Tab, pole piece assembly and battery
By designing the puncture part of the tab to pierce into the current collector and connect to the electrode at room temperature, the problems of burrs and high internal resistance when connecting the tab and the electrode are solved, achieving the effects of simplified processing, enhanced connection strength and reduced battery internal resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-03-03
- Publication Date
- 2026-05-15
AI Technical Summary
In the prior art, burrs are easily generated when the tabs are connected to the electrode plates, which can cause short circuits in the battery. In addition, the small contact area between the protrusions and the grooves results in a large internal resistance in the battery.
Design an electrode tab with a puncture part that can directly pierce into the current collector and connect to the electrode at room temperature, avoiding burr formation. The acute angle increases the contact area, enhances the mechanical connection strength, and reduces internal resistance.
This achieves a simplified connection between the electrode and the tab at room temperature, reducing processing costs, enhancing connection strength, reducing power loss, lowering battery internal resistance, and improving safety performance.
Smart Images
Figure CN224248887U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to tabs, electrode assemblies, and batteries. Background Technology
[0002] In related technologies, tabs are connected to the electrode sheets via ultrasonic welding, laser welding, or other methods. During the welding process, the high temperatures can cause burrs to form on the side of the tab facing away from the electrode sheet. These burrs can easily pierce the separator adjacent to the electrode sheet, leading to a short circuit in the battery. To address this issue, some technologies use conductive adhesive to fix the tabs to the current collector of the electrode sheet. Furthermore, to reduce battery impedance, some technologies incorporate mating protrusions and grooves on the tabs and current collector. However, due to limitations in the thickness of the current collector, the contact area between the protrusions and grooves is small, resulting in a still relatively high overall internal resistance of the battery. Utility Model Content
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a tab that can reduce the internal resistance of the battery.
[0004] This utility model also proposes an electrode assembly having the aforementioned tabs.
[0005] This utility model also proposes a battery having the above-mentioned electrode assembly.
[0006] The electrode tab according to a first aspect embodiment of the present invention includes:
[0007] The main body has a set thickness;
[0008] A puncture portion, connected to the body, has a protruding end on the side of the puncture portion opposite to the body in the thickness direction of the body, the protruding end being used to puncture into the manifold.
[0009] The tab according to the present invention has at least the following beneficial effects: the puncture portion connected to the body can directly pierce into the current collector through the protruding end, so that the electrode sheet and the tab are connected, and the electrode sheet can conduct electrical energy to the body through the puncture portion piercing the current collector. The above process can achieve the connection between the electrode sheet and the tab at room temperature, avoid the generation of burrs on the side of the body away from the puncture portion, and eliminate the need to set corresponding grooves on the electrode sheet, further simplifying the connection process between the tab and the electrode sheet, and effectively reducing the processing cost of connecting the tab and the electrode sheet. Furthermore, since the protruding end has an acute angle relative to the thickness direction of the body, the puncture portion piercing the current collector also has an acute angle relative to the thickness direction of the current collector. The puncture portion can utilize the space of the current collector perpendicular to the thickness direction, increase the contact area between the puncture portion and the current collector, enhance the mechanical connection strength between the puncture portion and the current collector, reduce the loss of electrical energy from the current collector of the electrode sheet to the puncture portion of the tab, and reduce the internal resistance of the battery.
[0010] According to some embodiments of the present invention, the puncture portion includes a first puncture section, which is a cone and has the protruding end.
[0011] According to some embodiments of the present invention, the puncture portion further includes a second puncture segment, the first puncture segment and the second puncture segment are arranged along a first direction, the first direction being the direction away from the body, the protruding end facing the first direction, the second puncture segment being a column extending along the first direction, one end of the second puncture segment being connected to the body, and the other end being connected to the first puncture segment.
[0012] According to some embodiments of the present invention, the body also has a set length and has a first end and a second end in the length direction of the body. The side of the body near the first end is used for electrical connection of external devices, and the protruding end of the puncture part is inclined toward the first end.
