Battery cell monomer, battery cell group and battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and provides a battery cell monomer, a battery cell group and a battery pack. Two electrodes of the battery cell monomer are arranged in parallel in the Z-axis direction; the electrode comprises a first conductive piece, a second conductive piece connected to the first conductive piece through a conductive spring in a stretching state, and a clamping part arranged on the second conductive piece; and the second conductive piece is pulled to the first conductive piece by virtue of the elastic force of the conductive spring, so that the clamping part on the second conductive piece is separably propped against the busbar of the external component and is electrically connected with the busbar. Compared with the prior art, the electrode disclosed by the utility model does not need to be welded with a busbar of an external component, so that the defects of electrode pseudo soldering, false soldering, electrode unsoldering short circuit caused by cell expansion and the like are avoided; in addition, the clamping part can be separated from the busbar of the external component, so that the battery cell monomers can be conveniently disassembled.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a battery cell monomer, a battery cell group and a battery pack. Background Art

[0002] With the development of technology in the field of new energy, batteries are being used more and more widely. Single batteries can be connected in series or in parallel to form battery modules with higher capacity and voltage levels to meet different power requirements. In order to connect the cells in series, the existing technology is achieved by welding the cells to the busbars. This technology is prone to defects such as cold welding and false welding. When the cells are used, they may be desoldered and short-circuited due to cell expansion, and the connection reliability is poor. In addition, the battery pack is made by welding. When a cell or multiple cells fail, it is difficult to disassemble the single or multiple failed cells, which causes the entire battery pack to be scrapped, resulting in a waste of resources.

[0003] Therefore, it is necessary to provide a battery pack technical solution with high connection reliability and easy disassembly of battery cells. Utility Model Content

[0004] The utility model provides a battery cell single body, a battery cell group and a battery pack, which have the advantages of high connection reliability between battery cell single bodies and convenient disassembly of battery cell single bodies.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A battery cell monomer comprises a battery cell body and two electrodes arranged in parallel along the Z-axis direction, wherein the electrodes comprise a first conductive member, a second conductive member connected to the first conductive member via a conductive spring in a stretched state, and a clamping portion arranged on the second conductive member; the second conductive member is pulled toward the first conductive member by the elastic force of the conductive spring, so that the clamping portion on the second conductive member can be detachably abutted against a busbar of an external component and electrically connected to the busbar.

[0007] In one embodiment, a first blind hole is formed on the end face of the first conductive member facing the second conductive member; one end of the second conductive member is inserted into the first blind hole and abuts against the inner end wall of the first blind hole, and the other end is exposed outside the first blind hole; the second conductive member is formed with a second blind hole for communication with the first blind hole; a conductive spring is disposed in the second blind hole and its two ends are respectively connected to the first blind hole wall and the second blind hole wall.

[0008] In one embodiment, a first connecting hook is provided on the inner end wall of the first blind hole; a second connecting hook is provided on the inner end wall of the second blind hole; and two ends of the conductive spring are hooked on the first connecting hook and the second connecting hook respectively.

[0009] In one embodiment, a first card slot and a second card slot are formed on the inner wall of the first blind hole; the first card slot extends along the axial direction of the first blind hole to the opening of the first blind hole; the second card slot extends around the axis of the first blind hole and is connected to the first card slot; and a protrusion that can slide in the first card slot and the second card slot is formed on the circumferential side wall of the second conductive member.

[0010] In one embodiment, the clamping portion is an annular skirt plate surrounding the circumferential side wall of the second conductive member, and the annular skirt plate extends outward from the circumferential side wall of the second conductive member along the radial direction of the second conductive member.

[0011] A battery cell group comprises an insulating support, a bus bar and a battery cell unit, wherein the battery cell units are multiple and arranged in sequence;

[0012] The busbar is located on the side of the insulating support away from the battery cell, and the clamping portion is located on the side of the busbar away from the insulating support. Under the pulling force of the conductive spring, the clamping portion abuts against the busbar.

[0013] In one embodiment, the busbar is a busbar, and the busbar is detachably clamped to the front side of the insulating bracket through a clamping structure.

