Busbar assembly and battery pack

Abstract

This utility model provides a bus assembly and a battery pack. The bus assembly is used to connect at least two battery cell groups and a data acquisition component. The two battery cell groups include a first battery cell group and a second battery cell group. The first battery cell group includes at least one first battery cell, and the second battery cell group includes at least one second battery cell. The bus assembly includes at least one connecting bus assembly, which includes a main body. The main body includes a first battery cell connecting sub-part, a middle connecting sub-part, and a second battery cell connecting sub-part connected in sequence. The first battery cell connecting sub-part is adapted to be electrically connected to the first battery cell, and the second battery cell connecting sub-part is adapted to be electrically connected to the second battery cell. The connecting bus also includes a data acquisition connecting part, which is connected to the middle connecting sub-part so that the middle connecting sub-part is electrically connected to the data acquisition component through the data acquisition connecting part.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a busbar assembly and a battery pack. Background Technology

[0002] In related technologies, when a power battery pack has multiple layers of cells, the battery pack collects the voltage of multiple cells through a data acquisition device, which may result in the acquisition resistance being too high or too low, affecting the accuracy of the acquired voltage. Utility Model Content

[0003] Embodiments of this utility model provide a bus assembly and a battery pack, which can improve the technical problem of inaccurate voltage acquisition.

[0004] In a first aspect, embodiments of this utility model provide a bus assembly for connecting at least two battery cell groups and a data acquisition component. The two battery cell groups include a first battery cell group and a second battery cell group. The first battery cell group includes at least one first battery cell, and the second battery cell group includes at least one second battery cell. The bus assembly includes at least one connection bus assembly, which includes at least one connection bus. The connection bus includes a main body, which includes a first battery cell connection sub-part, a middle connection sub-part, and a second battery cell connection sub-part connected sequentially. The first battery cell connection sub-part is adapted to be electrically connected to the first battery cell, and the second battery cell connection sub-part is adapted to be electrically connected to the second battery cell. The connection bus also includes a data acquisition connection part, which is connected to the middle connection sub-part, so that the middle connection sub-part is electrically connected to the data acquisition component through the data acquisition connection part.

[0005] In one embodiment, the acquisition connection includes a first connection segment and a second connection segment, and the middle connection sub-part is electrically connected to the acquisition component in sequence through the first connection segment and the second connection segment; wherein, the second connection segment is bent and connected to the first connection segment, and the extension direction of the second connection segment forms an angle with the surface of the main body facing the battery cell assembly.

[0006] By bending the second connecting segment to the first connecting segment, and the extension direction of the second connecting segment having an angle with the surface of the main body of the connecting strip facing the cell group, the acquisition component can be located on the side of the first cell group, while the connecting strip is connected to the end face of the first cell group.

[0007] In one embodiment, the fusing current of the acquisition connection is less than that of the main body, so that the acquisition connection forms a fuse. Under overcurrent conditions, the acquisition connection of the connection is preferentially melted, thereby protecting other cells.

[0008] In one embodiment, the acquisition connection includes a first connection segment and a second connection segment, and the middle connection sub-part is electrically connected to the acquisition component through the first connection segment and the second connection segment in sequence; wherein, the width of the first connection segment is smaller than the width of the main body, or the thickness of the first connection segment is smaller than the thickness of the main body, so that the resistance of the acquisition connection is smaller than the resistance of the main body, thereby enabling preferential melting.

[0009] Secondly, embodiments of the present invention provide a battery pack, the battery pack including the bus assembly described above, at least two battery cell groups and a data acquisition component, wherein the bus assembly connects the at least two battery cell groups and the data acquisition component.

[0010] In one embodiment, the size of the first cell and / or the second cell in a first direction of the battery pack is smaller than the size of the first cell and / or the second cell in a second direction of the battery pack, wherein the first direction is the height direction of the battery pack and the second direction is perpendicular to the first direction. By placing the smaller size of the first cell or the second cell in the height direction of the battery pack, it is beneficial to reduce the size of the battery pack in the height direction.

[0011] In one embodiment, the first battery cell group and the second battery cell group are stacked in the first direction, and a plurality of first battery cells of the first battery cell group and a plurality of second battery cells of the second battery cell group are arranged along the second direction, such that the first battery cell group and the second battery cell group are configured to be horizontally arranged.

[0012] In one embodiment, the bus assembly includes two connection bus assemblies, each including a first connection bus assembly and a second connection bus assembly. The first connection bus assembly is electrically connected to one end of the first battery cell group and the second battery cell group, and the second connection bus assembly is electrically connected to the other end of the first battery cell group and the second battery cell group, so that multiple first battery cells and multiple second battery cells are connected in series.

