Busbar assembly and battery pack

Abstract

The utility model provides a busbar assembly and a battery pack. The busbar assembly comprises a busbar and a limiting piece, wherein the busbar comprises a protruding part and two battery cell connecting parts, the protruding part comprises a base plate and two protruding edges, the two protruding edges are connected to the two opposite sides of the base plate and arranged on the base plate in a protruding mode in the same direction, and the two battery cell connecting parts are located on the two sides of the protruding part and connected to the ends, away from the base plate, of the protruding edges respectively; and the two battery cell connecting parts are used for electrically connecting electrodes of different battery cells respectively. The limiting piece is detachably connected to the protruding part and used for connecting the sampling wire harness to the protruding part, and the length of the protruding part is 10%-20% of the length of the busbar in the length direction of the busbar. By means of the structural design, the surface of the protruding part can have enough plane space for bearing the sampling wire harness and the connection limiting piece, the connection firmness between the sampling wire harness and the protruding part can be improved, the wire harness can continuously and accurately monitor information of a battery cell, and therefore the technical problem of inaccurate monitoring is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a busbar assembly and a battery pack. Background Art

[0002] In the related art, the monitoring of some working condition information (voltage, temperature, humidity, etc.) of the battery pack, such as the monitoring of the battery pack voltage, is achieved by using a pressure collection harness to electrically connect the battery cells of the battery pack and monitor the voltage of the battery cells. Among them, the harness and the battery cells need to be fixed, and a conductive sheet for collecting voltage is provided at the end of the harness. The harness is electrically connected to the bus through the conductive sheet provided at its end, and the bus is electrically connected to the two battery cells. Therefore, the voltage parameters of the battery cells can be collected through the pressure collection harness during the operation of the battery pack. However, there are some problems with the bus in the related art. For example, the unreasonable structural design of the bus makes the connection between the pressure collection harness and the bus unreliable, resulting in the defect of often being unable to accurately monitor in the process of monitoring the battery cells. Utility Model Content

[0003] The embodiments of the utility model provide a bus assembly and a battery pack, which can improve the technical problem of unreliable connection between the wiring harness and the bus.

[0004] In a first aspect, an embodiment of the utility model provides a busbar assembly, the busbar assembly comprising:

[0005] A busbar, comprising a protruding portion and two cell connecting portions, wherein the protruding portion comprises a substrate and two protruding edges, wherein the two protruding edges are connected to two opposite sides of the substrate and protrude from the substrate in the same direction; the two cell connecting portions are located on both sides of the protruding portion and are respectively connected to one end of the protruding edge away from the substrate, and the two cell connecting portions are used to electrically connect electrodes of different cells respectively;

[0006] A stopper, used to connect the sampling harness to the protruding portion, and detachably connected to the protruding portion;

[0007] Along the length direction of the busbar, the length of the protrusion is 10% to 20% of the length of the busbar.

[0008] In one embodiment, along the thickness direction of the busbar, the cell connection portion is provided with a through hole and an annular groove.

[0009] The battery cell connecting portion includes a first side facing away from the battery cell, the annular groove is arranged on the first side of the battery cell connecting portion, and the annular groove is arranged around the through hole.

[0010] In one embodiment, the battery cell connecting portion includes a first portion forming the bottom of the annular groove and a second portion adjacent to the first portion, the thickness of the first portion is less than the thickness of the second portion, the thickness of the first portion is 1.5 mm to 2.5 mm, and the thickness of the second portion is 2 mm to 4 mm.

[0011] In one embodiment, the diameter of the through hole is 5 mm to 10 mm.

[0012] In one embodiment, in the thickness direction of the busbar, the distance from the substrate to the cell connecting portion is 4 mm to 6 mm.

[0013] In one embodiment, the base plate is provided with a threaded hole, an escape space is formed between the base plate and the two protruding edges, and the threaded hole is connected to the escape space;

[0014] The limiting member comprises a limiting end and a limiting column, wherein the limiting end is arranged on a side of the base plate away from the avoidance space, the limiting column is provided with a thread, and the limiting column is screwed to the threaded hole to penetrate the base plate.

