CN216958421U

CN216958421U - Battery pack and bus bar

Info

Publication number: CN216958421U
Application number: CN202220678763.1U
Authority: CN
Inventors: 王留杰
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-07-12
Anticipated expiration: 2032-03-24

Abstract

The utility model relates to the technical field of batteries and provides a battery pack and a bus bar. The battery pack includes: a battery case; the battery pack is arranged in the battery box body, a gap is formed between the battery pack and the side wall of the battery box body, and the battery pack comprises a plurality of battery units; a bus bar including a body portion and a connection portion that connects at least two of the plurality of battery cells; the body part comprises a first part and a second part, the first part is connected with the connecting part, and the second part is bent relative to the first part and inserted into the gap. The second part of the body part can be inserted into the gap, so that the area of the second part can be set to be larger, the flow area of the bus bar when a plurality of battery units are connected can be ensured, and the performance of the battery pack is improved. Meanwhile, the second part is inserted into the gap, the existing space in the battery pack can be reasonably utilized, and therefore the space utilization rate in the battery pack can be improved.

Description

Battery pack and bus bar

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack and a bus bar.

Background

Due to the limitation of the space in the battery box body, the battery units arranged in the same space need to be connected in a reversing way, but when the battery units are connected in a direction-switching way, the overflowing area of the connecting piece is not enough, and the performance of the battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack and a bus bar, which are used for increasing the flow area of a connecting piece and increasing the space utilization rate of the battery pack.

In order to achieve the purpose, the utility model provides the following technical scheme:

according to a first aspect of the present invention, there is provided a battery pack including:

a battery case;

the battery pack is arranged in the battery box body, a gap is reserved between the battery pack and the side wall of the battery box body, and the battery pack comprises a plurality of battery units;

a bus bar including a body portion and a connection portion that connects at least two of the plurality of battery cells; the body part comprises a first part and a second part, the first part is connected with the connecting part, and the second part is bent relative to the first part and inserted into the gap to form a flow surface.

In the battery pack provided by the application, the battery pack is arranged in the battery box body, the bus bar is connected with at least two battery units in the battery pack, specifically, the connecting part of the bus bar is connected with the battery units, the second part in the body part of the bus bar is bent relative to the first part and the second part is bent to be inserted into a gap between the battery pack and the battery box body.

It should be noted that, in the battery pack provided by the present application, since the second portion of the main body portion is insertable into the gap between the battery pack and the battery box, the area of the second portion can be set to be larger, so as to ensure the flow area of the bus bar when connecting the plurality of battery units, thereby improving the performance of the battery pack. Simultaneously, the battery package that this application embodiment provided sets up during the second part of this somatic part inserts the clearance between group battery and battery box, can existing space in the rational utilization battery package, avoids occupying great space alone in the battery package as the second part of excessive flow surface to can promote the space utilization in the battery package.

According to a second aspect of the present application, there is provided a bus bar including a body portion and a connecting portion for connecting at least two of a plurality of battery cells in a battery pack; the main body part comprises a first part and a second part, the first part is connected with the connecting part, and the second part is bent relative to the first part and inserted into a gap formed between the battery pack and other structures to form a flow surface.

In the busbar provided by the application, the second part of the body part can be inserted into the gap between the battery pack and other structures, so that the area of the second part can be larger, the flow area of the busbar when a plurality of battery units are connected can be ensured, and the performance of the battery pack is improved. Simultaneously, in the busbar that this application provided, set up the second part of this somatic part and insert in the clearance between group battery and other structures, current space in can the rational utilization battery package avoids occupying great space alone in the battery package as the second part of excessive current face to can promote space utilization in the battery package.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic partial structure diagram of a battery pack according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a bus bar of FIG. 1;

FIG. 3 is a schematic view of another structure of the bus bar shown in FIG. 1.