[0013] In one embodiment, among at least one first battery cell and at least two second battery cells corresponding to at least one first battery cell, one end of the at least one first battery cell is connected to one end of at least one of the at least two second battery cells through the corresponding connecting bus of the first connecting bus assembly, and the other end of the at least one first battery cell is connected to the other end of at least another second battery cell through the corresponding connecting bus of the second connecting bus assembly, thereby enabling a plurality of first battery cells of the first battery cell group and a plurality of second battery cells of the second battery cell group to be connected in series through the first connecting bus assembly and the second connecting bus assembly.

[0014] In one embodiment, one end of at least one first battery cell has the opposite polarity to one end of at least one second battery cell; and / or, the other end of at least one first battery cell has the opposite polarity to the other end of at least one second battery cell, thereby connecting a plurality of first battery cells and a plurality of second battery cells in series.

[0015] In one embodiment, the extension direction of the main body of the first connecting bar assembly intersects with the extension direction of the main body of the second connecting bar assembly, thereby forming a series connection. This is beneficial for increasing the end welding area of ​​the multiple first cells and multiple second cells and reducing the difficulty of welding operations.

[0016] In one embodiment, the first connecting segment of the acquisition connecting portion of the connecting bar extends along the height direction of the battery pack, and the extension direction of the main body of the connecting bar has a first angle with the height direction of the battery pack, the first angle being greater than or equal to 0. The extension direction of the second connecting segment of the acquisition connecting portion of the connecting bar has a second angle with the height direction of the battery pack; wherein the second angle is greater than the first angle, so that the acquisition component can be located on the side of the cell group, and the connecting bar is connected to the end face of the cell group and connects the first and second cells that are staggered in series.

[0017] In one embodiment, the acquisition component includes a wire harness type acquisition component. Compared with related technologies, acquisition components include acquisition wire harnesses and FPC (Flexible Printed Circuit) or FFC (Flexible Flat Cable). There are many types of materials for acquisition components. The embodiment of this application uses a wire harness type acquisition component, which is easier to assemble.

[0018] The beneficial effects of the embodiments of this utility model are as follows:

[0019] In an embodiment of this utility model, the acquisition connection part of the connection row connecting the acquisition component is connected to the middle connection sub-part of the connection row. The main body of the connection row includes a first cell connector, a middle connection sub-part, and a second cell connector connected in sequence, such that the middle connection sub-part is located between the first cell connector and the second cell connector. Correspondingly, the connection position between the acquisition component and the main body of the connection row is between the first cell connector and the second cell connector. This reduces the acquisition resistance between the acquisition component and the first cell, and between the acquisition component and the second cell, as well as the deviation caused by the distance between them, when the acquisition component acquires the voltage between the first cell and the second cell, thereby improving the accuracy of the acquired voltage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of the battery pack after the casing has been removed, according to an embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional structural view of the battery pack after the casing has been removed, according to an embodiment of the present invention.

[0023] Figure 3 This is a partially exploded view of the battery pack provided in an embodiment of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the connecting strip connecting acquisition component provided in an embodiment of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the connecting row provided in an embodiment of this utility model;

[0026] Figure 6 This is a three-dimensional structural diagram of the output row connection acquisition component provided in an embodiment of this utility model;

[0027] Figure 7 This is a three-dimensional structural diagram of the battery cell provided in an embodiment of this utility model;

[0028] Icon labels:

[0029] 100. Busbar assembly; 101. First connecting busbar assembly; 102. Second connecting busbar assembly;

[0030] 1. Connecting strip; 10. Main body; 11. First cell connecting sub-section; 12. Second cell connecting sub-section; 13. First acquisition connecting section; 131. First connecting segment; 132. Second connecting segment; 14. Middle connecting sub-section; 15. First positioning hole;

[0031] 20. Acquisition component; 2. Acquisition part; 7. Acquisition harness;

[0032] 3. Output row; 301. Positive output row; 302. Negative output row; 31. Base; 32. Second acquisition connection; 321. Third connection section; 322. Fourth connection section; 33. Fixing part; 35. Second positioning hole;

[0033] 5. Battery cell; 51. First battery cell group; 52. Second battery cell group; 53. First battery cell; 54. Second battery cell; 55. Positive terminal; 56. Negative terminal; 57. One end; 58. The other two ends;

[0034] 6. Fixed bracket; 61. First fixed bracket; 62. Second fixed bracket;

[0035] 8. Fixing strap; Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0037] In related technologies, when a power battery pack has multiple layers of cells, the battery pack collects the voltage of multiple cells through a collection harness and an FPC (Flexible Printed Circuit) or FFC (Flexible Flat Cable). This results in a large variety of materials, affecting assembly efficiency. Furthermore, the connection position between the collection harness and the multiple layers of cells can cause the collection resistance to be too large or too small, affecting the accuracy of the collected voltage.

