Battery pin and battery
By setting a deformation release structure at the welding site of the battery pin, the problem of extension or deformation after welding of the positive electrode pin of the battery cell is solved, and more efficient pressure distribution control and battery energy density improvement are achieved.
Patent Information
- Application Number
- CN202421022812.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Inside the battery cell, the positive electrode pins often extend or deform after welding, resulting in structural problems, which are difficult for the prior art to effectively solve this problem.
A battery pin is designed, and its second connecting portion is provided with a deformation release structure at the welding site, including a plurality of deformation release grooves arranged at intervals, which can accommodate deformation of aluminum in a high pressure state and prevent expansion or deformation.
By optimizing the battery pin structure, the problems of extension or deformation of the positive electrode pin after welding are successfully avoided, the pressure distribution during welding is accurately controlled, the extension and deformation of aluminum material is reduced, the secondary problems in the structure are avoided, and the energy density of the battery is improved.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and more specifically to a battery pin and a battery. Background Art
[0002] Inside the battery cell, the core package tabs and battery pins are connected by ultrasonic welding. During ultrasonic welding, the pressure between the welding head and the welding seat is relatively high, and the aluminum material itself is soft and has low hardness, which often causes the positive electrode pins to extend or deform after welding, causing secondary structural problems, such as being unable to fold flat, and oversize after extension. To circumvent this problem, design redundancy is often added to the internal space of the battery cell to accommodate the secondary problems caused by the extension and deformation of the positive electrode pins. However, the above approach is likely to cause new problems: insufficient battery cell capacity, overweight, and other problems. Utility Model Content
[0003] The purpose of the embodiments of the utility model is to provide a battery pin and a battery, which can fully utilize the limited space inside the battery cell, improve the utilization rate of the internal space, and further improve the energy density of the battery.
[0004] In the first aspect, an embodiment of the utility model provides a battery pin for connecting a pole and a pole lug of a battery cell, comprising: a connecting part and a second connecting part, the first connecting part being electrically connected to the pole; the second connecting part comprising a connecting portion connected to the first connecting portion and a welding portion located on at least one side of the connecting portion, the second connecting portion being connected to the pole lug via the welding portion, and the welding portion being provided with a deformation release structure.
[0005] In one embodiment, the deformation relief structure includes a plurality of deformation relief grooves arranged at intervals.
[0006] In one embodiment, a plurality of deformation relief grooves are arranged at intervals in the width direction and / or height direction of the welding portion.
[0007] In one embodiment, the deformation release structures are arranged in a plurality of groups along the length direction of the welding part, and each group of the deformation release structures includes a plurality of deformation release grooves arranged side by side and at intervals.
[0008] In one embodiment, the deformation relief structure includes a plurality of deformation relief grooves arranged at intervals in a height direction of the welding portion.
[0009] In one embodiment, the deformation relief structure includes a plurality of deformation relief grooves arranged side by side and spaced apart from each other.
[0010] In one embodiment, the distance between two adjacent deformation relief grooves is 0.5 mm to 3 mm.
[0011] In one embodiment, the ratio of the total length of the deformation relief grooves arranged along the height direction on the welding part to the height of the welding part is 0.5 to 0.95.
[0012] In one embodiment, a ratio of the residual thickness of the welding portion at the deformation relief groove to the total thickness is 0.2 to 0.9.
[0013] In one embodiment, the cross-section of the deformation relief groove is configured to be an arc, rectangle, triangle, trapezoid or irregular shape.
[0014] In one embodiment, the deformation relief structure is provided on the side of the welding portion facing away from the pole ear.
[0015] In one embodiment, the width of the deformation relief groove is 0.1 mm to 2 mm.
[0016] In the second aspect, an embodiment of the utility model provides a battery, comprising a battery pin, a top cover and a battery cell as described in any of the above, wherein the battery cell has a pole lug and a pole, the top cover is connected to the pole of the battery cell, the first connecting portion of the battery pin is electrically connected to the pole, and the second connecting portion of the battery pin is electrically connected to the pole lug of the battery cell.