[0014] In one embodiment, the clamping structure includes two limit blocks arranged on the front side of the insulating bracket, an elastic cantilever arranged on the front side of the insulating bracket and a third clamping slot opened on the bus; the two limit blocks are arranged at intervals in the X-axis direction, and a limit slot is arranged on the inner side of the limit block; the limit slots of the two limit blocks are inserted from top to bottom on the opposite sides of the bus, and the displacement of the bus in the X-axis direction and the Y-axis direction is limited by the limit slots; the elastic cantilever and the third clamping slot limit the displacement of the bus in the Z-axis direction by the elastic cantilever.

[0015] In one embodiment, two bayonet holes are provided on the lower side of the busbar, and the lower side of the bayonet holes is open; a plurality of avoidance holes are provided on the insulating bracket; each avoidance hole is aligned with each bayonet hole one by one; the second guide member passes through the avoidance hole and the bayonet hole; and the clamping portion abuts against the edge of the bayonet hole.

[0016] A battery pack comprises a box body and the above-mentioned battery cell group; the box body is provided with two symmetrical and spaced-apart limiting plates; the battery cell group is arranged in the box body and located between the two limiting plates; the opposite ends of the insulating bracket are respectively fixed to the ends of the two limiting plates.

[0017] The beneficial effects of this application are:

[0018] The electrode of the present application includes a first conductive member, a second conductive member connected to the first conductive member through a conductive spring in a stretched state, and a clamping portion provided on the second conductive member; the second conductive member is pulled toward the first conductive member by the elastic force of the conductive spring, and during this process, the clamping portion on the second conductive member can abut against the busbar of the external component and be electrically connected to the busbar. In this way, the electrode of the present application can be electrically connected to the busbar of the external component.

[0019] Compared with the prior art, the electrodes of the present application do not need to be welded to the busbars of external components, thus avoiding defects such as cold welding of electrodes, false welding, and electrode desoldering and short circuit due to expansion of the battery cell; in addition, the clamping portion of the present application can be separated from the busbars of external components, which is conducive to the disassembly of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the utility model, but should not constitute a limitation of the utility model.

[0021] Figure 1 This is a schematic diagram of the overall structure of a battery cell of an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the combined structure of electrodes according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic structural diagram of a first conductive member according to an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the overall structure of a battery pack according to an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the combined structure of a battery cell, an insulating bracket, and a busbar in an embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the overall structure of the insulating bracket of an embodiment of the utility model;

[0027] Figure 7 It is a partial structural schematic diagram of an insulating bracket according to an embodiment of the utility model;

[0028] Figure 8 It is a schematic diagram of the overall structure of the busbar of an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the combined structure of the box body and the limiting plate of an embodiment of the utility model.

[0030] Notes on the attached drawings:

[0031] 11. Cover plate; 12. Box body; 20. Cell group; 21. Cell monomer; 22. Electrode; 221. First conductive member; 222. Clamping ring; 223. First slot; 224. First blind hole; 225. Second conductive member; 226. Clamping part; 227. Bump; 228. Conductive spring; 229. Pull ring; 230. Second slot; 231. First connecting hook; 30. Insulating bracket; 31. Elastic cantilever; 32. Limiting block; 321. Limiting slot; 40. Bus; 41. Clamping ring; 42. Third slot; 50. Limiting plate. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0033] Please refer to Figures 1 to 9 , now an exemplary description of a battery cell monomer, a battery cell group and a battery pack provided by the utility model is given, see Figure 1 This embodiment discloses a battery cell 21, wherein two electrodes 22 of the battery cell 21 are arranged in parallel along the Z-axis direction. A plurality of battery cell units 21 can form a battery cell group 20, and the electrodes 22 of the plurality of battery cell units 21 are electrically connected to the bus bar 40 of the external component, so that the plurality of battery cell units 21 can be connected in series. It should be understood that the external component refers to a component outside the battery cell unit 21, which can be one of the components constituting the battery cell group 20.

[0034] See also Figure 2 and Figure 3 In this embodiment, the electrode 22 includes a first conductive member 221 , a second conductive member 225 connected to the first conductive member 221 via a conductive spring 228 in a stretched state, and a clamping portion 226 provided on the second conductive member 225 .

