Battery pack

Abstract

The embodiment of the utility model provides a battery pack which comprises a battery, a busbar, a conducting bar and a conducting bar fixing piece, the busbar is connected with a pole of the battery, the conducting bar is connected with the output ends of a plurality of battery packs or connected with the output ends of the battery packs and a power distribution component in the battery pack, and at least part of the conducting bar is located on the top side of the busbar. The orthographic projection of the conducting bar and the orthographic projection of the busbar on the top wall of the shell are at least partially overlapped, the conducting bar and the conducting bar fixing piece are fixed, the conducting bar fixing piece comprises a fixing seat, the fixing seat comprises a clamping groove part, and the clamping groove part and the busbar are clamped and fixed. The conducting bar fixing piece is not fixed by means of a beam structure in the box body any more, so that no or few beam structures can be arranged in the box body to increase the energy density of the battery pack, the energy density of the battery pack is considered, threaded fasteners for connecting the conducting bar fixing piece and the beam structures are omitted, and the material cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack. Background Art

[0002] The cells in a battery pack are connected in series and parallel via busbars and conductive bars. For longer conductive bars, multiple conductive bar fasteners are required along their length to secure them at multiple points. Currently, a beam structure is incorporated into the battery pack, with the conductive bar fasteners screwed to the beam structure via threaded fasteners. However, this beam structure reduces the energy density of the battery pack. How to achieve conductive bar fastening while maintaining the energy density of the battery pack is a technical problem that requires technical expertise. Utility Model Content

[0003] To solve the above technical problems, the present application provides a battery pack, comprising:

[0004] A battery pack, the battery pack comprising a plurality of batteries arranged in sequence along a first direction, wherein a pole is provided on a top wall of a housing of the battery;

[0005] a busbar connected to the poles, the busbar being at least partially located on the top side of the battery, and an orthographic projection of the busbar on the plane where the top wall of the housing is located being at least partially located within the top wall of the housing;

[0006] a conductive bar, the conductive bar connecting the output terminals of the plurality of battery packs or connecting the output terminals of the battery packs with power distribution components in the battery pack, the conductive bar being at least partially located on the top side of the bus bar, and the orthographic projections of the conductive bar and the bus bar on the top wall of the housing at least partially overlapping;

[0007] A conductive bar fixing member, the conductive bar is fixed to the conductive bar fixing member, the conductive bar fixing member includes a fixing seat, the fixing seat includes a slot portion, and the slot portion is fixedly connected to the bus bar.

[0008] In one embodiment of the battery pack, the conductive bar fixing member includes a clip, which is fixed to the fixing base. The clip includes a first clamping portion and a second clamping portion. A clamping groove is formed between the first clamping portion and the second clamping portion. The conductive bar is inserted into the clamping groove. The first clamping portion and the second clamping portion cooperate to clamp the conductive bar along the thickness direction of the conductive bar.

[0009] In one embodiment of the battery pack, the fixing seat includes a connecting portion, the connecting portion is arranged on the top side of the slot portion, an insertion hole is formed between the connecting portion and the slot portion, the second clamping portion is inserted into the insertion hole, the first clamping portion is at least partially located on the top side of the connecting portion, and the first clamping portion and the second clamping portion cooperate to clamp the connecting portion so that the buckle is fixed to the fixing seat.

[0010] In one embodiment of the battery pack, the first clamping portion has a first end and a second end, the first end and the second end are respectively located on opposite sides of the connecting portion, the first end is connected to the second clamping portion and can be flipped relative to the second clamping portion, and the second end is clamped to the second clamping portion.

[0011] In one embodiment of the battery pack, the slot portion has a slot top wall and a slot bottom wall, the positive projections of the slot top wall and the slot bottom wall on the top wall of the shell at least partially overlap, and the slot top wall and the slot bottom wall cooperate to clamp the bus bar along the thickness direction of the bus bar.

