials that exhibit a greatly increased lithium intake capacity and, therefore, increased volumic energy compared to current customary graphite anodes, result, for example, in a greatly increased volume work in the case of cycling.35This, in the case of prismatic cells, results in great swelling of the fixed cell casing with which mechanical problems and sealing problems are associated. This volume work in the case of pouch cells, in contrast, can be counterbalanced by the flexible foil cell casing. WO 2016/016017 2 PCT/EP2015/066388 5 Over and above this, some cells cannot be positioned edge-to-edge next to each other in a battery system. An additional distancing element, namely a so-called spacer, is therefore necessary between the ceils.Frames for fixing of pouch cells or also for fuel cells are particularly established in EP 10 2 432 043 A1. Frames that exhibit channels through which cootants can flow are, furthermore established. US 2012/0040223 A1 or US 2011/0293982 A1 present these types of frames.Frames for fixing of pouch cells must guarantee sealing of their sealed seams. Over 15 and above this, it must also be ensured that a focused discharge of electrolytes takes place in the event of damage, whereby it must also be ensured that discharged, combustible gases do not come into contact with current-carrying parts.Tolerance equalisation in a so-called stack must, moreover, be a given. Vibrations 20 that impact upon a cell must be reduced. Apart from this, a cooling circuit must be attached to the frame.Besides this, there exists a requirement for improvement fixing and for mechanical buffering of electrodes. 25Vibration resistance and shock resistance of a stack should, moreover, be a given. This is especially relevant in the case of battery systems that are used in automobiles, especially in electric vehicles, hybrid vehicles, commercial vehicles, busses or lorries.30 Vibration resistance must also be a given in other mobile applications such as in trains, airplanes or work machines.Vibration resistance is required in ongoing operation. The battery casing is, as a general rule, not mounted in an elastic manner and is, therefore, not vibration resistant 35 especially in the case of passenger car applications. Components of the battery system must, therefore, exhibit high vibration resistance. Resistance to mechanical blows, typical requirements are accelerations of up to over 100 g, become noticeable primarily in cases of accidents. WO 2016/016017 3 PCT/EP2015/066388 5 It must be ensured in all cases that no leakage occurs in the cooling circuit. Should this take place, the coolant such as water, for example, can come into contact with current-carrying parts.In addition, the risk in the case of a cell opening, is that the coolant will come into 10 contact with exposed ceil components such as lithium, for example. This can have serious consequences. Release of hydrogen could also occur.The efficiency as well as homogeneity of cooling present a special challenge in view of long-term stability of the electrochemical cells. Temperatures that are too high or 15 too low could result in premature ageing of cells. Non-homogeneous temperature control could result in unbalanced ageing of cells and, therewith, in failing performance of the entire system.DISCLOSURE OF THE INVENTION 20The objective of the invention, therefore, is to specify a frame that is easy to mount in a configuration and that protects cells accommodated in the configuration in the most optimal manner during high operational efficiency.25 The abovementioned objective is met, in accordance with the invention, by characteristics of patent claim 1.To begin with, it has been established, in accordance with the invention, that coolant ducts must be integrated in the frame, whereby the coolant ducts can be present as a 30 projecting plug on one side of a first frame and extends into the other side of a second adjacent frame. These types of plugs can exhibit male parts in the form of necks and/or female parts in the form of recesses.A surprisingly stable mechanical and impermeable connection is ensured as result of 35 this - especially due to the plug that projects partially from the plane of the frame. This connection is able to, in particular, withstand vibrations and mechanical blows. WO 2016/016017 4 PCT/EP2015/066388 5 Over and above this, mechanical tensions that are caused by a change in temperature, can be counterbalanced. The configuration manufactured in this manner permits, in addition, tolerance equalisation of manufacturing tolerances. The frames are firmly connected to one another due to the extension of the neck into the respective adjacent frame and, thereby, contributes to mechanical stability of the stack. Additional 10 separate connectors can thus, as a rule, be omitted.This type of a configuration that envelops such frames, therefore, requires comparably fewer components. There is, to begin with, no necessity to provide tubes or cooling plates. A configuration can