[0035] The conductive spring 228 is a common straight spring or spring wire on the market. Furthermore, the conductive spring 228 can also be a non-standard spring specially designed according to actual needs, such as a spring with an elastic special-shaped rod or a special-shaped spring piece, as long as it can provide elastic force and conduct electricity.

[0036] The first conductive member 221 and the second conductive member 225 are electrically connected via the conductive spring 228. The clamping portion 226 is integrally formed with the second conductive member 225, or the clamping portion 226 is welded to the second conductive member 225, or the clamping portion 226 is connected to the second conductive member 225 in other feasible ways, as long as the clamping portion 226 can be fixedly disposed on the second conductive member 225 and electrically connected to the second conductive member 225.

[0037] In the application scenario where the cell unit 21 is separated from the cell group 20, the conductive spring 228 is in a stretched state and has a retracting elastic force. The elastic force of the conductive spring 228 pulls the second conductive member 225 toward the first conductive member 221, so that the second conductive member 225 abuts against the first conductive member 221 on the side of the first conductive member 221 facing downward.

[0038] In the application scenario where the battery cell 21 is integrated into the battery cell group 20, the busbar 40 of the battery cell group 20 is located between the first conductive member 221 and the clamping portion 226 of the second conductive member 225. The conductive spring 228 is in a stretched state and has a retracting elastic force. The elastic force of the conductive spring 228 pulls the second conductive member 225 toward the first conductive member 221, so that the clamping portion 226 on the second conductive member 225 can be detachably abutted against the busbar 40 of the battery cell group 20 and is electrically connected to the busbar 40. At this time, the second conductive member 225 is separated from the first conductive member 221 on the side facing the first conductive member 221. The battery cell 21 is connected to the busbar 40 of the battery cell group 20 through the first conductive member 221, the conductive spring 228 and the second conductive member 225.

[0039] Compared with the prior art, the electrode 22 of the above solution does not need to be welded to the busbar 40, thus avoiding defects such as false welding of the electrode 22, false welding, and desoldering and short circuit of the electrode 22 due to expansion of the battery cell 21. In addition, the clamping portion 226 of the above solution can be separated from the busbar 40 of the external component, which is convenient for disassembling the battery cell 21.

[0040] See also Figure 1 , Figure 2 and Figure 3, the structure of the electrode 22 of this embodiment is further elaborated. In this embodiment, the battery cell 21 includes a conductive end, and the conductive end is hidden in the battery cell 21, so the drawings do not show all the conductive ends. The conductive end is provided with a plug-in slot, the shape of which is adapted to the first conductive member 221, one end of the first conductive member 221 is inserted into the plug-in slot, and is welded and fixed to the plug-in slot, so that the first conductive member 221 is electrically connected to the plug-in slot of the conductive end. Furthermore, the end of the first conductive member 221 away from the plug-in slot includes a snap ring portion 222, and the snap ring portion 222 extends outward from the circumferential side wall of the first conductive member 221 along the radial direction of the first conductive member 221, and the back of the snap ring is welded to the notch edge of the plug-in slot, thereby increasing the contact area between the first conductive member 221 and the plug-in slot, and ensuring the reliability of the electrical connection between the two and the firmness of the connection.

[0041] In this embodiment, the first conductive member 221 has a first blind hole 224 on its end surface facing the second conductive member 225. One end of the second conductive member 225 is inserted into the first blind hole 224 and abuts against the inner end wall of the first blind hole 224, and the other end is exposed outside the first blind hole 224. The second conductive member 225 has a second blind hole for communicating with the first blind hole 224; the conductive spring 228 is disposed in the second blind hole and its two ends are respectively connected to the first blind hole wall and the second blind hole wall. Specifically, the second conductive member 225 is inserted into the end surface of the first blind hole 224 and has a second blind hole; the conductive spring 228 is disposed in the second blind hole. By adopting the above-mentioned scheme, the second conductive member 225 can be partially inserted into the first conductive member 221, which is beneficial to improving the structural compactness of the electrode 22, reducing the length of the electrode 22, and saving the installation space occupied by the electrode 22; in addition, the conductive spring 228 is hidden in the first conductive member 221, so that the appearance structure of the electrode 22 is relatively neat, and the conductive spring 228 is prevented from being electrically connected to external components, thereby reducing the probability of short circuit of the electrode 22.

