Busbars and battery packs

Abstract

This application relates to a busbar and a battery pack, and pertains to the field of battery technology. The busbar includes a first sheet, a second sheet, and a buffer section. The second sheet and the first sheet are spaced apart along a first direction. The buffer section is disposed between the first sheet and the second sheet, and includes at least two buffer members spaced apart along a second direction, connecting the first sheet and the second sheet. The width of the buffer members along the first direction is smaller than the width of the first sheet along the first direction, and the width of the buffer members along the first direction is smaller than the width of the second sheet along the first direction. This busbar and battery pack can promptly melt and disconnect the buffer section when some battery cells malfunction, thereby preventing safety accidents such as battery pack combustion and explosion.

Description

Technical Field

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

[0002] Currently, battery packs consist of multiple battery cells, with current flowing between adjacent cells via busbars. In related technologies, when one battery cell malfunctions (e.g., overcharging, over-discharging, short circuit), the busbar may not melt in time, potentially causing the other battery cell to malfunction simultaneously. This could easily lead to safety accidents such as battery pack combustion or explosion. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a busbar and a battery pack that can promptly melt and break the buffer section when some individual battery cells malfunction, thereby preventing safety accidents such as battery pack combustion and explosion.

[0004] Firstly, a bus is provided, including: The first piece; The second piece is distributed at intervals from the first piece along the first direction; A buffer section is disposed between the first piece and the second piece. The buffer section includes at least two buffer members spaced apart along a second direction. The buffer members connect the first piece and the second piece. The width of the buffer members along the first direction is smaller than the width of the first piece along the first direction, and the width of the buffer members along the first direction is smaller than the width of the second piece along the first direction. Wherein, the first direction represents the width direction of the busbar; the second direction represents the length direction of the busbar.

[0005] According to a first aspect of this application, a portion of the buffer protrudes relative to the surfaces of the first and second sheets in a third direction; wherein the third direction characterizes the thickness direction of the busbar.

[0006] According to a first aspect of this application, the portion of the buffer that protrudes from the surfaces of the first and second pieces has an arc-shaped structure.

[0007] According to a first aspect of this application, the height of the buffer protrusion relative to the surfaces of the first and second pieces is A, in mm; the thickness of the first and / or second pieces along the third direction is T, in mm; and A and T satisfy: 0.3 mm ≤ A ≤ 3 T.

[0008] According to a first aspect of this application, the first piece and / or the second piece are provided with positioning holes and mounting holes distributed along the second direction.

[0009] According to a first aspect of this application, the length of the buffer along the second direction is B, in mm; and B satisfies: 1 mm ≤ B ≤ 5 mm.

[0010] Secondly, a battery pack is also provided, comprising: Multiple battery cells; As described in the previous embodiment, the first and second panels are respectively connected to two adjacent battery cells.

[0011] According to a second aspect of this application, the battery cell comprises: The casing has an opening; An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode tabs; A cover plate is provided at one end of the electrode assembly, and the cover plate is connected to the housing to close the opening; An electrode assembly is disposed on the cover plate, one end of the electrode assembly is connected to the electrode tab, and the other end of the electrode assembly is connected to the first piece or the second piece.

[0012] According to a second aspect of this application, the width of the buffer along the first direction is G, in mm; the distance between the terminal assemblies of two adjacent battery cells along the first direction is H, in mm; and G and H satisfy: 0.2≤G / H≤0.8.

[0013] According to a second aspect of this application, the distance between the buffer and the cover plate along a third direction is C, in mm; C satisfies: C≥0.5mm; wherein, the third direction characterizes the thickness direction of the busbar.

