Welding-free busbar and detachable battery pack

Abstract

The utility model relates to a welding-free busbar and a detachable battery pack. The welding-free busbar comprises a plurality of battery cell connecting parts which are arranged on a substrate and are connected with battery cells, a plurality of connecting holes are formed in the base plate; battery cell connecting parts are arranged in the middle of the connecting hole at intervals; and the periphery of the battery cell connecting part is connected with the substrate through a plurality of elastic cantilevers, so that the battery cell connecting part can deviate from the plane on which the substrate is positioned, and welding-free connection is realized when the battery cell connecting part is pressed to abut against the end part of the battery cell. According to the utility model, the contact area with the end part of the battery cell is increased by utilizing the battery cell connecting part with the sheet-shaped structure, so that the connection reliability is improved; the four elastic cantilevers can be used for automatically balancing the pressure during abutting, so that the battery cell connecting part is always abutted against the end part of the battery cell in a complete plane; when the pressure plate is applied to a battery pack, the silica gel pad can absorb the tolerance between the busbar and the pressure plate, the pressure when the pressure plate extrudes is increased, and the fitting degree of a battery cell connecting part and a battery cell end part is ensured; and the back glue on the substrate can effectively fix the battery cell, so that the battery cell is prevented from rotating.

Description

Technical Field

[0001] This utility model relates to the field of busbars, and in particular to a solderless busbar and a detachable battery pack. Background Technology

[0002] Patent application CN201821565034.5 discloses a solderless busbar device for cylindrical batteries, where individual cells are connected to copper busbar tabs via conductive springs on an elastic busbar. Voltage sampling is fixed to the copper busbar via connector terminals. The busbar bracket secures the battery and enables solderless connection of the positive and negative terminals and sampling lines. The snap-on solderless design allows for battery replacement during module debugging and facilitates disassembly for reuse without requiring grinding of the positive and negative electrodes. While this patent achieves solderless busbar connection, the small contact area of ​​the conductive spring structure still poses a risk of poor contact.

[0003] Patent application number CN202222953484.4 describes a novel solderless bus. The cell connection part is tightly attracted to the end of the cell by a magnet installed on it for solderless connection. However, the magnet may be demagnetized or its magnetic force may decrease due to long-term use and high temperature environment. Temperature changes during battery operation will also weaken the magnetic force of the magnet, thus posing a risk of poor contact. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a solderless busbar and a detachable battery pack.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A solderless bus includes a plurality of battery cell connection portions disposed on a substrate and connected to battery cells; the substrate is provided with a plurality of connection holes; battery cell connection portions are spaced apart in the middle of the connection holes; the outer periphery of the battery cell connection portions is connected to the substrate by a plurality of elastic cantilever arms so that the battery cell connection portions can be offset from the plane of the substrate and achieve solderless connection when pressed against the end of the battery cell.

[0007] Furthermore, the cell connection portion is circular; four elastic cantilever arms are evenly arranged along the outer periphery of the cell connection portion.

[0008] Furthermore, the substrate is provided with positioning holes for positioning.

[0009] Furthermore, the edge of the substrate extends to form a tap.

[0010] A detachable battery pack, characterized in that: it includes a housing; a battery module is disposed inside the housing; the battery module includes a cell support; a plurality of cells are disposed inside the cell support; a BMS board is connected to the outside of the cell support; a solderless busbar is connected to the end of each cell; a pressure plate fixedly connected to the cell support is provided on the side of the busbar away from the cell support to abut the busbar against the end of the cell to achieve a solderless connection.

[0011] Furthermore, a silicone pad is attached to the side of the cell connection near the pressure plate.

[0012] Furthermore, an adhesive backing layer is provided on the side of the substrate near the end of the battery cell.

[0013] Furthermore, the housing includes an upper shell and a lower shell.

[0014] The beneficial effects of this utility model are as follows: the sheet-like structure of the cell connector increases the contact area with the cell end, thereby increasing the reliability of the connection; the four elastic cantilevers can automatically balance the pressure during contact, ensuring that the cell connector always contacts the cell end with a complete flat surface, thus ensuring the reliability of the connection; when applied in a battery pack, the silicone pad can absorb the tolerance between the busbar and the pressure plate, increasing the pressure during pressure plate compression, and ensuring the fit between the cell connector and the cell end; the adhesive on the substrate can effectively fix the cell and prevent it from rotating, thereby further increasing the reliability of the connection between the cell connector and the cell end. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the busbar structure of this utility model;

[0017] Figure 2 This is an exploded view of the battery pack of this utility model;

[0018] Explanation of reference numerals in the attached figures:

[0019] 10. Substrate; 11. Connecting hole; 12. Cell connection part; 13. Flexible cantilever; 14. Positioning hole; 15. Tap; 110. Upper shell; 120. Lower shell; 200. Battery module; 210. Cell bracket; 220. Cell; 230. BMS board; 240. Silicone pad; 250. Pressure plate; 260. Screw. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example:

[0024] like Figure 1As shown, a solderless busbar includes a plurality of battery cell connection portions 12 disposed on a substrate 10 and connected to battery cells 220. The battery cell connection portions 12 are typically circular to better match the end face of the cylindrical battery cell 220, providing a larger contact area and increasing connection stability. The substrate 10 has a plurality of connection holes 11. Battery cell connection portions 12 are spaced apart in the middle of the connection holes 11. The outer periphery of each battery cell connection portion 12 is connected to the substrate 10 via a plurality of elastic cantilever arms 13. In one embodiment, four elastic cantilever arms 13 are evenly disposed along the outer periphery of each battery cell connection portion 12. The elastic cantilever arms 13 typically have an arc-shaped bending structure, providing better elasticity. The four elastic cantilever arms 13 automatically balance the pressure during contact, ensuring that the battery cell connection portion 12 always contacts the end of the battery cell 220 with a complete flat surface, ensuring reliable connection. The elastic cantilever arms 13 also suspend the battery cell connection portion 12 so that it is not on the same plane as the substrate 10, thus better achieving compression of the battery cell connection portion 12. In one embodiment, as shown... Figure 1 In the structure, the end of the elastic cantilever 13 away from the cell connection part 12 is usually connected to the outer edge of the connection hole 11, so that the cell connection part 12 and the elastic cantilever 13 can be integrally formed by stamping.