[0012] In one embodiment of the battery pack, the slot portion further has a slot side wall connected between the slot top wall and the slot bottom wall, the bus has a top surface and a bottom surface arranged in sequence along the thickness direction of the bus and a plurality of side surfaces connected between the top surface and the bottom surface, and at least one of the side surfaces of the bus abuts against the slot side wall.

[0013] In one embodiment of the battery pack, the slot portion has a first slot side wall and a second slot side wall connected between the slot top wall and the slot bottom wall, the orthographic projections of the first slot side wall and the second slot side wall on the plane where the shell top wall is located are greater than 0° and less than 180°, the bus has a first side surface and a second side surface connected between the top surface and the bottom surface, the orthographic projections of the first side surface and the second side surface on the plane where the shell top wall is located are greater than 0° and less than 180°, the first side surface abuts against the first slot side wall, and the second side surface abuts against the second slot side wall.

[0014] In one embodiment of the battery pack, the bottom wall of the groove is supported on the top wall of the shell.

[0015] In one embodiment of the battery pack, a buffer layer is provided between the bottom wall of the groove and the top wall of the shell.

[0016] In one embodiment of the battery pack, an annular flange is provided on the top wall of the shell, and the annular flange encloses a pole connection hole. The orthographic projections of the annular flange and the bottom wall of the groove on the plane where the top wall of the shell is located are spaced from each other and the minimum spacing is L, 2mm≤L≤4mm.

[0017] In one embodiment of the battery pack, the orthographic projection of the groove top wall on the plane where the shell top wall is located is larger than the orthographic projection of the groove bottom wall on the plane where the shell top wall is located.

[0018] In one embodiment of the battery pack, in a direction perpendicular to the plane where the top wall of the shell is located, the distance between the top wall of the groove and the bottom wall of the groove is S, and 2mm≤S≤3mm.

[0019] In one embodiment of the battery pack, the fixing seat is made of elastic material.

[0020] In one embodiment of the battery pack, the fixing seat is made of insulating material.

[0021] The battery pack provided in the present application fixes the conductive bar by a conductive bar fixing member, and the conductive bar fixing member is fixed to the bus bar by a card slot portion, and is no longer fixed by means of a beam structure in the box. Therefore, no or fewer beam structures may be provided in the box to increase the energy density of the battery pack. Therefore, the energy density of the battery pack is taken into account, and the threaded fasteners connecting the conductive bar fixing member and the beam structure are eliminated, thereby saving material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A partial plan view of an embodiment of a battery pack provided in this application;

[0023] Figure 2 for Figure 1 A partial stereogram of

[0024] Figure 3 for Figure 2 A three-dimensional diagram of a single conductive bar fixing member;

[0025] Figure 4 for Figure 3 Exploded view of

[0026] Figure 5 A three-dimensional diagram of the conductive sheet fixing member and the busbar being clamped together;

[0027] Figure 6 for Figure 5 sectional view of

[0028] Figure 7 for Figure 1 A three-dimensional diagram of a single battery;

[0029] Figure 8 for Figure 2 The dashed line section view in .

[0030] The following are the descriptions of the reference numerals:

[0031] 1 battery, 1a terminal, 1b shell top wall, A annular flange;

[0032] 2 busbar, 2a top surface, 2b bottom surface, 2c first side surface, 2d second side surface;

[0033] 3 conductive bars;

[0034] 4 Conductive bar fixing member, 41 fixing seat, 411 slot portion, 411a slot top wall, 411b slot bottom wall, 411c first slot side wall, 411d second slot side wall, 412 connecting portion, 412a flat plate, 412b vertical plate, 412c rib plate, B socket, 42 buckle, 421 first clamping portion, 422 second clamping portion, M first end, N second end;

[0035] 5 buffer layer;

[0036] 6. Power distribution components. DETAILED DESCRIPTION

[0037] The present application provides a battery pack. In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] As shown in the figure, the battery pack provided in this application includes a box body (not shown in the figure) and one or more battery packs located in the box body, and also includes a bus bar 2, a conductive bar 3 and a conductive bar fixing member 4 located in the box body.

