Battery module busbar

Abstract

The utility model discloses a battery module busbar, which comprises a middle part (13), a middle upwarp part (12) arranged at one end of the middle part (13), and a nut (15) and a round hole (16) arranged on the surface of the battery module busbar (1), can effectively avoid secondary cutting of the busbar and polishing of a battery core pole, and effectively improves the efficiency and the safety of gradient utilization of a power battery pack.

Description

Technical Field

[0001] The present invention relates to the field of new energy power battery packs, and mainly relates to a busbar for a battery module. Background Art

[0002] With the development of the new energy electric vehicle market, the market inventory of power battery packs has gradually increased.

[0003] Subsequently, there comes the problem of the cascade utilization of retired power battery packs. Currently, the disassembly and reuse of power battery packs generally only reach the module level. If there is one or more single cells damaged in the module, it is rather difficult to disassemble the module. Therefore, the conventional treatment method for such a module is only to scrap it and it cannot be used for cascade utilization. As a result, the cascade utilization of battery modules is insufficient.

[0004] In the prior art, battery modules are formed by laser welding. The treatment method of forced cascade utilization is difficult and dangerous. Generally, the welded busbar on the cell pole is ground off by a machine, and the grinding process is extremely likely to damage the cells.

[0005] The above problems seriously affect the cascade utilization of power battery packs, especially the low efficiency of the cascade utilization of welded modules, thus affecting the entire cascade utilization market of power battery packs.

[0006] CN117276814A - Busbar Assembly, Battery Module and Battery Pack discloses a busbar assembly, a battery module and a battery pack. The busbar assembly includes: at least two intermediate busbar units, each intermediate busbar unit includes an intermediate conductive body for electrically connecting the poles of adjacent cells, and the intermediate conductive body is provided with an intermediate flow channel section for the flow of an insulating heat exchange medium; a connection unit including an insulating body provided with a connection flow channel section for the flow of an insulating heat exchange medium; the connection unit is at least connected between adjacent intermediate busbar units so that all the intermediate flow channel sections are connected end to end in sequence. It also cannot solve the above technical problems. Utility Model Content

[0007] The technical problem to be solved by the present utility model is to provide a busbar for a battery module, which can effectively avoid secondary cutting of the busbar and grinding of the cell poles during the cascade utilization process, and effectively improve the operability and safety of the cascade utilization.

[0008] To solve the above technical problems, the technical solution adopted by the present utility model is: a busbar for a battery module, having: a middle component, a middle raised component provided at one end of the middle component, and nuts and round holes provided on the surface of the busbar for the battery module.

[0009] The busbar for the battery module is a cuboid, and its thickness is less than its length and width.

[0010] The middle component is connected to the busbars on both sides by a groove transition area, and the depth of the groove transition area is less than the thickness of the busbar of the battery module.

[0011] One end of the middle component extends with a middle upturned part, and the middle upturned part upturns upward in a quarter of a semi-circular arc, and the upward height of the middle upturned part is less than or equal to four times the thickness of the busbar of the battery module.

[0012] There are rectangular through holes in the groove transition area, and the rectangular through holes have the same direction as the groove transition area and penetrate the groove transition area in sequence, and the intervals between adjacent rectangular through holes are the same.

[0013] The middle component and the groove transition area are made of composite conductive materials.

[0014] The surface treatment of the busbar of the battery module is nickel plating or tin plating.

[0015] One of the above technical solutions has the following advantages or beneficial effects. During the designed life cycle, using laser welding, the busbars of the battery module can ensure effective electrical connection. During the secondary utilization process, it can effectively avoid secondary cutting of the busbars and grinding of the electrode posts of the battery cells, effectively improving the operability and safety of secondary utilization. At the same time, it also improves the quality of the electrical connection for the secondary utilization of the power battery pack, improves the consistency of the secondary utilization products, can be replicated in batches, and has strong operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front perspective view of a busbar of a battery module proposed by the present invention;

[0017] Figure 2 is Figure 1 a rear perspective view of a busbar of a battery module as shown;

[0018] Figure 3 is Figure 1 a top view of a busbar of a battery module as shown;

[0019] Figure 4 is Figure 1 a side view of a busbar of a battery module as shown;

[0020] Figure 5 is a perspective view of a busbar of a battery module installed on a module;

[0021] Figure 6 is a top view of a busbar of a battery module installed on a module;

[0022] Figure 7 is a perspective view of a busbar of a battery module with the middle part removed;

[0023] Figure 8 It is a top view of a battery module busbar with the middle part removed;

[0024] Figure 9 It is a three-dimensional view of a battery module busbar with the middle part removed and installed on the module;

[0025] Figure 10 It is a top view of a battery module busbar with the middle part removed and installed on the module;

[0026] Figure 11 It is a three-dimensional view of a strip busbar;

[0027] Figure 12 It is a three-dimensional view of a strip busbar reinstalled after removing the middle part of a battery module busbar installed on the module;

[0028] Figure 13 It is a top view of a strip busbar reinstalled after removing the middle part of a battery module busbar installed on the module;

[0029] The markings in the above figures are as follows: 1. Battery module busbar, 12. Middle part upturned part, 13. Middle part component, 14. Rectangular through hole, 15. Nut, 16. Round hole, 17. Groove transition area, 2. Battery cell, 21. Terminal post, 3. Strip busbar, 31. Round hole, 4. Bolt. Specific implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] See Figures 1 to 13 , a battery module busbar includes a middle part component 13, a middle part upturned part 12 provided at one end of the middle part component 13, and a nut 15 and a round hole 16 provided on the surface of the battery module busbar 1.