[0015] In some embodiments, the length of the limiting column in the avoidance space is 1 mm to 3 mm.

[0016] In one embodiment, the busbar assembly further includes a gasket; the gasket is disposed between the limit end and the substrate, and is used to be disposed between the limit end and the sampling harness.

[0017] In a second aspect, an embodiment of the present utility model provides a battery pack, comprising:

[0018] Sampling harness;

[0019] A battery pack, comprising a plurality of battery cells;

[0020] A bus assembly, the bus assembly is the bus assembly described in the present application, wherein the bus is used to electrically connect two different battery cells, and the limiter is connected to the sampling harness and is detachably connected to the bus.

[0021] In one embodiment, the sampling harness is provided with an end connected to the limiter, and the end is a ring terminal provided with a through opening; the limiter is passed through the ring terminal and the bus to connect the sampling harness to the battery cell.

[0022] In one embodiment, the sampling harness is provided with an end connected to the limiter, and the end is a fork-shaped terminal with a notch; the limiter is passed through the fork-shaped terminal and the bus to connect the sampling harness to the battery cell.

[0023] Beneficial effects of the embodiments of the utility model:

[0024] In an embodiment of the utility model, the busbar includes a protrusion and two battery cell connection parts, and the protrusion is higher than the two battery cell connection parts, so that the sampling harness can be conveniently connected, and the limiter can be conveniently fixed to the sampling harness on the protrusion. The length of the protrusion is 10% to 20% of the length of the busbar, thereby meeting the plane space requirements required for the protrusion to connect the limiter, so that the surface of the protrusion has enough plane space to carry the sampling harness and the connection limiter, improve the connection reliability between the sampling harness and the protrusion, reduce the occurrence of short circuits and leakage, and enable the harness to continuously and accurately monitor the information of the battery cell, thereby improving the technical problem of inaccurate monitoring caused by unreliable connection between the harness and the busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of one side of a busbar assembly provided in an embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of another side of the busbar assembly provided in an embodiment of the utility model;

[0028] Figure 3 It is an exploded schematic diagram of a busbar assembly provided in an embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of a busbar provided in an embodiment of the utility model;

[0030] Figure 5 It is a structural schematic diagram of a position limiting member provided in an embodiment of the utility model;

[0031] Figure 6 It is a structural schematic diagram of a pressure collection harness provided by an embodiment of the utility model.

[0032] Explanation of the accompanying drawings: 1. bus assembly; 10. bus; 11. protrusion; 111. substrate; 112. protruding edge; 113. threaded hole; 12. battery cell connection portion; 121. through hole; 122. ring groove; 1201. first part; 1202. second part; 13. avoidance space; 20. limit member; 21. limit end; 22. limit column; 30. gasket; 3. sampling harness. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] In the related art, the monitoring of some working condition information of the battery pack, such as voltage, temperature, humidity, etc., usually requires the use of a sampling harness. Taking the monitoring of the voltage of the battery pack as an example, a pressure sampling harness can be used to electrically connect the battery cells of the battery pack. During the operation of the battery pack, the pressure sampling harness can continuously obtain monitoring information and transmit the acquired monitoring information to the processing terminal in the form of an electrical signal. When the battery pack is specifically assembled, one of the steps includes fixing the pressure sampling harness to the battery cell so that an electrical connection is established between the pressure sampling harness and the battery cell. In order to fix the pressure sampling harness to the battery cell, a conductive sheet for electrically connecting to the battery cell is provided at the end of the pressure sampling harness. The harness is electrically connected to the bus through the conductive sheet provided at its end, and the bus is electrically connected to the two battery cells. Therefore, during the operation of the battery pack, the voltage parameters of the battery cell can be collected through the pressure sampling harness. However, there are some problems with the bus in the related technology. For example, the unreasonable structural design of the bus often leads to problems of false connection and insufficient contact between the voltage collection harness and the bus, making the connection unreliable and easy to loosen. Moreover, due to the gap between the contacts, the voltage will break through the air gap to form an arc when it is large enough, resulting in short circuit and leakage, making it impossible to continuously and accurately monitor the working process of the battery cell.