[0014] The busbar and battery pack provided in this application embodiment have at least two buffers between the first and second cells. On the one hand, by making the width of the buffer along the first direction smaller than the width of the first cell along the first direction, and the width of the buffer along the first direction smaller than the width of the second cell along the first direction, the buffer can melt before the first and second cells when the battery cell malfunctions, thus blocking the current. On the other hand, by distributing at least two buffers at intervals along the second direction, the connection strength between the first and second cells can be guaranteed, and the physical length of the buffer part along the second direction can be shortened, so that the buffer can melt in time when the battery cell malfunctions, avoiding safety accidents such as battery pack combustion and explosion. Attached Figure Description

[0015] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 This is a schematic diagram of the structure of a battery pack provided for an exemplary embodiment of this application.

[0017] Figure 2 A partial cross-sectional view of a battery pack provided for an exemplary embodiment of this application.

[0018] Figure 3 A schematic diagram of the bus structure provided in an exemplary embodiment of this application from a first perspective.

[0019] Figure 4 A schematic diagram of the busbar structure provided in an exemplary embodiment of this application from a second perspective.

[0020] Reference numerals: 100-busbar; 110-first cell; 120-second cell; 130-buffer section; 131-buffer component; 140-positioning hole; 150-mounting hole; 200-battery pack; 210-cell battery; 211-casing; 212-pole assembly; 213-tab; 214-cover plate; 215-terminal post assembly. Detailed Implementation

[0021] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0022] Figure 1 This is a schematic diagram of the structure of a battery pack provided for an exemplary embodiment of this application. Figure 1 As shown in the embodiments of this application, the battery pack 200 may include a plurality of battery cells 210 and a bus 100, wherein the bus 100 may connect two adjacent battery cells 210. Two adjacent battery cells 210 may transmit current through the bus 100, thereby enabling two adjacent battery cells 210 to be connected in series or in parallel through the bus 100.

[0023] Figure 2 A partial cross-sectional view of a battery pack provided for an exemplary embodiment of this application. Figure 1 and Figure 2As shown, the battery cell 210 may include a housing 211 and an electrode assembly 212. The housing 211 has an opening through which the electrode assembly 212 can extend into the housing 211. The housing 211 can protect the electrode assembly 212.

[0024] like Figure 1 and Figure 2 As shown, the battery cell 210 may also include a cover plate 214, which is disposed at one end of the electrode assembly 212 and connected to the housing 211. The cover plate 214 can be used to close the opening of the housing 211. It should be understood that the cover plate 214 can prevent external foreign objects from entering the electrode assembly 212 through the opening, and the cover plate 214 can also protect the electrode assembly 212.

[0025] like Figure 1 and Figure 2 As shown, the battery cell 210 may further include a terminal assembly 215, which is disposed on the cover plate 214. The aforementioned electrode group 212 has a tab 213. One end of the terminal assembly 215 is connected to the tab 213, and the other end of the terminal assembly 215 is connected to the busbar 100. In practical applications, the busbar 100, the terminal assembly 215, and the electrode group 212 can be used to input current to the electrode group 212 and output current from the electrode group 212.

[0026] Figure 3 A schematic diagram of the bus structure provided in an exemplary embodiment of this application from a first perspective. Figure 4 A schematic diagram of the busbar structure provided in an exemplary embodiment of this application from a second perspective. (See diagram below.) Figures 2 to 4 As shown, the busbar 100 may include a first panel 110, a second panel 120, and a buffer section 130. The first panel 110 and the second panel 120 are along a first direction (which can be understood as the width direction of the busbar 100, see reference for details). Figures 2 to 4 The buffer section 130 is located between the first piece 110 and the second piece 120, and is distributed at intervals along the X-axis direction. The buffer section 130 connects the first piece 110 and the second piece 120.

[0027] It should be noted that for two adjacent battery cells 210, a busbar 100 is provided between the two adjacent battery cells 210. The first piece 110 and the second piece 120 are respectively connected to the two adjacent battery cells 210. Current is transmitted between the two adjacent battery cells 210 through the first piece 110, the buffer part 130 and the second piece 120.

[0028] It should be noted that for a single battery cell 210, the first piece 110 or the second piece 120 is connected to the end of the terminal assembly 215 away from the tab 213.

