Current collecting member and unit cell

Abstract

The utility model discloses a kind of current collection components and monomer battery, current collection component includes: substrate, the substrate has first surface and second surface oppositely arranged, the first surface is equipped with the convex part of protruding away from the second surface, the outer surface of the convex part is arc surface, the second surface is equipped with the groove extending towards the direction where the convex part is located, the bottom surface of the groove passes through the curvature center of the arc surface or is located below the curvature center of the arc surface.The current collection component of the utility model.The current collection component of the utility model has good welding effect, reduces the advantages such as defective rate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a current collector and a single battery cell. Background Technology

[0002] All-tab technology is a key point to improve the performance of cylindrical cells. In the design of all-tab for large and small cylindrical cells, a current collector (usually a sheet metal piece) is usually needed to connect the tab at one end of the core and then lead the electrical connection to the positive and negative terminals of the battery casing.

[0003] Currently, the welding of electrode tabs and current collector components typically employs through-welding. A laser beam enters from one side of the current collector, heating the component plate and creating a molten pool. This molten pool penetrates the current collector and contacts the electrode tab on the other side, where it solidifies and connects.

[0004] During penetration welding, the molten pool penetrates the current collector to a depth greater than or equal to its thickness. Since slag can form wherever the molten pool reaches, it may accumulate between the current collector and the tab. Because the slag is made of the same metal as the current collector, this slag can easily enter the battery core, causing self-discharge and internal short circuits, thus posing a safety risk. Utility Model Content

[0005] One objective of this invention is to provide a current collector that can at least solve the technical problem of existing technologies that use through welding to introduce welding slag inside the battery cell, thereby increasing the self-discharge rate and internal short-circuit risk of the battery cell.

[0006] Another objective of this invention is to provide a method for welding electrode tabs.

[0007] Another objective of this invention is to provide a single-cell battery including the aforementioned current collector.

[0008] To achieve the above objectives, the present invention provides the following technical solution.

[0009] According to a first aspect of the present invention, a current collection component includes: a substrate having a first surface and a second surface disposed opposite to each other; the first surface having a protrusion protruding away from the second surface; the outer surface of the protrusion being an arc-shaped surface; and the second surface having a groove extending toward the direction of the protrusion; the center of curvature of the arc-shaped surface passing through the bottom surface of the groove or located inside the space of the groove.

[0010] Optionally, the outer surface of the protrusion is arc-shaped, and / or the bottom surface of the groove is a plane; and / or the outer contour of the longitudinal section of the groove is an inverted trapezoid.

[0011] Optionally, the outer surface of the protrusion is arc-shaped, the outer contour of the longitudinal section of the groove is an inverted trapezoid, the maximum distance between the second surface and the outer surface of the protrusion is H, and the maximum distance between the bottom surface of the groove and the outer surface of the protrusion is T. max ,0.3mm≤H≤2.0mm,0.1mm≤T max ≤0.5mm.

[0012] Optionally, the substrate is a circular flat plate.

[0013] Optionally, the protrusion is a strip-shaped protrusion and is arranged radially along the substrate. The width of the protrusion is a fixed value or gradually increases from the center of the substrate to the edge of the substrate along the diametrical direction.

[0014] Optionally, the number of protrusions and grooves are multiple and correspond one-to-one.

[0015] Optionally, the plurality of protrusions are arranged in a ring-shaped radiating pattern with the center of the substrate as the center point.

[0016] A single-cell battery according to a second aspect of the present invention includes: a housing and a cell, the cell being located within the housing; and a current collector according to any of the above-described embodiments, wherein a protrusion of the current collector is connected to a tab of the cell.

[0017] Optionally, the flow collecting component is disposed on the bottom surface of the flow collecting plate, the bottom cover, or the cup-shaped shell.