[0013] According to some embodiments of the present invention, the puncture portion is formed by stamping a portion of the electrode tab.
[0014] The electrode assembly according to a second aspect embodiment of the present invention includes:
[0015] Electrode;
[0016] The tab as described in any of the above embodiments.
[0017] According to some embodiments of the present invention, the electrode includes a current collector, the puncture portion is inserted into the current collector, and the body is adhered to the current collector.
[0018] The electrode assembly according to this utility model embodiment has at least the following beneficial effects: the puncture portion connected to the body can directly pierce into the current collector through the protruding end, thereby connecting the electrode to the electrode tab, and the electrode can conduct electrical energy to the body through the puncture portion piercing the current collector. The above process can achieve the connection between the electrode and the electrode tab at room temperature, avoiding burrs on the side of the body away from the puncture portion, and eliminating the need for corresponding grooves on the electrode. The connection process between the electrode tab and the electrode is further simplified, effectively reducing the processing cost of connecting the electrode tab and the electrode. The electrical energy on the electrode can flow into the electrode tab through the connection between the puncture portion and the electrode, thereby providing electrical energy to the outside.
[0019] According to some embodiments of the present invention, at least a portion of the puncture portion is inserted into the collector fluid, and the body is adhered to the collector fluid.
[0020] According to some embodiments of the present invention, the electrode assembly further includes a first adhesive layer, which is located between the body and the current collector and is used to bond the body and the current collector.
[0021] The battery according to a third aspect of the present invention is characterized in that it includes an electrode assembly as described in any of the above embodiments.
[0022] The battery according to the embodiments of this utility model has at least the following beneficial effects: the puncture portion connected to the main body can directly pierce into the current collector through the protruding end, so that the electrode and the tab are connected, and the electrode can conduct electrical energy to the main body through the puncture portion piercing the current collector. The above process can achieve the connection between the electrode and the tab at room temperature, avoid the generation of burrs on the side of the main body away from the puncture portion, and eliminate the need to set corresponding grooves on the electrode. The connection process between the tab and the electrode is further simplified, effectively reducing the processing cost of connecting the tab and the electrode, simplifying the overall assembly process of the battery, and giving the battery higher safety performance.
[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0025] Figure 1 This is a schematic diagram of the electrode tabs of some embodiments of the first aspect of this utility model;
[0026] Figure 2 for Figure 1 A magnified view shown at point A in the middle;
[0027] Figure 3for Figure 1 A schematic diagram of the middle pole ear viewed from another direction;
[0028] Figure 4 This is a schematic diagram of the electrode tabs according to some embodiments of the second aspect of this utility model;
[0029] Figure 5 This is a schematic diagram of an electrode assembly according to some embodiments of the third aspect of this utility model.
[0030] Figure label:
[0031] The electrode 100, the body 110, the first end 111, the second end 112, the puncture part 120, the first puncture segment 121, the protruding end 1212, and the second puncture segment 122;
[0032] Electrode 200, current collector 210, first adhesive layer 220. Detailed Implementation
[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0038] Existing technologies propose using conductive adhesive to bond the tabs to the current collector of the electrode sheet for fixation. To further reduce battery impedance, some technologies also incorporate hemispherical protrusions and grooves on the tabs and current collector for mutual engagement. During the assembly of these tabs and current collectors, workers not only need to use conductive adhesive to bond them but also need to insert the hemispherical protrusion of the tab into the spherical groove of the current collector. This approach requires separate fabrication of the hemispherical protrusion and groove using specialized equipment, as well as positioning of these elements during assembly, resulting in high processing costs. Furthermore, the contact area between the protrusion and groove surfaces is relatively small, leading to a still relatively high overall internal resistance of the battery.
[0039] In view of this, please refer to Figures 1 to 5 As shown, this utility model proposes an electrode tab 100, which includes a body 110 and a puncture part 120.