[0029] In related technologies, when one of the two adjacent battery cells 210 experiences an abnormal condition (such as overcharging, over-discharging, or short circuit), the buffer 130 cannot melt in time, which can easily cause the other battery cell 210 to experience an abnormal condition at the same time, and thus easily lead to safety accidents such as combustion or explosion of the battery pack 200.

[0030] The inventors discovered that the main reasons why the buffer section 130 cannot fuse in time are as follows: In order to ensure the connection strength between the first piece 110 and the second piece 120, it is necessary to extend the buffer section 130 along the second direction (which can be understood as the length direction of the busbar 100, see reference for details). Figure 3 and Figure 4 The length of the buffer part 130 in the Y-axis direction is such that it can securely connect the first piece 110 and the second piece 120 at different parts in the second direction; however, if the length of the buffer part 130 in the second direction is too long, the buffer part 130 may not be able to melt in time.

[0031] Therefore, such as Figure 3 and Figure 4 As shown, the buffer section 130 includes at least two components along the second direction (which can be understood as the length direction of the busbar 100, see reference for details). Figure 3 and Figure 4 Buffer elements 131 are spaced apart along the Y-axis direction in the first direction (reference). Figure 3 and Figure 4 The width of the buffer 131 along the X-axis direction is less than the width of the first piece 110 along the first direction, and the width of the buffer 131 along the first direction is less than the width of the second piece 120 along the first direction.

[0032] It should be noted that, since the buffer 131 is along the first direction (refer to...) Figure 3 and Figure 4 The width of the buffer 131 (in the X-axis direction) is smaller than the width of the first piece 110 along the first direction. Therefore, when a battery cell 210 malfunctions, the buffer 131 can melt before the first piece 110. Similarly, since the width of the buffer 131 along the first direction is smaller than the width of the second piece 120 along the first direction, when a battery cell 210 malfunctions, the buffer 131 can melt before the second piece 120.

[0033] It should be noted that since at least two buffers 131 are spaced apart along the second direction, different buffers 131 can be used to connect different parts of the first piece 110 and the second piece 120 along the second direction, which can ensure the connection strength between the first piece 110 and the second piece 120 and prevent the first piece 110 and the second piece 120 from separating from each other under normal circumstances.

[0034] Furthermore, while ensuring the connection strength between the first piece 110 and the second piece 120, at least two buffers 131 are spaced apart along the second direction. This shortens the physical length of the buffer portion 130 along the second direction, making it easier for the buffers 131 to melt and break when the battery cell 210 malfunctions.

[0035] That is, the busbar 100 and battery pack 200 provided in this application embodiment have at least two buffer members 131 between the first piece 110 and the second piece 120. On the one hand, by making the width of the buffer member 131 along the first direction smaller than the width of the first piece 110 along the first direction, and the width of the buffer member 131 along the first direction smaller than the width of the second piece 120 along the first direction, the buffer member 131 can melt before the first piece 110 and the second piece 120 when the battery cell 210 has an abnormal condition, so as to block the current. On the other hand, by distributing at least two buffer members 131 at intervals along the second direction, the connection strength between the first piece 110 and the second piece 120 can be guaranteed, and the physical length of the buffer part 130 along the second direction can be shortened, so that the buffer member 131 can melt in time when the battery cell 210 has an abnormal condition, thus avoiding safety accidents such as combustion and explosion of the battery pack 200.

[0036] In one embodiment, the first piece 110, the second piece 120, and the buffer 131 can be connected to each other by welding, stamping, or other means.

[0037] like Figure 2 and Figure 3 As shown, a portion of the buffer 131 is positioned relative to the surfaces of the first piece 110 and the second piece 120 along a third direction (which can be understood as the thickness direction of the busbar 100, see reference for details). Figure 2 and Figure 3 It protrudes in the Z-axis direction.

