CN217334340U - Busbar and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field provides a busbar and group battery. The bus bar includes: this somatic part and the first connecting portion and the second connecting portion of locating this somatic part both sides, wherein: the first connecting part is used for connecting at least two first electrode terminals in one battery unit, the second connecting part is used for connecting at least two second electrode terminals in another battery unit, and the arrangement direction of the second connecting part and the first connecting part forms a first direction; the body part is provided with a buffer structure; the first connecting portion and/or the second connecting portion are/is provided with a buffer groove. In this busbar, the dashpot cooperates with buffer structure, can cushion the busbar from a plurality of directions, in order to promote the suitability of busbar for this busbar adapts to the assembly of the battery unit under the different roughness condition, and, adapts to the assembly under the certain assembly tolerance, can carry out effective connection between assurance busbar and battery unit.

Description

Busbar and battery pack

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a busbar and group battery.

Background

A plurality of battery units are arranged in the battery pack, and the battery units need to be connected through a bus bar so as to lead out signals such as voltage in the battery pack.

However, the following problems exist between the battery cells and the bus bars: assembly tolerances can result in inefficient connection between the battery cells and the bus bars when the battery cells and the bus bars are installed; after the battery cells and the bus bars are mounted, the bus bars cannot be effectively connected to the battery cells due to external vibration and the like.

SUMMERY OF THE UTILITY MODEL

The utility model provides a busbar and group battery to promote the suitability of busbar, and, promote the security performance of group battery.

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

according to a first aspect of the present invention, there is provided a busbar, comprising: this somatic part with locate first connecting portion and the second connecting portion of this somatic part both sides, wherein:

the first connecting part is used for connecting at least two first electrode terminals in one battery unit, the second connecting part is used for connecting at least two second electrode terminals in another battery unit, the polarity of the second electrode terminals is opposite to that of the first electrode terminals, and the arrangement direction of the second connecting parts and the first connecting parts forms a first direction;

the body part is provided with a buffer structure, the buffer structure extends along a second direction, an included angle between the second direction and the first direction is more than 0 degree, and the buffer structure is used for buffering along the first direction;

the first connecting portion and/or the second connecting portion are/is provided with a buffer slot, and the buffer slot extends along the first direction.

In the busbar provided by the application, the first connecting part is used for connecting at least two first electrode terminals in one battery unit, and the second connecting part is used for connecting at least two second electrode terminals in another battery unit. When using the busbar that this application provided, the busbar that this application provided cushions through locating the buffer structure between first connecting portion and the second connecting portion along the first direction to and cushion through the dashpot of locating first connecting portion and/or second connecting portion, in order to guarantee that first connecting portion can be connected with two at least first electrode terminals, the second connecting portion can be connected with two at least second electrode terminals.

It should be noted that, the busbar that this application provided passes through dashpot and buffer structure cooperation, can cushion the busbar from a plurality of directions, with the suitability that promotes the busbar, the guarantee busbar can be connected with a plurality of electrode terminals, make this busbar adapt to the assembly of the battery unit under the different roughness circumstances, and, adapt to the assembly under the certain assembly tolerance, can effectively be connected between assurance busbar and battery unit, thereby can promote the security performance of group battery. Simultaneously, every dashpot extends along first direction in the busbar that this application provided, and the extending direction of dashpot is parallel with the electric current direction between first electrode terminal and the second electrode terminal to do not influence the conductivity of busbar.

According to a second aspect of the present application, there is provided a battery pack including at least two battery cells and a bus bar as provided in any of the above-described embodiments, wherein a first connecting portion of the bus bar connects at least two first electrode terminals in one battery cell, and a second connecting portion of the bus bar connects at least two second electrode terminals in another battery cell, the second electrode terminals being opposite in polarity to the first electrode terminals.

In the battery pack provided by the application, the first connecting part of the bus bar is used for connecting at least two first electrode terminals in one battery unit, and the second connecting part is used for connecting at least two second electrode terminals in another battery unit. When using the busbar that this application provided, the busbar that this application provided cushions through locating the buffer structure between first connecting portion and the second connecting portion along the first direction to and cushion through the dashpot of locating first connecting portion and/or second connecting portion, in order to guarantee that first connecting portion can be connected with two at least first electrode terminals, the second connecting portion can be connected with two at least second electrode terminals.

