Convergence plate and battery
By setting up multiple arc-shaped pressure relief tanks on the first bus zone of the lithium-ion battery bus disk, the existing bus disk has been solved, and the pressure relief and liquid injection efficiency is achieved more efficiently.
Patent Information
- Application Number
- CN202323459800.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2033-12-18
AI Technical Summary
The pressure relief efficiency and liquid injection efficiency of existing lithium-ion battery bus disks are low.
A bus disk is designed, and its main body includes a first bus area and a second bus area. The second bus area is arranged around the first bus area, and a plurality of pressure relief grooves are arranged circumferentially at the first bus area. The pressure relief grooves are It includes an arc-shaped groove body connecting the first groove tube and the second groove tube.
By increasing the number and area of the pressure relief tank, the pressure relief efficiency and liquid injection efficiency are improved, ensuring that the electrolyte can be injected into the battery cell evenly.
Smart Images
Figure CN222530752U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of busbars, and in particular to a busbar and a battery. Background Art
[0002] Compared with traditional batteries such as nickel-cadmium and lead-acid batteries, lithium-ion batteries have the advantages of high energy density, high operating voltage, low self-discharge rate, long cycle life, high charge and discharge efficiency, wide operating temperature range, and low environmental pollution. At present, lithium-ion batteries have been widely used in 3C devices such as mobile phones and notebooks and new energy vehicles, and also have broad application prospects in aerospace fields such as civil aircraft, drones, and space probes.
[0003] At present, the busbar of a lithium battery is usually welded to the tab, but the existing busbar only has a central pressure relief hole, which has problems of low pressure relief efficiency and low liquid injection efficiency. Utility Model Content
[0004] In view of this, the present application provides a busbar and a battery, wherein the busbar can improve pressure relief efficiency and liquid injection efficiency.
[0005] To solve the above problems, the technical solutions provided by this application are as follows:
[0006] In a first aspect, the present application provides a busbar, comprising:
[0007] The main body of the convergence plate includes a first convergence area and a second convergence area, and the second convergence area is arranged around at least a portion of the first convergence area; the main body of the convergence plate also includes a plurality of pressure relief grooves located in the first convergence area and circumferentially spaced, wherein the pressure relief grooves include a first groove tube, a second groove tube and a groove body, and the two ends of the groove body are respectively connected to the first groove tube and the second groove tube, and the groove body is arc-shaped, and the center of the arc where the groove body is located is located on the side of the groove body close to the second convergence area.
[0008] In an optional embodiment of the present application, one end of the first slot tube and the second slot tube away from the slot body extends to a side of the second confluence area close to the first confluence area.
[0009] In an optional embodiment of the present application, first connection areas are circumferentially spaced apart on the first bus area for connecting to the tabs of the battery cell, and the first connection areas are located between the first slot tube and the second slot tube.
[0010] In an optional embodiment of the present application, the first connection area has a first gap on two opposite sides close to the pressure relief groove.
[0011] In an optional embodiment of the present application, a second connection area is circumferentially arranged on the first bus area for connecting to the pole ear of the battery cell, and the second connection area is located between two adjacent pressure relief grooves, wherein the area of the first connection area is smaller than the area of the second connection area.
[0012] In an optional embodiment of the present application, the second connection area has a second interval on two opposite sides close to two adjacent pressure relief grooves.
[0013] In an optional embodiment of the present application, the first groove tube and the second groove tube both have relatively parallel first side walls and second side walls, the spacing between the first side walls and the second side walls is 0.6 mm-1.1 mm, and the lengths of the first side walls and the second side walls are 2.6 mm-3.9 mm.
[0014] In an optional embodiment of the present application, the groove body includes a first curved side wall and a second curved side wall that are opposite to each other, the diameter of the first curved side wall is 3.3mm-4.8mm, and the diameter of the second curved side wall is 1.5mm-2.5mm, wherein the two ends of the first curved side wall are respectively connected to the first side walls of the first groove tube and the second groove tube, and the two ends of the second curved side wall are respectively connected to the second side walls of the first groove tube and the second groove tube.
