Power battery integrated busbar

Abstract

The utility model discloses a power battery integrated busbar which comprises an upper layer and a lower layer, a middle layer is arranged between the upper layer and the lower layer, the upper layer and the lower layer are pressed together in a hot pressing mode, and meanwhile the middle layer is pressed and covered in the upper layer and the lower layer. According to the utility model, the current transmission conductor of the middle layer and the conductive metal circuit are welded together and then are pressed between the upper insulating layer and the lower insulating layer at one time, so that compared with the existing CCS product, the high cost caused by the use of an FPC (Flexible Printed Circuit) finished product is saved, the production cost of the CCS product is greatly reduced, and the competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an integrated busbar of a power battery. Background Art

[0002] Based on the rapid expansion of the current new energy vehicle market, lithium batteries are the most mainstream power supply solution, and their production scale and technology have also progressed accordingly. The power batteries conventionally used in new energy passenger cars and commercial vehicles are usually composed of multiple power battery modules connected in series, and the realization of this series function mainly relies on the integrated busbar design. The integrated busbar (CCS), also known as the battery cover assembly, is widely used in power battery modules, large storage air-cooled battery modules, large storage liquid-cooled battery modules and household energy storage battery modules. It provides battery temperature sampling, battery cell voltage sampling functions and realizes high-voltage series and parallel connection of battery cells. It provides temperature and voltage to the BMS system through PCB, FPC and connector components, and is part of the BMS system.

[0003] Usually, the pressed CCS is composed of the current transmission busbar and the upper and lower insulating materials of the signal acquisition circuit. Among them, the signal acquisition circuit usually adopts the cable assembly harness, FPC flexible circuit board or FFC cable (flexible flat cable). The most common method is the FPC method, but due to the complex manufacturing process of FPC and the high material cost of the insulating material PI, the procurement cost of FPC accounts for a high proportion in the entire CCS. The total cost of the entire CCS product will be restricted by the FPC procurement cost and lose its price advantage. Therefore, it is of great significance to reduce the dependence on FPC as much as possible to reduce the production cost of CCS products and improve product competitiveness. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a low-cost integrated power battery busbar.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: a power battery integrated busbar, including an upper layer and a lower layer, an intermediate layer is arranged between the upper layer and the lower layer, the upper layer and the lower layer are pressed together by hot pressing, and the intermediate layer is pressed therein.

[0006] Preferably, the intermediate layer comprises a current transmission conductor and a conductive metal line, and the current transmission conductor and the conductive metal line are connected together by welding.

[0007] Preferably, a metal strap is provided on the conductive metal circuit, and the conductive metal circuit is welded to the current transmission conductor via the metal strap.

[0008] Preferably, the upper layer and the lower layer are both insulating layers, and the insulating layers are at least PI insulating films or PET insulating films.

[0009] The beneficial effects of the utility model are:

[0010] The utility model discloses a power battery integrated busbar, which has a simpler structure and a faster assembly method. The busbar only needs to be composed of welding the current transmission conductor and the conductive metal line together, and the upper and lower insulating films press the current transmission conductor and the conductive metal line into one. Compared with the existing CCS products, the high cost of using FPC flexible circuit board products is omitted, the production cost of CCS products is greatly reduced, the competitiveness of products is improved, and the processing technology of CCS products is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the exploded structure of a power battery integrated busbar of the utility model;

[0012] Figure 2 This is a schematic diagram of the combined structure of a power battery integrated busbar of the utility model;

[0013] Figure 3 This is a schematic structural diagram of a power battery integrated busbar from another angle of the utility model;

[0014] Figure 4 This is a schematic diagram of the intermediate layer structure of a power battery integrated busbar of the utility model;

[0015] The markings of the components in the accompanying drawings are as follows:

[0016] 1. Upper layer; 2. Lower layer; 3. Middle layer; 31. Current transmission conductor; 32. Conductive metal line; 33. Metal strap. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] Example:

[0019] This embodiment introduces a schematic diagram of the structure of a power battery integrated busbar. Figure 1 , 2 As shown, Figure 1 This is a schematic diagram of the exploded structure of a power battery integrated busbar of the utility model. Figure 2 The utility model is a schematic diagram of the combined structure of a power battery integrated busbar.

[0020] A power battery integrated busbar comprises an upper layer 1 and a lower layer 2, wherein an intermediate layer 3 is arranged between the upper layer 1 and the lower layer 2, wherein the upper layer 1 and the lower layer 2 are pressed together by hot pressing, and the intermediate layer 3 is pressed therein at the same time, so that the upper layer, the intermediate layer and the lower layer become one.

[0021] Combined with Figure 3 , 4 As shown, Figure 3 This is a schematic diagram of the structure of a power battery integrated busbar from another angle of the utility model. Figure 4 The middle layer 3 of the utility model is a schematic diagram of the structure of the middle layer of the integrated busbar of a power battery. The middle layer 3 includes a current transmission conductor 31 and a conductive metal line 32, and the current transmission conductor 31 and the conductive metal line 32 are connected together by welding.

[0022] Furthermore, a metal strap 33 is provided on the conductive metal circuit 32 , and the metal strap 33 and the conductive metal circuit 32 are integrated, and the conductive metal circuit 32 is welded to the current transmission conductor 31 through the metal strap 33 .

[0023] In this embodiment, compared with the existing products, in which FPC flexible circuit boards are used in the busbar as the signal acquisition circuit of CCS, the finished FPC flexible circuit boards are not used in this embodiment, and the conductive metal circuits are directly welded to the current transmission conductors, which greatly saves the production cost of CCS products, simplifies the processing flow of the busbar, and makes assembly faster.

[0024] The upper layer 1 and the lower layer 2 are both insulating layers, and the insulating layer can be at least PI insulating film or PET insulating film. In this embodiment, the insulating layer is PI film, which is the most high-temperature resistant polymer material. PI material has good performance in processing performance, mechanical performance, insulation performance, flame retardancy, chemical corrosion resistance, radiation resistance and many other aspects.

[0025] In this embodiment, by directly pressing the welded conductive metal lines and the current transmission conductors between the upper and lower insulating layers at one time, the high cost of using FPC flexible circuit board finished products is eliminated, the production cost of CCS products is greatly reduced, the competitiveness of products is improved, and the processing flow of CCS products is simplified.

[0026] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power battery integrated busbar, characterized in that: The integrated busbar comprises an upper layer (1) and a lower layer (2), an intermediate layer (3) is arranged between the upper layer (1) and the lower layer (2), the upper layer (1) and the lower layer (2) are pressed together by hot pressing, and the intermediate layer (3) is pressed therebetween; The intermediate layer (3) comprises a current transmission conductor (31) and a conductive metal line (32), and the current transmission conductor (31) and the conductive metal line (32) are connected together by welding.

2. A power battery integrated busbar according to claim 1, characterized in that: A metal strap (33) is provided on the conductive metal circuit (32), and the conductive metal circuit (32) is welded to the current transmission conductor (31) via the metal strap (33).

3. The power battery integrated busbar according to claim 1, characterized in that: The upper layer (1) and the lower layer (2) are both insulating layers, and the insulating layers are at least PI insulating films or PET insulating films.

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