It should be noted that, in the group battery that this application provided, the busbar passes through dashpot and buffer structure cooperation, can cushion the busbar from a plurality of directions, in order to promote the suitability of busbar, the guarantee busbar can be connected with a plurality of electrode terminals, make this busbar adapt to the assembly of the battery unit under the different roughness condition, and, adapt to the assembly under the certain assembly tolerance, in order to guarantee that busbar and battery unit can effectively be connected, thereby can promote the security performance of group battery. Simultaneously, in the group battery that this application provided, every dashpot extends along first direction, and the extending direction of dashpot is parallel with the electric current direction between first electrode terminal and the second electrode terminal to do not influence the conductivity of busbar.

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 so as 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 structural diagram of a battery pack provided in an embodiment of the present application;

fig. 2 is a schematic perspective view of the bus bar shown in fig. 1 according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a bus bar according to an embodiment of the present disclosure;

FIG. 4 is a schematic plan view of the bus bar of FIG. 2;

fig. 5 is a schematic diagram of a third structure of a bus bar according to an embodiment of the present disclosure.

The reference numerals are explained below:

100. a bus bar; 110. a body portion; 120. a first connection portion; 121. a first sub-connection portion; 130. a second connecting portion; 131. a second sub-connection portion; 140. a buffer structure; 150. a buffer tank; 160. positioning holes; 200. a battery cell.

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 present application provides a bus bar 100. Fig. 1 is a schematic structural diagram of a bus bar 100 applied to a battery pack according to an embodiment of the present disclosure, and fig. 2 is a schematic perspective structural diagram of the bus bar 100 in fig. 1. Referring to the structure shown in fig. 2 in conjunction with fig. 1, the bus bar 100 includes: the body 110, and the first and second connection parts 120 and 130 disposed at both sides of the body 110. It should be understood that the body portion 110, the first connection portion 120, and the second connection portion 130 are schematically divided by dotted lines for easy understanding.

With continuing reference to fig. 1 and with reference to the structure shown in fig. 2, the first connecting portion 120 is used to connect at least two first electrode terminals in one battery cell 200, the second connecting portion 130 is used to connect at least two second electrode terminals in another battery cell 200, the polarity of the second electrode terminals is opposite to that of the first electrode terminals, and the arrangement direction of the second connecting portion 130 and the first connecting portion 120 forms a first direction;

the main body 110 is provided with a buffer structure 140, the buffer structure 140 extends along a second direction, an included angle between the second direction and the first direction is greater than 0 ° (i.e. the second direction is not parallel to the first direction), and the buffer structure 140 is used for buffering along the first direction;

the first connection portion 120 and/or the second connection portion 130 are provided with buffer grooves 150, and the buffer grooves 150 extend in the first direction.

It is noted that the battery cells 200 are schematically divided by a dotted line frame in fig. 1 for clarity of illustrating the structure of the battery cells 200. Each cell 200 includes a plurality of cells, the plurality being at least two. Illustratively, each battery cell 200 includes 2 batteries as shown in fig. 1. It should be understood that the number of batteries in each battery unit 200 is not limited to the structure as shown in fig. 1, and thus, will not be described herein.

It should be understood that, when the first connecting portion 120 connects at least two first electrode terminals and the second connecting portion 130 connects at least two second electrode terminals, the bus bar 100 provided in the embodiment of the present application needs to connect at least four points, which may be in a plane or an approximate plane.

In applying the bus bar 100 according to the embodiment of the present disclosure, the bus bar 100 is buffered by the buffer structure 140 disposed between the first connecting portion 120 and the second connecting portion 130 along the first direction, and is buffered by the buffer groove 150 disposed at the first connecting portion 120 and/or the second connecting portion 130, so as to ensure that the first connecting portion 120 can be connected to at least two first electrode terminals, and at the same time, the second connecting portion 130 can be connected to at least two second electrode terminals.