[0038] Embodiments of this application provide a battery pack, such as Figure 1 and Figure 2 As shown, the battery pack includes a housing (not shown in the attached diagram), a busbar assembly 100, at least two battery cell groups, and a data acquisition component. The busbar assembly 100, the at least two battery cell groups, and the data acquisition component are all installed within the housing. The battery pack can be a power battery pack or an energy storage battery pack.

[0039] In some embodiments, continue to refer to Figure 1 and Figure 2The battery pack includes two cell groups: a first cell group 51 and a second cell group 52. The first cell group 51 is stacked on top of the second cell group 52. The first cell group 51 includes multiple first cells 53 arranged along the length of the battery pack. The second cell group 52 includes multiple second cells 54 arranged along the length or width of the battery pack. The first cell group 51 is stacked on top of the second cell group 52 along the height of the battery pack.

[0040] In this embodiment, the multiple first cells 53 of the first cell group 51 and the multiple second cells 54 of the second cell group 52 are staggered in the height direction of the battery pack, resulting in a pincushion-shaped arrangement of the two cell groups, which is beneficial to improving the energy density of the battery pack. When both the first cells 53 and the second cells 54 are cylindrical cells, the staggered arrangement of the multiple first cells 53 and the multiple second cells 54 also helps to increase the area of ​​the welding region of the multiple first cells 53 and the multiple second cells 54. In one embodiment, the first cell group 51 includes twelve first cells 53, and the second cell group 52 includes thirteen second cells 54.

[0041] In some embodiments, continue to refer to Figure 1 and Figure 2 Both the first battery cell 53 and the second battery cell 54 are configured to be horizontally arranged. That is, the dimensions of the first battery cell 53 and / or the second battery cell 54 in the first direction are smaller than the dimensions of the first battery cell 53 and / or the second battery cell 54 in the second direction. The first direction is the height direction of the battery pack, and the second direction is the width or length direction of the battery pack. Figure 1 As shown in the z-direction, the width direction of the battery pack is... Figure 1 As shown in the y-direction, the length direction of the battery pack is... Figure 1 The x-direction is shown. By placing the smaller size of the first cell 53 or the second cell 54 in the height direction of the battery pack, it is beneficial to reduce the size of the battery pack in the height direction.

[0042] In some embodiments, such as Figures 1 to 3 The busbar assembly 100 includes two connection bus assemblies, each including a first connection bus assembly 101 and a second connection bus assembly 102. The first connection bus assembly 101 is connected to one end of the first battery cell group 51 and the second battery cell group 52, and the second connection bus assembly 102 is electrically connected to the other end of the first battery cell group 51 and the second battery cell group 52, so that multiple first battery cells 53 and multiple second battery cells 54 are connected in series.

[0043] In some embodiments, such as Figures 1 to 3 and Figure 7As shown, the polarity of one end 57 of at least one first cell 53 is opposite to that of one end 57 of at least one second cell 54, and / or the polarity of the other end 58 of at least one first cell 53 is opposite to that of the other end 58 of at least one second cell 54, so that the plurality of first cells 53 in the first cell group 51 and the plurality of second cells 54 in the second cell group 52 can be welded to the two connecting bus assemblies. In one specific embodiment, one end 57 of each of the plurality of first cells 53 in the first cell group 51 is a positive electrode, and the other end 58 of each of the plurality of first cells 53 in the first cell group 51 is a negative electrode. One end of each of the plurality of second cells 54 in the second cell group 52 is a negative electrode, and the other end of each of the plurality of second cells 54 in the second cell group 52 is a positive electrode. This is such that the connecting bus 1 located at one end of the first cell group 51 and the second cell group 52 is connected to the positive electrode of the first cell 53 and the negative electrode of the second cell 54, and the connecting bus 1 located at the other end of the first cell group 51 and the second cell group 52 is connected to the negative electrode of the first cell 53 and the positive electrode of the second cell 54, thereby connecting the plurality of first cells 53 and the plurality of second cells 54 in series.