[0015] In an optional embodiment of the present application, the first confluence area is provided with a central pressure relief hole along the first direction, and the central pressure relief hole is provided at the center of the second confluence area and is located on a side of the pressure relief groove away from the second confluence area.
[0016] In an optional embodiment of the present application, the vertical distance between the center of the central pressure relief hole and the second connection area is a first length, and the vertical distance between the center of the central pressure relief hole and the groove body is a second length, and the first length is smaller than the second length.
[0017] In an optional embodiment of the present application, a portion of the first bus area that does not enclose the second bus area is provided with a conductive portion, and the conductive portion is connected to the first bus area.
[0018] In an optional embodiment of the present application, a side of the conductive portion away from the busbar body is in an arc shape.
[0019] In a second aspect, the present application provides a battery, comprising:
[0020] Current interrupting devices;
[0021] Battery cells;
[0022] As the above busbar, the busbar is connected to the current interruption device and the battery cell respectively.
[0023] The busbar provided in the present application includes at least the following beneficial effects: the busbar includes a busbar body and a conductive portion, wherein the busbar body includes a first busbar area and a second busbar area, and the second busbar area is arranged around at least a portion of the first busbar area. The busbar body also includes a plurality of pressure relief grooves located in the first busbar area and circumferentially spaced, wherein the pressure relief grooves include a first groove tube, a second groove tube and a groove body, and the two ends of the groove body are respectively connected to the first groove tube and the second groove tube, and the groove body is arc-shaped. The pressure relief groove has the function of relieving pressure and also has the function of injecting electrolyte. The number of pressure relief grooves is multiple, which increases the area of pressure relief and liquid injection, and improves the pressure relief efficiency and liquid injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0025] Figure 1 A schematic structural diagram of a busbar provided in a preferred embodiment of the present application.
[0026] Figure 2 Another structural schematic diagram of a busbar provided in a preferred embodiment of the present application.
[0027] Figure 3 Another structural schematic diagram of a busbar provided in a preferred embodiment of the present application.
[0028] Figure 4A , 4B 4C is a schematic diagram of a pressure relief groove provided in an embodiment of the present application.
[0029] Figure 5 A schematic diagram of a welding track provided in accordance with an embodiment of the present application.
[0030] Figure 6 A cross-sectional view of a busbar provided in accordance with an embodiment of the present application.
[0031] Figure markings: 100-bus plate body; 10-first bus area; 101-pressure relief groove; 1011-first groove tube; 1011a-first side wall; 1011b-second side wall; 1012-second groove tube; 1012a-first side wall; 1012b-second side wall; 1013-groove body; 1013a-first curved side wall; 1013b-second curved side wall; 1014-first interval; 1015-second interval; 102-first connection area; 103-second connection area; 104-central pressure relief hole; 20-second bus area; 200-conductive part; 300-welding track. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0034] The present application may repeat reference numerals and / or reference letters in different implementations. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.
[0035] The busbar and the battery provided by the present application will be described in detail below in combination with specific embodiments and drawings. The busbar can be used as a positive busbar of a battery, for example.
[0036] See also Figure 1-4A The present application provides a busbar, comprising:
[0037] The main body 100 of the convergence plate includes a first convergence area 10 and a second convergence area 20, wherein the second convergence area 20 is arranged around at least a portion of the first convergence area 10; the main body 100 of the convergence plate also includes a plurality of pressure relief grooves 101 located on the first convergence area 10 and circumferentially spaced, wherein the pressure relief grooves 101 include a first groove tube 1011, a second groove tube 1012 and a groove body 1013, wherein both ends of the groove body 1013 are respectively connected to the first groove tube 1011 and the second groove tube 1012, and the groove body 1013 is arc-shaped, and the center of the arc of the groove body 1013 is located on the side of the groove body 1013 close to the second convergence area 20.