[0035] Based on the problems that arise when monitoring the operating condition information of a battery pack, an embodiment of the present application proposes a bus assembly that can solve at least some of the problems that arise during the process of monitoring the battery pack.

[0036] See also Figures 1 to 3 , Figure 1 is a schematic diagram of the structure of one side of a busbar assembly provided in an embodiment of the present application, Figure 2 is a schematic diagram of the structure of another side of the bus assembly provided in an embodiment of the present application, Figure 3It is an exploded schematic diagram of the bus assembly provided in the embodiment of the present application. The bus assembly 1 provided in the present application is used to connect the end of the sampling harness 3, and the bus assembly 1 includes a bus 10 and a stopper 20. Among them, the bus 10 is used to electrically connect two different battery cells. The bus 10 may include a protruding portion 11 and two battery cell connecting portions 12. The protruding portion 11 includes a substrate 111 and two protruding edges 112. The two protruding edges 112 are connected to the opposite sides of the substrate 111 and protrude from the substrate 111 in the same direction. The two battery cell connecting portions 12 are located on both sides of the protruding portion 11 and are respectively connected to one end of a protruding edge 112 away from the substrate 111. The two battery cell connecting portions 12 are used to electrically connect the electrodes of different battery cells respectively. The stopper 20 is used to connect the sampling harness 3 to the bus 10, so that the sampling harness 3 can collect some information parameters of the battery cell under working conditions, such as voltage, current, temperature, humidity, etc., through the bus 10. For example, the stopper 20 can be used to connect the sampling harness 3 to the protrusion 11, and can be detachably connected to the protrusion 11. Along the length direction of the bus 10, the length of the protrusion 11 can be 10% to 20% of the length of the bus 10.

[0037] In an embodiment of the utility model, the busbar includes a protruding portion and two battery cell connecting portions, wherein the protruding portion is higher than the two battery cell connecting portions, thereby facilitating connection of the sampling harness and facilitating the fixing of the sampling harness to the protruding portion by a limiting member. The length of the protrusion 11 is set to 10% to 20% of the length of the bus 10. One advantage is that it can meet the planar space requirement for the protrusion 11 to connect to the limit piece 20, so that the surface of the protrusion 11 has sufficient planar space to carry the sampling harness and the connection limit piece 20, which can improve the connection reliability between the sampling harness 3 and the protrusion 11, reduce the occurrence of short circuits and leakage, and enable the harness to continuously and accurately monitor the working condition information of the battery cell, thereby improving the technical problem of inaccurate monitoring caused by unreliable connection between the harness and the bus. Another advantage is that it can take into account the contact area between the cell connection part 12 and the cell when the cell connection part 12 is connected to the cell pole, so that the cell connection part and the cell pole are fully in contact, thereby meeting the welding strength, achieving the effect of improving the reliability of the electrical connection between the cell connection part and the cell, and improving the electrical contact performance between the bus and the cell.

[0038] See also Figure 4 , Figure 4Schematic diagram of the structure of the busbar 10 provided in the embodiment of the present application. The busbar 10 provided in the embodiment of the present application, along the thickness direction of the busbar 10, the battery cell connection portion 12 is provided with a through hole 121 and an annular groove 122, the battery cell connection portion 12 includes a first side 120 away from the battery cell, the annular groove 122 is arranged on the first side 120 of the battery cell connection portion 12, and the annular groove 122 is arranged around the through hole 121. The advantages of such a design are that, on the one hand, in the process of using the busbar 10 provided in the embodiment of the present application to electrically connect two battery cells, the through hole 121 can be used to ensure that the welding position between the busbar and the battery cell is accurate before welding the busbar and the battery cell pole, and when welding the busbar to the battery cell pole, the through hole 121 can make it easier to complete the welding operation between the busbar 10 and the battery cell pole, thereby reducing the occurrence of welding defects. On the other hand, by means of the annular groove 122 arranged around the through hole 121, the portion of the busbar 10 used for welding to the battery cell pole can form a thinner area, which is beneficial to improve the welding strength between the busbar 10 and the battery cell pole, thereby ensuring the connection reliability between the busbar and the battery cell.