It should be noted that, the bus bar 100 provided in the embodiment of the present application, through the cooperation of the buffer slot 150 and the buffer structure 140, may buffer the bus bar 100 from multiple directions, so as to improve the adaptability of the bus bar 100, and ensure that the bus bar 100 may be connected to multiple electrode terminals, so that the bus bar 100 is adapted to the assembly of the battery units 200 under different flatness conditions, and is adapted to the assembly under a certain assembly tolerance, so as to ensure that the bus bar 100 and the battery units 200 may be effectively connected, thereby improving the safety performance of the battery pack.

With continued reference to the structure shown in fig. 1, since the bus bar 100 provided in the embodiment of the present application connects the first electrode terminal of one battery cell 200 of the two adjacent battery cells 200 and the second electrode terminal of the other battery cell 200, and the polarity of the first electrode terminal is opposite to that of the second electrode terminal, a current flows in the bus bar 100 in the first direction. Illustratively, the current flows from the first connection portion 120 to the second connection portion 130 in the direction a, or the current flows from the second connection portion 130 to the first connection portion 120 in the opposite direction of the direction a.

It should be noted that, since each buffer slot 150 extends along the first direction, the buffer slot 150 does not affect the current-guiding capability of the bus bar 100. When the buffer groove 150 is disposed, the buffer groove 150 may be provided to extend completely along the first direction, and the buffer groove 150 may also be provided to extend approximately along the first direction, so as to ensure the current-guiding capability of the busbar 100. Of course, the extending direction of the buffer slot 150 may have a certain angle with the first direction, so as to ensure the buffering effect on the bus bar 100 on the premise of affecting part of the over-current capability.

In a specific embodiment, the buffer tank 150 may be provided only at the first connection portion 120; in another specific embodiment, the buffer tank 150 may be provided only at the second connection portion 130. Of course, the buffer slots 150 may be disposed on both the first connecting portion 120 and the second connecting portion 130 to better improve the adaptability of the busbar 100.

Taking the first connection portion 120 provided with the buffer groove 150 as an example, when the structure of the buffer groove 150 is specifically provided, the buffer groove 150 may be a hole structure provided in the first connection portion 120, for example. It should be noted that the hole structure may be an open hole structure formed in the first connecting portion 120, for example, referring to the structure shown in fig. 2, the buffer slot 150 is formed in the edge of the first connecting portion 120 and extends toward the body portion 110. Alternatively, the hole structure may be a complete hole structure provided in the first connection portion 120, as shown in fig. 3 for example.

It should be noted that the structure of the buffer slot 150 is not limited to the structure shown in fig. 2 and fig. 3, and may be set according to the requirement, and is not described herein again.

Similarly, the buffer slot 150 of the second connecting portion 130 may be designed as the buffer slot 150 of the first connecting portion 120. For example, as shown in fig. 2, the buffer slot 150 is opened from the edge of the second connecting portion 130 and extends toward the main body portion 110; alternatively, as shown in fig. 3, the buffer tank 150 has a complete hole structure.

In the configuration of the first connection portion 120 and the second connection portion 130, please continue to refer to the configuration shown in fig. 2, the first connection portion 120 may include a plurality of first sub-connection portions 121, the first sub-connection portions 121 are used to connect a first electrode terminal, and a buffer slot 150 is disposed between adjacent first sub-connection portions 121;

the second connection part 130 includes a plurality of second sub-connection parts 131, the second sub-connection parts 131 are used to connect a second electrode terminal, and a buffer groove 150 is disposed between adjacent second sub-connection parts 131.

It should be noted that, by providing the buffer groove 150 between the adjacent first sub-connecting portion 121 and the adjacent second sub-connecting portion 131, the adaptability of the bus bar 100 provided in the embodiment of the present application can be improved, so that the bus bar 100 can adapt to the battery units 200 with different flatness.