The reference numerals are explained below:

100. a battery case; 200. a battery pack; 210. a battery cell; 300. a bus bar; 310. a body portion; 311. a first portion; 312. a second portion; 313. a bending part; 320. a connecting portion; 321. a first sub-connection portion; 322. a second sub-connection portion; 330. an avoidance structure; 340. and (5) reinforcing the structure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

The embodiment of the application provides a battery pack. Fig. 1 is a schematic partial structure diagram of a battery pack according to an embodiment of the present disclosure, fig. 2 is a schematic structural diagram of a bus bar 300 in fig. 1, please refer to the structure shown in fig. 1 in combination with fig. 2, and the battery pack according to the embodiment of the present disclosure includes:

a battery case 100;

the battery pack 200 is arranged in the battery box body 100, a gap A is formed between the battery pack 200 and the side wall of the battery box body 100, and the battery pack 200 comprises a plurality of battery units 210;

a bus bar 300, the bus bar 300 including a body part 310 and a connection part 320, the connection part 320 connecting at least two of the plurality of battery cells 210; the body portion 310 includes a first portion 311 and a second portion 312, the first portion 311 connects with the connecting portion 320, and the second portion 312 is bent with respect to the first portion 311 and inserted into the gap a to form a flow surface. It should be understood that "gap a" may be formed due to assembly process or design requirements; the first portion 311 is a portion of the bus bar 300 that is located on the same plane as the connection portion 320.

In the battery pack provided in the embodiment of the present application, the battery pack 200 is disposed in the battery box 100, and the bus bar 300 connects at least two battery units 210 in the battery pack 200, it should be understood that the battery units 210 connected by the bus bar 300 may be disposed adjacently, or may have a certain distance, that is, they are not disposed adjacently.

Specifically, the connection portion 320 of the busbar 300 is connected to the battery cell 210, the second portion 312 of the body portion 310 of the busbar 300 is bent with respect to the first portion 311, and the second portion 312 is bent to be inserted into the gap a between the battery pack 200 and the battery case 100.

It should be noted that, in the battery pack provided in the embodiment of the present application, since the second portion 312 of the main body 310 can be inserted into the gap a between the battery pack 200 and the battery box 100, the area of the second portion 312 can be set to be larger, so as to ensure the flow area of the bus bar 300 when connecting the plurality of battery units 210, thereby improving the performance of the battery pack.

Meanwhile, the second part 312 of the body part 310 of the battery pack provided by the embodiment of the application is inserted into the gap a between the battery pack 200 and the battery box 100, so that the existing space in the battery pack can be reasonably utilized, and the second part 312 serving as an overflow surface is prevented from occupying a large space in the battery pack alone, so that the space utilization rate in the battery pack can be improved.

For a clearer understanding of the battery pack provided in the embodiments of the present application, an exemplary description will now be made with reference to the structures shown in fig. 1 and 2, specifically as follows:

illustratively, as shown in fig. 1, the number of batteries in each battery cell 210 is 4; the arrangement direction of the 4 batteries forms a second direction which is perpendicular to the first direction; in the first direction, a plurality of battery cells 210 are connected to form one battery row, the battery pack 200 includes a plurality of battery rows arranged in the second direction, and the battery cells 210 located at the edge positions in the two battery rows are connected by using the bus bar 300 as shown in fig. 1 near the side wall of the battery case 100.

Specifically, the second portion 312 of the bus bar 300 can be inserted into the gap a along the third direction, so as to reasonably utilize the existing space in the battery pack, and avoid the second portion 312 as the flow surface from occupying a large space in the battery pack alone, thereby improving the space utilization rate in the battery pack. Illustratively, the third direction is perpendicular to the first direction and the second direction. It should be understood that the extending direction of the third direction is not limited to this, and may also be an inclined arrangement, which is not described herein.

Of course, the arrangement form of the battery cells 210 in the battery pack 200 is not limited thereto, and may be set as required; in addition, more than 3 battery units 210 can be connected by the bus bar 300, which is not described in detail.

When the structure of the bus bar 300 is specifically set, where the first portion 311 and the second portion 312 are bent, the bending can be set according to the requirement for the flow area of the second portion 312 and the size of the gap a between the battery box 100 and the battery pack 200, and details are not repeated herein. Illustratively, as shown in fig. 2, the area of the second portion 312 is larger than the area of the first portion 311.

In one embodiment, the bus bar 300 provided in the embodiments of the present application is an integrally formed structure.

It should be noted that the integrally molded structure can enhance the structural strength of the bus bar 300 and facilitate the assembly of the bus bar 300 with the battery unit 210.

