Integrated busbar assembly and cylindrical battery module

Abstract

The utility model relates to the technical field of batteries, in particular to an integrated busbar assembly and a cylindrical battery module. The utility model discloses an integrated busbar assembly and a cylindrical battery module, the integrated busbar assembly comprises an upper layer insulating film, a lower layer insulating film, a busbar and an FPC acquisition board, the FPC acquisition board is arranged on the outer side of the busbar, the FPC acquisition board is electrically connected with the busbar, and the upper layer insulating film is arranged on the lower layer insulating film. The upper insulating film and the lower insulating film are respectively pasted on the upper surface and the lower surface of the busbar and the FPC acquisition board. The integrated busbar assembly provided by the utility model integrates the busbar and the FPC acquisition board, and effectively solves the problems of high production risk, low production efficiency, low yield and high cost caused by split design and step-by-step assembly of the busbar and the FPC acquisition board in the prior art and assembly and processing of the FPC acquisition board on an electrified module.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to an integrated busbar assembly and a cylindrical battery module. Background Art

[0002] The existing series-parallel bus and FPC collection board of the cylindrical battery module adopt a split design, which needs to be assembled in steps, that is, the series-parallel bus is welded first, and then the FPC collection board is welded. Not only is the process complicated and the production efficiency low, but the FPC collection board is welded on the charged battery module, which can easily cause abnormal short circuit of the battery cell and make the cylindrical battery module scrapped, with low yield, high risk and high cost. Summary of the invention

[0003] The purpose of the utility model is to provide an integrated busbar assembly to solve the above-mentioned technical problems.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an integrated busbar assembly, used for circuit connection of a cylindrical battery module, comprising an upper insulating film, a lower insulating film, a bus and an FPC acquisition board, the FPC acquisition board is arranged on the outside of the bus, the FPC acquisition board is electrically connected to the bus, and the upper insulating film and the lower insulating film are respectively attached to the upper surface and the lower surface of the bus and the FPC acquisition board.

[0005] Furthermore, the FPC collection board is arranged outside the opposite sides of the bus.

[0006] Furthermore, the upper insulating film and the lower insulating film are provided with long strip grooves in the area corresponding to the busbar and the FPC collection board.

[0007] Furthermore, the bus includes a plurality of bus units, the bus unit is provided with a positive connection area, a negative connection area, a series connection area and a parallel connection area, the positive connection area and the negative connection area are connected in series through the series connection area, the parallel connection area is used to connect multiple series connection areas in parallel, the bus unit is electrically connected to the FPC acquisition board accordingly, and the upper insulating film and the lower insulating film are provided with positive connection area windows and negative connection area windows.

[0008] Furthermore, the series connection area is provided with a fuse.

[0009] Furthermore, the fusible fuse is composed of a plurality of thin wires of equal width arranged in parallel, the width of the thin wires of equal width is not less than 0.5 mm, and the line spacing of the thin wires is not less than 0.5 mm.

[0010] Furthermore, the busbar is made of aluminum material.

[0011] Furthermore, the bus unit is electrically connected to the FPC collection board by welding, and the upper insulating film and the lower insulating film are respectively provided with welding area windows corresponding to the welding areas.

[0012] Furthermore, the upper insulating film, the lower insulating film, the busbar and the FPC collection board are respectively provided with assembly positioning holes.

[0013] The utility model also discloses a cylindrical battery module, comprising a plurality of cylindrical battery cells and the above-mentioned integrated busbar assembly, wherein the integrated busbar assembly is used for connecting the plurality of cylindrical battery cells.

[0014] Beneficial technical effects of the utility model:

[0015] The integrated busbar assembly of the utility model integrates the bus and the FPC acquisition board, which effectively solves the problems of the split design and step-by-step assembly of the existing bus and the FPC acquisition board. The FPC acquisition board needs to be assembled and processed on the live module, which leads to high production risk, low production efficiency, low yield and high cost. The FPC acquisition board is arranged on the outside of the bus to avoid affecting the welding of the bus and the battery cell electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic structural diagram of an integrated busbar assembly according to a specific embodiment of the utility model;

[0018] Figure 2 It is a schematic structural diagram of an upper insulating film in a specific embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the busbar and FPC acquisition board of a specific embodiment of the utility model;

[0020] Figure 4 It is a schematic structural diagram of a lower insulating film of a specific embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of a bus unit of a specific embodiment of the utility model;

[0022] Figure 6 for Figure 5 Sectional view in the AA direction;

[0023] Figure 7It is a structural schematic diagram of a cylindrical battery module according to a specific embodiment of the utility model. DETAILED DESCRIPTION

[0024] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1-7 As shown, an integrated busbar assembly 100 is used for circuit connection of a cylindrical battery module 200, including an upper insulating film 1, a lower insulating film 2, a bus 3 and an FPC acquisition board 4, wherein the FPC acquisition board 4 is arranged on the outside of the bus 3, the FPC acquisition board 4 is electrically connected to the bus 3, the upper insulating film 1 and the lower insulating film 2 are respectively attached to the upper surface and the lower surface of the bus 3 and the FPC acquisition board 4, that is, the bus 3 and the FPC acquisition board 4 are sandwiched between the upper insulating film 1 and the lower insulating film 2.