be simply manufactured and assembled quickly. It is 15 impossible for individual essential components to be forgotten during assembly. This can be put into effect by a poka-yoke principle.A frame is specified to this extent in which a configuration can be easily mounted and that protects ceils accommodated in the configuration in the most optimal manner 20 during high operational efficiency.The objective mentioned in the beginning is met in the following manner.The plug could project at least partially from the frame's plane in such a manner that 25 it can extend into a complementary plug opening of an adjacent frame. The frame, thus, exhibits plugs between itself and an adjacent frame through which coolants can flow.The plug could exhibit a circular or rectangular cross-section. Circular plugs are easy 30 to manufacture while rectangular ones result in improved frame utilisation.The plug could exhibit a male and a female part, whereby the male part is suitable for insertion into the female part of an adjacent frame and, whereby, the female part is suitable for accommodation of the male part of an adjacent frame. Each frame of a 35 stack or of a configuration can, thus, be designed identically and, at the same time, complementary to another frame. WO 2016/016017 5 PCT/EP2015/066388 5 The plug could exhibit at least one seal. This prevents a fluid from discharging from a coolant duct. A seal can be positioned on the plug. The seal could be located on the male part of the plug and/or on the female part of the plug. An elastomer, preferably EPDM, VMQ, HNBR, FKM or butyl rubber could be used as a sealing material. Thermoplastic elastomers can also be used for more simpler applications.10The plug and the seal could be designed as a single piece. The frame and the seal could then be executed as one component. This can be executed in a two-component process.15 The seal could exhibit O-rings or inserts. The frame and the seals could be assembled after manufacture, whereby the seals are designed as inserts such as O-rings.The plug could exhibit a seal that seals in a radial and/or axial manner. Sealing can thus takes place in an exclusively radial, exclusively axial or axial and radial manner. 20 Seals can be positioned at plugs and/or recesses of a plug or of a frame. The seals are preferably located to be effective in a radial and axial manner, however, at least radially effective.The plugs are preferably designed in such a manner that they exhibit at least one 25 radial sealing portion so that as high a tolerance equalisation as possible is ensured. Tolerances could emerge due to manufacture, thermal expansion or required vibration resistances.An axial sealing portion which provides additional safety can also be exhibited over 30 and above this. A multi-lipped design for a seal improves reliability.A seal could consist of several part seals, namely, have a multi-lipped design, due to which the sealing effect is increased and sealing is very secure since a part seal can be compensated by others in the case of malfunction. 35It is possible to apply the seals in a one-process step when using a seating material for cell sealing and for sealing of the plugs. Thermally conductive materials for the frame and/or sealing materials improve heat transfer and are, therefore, preferred. WO 2016/016017 6 PCT/EP2015/066388 5 Subject to the coolant, the frame could resist pressures of up to a maximum of 10 bar, preferably up to a maximum of 30 bar, particularly preferred up to a maximum of 130 bar. The frame could be designed in such a manner that it can resist pressures of up to maximum of 10 bar in case water or a water-based coolant is used. The frame could be designed in such a manner that it could withstand pressures of up to a10 maximum of 30 bar in case a fluorinated or partially fluorinated organic medium of an air conditioning unit is used. The frame could be designed in such a manner that it could withstand pressures of upto a maximum of 130 bar in case carbon dioxide is used as a coolant. Use of tubes that are inserted into the plug is particularly preferred in the case of high pressures.15Seals should withstand pressures of up to 10 bar for water-glycol based cooling circuits. Materials with lower water permeation such as EPDM, FKM, HNBR or butyl rubber, for example, are worth considering as sealing materials for parts that are in 20 contact with the cooling fluid.Seals should be capable of sealing against internal excess pressures of up to 30 bar when using partly fluorinated coolants such as R 1234yf, for example.25 Seals should be capable of sealing against internal excess pressures of up to 130 bar in case carbon dioxide is used as a coolant.Sealing materials that allow a comparably high permeation of the coolant such as silicon-based elastomers, for example, can be used in the case of a multi-lipped design 30 of a seal or in the case of lower requirement of gas permeation.A flow plate could be located in at least one plug. Flow plates that generate