[0039] Each battery pack includes a plurality of batteries arranged in sequence along a first direction, and different battery packs are arranged in sequence along a second direction, which is perpendicular to the first direction. Only two batteries 1 of one battery pack are shown in the figure.

[0040] Battery 1 includes a housing, with terminals 1a disposed on a top wall 1b of the housing. Terminals 1a include a positive terminal and a negative terminal. The top wall 1b of the housing is parallel to the first and second directions. A battery cell (not visible in the figure) is housed within the housing of battery 1. The cell includes a cell body and positive and negative tabs extending from the cell body. The positive tab is electrically connected to the positive terminal, while the negative tab is electrically connected to the negative terminal.

[0041] The busbar 2 is at least partially located on the top side of the battery 1, and the orthographic projection of the busbar 2 on the plane where the top wall 1b of the shell of the battery 1 is located is at least partially located inside the top wall 1b of the shell. The busbar 2 is fixed to the pole 1a to achieve electrical conduction. Different batteries 1 of the same battery pack are connected in series and / or in parallel through the busbar 2. The present application does not limit the fixing method of the busbar 2 and the pole 1a, as long as the two can be relatively fixed and electrically conductive to each other, for example, they can be fixed by welding or riveting. The present application does not limit the material of the busbar 2, as long as it has good conductivity. For example, aluminum can be used.

[0042] The conductive bar 3 is at least partially located on the top side of the bus bar 2, and the orthographic projections of the conductive bar 3 and the bus bar 2 on the top wall 1b of the shell at least partially overlap. The conductive bar 3 connects the output terminals of different battery packs and / or connects the output terminals of the battery packs with the power distribution components 6 in the battery pack, so that different battery packs can be connected in series and / or in parallel through the conductive bar 3. In the illustrated embodiment, the conductive bar 3 extends along a first direction from one end of the battery pack in the first direction to the other end of the battery pack in the first direction. In actual implementation, the layout direction of the conductive bar 3 can be flexibly designed according to actual needs and is not limited to the illustrated embodiment. The present application does not limit the material of the conductive bar 3, as long as it has good conductivity. For example, copper can be used.

[0043] The conductive bar 3 is fixed to the conductive bar fixing member 4. For a long conductive bar 3, multiple conductive bar fixing members 4 can be sequentially arranged at intervals along its length direction to achieve multi-point fixation of the conductive bar 3 and ensure the fixation reliability of the conductive bar 3.

[0044] The conductive bar fixture 4 includes a mounting base 41, which includes a slot 411 that engages and secures the busbar 2. This design eliminates the need for a beam structure within the housing to secure the conductive bar fixture 4. Consequently, the housing can be free of, or have fewer, beam structures to increase the battery pack's energy density. This balances the battery pack's energy density while eliminating the need for threaded fasteners connecting the conductive bar fixture and beam structure, saving material costs.

[0045] Specifically, the slot portion 411 can be clamped against any two opposing surfaces of the busbar 2 to achieve a clamped connection with the busbar 2. For example, in the illustrated embodiment, the busbar 2 has a top surface 2a, a bottom surface 2b, and multiple side surfaces connected between the top surface 2a and the bottom surface 2b, with the top surface 2a and the bottom surface 2b arranged sequentially along the thickness direction of the busbar 2. The slot portion 411 has a slot top wall 411a, a slot bottom wall 411b, and slot side walls connected between the slot top wall 411a and the slot bottom wall 411b. The slot top wall 411a and the slot bottom wall 411b respectively clamp against the top surface 2a and the bottom surface 2b of the busbar 2, so that the slot top wall 411a and the slot bottom wall 411b cooperate to clamp the busbar 2 along the thickness direction of the busbar 2, thereby achieving a clamped connection between the slot portion 411 and the busbar 2. The groove top wall 411 a and the groove bottom wall 411 b cooperate to clamp the busbar 2 along the thickness direction of the busbar. In this way, the busbar 2 is not easily deformed when clamped by the clamping groove portion 411 .