[0018] According to the current collector component of this utility model embodiment, a protrusion is provided on the first surface of the substrate, and a groove is provided on the second surface. Through the interaction of the protrusion and the groove, on the one hand, the outer surface of the protrusion is arc-shaped and has no sharp areas, so it is not easy to generate debris and particles when pressing in the electrode tab. On the other hand, in the heat conduction welding process, heat conduction is transmitted outward from the molten pool as the center. Therefore, compared with the planar boss of the prior art, the distance difference between different positions on the contact surface of the arc-shaped protrusion and the molten pool is smaller, so the effective welding area generated is larger, and the welding effect is better and more stable.

[0019] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0021] Figure 1 This is a partial cross-sectional view of a current-collecting component according to an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of a current collection component at one angle according to an embodiment of the present invention;

[0023] Figure 3 This is a structural schematic diagram of a current collection component according to an embodiment of the present invention from another angle;

[0024] Figure 4 This is a partial structural schematic diagram of a single cell battery according to an embodiment of the present invention;

[0025] Figure 5 This is a partial structural schematic diagram of a single battery cell according to an embodiment of the present invention;

[0026] Figure 6 This is a cross-sectional view of a single cell according to an embodiment of this application;

[0027] Figure 7 This is an exploded view of a single cell battery according to an embodiment of this application from one angle;

[0028] Figure 8 This is an exploded view of a single cell battery according to an embodiment of this application from another angle;

[0029] Figure 9 This is a cross-sectional view of a single cell according to yet another embodiment of this application;

[0030] Figure 10 An exploded view of a single cell battery according to yet another embodiment of this application;

[0031] Figure 11 This is an exploded view of a single cell battery according to yet another embodiment of this application from yet another angle;

[0032] Figure 12 This is a schematic diagram showing the current collector and the electrode connected by laser welding according to an embodiment of this application.

[0033] Attached icon number

[0034] 100 for a single cell;

[0035] Current collector 10; substrate 11; first surface 111; second surface 112; protrusion 113; molten pool 1131; heat-affected zone 1132; effective welding area 1133; groove 114; bottom surface 1141;

[0036] 20 housing; 31 electrode tab; 40 top cover; 50 collector plate; 60 winding core; 70 bottom cover. Detailed Implementation

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0038] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0040] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0042] The current collection component 10 according to an embodiment of the present utility model is described in detail below with reference to the accompanying drawings.

[0043] like Figures 1 to 12 As shown, the current collection member 10 according to an embodiment of the present utility model includes: a substrate 11.

[0044] Specifically, the substrate 11 has a first surface 111 and a second surface 112 disposed opposite to each other. The first surface 111 is provided with a protrusion 113 that protrudes away from the second surface 112. The outer surface of the protrusion 113 is an arc-shaped surface. The second surface 112 is provided with a groove 114 extending toward the direction of the protrusion 113. The center of curvature of the arc-shaped surface passes through the bottom surface of the groove 114 or is located inside the space of the groove 114. For example, the opening of the groove 114 is upward, the protrusion 113 protrudes downward, and the bottom surface 1141 of the groove 114 passes through the center of curvature of the arc-shaped surface or is located below the center of curvature of the arc-shaped surface.

[0045] In other words, the current collecting member 10 according to the embodiment of the present invention includes a substrate 11, that is, the current collecting member 10 has a substrate 11, such as a circular flat plate. The substrate 11 can be part of the bottom surface of a current collecting plate, a bottom cover, a cup-shaped shell, etc. The substrate 11 includes a first surface 111 and a second surface 112, which are disposed opposite to each other. For example, the upper surface of the substrate 11 is the second surface 112, and the lower surface is the first surface 111.

[0046] The first surface 111 has a protrusion 113, and the second surface 112 has a groove 114. The outer surface of the protrusion 113 is arc-shaped, and the bottom surface 1141 of the groove 114 passes through or below the center of curvature of the arc-shaped surface. For example, a portion of the groove 114 extends through the first surface 111 into the protrusion 113. In other words, the protrusion 113 extends away from the first surface 111, and at least a portion of the orthographic projection of the protrusion 113 onto the substrate 11 coincides with the orthographic projection of the groove 114 onto the substrate 11. During welding, the laser can enter the bottom surface 1141 of the groove 114 through the opening of the groove 114. For example, the substrate 11 extends horizontally, the protrusion 113 is located on the lower surface of the substrate 11 and extends downwards, and the lower surface of the protrusion 113 has a slightly curved shape. The groove 114 extends in a downward direction, the bottom surface 1141 of the groove 114 is located below the first surface 111, and the bottom surface 1141 of the groove 114 is located above the center of curvature of the lower surface of the protrusion 113.