[0017] The beneficial effects of the battery pins and batteries provided by the embodiments of the utility model are as follows: compared with the related art, the utility model successfully avoids the elongation or deformation problem that is easy to occur after the positive electrode pin is welded by optimizing the structural design of the battery pin; it can accurately control the pressure distribution during the welding process, effectively reduce the elongation and deformation of the aluminum material, thereby avoiding secondary structural problems; at the same time, by improving the internal layout of the battery cell, the design redundancy is reduced, so that the internal space of the battery cell can be more fully utilized.
[0018] The utility model not only improves the utilization rate of the internal space of the battery cell, but also further improves the energy density of the battery, optimizes the overall structure of the battery, and provides a new solution for the development and application of battery technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0020] Figure 1 A schematic diagram of a three-dimensional structure of a first battery pin in a bent state provided by an embodiment of the utility model;
[0021] Figure 2A schematic diagram of a three-dimensional structure of a first battery pin in a flattened state provided by an embodiment of the utility model;
[0022] Figure 3 A schematic diagram of a three-dimensional structure of a second battery pin in a bent state provided by an embodiment of the utility model;
[0023] Figure 4 A schematic diagram of a three-dimensional structure of a second battery pin in a flattened state provided by an embodiment of the utility model;
[0024] Figure 5 A schematic diagram of the three-dimensional structure of a battery provided in an embodiment of the utility model;
[0025] Figure 6 for Figure 5 A magnified view of the local A;
[0026] Figure 7 A schematic plan view of a first type of battery pin provided by an embodiment of the utility model;
[0027] Figure 8 A schematic plan view of a second type of battery pin provided by an embodiment of the utility model;
[0028] Fig. 9 A schematic cross-sectional view of a first type of battery pin and a second type of battery pin provided by an embodiment of the utility model;
[0029] Fig.10 This is a schematic diagram of the three-dimensional structure of the first battery pin in a bent and stacked state provided by the utility model.
[0030] Among them, the reference numerals in the figure are:
[0031] 1. Battery; 10. Battery pin; 101. First connection part; 102. Second connection part; 1021. Connection part; 1022. Welding part; 1023. Deformation release groove; 20. Top cover; 201. Post; 30. Battery cell; 301. Tab. DETAILED DESCRIPTION
[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0034] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention.
[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0036] In batteries, battery pins are usually used to connect the battery cell poles and tabs. Inside the battery cell, the tabs of the battery cell are connected to the battery pins by ultrasonic welding. When ultrasonic welding is used, the pressure between the welding head and the welding seat is relatively large, and aluminum itself is soft and has low hardness, which often causes the positive battery pins to stretch or deform after welding, causing secondary structural problems. Therefore, it is necessary to provide a battery pin to solve the above technical problems. The utility model provides the following technical solutions to solve the above technical problems.
[0037] See also Figure 1 , a battery pin provided by an embodiment of the utility model is now described. The battery pin includes: a first connection part 101 and a second connection part 102, and the first connection part 101 is electrically connected to the pole 201 of the top cover 20. The first connection part 101 and the second connection part 102 are integrally formed, and the first connection part 101 and the second connection part 102 are arranged at an angle of 90°, and the first connection part 101 and the second connection part 102 can be realized by a single bending process. The second connection part 102 includes a connection part 1021 located in the middle of the second connection part 102 and a welding part 1022 located on at least one side of the connection part 1021. In this embodiment, welding parts 1022 are set on both sides of the connection part 1021, and the connection part 1021 and the two welding parts 1022 can be bent relative to each other. In order to facilitate the welding between the welding part 1022 and the pole ear 301, when the welding part 1022 is welded to the pole ear 301, the welding part 1022 and the connection part 1021 are set at a first preset angle. Preferably, the first preset angle is 90°.