When the bus bar 300 provided in the embodiment of the present application is manufactured, processes such as bending, cutting, and stamping may be used. In one embodiment, as shown in fig. 2, a bent portion 313 may be used to connect the first portion 311 and the second portion 312, and the bent portion 313 is configured in an arc shape. It should be noted that, the arc-shaped structure is adopted to connect the first portion 311 and the second portion 312, so as to improve the structural strength of the main body 310 and prevent the bus bar 300 from being torn from the bent portion.

In one embodiment, the edge of the second portion 312 is notched to avoid other structures in the gap a formed between the battery case 100 and the battery pack 200. Illustratively, as shown in fig. 2, two opposite edges of the first portion 311 are provided with notches S, and the configuration of each notch S is different.

Of course, the shape, number, arrangement position and manufacturing mode of the notches S can be set according to the requirement. Illustratively, the notch S of the first portion 311 may be formed by cutting. Specifically, the notch S shown in fig. 2 is formed by cutting a triangular structure surrounded by a dashed frame, and of course, the notch S may also have other shapes, which is not described herein again.

It should be noted that, after the bus bar 300 is installed, since the main body 310 is closer to the battery pack 200 along the first direction, in one embodiment, the main body 310 is insulated from the battery pack 200 to prevent the main body 310 from contacting the battery pack 200 and causing short circuit. It is understood that the insulating structure may be disposed between the second part 312 and the battery pack 200, and even, the insulating structure may extend between the first part 311 and the battery pack 200.

In particular, when the position of the insulating structure is provided, the insulating structure may be provided on the body part 310 in one embodiment, or may be provided outside the battery pack 200 in another embodiment. Of course, an insulating structure may be formed at both the body part 310 and the outside of the battery pack 200.

In a specific embodiment, the insulating structure is an insulating film, an insulating tube, an insulating tape, or an insulating coating. It should be understood that the tape itself is adhesive, and the insulating film itself is not adhesive, and may be attached using an adhesive, or may be formed on the surface of the structure using other processes.

Illustratively, the insulating film may be formed by dip molding, and the insulating tube may be a heat shrink tube.

Of course, the insulating structure may also be a separate structural member, which is not described in detail herein.

Similarly, the main body 310 and the battery case 100 may be insulated from each other to prevent the main body 310 and the battery case from contacting each other and causing short circuit. It is to be understood that an insulating structure may be provided between the second portion 312 and the battery case 100, and even, the insulating structure may extend between the first portion 311 and the battery case 100.

It should be noted that the arrangement form and the arrangement manner of the insulating structure between the main body 310 and the battery box 100 are the same as or similar to the arrangement manner of the insulating structure between the main body 310 and the battery pack 200, and are not described herein again.

Of course, the insulation between the main body 310 and the battery pack 200 and between the main body 310 and the battery housing can be performed simultaneously, so as to further improve the safety performance of the battery pack provided by the embodiment of the present application.

In one embodiment, in order to accelerate the heat dissipation of the battery pack 200, the battery pack provided by the embodiment of the present application further includes an auxiliary heat conduction member.

In a specific aspect, the auxiliary heat conductive member may be disposed between the body part 310 and the battery pack 200.

It should be noted that the auxiliary heat-conducting member can accelerate the heat exchange from the battery pack 200 to the main body 310, so as to facilitate the heat conduction from the battery pack 200.

In another specific manner, the auxiliary heat conductive member may be provided between the body part 310 and the battery case 100.

It should be noted that the auxiliary heat conducting member can accelerate the heat exchange speed from the main body portion 310 to the battery case 100, so as to facilitate the heat conduction from the battery pack 200.

In another specific embodiment, the auxiliary heat conduction member is disposed between the body part 310 and the battery pack 200, and the auxiliary heat conduction member is disposed between the body part 310 and the battery pack 200.

It should be noted that the auxiliary heat conducting member can accelerate the heat exchange speed from the battery pack 200 to the main body portion 310, so as to facilitate the conduction of the heat in the battery pack 200 to the main body portion 310, and meanwhile, the auxiliary heat conducting member can accelerate the heat exchange speed from the main body portion 310 to the battery box 100, so as to facilitate the conduction of the heat in the battery pack 200 to the outside of the battery box 100.

