CN216928859U - Busbar subassembly and group battery - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a bus bar assembly and a battery pack. The bus bar assembly includes a bus bar body; in the busbar body, a first connecting part is arranged on one side of the body part to be connected with an inner pole of a battery unit; the second connecting part is arranged on one side of the body part, which is far away from the first connecting part, so as to be connected with the battery shell in the other battery unit; the second connecting portion includes main part region and breach region, and along the extending direction of second connecting portion, the main part region forms the annular structure that is used for around utmost point post with the breach region, and the size of breach region is greater than the size of first connecting portion. In the busbar assembly, the second connecting part can be connected with the battery shell through at least part of the main body area surrounding the pole, and the first connecting part can extend into the annular structure and be connected with the pole so as to ensure the overcurrent capacity; the size of the notch area is larger than that of the first connecting part, so that the distance between the first connecting part and the second connecting part which are connected with the same battery unit can be increased, and the electric clearance can be ensured.

Description

Busbar subassembly and group battery

Technical Field

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

Background

A plurality of battery units are arranged in the battery pack, and each battery unit comprises a plurality of batteries. The adjacent battery cells need to be connected by a positive-polarity connecting part and a negative-polarity bus part of the bus bar so as to derive signals such as voltage in the battery pack.

However, when the connection area between the bus bar and the battery cell is set to be sufficient for each battery cell, the distance between the positive-polarity connection portion and the negative-polarity connection portion is small, and problems of interference or excessively small electrical gap are liable to occur; when the distance between the positive connection portion and the negative connection portion is set to be large, the connection area between the bus bar and the battery cell is insufficient, and the overcurrent capacity is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a bus bar assembly and a battery pack, which can meet the requirements of overcurrent capacity and electrical clearance at the same time.

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 busbar assembly comprising:

a busbar body for connecting two adjacent battery cells; the busbar body includes body portion, first connecting portion and second connecting portion, wherein:

the first connecting part is arranged on one side of the body part, extends from the body part to the direction far away from the body part and is used for connecting the leading-out surface of the pole in one of the two adjacent battery units, and the leading-out surface of the battery shell and the leading-out surface of the pole are positioned on the same side of the battery units;

the second connecting part is arranged on one side of the body part, which is far away from the first connecting part, extends from the body part to the direction far away from the body part and is used for connecting a leading-out surface of a battery shell in the other battery unit of the two adjacent battery units;

the second connecting portion include main part region and breach region, follow the extending direction of second connecting portion, the main part region with the regional annular structure that is used for around utmost point post that forms of breach, just the regional size of breach is greater than the size of first connecting portion.

In the bus bar assembly provided by the application, the second connecting portion are connected with the battery shell through the main body area surrounding the pole setting, so that the connecting area of the second connecting portion and the battery unit can be ensured, and the overcurrent capacity can be ensured. Meanwhile, in the bus bar assembly provided by the application, the size of the gap area is larger than that of the first connecting part, so that on one hand, the structure can facilitate the first connecting parts of other bus bar bodies connected with another battery unit to extend into the annular structure and be connected with the pole columns, and therefore the connecting area of the first connecting parts and the pole columns can be ensured, and the overcurrent capacity can be ensured; on the other hand, this structure setting can increase the distance between the first connecting portion of connecting same battery unit and second connecting portion to satisfy the electric clearance demand, avoid appearing interfering or electric clearance phenomenon too little, thereby can guarantee the security performance of group battery.

According to a second aspect of the present application, there is provided a battery pack including at least two battery cells and a busbar assembly as provided in any of the above claims, wherein:

the battery unit comprises at least one battery, the battery comprises a pole as a first electrode terminal and a battery shell as a second electrode terminal, and the leading-out surface of the battery shell and the leading-out surface of the pole are positioned on the same side of the battery unit;

in the busbar assembly, a first connecting portion of a busbar body is connected with a leading-out surface of a pole in one battery unit in two adjacent battery units, a second connecting portion of the busbar body is connected with a leading-out surface of a battery shell in the other battery unit in the two adjacent battery units, the extending direction of the second connecting portion is followed, and the pole of the other battery unit is arranged in an annular structure formed by a main body region of the second connecting portion and a gap region.

In the group battery that this application embodiment provided, the second connecting portion of busbar body are connected with battery case through the main part region that sets up around utmost point post, can guarantee second connecting portion and battery unit's area of connection, in order to guarantee the ability of overflowing. Meanwhile, in the battery pack provided by the application, the size of the gap area is larger than that of the first connecting part, on one hand, the first connecting part of other bus bar bodies connected with another battery unit can conveniently extend into the annular structure and be connected with the pole, so that the connecting area of the first connecting part and the pole can be ensured, and the overcurrent capacity can be ensured; on the other hand, this structure setting can increase the distance between the first connecting portion of connecting same battery unit and the second connecting portion to satisfy the electric clearance demand, avoid appearing interfering or electric clearance phenomenon too little, thereby can guarantee the security performance of group battery.