[0047] It is understandable that, since the bottom surface 1141 of the groove 114 passes through the center of curvature of the arc surface or below the center of curvature of the arc surface, when the laser enters the bottom surface 1141 of the groove 114 to form a molten pool 1131, due to the shape of the molten pool 1131 and the heat conduction process, the heat-affected zone 1132, in cross-section, is a fan-shaped area that bends toward the opening direction of the groove 114, and the center of curvature of the arc surface is close to the bottom surface 1141 of the groove 114. Therefore, at least a part of the arc surface has the same bending direction as the fan-shaped area, thereby making the difference in distance between the molten pool 1131 and multiple positions on the outer surface of the arc surface of the protrusion 113 smaller. Consequently, the difference in distance between different positions on the contact surface between the protrusion 113 and the tab 31 and the molten pool 1131 is also smaller.

[0048] When the current collector 10 of this embodiment is applied to a single battery cell 100, the connection between the protrusion 113 and the tab 31 can be achieved by thermal conductive welding. For example, the outer surface of the protrusion 113 is an arc-shaped surface with an arc-shaped welding area, and this arc-shaped welding area contacts the tab 31, resulting in a large contact area. The laser output from the laser can pass through the opening of the groove 114 and enter the bottom surface 1141 of the groove 114, forming a molten pool 1131 in the area where the protrusion 113 connects to the bottom surface 1141 of the groove 114. This molten pool 1131 is spaced apart from the arc-shaped welding area and can conduct heat, thus achieving the connection between the protrusion 113 and the tab 31. It can be seen that the current collector 10 of this embodiment optimizes the welding effect under the thermal conductive welding process.

[0049] In the thermal conductive welding process, a laser is injected from one side of the current collector 10 into the opening of the groove 114, heating the inner side of the protrusion 113 and generating a molten pool 1131. However, the molten pool 1131 does not penetrate the welding area of ​​the current collector 10; instead, the welding surface (i.e., the contact surface between the protrusion 113 and the tab 31) is connected through heat conduction. At this time, the molten pool 1131 does not directly contact the tab 31; instead, the heat-affected zone 1132 contacts the tab 31. Therefore, the thermal conductive welding process does not generate weld slag between the current collector 10 and the tab 31, thus not affecting battery safety. The effective welding area 1133 of this application is an arc-shaped surface, which can improve the effective welding range. In contrast, the welding contact surface between the current collector and the tab 31 in the prior art is a plane, resulting in a smaller effective welding range and uneven temperature distribution between the center and the edge within the welding range, affecting the welding effect.

[0050] Therefore, in this embodiment, by providing a protrusion 113 on the first surface 111 of the substrate 11 and a groove 114 on the second surface 112, the protrusion 113 and the groove 114 cooperate with each other. On the one hand, the outer surface of the protrusion 113 is arc-shaped and has no sharp areas, making it less likely to generate debris and particles when pressing in the tab 31. On the other hand, during the heat conduction welding process, heat conduction is transmitted outward from the molten pool 1131 as the center. Therefore, compared with the planar boss of the prior art, the distance difference between the protrusion 113 on the arc-shaped outer surface and the molten pool 1131 is smaller at different positions on the contact surface, resulting in a larger effective welding area and better and more stable welding effect.