[0044] In some embodiments, among at least one first cell 53 and at least two second cells 54 corresponding to at least one first cell 53, one end of the at least one first cell 53 is connected to one end of at least one of the at least two second cells 54 through a corresponding connection block 1 of the first connection block assembly 101, and the other end of the at least one first cell 53 is connected to the other end of at least one of the corresponding two second cells 54 through a corresponding connection block 1 of the second connection block assembly 102, thereby enabling the plurality of first cells 53 of the first cell group 51 and the plurality of second cells 54 of the second cell group 52 to be connected in series through the first connection block assembly 101 and the second connection block assembly 102.

[0045] In some embodiments, such as Figure 3 As shown, the extension direction of the main body 10 of the first connecting bar assembly 101 intersects the extension direction of the connecting bar 1 of the second connecting bar assembly 102, so that one end of the first battery cell 53 is connected to one end of the second battery cell 54 on the left, and the other end of the first battery cell 53 is connected to the other end of the second battery cell 54 on the right, thereby forming a series connection. This also helps to increase the end welding area of ​​the multiple first battery cells 53 and the multiple second battery cells 54, and reduce the difficulty of welding operation.

[0046] In some embodiments, such as Figures 3 to 5As shown, both the first connection row assembly 101 and the second connection row assembly 102 include multiple connection rows 1. Each connection row 1 includes a main body 10 and a data acquisition connection 13. The main body 10 includes a first battery cell connection sub-part 11 and a second battery cell connection sub-part 12. The first battery cell connection sub-part 11 is adapted to be electrically connected to a first battery cell 53, and the second battery cell connection sub-part 12 is adapted to be electrically connected to a second battery cell 54. The main body 10 also includes a middle connection sub-part 14, which connects the first battery cell connection sub-part 11 and the second battery cell connection sub-part 12. The data acquisition connection 13 is connected to the middle connection sub-part 14, so that the middle connection sub-part 14 is electrically connected to the data acquisition assembly through the data acquisition connection 13.

[0047] By connecting the acquisition connection part 13 of the connection row 1 of the connection acquisition component to the middle connection sub-part 14 of the connection row 1, wherein the main body 10 of the connection row 1 includes a first cell connection sub-part 11, a middle connection sub-part 14 and a second cell connection sub-part 12 connected in sequence, such that the middle connection sub-part 14 is located between the first cell connection sub-part 11 and the second cell connection sub-part 12, and correspondingly, the connection position of the acquisition component and the main body 10 of the connection row 1 is located between the first cell connection sub-part 11 and the second cell connection sub-part 12, thereby reducing the acquisition resistance between the acquisition component and the first cell and the acquisition resistance between the acquisition component and the second cell when the acquisition component acquires the voltage between the first cell and the second cell, reducing the deviation caused by the distance between the two, and improving the accuracy of the acquired voltage.

[0048] In some embodiments, continue to refer to Figures 3 to 5 The acquisition connection part 13 of the connection row 1 includes a first connection segment 131 and a second connection segment 132. The middle connection sub-part 14 is electrically connected to the acquisition component through the first connection segment 131 and the second connection segment 132 in sequence. The second connection segment 132 is bent and connected to the first connection segment 131, and the extension direction of the second connection segment 132 forms an angle with the surface of the main body 10 of the connection row 1 facing the battery cell group, so that the acquisition component can be located on the side of the first battery cell group 51, and the connection row 1 is connected to the end face of the first battery cell group 51.

[0049] In some embodiments, the fusing current of the acquisition connection portion 13 of the connection bus 1 is less than the fusing current of the main body portion 10, so that the acquisition connection portion 13 forms a fuse. When the connection bus 1 is under overcurrent conditions, the acquisition connection portion 13 of the connection bus 1 will melt first, thereby protecting other battery cells.

[0050] In some embodiments, the width of the first connecting segment 131 of the acquisition connecting portion 13 of the connecting row 1 is smaller than the width of the main body portion 10, or the thickness of the first connecting segment 131 of the acquisition connecting portion 13 is smaller than the thickness of the main body portion 10, so that the resistance of the acquisition connecting portion 13 is greater than the resistance of the main body portion 10, thereby enabling preferential melting.