[0040] Please refer to Figure 1 , Figure 2 As shown, the body 110 of the tab 100 of this utility model has a set thickness (the thickness direction of the body 110 is also...). Figure 1 , Figure 2 (Up and down direction in the middle). The puncture part 120 of this utility model is connected to the body 110. In the thickness direction of the body 110, the side of the puncture part 120 opposite to the body 110 has a protruding end 1212, which is used to pierce into the collector.
[0041] The puncture portion 120, connected to the body 110, can directly pierce into the current collector through the protruding end 1212, connecting the electrode to the tab 100. The electrode can then conduct electrical energy to the body through the puncture portion 120 inserted into the current collector. This process allows the electrode to be connected to the tab 100 at room temperature, preventing burrs from forming on the side of the body 110 away from the puncture portion 120. Furthermore, it eliminates the need for corresponding grooves on the electrode, further simplifying the connection process between the tab 100 and the electrode and effectively reducing the processing cost of connecting the tab 100 and the electrode.
[0042] Specifically, please refer to Figure 2 As shown, where Figure 2 The first included angle B is shown. The first included angle B is the angle between the orientation of the protruding end 1212 of this invention and the thickness direction of the body 110, and is greater than 0 degrees and less than 90 degrees. That is, the orientation of the protruding end 1212 of this invention has an acute included angle relative to the thickness direction of the body 110. Since the orientation of the protruding end 1212 has an acute included angle relative to the thickness direction of the body 110, the puncture part 120 that penetrates the current collector also has an acute included angle with the thickness direction of the current collector. The puncture part 120 can utilize the space of the current collector perpendicular to the thickness direction to increase the contact area between the puncture part 120 and the current collector, enhance the mechanical connection strength between the puncture part 120 and the current collector, reduce the loss of electrical energy from the current collector of the electrode sheet to the puncture part 120 of the tab 100, and reduce the internal resistance of the battery.
[0043] It should be noted that this utility model does not limit the specific shape of the body 110, and those skilled in the art can adjust the shape of the body 110. Please refer to... Figure 1 , Figure 2 As shown, in some embodiments, the body 110 is a cuboid structure with rectangular tabs commonly found in the prior art, and the body 110 has a set thickness (the thickness direction is also known as the thickness direction). Figure 1 (in the vertical direction), the side of the puncture section 120 opposite to the body 110 (that is...) Figure 1 The lower side of the body 110 has a protruding end 1212. In other embodiments, the body 110 is a tiered structure, the thickness direction of the body 110 is perpendicular to a plane of the tiered structure, the puncture portion 120 is connected to the plane, and the protruding end 1212 is located on the side away from the plane.
[0044] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the angle between the orientation of the protruding end 1212 and the thickness direction of the body 110. As a preferred embodiment, in some embodiments, the angle between the orientation of the protruding end 1212 and the thickness direction of the body 110 is 20 to 70 degrees (i.e., the first angle B is 20 to 70 degrees). When the angle between the orientation of the protruding end 1212 and the thickness direction of the body 110 is greater than or equal to 20 degrees, the contact area between the puncture portion 120 and the current collector 210 is also larger, which is beneficial for further reducing the internal resistance of the battery. When the angle between the orientation of the protruding end 1212 and the thickness direction of the body 110 is less than or equal to 70 degrees, the processing difficulty of the tab 100 is lower, which can reduce the overall processing cost of the battery. Without departing from the inventive concept of this utility model, those skilled in the art can adjust the structure of the puncture portion 120 to achieve the function of the protruding end 1212 piercing the current collector.