In one embodiment, the auxiliary heat-conducting member is a heat-conducting paste. For example, the thermal conductive paste may be filled between the second portion 312 and the battery pack 200. Of course, the auxiliary heat conducting member may have other structures, which are not described in detail herein.

It should be noted that, when the thermal conductive adhesive is a thermal conductive adhesive with insulating property, only the thermal conductive adhesive structure may be provided, and the insulating structure is not provided. It should be noted that, this structural arrangement can simplify the structure in the battery box 100, and improve the space utilization rate in the battery pack.

Certainly, still can set up the heat-conducting glue that has insulating properties on insulation system's basis to carry out double protection, further avoid appearing the short circuit condition.

In one embodiment, the battery case 100 includes an annular frame and a partition that divides the annular frame into a plurality of chambers, and the bus bars 300 are connected to the battery cells 210 disposed in one or more of the chambers.

Illustratively, in the configuration shown in fig. 1, the bus bar 300 connects two battery cells 210 located in the same chamber. Of course, there is also a possibility that the bus bar 300 connects the battery cells 210 located in the two chambers, and for example, the bus bar 300 may connect the battery cells 210 located in the two chambers in the second direction, and the structure of the bus bar 300 is exemplified as shown in fig. 3.

In an embodiment, the gap a between the battery box 100 and the battery pack 200 may be formed by an annular frame and the battery pack 200, or may be formed by a partition and the battery pack 200, which is not described herein again.

In one embodiment, each cell 210 includes a plurality of cells having first and second electrode terminals of opposite polarity;

the connection part 320 includes a first sub-connection part 321 and a second sub-connection part 322, the first sub-connection part 321 being connected with the first electrode terminal of one battery cell 210, and the second sub-connection part 322 being connected with the second electrode terminal of the other battery cell 210.

It should be noted that each cell includes a first electrode terminal and a second electrode terminal. In one embodiment, the battery includes a first electrode terminal which is a terminal, a second electrode terminal which is a battery housing, and at least a portion of the terminal protrudes out of the battery housing, wherein the leading-out portion of the battery housing is an end surface of the battery housing, the leading-out portion of the terminal is an end surface of the terminal which protrudes out of the battery housing, the end surface of the battery housing and the end surface of the terminal are located on the same side of the battery, and the end surface of the terminal is higher than the end surface of the battery housing.

The first electrode terminal and the second electrode terminal have opposite polarities and are insulated from each other. Specifically, when the first electrode terminal is a positive polarity terminal, the second electrode terminal is a negative polarity terminal, whereas when the first electrode terminal is a negative polarity terminal, the second electrode terminal is a positive polarity terminal.

In one embodiment, referring to the structure shown in fig. 3, the first sub-connecting portion 321 and the second sub-connecting portion 322 connect the battery cells 210 located in the two cavities.

Since a partition is provided between the two chambers, it is necessary to provide an avoiding structure 330 in the busbar 300 and/or the partition. For example, as shown in fig. 3, an avoidance structure 330 may be provided at the second portion 312 of the busbar 300 to avoid the partition.

Of course, an escape structure 330 may be further provided at the partition to escape the bus bar 300.

It should be noted that when the avoiding structure 330 is provided on the partition, the second portion 312 of the busbar 300 may be provided with the avoiding structure 330 smaller, or even without the avoiding structure 330, so that the flow area of the second portion 312 can be ensured; when the bus bar 300 is provided with the avoiding structure 330, the avoiding structure 330 on the partition member may be smaller or even not provided, so that the structural strength of the battery case 100 can be ensured.

It should be noted that, when the avoiding structure 330 is specifically arranged, the size of the avoiding structure 330 at the bus bar 300 and the partition can be set as required, so as to ensure the flow area of the bus bar 300 and ensure the structural strength of the box body.

In an embodiment, with continued reference to the structure shown in fig. 3, the bus bar 300 further includes a reinforcing structure 340, the reinforcing structure 340 is disposed on the main body 310, and the reinforcing structure 340 is located between the first sub-connecting portion 321 and the second sub-connecting portion 322 along the arrangement direction of the first sub-connecting portion 321 and the second sub-connecting portion 322.

