Flexible circuit board assembly for acquiring voltage of battery module and battery module

Abstract

A flexible circuit board assembly used for battery module voltage acquisition comprises a busbar, a conducting strip, a flexible circuit board and bolts, the busbar is used for connecting cells of a battery module in series and / or in parallel, threaded holes are formed in the busbar, one end of the conducting strip is connected with the flexible circuit board, and connecting holes are formed in the other end of the conducting strip. And the bolts pass through the connecting holes and are connected to the threaded holes so as to fix the conducting strips and realize the electric connection of the busbar and the conducting strips at the same time. Compared with the prior art, the flexible circuit board assembly is convenient to connect and high in efficiency, compared with welding, the bolt connection mode between the busbar and the conducting strip can reduce the scrap problem, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible circuit board assemblies, and particularly relates to a flexible circuit board assembly for voltage acquisition of a battery module and a battery module using the flexible circuit board assembly. Background Art

[0002] Existing power and energy storage batteries generally are provided with flexible circuit board assemblies to detect their voltages and ensure their safe use. The flexible circuit board assembly includes a conductive member for connecting in series or in parallel a plurality of battery cells, a flexible circuit board, and a conductive sheet connected to the flexible circuit board. The free end of the conductive sheet is connected to the conductive member. However, the existing connection sheet and the conductive member are generally connected by welding. For example, in the flexible circuit board assembly provided in the authorized announcement number CN220569918U, laser welding is used for connection. This connection method has the following defects: First, if the welding causes the parts to be scrapped, the entire flexible circuit board assembly will be scrapped, increasing the cost; Second, before production, the laser welding machine often needs to adjust parameters to ensure stable production, which affects production efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a flexible circuit board assembly for voltage acquisition of a battery module.

[0004] To achieve the above purpose, the utility model discloses a flexible circuit board assembly for voltage acquisition of a battery module, which includes a bus bar, a conductive sheet, a flexible circuit board, and a bolt. The bus bar is used for connecting in series and / or in parallel the battery cells of the battery module. The bus bar is provided with a threaded hole. One end of the conductive sheet is connected to the flexible circuit board, and the other end is provided with a connection hole. The bolt passes through the connection hole and is connected to the threaded hole to fix the conductive sheet and simultaneously realize the electrical connection between the bus bar and the conductive sheet.

[0005] Preferably, it further includes an insulating bracket. The insulating bracket is arranged between the bus bar and the flexible circuit board. The insulating bracket includes a bearing area and connection areas on both sides opposite to each other at the position of the bearing area. The flexible circuit board is arranged on the bearing area. A first avoidance hole is provided at a position on the connection area opposite to the position of the threaded hole. The bolt passes through the connection hole and the avoidance hole and is connected to the threaded hole.

[0006] Preferably, the flexible circuit board is fixed on the bearing area.

[0007] Preferably, there is at least one bus bar. Each bus bar includes a connection part connected to the battery cells of the battery module and a buffer part connecting between adjacent two connection parts. The buffer part arches towards the insulating bracket side.

[0008] Preferably, a second avoidance hole is provided at a position on the insulating bracket opposite to the position of the buffer portion, and the buffer portion extends into the second avoidance hole.

[0009] Preferably, heat dissipation holes are provided on the insulating bracket.

[0010] Preferably, the bolt presses down the conductive sheet, and the conductive sheet contacts the bus bar.

[0011] The present utility model also provides a battery module using the above flexible circuit board assembly.

[0012] A battery module includes a plurality of battery cells and a flexible circuit board assembly connecting the plurality of battery cells, and the flexible circuit board assembly is the flexible circuit board assembly described in any one of the above.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The electrical connection between the bus bar, the conductive sheet, and the flexible circuit board is realized by connecting and fixing the conductive sheet with bolts. Compared with welding, this connection method is not easy to damage the components of the flexible circuit board assembly, and the damage rate is low, avoiding the problems of high damage rate and high cost caused by using the welding connection method.

[0014] By using bolt connection, there is no need to adjust parameters like welding before connection, and the connection can be directly carried out, with high connection efficiency. Description of the Drawings

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a flexible circuit board assembly for voltage acquisition of a battery module in Embodiment 1;

[0016] Figure 2 For Figure 1 The three-dimensional structural schematic diagram of the flexible circuit board assembly in;

[0017] Bus bar 1; Threaded hole 11; Connection portion 12; Buffer portion 13;

[0018] Conductive sheet 2; Connection hole 21;

[0019] Flexible circuit board 3;

[0020] Bolt 4;

[0021] Insulating bracket 5; Loading area 51; Connection area 52; First avoidance hole 53; Second avoidance hole 54. Detailed Embodiment

[0022] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0023] Embodiment 1

[0024] A flexible circuit board assembly for battery module voltage acquisition, see Figure 1 - Figure 2 , including a bus bar 1, a conductive sheet 2, a flexible circuit board 3 and a bolt 4. The bus bar 1 is used to connect the battery cells of the battery module in series and / or in parallel, and the specific connection method can be set according to actual needs. A threaded hole 11 is provided on the bus bar 1. One end of the conductive sheet 2 is connected to the flexible circuit board 3, preferably by welding. The other end is provided with a connection hole 21. The bolt 4 passes through the connection hole 21 and is connected to the threaded hole 11 to fix the conductive sheet 2 and at the same time realize the electrical connection between the bus bar 1 and the conductive sheet 2. The above flexible circuit board 3 assembly realizes the electrical connection between the bus bar 1, the conductive sheet 2 and the flexible circuit board 3 by connecting and fixing the conductive sheet 2 with the bolt 4. Compared with welding, this connection method is not easy to damage the components of the flexible circuit board 3 assembly, and the damage rate is low, avoiding the problems of high damage rate and high cost caused by using the welding connection method. By using the bolt 4 connection, there is no need to adjust parameters like welding before connection, and the connection can be directly carried out, with high connection efficiency.