[0038] Specifically, the tank body 1013 is bent toward the side close to the second confluence area 20, and the two ends of the tank body 1013 are respectively connected to the first tank tube 1011 and the second tank tube 1012, and the first tank tube 1011 and the second tank tube 1012 extend toward the side close to the second confluence area 20. The positive projection of the pressure relief tank 101 is projected onto the battery cell, and the electrolyte can be injected into the battery cell from the first tank tube 1011, the second tank tube 1012 and the tank body 1013, ensuring that the electrolyte can be injected into various places of the battery cell. In addition, the tank body 1013 is in a smooth arc shape, and the injected electrolyte can, for example, flow into the first tank tube 1011 and the second tank tube 1012 along the arc of the tank body 1013 and be injected into the battery cell, which improves the uniformity of the injection, so that the electrolyte can infiltrate various positions of the battery cell, and improves the injection efficiency of the electrolyte.
[0039] Furthermore, when the electrolyte is injected, the electrolyte spreads around the busbar, and the plurality of pressure relief grooves 101 are arranged circumferentially at intervals on the first busbar area 10. The electrolyte can flow into the first tank tube 1011 and the second tank tube 1012 along the arc-shaped tank body 1013, further improving the injection efficiency and uniformity of the electrolyte. Figure 1 For example, the first bus region 10 has a connection surface A along a second direction X perpendicular to the first direction Y, and the orthographic projection of the connection surface A in the second direction X is, for example, a rectangle, and the conductive portion 200 is perpendicularly connected to the connection surface A along the second direction X. Specifically, the second bus region 20 is disposed around the first bus region 10 except the connection surface A.
[0040] See also Figure 1-Figure 3Specifically, the number of the pressure relief grooves 101 is, for example, 3 in this embodiment, but is not limited thereto, and is adaptively increased according to the area of the busbar body 100 to improve the electrolyte injection efficiency or pressure relief efficiency. A central pressure relief hole 104 is provided on the first busbar area 10, and the straight-line distance from the center of the central pressure relief hole 104 to the connection surface A is smaller than the distance from the center of the central pressure relief hole 104 to the outer edge of the first busbar area 10. Based on the comparison of the distances, the first busbar area 10 is not provided with a pressure relief groove 101 on the side close to the connection surface A.
[0041] See also Figure 4A-Figure 6 In an optional embodiment of the present application, one end of the first groove tube 1011 and the second groove tube 1012 away from the groove body 1013 extends to a side of the second confluence area 20 close to the first confluence area 10 .
[0042] It can be understood that the ends of the first groove tube 1011 and the second groove tube 1012 away from the central pressure relief hole 104 are in contact with the side of the second confluence area 20 close to the first confluence area 10. The pressure relief groove 101 is located in the first confluence area 10 and does not extend to the side of the second confluence area 20 away from the first confluence area 10, which ensures the strength of the confluence plate structure and makes the confluence plate not easily deformed.
[0043] Exemplarily, the ends of the first slot tube 1011 and the second slot tube 1012 away from the slot body 1013 may not extend to the side of the second confluence area 20 close to the first confluence area 10, that is, the ends of the first slot tube 1011 and the second slot tube 1012 away from the central pressure relief hole 104 are at a certain distance from the second confluence area 20, and the distance is based on the principle of not affecting the area of the first connection area 102, the second connection area 103 and the central pressure relief hole 104, and is subject to actual application. In an optional embodiment of the present application, the first confluence area 10 is provided with a first connection area 102 at intervals circumferentially, which is used to connect to the pole ear of the battery cell, and the first connection area 102 is located between the first slot tube 1011 and the second slot tube 1012.
[0044] See also Figure 2-Figure 5 Specifically, the first connection area 102 is a welding area, and a welding track 300 is formed in the first connection area 102. The first connection area 102 is welded to the tab of the battery cell. The welding area can be laser welded, for example, but is not limited thereto.