[0046] Furthermore, at least one side surface of the busbar 2 can be abutted against the sidewall of the slot portion 411. This further enhances the secure connection between the busbar 2 and the slot portion 411. For example, in the illustrated embodiment, the busbar 2 has a first side surface 2c and a second side surface 2d, which are connected between the top surface 2a and the bottom surface 2b. The orthographic projections of the first side surface 2c and the second side surface 2d on the plane of the housing top wall 1b form an angle greater than 0° and less than 180°, which is approximately 90° in the figure. The slot portion 411 has a first slot sidewall 411c and a second slot sidewall 411d, which have an orthographic projection on the plane of the housing top wall 1b that forms an angle greater than 0° and less than 180°, which is approximately 90° in the figure. The first groove side wall 411c abuts against the first side surface 2c, and the second groove side wall 411d abuts against the second side surface 2d. The first groove side wall 411c and the second groove side wall 411d act as a stop for the bus 2, so that the clamping groove portion 411 and the bus 2 are more firmly clamped.

[0047] Furthermore, the groove bottom wall 411b can also be supported on the housing top wall 1b. With the support of the housing top wall 1b, the position of the fixing seat 41 is further stabilized. In addition, a buffer layer 5 can be disposed between the groove bottom wall 411b and the housing top wall 1b. The buffer layer 5 has a certain degree of elasticity, which can absorb vibration energy and reduce the noise caused by vibration. The buffer layer 5 can be made of a common buffer material on the market, such as rubber. In some embodiments, the top and bottom surfaces of the buffer layer 5 are bonded to the groove bottom wall 411b and the housing top wall 1b. This further stabilizes the position of the buffer layer 5 and improves the buffering effect.

[0048] In some embodiments, an annular flange A is provided on the housing top wall 1b. The annular flange A encloses a pole connection hole, through which the pole 1a is inserted. The orthographic projections of the annular flange A and the slot bottom wall 411b on the plane of the housing top wall 1b are spaced apart by a minimum spacing L, with a spacing of 2mm≤L≤4mm. If L is too small, the slot bottom wall 411b is too close to the connection point between the busbar 2 and the pole 1a, which is detrimental to the connection strength between the busbar 2 and the pole 1a. If L is too large, the connection between the busbar 2 and the pole 1a is not secure. This range ensures both the welding strength between the busbar 2 and the pole 1a and the secure connection between the busbar 2 and the holder 41.

[0049] In some embodiments, the orthographic projection of the slot top wall 411a on the plane of the housing top wall 1b is larger than the orthographic projection of the slot bottom wall 411b on the plane of the housing top wall 1b. This ensures a secure connection between the busbar 2 and the fixing base 41 even if the slot bottom wall 411b is farther from the connection point between the busbar 2 and the pole 1a.

[0050] In some embodiments, the fixing seat 41 is elastic, so that when it is clamped with the bus 2, the distance S between the top wall 411a and the bottom wall 411b of the groove can be changed, making the clamping installation more convenient, not easily damaging the bus 2 during clamping, and more secure after clamping.

[0051] In some embodiments, the fixing base 41 is made of an insulating material. For example, the insulating material can be a plastic material such as PP or PC. When a plastic material is used, the fixing base 41 can be injection molded.

[0052] In some embodiments, the distance S between the groove top wall 411a and the groove bottom wall 411b is in the range of: 2mm≤S≤3mm. In this way, it can be ensured that the groove side wall connected between the groove top wall 411a and the groove bottom wall 411b is neither too high nor too low. If the groove side wall is too low, it will be difficult to assemble with the bus 2. If the groove side wall is too high, the groove side wall will easily break when the groove top wall 411a and the groove bottom wall 411b cooperate to clamp the bus 2.

[0053] In the illustrated embodiment, the conductive bar fixing member 4 includes a buckle 42, through which the conductive bar 3 is secured to the conductive bar fixing member 4. The buckle 42 is secured to the fixing base 41. The buckle 42 includes a first clamping portion 421 and a second clamping portion 422 that engage with each other. A clamping groove is formed between the first clamping portion 421 and the second clamping portion 422. The conductive bar 3 is inserted into the clamping groove, and the first clamping portion 421 and the second clamping portion 422 cooperate to clamp the conductive bar 3 along the thickness direction of the conductive bar 3. In this way, the conductive bar 3 is fixed to the conductive bar fixing member 4. This fixing structure is simple and efficient to assemble. In other embodiments, the conductive bar 3 and the conductive bar fixing member 4 can also be fixed using threaded fasteners or adhesive fasteners.