[0051] According to one embodiment of the present invention, the outer surface of the protrusion 113 is arc-shaped, that is, the outer surface shape of the protrusion 113 is arc-shaped. In other words, in a partial cross-sectional view of the current collector 10, the cross-section of the protrusion 113 is arc-shaped. This arc shape has the same curvature direction as the fan-shaped heat-affected zone 1132. For example, the longitudinal section of the protrusion 113 is semi-arc-shaped. The arc-shaped protrusion 113 can be pressed into the tab 31 more easily, so that the welding area of ​​the current collector and the tab 31 fit tightly together, improving the welding effect. At the same time, the protrusion 113 on the arc-shaped outer surface has no sharp parts, so it is not easy to generate debris and particles when pressing into the tab 31.

[0052] In some specific embodiments of this utility model, the bottom surface 1141 of the groove is a plane, which facilitates focusing during laser incidence and improves the stability of the process.

[0053] In some specific embodiments of this utility model, the outer contour of the longitudinal section of the groove 114 is an inverted trapezoid. That is, the bottom of the groove 114 is a plane, and the width of the groove 114 should decrease with the increase of the depth. In other words, in the partial cross-sectional view of the current collecting member 10, the cross-section of the groove 114 is a trapezoid. For example, the outer contour of the longitudinal section of the groove 114 includes an upper base and a lower base, with the upper base being larger than the lower base. In this embodiment, by using a groove 114 with a larger opening area, the light path of the laser can be avoided, preventing the sidewalls of the groove 114 from blocking part of the laser light path and affecting the energy input during welding.

[0054] It is understandable that, in specific settings, one or more of the above conditions can be selected to achieve different product designs. For example, the outer surface of the protrusion 113 can be an arc-shaped surface, and the vertical cross section of the groove 114 can be an inverted trapezoid.

[0055] In some specific embodiments of this utility model, such as Figure 1 As shown, the outer surface of the protrusion 113 is arc-shaped, the outer contour of the longitudinal section of the groove 114 is an inverted trapezoid, the maximum distance between the second surface 112 and the outer surface of the protrusion 113 is H, and the maximum distance between the bottom surface 1141 of the groove 114 and the outer surface of the protrusion 113 is T. max 0.3mm ≤ H ≤ 2.0mm, for example, H is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm, etc.; 0.1mm ≤ T max ≤0.5mm, for example, T maxThe thickness can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc. For example, the total height of the protrusion 113 is H, where H satisfies 0.3mm ≤ H ≤ 2.0mm; the thickness of the thickest part at the bottom center of the groove 114 is T. max T max Satisfying 0.1mm≤T max ≤0.5mm. In this embodiment, the current collector 10 can be further optimized to further improve the welding effect of heat-conducting welding and reduce the probability of defects. Moreover, it can further reduce the distance difference between different positions on the contact surface of the protrusion 113 and the electrode 31 and the molten pool 1131, further increase the effective welding area, and make the welding effect better and more stable.

[0056] According to one embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the substrate 11 is a circular flat plate, for example, extending in a horizontal direction, and has versatility.

[0057] In some specific embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the protrusion 113 is a strip-shaped protrusion. The elongated protrusion can be easily pressed into the tab 31, so that the welding area of ​​the current collector 10 and the tab 31 fit tightly together, improving the welding effect. The protrusion 113 is arranged radially along the substrate 11. The width of the protrusion 113 is a fixed value or gradually increases from the center of the substrate 11 to the edge of the substrate 11 along the diameter direction. That is, the strip-shaped protrusion is arranged radially along the disk, and its width can remain a fixed value or increase along the diameter direction. The product shape corresponding to this utility model embodiment is diversified, which can meet different welding requirements in different positions.

[0058] According to one embodiment of the present invention, such as Figure 3 As shown, there are multiple protrusions 113 and grooves 114, each corresponding to a specific protrusion. For example, there are six protrusions 113 and six grooves 114. In the vertical direction, the six protrusions 113 correspond one-to-one with the six grooves 114, with each protrusion 113 located directly below a groove 114. For instance, on the side of the substrate 11 facing the winding core and in contact with it, one or more strip-shaped protrusions 113 are provided. On the other side of the substrate 11, corresponding grooves 114 should be provided at positions corresponding to the protrusions 113, and the projection of the grooves 114 perpendicular to the substrate 11 should be within the protrusions 113. In this embodiment, by employing multiple protrusions 113 and grooves 114, the connection reliability at multiple locations can be improved.