Specifically, taking the first connection part 120 as an example, please continue to refer to the structure shown in fig. 1 and 2, each of the first sub-connection parts 121 is used to connect the first electrode terminal of one battery in the battery unit 200. It should be understood that since each battery cell 200 of fig. 1 includes 2 batteries, the bus bar 100 as shown in fig. 4 includes two first sub-connection parts 121 with the buffer groove 150 provided therebetween. It should be noted that the buffer slot 150 divides the adjacent first sub-connecting portions 121 into different regions, so that each region can be buffered or deformed independently, and the adaptability of the bus bar 100 can be improved better.

It is understood that when the battery cell 200 includes more than 2 batteries, the first connection part 120 of the bus bar 100 may include a corresponding number of first sub-connection parts 121. When the buffer tank 150 is specifically provided, it is possible to provide: one buffer groove 150 may be disposed between every two adjacent first sub-connecting portions 121. Of course, the buffer slot 150 may be disposed between a plurality of adjacent first sub-connecting portions 121, and the buffer slot 150 is not disposed between a plurality of adjacent first sub-connecting portions 121, so as to improve the structural strength of the bus bar 100. The setting can be specifically carried out according to the requirements, and the detailed description is omitted here.

When the bus bar 100 is connected to the battery cell 200, the bus bar 100 may be connected to the battery cell 200 by laser welding.

With continued reference to the structure shown in fig. 2, positioning holes 160 may be formed in the bus bars 100 to facilitate connection of the bus bars 100 with the battery cells 200.

In one embodiment, the first sub-connection part 121 is provided with a positioning hole 160 for positioning with the first electrode terminal, so as to improve the accuracy of the connection between the first sub-connection part 121 and the first electrode terminal.

In another embodiment, the second sub-connection part 131 is provided with a positioning hole 160 for positioning with the second electrode terminal, so as to improve the accuracy of the connection between the second sub-connection part 131 and the second electrode terminal.

In another embodiment, the first sub-connecting portion 121 and the second sub-connecting portion 131 are provided with positioning holes 160 to improve the connection accuracy between the bus bar 100 and the battery unit 200.

It should be noted that there are many possibilities for the shape of the positioning hole 160, and for example, the positioning hole 160 may be a circle as shown in fig. 4, or may be a square as shown in fig. 5, which is not described again.

In one embodiment, referring to the structure shown in fig. 4, when the first sub-connecting portion 121 is provided with the positioning holes 160, the buffer slot 150 does not exceed the center line of the two positioning holes 160 along the first direction.

It should be noted that, in fig. 4, the centers of the two positioning holes 160 are illustrated as being connected by a dotted line, and the buffer slot 150 does not exceed the dotted line, so as to ensure the structural strength of the busbar 100.

Likewise, when the second sub-connecting portion 131 is provided with the positioning holes 160, the buffer slot 150 does not go beyond the center line of the two positioning holes 160 to ensure the structural strength of the bus bar 100.

In one embodiment, the second direction is perpendicular to the first direction, as shown, for example, in fig. 1 and 2. Of course, the included angle between the extending direction of the buffer structure 140 and the first direction may also be other angles, which are not described herein again.

It should be noted that, when the first direction is perpendicular to the second direction, the coverage area of the buffer structure 140 along the second direction can be increased to improve the buffering effect of each part of the main body 110.

Specifically, after the first connection part 120 is connected to one battery cell 200, the distance between the second connection part 130 and another battery cell 200 can be increased by pulling the buffer structure 140 along the first direction, so that the bus bar 100 can be effectively connected to two battery cells 200 at the same time; alternatively, after the two battery units 200 are connected to the first connection portion 120 and the second connection portion 130 of the busbar 100, respectively, the two battery units 200 connected to the busbar 100 can be mounted in the battery box by moving the buffer structure 140 in the first direction.

In one embodiment, the buffer structure 140 is a non-linear structure along the first direction.

It should be noted that, since the cushioning structure 140 can realize the adjustment of the distance between the first connecting portion 120 and the second connecting portion 130 in the first direction, the cushioning structure 140 can be configured to be a non-linear structure, so that when the relative distance between the first connecting portion 120 and the second connecting portion 130 needs to be adjusted, the cushioning structure 140 is pulled, so that the cushioning structure 140 expands a partial shape or bends a partial region.