[0045] In an optional embodiment of the present application, the first connection area 102 has first gaps 1014 on two opposite sides close to the pressure relief groove 101 .
[0046] Specifically, the first connection area 102 is located between the first slot tube 1011 and the second slot tube 1012 and on the side where the slot body 1013 is bent toward the second confluence area 20 .
[0047] It can be understood that the first connection area 102 is not connected to the side of the slot body 1013 close to the second conduit area 20 , and there is a first gap 1014 between the two.
[0048] More specifically, there is a first interval 1014 between the end of the first connection area 102 away from the second confluence area 20 and the first slot tube 1011, the second slot tube 1012 or the slot body 1013, and the first interval 1014 is used to prevent the first connection area 102 from connecting with the pressure relief groove 101, thereby affecting the continuity and integrity of the welding track 300. The end of the first connection area 102 away from the second confluence area 20 includes a first end and a second end, the first end and the first slot tube 1011 or the slot body 1013 have a first interval 1014, and the second end and the second slot tube 1012 or the slot body 1013 also have a first interval 1014, and the distance of the first interval 1014 is based on actual application, and the first connection area 102 does not contact the pressure relief groove 101. In addition, the welding track 300 formed in the first connection area 102 is a continuous welding track 300, and the continuity of the welding track 300 is not affected by the formation of the pressure relief groove 101.
[0049] In an optional embodiment of the present application, second connection areas 103 are circumferentially spaced apart on the first bus area 10 , and the second connection areas 103 are used to connect to the pole ears of the battery cell. The second connection areas 103 are located between two adjacent pressure relief grooves 101 , and the area of the first connection area 102 is smaller than that of the second connection area 103 .
[0050] Specifically, the arrangement of the first connection area 102 and the second connection area 103 increases the welding area and ensures the stability of welding. Since the area of the first connection area 102 is smaller than the area of the second connection area 103, the length of the welding track 300 formed in the first connection area 102 is, for example, smaller than the length of the welding track 300 formed in the second connection area 103.
[0051] Exemplarily, the end of the first connection area 102 close to the second bus area 20 has a first distance from the second bus area, and the end of the second connection area 103 close to the second bus area 20 also has a second distance from the second bus area, and the first distance is equal to the second distance. Since the length of the welding track 300 formed by the first connection area 102 is less than the length of the welding track 300 formed by the second connection area 103, the end of the second connection area 103 away from the second bus area 20 is closer to the center of the first bus area 10, and the welding track 300 formed in the second connection area 103 is also a continuous and uninterrupted welding track 300.
[0052] Specifically, with the center of the central pressure relief hole 104 as a reference, the diameter of the center of the central pressure relief hole 104 from the end of the second connection area 103 away from the second confluence area 20 is, for example, 8mm-8.6mm, but not limited thereto, and the diameter of the center of the central pressure relief hole 104 from the end of the first connection area 102 away from the second confluence area 20 is greater than 8mm-8.6mm, which is subject to actual application. The first connection area 102 and the second connection area 103 are arranged at intervals, so that the first connection area 102 and the second connection area 103 have sufficient welding area for welding with the tabs of the battery cell, and the welding is more stable.
[0053] In an optional embodiment of the present application, the second connection area 103 has a second gap 1015 on two opposite sides close to two adjacent pressure relief grooves 101 .
[0054] Specifically, the second connection area 103 is a welding area located between two adjacent pressure relief grooves 101, and a second interval 1015 is provided between the end of the second connection area 103 away from the second confluence area 20 and the two adjacent pressure relief grooves 101. The length of the second interval 1015 is subject to actual application, and the second connection area 103 is subject to no contact with the pressure relief groove 101. Moreover, the welding track 300 formed in the second connection area 103 is a continuous welding track 300, and the continuity of the welding track 300 is not affected by the formation of the pressure relief groove 101. In an optional embodiment of the present application, the first groove tube 1011 and the second groove tube 1012 both have a relatively parallel first side wall and a second side wall, the spacing between the first side wall and the second side wall is 0.6mm-1.1mm, and the length of the first side wall and the second side wall is 2.6mm-3.9mm.