[0059] In some specific embodiments of this utility model, multiple protrusions 113 are arranged in a ring-shaped radiating pattern with the center of the substrate 11 as the center point, which can tightly weld multiple areas.

[0060] This utility model also discloses a method for welding electrode tabs, including the following steps:

[0061] The current collector 10 and the tab 31 are attached together, and the protrusion 113 is pressed into the tab 31, so that the tab 31 is tightly attached to the arc-shaped welding area on the outer surface of the protrusion 113. For example, the tab surfaces of the current collector 10 and the core are attached together, and the arc-shaped protrusion 113 is completely pressed into the tab 31 to ensure a tight fit between the welding area of ​​the tab 31 and the current collector 10.

[0062] The laser beam enters the bottom surface 1141 of the groove 114 from one side of the location of the second surface 112, as shown below. Figure 12 As shown, heating and melting a portion of the protrusion 113 forms a molten pool 1131. The molten pool 1131 does not penetrate the welding area, but connects the arc-shaped welding area of ​​the protrusion 113 to the interface where the tab 31 is attached through heat conduction. For example, a laser is incident from the other side of the current collector 10 to the bottom center of the groove 114, heating and melting a portion of the material of the current collector 10 to form a molten pool 1131. The molten pool 1131 does not penetrate the welding area, but forms an effective connection at the interface where the tab 31 and the current collector 10 are attached through heat conduction.

[0063] In this embodiment, thermal conductive welding is used, which has the following advantages: thermal conductive welding requires less heat input than penetration welding, so the possibility of damage to the core 60 caused by local high temperature during the welding process is smaller; the molten pool 1131 of thermal conductive welding is shallow and does not reach the tab 31, so no slag is generated at the tab 31 during the welding process, which would affect the subsequent safety of the battery; when thermal conductive welding is performed on the bottom of the battery casing or the bottom cover 70, since the molten pool 1131 does not penetrate the welding area, the airtightness of the weld position after welding can be guaranteed, and air leakage is not likely to occur; thermal conductive welding has lower requirements for the energy density per unit area of ​​the laser output, that is, lower technical requirements for the laser, and can use a lower cost laser.

[0064] Moreover, since the heat conduction process in the heat conduction process is transmitted outward from the molten pool 1131 as the center, according to the welding method of the tab 31 in this embodiment of the present invention, the distance difference between the protrusion 113 with the arc-shaped cross section and the molten pool 1131 at different positions on the contact surface with the tab 31 is smaller than that of the planar boss. Therefore, the effective welding area generated will be larger, and the welding effect will be better and more stable.

[0065] In addition, the welding process of this utility model embodiment is not only applicable to full-tab cores that are directly wound without additional treatment, but also applicable to other tab designs, such as cores with cut and stacked tabs and rolled tabs.

[0066] like Figures 6 to 11 As shown, this utility model also discloses a single-cell battery 100, including: a housing 20, a cell, and a current collector 10. The cell is located inside the housing 20, and the current collector 10 is a current collector 10 according to any of the above embodiments. The protrusion 113 of the current collector 10 is connected to the electrode tab 31 of the cell. Since the single-cell battery 100 of this utility model embodiment includes the above-mentioned current collector 10, and the current collector 10 has the advantage of good welding effect, the single-cell battery 100 of this utility model embodiment also has the above-mentioned advantages, which will not be elaborated here.

[0067] According to one embodiment of the present invention, the current collecting component 10 is disposed on the bottom surface of the current collecting plate 50, the bottom cover 70, or the cup-shaped shell 20, etc. That is, the current collecting component 10 can be part of the bottom surface of the current collecting plate 50, the bottom cover 70, or the cup-shaped shell, etc., or it can be the bottom surface of the current collecting plate 50, the bottom cover 70, or the cup-shaped shell, etc.