[0042] In another embodiment of the present application, a first connecting hook 231 is provided on the inner end wall of the first blind hole 224, a second connecting hook is provided on the inner end wall of the second blind hole, and both ends of the conductive spring 228 are hooked on the first connecting hook 231 and the second connecting hook, respectively. Specifically, hooks are provided on both ends of the conductive spring 228, and the two hooks of the conductive spring 228 are hooked on the first connecting hook 231 and the second connecting hook, respectively. With such a structural manner, the conductive spring 228 can be easily disassembled and assembled.

[0043] In another embodiment of the present application, a first slot 223 and a second slot 230 are formed on the inner wall of the first blind hole 224. The first slot 223 extends along the axial direction of the first blind hole 224 to the orifice of the first blind hole 224. The second slot 230 extends around the axis of the first blind hole 224 and is connected to the first slot 223; specifically, the second slot 230 is a semi-annular slot, one end of which is connected to the first slot 223. Of course, the second slot 230 can also be an annular slot, and both opposite sides of the first slot 223 are connected to the second slot 230.

[0044] The circumferential side wall of the second conductive member 225 is provided with a protrusion 227 that can slide in the first slot 223 and the second slot 230. When assembling the second conductive member 225, one end of the second conductive member 225 is inserted into the first blind hole 224, so that the protrusion 227 slides from the upper end of the first slot 223 into the first slot 223 and slides to the bottom of the second slot 230. When the clamping portion 226 abuts against the bus 40 of the electrical component, the second conductive member 225 adaptively moves away from the first conductive member 221 for a distance, which causes the protrusion 227 to move outward along the first clamping groove 223 until the protrusion 227 is aligned with the notch of the second clamping groove 230. At this time, the second conductive member 225 is rotated to make the protrusion 227 slide into the second clamping groove 230. The second clamping groove 230 limits the axial movement of the protrusion 227 along the first conductive member 221, thereby limiting the relative position of the second conductive member 225 and the first conductive member 221, so that the clamping portion 226 of the second component can stably abut against the bus 40 of the battery cell group 20, thereby ensuring the stability of the electrical connection between the two.

[0045] In another embodiment of the present application, the clamping portion 226 is an annular skirt plate surrounding the circumferential side wall of the second conductive member 225, and the annular skirt plate extends outward from the circumferential side wall of the second conductive member 225 along the radial direction of the second conductive member 225. The connection method between the second conductive member 225 and the bus 40 of the battery cell group 20 includes: the second conductive member 225 penetrates the bus 40 of the battery cell group 20, and the clamping portion 226 is clamped on the side of the bus 40 facing away from the first conductive member 221. In other embodiments, the clamping portion 226 can also be a plurality of clamping protrusions protruding from the circumferential side wall of the second conductive member 225.

[0046] See also Figure 4-Figure 8 The present embodiment also discloses a battery cell group 20, which includes an insulating support 30, a bus bar 40 and a battery cell. The battery cell has a plurality of cells and is arranged in sequence. The bus bar 40 is located on the side of the insulating support 30 away from the battery cell. The clamping portion 226 is located on the side of the bus bar 40 away from the insulating support 30. Under the pulling force of the conductive spring 228, the clamping portion 226 abuts against the bus bar 40.

[0047] The busbar 40 includes a group of busbars 40 arranged at intervals in the Z-axis direction on the front side of the insulating support 30; each group of busbars 40 includes busbars 40 arranged at intervals in the X-axis direction. The battery cell 21 is located on the back side of the insulating support 30, and the two electrodes 22 of the battery cell 21 penetrate the insulating support 30. The clamping portion 226 is located on the front side of the insulating support 30. Under the pulling force of the conductive spring 228, the clamping portion 226 abuts against the busbar 40.

[0048] The two electrodes 22 of the cell 21 include a positive electrode and a negative electrode. The positive electrode of one adjacent cell 21 and the negative electrode of the other adjacent cell 21 are arranged side by side in the X-axis direction and are electrically connected through a bus 40 so that the adjacent cell 21 are connected in series.