a laminar or turbulent current aimed at the frame and thereby improve heat transfer and cooling efficiency could be located in the plugs. The side against which flow takes place 35 preferably projects in the direction of the cell body. WO 2016/016017 7 PCT/EP2015/066388 5 Good heat transfer from coolant ducts to the frame is realised. Heat transfer between a coolant duct and a cell can be improved further by placing of flow plates in a coolant duct. This permits use of polymers, namely electrically non-conducting materials. This, in addition, permits realisation of lower rate of flow of the coolant. The diameter of the coolant ducts can thereby be reduced and/or the cooling efficiency can be 10 increased with the same diameter.A flow surface could be located in at least one plug. A flow surface onto which the current can be guided can be designed in the plugs.15 The flow surface could exhibit increased roughness.The flow surface could exhibit an increased thermal conductivity. This can be achieved by using a metallic insert, for example.20 The flow surface that is streamed against could preferably be positioned in the direction of the ceil body.Heat-conducting ribs could be located in at least one plug. Heat-conducting ribs that facilitate increased heat transfer from cells through the frame into a fluid could be 25 located in the plugs.A clip element can be designed in at least one plug. Clip elements that result in additional locking when putting together the frame could be designed in the plugs.30 A plug could be mechanically stabilised with an internally positioned brace as a result of which the plug is stabilised.A configuration could consist of at least two frames of the type described here, whereby a cell is located between the frames, whereby a male part of a first plug 35 extends into the female part of a second frame and whereby, a coolant duct for the coolant is guided through the plug. A stack or module could consist of two or several cells or frames. WO 2016/016017 8 PCT/EP2015/066388 5 A seal that is located at a male and/or female part could lie in the direct line of force or in the force shunt.At least one tube in which the coolant duct is designed can be inserted through the plug. Coolant-guiding tubes could be guided through plug openings. Use of tubes 10 that are inserted into the plugs is particularly preferred in the case of high pressures.A tube could be inserted through each opening of the plug, whereby a tolerance equalisation device is located between the tube and the inner wall of at least one opening. Coolant-guiding tubes could be inserted through openings of the plugs, 15 whereby the inner wall of the openings are exposed to the tolerance equalisation material.An external casing could be a part of a coolant duct, whereby a plug of a last frame is guided into a bore of the casing. An external casing could be incorporated in a coolant 20 duct, whereby the plug of the last frame is guided into a bore of the casing.A battery system could consist of a configuration of the type described here. A battery system could consist of a stack and at least two frames of the type described here. The frame described here serves to immobilise electrochemical energy storage cells 25 with flexible cell designs, especially pouch cells, lithium ion cells or lithium sulphur cells.The frame could be firm and exhibit a circumferential, reversible compressible cellseal. This type of cell seal can, for the most part of its peri phery, press onto the sealed30 seam of a pouch cell. This type of cell seal can be provided on both sides of a frame.The frame described here is particularly suitable for battery systems with pouch cells that have to be well and homogeneously tempered, for systems that are exposed to additional mechanical vibrations, especially mobile applications such as cars, 35 commercial vehicles, trains, airplanes, "off highway" applications such as vehicles used to move materials, construction vehicles, tractors, unmanned robots, for systems that exhibit an especially high energy throughput which results in increased cooling requirement on the one hand and in high frequency of thickness variation of cells. WO 2016/016017 9 PCT/EP2015/066388 5 Apart from the aforementioned applications, this, in addition, effects stationary systems such as batteries for net frequency stabilisation or back-up applications or battery systems with anode or cathode materials that are subject to especially high volume work during cycling.10 SHORT DESCRIPTION OF THE DRAWINGS Figure 1 presents a pouch cell with a projecting foil current conductor.Figure 2 presents two views of the frame in which bores for the coolant ducts are15 illustrated.Figure 3 presents a configuration, namely, a stack, comprising pouch cells between which frames are located.20 Figure 4 presents another view of a frame in which circular plugs that project from the plane of the frame are integrated.Figure 5 presents another view of a frame in which circular plugs that project from the plane of the frame are integrated.25Figure 6 is a sectional view of a circular plug that is integrated in the frame.Figure 7 presents a view of a frame in which approximately rectangular plugs that project from the plane of the frame are integrated. 