[0054] In the illustrated embodiment, the fixing seat 41 includes a connecting portion 412. The connecting portion 412 is arranged on the top side of the card slot portion 411, more specifically, on the top side of the slot top wall 411a. A socket B is formed between the connecting portion 412 and the slot top wall 411a of the card slot portion 411. The second clamping portion 422 is inserted into the socket B, and the first clamping portion 421 is at least partially located on the top side of the connecting portion 412. The first clamping portion 421 and the second clamping portion 422 cooperate to clamp the connecting portion 412. In this way, the buckle 42 is fixed to the fixing seat 41, and this fixing structure is simple and efficient to assemble. In other embodiments, the second clamping portion 422 of the buckle 42 can also be fixed to the top side of the card slot portion 411 by a threaded fastener or integrally formed on the top side of the card slot portion 411.

[0055] In the illustrated embodiment, the first clamping portion 421 has a first end M and a second end N that are oppositely disposed. The first end M and the second end N are located on opposite sides of the connecting portion 412. The first end M is connected to the second clamping portion 422 and can be flipped relative to the second clamping portion 422. The second end N is engaged with the second clamping portion 422. In other embodiments, both the first end M and the second end N may be engaged with the second clamping portion 422.

[0056] Specifically, the first end M and the second clamping portion 422 can be pivotally connected through an axis and an axis hole to achieve a flippable connection, or can be connected through an integrally injection-molded thinning area, and flipping can be achieved by relying on the flexible deformation of the thinning area.

[0057] In the illustrated embodiment, the top surface of the groove top wall 411a is partially recessed downward to form a groove, and the connecting portion 412 spans the groove walls on opposite sides of the groove, thereby forming the insertion hole B between the connecting portion 412 and the bottom surface of the groove of the groove top wall 411a.

[0058] In the illustrated embodiment, the connecting portion 412 includes a flat plate 412a, a vertical plate 412b arranged on the top side of the flat plate 412a and perpendicular to the flat plate 412a, and a rib plate 412c connected between the flat plate 412a and the vertical plate 412b. The connecting portion 412 of this structure has high strength and can provide reliable support for the buckle 42, thereby ensuring the fixation of the buckle 42 to the fixing seat 41.

[0059] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: The battery pack includes: A battery pack, comprising a plurality of batteries (1) arranged in sequence along a first direction, wherein a pole (1a) is provided on a top wall (1b) of a shell of the battery (1); a busbar (2), the busbar (2) being connected to the pole (1a), the busbar (2) being at least partially located on the top side of the battery (1), and an orthographic projection of the busbar (2) on the plane where the housing top wall (1b) is located being at least partially located within the housing top wall (1b); A conductive bar (3), the conductive bar (3) connecting the output terminals of the plurality of battery packs or connecting the output terminals of the battery packs with the power distribution components (6) in the battery pack, the conductive bar (3) being at least partially located on the top side of the bus bar (2), and the orthographic projections of the conductive bar (3) and the bus bar (2) on the top wall (1b) of the housing at least partially overlapping; A conductive bar fixing member (4), wherein the conductive bar (3) is fixed to the conductive bar fixing member (4), the conductive bar fixing member (4) comprises a fixing seat (41), the fixing seat (41) comprises a slot portion (411), and the slot portion (411) is fixedly engaged with the bus bar (2).

2. The battery pack according to claim 1, wherein: The conductive bar fixing member (4) comprises a buckle (42), the buckle (42) being fixed to the fixing seat (41), the buckle (42) comprising a first clamping portion (421) and a second clamping portion (422), a clamping groove being formed between the first clamping portion (421) and the second clamping portion (422), the conductive bar (3) being inserted into the clamping groove, and the first clamping portion (421) and the second clamping portion (422) cooperating to clamp the conductive bar (3) along the thickness direction of the conductive bar (3).