[0039] In some embodiments, the cell connection part 12 can be divided into two parts according to the thickness of the cell connection part 12. Specifically, the cell connection part 12 can include a first part 1201 forming the bottom of the annular groove 122 and a second part 1202 adjacent to the first part 1201, and the thickness of the first part 1201 is less than that of the second part 1202. In the process of realizing the implementation mode of the present application, the inventors found that, when the thickness of the battery cell connection part 12 of the busbar 10 is thicker, the welding power required for welding the battery cell connection part 12 to the battery cell will be higher, and the corresponding welding cost will be higher. However, when the thickness of the busbar 10 is too small, it may cause the welding strength of the battery cell connection part 12 to be insufficient (for example, insufficient pulling force or shear force), resulting in the battery cell connection part 12 used for connecting to the battery cell. The part is prone to defects such as breakage and desoldering. In response to the above-mentioned defects, the inventors found after long-term experiments that if the thickness of the first part 1201 is set to 1.5mm~2.5mm and the thickness of the second part 1202 is set to 2mm~4mm, it is beneficial to improve the firmness of the busbar 10 and the battery cell pole after welding, thereby ensuring good electrical contact between the busbar 10 and the battery cell, and finally enabling the sampling harness 3 to continuously collect some operating parameters of the battery cell. Specifically, the thickness of the second portion 1202 may be set to 2 mm to 3 mm, or 3 mm to 4 mm, and the thickness of the first portion 1201 may be set to 1.5 mm to 2 mm, or 2 mm to 2.5 mm. For example, the thickness of the second part 1202 can be 2 mm, and correspondingly, the thickness of the first part 1201 can be 1.5 mm, or the thickness of the second part 1202 can be 3 mm or 4 mm, and correspondingly, the thickness of the first part 1201 can be 1.5 mm, 2 mm, or 2.5 mm. Of course, the values ​​of the first part 1201 and the second part 1202 can also be any other suitable values ​​within the above-mentioned corresponding thickness ranges, as long as the value representing the thickness of the first part 1201 is smaller than the value representing the thickness of the second part 1202 among the two selected values. In addition, the inventors also found during the experiment that in order to prevent the through hole 121 from being inconvenient to observe during welding due to its small aperture and causing the welding quality to deteriorate due to its large aperture, the aperture of the through hole 121 can be set to 5 mm to 10 mm. Such a design can be more conducive to the operator's welding of the bus 10 and reduce welding defects.

[0040] In some embodiments, in the thickness direction of the busbar 10, the distance from the substrate 111 to the cell connection portion 12 can be set to 4 mm to 6 mm, so that there is a suitable avoidance distance between the substrate 111 and the cell connection portion 12. Such a design allows the end of the limiter 20 used to connect the busbar to extend toward the cell by a preset length after the limiter 20 is connected to the protrusion 11, thereby enabling the limiter 20 to be firmly connected to the protrusion 11, thereby preventing the limiter 20 from loosening and effectively preventing the end of the limiter 20 from piercing the cell. It should be noted that the avoidance distance from the substrate 111 to the cell connection portion 12 in this specification refers to the distance between the surface of the substrate 111 facing the avoidance space 13 and the first side 120 of the cell connection portion 12. In the process of implementing the implementation scheme of the present application, the inventors found through long-term experiments that when the avoidance distance between the substrate 111 and the battery cell connecting portion 12 is set to 4mm~6mm, it can prevent the protrusion 11 from being too large to cause the overall height control of the battery pack to be unfavorable, and prevent the protrusion 11 from being insufficiently protruding to make it unable to meet the permitted distance between the end of the limit member 20 and the battery cell. Specifically, the distance between the substrate 111 and the battery cell connecting portion 12 can be set to 4mm~5mm, or it can be set to 5mm~6mm. In some embodiments, the distance between the substrate 111 and the battery cell connecting portion 12 can be set to any value of 4mm, 4.5mm, 5mm, 5.5mm, and 6mm, and of course it can also be any other suitable value within the range of 4mm~6mm. These values ​​can make the protrusion of the protrusion 11 have a reasonable range, thereby avoiding design problems caused by improper protrusion height.