30Figure 8 is a sectional view of an approximately rectangular plug that is integrated in the frame in a direction that is transverse to the frame.Figure 9 is a sectional view of an approximately rectangular plug that is integrated35 in the frame in a longitudinal direction of the frame.Figure 10 is a sectional view of a plug at whose male part, radial and axially acting part seals are located. WO 2016/016017 10 PCT/EP2015/0663885 Figure 11 is a sectional view of a plug at whose female part radial and axially acting part seals are located.Figure 12 is a sectional view of a double plug, whereby an axially acting part sealis located at the male part of a first plug and two radially acting part seals10 are located at the female part of a second plug.Figure 13 is a sectional view of a double plug, whereby two radially acting part seals are located at the male part of a first plug and one axially acting part seal is located at the female part of a second plug. 15Figure 14 is a sectional view of two identical plugs, whereby two radially acting part seals are located at the male part of a plug and no part seal is located at the female part of the plug.20 Figure 15 is a sectional view of two identical plugs, whereby two radially acting part seals and an axially acting part seal are located at the male part of a plug and no part seat is located at the is located at the female part of the plug.25 Figure 16 is a sectional view of a plug, whereby two radial acting part seals and an axially acting part seal are located at the male part of a plug and, whereby, axially and radially acting ribs are provided, each forming a stopper.30 Figure 17a is a sectional view of a plug, whereby two radially acting part seals and an axially acting part seal are located at the male part of a plug and, whereby, a radial inward-projecting flow plate is designed.Figure 17b is a sectional view of a plug, whereby two radially acting part seals and35 an axially acting part seal are located at the male part of a plug and,whereby, a radial inward-projecting flow plate is designed and, whereby, a surface that improves heat transfer is positioned at the flow surface. WO 2016/016017 11 PCT/EP2015/066388 5 Figure 18 is a sectional view of two identical plugs, whereby two radially acting part seals and an axially acting part seal are located at the male part of a plug and no part seal is located at the female part of the plug and, whereby, the plug is punched through by a tube.10 Figure 19 is a sectional view of two identical plugs, whereby two radially acting part seals and an axially acting part seal are located at the male part of a plug and no part seals are located at the female part of the plug, whereby the plug is punched through by a tube and, whereby, a layer is positioned between the tube and the plug as a tolerance equalisation device.15Figure 20 presents a plug, which is designed to be approximately rectangular, as illustrated in Figure 7, and in which heat-conducting ribs are located in its coolant ducts in order to improve heat transfer.20 Figure 21 presents a plug, analogous to Figure 20, in which mechanically reinforcing bracings are located apart from heat-conducting ribs.Figure 22 illustrates a frame in which the fluid-guiding coolant ducts are designedby a grid structure in the frame, whereby sealing is provided by cell seals25 that run peripherally internally and externally.EXECUTION OF THE INVENTION 30 Figure 1 presents two pouch cells, namely galvanic cells, each with a flexible sheath.This type of pouch cell exhibits a cell body 1, in which electrode-separator layers are located and a peripheral sealed seam 2 in whose region an upper and lower cover film are fused to one another. 35 A pouch cell exhibits a foil current conductor 3 that protrudes from between the cover foils and is additionally sealed with a foil. WO 2016/016017 12 PCT/EP2015/066388 5 The foil current conductors 3 can all protrude on the same side, as is illustrated in the right view of Figure 1, or, alternatively, on the opposite side as is illustrated in the left view of Figure 1.The gauge of the cell body changes during pouch cell operation, namely during 10 charging or discharge, typically by 5 - 10%.An aged pouch cell is, moreover, approximately 5% thicker than a new pouch cell. An aged and charged pouch cell is, therefore, 10% thicker than a new and uncharged pouch cell. Even higher values for gauge changes are, as a matter of fact, to be 15 expected in the case of future cell chemistry systems.Particularly anode materials, namely silicon-based materials that facilitate a higher proportional storage capacity of lithium when compared to currently used graphite carriers, experience an even higher volume work. Volume work of pouch cells is, 20 