[0038] It should be noted that in practical applications, two adjacent battery cells 210 will expand during current transmission. During the expansion of the battery cell 210, the buffer 131 is subjected to the expansion tension of the two battery cells 210, and the distance between the first piece 110 and the second piece 120 along the first direction increases. The protruding part of the buffer 131 provides a buffer for the stretching process. That is, the protruding part of the buffer 131 relative to the first piece 110 and the second piece 120 can provide a buffering effect during the increase of the distance between the first piece 110 and the second piece 120, avoiding the problem of tearing or breaking of the buffer 131 after being subjected to tensile force. This helps to prevent abnormal connection between the two adjacent battery cells 210 and the busbar 100.

[0039] It should be noted that after the first piece 110 and the second piece 120 are respectively connected to the terminal assembly 215 of two adjacent battery cells 210, they are combined with... Figure 2 The aforementioned buffer 131 protruding in a third direction can be disposed between the terminal post assemblies 215 of the two battery cells 210. In this way, the space between the terminal post assemblies 215 of the two battery cells 210 can be fully utilized, thereby improving space utilization.

[0040] like Figure 2 and Figure 3 As shown, the portion of the buffer 131 that protrudes from the surfaces of the first piece 110 and the second piece 120 has an arc-shaped structure. This has two advantages: First, during the stretching process of the buffer 131, the arc-shaped structure helps to distribute the tensile force across the entire surface of the buffer 131, avoiding stress concentration and preventing cracking or breakage during stretching. Second, after being stretched slightly, the arc-shaped structure undergoes elastic deformation. As the expansion force of the battery cell 210 decreases, the buffer 131 can recover to its initial state through elastic deformation, facilitating repeated stretching and thus extending the service life of the buffer 131.

[0041] like Figure 2 As shown, the height of the buffer 131 protruding relative to the surfaces of the first piece 110 and the second piece 120 is A, in mm. Specifically, in Figure 2 From the perspective shown, height A can be understood as the distance between the bottom of the protruding portion of the buffer 131 relative to the surfaces of the first piece 110 and the second piece 120 and the surface of the first piece 110 (or the second piece 120) along a third direction.

[0042] like Figure 2 As shown, the thickness of the first piece 110 and / or the second piece 120 along the third direction is T.

[0043] It should be noted that if the height A is too small, the buffering effect of the protruding parts of the buffer member 131 relative to the surfaces of the first piece 110 and the second piece 120 will not be obvious. Under the expansion tension of the battery cell 210, the buffer member 131 is prone to cracking or breaking. If the height A is too large (A exceeds the thickness T by too much), the protruding parts of the buffer member 131 relative to the surfaces of the first piece 110 and the second piece 120 will not be easy to stamp and form, which will affect the processing efficiency.

[0044] Therefore, in this application embodiment, the height A is limited to the following range: 0.3mm≤A≤3T. This can effectively improve the problems caused by the aforementioned height A being too small or too large.

[0045] In one embodiment, the height A can be selected as 0.3mm, 1mm, 3T, etc.

[0046] like Figure 4 As shown, the first piece 110 and / or the second piece 120 are provided with positioning holes 140 and mounting holes 150 distributed along the second direction.

[0047] Specifically, before the busbar 100 is welded to the terminal assembly 215, the installation position of the busbar 100 can be determined by the positioning hole 140 and the corresponding positioning part (such as protrusion, bump, positioning frame, etc.) on the battery cell 210.

[0048] Specifically, the mounting hole 150 can be used to connect with other electrical components, making it easier for the bus 100 to establish an electrical connection with other electrical components.

[0049] In one embodiment, the first piece 110 and / or the second piece 120 are connected to the pole assembly 215, and the positioning hole 140 is located outside the coverage area of ​​the pole assembly 215 to avoid the pole assembly 215 affecting the positioning effect between the positioning hole 140 and the positioning part; the mounting hole 150 is located within the coverage area of ​​the pole assembly 215, so that other electrical components can be directly connected to the pole assembly 215 through the mounting hole 150.