[0032] The battery module busbar 1 is a cuboid, and its thickness is much smaller than its length and width. The middle part component 13 is connected to the busbars on both sides by a groove transition area 17, and the depth of the groove transition area 17 is smaller than the thickness of the battery module busbar 1.

[0033] One end of the middle part component 13 extends with a middle part upturned part 12, and the middle part upturned part 12 upturns upward in a quarter of a semi-circle, and the upward height of the middle part upturned part 12 is less than or equal to four times the thickness of the battery module busbar 1.

[0034] There are rectangular through holes 14 in the groove transition area 17 . The rectangular through holes 14 have the same direction as the groove transition area 17 and penetrate the groove transition area 17 in sequence. The rectangular through holes 14 are spaced at the same intervals.

[0035] In a specific embodiment, the battery module bus 1 is provided with two circular holes 16, which correspond to the center points of the two battery cell poles to be welded, and can be used as positioning observation points during laser welding. After laser welding, the center point of the battery cell can be checked in combination with the circular hole 16 to determine whether the bus after laser welding is displaced and whether the laser welding process needs to be adjusted accordingly.

[0036] In a specific embodiment, the battery module busbar 1 has a thickness of 3 mm and a width of 40 mm. The groove transition zone 17 has a depth of 1 mm. The minimum cross-sectional area of ​​the groove transition zone 17 is calculated to be about 40 mm2, which meets the PACK overcurrent requirement. When used specifically, within the design life cycle, laser welding is used to ensure effective electrical connection of the battery module busbar 1.

[0037] When the SOH of the power battery pack is lower than 80%, or one or more cells are damaged, manifested as undervoltage, large voltage difference, etc., the power battery pack needs to be repaired or transferred to the field of cascade utilization.

[0038] Through extensive practice and research, it was found that when retired power battery packs enter the field of cascade utilization, a large number of modules are difficult to remove. For example, if there is a damaged cell in the module, the pole of the damaged cell is connected to the bus through laser welding. This connection method is very reliable, but it is inefficient and unsafe to remove.

[0039] The root cause of this problem is that the laser-welded busbars and poles are difficult to disassemble. Generally, there is a grinding method to grind off the busbars and then grind the battery poles flat. Laser welding is also required for regrouping. On the other hand, during the PACK design stage, the designers failed to take into account the later maintenance and cascade utilization.

[0040] In this embodiment, specifically during cascade utilization, there is a damaged battery cell in the battery module that needs to be replaced, and the two adjacent battery cells are connected to the damaged battery cell through a battery module bus 1. Now the damaged battery cell needs to be removed, and the battery module bus 1 connecting the two adjacent battery cells to the damaged battery cell should be removed.

[0041] In a specific embodiment, a tool can be used to tighten the middle lifting member 12 and pull it upward. After the middle member 13 is removed from the battery module bus 1, the battery module bus 1 remaining on the module pole is properly trimmed to remove the damaged battery cell in the module. Figures 7 - 10 .

[0042] Re-group according to the step-by-step utilization requirements. Specifically, use the strip busbar 3 to re-group. Align the 4 round holes of the strip busbar 3 with the 2 nuts 15 of the busbars 1 of the 2 battery modules of the battery cells that need to be re-connected, and use suitable bolts 4 for fastening. For details, see Figures 11 - 13 This method is fast and convenient.

[0043] The materials of the component 13 and the groove transition area 17 are copper-aluminum alloy materials, which have good ductility.

[0044] The surface treatment of the battery module busbar 1 is nickel plating or tin plating.

[0045] In the current situation of step-by-step utilization where it is impossible to effectively standardize equipment and professionals, it can effectively avoid secondary cutting of the busbar and grinding of the battery cell pole columns, improving the operability and safety of step-by-step utilization. At the same time, it also improves the quality of the electrical connection in the step-by-step utilization of the power battery pack, improves the consistency of the secondary utilization products, can be replicated in batches, and has strong operability.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery module busbar, characterized in that: It comprises: a middle component (13), a middle tilting component (12) arranged at one end of the middle component (13), and a nut (15) and a round hole (16) arranged on the surface of a battery module busbar (1); The battery module busbar (1) is a rectangular parallelepiped, with a thickness smaller than its length and width; The middle component (13) is connected to the busbars on both sides by a groove transition zone (17), and the depth of the groove transition zone (17) is less than the thickness of the battery module busbar (1); A middle tilting piece (12) extends from one end of the middle component (13), and the middle tilting piece (12) tilts upward to form 1 / 4 of a semicircular arc, and the upward height of the middle tilting piece (12) is less than or equal to four times the thickness of the battery module bus (1).

2. The battery module busbar according to claim 1, characterized in that: A rectangular through hole (14) is provided in the groove transition zone (17). The rectangular through hole (14) has the same direction as the groove transition zone (17) and passes through the groove transition zone (17) in sequence. The intervals between adjacent rectangular through holes (14) are the same.

3. The battery module busbar according to claim 2, characterized in that: The middle component (13) and the groove transition zone (17) are made of composite conductive material.

4. The battery module busbar according to claim 3, characterized in that: The battery module busbar (1) is surface-treated by nickel plating or tin plating.

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