[0041] In the embodiment of the present application, the bus 10 can be an aluminum bus or a copper bus. In the embodiment of the present application, at least a portion between the two battery cell connecting portions 12 of the bus 10 is protruded by a preset height so that the portion is formed into a protrusion 11. Therefore, under the working environment, the bus 10 can alleviate the expansion force generated by heat and the contraction force generated by cooling during the working process of the two battery cells electrically connected together through the protrusion 11, that is, the protrusion 11 can allow the battery cells under working conditions to produce a certain deformation, and can also alleviate the stress in the welding area between the bus 10 and the battery cell pole, thereby reducing the risk of the bus 10 loosening.

[0042] See also Figure 4 In some embodiments, the base plate 111 may be provided with a threaded hole 113, and an escape space 13 is formed between the base plate 111 and the two protruding edges 112, and the threaded hole 113 is connected to the escape space 13. Figure 2 and Figure 5 , Figure 5A schematic diagram of the structure of the limiter provided in the embodiment of the present application. The limiter 20 includes a limit end 21 and a limit post 22, wherein the limit end 21 is provided on the side of the substrate 111 away from the avoidance space 13, the limit end 21 is used to make the end of the sampling harness 3 close to the surface of the side of the substrate 111 away from the avoidance space 13, the limit post 22 is used to connect the sampling harness 3 and assist the limit end 21 to establish contact between the sampling harness 3 and the bus 10, so that the sampling harness 3 can obtain some information parameters of the battery cell under working conditions in real time through the bus 10, the limit post 22 is provided with a thread, the limit post 22 is screwed to the threaded hole 113 and penetrates the substrate 111, and the length of the limit post 22 in the avoidance space 13 is 1mm to 3mm. In the embodiment of the present application, a threaded hole 113 is opened on the substrate 111 and the threaded hole 113 is connected to the avoidance space 13, and the limiting column 22 is screwed into the threaded hole 113 opened on the substrate 111. Therefore, after the limiting member 20 is connected to the substrate 111, the limiting member 20 can pass through at least a part of its length in the direction of the avoidance space 13, so that the limiting member 20 can be firmly connected to the substrate 111. The length of the limiting member 20 passing through the avoidance space 13 can be effectively controlled to be within the permitted range through the avoidance space 13, thereby avoiding the situation where the battery cell is damaged by the limiting member 20. In the process of implementing the embodiments of the present application, the inventors also found after long-term experiments that if the extension length range of the limit column 22 of the limit member 20 in the avoidance space 13 is set to 1mm~3mm, the connection reliability of the limit member 20 can be ensured under the premise of avoiding breakdown of the battery cell. For example, in some embodiments, the extension length range of the limit column 22 in the avoidance space 13 can be set to 1mm~2mm, or 2mm~3mm. Specifically, in some embodiments, the extension length of the limit column 22 of the limit member 20 in the avoidance space 13 can be set to any value of 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, and of course it can also be any other value within the range of 1mm~3mm, both of which can ensure that the limit column 22 of the limit member 20 has a reasonable extension length in the avoidance space 13. These extension length ranges can avoid a series of connection defects caused by the limit column 22 extending too long or too short in the avoidance space 13.

[0043] Exemplarily, the limiter 20 provided in the embodiment of the present application can be a bolt or a screw. This specification uses a bolt as an example for schematic description. The implementation of the bolt can be applicable to screws, so the design of connecting the sampling harness 3 with a screw is no longer separately described in detail. Usually, the bolt includes a screw head and a screw rod. The screw head is arranged at one end of the screw rod. In this embodiment, the screw head can be used as a limit end 21 of the limiter 20 to limit the sampling harness 3, and the screw rod can be used as a limit column 22 to connect the sampling harness 3. It is understandable that the limiter 20 can also be a threaded connection pair formed by connecting a stud and a nut. In this embodiment, the nut is screwed to one end of the stud. The nut can be used as a limit end 21 to limit the harness, and the screw rod can be used as a limit column 22 to connect the sampling harness 3.