[0045] Please refer to Figure 1 As shown, in some embodiments, the puncture portion 120 includes a first puncture section 121, which is a cone and has a protruding end 1212. Because the first puncture section 121 is a cone structure, the protruding end 1212, which extends away from the body 110 in the extending direction, can pierce into the electrode 200. The puncture portion 120 can engage with the hole wall formed by the puncture of the electrode 200 through the first puncture section 121, thereby connecting the body 110 to the electrode 200 through the puncture portion 120. Compared to other structures, the cone surface of the cone can gradually expand a portion of the current collector structure in a direction perpendicular to the puncture direction during the insertion process, resulting in less resistance when installing the tab 100. During manual assembly, the above solution helps reduce the force required for manually installing the tab 100, reducing employee fatigue accumulated during long-term installation, thereby increasing the efficiency of connecting the tab 100 and the electrode, and reducing processing costs. During machine assembly, the above solution helps reduce the power required to connect the tab 100 and the electrode, thereby reducing energy expenditure and processing costs.
[0046] Further, please refer to Figure 4 As shown, in some embodiments, the puncture portion 120 further includes a second puncture segment 122. The first puncture segment 121 and the second puncture segment 122 are arranged along a first direction, which is the direction away from the body. The protruding end 1212 faces the first direction. The second puncture segment 122 is a column extending along the first direction. One end of the second puncture segment 122 is connected to the body 110, and the other end is connected to the first puncture segment 121. With the above solution, the puncture portion 120 can be engaged with the electrode 200 through the side of the second puncture segment 122. Since the second puncture segment 122 is a column extending along the first direction, after the puncture portion 120 pierces the current collector along the first direction, the side of the second puncture segment 122 can provide a larger contact area, which can further improve the connection strength between the puncture portion 120 and the electrode 200, and also reduce the loss of electrical energy flowing from the electrode 200 into the puncture portion 120. On the other hand, the portion of the current collector that contacts the side of the second puncture section 122 can also generate a frictional force on the second puncture section 122 in the opposite direction of the first direction, making it less likely for the puncture section 120 to move in the opposite direction of the first direction and reducing the possibility of the puncture section 120 falling off.
[0047] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the specific orientation of the first direction.
[0048] Further, please refer to Figure 4 As shown, where Figure 4The first included angle B is shown. In some embodiments, the orientation of the protruding end 1212 has a first included angle B with the thickness direction of the body 110. The first included angle B is greater than 0 degrees and less than 90 degrees. With the above scheme, both the first puncture segment 121 and the second puncture segment 122 are inclined relative to the body 110. The portion of the first puncture segment 121 and the second puncture segment 122 that penetrates the electrode 200 occupies a larger space in the thickness direction perpendicular to the body 110, and the contact area with the electrode 200 can also be increased. This is beneficial to increase the connection strength between the puncture portion 120 and the electrode 200, and reduce the loss of electrical energy flowing from the electrode 200 into the puncture portion 120.
[0049] Based on the above plan, please refer to Figure 4 As shown, the body 110 also has a set length (the length direction is also known as the length direction). Figure 4 (in the left-right direction), and has a first end 111 and a second end 112 in the length direction of the body 110. The side of the body 110 near the first end 111 is used for electrical connection to external devices, and the protruding end 1212 of the puncture part 120 is inclined toward the first end 111. Figure 4 Taking the tab 100 as an example, when the protruding end 1212 of the puncture portion 120 is inclined toward the first end 111, and the first end 111 is located on the right side of the body 110, the first direction of the puncture portion 120 inclined toward the first end 111 is parallel to the lower right direction. After the puncture portion 120 pierces the electrode 200, and the first end 111 of the tab 100 is pulled by the external device, the side of the second puncture segment 122 extending along the first direction will be resisted by the electrode facing the lower left, making the tab 100 less prone to loosening due to the pulling of the external device, which is beneficial to improving the battery's service life.
[0050] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the position of the puncture part 120 along the length of the body 110. Please refer to... Figure 4 As shown, in some embodiments, the puncture portion 120 is disposed on the side near the second end 112.
[0051] The puncture portion 120 of this invention can be formed in various ways. In some embodiments, the puncture portion 120 is formed by laser cleaning.
[0052] As a preferred embodiment, in some embodiments, the puncture portion 120 is partially stamped from the tab 100. The above solution can utilize existing tabs to process the puncture portion 120 at room temperature, which helps to reduce manufacturing costs and further avoids the formation of burrs on the tab during the formation of the puncture portion 120.