therefore, always relevant in the case of new anode materials that permit higher capacitive cells.Cooling is of special significance due to the flexibility of pouch cells. Foil current conductors 3 of pouch cells are, above all, thermally contacted at present.25This, however, has the following disadvantages: there could be a build-up of condensation at the current-carrying parts, the result of which could be a short circuit. The entire quantity of heat that is to be transported from out of the pouch cell will be restricted due to the few cross-sections of the foil current-conductor 3.30Alternative cooling concepts include contacting of the sealed seam 2 of pouch cells or even the region of the cell body. This permits achieving homogenous and efficient cooling.35 A significant challenge, thereby, is heat transfer from the point of intersection of cell body 1/sealed seam 2 and a frame and a cooling circuit This is particularly a challenge if the frame is manufactured from a synthetic material. WO 2016/016017 13 PCT/EP2015/066388 5 A configuration is described below in the case of which coolant ducts are integrated in a frame for fixing of cells.Figure 2 presents two views of a frame for fixing of pouch cells in a battery casing.10 This exhibits a firm frame body 4 and lead-through openings 5 for fixing rods.Integrated bores 6 for tubes are provided apart from this. A peripheral elastomer cell seal 7 that presses onto a sealed seam 2 of a pouch cell illustrated in Figure 1 when in the assembled state is provided. 15A recess 8 in which the cell seal 7 is not in contact with the sealed seam 2 of the cell is provided, in addition. Gas that is discharged from the cell in the event of an accident can escape through a discharge channel 9 perpendicular to the cell plane.20 This type of frame can be composed of a synthetic material such as, poiyamide, polyester, PPS, other thermoplastics or even thermosetting plastics, for example.Reinforcement using inorganic fibres such as glass or carbon, for example, is provided. 25In addition, flame-retarding properties of the material from which the frame is manufactured are advantageous. These properties can be imparted through inorganic filler materials.30 It is an advantage pertaining to safety if a frame is made from an electrically isolating material.Thermal conductivity of the material from which the frame is manufactured is, furthermore, advantageous, especially for thermally loaded cells. Thermal 35 conductivity should lie above a value of 0.5 W/(m*K).This conductivity could be offered by the following materials: WO 2016/016017 14 PCT/EP2015/066388 5 Thermally conductive synthetic materials such as Albis plastic // ALCOM PA66 910/30.1 TCE5 (heat conductivity 5 W/(m*K)), Albis plastic // ALCOM PA66 910/30.1 TCE 10 (heat conductivity 10 W/(m*K)), CoolPoly® E3607 (heat conductivity 20 W/(m*K)), BASF PA 6; B3UGM210 (heat conductivity 1 W/(m*K)) or CoolPoly® D3612 (heat conductivity 6 W7(m*K)). 10The first three materials are also electrically conductive while the fourth and fifth materials are not.The frame can also be manufactured from metal. In doing so, it is particularly 15 expedient to execute lightweight constructions.When using electrically conducting materials to manufacture frames, attention is to be paid in each case to ensure that no contacting of the foil current conductor 3 takes place as short circuits could result,20The peripheral cell seal 7 can be designed to be single-lipped or multi-lipped. A broad design of the cell seal 7 is advantageous in order to be able to equalise process variation related tolerances in the case of which thin seals press asymmetrically from both sides on to the sealed seam 2 and these would then be subject to increased25 mechanical stress.Cell seal 7 should, typically, be designed in such a manner that it seals the sealed seam 2 of the cell in such a manner that the same does not open in the case of internal excess pressures of above 1 bar at the sealed locations, 30The cell seal 7 is preferably manufactured from elastomer materials with minimal setting behaviour. It is particularly preferred to use silicon rubber-based cell seals 7 as they exhibit good properties especially regarding flame protection.35 Thermoplastic elastomers can also be used in the case of lower demands upon the cell seam 7 such as, for example, in the case of limited service of a battery or in the case of cost-driven applications. WO 2016/016017 i5 PCT/EP2015/0663885 Figure 3 presents a configuration, namely a stack, consisting of several frames with frame bodies 4, whereby a pouch cell in accordance with Figure 1 is placed between two frame bodies 4 respectively.Foil current conductors 3 project from out of frame bodies 4. A cover plate 11, which 10 closes the stack comprising cells and frame towards the outside, is located at both sides of the configuration.This cover plate 11 can also be integrated in the casing i.e. a part of the casing, for example, a wall, floor or ceiling, can take over the function of the cover plate 11. 