Illustratively, the cushioning structure 140 is one or more of arcuate, stacked Z-shaped, or wave-shaped. Of course, the buffering structure 140 may also have other shapes, and may be specifically configured according to requirements, which is not described herein again.

It should be noted that, when the buffering structure 140 is disposed, the buffering structure 140 may be disposed to protrude to any side according to the layout of the battery box. Specifically, if the bottom of the battery box has a larger space at the position corresponding to the buffering structure 140, the buffering structure 140 may be arranged to protrude to the bottom of the battery box; alternatively, the buffer structure 140 may be provided to protrude toward the top of the battery case, provided that the top of the battery case has a large space.

It should be understood that the buffer structure 140 is shown in an arc shape in fig. 2, but is not limited thereto, and may have other shapes, which are not described herein again.

In addition, it should be noted that, since the first direction is perpendicular to the second direction, and the extending direction of the buffer structure 140 is perpendicular to the current direction in the bus bar 100, the buffer structure 140 can be fused when the bus bar 100 is over-current, so as to improve the safety performance of the battery pack.

In one embodiment, the cushioning structure 140 is a weakened portion.

It should be noted that, when the battery in the battery pack is abnormal, the bus bar 100 may be fused from the buffer structure 140 to ensure safety.

It should be noted that, when the bus bar 100 provided in the embodiment of the present application is used, the buffer groove 150 may be used in cooperation with the buffer structure 140, so that the bus bar 100 may be fused in time from the buffer structure 140 when the battery in the battery pack is abnormal, thereby ensuring safety.

The embodiment of the application also provides a battery pack. With continued reference to the structure shown in fig. 1 and 2, the battery pack includes at least two battery cells 200 and the bus bar 100 provided in any of the above-mentioned embodiments, the first connecting portion 120 of the bus bar 100 is connected to at least two first electrode terminals of one battery cell 200, and the second connecting portion 130 of the bus bar 100 is connected to at least two second electrode terminals of another battery cell 200, the second electrode terminals being opposite in polarity to the first electrode terminals.

Specifically, the present application provides a battery pack in which the first connection part 120 of the bus bar 100 is used to connect at least two first electrode terminals of one battery cell 200, and the second connection part 130 of the bus bar 100 is used to connect at least two second electrode terminals of another battery cell 200. It should be understood that, when the first connecting portion 120 connects at least two first electrode terminals and the second connecting portion 130 connects at least two second electrode terminals, the bus bar 100 provided in the embodiment of the present application needs to connect at least four points, which may be in a plane or an approximate plane.

When the battery pack provided by the embodiment of the present application is applied, the bus bar 100 is buffered by the buffer structure 140 disposed between the first connection portion 120 and the second connection portion 130 along the first direction, and is buffered by the buffer groove 150 disposed at the first connection portion 120 and/or the second connection portion 130, so as to ensure that the first connection portion 120 can be connected to at least two first electrode terminals, and at the same time, the second connection portion 130 can be connected to at least two second electrode terminals.

It should be noted that, in the battery pack provided in the embodiment of the present application, the bus bar 100 is matched with the buffering structure 140 through the buffering groove 150, so that the bus bar 100 can be buffered from multiple directions, the adaptability of the bus bar 100 is improved, and it is ensured that the bus bar 100 can be connected with multiple electrode terminals, so that the bus bar 100 is suitable for assembling the battery units 200 under different flatness conditions, and is suitable for assembling under a certain assembling tolerance, so as to ensure that the bus bar 100 can be effectively connected with the battery units 200, and thus the safety performance of the battery pack can be improved. Meanwhile, in the battery pack provided in the embodiment of the present application, each buffer slot 150 extends along the first direction, and the extending direction of the buffer slot 150 is parallel to the current direction between the first electrode terminal and the second electrode terminal, which does not affect the current-conducting capability of the bus bar 100.

In one embodiment, the battery unit 200 includes at least two batteries, which are prismatic batteries.