3. The battery pack according to claim 2, wherein: The fixing seat (41) includes a connecting portion (412), the connecting portion (412) is arranged on the top side of the card slot portion (411), a socket (B) is formed between the connecting portion (412) and the card slot portion (411), the second clamping portion (422) is inserted into the socket (B), the first clamping portion (421) is at least partially located on the top side of the connecting portion (412), and the first clamping portion (421) and the second clamping portion (422) cooperate to clamp the connecting portion (412) so that the buckle (42) is fixed to the fixing seat (41).

4. The battery pack according to claim 3, wherein: The first clamping portion (421) has a first end (M) and a second end (N), the first end and the second end are respectively located on opposite sides of the connecting portion (412), the first end (M) is connected to the second clamping portion (422) and can be turned over relative to the second clamping portion (422), and the second end (N) is clamped to the second clamping portion (422).

5. The battery pack according to any one of claims 1 to 4, characterized in that: The clamping groove portion (411) has a groove top wall (411a) and a groove bottom wall (411b), the positive projections of the groove top wall (411a) and the groove bottom wall (411b) on the housing top wall (1b) at least partially overlap, and the groove top wall (411a) and the groove bottom wall (411b) cooperate to clamp the busbar (2) along the thickness direction of the busbar (2).

6. The battery pack according to claim 5, characterized in that: The slot portion (411) further comprises a slot side wall connected between the slot top wall (411a) and the slot bottom wall (411b); the busbar (2) comprises a top surface (2a) and a bottom surface (2b) sequentially arranged along the thickness direction of the busbar (2) and a plurality of side surfaces connected between the top surface (2a) and the bottom surface (2b); at least one of the side surfaces of the busbar (2) abuts against the slot side wall.

7. The battery pack according to claim 6, characterized in that: The slot portion (411) comprises a first slot side wall (411c) and a second slot side wall (411d) connected between the slot top wall (411a) and the slot bottom wall (411b); the orthographic projections of the first slot side wall (411c) and the second slot side wall (411d) on the plane where the shell top wall (1b) is located are at an angle greater than 0° and less than 180°; the busbar (2) comprises a first side surface (2c) and a second side surface (2d) connected between the top surface (2a) and the bottom surface (2b); the orthographic projections of the first side surface (2c) and the second side surface (2d) on the plane where the shell top wall (1b) is located are at an angle greater than 0° and less than 180°; the first side surface (2c) abuts against the first slot side wall (411c); and the second side surface (2d) abuts against the second slot side wall (411d).

8. The battery pack according to claim 5, characterized in that: The groove bottom wall (411b) is supported on the housing top wall (1b).

9. The battery pack according to claim 8, characterized in that: A buffer layer (5) is provided between the groove bottom wall (411b) and the housing top wall (1b).

10. The battery pack according to claim 5, characterized in that: An annular flange (A) is provided on the shell top wall (1b), the annular flange (A) enclosing a pole connection hole, and the orthographic projections of the annular flange (A) and the slot bottom wall (411b) on the plane where the shell top wall (1b) is located are spaced apart from each other with a minimum spacing of L, 2mm≤L≤4mm.

11. The battery pack according to claim 10, characterized in that: The orthographic projection of the groove top wall (411a) on the plane where the shell top wall (1b) is located is larger than the orthographic projection of the groove bottom wall (411b) on the plane where the shell top wall (1b) is located.

12. The battery pack according to claim 5, wherein: In a direction perpendicular to the plane where the shell top wall (1b) is located, the spacing between the groove top wall (411a) and the groove bottom wall (411b) is S, 2mm≤S≤3mm.

13. The battery pack according to any one of claims 1 to 4, characterized in that: The fixing seat (41) is made of elastic material.

14. The battery pack according to any one of claims 1 to 4, characterized in that: The fixing seat (41) is made of insulating material.

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