[0025] In one embodiment, the end of the elastic cantilever 13 away from the cell connection portion 12 can also be connected to other positions on the substrate 10. The structure of the elastic cantilever 13 can also provide the elastic force required for the solderless connection of the cell 220 connection plate 230.

[0026] In one embodiment, the substrate 10 has positioning holes 14 for positioning; the edge of the substrate 10 extends to form taps 15; the busbar functions to connect the BMS board 230 and the battery cell 220 to achieve current and signal transmission. The substrate 10 of the busbar is made of conductive materials such as nickel sheets, aluminum busbars, copper busbars, and copper-nickel alloys of different thicknesses. The substrate 10 connects the battery cell 220 to achieve current conduction and signal transmission. The positioning holes 14 fix the position of the busbar to ensure that the busbar does not shift. The battery cell connection part 12 is tightly attached to the positive or negative terminal of the battery cell 220 to collect current from the battery cell 220 into the busbar. The shape of the taps 15 is not limited, and they can be connected to the BMS board 230 by screw fastening, laser welding, soldering, etc.

[0027] like Figure 2As shown, a detachable battery pack includes a housing; the housing typically includes an upper shell 110 and a lower shell 120; the upper shell 110 and the lower shell 120 are fixedly connected by screws 260 to form an internal space for accommodating a battery module 200; a sealing ring can be added at the connection between the upper shell 110 and the lower shell 120 to increase its waterproof capability; the battery module 200 is disposed inside the housing; the battery module 200 includes a cell support 210; a plurality of cells 220 are disposed inside the cell support 210; a BMS board 230 is externally connected to the cell support 210; the end of the cell 220 is connected to a solderless busbar as described above; a pressure plate 250 fixedly connected to the cell support 210 is provided on the side of the busbar away from the cell support 210 to abut the busbar against the end of the cell 220 to achieve a solderless connection. The pressure plate 250 is fastened to the cell support 210 by several screws 260, thereby effectively applying pressure to the busbar and ensuring the stability of the connection. In one embodiment, a silicone pad 240 is attached to the side of the cell connection part 12 near the pressure plate 250. The silicone pad 240 is designed with a 30% compression amount. The design of the silicone pad 240 can absorb the tolerance of the battery pack parts and assembly tolerances, ensuring that the busbar and the cell 220 are always tightly pressed together. In one embodiment, a backing adhesive layer is provided on the side of the substrate 10 near the end of the cell 220. The backing adhesive layer is usually double-sided adhesive, thereby bonding the substrate 10 and the end of the cell 220, preventing the electrical connection between the busbar and the cell 220 from failing due to the rotation of the cell 220 or the busbar during actual use. The battery pack with the structure of this utility model uses a solderless busbar, making it easier to disassemble and convenient for maintenance.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A solderless busbar, characterized by: The application relates to a welding-free busbar, which comprises a substrate (10) provided with a plurality of cell connecting parts (12) connected with cells (220); a plurality of connecting holes (11) are arranged on the substrate (10); the cell connecting parts (12) are arranged at the middle part of the connecting holes (11) in a spaced mode; the outer periphery of the cell connecting part (12) is connected with the substrate (10) through a plurality of elastic suspension arms (13) so that the cell connecting part (12) can deviate from the plane of the substrate (10) and realize welding-free connection when being pressed against the end part of the cell (220).

2. A solderless busbar according to claim 1, characterized in that: The cell connecting part (12) is circular; the elastic suspension arms (13) are uniformly arranged at four positions along the outer periphery of the cell connecting part (12).

3. A solderless busbar according to claim 1, wherein: The substrate (10) is provided with a positioning hole (14) for positioning.

4. A solderless busbar according to claim 1, wherein: The edge part of the substrate (10) is extended to form a tap (15).

5. A detachable battery pack characterized by: The application further relates to a battery module (200) comprising a shell; the shell is internally provided with the battery module (200); the battery module (200) comprises a cell support (210); a plurality of cells (220) are arranged in the cell support (210); a BMS plate (230) is connected to the outside of the cell support (210); the end part of the cell (220) is connected with the welding-free busbar as claimed in any one of claims 1-4; the side of the busbar away from the cell support (210) is provided with a pressing plate (250) fixedly connected with the cell support (210) so as to realize welding-free connection by pressing the busbar against the end part of the cell (220).

6. The detachable battery pack of claim 5, wherein: The side of the cell connecting part (12) close to the pressing plate (250) is attached with a silica gel pad (240).

7. The detachable battery pack of claim 5, wherein: The side of the substrate (10) close to the end part of the cell (220) is provided with a back adhesive layer.

8. The detachable battery pack of claim 5, wherein: The shell comprises an upper shell (110) and a lower shell (120).

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