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

FIG. 2 is a perspective view of the area A in FIG. 1;

FIG. 3 is an exploded view of the structure of FIG. 2;

fig. 4 is a schematic structural diagram of a first bus bar according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a plurality of first bus bars of FIG. 4;

fig. 6 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

fig. 7 is a schematic diagram of the structure of fig. 6 disposed in a battery case.

The reference numerals are explained below:

100. a busbar body; 110. a body portion; 120. a first connection portion; 121. a branch road area; 122. a connection region; 130. a second connecting portion; 131. a body region; 1311. a first edge; 1312. a second edge; 1313. a raised structure; 132. a notched area; 200. a battery cell; 210. a battery; 211. a pole column; 212. a battery case; 300. a battery box body.

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, so it should 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.

Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application; FIG. 2 is an enlarged view of the structure in area A of FIG. 1; fig. 3 is an exploded view of the structure of fig. 2. As shown in fig. 1, 2 and 3, the battery pack according to the embodiment of the present application includes a busbar assembly and a battery cell 200, wherein,

the battery unit 200 includes at least one battery 210, the battery 210 includes a terminal post 211 as a first electrode terminal and a battery case 212 as a second electrode terminal, and the first electrode terminal and the second electrode terminal are located on the same side of the battery 210;

in the busbar assembly, the first connection part 120 of the busbar body 100 is connected with the leading-out surface of the terminal post 211 in one 200 of the two adjacent battery units 200, and the second connection part 130 of the busbar body 100 is connected with the leading-out surface of the battery housing 212 in the other 200 of the two adjacent battery units 200.

It should be noted that in the battery pack provided in the embodiment of the present application, the first electrode terminal and the second electrode terminal of the battery cell 200 are both located on the same side of the battery cell 200, that is, the first electrode terminal and the second electrode terminal are led out from the same side of the battery cell 200. It is understood that the "same-side lead-out" is compared to the structure in which the conventional first and second electrode terminals are lead out from the opposite sides of the battery cell 200.

For illustrative purposes, the present invention provides a battery pack. With continuing reference to the structures shown in fig. 2 and 3, the battery unit 200 in the battery pack provided in the embodiment of the present application is illustrated by a dashed box, and each battery unit 200 includes a plurality of batteries 210. Illustratively, as shown in fig. 3, each battery unit 200 includes 4 batteries 210, and the 4 batteries 210 extend in a first direction to form a row; adjacent cells 200 are arranged in a second direction, staggered.

It should be understood that, in the structure shown in fig. 2 and 3, the second direction is perpendicular to the first direction, and of course, other angles between the first direction and the second direction may be set according to the requirement, and the setting may be specifically set according to the requirement. In addition, the number and arrangement of the batteries 210 in each battery unit 200 can be set according to the requirement, and the detailed description is omitted.

In one embodiment, with continuing reference to the structure shown in fig. 3, each battery 210 in the battery unit 200 is a cylindrical battery 210, and specifically, the battery 210 includes a cylindrical battery housing 212 and a terminal post 211 protruding from the battery housing 212, where: the terminal post 211 protrudes from the battery housing 212 along the third direction, and an end surface of the terminal post 211 away from the battery 210 is used as a leading-out surface, and the terminal post 211 protrudes from the end surface of the battery housing 212 corresponding to the battery housing 212 is used as a leading-out surface.

It should be understood that the third direction is parallel to the extending direction of the axial line of the pole 211, and perpendicular to the first and second directions. In a specific embodiment, the leading-out surface of the pole 211 and the leading-out surface of the battery housing 212 may be completely parallel, and the perpendicular distance between the two leading-out surfaces is the distance difference between the two surfaces along the third direction. In another specific embodiment, the extraction surface of the pole 211 and the extraction surface of the battery case 212 are approximately parallel, that is, the two extraction surfaces are not in a completely parallel state due to the manufacturing process or the assembling process.

It is noted that the first electrode terminal and the second electrode terminal of each cell 210 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.

With reference to the structure shown in fig. 2 and fig. 3, taking the adjacent battery units 200 along the second direction as an example, the first connecting portion 120 of the bus bar body 100 is connected to the first electrode terminal (the post 211) of each battery 210 in one battery unit 200, and the second connecting portion 130 of the bus bar body 100 is connected to the second electrode terminal (the battery housing 212) of each battery 210 in another battery unit 200.