[0027] In this specific embodiment, the number of FPC acquisition boards 4 is 2, and the two FPC acquisition boards 4 are respectively arranged on the opposite sides of the bus 3. The structure is more reasonable and simple, with good symmetry, easy to implement, and avoids affecting the welding of the bus 3 and the electrodes of the cylindrical battery cell 201. However, it is not limited to this. In some embodiments, the number and position of the FPC acquisition boards 4 can be set according to actual conditions.

[0028] The FPC acquisition board 4 can be made of a flexible substrate such as polyimide, polyester film, etc., and is provided with an acquisition circuit layer. The more specific structure can refer to the FPC acquisition board of the existing battery module, which will not be repeated here.

[0029] The bus 3 includes a plurality of bus units 31, and the specific number of the bus units 31 can be set according to the number of cylindrical cells 201 of the cylindrical battery module 200, the series-parallel structure of the cylindrical cells 201, and the size of the bus units 31. Of course, in some embodiments, the number of the bus units 31 can also be one.

[0030] The busbar unit 31 is provided with a positive electrode connection area 311, a negative electrode connection area 312, a series connection area 313 and a parallel connection area 314. The positive electrode connection area 311 and the negative electrode connection area 312 are respectively used to be welded and fixed to the positive and negative electrodes of the cylindrical battery cell 201 for electrical connection. The positive electrode connection area 311 and the negative electrode connection area 312 are connected in series through the series connection area 313, and the parallel connection area 314 is used to connect multiple series connection areas 313 in parallel.

[0031] In this specific embodiment, the negative electrode connection area 312 is bent and sunken, such as Figure 6 As shown, the sinking depth is consistent with the height difference between the positive and negative electrodes of the cylindrical battery cell 201 , and is easy to be welded and fixed with the positive and negative electrodes of the cylindrical battery cell 201 .

[0032] Specifically, in this embodiment, each busbar unit 31 is provided with four positive electrode connection areas 311 , four negative electrode connection areas 312 and four series connection areas 313 , but the present invention is not limited thereto.

[0033] Furthermore, in this embodiment, the series connection area 313 is provided with a fuse 3131. When the cylindrical battery cell 201 is abnormally short-circuited, the fuse 3131 can be quickly blown to avoid heat diffusion, improve safety and reliability, and the fuse 3131 is set in the series connection area 313 so that the fuses 3131 of the bus unit 31 are evenly distributed to avoid uneven deformation of the product due to stress.

[0034] Preferably, the blown fuse 3131 is disposed close to the positive electrode connection region 311, which has a more reasonable structure and is easier to implement, but is not limited thereto.

[0035] In this specific embodiment, the blown fuse 3131 is composed of a plurality of thin wires of equal width connected in parallel, thereby ensuring the stability of the bus unit 31 .

[0036] The fuse 3131 is formed by punching on the series connection area 313 through a mold, and the line width of the equal-width thin line is not less than 0.5 mm, and the line spacing of the wide and thin lines is not less than 0.5 mm, so as to reduce the processing difficulty of the mold, but it is not limited to this.

[0037] In this specific embodiment, the bus unit 31 is made of aluminum material, more specifically 1060 aluminum material, which has good conductivity and low cost, but is not limited thereto. In some embodiments, the bus unit 31 may also be made of other conductive metal materials, such as copper, nickel, etc. More specifically, in this embodiment, the bus unit 31 is formed by integrally processing aluminum material, which has a simple structure and is easy to implement.

[0038] In this specific embodiment, the bus unit 31 is electrically connected to the FPC acquisition board 4 by welding to improve the electrical connection performance. Accordingly, a welding pad 41 is provided on the FPC acquisition board 4, and the FPC acquisition board 4 is welded to the bus unit 31 through the welding pad 41. The upper insulating film 1 and the lower insulating film 2 are respectively provided with welding area windows 11 and 21 corresponding to the welding area, so as to weld the welding pad 41 to the bus unit 31 through the nickel sheet.

[0039] The upper insulating film 1 is provided with a positive connection area window 12 and a negative connection area window 13, and the lower insulating film 2 is provided with a positive connection area window 22 and a negative connection area window 23, so as to be used for subsequent welding and fixing of the positive connection area 311 and the negative connection area 312 with the positive and negative electrodes of the cylindrical battery cell 201 for electrical connection.