Illustratively, the first electrode terminal and the second electrode terminal in each square battery are both poles protruding out of the surface of the battery case. It is to be understood that the first electrode terminal and the second electrode terminal in each cell are opposite in polarity and are disposed with insulation therebetween. 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.

It is noted that the first electrode terminal and the second electrode terminal may have different structures, for example, there may be provided: the first electrode terminal is a pole, and the second electrode terminal is a battery shell. Of course, the first electrode terminal and the second electrode terminal may be disposed in other manners, which are not described herein again.

It should be noted that, with continuing reference to the structure shown in fig. 1, when a plurality of battery units 200 in a battery pack form a group, adjacent groups may be disposed in one or more cavities, and the bus bar 100 provided in the embodiments of the present application may be used for bridging between adjacent groups.

Of course, the battery cells 200 in each group may also be connected by using the bus bar 100 provided in the embodiment of the present application, and details are not described again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention 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 (10)

1. A bus bar (100), comprising: a body portion (110), and a first connection portion (120) and a second connection portion (130) provided at both sides of the body portion (110), wherein:

the first connection part (120) is used for connecting at least two first electrode terminals of one battery cell (200), the second connection part (130) is used for connecting at least two second electrode terminals of another battery cell (200), the polarity of the second electrode terminals is opposite to that of the first electrode terminals, and the arrangement direction of the second connection part (130) and the first connection part (120) forms a first direction;

the body part (110) is provided with a buffer structure (140), the buffer structure (140) extends along a second direction, an included angle between the second direction and the first direction is more than 0 degree, and the buffer structure (140) is used for buffering along the first direction;

the first connecting portion (120) and/or the second connecting portion (130) are provided with a buffer groove (150), and the buffer groove (150) extends along the first direction.

2. The busbar (100) according to claim 1, wherein the first connecting portion (120) is provided with the buffer groove (150), and the buffer groove (150) is opened from an edge of the first connecting portion (120) to extend toward the body portion (110); and or (b) a,

the second connecting portion (130) is provided with the buffer slot (150), and the buffer slot (150) is opened from the edge of the second connecting portion (130) and extends towards the body portion (110).

3. The busbar (100) according to claim 1 or 2, wherein the first connecting portion (120) comprises a plurality of first sub-connecting portions (121), the first sub-connecting portions (121) are used for connecting one of the first electrode terminals, and one of the buffer grooves (150) is provided between adjacent first sub-connecting portions (121);

the second connection part (130) includes a plurality of second sub-connection parts (131), the second sub-connection parts (131) are used to connect one of the second electrode terminals, and one of the buffer grooves (150) is disposed between adjacent first sub-connection parts (121).

4. The bus bar (100) according to claim 3, wherein the first sub-connection parts (121) are provided with positioning holes (160) for positioning with the first electrode terminals, and the buffer grooves (150) do not exceed the center line of the positioning holes (160) of the two first sub-connection parts (121) in the first direction;

the second sub-connecting portions (131) are provided with positioning holes (160) for positioning with the second electrode terminals, and the buffer grooves (150) do not exceed the center connecting line of the positioning holes (160) of the two second sub-connecting portions (131) along the first direction.

5. The busbar (100) according to claim 4, wherein the locating hole (160) is circular or square.

6. The busbar (100) according to claim 1 or 2, wherein the second direction is perpendicular to the first direction.

7. The buss bar (100) of claim 6, wherein in the first direction, the buffer structure (140) is arcuate.

8. The busbar (100) according to claim 7, wherein the buffer structure (140) is a weak portion.

9. Battery pack, comprising at least two battery cells (200) and a busbar (100) according to any one of claims 1 to 8, the first connection portion (120) of the busbar (100) connecting at least two first electrode terminals of one battery cell (200), the second connection portion (130) of the busbar (100) connecting at least two second electrode terminals of another battery cell (200), the second electrode terminals being of opposite polarity to the first electrode terminals.

10. The battery pack according to claim 9, wherein the battery unit (200) comprises at least two batteries, the batteries being prismatic batteries.

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