Specifically, the positive polarity structure of one battery cell 200 is connected to the negative polarity structure of another battery cell 200 through the bus bar body 100, and the adjacent battery cells 200 are connected in series through one bus bar body 100. It should be understood that, at this time, the batteries 210 are connected in parallel in each battery unit 200.

It is worth noting that the embodiment of the application also protects the bus bar assembly structure in the battery pack. Referring to the structures shown in fig. 1 to 5, a bus bar assembly in a battery pack according to an embodiment of the present application includes:

a bus bar body 100, the bus bar body 100 being used to connect two adjacent battery cells 200; the bus bar body 100 includes a body portion 110, a first connection portion 120, and a second connection portion 130, wherein:

the first connecting portion 120 is disposed on one side of the main body portion 110, extends from the main body portion 110 to a direction away from the main body portion 110, and is used for connecting a leading-out surface of a pole 211 serving as a first electrode terminal in one of the two adjacent battery units 200;

the second connecting portion 130 is disposed on a side of the main body portion 110 away from the first connecting portion 120, extends from the main body portion 110 in a direction away from the main body portion 110, and is used for connecting a leading-out surface of the battery case 212 serving as a second electrode terminal in another battery unit 200 of the two adjacent battery units 200;

as shown in fig. 4, the second connection portion 130 includes a main body region 131 and a notched region 132 (indicated by a dotted line), the main body region 131 and the notched region 132 form a ring-shaped structure for surrounding the pole 211 along an extending direction of the second connection portion 130, and a size of the notched region 132 is larger than a size of the first connection portion 120.

It should be noted that, with reference to the structures shown in fig. 1 to 5, the second connection portion 130 is a ring-shaped structure, and the ring-shaped structure surrounds the post 211 serving as the first electrode terminal. Specifically, the second connection portion 130 is connected to the battery case 212 through the body region 131 disposed around the terminal post 211, so that the connection area of the second connection portion 130 to the battery cell 200 can be ensured to ensure the overcurrent capacity.

Meanwhile, the size of the notch region 132 is larger than that of the first connection portion 120, on one hand, the structure can facilitate the first connection portion 120 of another busbar body 100 connected with another battery unit 200 to extend into the annular structure and be connected with the pole 211, so that the connection area of the first connection portion 120 and the pole 211 can be ensured, and the overcurrent capacity can be ensured; on the other hand, the distance between the first connecting part 120 and the second connecting part 130 connected to the same battery unit 200 can be increased by the structural arrangement, so that the requirement of an electrical gap can be met, the phenomenon of interference or too small electrical gap can be avoided, and the safety performance of the battery pack can be ensured.

With continued reference to the structure shown in fig. 4, there may be provided: the center line of the annular structure is collinear with the center line of the pole 211 so as to avoid the second connecting part 130 from mistakenly colliding with the pole 211, thereby improving the safety performance of the battery pack.

In one embodiment, the central angle of the notch region 132 along the extending direction of the second connecting portion 130 is 30 ° to 300 °.

It should be noted that when the central angle corresponding to the notch region 132 is too small, the size of the first connection portion 120 is too small, and the connection area between the first connection portion 120 and the post 211 cannot be ensured, so that the overcurrent capability of the first connection portion 120 is affected; when the central angle corresponding to the notch region 132 is too large, the size of the main body region 131 in the second connection portion 130 is too small, and the connection area between the second connection portion 130 and the battery case 212 cannot be ensured, thereby affecting the overcurrent capability of the second connection portion 130. Therefore, when the central angle corresponding to the notch region 132 is 30 ° to 300 °, the first connection portion 120 and the second connection portion 130 of the busbar body 100 can have a proper overcurrent capability.

In addition, the size of the main body region 131 can be changed by adjusting the central angle corresponding to the notch region 132, so as to adjust the size of the electrical gap.

In the bus bar assembly, the number of the bus bar bodies 100 may be set according to the number of the battery cells 200 to achieve the connection operation of the plurality of battery cells 200. In one embodiment, the number of the bus bar bodies 100 is at least two, and at least two bus bar bodies 100 are arranged in sequence, and adjacent bus bar bodies 100 are insulated from each other.

Specifically, with continued reference to the structure shown in fig. 1-5, the main body region 131 of one busbar body 100 is connected to the battery housing 212 of the battery cell 200; the first connection portion 120 of the adjacent another busbar body 100 protrudes from the notched area 132 into the annular structure, and is connected with the pole 211 of the same battery cell 200.