[0055] Specifically, the first groove tube 1011 includes a relatively parallel first side wall 1011a and a second side wall 1011b, and the first side wall 1011a and the second side wall 1011b have the same length; the second groove tube 1012 includes a relatively parallel first side wall 1012a and a second side wall 1012b, and the first side wall 1012a and the second side wall 1012b have the same length.
[0056] In an optional embodiment of the present application, the groove body 1013 includes a first curved side wall 1013a and a second curved side wall 1013b that are arranged opposite to each other, the diameter of the first curved side wall 1013a is 3.3mm-4.8mm, and the diameter of the second curved side wall 1013b is 1.5mm-2.5mm, wherein the two ends of the first curved side wall 1013a are respectively connected to the first side wall 1011a of the first groove tube 1011 and the first side wall 1012a of the second groove tube 1012, and the two ends of the second curved side wall 1013b are respectively connected to the second side wall 1011b of the first groove tube 1011 and the second side wall 1012b of the second groove tube 1012, and the arc lengths of the first curved side wall 1013a and the second curved side wall 1013b are adaptively changed according to actual conditions.
[0057] Specifically, in order to meet the spatial requirements of the welding track 300, it is necessary to limit the positional relationship between the first connection area 102 and the second connection area 103 and the pressure relief groove 101. In one embodiment, the spacing between the first side wall 1011a and the second side wall 1011b is 0.6mm-1.1mm, and the spacing between the first side wall 1012a and the second side wall 1012b is 0.6mm-1.1mm, that is, the width of the first groove tube 1011 and the second groove tube 1012 is 0.6mm-1.1mm. For ease of description, the first side wall 1011a and the first side wall 1012a are collectively referred to as the first side wall, and the second side wall 1011b and the second side wall 1012b are collectively referred to as the second side wall. The length of the first side wall and the second side wall is 2.6 mm, the diameter of the first curved side wall 1013a is 3.8 mm-4.8 mm, the diameter of the second curved side wall 1013b is 2.5 mm, the first spacing is 0.5 mm, and the second spacing is greater than or equal to 0.5 mm. The first spacing and the second spacing are used to ensure that the first connection area 102 and the second connection area 103 do not contact the pressure relief groove 101, thereby affecting the welding trajectory 300.
[0058] It can be understood that in this embodiment, when the length of the first side wall and the second side wall is a fixed value of 2.6 mm, the spacing between the first side wall and the second side wall is not greater than 1.1 mm. If it is greater than 1.1 mm, the pressure relief groove 101 will come into contact with the first connection area 102 and the second connection area 103, thereby affecting the welding trajectory 300.
[0059] In another embodiment, when the spacing between the first side wall and the second side wall is 0.6 mm, the sum of the areas of the plurality of pressure relief grooves 101 and the central pressure relief hole 104 is 26.6 mm. 2When the spacing between the first side wall and the second side wall is 1.1 mm, the sum of the areas of the plurality of pressure relief grooves 101 and the central pressure relief hole 104 is 41.4 mm 2 That is, when the spacing between the first side wall and the second side wall is 0.6 mm to 1.1 mm, the sum of the total pressure relief areas of the plurality of pressure relief grooves 101 and the central pressure relief hole 104 is not less than 26.6 mm. 2 conditions.