[0025] In this embodiment, further, an insulating bracket 5 is further included. The insulating bracket 5 is arranged between the bus bar 1 and the flexible circuit board 3. Setting the insulating bracket 5 achieves the effect of insulation between the bus bar 1 and the flexible circuit board 3. The insulating bracket 5 includes a bearing area 51 and connection areas 52 located on both sides of the bearing area 51 opposite to each other. The flexible circuit board 3 is arranged on the bearing area 51. Preferably, the flexible circuit board 3 is fixed on the bearing area 51, which can improve the connection reliability of the flexible circuit board 3, avoid loosening and poor contact, and is beneficial to improving the use safety of the battery module. A first avoidance hole 53 is provided on the connection area 52 at a position opposite to the threaded hole 11. The bolt 4 passes through the connection hole 21 and the first avoidance hole 53 and is connected to the threaded hole 11.

[0026] In this embodiment, there is at least one bus bar 1. Preferably, a plurality of bus bars 1 are provided, and the specific number can be set according to actual needs. Each bus bar 1 includes a connection part 12 connected to the battery cells of the battery module and a buffer part 13 connecting between two adjacent connection parts 12. The buffer part 13 arches towards the insulating bracket 5 side and has a certain deformation ability. The battery cells of the battery module will expand during use. When the battery cells expand, the buffer part 13 can adaptively deform under its own stress, so that the connection part 12 is not pulled, improving the connection reliability between the connection part 12 (bus bar 1) and the battery cells and the use safety of the battery module.

[0027] To avoid interference between the buffer portion 13 and the insulating bracket 5, a second avoidance hole 51 is provided at a position on the insulating bracket 5 that is opposite to the position of the buffer portion 13, and the buffer portion 13 extends into the second avoidance hole 51. The provision of the second avoidance hole 51 not only solves the interference problem between the buffer portion 13 and the insulating bracket 5, but also has a certain heat dissipation effect. During the use of the battery module, its heat is transferred to the bus bar 1, and the bus bar 1 dissipates heat outward through the buffer portion 13, improving the heat dissipation effect of the battery module.

[0028] To further improve the heat dissipation effect, heat dissipation holes are provided on the insulating bracket 5. Among them, the heat dissipation holes are the second avoidance holes 51 that do not have an avoidance function.

[0029] In this embodiment, the bolt 4 passes through the first avoidance hole 53 and is threadedly connected to the threaded hole 11. In the tightened state, the bolt 4 presses down on the conductive sheet, and the conductive sheet contacts the bus bar 1, which not only ensures the connection effect of the conductive sheet but also ensures the electrical connection effect between the conductive sheet and the bus bar 1.

[0030] Embodiment 2

[0031] A battery module includes a plurality of battery cells and a flexible circuit board assembly connecting the plurality of battery cells. The flexible circuit board 3 assembly is the flexible circuit board 3 assembly described in Embodiment 1.

[0032] Among them, the bus bar 1 and the battery cell are also connected by bolts 4.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A flexible circuit board assembly for battery module voltage collection, characterized in that: It includes a bus, a conductive sheet, a flexible circuit board and bolts. The bus is used for connecting the cells of the battery module in series and / or in parallel. The bus is provided with a threaded hole. One end of the conductive sheet is connected to the flexible circuit board, and the other end is provided with a connecting hole. The bolt passes through the connecting hole and is connected to the threaded hole to fix the conductive sheet and realize the electrical connection between the bus and the conductive sheet at the same time.

2. The flexible circuit board assembly for battery module voltage collection according to claim 1, characterized in that: It also includes an insulating bracket, which is arranged between the bus and the flexible circuit board. The insulating bracket includes a bearing area and connecting areas on both sides opposite to the bearing area. The flexible circuit board is arranged on the bearing area. The connecting area is provided with a first avoidance hole at a position opposite to the threaded hole. The bolt passes through the connecting hole and the avoidance hole is connected to the threaded hole.

3. The flexible circuit board assembly for battery module voltage collection according to claim 2, characterized in that: The flexible circuit board is fixed on the bearing area.

4. The flexible circuit board assembly for battery module voltage collection according to claim 2, characterized in that: There is at least one busbar, and each busbar comprises a connecting portion connected to the battery cell of the battery module and a buffer portion connecting two adjacent connecting portions, wherein the buffer portion is arched toward one side of the insulating bracket.

5. The flexible circuit board assembly for battery module voltage collection according to claim 4, characterized in that: A second avoidance hole is provided on the insulating bracket at a position opposite to the buffer portion, and the buffer portion extends into the second avoidance hole.

6. The flexible circuit board assembly for battery module voltage collection according to claim 2, characterized in that: The insulating bracket is provided with heat dissipation holes.

7. The flexible circuit board assembly for battery module voltage collection according to claim 1, characterized in that: The bolt presses down the conductive sheet, and the conductive sheet contacts the bus bar.

8. A battery module, comprising a plurality of battery cells and a flexible circuit board assembly connecting the plurality of battery cells, characterized in that: The flexible circuit board assembly is the flexible circuit board assembly according to any one of claims 1 to 7.

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