[0038] When the second connection portion 102 is connected to the tab 301 of the battery cell 30 through the welding portion 1022, a deformation release structure is provided at the welding portion 1022. In a specific embodiment, the deformation release structure is provided at the side of the welding portion 1022 away from the tab 301.
[0039] The deformation release structure includes a plurality of deformation release grooves 1023 arranged at intervals. In a specific embodiment, the plurality of deformation release grooves 1023 are arranged at intervals in the width direction and the height direction of the welding part. The utility model designs the deformation release groove 1023 on the back side of the welding surface of the welding part 1022 and the tab 301. The design of the structure can accommodate the deformation of the aluminum material under high pressure, thereby preventing the aluminum material from extending to the surroundings or deforming in other forms under high pressure.
[0040] like Figure 7 As shown, in this embodiment, the second connecting portion 102 is made of a metal flat plate with uniform thickness, wherein the welding portion 1022 and the connecting portion 1021 have the same thickness, and n groups of deformation release structures are arranged on the welding portion 1022, wherein n≤8. In a specific implementation, n can be 1, 2, 3, 4, 5, 6, 7, or 8.
[0041] The spacing d between two adjacent deformation release grooves 1023 is 0.5mm to 3mm. In a specific implementation, the spacing d can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. If the spacing between two adjacent deformation release grooves 1023 is too large, the deformation release area will be reduced, and the deformation absorption effect will be poor.
[0042] In order to limit the deformation area after welding, the ratio of the total length n*b of the deformation release groove arranged along the height direction on the welding part 1022 to the height c of the welding part 1022 is 0.5 to 0.95. In a specific implementation, it can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, or 0.95.
[0043] Considering the structural strength of the welding part 1022, the ratio of the residual thickness e of the welding part 1022 at the deformation release groove 1023 to the total thickness f is 0.2 to 0.9. In a specific implementation, it can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.
[0044] Under the condition of meeting the size requirement of welding deformation, the width a of the deformation release groove 1023 is 0.1 mm to 2 mm. In a specific implementation, the width a can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, or 2 mm.
[0045] In this embodiment, after the welding of the welding portion 1022 and the tab 301 is completed, the welding portion 1022 and the tab 301 are flattened or bent and stacked together, respectively. Figure 2 or Fig.10 As shown, at this time, the welding part 1022 and the connecting part 1021 are arranged at a second preset angle. Preferably, the second preset angle is 180°.
[0046] Compared with the related art, the battery pin provided by the utility model successfully avoids the problem of elongation or deformation that is easy to occur after the positive electrode pin is welded. The pressure distribution during the welding process can be accurately controlled, and the elongation and deformation of the aluminum material can be effectively reduced, thereby avoiding secondary structural problems. At the same time, by improving the internal layout of the battery cell, the design redundancy is reduced, so that the internal space of the battery cell can be more fully utilized.
[0047] In one embodiment of the present invention, please refer to Figure 3 , Figure 4 , Figure 8 and Fig. 9 , is a three-dimensional schematic diagram of a second type of battery pin provided by an embodiment of the utility model. The difference from the first type of battery pin is that in this embodiment, a plurality of deformation release grooves 1023 are arranged at intervals in the height direction of the welding part 1022, and n1 deformation release grooves 1023 are provided.
[0048] The spacing d between two adjacent deformation release grooves 1023 is 0.5mm to 3mm. In a specific implementation, the spacing d can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. If the spacing between two adjacent deformation release grooves 1023 is too large, the deformation release area will be reduced, and the deformation absorption effect will be poor.