[0060] See also Figure 4C In another embodiment, the shape of the pressure relief groove 101 may also be changed, but the inclination angle of the changed pressure relief groove 101 is different from Figure 4A and Figure 4B The inclination angles of the first groove tube 1011 and the second groove tube 1012 are consistent to ensure that the pressure relief groove 101 does not contact the first connection area 102 and the second connection area 103, affecting the welding track 300. In this embodiment, the length of the first side wall and the second side wall can be 3.9 mm, the spacing between the first side wall and the second side wall can be 0.88 mm, the diameter of the first curved side wall 1013a can be 3.3 mm, and the diameter of the second curved side wall 1013b can be 1.5 mm, so that the sum of the total pressure relief areas of the multiple pressure relief grooves 101 and the central pressure relief hole 104 is not less than 26.6 mm 2 .
[0061] In an optional embodiment of the present application, the first confluence area 10 is provided with a central pressure relief hole 104 along the first direction Y, and the central pressure relief hole 104 also has the functions of pressure relief and electrolyte injection.
[0062] In an optional embodiment of the present application, the vertical distance between the center of the central pressure relief hole 104 and the second connection area 103 is a first length, and the vertical distance between the center of the central pressure relief hole 104 and the groove body 1013 is a second length, and the first length is smaller than the second length.
[0063] Specifically, the electrolyte falls into the busbar, part of the electrolyte is injected into the battery cell along the central pressure relief hole 104, and the other part, for example, flows along the busbar into the circumferentially arranged pressure relief groove 101, the pressure relief groove 101 includes an arc-shaped groove body 1013, and the electrolyte, for example, flows along the groove body 1013 into the first groove tube 1011 and the second groove tube 1012 and into the battery cell, so that the battery cell is evenly injected, thereby improving the electrolyte injection efficiency or the pressure relief efficiency.
[0064] Exemplarily, when the first bus area 10 is a complete circle, the center position of the first bus area 10 is determined, and the central pressure relief hole 104 is, for example, located at the center of the first bus area 10. When the position of the central pressure relief hole 104 is confirmed, a connection surface A is further set, and a conductive portion 200 is set on the connection surface A. The diameter distance of the center of the central pressure relief hole 104 from the end of the second connection area 103 away from the second bus area 20 is, for example, 8mm-8.6mm, but is not limited thereto. The diameter distance of the center of the central pressure relief hole 104 from the end of the first connection area 102 away from the second bus area 20 is greater than 8mm-8.6mm, which is subject to actual application.
[0065] In an optional embodiment of the present application, a portion of the first bus region 10 that does not enclose the second bus region 20 is provided with a conductive portion 200 , and the conductive portion 200 is connected to the first bus region 10 .
[0066] Specifically, the first bus region 10 has a connection surface A along a second direction X perpendicular to the first direction Y, the conductive portion 200 is perpendicularly connected to the connection surface A along the second direction X, and the connection surface A is not surrounded by the second bus region 20 .
[0067] In an optional embodiment of the present application, the side of the conductive portion 200 away from the busbar body 100 is in an arc shape, but not limited thereto, and is used to avoid blocking the air leakage holes of the cap plate.
[0068] In a second aspect, in another optional embodiment of the present application, a battery is provided, comprising:
[0069] Current interrupting devices;
[0070] Battery cells;
[0071] As the above busbar, the busbar is connected to the current interruption device and the battery cell respectively.
[0072] Specifically, the busbar is used as a positive busbar, for example. The battery cell includes necessary components such as a positive electrode tab, a negative electrode tab, a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, and the busbar has a first connection area 102 and a second connection area 103, and one side is laser welded with the positive electrode tab, and the welding position is, for example, the first connection area 102 and the second connection area 103. The conductive part 200 of the busbar is connected to the current interruption device at one end away from the busbar body 100.
[0073] Specifically, the current interrupter has an exhaust hole. For example, the area of the plurality of pressure relief grooves 101 plus the central pressure relief hole is, for example, 32.13 mm 2 , the area of the exhaust hole is, for example, 26.61 mm 2 . That is 32.13mm2 >26.61mm 2 The area of the multiple pressure relief grooves 101 plus the central pressure relief hole is larger than the area of the exhaust hole, thereby improving the pressure relief efficiency and the liquid injection efficiency.