15Lead-through openings 5 for fixing rods and integrated bores 6 for tubes are contained in the cover plate 11.An emergency drain opening 10, is, furthermore, provided through which possible 20 emissions collected in the discharge channels 9 due to a malfunction can be safely guided from out of the stack and a casing respectively.Figure 4 presents a frame 4a for fixing of cells consisting of a frame body 4 in which at least one coolant duct 6a is designed for a coolant. 25Frame 4a exhibits at least one plug 12 with which to connect to another frame, whereby the coolant duct 6a runs at least partially within the plug 12.The plug 12 protrudes, at least partially, in such a manner from frame plane 4b that it 30 can project into a complementary opening of a plug belonging to an adjacent frame.The plug 12 exhibits a circular cross-section.Coolant ducts 6a also exhibit a circular cross-section, whereby connection of pipes 35 and tubes outside of frame 4a is particularly simple to manufacture. WO 2016/016017 16 PCT/EP2015/066388 5 Figure 4 presents a frame 4 with plugs 12 for the cooling circuit. Male parts 13 of plugs 12 are inserted into female parts 14, especially recesses, when assembling adjacent frames.Figure 5 illustrates frame 4a with plugs 12 that exhibit a circular cross-section.10Figure 6 presents a plug 12 in cross-section, integrated in a frame body 4. The male part 13 of plug 12 can project into a female part of the plug of an adjacent frame. That the frame body 4 can also exhibit a female part 14, namely a recess, into which the male part 14 can be inserted, is presented here.15Plug 12 exhibits at least one seal 15. Plug 12 contains an elastomer seal 15 that bulges out. Plug 12 and seal 15 are designed as a single piece.Figure 7 illustrates a frame 4a with a non-circular plug 16. Coolant ducts 16a of plug 20 16 could also exhibit a larger breadth. Coolant ducts 16a could be oval or rectangular in cross-section. This is especially advantageous in the case of high temperature control requirements.Dividers that increase mechanical stability can additionally be positioned diagonally in 25 the coolant ducts 16a. This is particularly necessary in the case of stipulated high internal pressures, for example, when using partially fluorinated media or carbon dioxide as a coolant.Figure 8 and Figure 9 present cross-sections of an approximately rectangular plug 16. 30 The free cross-section executed here amounts to approximately 4 x 25 mm2. An elastomer seal 15 is positioned peripherally.Plug 16 is mechanically stabilised with cross beams 17 positioned internally. Cross beams 17 are affixed to improve stability. These cross beams 17 could either be 35 designed to reduce current or, alternatively, be designed as heat transfer elements. WO 2016/016017 17 PCT/EP2015/066388 5 It is, in addition, possible to manufacture the plug 16 from a material that is other than the one used for frame 4a. Plug 16 can be manufactured from metai due to which improved heat transfer in the case of even pressure loss can be achieved.It is also conceivable for the aforementioned cross beam 17 to be designed as a flow 10 element that guides a through-flowing solvent to the surface whose temperature is to be controlled or to the side of frame 4a and, in this manner, improves heat transfer. In an actual case, this would be the side of frame 4a that faces the cell, namely the inner side. It is, hereby, conceivable to use flow plates and/or flow platelets.15 Figures 10 to 19 are schematic illustrations of seals 15 in plugs 12. A plug 12 exhibits a seal 15 that seals in a radial and/or axial manner. For this purpose, a seal 15 consists of several part seals 18, 19. This type of seal 15, therefore, has a multi-lip design. Axial part seals 18 and radial part seals 19 are provided.20 Plugs 12 could also be used as stop dogs.Seals 15 of plugs 12 are located in such a manner so as to achieve an axially and radially sealing connection. Seals 15 could hereby be affixed exclusively at the male, exclusively at the female or at the male and at the female part of a plug 12. 25Figure 16 shows that a stop dog of seal 15 can be secured by affixing additional ribs 20, 21 here at the male part 13 of a plug 12. Seal 15, thus, lies in force shunt.Stop dogs are illustrated here in the axial as well as radial direction. A rib 20 is 30 effective in the axial direction, rib 21 is effective in the radial direction. Stop dogs that are each effective only in one direction are also conceivable.Figure 17a schematically illustrates that a flow plate 22 is located in at least one plug 12. The flow plate 22 is located in a coolant duct 6a, whereby the flow of the coolant 35 towards the flow surface 23 of the frame that faces the cell takes place.Apart from this, Figure 17a illustrates that a flow surface 23 is located in at least one plug 12. The flow surface 23 is affixed in the direction of a cell body 1. WO 2016/016017 18 PCT/EP2015/066388 5 Figure 17b shows that the