[0050] like Figure 4 As shown, the buffer 131 is along the second direction (reference). Figure 4 The length of the buffer component 131 along the Y-axis is B, in mm. It should be noted that if the length B is too small, the buffer component 131 is prone to breakage during manufacturing, leading to processing difficulties; if the length B is too large, the buffer component 131 is not easy to melt, which may result in the buffer component 131 failing to melt in time when the battery cell 210 malfunctions, potentially causing a safety accident.

[0051] Therefore, in this embodiment of the application, the length B is limited to the following range: 1mm≤B≤5mm. This can effectively improve the problems caused by the aforementioned length B being too large or too small.

[0052] In one embodiment, the length B can be selected as 1mm, 2mm, 5mm, etc.

[0053] like Figure 2 As shown, the buffer 131 is along the first direction (reference). Figure 2The width (in the X-axis direction) is G, in mm; the distance between the terminal assemblies 215 of two adjacent battery cells 210 along the first direction is H, in mm. Regarding G / H, it should be noted that if G / H is too large, after the buffer 131 is placed between the terminal assemblies 215 of two adjacent battery cells 210, the buffer 131 is prone to interference with the terminal assembly 215, which may easily lead to a safety accident; if G / H is too small, on the one hand, if the distance H is too large, resulting in a small G / H, the distance between the two adjacent battery cells 210 along the first direction will be large, affecting the welding stability between the first piece 110 and the second piece 120 and the corresponding terminal assembly 215, and the first piece 110 and the second piece 120 may easily detach from the terminal assembly 215; on the other hand, if the distance G is too small, resulting in a small G / H, the buffer 131 will not achieve the aforementioned buffering effect.

[0054] Therefore, in this application embodiment, G / H is limited to the following range: 0.2≤G / H≤0.8. This can effectively improve the problems caused by G / H being too large or too small.

[0055] In one embodiment, G / H can be 0.2, 0.5, 0.8, etc.

[0056] like Figure 2 As shown, the buffer 131 and the cover plate 214 are along a third direction (reference). Figure 2 The spacing along the Z-axis (in the image) is C, in mm. It should be noted that if the spacing C is too small, it may cause interference between the buffer 131 and the battery cell 210, and the battery cell 210 may be scratched by the buffer 131.

[0057] Therefore, in this embodiment of the application, the spacing C is limited to the following range: C≥0.5mm. This can effectively improve the aforementioned problems caused by the spacing C being too small.

[0058] In one embodiment, the spacing C can be selected as 0.5mm, 1mm, 1.5mm, etc.

[0059] The present application solution will be further described below with reference to specific embodiments.

[0060] Example 1 The battery pack 200 includes multiple battery cells 210 and a busbar 100. The busbar 100 includes a first sheet 110, a second sheet 120, and a buffer section 130. The first sheet 110 and the second sheet 120 are spaced apart along a first direction. The first sheet 110 and the second sheet 120 are respectively connected to two adjacent battery cells 210. The buffer section 130 is disposed between the first sheet 110 and the second sheet 120. The buffer section 130 includes at least two buffer members 131 spaced apart along a second direction. The buffer members 131 connect the first sheet 110 and the second sheet 120. The width of the buffer members 131 along the first direction is smaller than the width of the first sheet 110 along the first direction, and the width of the buffer members 131 along the first direction is smaller than the width of the second sheet 120 along the first direction.

[0061] A portion of the buffer 131 protrudes in a third direction relative to the surfaces of the first piece 110 and the second piece 120; wherein the third direction characterizes the thickness direction of the busbar 100.

[0062] The height of the buffer 131 protruding relative to the surfaces of the first piece 110 and the second piece 120 is A; the thickness of the first piece 110 and / or the second piece 120 along the third direction is T.

[0063] In this embodiment, A = 0.3 mm; T = 1.5 mm.

[0064] Example 2 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 1.2 mm; T = 1.5 mm.

[0065] Example 3 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 2 mm; T = 1.5 mm.