It should be noted that the reinforcing structure 340 may enhance the structural strength of the busbar 300. Illustratively, the reinforcing structure 340 is a raised structure as shown in fig. 3.

In one embodiment, the battery is a cylindrical battery, the first electrode terminal is a pole, the second electrode terminal is a battery shell, and the leading-out surface of the first electrode terminal and the leading-out surface of the second electrode terminal are positioned on the same side of the battery;

the first sub-connection part 321 is provided with a profiling structure, the profiling structure is matched with the shape of the pole, and the first sub-connection part 321 is abutted with the leading-out surface of the pole through the profiling structure;

the second sub-connection portion 322 surrounds at least a portion of the pole, and the second sub-connection portion 322 abuts against a lead-out surface of the battery case.

In one embodiment, the battery may be a cylindrical battery. Of course, the battery may also be a square battery, which is not described herein.

When the battery is a cylindrical battery, the battery case is cylindrical. Since the second sub-connection portion 322 is connected to the end surface of the battery case, the second sub-connection portion 322 may be provided to surround at least a portion of the pole so as to avoid the pole. Illustratively, the second sub-connection portion 322 has an arc shape, and the axis of the arc shape is collinear with the centerline of the pole.

It should be noted that the poles of the plurality of batteries connected to the second sub-connecting portion 322 are connected by other common bus bars, and the common bus bars and one side surface of the second sub-connecting portion 322 departing from the batteries are approximately coplanar, so as to reduce the occupied space of each bus bar along the third direction, thereby increasing the space utilization rate in the battery pack.

In one embodiment, the second sub-connection parts 322 may be provided with a protrusion structure toward the end surface side of the battery case so that the second sub-connection parts 322 are connected with the end surface of the battery case.

In one embodiment, the protrusion structure is also arc-shaped, and the center line of the arc-shape is collinear with the center line of the terminal post to secure the connection area between the second sub-connection part 322 and the end surface of the battery case.

In addition, when the first sub-connection part 321 is used for connecting a pole, the shape of the first sub-connection part 321 may be similar to that of the pole, so as to ensure the connection area of the first sub-connection part 321 and the pole, thereby ensuring the current flowing area and improving the current flowing capability.

Illustratively, the first sub-connection portion 321 is a quasi-circular shape similar to a circular end surface of the pole. It should be understood that the first sub-connection portion 321 may have a substantially circular structure, and since the first sub-connection portion 321 needs to be connected to the main body portion 310, the first sub-connection portion 321 may have a slightly deformed shape at the connection portion, forming a quasi-circular shape.

It should be noted that the first sub-connection portion 321 and the terminal post may be connected by laser welding. In a specific embodiment, a positioning hole may be disposed on the first sub-connecting portion 321, so that the laser device can be accurately positioned, and the welding precision can be improved.

The embodiment of the present application further provides a bus bar 300. For example, referring to the structure shown in fig. 2 in conjunction with fig. 1, the busbar 300 includes a body portion 310 and a connecting portion 320, and the connecting portion 320 is used for connecting at least two of the plurality of battery cells 210 in the battery pack 200; the body 310 includes a first portion 311 and a second portion 312, the first portion 311 is connected to the connection portion 320, and the second portion 312 is bent with respect to the first portion 311 and inserted into a gap a formed between the battery pack 200 and another structure to form a flow surface.

It should be understood that "other structure" refers to any structure where there is interference next to the battery cells 210, and that "other structure" is exemplary of the battery case 100.

In the bus bar 300 provided in the embodiment of the present application, since the second portion 312 of the main body 310 can be inserted into the gap a between the battery pack 200 and the battery box 100, the area of the second portion 312 can be set to be larger, so as to ensure the flow area of the bus bar 300 when connecting the plurality of battery units 210, thereby improving the performance of the battery pack. Meanwhile, in the bus bar 300 provided in the embodiment of the present application, the second portion 312 provided with the body portion 310 is inserted into the gap a between the battery pack 200 and the battery box 100, so that the existing space in the battery pack can be reasonably utilized, and the second portion 312 serving as an overflow surface is prevented from occupying a large space in the battery pack alone, thereby improving the space utilization rate in the battery pack.