[0051] In some embodiments, such as Figure 5 As shown, the extension direction of the main body 10 of the connecting strip 1 has a first angle α with the height direction of the battery pack. The first angle α is greater than or equal to 0. The first segment 131 of the acquisition connection part 13 of the connecting strip 1 extends approximately along the height direction of the battery pack. The second segment 132 of the acquisition connection part 13 of the connecting strip 1 has a second angle β with the height direction of the battery pack. The second angle β is approximately a right angle. The first angle α is an acute angle. The second angle β is greater than the first angle α, so that the acquisition component can be located on the side of the cell group. The connecting strip 1 is connected to the end face of the cell group and connects the first cell 53 and the second cell 54, which are staggered, in series.

[0052] In some embodiments, such as Figure 1 As shown, the acquisition component 20 includes an acquisition element 2 and an acquisition cable harness 7. Each acquisition element 2 is soldered to the second connecting section 132 of the acquisition connection part 13 of a connecting bus 1. The acquisition element 2 can be a nickel sheet, and the connecting bus 1 can be an aluminum bus. The thickness of the nickel sheet is less than the thickness of the aluminum bus to prevent the high-energy laser used for welding from breaking down the connecting bus 1.

[0053] In some embodiments, such as Figure 1 , Figure 2 as well as Figure 6 As shown, the bus assembly 100 includes multiple connection busbars 1 and two output busbars 3. The two output busbars 3 are a positive output busbar 301 and a negative output busbar 302, respectively. Both the positive output busbar 301 and the negative output busbar 302 include a base portion 31, a second acquisition connection portion 32, and a fixing portion 33. The base portion 31 of the positive output busbar 301 is connected to the positive terminal 55 of the first battery cell 53 or the second battery cell 54, and the base portion 31 of the negative output busbar 302 is connected to the negative terminal 56 of the first battery cell 53 or the second battery cell 54. The second acquisition connection part 32 connects the base part 31 and the acquisition element 2. The second acquisition connection part 32 includes a third connection section 321 and a fourth connection section 322 that are bent and connected. The third connection section 321 connects the base part 31 and the fourth connection section 322. The fourth connection section 322 is bent and located on the side of the first cell group 51 so that the acquisition element 2 can be connected to the positive output line 301 or the negative output line 302. The fixing part 33 is bent relative to the base part 31 so that the fixing part 33 can be fixed to the fixing bracket 6.

[0054] In some embodiments, such as Figure 1 and Figure 2 As shown, the battery pack includes two fixing brackets 6, each including a first fixing bracket 61 and a second fixing bracket 62. The first fixing bracket 61 is fixed to one end of the first cell group 51 and the second cell group 52, and the second fixing bracket 62 is fixed to the other end of the first cell group 51 and the second cell group 52. The first fixing bracket 61 and the second fixing bracket 62 are adapted to fix the first cell group 51 and the second cell group 52.

[0055] In some embodiments, the main body 10 of the connecting row 1 and the first connecting segment 131 of the first acquisition connecting part 13 are each provided with a plurality of first positioning holes 15, and the connecting row 1 is fixed to the fixing bracket 6 through the plurality of first positioning holes 15. The base 31 of the output row and the third connecting segment 321 of the second acquisition connecting part 32 are each provided with a plurality of second positioning holes 35, and the output row is fixed to the fixing bracket 6 through the plurality of second positioning holes 35.

[0056] In some embodiments, the acquisition component 20 is configured as a wire harness type acquisition component. Compared with related technologies, where acquisition components include acquisition wire harnesses and FPC (Flexible Printed Circuit) or FFC (Flexible Flat Cable), the acquisition components have a wider variety of materials. The embodiments of this application use a wire harness type acquisition component, which is easier to assemble. The wire harness type acquisition component includes an acquisition element 2 and an acquisition wire harness 7. The acquisition wire harness 7 is fixed to the side of the first cell group 51 by a fixing strap 8. The acquisition element 2 connects the connection bar 1 and the acquisition wire harness 7, or the acquisition element 2 connects the output bar 3 and the acquisition wire harness 7. The voltage between the first cell 53 and the second cell 54 acquired by the acquisition element 2 is transmitted to the battery pack management system through the acquisition wire harness 7. The voltage of the positive terminal 55 of the second cell 54 connected to the positive output bar 301 and the voltage of the negative terminal 56 of the second cell 54 connected to the negative output bar 302 acquired by the acquisition element 2 are also transmitted to the battery pack management system through the acquisition wire harness 7.