[0040] Furthermore, in this specific embodiment, the upper insulating film 1 and the lower insulating film 2 are provided with long strip grooves 14 and 24 in the area corresponding to the bus 3 and the FPC collecting plate 4, so as to facilitate the folding of the FPC collecting plate 4 toward the side of the cylindrical battery module 200, thereby making the spatial layout more compact.

[0041] In this specific embodiment, the upper insulating film 1, the lower insulating film 2, the bus 3 and the FPC acquisition board 4 are respectively provided with a plurality of assembly positioning holes 15, 25, 32 and 42, which improves the assembly accuracy of the upper insulating film 1, the lower insulating film 2, the bus 3 and the FPC acquisition board 4.

[0042] The upper insulating film 1 and the lower insulating film 2 can be made of insulating materials such as polyimide and polyethylene.

[0043] In this specific embodiment, the upper insulating film 1, the lower insulating film 2, the busbar 3 and the FPC collecting plate 4 are fixed together by hot pressing with a pressing mold, which is easy to process and low in cost, but is not limited to this.

[0044] During assembly, the integrated busbar assembly 100 is placed above the positive and negative electrodes of the cylindrical battery cell 201 of the cylindrical battery module 200, so that the positive electrode connection area 311 and the negative electrode connection area 312 of the integrated busbar assembly 100 are respectively facing the positive and negative electrodes of the cylindrical battery cell 201, and then welded and fixed. Then, the parts 101 including the FPC collection board 4 on both sides are bent to the side of the cylindrical battery module 200 through the long strip slots 14 and 24, as shown in FIG. Figure 7 As shown, the circuit connection assembly of the cylindrical battery module 200 is completed, which effectively solves the existing split design and step-by-step assembly of the bus and the FPC acquisition board. The FPC acquisition board needs to be assembled and processed on the live module, resulting in high production risk, low production efficiency, low yield and high cost.

[0045] The utility model also discloses a cylindrical battery module 200, such as Figure 7As shown, it includes multiple cylindrical battery cells 201 and the above-mentioned integrated busbar assembly 100. The integrated busbar assembly 100 is used to connect the multiple cylindrical battery cells 201. For more specific connection structure, please refer to the above description, which will not be repeated here.

[0046] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An integrated busbar assembly for circuit connection of cylindrical battery modules, characterized in that: It includes an upper insulating film, a lower insulating film, a bus and an FPC acquisition board. The FPC acquisition board is arranged on the outside of the bus. The FPC acquisition board is electrically connected to the bus. The upper insulating film and the lower insulating film are respectively attached to the upper surface and the lower surface of the bus and the FPC acquisition board.

2. The integrated busbar assembly according to claim 1, characterized in that: The FPC collection board is arranged outside two opposite sides of the bus bar.

3. The integrated busbar assembly according to claim 2, characterized in that: The upper insulating film and the lower insulating film are provided with long strip grooves in the area corresponding to the busbar and the FPC collection board.

4. The integrated busbar assembly according to any one of claims 1 to 3, characterized in that: The bus includes a plurality of bus units, each bus unit is provided with a positive connection area, a negative connection area, a series connection area and a parallel connection area, the positive connection area and the negative connection area are connected in series through the series connection area, the parallel connection area is used to connect a plurality of series connection areas in parallel, the bus unit is electrically connected to the FPC acquisition board accordingly, and the upper insulating film and the lower insulating film are provided with a positive connection area window and a negative connection area window.

5. The integrated busbar assembly according to claim 4, characterized in that: The series connection area is provided with a fuse.

6. The integrated busbar assembly according to claim 5, characterized in that: The fusible fuse is composed of a plurality of thin wires of equal width arranged in parallel, the line width of the thin wires of equal width is not less than 0.5 mm, and the line spacing of the thin wires is not less than 0.5 mm.

7. The integrated busbar assembly according to claim 4, characterized in that: The busbar is made of aluminum material.

8. The integrated busbar assembly according to claim 4, characterized in that: The busbar unit is electrically connected to the FPC collection board by welding, and the upper insulating film and the lower insulating film are respectively provided with welding area windows corresponding to the welding areas.

9. The integrated busbar assembly according to claim 1, characterized in that: The upper insulating film, the lower insulating film, the busbar and the FPC collecting plate are respectively provided with assembly positioning holes.

10. A cylindrical battery module, characterized in that: It comprises a plurality of cylindrical battery cells and an integrated busbar assembly as claimed in any one of claims 1 to 9, wherein the integrated busbar assembly is used to connect the plurality of cylindrical battery cells.

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