It should be understood that the bus bar 300 provided in the embodiment of the present application may be any bus bar 300 in the above-mentioned battery pack technical solution, and details are not described herein again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery pack, comprising:

a battery case (100);

the battery pack (200) is arranged in the battery box body (100) and has a gap with the side wall of the battery box body (100), and the battery pack (200) comprises a plurality of battery units (210);

a busbar (300), the busbar (300) comprising a body portion and a connecting portion (320), the connecting portion (320) connecting at least two of the plurality of battery cells (210); the body part comprises a first part (311) and a second part (312), the first part (311) is connected with the connecting part (320), and the second part (312) is bent relative to the first part (311) and inserted into the gap to form a flow surface.

2. The battery pack according to claim 1, wherein the bus bar (300) is of an integrally molded structure.

3. The battery pack according to claim 2, wherein the body portion further comprises a bent portion interposed between the first portion (311) and the second portion (312) and connecting the first portion (311) and the second portion (312), and the bent portion has an arc-shaped structure.

4. A battery pack according to any one of claims 1 to 3, wherein the body portion is insulated from the battery pack (200); and/or the presence of a gas in the gas,

the main body part and the battery box body (100) are arranged in an insulating way.

5. The battery pack according to claim 4, further comprising an auxiliary heat-conducting member, wherein:

the auxiliary heat conducting member is provided between the body portion and the battery pack (200); and/or the presence of a gas in the gas,

the auxiliary heat conducting member is provided between the body portion and the battery case (100).

6. The battery pack according to claim 5, wherein the auxiliary heat conductive member is a heat conductive paste.

7. The battery pack according to any one of claims 1 to 3, wherein the battery case (100) includes an annular frame and a partition dividing an inner space of the annular frame into a plurality of chambers, and the bus bar (300) connects the battery cells (210) disposed in one or more of the chambers, wherein:

the annular rim forms the gap with the battery pack (200), or the partition forms the gap with the battery pack (200).

8. The battery pack according to claim 7, wherein the battery unit (210) includes a plurality of batteries having first and second electrode terminals of opposite polarity;

the connection part (320) includes a first sub-connection part (321) and a second sub-connection part (322), the first sub-connection part (321) being connected with a first electrode terminal of one of the battery cells (210), and the second sub-connection part (322) being connected with a second electrode terminal of the other of the battery cells (210).

9. The battery pack according to claim 8, wherein the first sub-connecting part (321) and the second sub-connecting part (322) connect battery cells (210) located in two of the cavities, the two battery cells (210) being adjacent, wherein:

the body part is provided with an avoiding structure (330) at the part corresponding to the separating piece; and/or the presence of a gas in the gas,

the separator is provided with an avoiding structure.

10. The battery pack according to claim 8, wherein the bus bar (300) further comprises a reinforcing structure (340), the reinforcing structure (340) is provided to the body portion, and the reinforcing structure (340) is located between the first sub-connection portion (321) and the second sub-connection portion (322) along the arrangement direction of the first sub-connection portion (321) and the second sub-connection portion (322).

11. The battery pack according to claim 8, wherein the battery is a cylindrical battery, the first electrode terminal is a pole, the second electrode terminal is a battery case, and the leading-out surface of the first electrode terminal and the leading-out surface of the second electrode terminal are located on the same side of the battery;

the first sub-connecting part (321) is provided with a profiling structure, the profiling structure is matched with the shape of the pole, and the first sub-connecting part (321) is abutted to the leading-out surface of the pole through the profiling structure;

the second sub-connecting part (322) surrounds at least part of the pole, and the second sub-connecting part (322) is abutted to the leading-out surface of the battery shell.

12. A busbar (300), characterized in that the busbar (300) comprises a body portion and a connecting portion (320), the connecting portion (320) being for connecting at least two of a plurality of battery cells (210) in a battery pack (200); the body part comprises a first part (311) and a second part (312), the first part (311) is connected with the connecting part (320), and the second part (312) is bent relative to the first part (311) and inserted into a gap formed between the battery pack (200) and other structures to form a flow surface.