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1. US20190288262 - Battery system with a cell connecting unit

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[ EN ]

Claims

1. A battery system, comprising:
a cell stack comprising a plurality of battery cells, wherein at least two battery cells of the cell stack are electrically interconnected via a battery cell connector;
a battery management system comprising a printed circuit board (PCB); and
a cell connecting unit (CCU), wherein the battery cell connector is accommodated in the CCU, the CCU being fixed onto the cell stack and comprising at least one first flexible bracket that is inserted into a corresponding mounting hole of the PCB,
characterized in that the first flexible bracket of the CCU comprises a member configured to fix the PCB to the CCU after the member has been molten in a state in which the first flexible bracket was inserted into the corresponding mounting hole.
2. The battery system of claim 1, wherein the battery cell connector is realized as a bus bar that is molded into the CCU.
3. The battery system of claim 1, wherein the member of the first flexible bracket is adapted to be molten via a hot staking procedure.
4. The battery system of claim 1, wherein the CCU comprises an elastic material which is adapted to reversibly deform, allowing for the CCU to reversibly adjust to a deformation of the cell stack that is due to a charging or a discharging of at least one battery cell of the cell stack.
5. The battery system of claim 4, wherein the first flexible bracket comprises an elastic material which is adapted to reversibly deform, allowing for the first flexible bracket to reversibly compensate for an arising change in the position of the PCB relative to the CCU due to a reversible deformation of the CCU.
6. The battery system of claim 1, wherein the CCU has a substantially plate shaped body portion, wherein the first flexible bracket comprises a base part and wherein the member protrudes from the base part.
7. The battery system of claim 6, wherein the base part has the shape of a cuboid, wherein at least one edge of the cuboid extends into a direction which is perpendicular to the substantially plate shaped body portion of the CCU and wherein the member has the shape of a cylinder which protrudes from the base part into a direction that is parallel to the at least one edge of the cuboid, forming a prolongation of the cuboid shaped base part.
8. The battery system of claim 1, wherein the cell stack has a primary direction of deformation along which it deforms most during a charge and/or a discharge of at least one of the battery cells of the cell stack, wherein the stiffness of the first flexible bracket is smallest in a direction which is parallel to the primary direction of deformation.
9. The battery system of claim 7, wherein the base part of the first flexible bracket has two opposing first quadrilateral faces and two opposing second quadrilateral faces, wherein the first and second quadrilateral faces are arranged substantially perpendicularly to the substantially plate shaped body portion of the CCU, and wherein the first quadrilateral faces each have an area that is larger than the area of one of the second quadrilateral faces respectively, the second quadrilateral faces extending along a direction that is parallel to the primary direction of deformation of the cell stack.
10. The battery system of claim 9, wherein the PCB comprises at least one bonding pad and wherein the CCU comprises a second bracket, adapted to physically support the bonding pad.
11. The battery system of claim 10, wherein in a fully assembled state of the battery system, a first surface of the PCB faces towards the CCU and a second surface of the PCB faces away from the CCU, wherein the bonding pad is arranged on the second surface of the PCB and wherein the second bracket extends from the CCU towards an area (A) of the first surface directly opposing the bonding pad.
12. The battery system of claim 10, wherein in a fully assembled state of the battery system, the second bracket contacts the PCB to support the bonding pad.
13. The battery system of claim 10, wherein the first flexible bracket and the second bracket are positioned next to each other.
14. The battery system of claim 10, wherein the second bracket has the shape of a cuboid, wherein one surface of the cuboid at least in part is in contact with the PCB.
15. The battery system of claim 10, wherein the second bracket has two opposing first quadrilateral faces and two opposing second quadrilateral faces,
wherein the first and second quadrilateral faces are arranged substantially perpendicularly to the substantially plate shaped body portion of the CCU, and
wherein the first quadrilateral faces each have a surface area that is larger than the surface area of one of the second quadrilateral faces respectively, wherein the first quadrilateral faces of the second bracket extend in a plane that is parallel to the second quadrilateral faces of the first flexible bracket respectively.