It should be noted that, in the two bus bar bodies 100 connected to the same battery cell 200, the first connection portion 120 of one bus bar body 100 is surrounded by the main body region 131 of the other bus bar body 100 with a gap therebetween, so as to improve the safety performance of the battery pack.

In one embodiment, referring to the structure shown in fig. 5, in the bus bar body 100: the first connection portion 120 has an extended centerline, which is shown in phantom in fig. 5. Illustratively, the first connection portion 120 is disposed symmetrically or approximately symmetrically about the extended centerline.

With reference to fig. 5 with continuing reference to fig. 4, along the extending direction of the second connecting portion 130, the second connecting portion 130 has a first edge 1311 and a second edge 1312 for separating the main body region 131 and the notch region 132, and the first edge 1311 and the second edge 1312 are symmetrically disposed about the extending center line of the other busbar body 100.

It should be noted that, this structural arrangement can facilitate the connection operation between the adjacent bus bar bodies 100 and the battery unit 200, and specifically, can facilitate the first connection portion 120 of one bus bar body 100 entering the annular structure from the notch region 132 of the other bus bar body 100 and connecting with the pole 211, so as to avoid the first connection portion 120 from mistakenly colliding with the second connection portion 130 of the other bus bar body 100, thereby improving the safety performance of the battery pack.

In one embodiment, referring to the structure shown in fig. 5, the body region 131 of the second connecting portion 130 is provided with a protruding structure 1313, and the protruding structure 1313 is used for connecting with the lead-out surface of the battery case 212.

It should be noted that the protrusion 1313 may enable the first connection portion 120 and the second connection portion 130 to be located at almost the same height on the sides facing away from the battery 210, and enable the first connection portion 120 of one busbar body 100 and the second connection portion 130 of another busbar body 100 to be arranged in the same layer. It should be understood that the protruding dimension of the protruding structure 1313 may need to be adjusted according to the height of the electrode post 211 along the third direction, and will not be described herein; the "same layer arrangement" may be a complete same layer, or may be an approximate same layer.

It should be noted that, this arrangement form makes when a plurality of busbar bodies 100 cooperate and use, along the third direction, only has one deck structure, can reduce the busbar subassembly that this application embodiment provided along the third direction occupation space to promote space utilization in the group battery.

In one embodiment, the projection 1313 extends along the circumferential direction of the battery case 212 in the perpendicular projection of the lead-out surface of the battery case 212 to secure the connection area between the second connection part 130 and the lead-out surface of the battery case 212

In a particular embodiment, the raised structure 1313 is arcuate as shown in fig. 5, and the centerline of the arc is collinear with the centerline of the post 211. Of course, in order to ensure an effective connection between the protruding structure 1313 and the lead-out surface of the battery case 212, a certain gap may be provided between the outer edge of the arc shape and the outer edge of the lead-out surface of the battery case 212.

In one embodiment, the raised structures 1313 may be stamped and formed from a plate body. Specifically, referring to the structure shown in fig. 5, the protruding structure 1313 is in a protruding state on the side facing the leading-out surface of the battery case 212, and is in a recessed state on the side facing away from the end surface of the battery case 212. It should be noted that this form of preparation can simplify the preparation process and facilitate the welding operation between the protruding structure 1313 and the lead-out surface of the battery case 212.

In one embodiment, with continued reference to the structure shown in fig. 4, the first connection portion 120 includes a branch region 121 and a connection region 122 (schematically separated by a dashed line), the branch region 121 connecting the connection region 122 and the body portion 110; the connection region 122 has a profiling structure, the profiling structure is adapted to the shape of the pole 211, and the first connection portion 120 is connected to the leading-out surface of the pole 211 through the profiling structure.

It should be noted that, when the shape of the connection region 122 is similar to that of the terminal 211, the connection area between the first connection portion 120 and the terminal 211 can be better ensured, so as to ensure the overcurrent area and improve the overcurrent capacity.

Illustratively, the connection region 122 is quasi-circular similar to the circular end face of the pole 211. It should be understood that the connecting region 122 may have a generally circular configuration, and in particular, since the connecting region 122 needs to connect the branch regions 121, the connecting region 122 may have a slight deformation in shape at the connection, forming a quasi-circular shape.

It should be noted that the branch region 121 and the pole 211 may be connected by laser welding. In a specific embodiment, a positioning hole may be disposed on the branch region 121, so that the laser device can be accurately positioned, and the welding accuracy can be improved

Of course, the extending angle of the branch road region 121 is not limited to that shown in fig. 4 and 5, for example, as shown in fig. 6, the extending direction of the branch road region 121 may be perpendicular to the main body 110, and of course, other angles may also be set, which are not described herein again.