[0049] In order to limit the deformation area after welding, the ratio of the total length n1*b1 of the deformation relief groove 1023 provided on the welding part 1022 to the height c of the welding part 1022 is 0.5 to 0.95, and in a specific implementation, it can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95. Considering the structural strength of the welding part 1022, the ratio of the residual thickness e of the welding part 1022 at the deformation relief groove 1023 to the total thickness f is 0.2 to 0.9, and in a specific implementation, it can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. Under the condition of meeting the size requirement of welding deformation, the width a1 of the deformation release groove 1023 is 0.1 mm to 2 mm. In a specific implementation, the width a1 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, or 2 mm.
[0050] The deformation relief groove can be formed by punching, stamping and other processes, so as to improve the production efficiency of the material. In other embodiments, the shape of the deformation relief groove is not limited, so its cross section can be set to an arc, rectangle, triangle, trapezoid or irregular shape.
[0051] See also Figure 5 , Figure 6 The embodiment of the utility model further provides a battery, the battery 1 comprising a battery pin 10, a top cover 20 and a battery cell 30, wherein the battery cell 30 has a pole ear 301 and a pole 201, the top cover 20 is connected to the pole 201 of the battery cell 30, the first connection portion 101 of the battery pin 10 is electrically connected to the pole 201, and the second connection portion 102 of the battery pin 10 is electrically connected to the pole ear 301 of the battery cell 30.
[0052] To manufacture the above-mentioned battery 1, the following steps may be employed:
[0053] First, the first connection part 101 of the battery pin 10 is welded to the pole 201, and then the battery cell 30 is matched with the top cover 20; then the welding part 1022 of the second connection part 102 of the battery pin 10 is inserted into the pole ear 301 of the battery cell 30, so that the pole ear 301 and the surface of the welding part 1022 are fitted, and the pole ear 301 and the surface of the welding part 1022 are welded by ultrasonic welding technology. In the welding process, since the utility model optimizes the structural design of the battery pin 10, the extension or deformation problem that is easy to occur after the positive electrode pin is welded is successfully avoided, so that after the welding part 1022 is welded to the pole ear 301, the welding part 1022 can be flattened together with the pole ear 301 and set at a second preset angle; and there will be no problems such as size exceeding after extension.
[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A battery pin, used to connect the pole and the pole ear of a battery cell, characterized in that: include: A first connection part and a second connection part, the first connection part is electrically connected to the pole; the second connection part includes a connection part connected to the first connection part and a welding part located on at least one side of the connection part, the second connection part is connected to the pole ear through the welding part, and the welding part is provided with a deformation release structure.
2. The battery pin according to claim 1, characterized in that: The deformation relief structure includes a plurality of deformation relief grooves arranged at intervals.
3. The battery pin according to claim 2, characterized in that: A plurality of deformation relief grooves are arranged at intervals in the width direction and / or height direction of the welding portion.
4. The battery pin according to claim 2 or 3, characterized in that: The distance between two adjacently arranged deformation relief grooves is 0.5 mm to 3 mm.
5. The battery pin according to claim 2 or 3, characterized in that: The ratio of the total length of the deformation relief grooves arranged on the welding part along the height direction to the height of the welding part is 0.5 to 0.
95.
6. The battery pin according to claim 2 or 3, characterized in that: The ratio of the residual thickness of the welding part at the deformation relief groove to the total thickness is 0.2 to 0.
9.
7. The battery pin according to claim 2 or 3, characterized in that: The cross section of the deformation release groove is configured to be an arc, rectangle, triangle, trapezoid or irregular shape.
8. The battery pin according to claim 1, characterized in that: The deformation relief structure is arranged on the side of the welding portion facing away from the pole ear.
9. The battery pin according to claim 2 or 3, characterized in that: The width of the deformation release groove is 0.1 mm to 2 mm.
10. A battery, characterized in that: It comprises the battery pin, top cover and battery cell as described in any one of claims 1 to 9, the battery cell has a pole ear and a pole, the top cover is connected to the pole of the battery cell, the first connecting part of the battery pin is electrically connected to the pole, and the second connecting part of the battery pin is electrically connected to the pole ear of the battery cell.