[0068] For example, such as Figures 6 to 8 As shown, the single-cell battery 100 is a cylindrical battery, comprising a top cover 40, a current collector 50, a coil 60, and a casing 20. The top cover 40 is a disc with a central opening for an electrode post, and an insulating layer exists between the electrode post and the top cover 40. The current collector 50 is a disc and has the current collector component 10 described in the above embodiment. The coil 60 has different polarities at both ends. The casing 20 is cup-shaped, with the current collector component 10 described in the above embodiment at its bottom. During assembly, the current collector 50 and the coil 60 are first welded together using thermal conductive welding. Then, the coil 60 and the electrode post of the top cover 40 are welded together. Next, the coil 60 is inserted into the casing 20, and the bottom of the casing and the coil 60 are welded together using thermal conductive welding. Finally, the top cover 40 and the periphery of the casing 20 are welded together to complete the assembly.

[0069] For example, such as Figures 9 to 11 As shown, the single-cell battery 100 is a cylindrical battery, including a casing 20, a current collector 50, a coil 60, and a bottom cover 70. The current collector 50 and the bottom cover 70 are both discs, each having a current collector component 10 as described in the above embodiment. The casing 20 is cup-shaped, with an opening at the center of the bottom for a terminal post. An insulating layer exists between the terminal post and the top cover 40. The coil 60 has different polarities at both ends. During assembly, the current collector 50 and the coil 60 are first welded together using thermal conductive welding. Then, the coil 60 is installed into the casing 20. Next, the current collector 50 and the terminal post of the top cover 40 are welded together. Then, the bottom cover 70 is installed, and the bottom cover 70 is welded to the periphery of the casing 20. Finally, the bottom cover 70 and the coil 60 are welded together using thermal conductive welding to complete the assembly.

[0070] In summary, the current collector 10 according to the present invention provides a protrusion 113 on the first surface 111 of the substrate 11 and a groove 114 on the second surface 112. Through the cooperation of the protrusion 113 and the groove 114, not only are it less likely to generate debris and particles when pressing in the tab 31, but the welding effect is also better and more stable.

[0071] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A current collecting member characterized by comprising: include: The substrate has a first surface and a second surface disposed opposite to each other. The first surface has a protrusion that protrudes away from the second surface. The outer surface of the protrusion is an arc-shaped surface. The second surface has a groove extending in the direction of the protrusion. The center of curvature of the arc-shaped surface passes through the bottom surface of the groove or is located inside the space of the groove.

2. The current collecting member according to claim 1, characterized by The outer surface of the protrusion is arc-shaped, and / or the bottom surface of the groove is flat; and / or the outer contour of the longitudinal section of the groove is an inverted trapezoid.

3. The current collecting member according to claim 2, characterized by The outer surface of the protrusion is arc-shaped, the outer contour of the longitudinal section of the groove is an inverted trapezoid, the maximum distance between the second surface and the outer surface of the protrusion is H, and the maximum distance between the bottom surface of the groove and the outer surface of the protrusion is T. max ,0.3mm≤H≤2.0mm,0.1mm≤T max ≤0.5mm.

4. The current collecting member according to any one of claims 1 to 3, characterized by The substrate is a circular flat plate.

5. The current collecting member according to claim 4, characterized by The protrusion is a strip-shaped protrusion and is arranged radially along the substrate. The width of the protrusion is a fixed value or gradually increases from the center of the substrate to the edge of the substrate along the diameter direction.

6. The current collecting member according to claim 5, characterized by The number of protrusions and the number of grooves are both multiple and correspond one-to-one.

7. The current collecting member according to claim 6, characterized by The multiple protrusions are arranged in a ring-shaped radiating pattern with the center of the substrate as the center point.

8. A single cell characterized by, include: A housing and a battery cell, wherein the battery cell is located within the housing; According to any one of claims 1-7, the protrusion of the current collector is connected to the tab of the battery cell.

9. The cell according to claim 8, wherein The current collection component is located on the bottom surface of the current collection plate, bottom cover, or cup-shaped shell.

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