[0066] Example 4 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 3 mm; T = 1.5 mm.

[0067] Example 5 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 4.5 mm; T = 1.5 mm.

[0068] Comparative Example 1 This comparative example is basically the same as Example 1, except that: In this comparative example, A = 0.1 mm; T = 1.5 mm.

[0069] Comparative Example 2 This comparative example is basically the same as Example 1, except that: In this comparative example, A = 4.8 mm; T = 1.5 mm.

[0070] Test results The charging cycle performance of the battery cell 210 was tested, the structural strength of the buffer component 131 was inspected, and the stamping yield of the busbar 100 was tested. The test results are shown in Table 1.

[0071] Table 1 Example 6 The battery pack 200 includes multiple battery cells 210 and a busbar 100. The busbar 100 includes a first sheet 110, a second sheet 120, and a buffer section 130. The first sheet 110 and the second sheet 120 are spaced apart along a first direction. The first sheet 110 and the second sheet 120 are respectively connected to two adjacent battery cells 210. The buffer section 130 is disposed between the first sheet 110 and the second sheet 120. The buffer section 130 includes at least two buffer members 131 spaced apart along a second direction. The buffer members 131 connect the first sheet 110 and the second sheet 120. The width of the buffer members 131 along the first direction is smaller than the width of the first sheet 110 along the first direction, and the width of the buffer members 131 along the first direction is smaller than the width of the second sheet 120 along the first direction.

[0072] The battery cell 210 includes a housing 211, an electrode assembly 212, a cover plate 214, and a terminal assembly 215. The housing 211 has an opening. The electrode assembly 212 is disposed inside the housing 211 and has tabs 213. The cover plate 214 is disposed at one end of the electrode assembly 212 and is connected to the housing 211 to close the opening. The terminal assembly 215 is disposed on the cover plate 214. One end of the terminal assembly 215 is connected to the tab 213, and the other end of the terminal assembly 215 is connected to either the first electrode 110 or the second electrode 120.

[0073] The width of the buffer 131 along the first direction is G; the distance between the terminal assemblies 215 of two adjacent battery cells 210 along the first direction is H.

[0074] In this embodiment, G=1.2mm; H=6mm; G / H=0.2.

[0075] Example 7 This embodiment is basically the same as embodiment 6, except that: In this embodiment, G=2.4mm; H=6mm; G / H=0.4.

[0076] Example 8 This embodiment is basically the same as embodiment 6, except that: In this embodiment, G=3.6mm; H=6mm; G / H=0.6.

[0077] Example 9 This embodiment is basically the same as embodiment 6, except that: In this embodiment, G=4.8mm; H=6mm; G / H=0.8.

[0078] Comparative Example 3 This comparative example is basically the same as Example 6, except that: In this comparative example, G=1mm; H=6mm; G / H=0.17.

[0079] Comparative Example 4 This comparative example is basically the same as Example 6, except that: In this comparative example, G=5.4mm; H=6mm; G / H=0.9.

[0080] Test results The charging cycle of the battery cell 210 was tested, and the welding condition between the busbar 100 and the terminal assembly 215 was inspected. The test results are shown in Table 2.

[0081] Table 2 Example 10 The battery pack 200 includes multiple battery cells 210 and a busbar 100. The busbar 100 includes a first sheet 110, a second sheet 120, and a buffer section 130. The first sheet 110 and the second sheet 120 are spaced apart along a first direction. The first sheet 110 and the second sheet 120 are respectively connected to two adjacent battery cells 210. The buffer section 130 is disposed between the first sheet 110 and the second sheet 120. The buffer section 130 includes at least two buffer members 131 spaced apart along a second direction. The buffer members 131 connect the first sheet 110 and the second sheet 120. The width of the buffer members 131 along the first direction is smaller than the width of the first sheet 110 along the first direction, and the width of the buffer members 131 along the first direction is smaller than the width of the second sheet 120 along the first direction.