[0049] In the above-mentioned manner, each battery cell 21 can be connected in series to form a battery cell module. Furthermore, one of the electrodes 22 of the two battery cells 21 located on both sides of the battery cell group 20 constitutes the current transmission end of the battery cell module. The external electrical equipment is connected to the current transmission end of the battery cell module through a wire, so that the external electrical equipment obtains current from the battery cell module.

[0050] In another embodiment of the present application, each battery cell 21 may also be connected in parallel via two bus bars 40 .

[0051] In another embodiment of the present application, the bus 40 is a bus 4040 , and the bus 4040 is detachably clamped to the front side of the insulating bracket 30 via a clamping structure.

[0052] In one embodiment, the clamping structure includes two limit blocks 32 provided on the front of the insulating bracket 30, an elastic cantilever 31 provided on the front of the insulating bracket 30, and a third clamping slot 42 provided on the bus 4040. The two limit blocks 32 are arranged at intervals in the X-axis direction, and a limit slot 321 is provided on the inner side of the limit block 32. The two opposite sides of the bus 4040 are inserted into the limit slots 321 of the two limit blocks 32 from top to bottom, and the displacement of the bus 4040 in the X-axis direction and the Y-axis direction is limited by the limit slots 321. In the process of inserting the opposite sides of the bus 4040 into the limiting groove 321 from top to bottom, the bus 4040 squeezes the elastic cantilever 31, and the elastic cantilever 31 elastically deforms inward until the position of the elastic cantilever 31 corresponds to the position of the third clamping groove 42, and the elastic cantilever 31 slides into the third clamping groove 42 and is clamped with the third clamping groove 42, and the displacement of the bus 4040 in the Z-axis direction is limited by the elastic cantilever 31. When disassembling the bus 4040, the elastic cantilever 31 is pressed, and the elastic cantilever 31 is pressed out of the third clamping groove 42, and then the bus 4040 is pulled upwards away from the limiting groove 321, and the process of disassembling the bus 4040 can be completed, and the disassembly process is convenient and quick.

[0053] In another embodiment of the present application, two bayonet holes 41 are provided on the lower side of the busbar 4040, and the lower side of the bayonet holes 41 is open. The insulating bracket 30 is provided with a plurality of avoidance holes. Each avoidance hole is aligned with each bayonet hole 41 one by one. The second guide member passes through the avoidance hole and the bayonet hole 41. The clamping portion 226 abuts against the edge of the bayonet hole 41. Specifically, the width of the avoidance hole is greater than the width of the bayonet 41. In the process of connecting the second conductive member 225 and the bus 4040, the second conductive member 225 is first passed through the avoidance hole from the back side of the insulating bracket 30, and then the second conductive member 225 is pulled outward in a direction away from the first conductive member 221. The bus 4040 moves from top to bottom so that the bayonet 41 is clamped on the second conductive member 225. Then the second conductive member 225 is released, and the second conductive member 225 moves toward the first conductive member 221 under the elastic force of the conductive spring 228 until the clamping portion 226 of the second conductive member 225 is clamped on the edge of the bayonet 41.

[0054] In another embodiment of the present application, an insulating pull ring 229 is provided at the end of the second conductive member 225 facing away from the first conductive member 221 for manual grasping to pull the second conductive member 225 outward.

[0055] In another embodiment of the present application, a flame retardant plate is provided between adjacent battery cells 21 .

[0056] Please continue to see Figure 4-Figure 9 This embodiment discloses a battery pack, which includes a box body and a battery cell group 20. The box body includes a box body main body 12 and a cover plate 11, and the cover plate 11 is arranged on the top of the box body main body 12, so as to form a closed box inner cavity in the box body 12. The box inner cavity is provided with two symmetrical and spaced limiting plates 50. The battery cell group 20 is arranged on the bottom wall of the box inner cavity and is located between the two limiting plates 50. The opposite ends of the insulating bracket 30 are respectively fixed to the ends of the two limiting plates 50.

[0057] As long as it does not violate the creative idea of ​​the utility model, any combination of various different embodiments of the utility model should be regarded as the content disclosed by the utility model; within the technical concept of the utility model, any simple modification of the technical solution and any combination of different embodiments that do not violate the creative idea of ​​the utility model should be within the protection scope of the utility model.