[0074] The busbar provided in the present application includes at least the following working processes or principles: the busbar includes a busbar body and a conductive portion, wherein the busbar body includes a first busbar area and a second busbar area, and the second busbar area is arranged around at least a portion of the first busbar area. The busbar body also includes a plurality of pressure relief grooves located in the first busbar area and circumferentially spaced, wherein the pressure relief grooves include a first groove tube, a second groove tube and a groove body, and the two ends of the groove body are respectively connected to the first groove tube and the second groove tube, and the groove body is arc-shaped. The pressure relief groove has the function of relieving pressure and also has the function of injecting electrolyte, and the number of the pressure relief grooves is multiple, which increases the area of pressure relief and liquid injection, and improves the pressure relief efficiency and liquid injection efficiency.
[0075] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.
Claims
1. A busbar, characterized in that: include: The main body of the convergence plate includes a first convergence area and a second convergence area, and the second convergence area is arranged around at least a portion of the first convergence area; the main body of the convergence plate also includes a plurality of pressure relief grooves located in the first convergence area and circumferentially spaced, wherein the pressure relief grooves include a first groove tube, a second groove tube and a groove body, and the two ends of the groove body are respectively connected to the first groove tube and the second groove tube, and the groove body is arc-shaped, and the center of the arc where the groove body is located is located on the side of the groove body close to the second convergence area.
2. The busbar according to claim 1, wherein: One end of the first slot tube and the second slot tube away from the slot body extends to a side of the second confluence area close to the first confluence area.
3. The busbar according to claim 2, wherein: The first busbar area is provided with a first connection area at intervals in the circumferential direction for connecting with the tab of the battery cell, and the first connection area is located between the first slot tube and the second slot tube.
4. The busbar according to claim 3, wherein: The first connection area has a first gap at two opposite sides close to the pressure relief groove.
5. The busbar according to claim 3, wherein: A second connection area is circumferentially arranged on the first bus area for connection with the tab of the battery cell, and the second connection area is located between two adjacent pressure relief grooves, wherein the area of the first connection area is smaller than that of the second connection area.
6. The busbar according to claim 5, wherein: The second connection area has a second interval on two opposite sides close to two adjacent pressure relief grooves.
7. The busbar according to any one of claims 1 to 6, characterized in that: The first slot tube and the second slot tube both have a first side wall and a second side wall that are relatively parallel, the spacing between the first side wall and the second side wall is 0.6 mm-1.1 mm, and the length of the first side wall and the second side wall is 2.6 mm-3.9 mm.
8. The busbar according to claim 7, wherein: The groove body includes a first curved side wall and a second curved side wall arranged opposite to each other, the diameter of the first curved side wall is 3.3mm-4.8mm, and the diameter of the second curved side wall is 1.5mm-2.5mm, wherein the two ends of the first curved side wall are respectively connected to the first side walls of the first groove tube and the second groove tube, and the two ends of the second curved side wall are respectively connected to the second side walls of the first groove tube and the second groove tube.
9. The busbar according to claim 5, wherein: The first confluence area is provided with a central pressure relief hole along a first direction, and the central pressure relief hole is provided at the center of the second confluence area and is located on a side of the pressure relief groove away from the second confluence area.
10. The busbar according to claim 9, wherein: The vertical distance between the center of the central pressure relief hole and the second connection area is a first length, and the vertical distance between the center of the central pressure relief hole and the slot body is a second length, and the first length is smaller than the second length.
11. The busbar according to claim 1, wherein: A portion of the first bus region that does not surround the second bus region is provided with a conductive portion, and the conductive portion is connected to the first bus region.
12. The busbar according to claim 11, wherein: The side of the conductive portion away from the busbar body is in an arc shape.
13. A battery, characterized in that: include: Current interrupting devices; Battery cells; The busbar according to any one of claims 1 to 12, wherein the busbar is connected to the current interruption device and the battery cell respectively.