In one embodiment, a battery case 300 is also included, and the battery case 300 may have one or more chambers therein. Illustratively, as shown in fig. 7, the battery case 300 has four cavities separated by partition beams, and each cavity is provided with a structure as shown in fig. 6. Of course, the structural arrangement within the battery case 300 is not limited thereto.

It should be noted that the partition beams can improve the structural strength of the battery box 300, and may be specifically configured according to the requirement, which is 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 (10)

1. A busbar assembly, comprising: a busbar body (100), the busbar body (100) being for connecting two adjacent battery cells (200); the busbar body (100) includes a body portion (110), a first connection portion (120), and a second connection portion (130), wherein:

the first connecting part (120) is arranged on one side of the body part (110), extends from the body part (110) to the direction far away from the body part (110) and is used for connecting with the leading-out surface of the internal pole (211) of one battery unit (200) of the two adjacent battery units (200);

the second connecting part (130) is arranged on one side, away from the first connecting part (120), of the body part (110), extends from the body part (110) to the direction away from the body part (110) and is used for connecting a leading-out surface of a battery shell in another battery unit (200) of the two adjacent battery units (200), and the leading-out surface of the battery shell (212) and the leading-out surface of the pole (211) are positioned on the same side of the battery units (200);

the second connection portion (130) comprises a main body region (131) and a gap region (132), the main body region (131) and the gap region (132) form an annular structure for surrounding a pole (211) along the extension direction of the second connection portion (130), and the size of the gap region (132) is larger than that of the first connection portion (120).

2. The busbar assembly according to claim 1, wherein the notch region (132) corresponds to a central angle of 30 ° to 300 ° along a direction in which the second connection portion (130) extends.

3. The busbar assembly according to claim 2, wherein the number of the busbar bodies (100) is at least two, and at least two of the busbar bodies (100) are arranged in series, with adjacent busbar bodies (100) having:

the first connecting part (120) of one busbar body (100) extends into the annular structure from the gap area (132) of the other busbar body (100) to be connected with the leading-out surface of the pole (211).

4. The busbar assembly according to claim 3, wherein in the busbar body (100):

the first connection portion (120) has an extended centerline;

along the extending direction of the second connecting portion (130), the second connecting portion (130) has a first edge (1311) and a second edge (1312), the first edge (1311) and the second edge (1312) are used for separating the main body region (131) and the gap region (132), and the first edge (1311) and the second edge (1312) are symmetrically arranged about the extending center line of the other busbar body (100).

5. The busbar assembly according to claim 4, wherein the second connection portion (130) is provided with a protruding structure (1313), the protruding structure (1313) being for connection with a lead-out face of the battery case (212).

6. The busbar assembly according to claim 5, wherein a perpendicular projection of the raised structure (1313) on the exit face of the cell housing extends in a circumferential direction of the cell (210) housing.

7. The busbar assembly according to any of claims 1 to 6, wherein the first connection portion (120) comprises a branch region (121) and a connection region (122), the branch region (121) connecting the connection region (122) and the body portion (110); the connection region (122) is provided with a profiling structure, the profiling structure is matched with the shape of the pole (211), and the first connection part (120) is connected with the leading-out surface of the pole (211) through the profiling structure.

8. A battery pack, comprising at least two battery cells (200) and a busbar assembly according to any one of claims 1 to 7, wherein:

the battery unit (200) comprises at least one battery (210), the battery (210) comprises a pole post (211) serving as a first electrode terminal and a battery shell serving as a second electrode terminal, and the leading-out surface of the battery shell (212) and the leading-out surface of the pole post (211) are positioned on the same side of the battery unit (200);

in the bus bar assembly, a first connecting part (120) of a bus bar body (100) is connected with a leading-out surface of an internal pole (211) of one battery unit (200) of two adjacent battery units (200), a second connecting part (130) of the bus bar body (100) is connected with a leading-out surface of a shell of a battery (210) of the other battery unit (200) of the two adjacent battery units (200), and the pole (211) of the other battery unit (200) is arranged in an annular structure formed by a main body area (131) and a gap area (132) of the second connecting part (130) along the extending direction of the second connecting part (130).

9. The battery pack according to claim 8, wherein two bus bar bodies (100) connect the same battery cell (200), wherein:

the first connecting part (120) of one bus bar body (100) extends into the annular structure of the other bus bar body (100) from the gap area (132) of the other bus bar body (100) and is connected with the leading-out surface of the pole (211).

10. The battery pack of claim 9, wherein the battery (210) is a cylindrical battery (210).

Images