[0044] See also Figure 3 and Figure 6 , Figure 6 A schematic diagram of the structure of the sampling harness provided in the embodiments of the present application. In some embodiments of the present application, the busbar assembly 1 may further include a gasket 30 , which is disposed between the limit end 21 and the substrate 111 , and is used to be disposed between the limit end 21 and the sampling harness 3 .

[0045] Exemplarily, the sampling harness 3 includes an end. In the sampling harness used to obtain the battery cell temperature or battery cell voltage, the end of the sampling harness 3 can be a conductive structure or a thermally conductive structure. Accordingly, the gasket 30 can be made of a conductive or thermally conductive material such as aluminum, copper or other suitable materials with good conductive or thermal conductive properties. When the bus assembly 1 is used to connect the end of the sampling harness 3, it is necessary to first clamp the end of the sampling harness 3 between the gasket 30 and the substrate 111. The end of the sampling harness 3 is within the coverage range of the gasket 30, thereby allowing the end of the sampling harness 3 and the gasket 30 to have a larger contact area, thereby ensuring monitoring accuracy. When the sampling harness is a pressure sampling harness, the gasket can also effectively slow down the oxidation rate of the end of the sampling harness 3. The bus assembly 1 provided in this embodiment can prevent the limiter 20 from twisting back by arranging the gasket 30 between the limit end 21 and the substrate 111, and arranging the end of the sampling harness 3 between the gasket 30 and the substrate 111, thereby increasing the contact area of ​​the end of the sampling harness 3, thereby facilitating improving the monitoring accuracy.

[0046] The present application also provides a battery pack (not fully shown in the figure), which includes a busbar assembly 1 provided in an embodiment of the present application, a sampling harness 3 provided in any embodiment of the present application, and a battery pack (not shown in the figure). The battery pack includes a plurality of cells, the busbar 10 is used to electrically connect two different cells, and the stopper 20 is connected to the sampling harness 3 and is detachably connected to the busbar 10.

[0047] In some embodiments, the sampling harness 3 is provided with an end connected to a limit member 20, and the end may be a ring terminal with a through opening, and the limit member 20 is passed through the ring terminal and the bus 10 to connect the sampling harness 3 to the battery cell, or the end may be a fork-shaped terminal with a notch (not shown), and the limit member 20 is passed through the fork-shaped terminal and the bus 10 to connect the sampling harness 3 to the battery cell.

[0048] When connecting the end of the sampling harness 3 as one of the optional connection methods, first, the through-hole of the ring terminal of the sampling harness 3 or the recess of the fork terminal of the sampling harness 3 can be aligned with the threaded hole 113 of the substrate, and then the limiting column 22 of the limiting member 20 is passed through the through hole of the washer with one end having a thread, and then the limiting column is continued to be passed through the through-hole of the ring terminal or the recess of the fork terminal with one end having a thread and then screwed to the threaded hole 113 of the bus 10. Finally, the limiting member is properly tightened to connect the sampling harness 3 to the bus, so that the sampling harness 3 can sense the operating parameters of the battery cell in real time.

[0049] It is understandable that the battery pack may be a lithium battery pack or other types of battery packs, and the embodiments of the present application do not limit the type of battery pack.