[0053] Specifically, taking a conventional rectangular tab as an example, in some embodiments, the puncture portion 120 is formed by extruding the rectangular tab as raw material in a mold. The upper mold has protrusions for extruding the rectangular tab, and the lower mold has grooves corresponding to the shape of the puncture portion 120. When processing using the above mold, a portion of the rectangular tab is extruded into the groove by the protrusions of the upper mold to form the puncture portion 120, and the portion not extruded by the protrusions of the upper mold forms the body 110.
[0054] Further, please refer to Figures 1 to 3 As shown, in some embodiments, the tab 100 includes multiple puncture portions 120, which are connected to the same side of the body 110 in the thickness direction, and the protruding ends 1212 face the same direction. Through this design, the multiple puncture portions 120 can all penetrate into the electrode sheet 200, allowing the tab 100 to be connected to the electrode sheet 200 via the multiple puncture portions 120, thereby strengthening the connection between the tab 100 and the electrode sheet 200.
[0055] Please refer to Figures 1 to 5 As shown, this utility model also proposes an electrode assembly, including an electrode 200 and an electrode tab 100 as described in any of the above embodiments. The electrode 200 includes a current collector 210. The piercing portion 120 connected to the body 110 can directly pierce into the current collector 210 through the protruding end 1212, so that the electrode 200 and the electrode tab 100 are connected. The electrode 200 can conduct electrical energy to the body 110 through the piercing portion 120 piercing into the current collector 210, thereby providing electrical energy to the outside. The above process can achieve the connection between the electrode 200 and the electrode tab 100 at room temperature, which can avoid the generation of burrs on the side of the body 110 away from the piercing portion 120, and does not require the provision of corresponding grooves on the electrode 200. The connection process between the electrode tab 100 and the electrode 200 is further simplified, effectively reducing the processing cost of connecting the electrode tab 100 and the electrode 200. Since the protruding end 1212 has an acute angle relative to the thickness direction of the body 110, the puncture part 120 that pierces the current collector 210 also has an acute angle with the thickness direction of the current collector 210. The puncture part 120 can utilize the space of the current collector 210 perpendicular to the thickness direction to increase the contact area between the puncture part 120 and the current collector 210, enhance the mechanical connection strength between the puncture part 120 and the current collector 210, reduce the loss of electrical energy from the current collector 210 of the electrode 200 to the puncture part 120 of the tab 100, and reduce the internal resistance of the battery.
[0056] Based on the above plan, please refer to Figure 5As shown, in some embodiments, at least a portion of the puncture portion 120 is inserted into the current collector 210, and the body 110 is also adhered to the current collector 210. Through this arrangement, the tab 100 can be connected to the electrode 200 via the puncture portion 120 penetrating the current collector 210 and the adhesion between the current collector 210 and the body 110. The connection strength between the tab 100 and the electrode 200 is higher, which helps to enhance the stability of the electrode assembly.
[0057] This invention does not limit the bonding method between the current collector 210 and the body 110. In some embodiments, the electrode assembly includes an adhesive member located on the side of the body 110 away from the electrode 200, and bonding the electrode 200 and the body 110. It should be noted that the electrode tab 100 of this invention achieves both mechanical and electrical connection through the snap-fit between the piercing portion 120 and the electrode 200. Electrical energy on the electrode 200 can flow into the body 110 through the piercing portion 120, and then flow to external devices. Therefore, the material of the adhesive member is not limited to the conductive adhesive commonly used in the prior art, but can also be acrylate, epoxy resin, polyurethane, silicone, epoxy resin, polyolefin, or polystyrene, etc. Using conventional non-conductive adhesives is more conducive to reducing the manufacturing cost of the electrode assembly.