flow surface 23 exhibits an increased roughness. The flow surface 23 exhibits an increased thermal conductivity. This is executed by using a metallic insert 24.Plates and eventual mating surfaces could be executed exclusively in the male part 10 13, exclusively in the female part 14 or respectively in one of the two parts 13, 14. These types of designs are simple to manufacture and almost without any additional cost when using a two-component manufacturing process by, for example, using inserts. It is, in addition, conceivable to use plates as structure-reinforcing elements.15 Figure 18 presents a configuration in the case of which at least one tube 25, in which the coolant duct 6a is designed, is guided through the plug 12.Placement of a separate tube 25 in openings in frame 4a is presented in Figure 18. The connection between frame 4a can, thereby, take place according to one of the 20 previously described possibilities. Complete separation of the cooling circuit and frame 4a is produced as a result of this. A high degree of security exists with regard to leakage. Increased stability is created, in addition, since tube 25 contributes to improvement of stability.25 Permeation of the coolant through seal 15 can take place. The sealing material does not, therefore, have to be resistant to the coolant. Using thermoplastic elastomers, for example, is possible. A system can also be designed for high pressures. Use of partially fluorinated coolants or even of carbon dioxide as a coolant is thus possible.30 Figure 19 presents a configuration in the case of which tube 25 is guided through one opening of a plug 12, whereby a tolerance equalising device 26 is located between the tube 25 and the inner wall 27 of at least one opening.Figure 19 illustrates placement of a separate tube 25 in openings of frames 4a. A 35 compensating layer, which ensures form-fit between tube 25 and frame 4a, is placed as a tolerance equalising device 26 between tube 25 and the inner wall 27 of an opening. Heat transfer is optimised in this manner. WO 2016/016017 19 PCT/EP2015/066388 5 The layer can exhibit a heat-conducting elastomer. In this connection, a compensating volume for the elastomer in the area between frames 4a is expedient. The layer can exhibit a heat-conducting thermoplastic elastomer. Here too, a compensating volume is expedient for the elastomer in the area between frames 4a. A heat-conducting elastomer foam could also be used in which case a separate compensating volume 10 can be omitted since the foam can be compressed in its structure.It is also conceivable to integrate an external casing with duct 6a. Linking the first or last frame 4a to the casing is conceivable.15 An additional clipping of frame 4a and/or plug 12 is possible. An additional security function is realised in this manner as adjacent frames 4a cannot be separated from one another without force effect.Figure 20 illustrates that a heat-conducting rib 28 is located, in at least one plug 16.20Figure 20 presents plug 16 that is illustrated in Figure 7 and that is approximately rectangular, in which heat-conducting ribs 28 are affixed in order to improve heat transfer in the flow channel 16a. Heat transfer between the flowing coolant and frame body 4 is improved in this manner. Heat-conducting ribs 28 could, thereby, be affixed25 at the side of frame 4a that faces the cell.Heat-conducting ribs 28 could, thereby, be made from a frame material that permits cost-effective and simple production. Heat-conducting ribs 28 could, alternatively, be made from a thermal, particularly conductive material, especially from metal.30Figure 21 presents a plug 16 that is analogous to the one presented in Figure 20, in which, apart from heat-conducting ribs 28, mechanically reinforcing cross beams 17 are affixed. These cross beams 17 have already been described with reference to Figure 9.35Figure 22 presents a frame 4a with a best possible cooling effect. Such frames 4a are connected to one another by metallic reinforcements 29. The coolant flows perpendicular through the frame plane 4b through truss-like recesses 30. WO 2016/016017 20 PCT/EP2015/066388 5 Inward-directed sealing is ensured by a peripheral inner seal 31. Externally-directed sealing is ensured by an outer seal 32 that runs in parallel peripherally.The inner seat 31 and the outer seal 32 can, furthermore, run in parallel in the area of the discharge channels 9, as illustrated in Figure 22 or, alternatively, be located 10 together in the area of an interface 33 so that the discharge channel 9 is omitted.It is also conceivable that the truss-like structure that has coolant flowing around it, protrudes section-wise from the frame plane 4b and, as analogously presented in Figure 7, projects into recesses of an adjacent frame 4a. In doing so, the protruding 15 structure has to, in turn, be sealed peripherally. The protruding structure can consist of short sections 33a or also long sections 33b of the periphery. WO 2016/016017 21 PCT/EP2015/066388 5 PATENT