[0082] The battery cell 210 includes a housing 211, an electrode assembly 212, a cover plate 214, and a terminal assembly 215. The housing 211 has an opening. The electrode assembly 212 is disposed inside the housing 211 and has tabs 213. The cover plate 214 is disposed at one end of the electrode assembly 212 and is connected to the housing 211 to close the opening. The terminal assembly 215 is disposed on the cover plate 214. One end of the terminal assembly 215 is connected to the tab 213, and the other end of the terminal assembly 215 is connected to either the first electrode 110 or the second electrode 120.

[0083] The distance between the buffer 131 and the cover plate 214 along the third direction is C.

[0084] In this embodiment, C = 4.7 mm.

[0085] Example 11 This embodiment is basically the same as embodiment 10, except that: In this embodiment, C = 3.4 mm.

[0086] Example 12 This embodiment is basically the same as embodiment 10, except that: In this embodiment, C = 2 mm.

[0087] Example 13 This embodiment is basically the same as embodiment 10, except that: In this embodiment, C = 1.5 mm.

[0088] Example 14 This embodiment is basically the same as embodiment 10, except that: In this embodiment, C = 0.5 mm.

[0089] Comparative Example 5 This comparative example is basically the same as Example 10, except that: In this comparative example, C = 0.2 mm.

[0090] Test results The charging cycle of the battery cell 210 was tested, and the welding condition between the buffer 131 and the battery cell 210 was inspected. The test results are shown in Table 3.

[0091] Table 3 The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0092] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0093] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0094] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0095] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A busbar, characterized in that, include: The first piece; The second piece is distributed at intervals from the first piece along the first direction; A buffer section is disposed between the first piece and the second piece. The buffer section includes at least two buffer members spaced apart along a second direction. The buffer members connect the first piece and the second piece. The width of the buffer members along the first direction is smaller than the width of the first piece along the first direction, and the width of the buffer members along the first direction is smaller than the width of the second piece along the first direction. Wherein, the first direction represents the width direction of the busbar; the second direction represents the length direction of the busbar.

2. The busbar according to claim 1, characterized in that, A portion of the buffer protrudes relative to the surfaces of the first and second sheets along a third direction; wherein the third direction characterizes the thickness direction of the busbar.

3. The busbar according to claim 2, characterized in that, The portion of the buffer that protrudes from the surfaces of the first and second plates has an arc-shaped structure.

4. The busbar according to claim 2, characterized in that, The height of the buffer protrusion relative to the surfaces of the first and second pieces is A, in mm; the thickness of the first piece and / or the second piece along the third direction is T, in mm; A and T satisfy: 0.3mm≤A≤3T.

5. The busbar according to any one of claims 1 to 4, characterized in that, The first piece and / or the second piece are provided with positioning holes and mounting holes distributed along the second direction.

6. The busbar according to any one of claims 1 to 4, characterized in that, The length of the buffer along the second direction is B, in mm; B satisfies: 1mm≤B≤5mm.

7. A battery pack, characterized in that, include: Multiple battery cells; The busbar as described in any one of claims 1 to 6, wherein the first plate and the second plate are respectively connected to two adjacent battery cells.

8. The battery pack according to claim 7, characterized in that, The battery cell includes: The casing has an opening; An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode tabs; A cover plate is provided at one end of the electrode assembly, and the cover plate is connected to the housing to close the opening; An electrode assembly is disposed on the cover plate, one end of the electrode assembly is connected to the electrode tab, and the other end of the electrode assembly is connected to the first piece or the second piece.

9. The battery pack according to claim 8, characterized in that, The width of the buffer component along the first direction is G, in mm; the distance between the terminal assemblies of two adjacent battery cells along the first direction is H, in mm; G and H satisfy: 0.2≤G / H≤0.

8.

10. The battery pack according to claim 8, characterized in that, The distance between the buffer and the cover plate along the third direction is C, in mm; C satisfies: C≥0.5mm; wherein, the third direction represents the thickness direction of the busbar.

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