[0058] As a preferred option, please refer to Figure 5 As shown, in some embodiments, the electrode assembly further includes a first adhesive layer 220, which is located between the body 110 and the current collector 210 and is used to bond the body 110 and the current collector 210. At least a portion of the puncture portion 120 penetrates the first adhesive layer 220 and pierces into the current collector 210. The first adhesive layer 220 disposed between the current collector 210 and the body 110 can apply an adhesive force to the body 110 close to the current collector 210, thereby preventing the body 110 from moving away from the current collector 210 and further strengthening the connection strength between the tab 100 and the electrode 200. On the other hand, the first adhesive layer 220, which is at least partially penetrated by the puncture portion 120, can also bond the puncture portion 120, further strengthening the connection strength between the puncture portion 120 and the current collector 210. The stability of the electrode assembly is further improved.
[0059] This invention also proposes a battery, which includes an electrode assembly as described in any of the above embodiments. The piercing portion 120, connected to the body 110, can directly pierce into the current collector 210 through the protruding end 1212, connecting the electrode 200 to the tab 100. The electrode 200 can conduct electrical energy to the body 110 through the piercing portion 120 piercing the current collector 210. This process enables the connection between the electrode 200 and the tab 100 at room temperature, avoiding burrs on the side of the body 110 away from the piercing portion 120. Furthermore, it eliminates the need for corresponding grooves on the electrode 200, further simplifying the connection process between the tab 100 and the electrode 200. This effectively reduces the processing cost of connecting the tab 100 and the electrode 200, simplifies the overall battery assembly process, and enhances the battery's safety performance. Since the protruding end 1212 has an acute angle relative to the thickness direction of the body 110, the puncture part 120 that pierces the current collector 210 also has an acute angle with the thickness direction of the current collector 210. The puncture part 120 can utilize the space of the current collector 210 perpendicular to the thickness direction to increase the contact area between the puncture part 120 and the current collector 210, enhance the mechanical connection strength between the puncture part 120 and the current collector 210, reduce the loss of electrical energy from the current collector 210 of the electrode 200 to the puncture part 120 of the tab 100, and lower the internal resistance of the battery.
[0060] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.
Claims
1. A tab, characterized in that, include: The main body has a set thickness; A puncture portion is connected to the body. In the thickness direction of the body, the side of the puncture portion opposite to the body has a protruding end. The protruding end is used to pierce into the manifold. The orientation of the protruding end has an acute angle relative to the thickness direction of the body.
2. The electrode tab according to claim 1, characterized in that, The puncture portion includes a first puncture section, which is a cone and has the protruding end.
3. The electrode tab according to claim 2, characterized in that, The puncture portion further includes a second puncture segment. The first puncture segment and the second puncture segment are arranged along a first direction, which is a direction away from the body. The protruding end faces the first direction. The second puncture segment is a column extending along the first direction. One end of the second puncture segment is connected to the body, and the other end is connected to the first puncture segment.
4. The electrode tab according to claim 3, characterized in that, The body also has a set length and has a first end and a second end in the length direction of the body. The side of the body near the first end is used for electrical connection to an external device, and the protruding end of the puncture part is inclined toward the first end.
5. The electrode tab according to claim 1, characterized in that, The puncture portion is formed by stamping a portion of the electrode tab.
6. The electrode tab according to claim 1, characterized in that, The angle between the orientation of the protruding end and the thickness direction of the body is 20 degrees to 70 degrees.
7. An electrode assembly, characterized in that, include: Electrodes, including current collectors; The tab as described in any one of claims 1 to 6.
8. The electrode assembly according to claim 7, characterized in that, At least a portion of the puncture portion is inserted into the collector fluid, and the body is adhered to the collector fluid.
9. The electrode assembly according to claim 8, characterized in that, The electrode assembly further includes a first adhesive layer located between the body and the current collector for bonding the body and the current collector; at least a portion of the puncture portion penetrates the first adhesive layer and pierces into the current collector.
10. A battery, characterized in that, include: The electrode assembly as described in any one of claims 7 to 9.