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Technical field

The present invention relates to a method for dual battery provision, eg for trucks, according to the introductory portion of the attached claim 1.

The present invention also relates to a dual battery device according to the introductory portion of the attached claim 7.

The invention further relates to a vehicle according to the attached claim 15.

Prior art

Technique substantially of the kind described above is previously known. Such technique is associated with various problems, the problems being associated with the demands appearing when a dual battery unit shall be provided in a compact, an easy to clamp and fix, an insulated and an easy to connect way.

An object of the present invention is to provide a solution to these problems to provide a dual battery unit, which is compact, makes it easy to clamp and fix the batteries of the unit and to electrically insulate and connect batteries of the unit.


This and other objects are obtained by a method, a device and a vehicle as specified by the features of claims 1, 7 and 15, respectively.

Further advantages are provided by what is specified in the corresponding dependent claims.


A better understanding of the present invention will be had upon reading the following detailed description in conjunction with the attached drawings, in which like details are designated with the same designations in the different views and in which

Fig. 1 schematically shows a perspective overview of a dual battery device according to a first embodiment according to the present invention, after application of a clamping device according to the present invention,

Fig. 2 schematically shows a clamping arrangement of the device according to fig.1 , the two batteries, inter alia,being removed for clarity and the expansion of the clamping device being indicated,

Fig. 3 shows an enlarged perspective view of the clamping device according to said first embodiment,

Fig. 4 shows a clamping member according to eg fig. 3, seen against the surface to be applied against a battery and

Fig, 5 shows a block diagram over the main steps of the method according to the present invention.


In fig. 1 a dual battery device is designated by 1 , the device comprising two batteries 2, eg starting batteries for a vehicle, eg a truck, engine.

According to the present invention the batteries are provided lying on one of their sides 3 so that these sides are substantially horizontal in a device according to the present invention and the side 4, which is normally the upper side of the battery exposing the poles or terminals 5, is substantially vertical and the side 6, which is normally the battery bottom side, is also vertical, as shown in eg fig. 1.

According to preferred embodiments of the present invention the batteries are arranged with their terminals facing each other on opposing sides of a fixed insulating member 7, thus provided between the batteries.

Further, a clamping device 8, figs. 1,2 and 3, is provided, arranged to be applied onto the insulating member between the batteries 2. The clamping device is arranged to be expanded towards each battery by means of two clamping members 9, one against each battery, for forcing the batteries against opposing end stops 10 for clamping the batteries.

According to preferred embodiments, eg fig. 2, said clamping members are movable from and to each other for clamping and declamping by means of a screwing means 11 having oppositely threaded screw elements 12,13 for simultaneous movement of said clamping members in mutually opposite directions by simultaneous turning of the screw elements, each clamping member comprising a threaded bushing 11 '. Also preferred is that the screw elements are part of a common axis element 14 arranged to be turned by means of eg a nut element 15 arranged on said axis element. Expansion and compression for clamping and declamping, respectively, are indicated by arrows A in fig. 2.

Further, according to preferred embodiments, the clamping device is arranged to be positioned and fastened to the insulating member by means of a snap coupling arrangement, the insulating member and the clamping device having snap portions 16,17, respectively, arranged to co-act in a snap coupling configuration.

Also preferred is that a common box housing 18 is provided for carrying said batteries on heat insulating material support means 19, shown only for the left battery in fig. 1. Preferably, two opposing walls 20,21 of said box housing are arranged as end stops for the batteries in the clamping.

Further preferred is that the insulating member and the clamping members are made substantially of moulded plastic material for damping and low weight purposes.

According to the embodiment shown, eg in figs. 3 and 4, the clamping device comprises a central fastening piece 22 carrying the axis comprising the screw elements and being arranged to co-act with the insulating member in said snap coupling arrangement. Thus, the fastening piece comprises a groove 23 running along the substantially vertical sides 24,25 of the fastening piece and the bottom side 26 of the fastening piece, into which groove the corresponding sides of a recess 27 in the insulating member is intended to fit when the clamping member is applied onto the insulating member, so that the clamping device is guided and positioned on the insulating member. According to the embodiment shown, the snap coupling configuration comprises opposing recesses 17 in the substantially vertical sides 23,24 of the fastening piece and corresponding opposing protrusions 16 of the insulating member, indicated in fig. 2.

In fig.4 a clamping member 9 is shown in more detail, the fastening piece 22 etc being shown behind the clamping member, the clamping member being shown as eg seen from the left of the left clamping member of fig. 2. According to the embodiment shown, the clamping member has a substantially rectangular configuration to, inter alia, fit in between two battery terminals and a substantially hollow configuration filled with a pattern of supporting ribs 9' to provide strength for the clamping member.

The method as well as the function of the dual battery device according to the present invention should to a considerable and sufficient extent have been made clear from the detailed description given above. The main steps S 1 - 4 of the method according to the present invention are given in fig. 5.

Thus, the two batteries of the dual battery device according to the present invention are provided lying on the side in a mutually opposite configuration, the respective terminals facing each other on opposing sides of the insulating member between the batteries to provide a compact arrangement, the insulating member insulating the terminals of the respective battery from each other. The insulating member is also a part of the clamping arrangement for the batteries, insofar that it provides support and holder for the clamping device when the clamping device is applied between the batteries and makes the clamping procedure easy to perform.

The configuration of the clamping device also makes the clamping operation easy and reliable, the clamping members being moved simultaneously towards the batteries in a clamping action or from the batteries in a declamping action simply by turning the axis carrying the oppositely threaded screw elements in one direction or the other, using the nut means carried by the axis.

The box housing protecting the batteries and the clamping arrangement at the same time acts as opposing end stops for the batteries in the clamping procedure, preferably by opposing walls, and by the central positioning of the clamping device, wiring for electrical connection etc may be performed prior to the clamping procedure, the central insulating member preventing short circuits from appearing.

Further, the configuration of the clamping members is preferably chosen so that the clamping members act against the batteries between the battery terminals, as can be seen in eg fig. 1.Furthermore, by means of a locking device 15 ', the nut element is prevented from turning, thereby securing the clamping of the batteries. Due to the preferred formation of the clamping arrangement substantially of moulded plastic a damping action with respect to vibrations etc as well as a low weight are obtained.

The clamping device also comprises an anti rotation shaft 28 arranged to fit in a the insulating member for securing the clamping device from rotation during and after clamping.

Further, due to the co-action between the insulating member and the clamping device mounting of the clamping device is extremely easy, also due to the low weight of the moulded plastic construction of the clamping device.

Above, the present invention has been described in association with examples and preferred embodiments.

Of course, further embodiments as well as minor amendments and additions may be imagined without departing from the basic inventive idea.

Thus, according to a preferred embodiment the dual battery device with the box housing is applied under a consumer battery box of a truck, the bottom of the dual battery device still not being the lowest point of the vehicle, eg truck, body due to the low height of the battery arrangement.

Further, embodiments of the method may be imagined in which wiring for electrical connection etc is applied after the clamping procedure. Also the batteries may be applied before or after applying the clamping device.

Furthermore, the clamping members 9 need not to be rectangular but may very well have another, eg cicular, configuration.

Thus, the present invention should not be considered limited to the embodiments shown and discussed above but may be varied within the scope of the appended claims.