[0050] In summary, compared with the busbar assembly and battery pack in the related art, the busbar assembly and battery pack provided by the embodiments of the present application have the following beneficial effects: first, by setting the length of the protrusion to 10% to 20% of the length of the busbar, on the one hand, the planar space requirement required for the protrusion to connect the limiter can be met, so that the surface of the protrusion has sufficient planar space to carry the end of the sampling harness and the connection limiter, which has the effect of improving the connection reliability between the sampling harness and the protrusion, so that the harness can continuously and accurately monitor the working condition information of the battery cell, thereby improving the technical problem of inaccurate monitoring caused by the unreliable connection between the harness and the busbar; second, by designing the annular groove arranged around the through hole, the busbar can be The portion used for welding with the battery cell pole forms a thinner area, which is beneficial to improving the welding reliability between the bus and the battery cell pole; thirdly, by setting a suitable avoidance distance between the substrate and the battery cell connecting part, the limiter can be connected to the protrusion. The limiter can extend a preset length toward the battery cell, so that the limiter can be firmly connected to the protrusion, avoiding the limiter from loosening and effectively preventing the limiter from piercing the battery cell; fourthly, by arranging a gasket between the limiter end and the substrate, and arranging the end of the sampling harness between the gasket and the substrate, the limiter can play an anti-twisting role, and the contact area of ​​the end of the sampling harness can be increased, thereby improving the sensing accuracy of the sampling harness.

[0051] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A busbar assembly, characterized in that: The busbar assembly comprises: A busbar, comprising a protruding portion and two cell connecting portions, wherein the protruding portion comprises a substrate and two protruding edges, wherein the two protruding edges are connected to two opposite sides of the substrate and protrude from the substrate in the same direction; the two cell connecting portions are located on both sides of the protruding portion and are respectively connected to one end of the protruding edge away from the substrate, and the two cell connecting portions are used to electrically connect electrodes of different cells respectively; A stopper, used to connect the sampling harness to the protruding portion, and detachably connected to the protruding portion; Along the length direction of the busbar, the length of the protrusion is 10% to 20% of the length of the busbar.

2. The busbar assembly according to claim 1, characterized in that: Along the thickness direction of the busbar, the cell connection portion is provided with a through hole and an annular groove. The battery cell connecting portion includes a first side facing away from the battery cell, the annular groove is arranged on the first side of the battery cell connecting portion, and the annular groove is arranged around the through hole.

3. The busbar assembly according to claim 2, characterized in that: The cell connection portion includes a first portion forming the bottom of the annular groove and a second portion adjacent to the first portion, the thickness of the first portion is less than that of the second portion, the thickness of the first portion is 1.5 mm to 2.5 mm, and the thickness of the second portion is 2 mm to 4 mm.

4. The busbar assembly according to claim 2 or 3, characterized in that: The through hole has a diameter of 5 mm to 10 mm.

5. The busbar assembly according to any one of claims 1 to 3, characterized in that: In the thickness direction of the busbar, the distance from the substrate to the cell connecting portion is 4 mm to 6 mm.

6. The busbar assembly according to claim 5, characterized in that: The base plate is provided with a threaded hole, an escape space is formed between the base plate and the two protruding edges, and the threaded hole is connected to the escape space; The limiting member comprises a limiting end and a limiting column, wherein the limiting end is arranged on a side of the base plate away from the avoidance space, the limiting column is provided with a thread, and the limiting column is screwed to the threaded hole to penetrate the base plate.

7. The busbar assembly according to claim 6, characterized in that: The length of the limiting column in the avoidance space is 1 mm to 3 mm.

8. The busbar assembly according to claim 6, characterized in that: The busbar assembly further comprises a gasket; the gasket is arranged between the limit end and the base plate, and is used to be arranged between the limit end and the sampling harness.

9. A battery pack, characterized in that: include: Sampling harness; A battery pack, comprising a plurality of battery cells; A bus assembly, wherein the bus assembly is a bus assembly as described in any one of claims 1 to 8, wherein the bus is used to electrically connect two different battery cells, and the limiter is connected to the sampling harness and is detachably connected to the bus.

10. The battery pack according to claim 9, characterized in that: The sampling harness is provided with an end connected to the stopper, and the end is a ring terminal provided with a through opening; the stopper is passed through the ring terminal and the bus bar to connect the sampling harness to the battery cell.

11. The battery pack according to claim 9, characterized in that: The sampling harness is provided with an end connected to the limiting member, and the end is a fork-shaped terminal provided with a notch; the limiting member is passed through the fork-shaped terminal and the bus bar to connect the sampling harness to the battery cell.

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