[0057] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A bus assembly for connecting at least two battery cell groups and a data acquisition assembly (20), wherein the at least two battery cell groups include a first battery cell group (51) and a second battery cell group (52), the first battery cell group (51) includes at least one first battery cell (53), and the second battery cell group (52) includes at least one second battery cell (54), characterized in that, The bus assembly includes: At least one connecting bar assembly, the connecting bar assembly including at least one connecting bar (1), the connecting bar (1) including a main body (10), the main body (10) including a first cell connecting sub-part (11), a middle connecting sub-part (14) and a second cell connecting sub-part (12) connected in sequence, the first cell connecting sub-part (11) being adapted to be electrically connected to the first cell (53), and the second cell connecting sub-part (12) being adapted to be electrically connected to the second cell (54); The connecting row (1) further includes a data acquisition connecting part (13), which is connected to the middle connecting sub-part (14) so ​​that the middle connecting sub-part (14) is electrically connected to the data acquisition component (20) through the data acquisition connecting part (13).

2. The bus assembly according to claim 1, characterized in that, The acquisition connection part (13) includes a first connection segment (131) and a second connection segment (132). The middle connection sub-part (14) is electrically connected to the acquisition component (20) in sequence through the first connection segment (131) and the second connection segment (132). The second connection segment (132) is bent and connected to the first connection segment (131), and the extension direction of the second connection segment (132) has an angle with the surface of the main body (10) facing the battery pack.

3. The bus assembly according to claim 1, characterized in that, The fusing current of the acquisition connection part (13) is less than the fusing current of the main body part (10).

4. The bus assembly according to claim 3, characterized in that, The acquisition connection part (13) includes a first connection segment (131) and a second connection segment (132). The middle connection sub-part (14) is electrically connected to the acquisition component (20) in sequence through the first connection segment (131) and the second connection segment (132). The width of the first connection segment (131) is smaller than the width of the main body (10), or the thickness of the first connection segment (131) is smaller than the thickness of the main body (10).

5. A battery pack, characterized in that, The battery pack includes a bus assembly as described in any one of claims 1 to 4, at least two battery cell groups, and a data acquisition component (20), wherein the bus assembly connects at least two battery cell groups and the data acquisition component (20).

6. The battery pack according to claim 5, characterized in that, The dimensions of the first cell (53) and / or the second cell (54) in a first direction of the battery pack are smaller than the dimensions of the first cell (53) and / or the second cell (54) in a second direction of the battery pack, wherein the first direction is the height direction of the battery pack and the second direction is perpendicular to the first direction.

7. The battery pack according to claim 6, characterized in that, The first battery cell group (51) and the second battery cell group (52) are stacked in the first direction, and a plurality of first battery cells (53) of the first battery cell group (51) and a plurality of second battery cells (54) of the second battery cell group (52) are arranged along the second direction.

8. The battery pack according to claim 7, characterized in that, The busbar assembly includes two connection busbar assemblies, each including a first connection busbar assembly (101) and a second connection busbar assembly (102). The first connection busbar assembly (101) is electrically connected to one end of the first battery cell group (51) and the second battery cell group (52), and the second connection busbar assembly (102) is electrically connected to the other end of the first battery cell group (51) and the second battery cell group (52), so that a plurality of first battery cells (53) and a plurality of second battery cells (54) are connected in series.

9. The battery pack according to claim 8, characterized in that, In at least one first cell (53) and at least two second cells (54) corresponding to at least one first cell (53), one end of at least one first cell (53) is connected to one end of at least one of the at least two second cells (54) through the corresponding connection bar (1) of the first connection bar assembly (101), and the other end of at least one first cell (53) is connected to the other end of at least one of the at least two second cells (54) through the corresponding connection bar (1) of the second connection bar assembly (102).

10. The battery pack according to claim 9, characterized in that, One end of at least one of the first cells (53) has a polarity opposite to one end of at least one of the second cells (54); and / or, the other end of at least one of the first cells (53) has a polarity opposite to the other end of at least one of the second cells (54).

11. The battery pack according to claim 9, characterized in that, The extension direction of the main body portion (10) of the connecting row (1) of the first connecting row assembly (101) intersects the extension direction of the main body portion (10) of the connecting row (1) of the second connecting row assembly (102).

12. The battery pack according to claim 5, characterized in that, The acquisition connection part (13) of the connection row (1) includes a first connection segment (131) and a second connection segment (132). The first connection segment (131) extends along the height direction of the battery pack. The extension direction of the main body (10) of the connection row (1) has a first angle with the height direction of the battery pack. The first angle is greater than or equal to 0°. The extension direction of the second connection segment (132) has a second angle with the height direction of the battery pack. The second angle is greater than the first angle.

13. The battery pack according to claim 5, characterized in that, The acquisition component (20) includes a wire harness type acquisition component.

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