Claims

1. A battery cell monomer, characterized in that: The battery cell monomer comprises a battery cell body and two electrodes (22) arranged in parallel, and the electrodes (22) comprise: A first conductive member (221); A second conductive member (225), wherein the first conductive member (221) and the second conductive member (225) are connected via a conductive spring (228) in a stretched state; A clamping portion (226), the clamping portion (226) being arranged on the second conductive member (225); the second conductive member (225) is pulled toward the first conductive member (221) by the elastic force of the conductive spring (228), so that the clamping portion (226) on the second conductive member (225) can be detachably abutted against the bus (40) of the external component and electrically connected to the bus (40).

2. The battery cell according to claim 1, characterized in that: A first blind hole (224) is formed on the end surface of the first conductive member (221) facing the second conductive member (225); one end of the second conductive member (225) is inserted into the first blind hole (224) and abuts against the inner end wall of the first blind hole (224), and the other end is exposed outside the first blind hole (224); the second conductive member (225) is formed with a second blind hole for communicating with the first blind hole (224); the conductive spring (228) is arranged in the second blind hole, and its two ends are respectively connected to the first blind hole wall and the second blind hole wall.

3. The battery cell according to claim 2, characterized in that: A first connecting hook (231) is provided on the inner end wall of the first blind hole (224); a second connecting hook is provided on the inner end wall of the second blind hole; and two ends of the conductive spring (228) are hooked on the first connecting hook (231) and the second connecting hook respectively.

4. The battery cell according to claim 2, characterized in that: The inner wall of the first blind hole (224) is provided with a first clamping groove (223) and a second clamping groove (230); the first clamping groove (223) extends along the axial direction of the first blind hole (224) to the opening of the first blind hole (224); the second clamping groove (230) is extended around the axis of the first blind hole (224) and is connected to the first clamping groove (223); the circumferential side wall of the second conductive member (225) is also provided with a protrusion (227) that can slide in the first clamping groove (223) and the second clamping groove (230).

5. The battery cell according to any one of claims 1 to 4, characterized in that: The clamping portion (226) is an annular skirt plate surrounding the circumferential side wall of the second conductive member (225), and the annular skirt plate extends outward from the circumferential side wall of the second conductive member (225) along the radial direction of the second conductive member (225).

6. A battery cell group, characterized in that: It comprises an insulating support (30), a busbar (40) and a battery cell, wherein the battery cell is in plurality and arranged in sequence, and the battery cell is the battery cell according to any one of claims 1 to 5; The busbar (40) is located on a side of the insulating support (30) away from the battery cell, the clamping portion (226) is located on a side of the busbar (40) away from the insulating support (30), and under the pulling force of the conductive spring (228), the clamping portion (226) abuts against the busbar (40).

7. The battery pack according to claim 6, characterized in that: The busbar (40) is detachably clamped to the front side of the insulating bracket (30) via a clamping structure.

8. The battery pack according to claim 7, characterized in that: The clamping structure comprises two limit blocks (32) arranged on the front of the insulating bracket (30), an elastic cantilever (31) arranged on the front of the insulating bracket (30), and a third clamping slot (42) opened on the busbar (40); The two limit blocks (32) are arranged at intervals, and a limit groove (321) is provided on the inner side of the limit block (32); the bus (40) is inserted into the limit grooves (321) of the two limit blocks (32) on opposite sides; and the elastic cantilever (31) is engaged with the third clamping groove (42).

9. The battery cell assembly according to claim 7, characterized in that: The busbar (40) is provided with two bayonet holes (41) on the lower side, and the bayonet holes (41) are open on the lower side; the insulating bracket (30) is provided with a plurality of avoidance holes; each of the avoidance holes corresponds to each of the bayonet holes (41) one by one; the second conductive member (225) passes through the avoidance holes and the bayonet holes (41); and the clamping portion (226) abuts against the edge of the bayonet holes (41).

10. A battery pack, characterized in that: It comprises a box body and a battery cell group as claimed in claim 9; the box body is provided with two symmetrical and spaced-apart limiting plates (50); the battery cell group is arranged in the box body and is located between the two limiting plates (50); the opposite ends of the insulating bracket (30) are respectively fixed to the ends of the two limiting plates (50).

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