Cover plate structure and battery

Abstract

The application relates to a cover plate structure and a battery, and belongs to the technical field of batteries. The cover plate structure comprises a top cover sheet, a length direction, a width direction and a thickness direction are defined based on the top cover sheet, mounting hole positions are arranged on the top cover sheet, each mounting hole position is provided with a pole terminal which penetrates the mounting hole position on the top cover sheet, an insulating sealing assembly which is coaxially sleeved on the outer wall surface of the pole terminal, and a support piece which is press-fitted at the end face profile of the pole terminal on the side away from the external battery cell in the thickness direction; and the support piece and the pole terminal are connected through multi-point press riveting. The application utilizes multi-point press riveting connection to improve the connection strength, on the basis of the multi-point press riveting connection, a first insulating piece, a sealing piece and a second insulating piece are arranged in the thickness direction, so that the sealing property and stability of the cover plate structure and the battery are improved; the pole terminal and the pole lug are directly welded, the material of the pole terminal is reduced, the overall structure is simpler, and the space occupied in the thickness direction is smaller.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cover plate structure and a battery. Background Technology

[0002] In traditional cover plates, the pole terminal and the support are usually fixed by one or more fasteners, such as the assembly of fasteners such as screws; or by multi-step positioning, such as using positioning fixtures to assist assembly.

[0003] These fastening methods, due to the large number of components and high operational precision requirements, are prone to problems such as poor positioning accuracy and weakened connection reliability, which in turn affect the battery's sealing performance and conductivity. Summary of the Invention

[0004] Based on this, it is necessary to provide a cover plate structure and battery to address technical issues such as unstable sealing performance of the cover plate structure. A support member is set on the top cover plate, and the support member is riveted to the post on the terminal block using through holes. By using multi-point riveting and support member support, the high sealing performance and rigidity stability of the cover plate structure can be obtained.

[0005] The technical solution adopted in this application is as follows:

[0006] A first aspect of this application provides a cover plate structure, including a top cover sheet, the top cover sheet defining a length direction, a width direction, and a thickness direction.

[0007] Its characteristic is that: the top cover plate is provided with mounting holes, and each mounting hole is provided with:

[0008] The pole terminal passes through the mounting hole on the top cover plate.

[0009] An insulating and sealing assembly is coaxially sleeved on the outer wall surface of the electrode terminal.

[0010] A support member and the pole terminal clamp and limit the top cover sheet in the thickness direction of the top cover sheet, and the support member and the pole terminal are connected by multiple points of pressure riveting.

[0011] In the above technical solution, several riveting points are set on the support member, and the support member and the pole terminal are connected by multiple riveting points. The connection strength can be improved by increasing the number of connection points. On the basis of the main support provided by the top cover plate, an additional support member is added to connect with the pole terminal. The support member can further improve the local stiffness and overall strength of the cover plate structure. At the same time, an insulating sealing assembly is arranged to ensure the sealing performance of the cover plate structure.

[0012] The top cover plate has mounting holes, which can be one, two, or more. The more mounting holes there are, the more corresponding press-fit connection points there are, and the higher the stability of the cover plate structure.

[0013] As a further improvement to the above technical solution:

[0014] In some embodiments, the pole terminal includes:

[0015] Welding substrate,

[0016] The first terminal boss is formed on the surface of the welding substrate facing the support member in the thickness direction.

[0017] The second terminal boss is formed on the side of the first terminal boss facing the support member in the thickness direction.

[0018] A plurality of rivet posts are provided; the rivet posts are located on the side of the first terminal boss facing the support member in the thickness direction, and the rivet posts penetrate the support member and are press-fitted to the support member.

[0019] In the above technical solution, the pole terminal adopts a multi-protrusion structure. These multi-protrusion structures provide an installation base for the insulation and sealing assembly. The pole terminal, the insulation and sealing assembly and the mounting hole of the top cover plate are matched in shape, forming a mutual interlocking and limiting structure in the thickness direction. The overall stability of the cover plate structure is high.

[0020] In some embodiments, the riveting posts are arranged in a circumferential array with the second terminal boss as the center.

[0021] In the above technical solution, the riveting posts are arranged in a circumferential array on the top surface of the first terminal boss, which applies a uniform limiting force to the pole terminal and the support at this location, so that the support is subjected to equal force at all points. When pressed onto the top cover plate, the probability of local deformation of the top cover plate under force is lower.

[0022] In some embodiments, the support member includes:

[0023] A support boss is press-fitted onto the surface of the first terminal boss that is away from the top cover plate in the thickness direction; the riveting post is press-fitted onto the support boss on the surface of the support boss that is away from the top cover plate in the thickness direction.

[0024] A support substrate, wherein the support boss is formed on the surface of the support substrate facing away from the top cover sheet in the thickness direction; the support substrate is press-fitted into the insulating sealing assembly on the side facing away from the top cover sheet in the thickness direction.

[0025] In the above technical solution, the support member adopts a ring-shaped member with a protruding structure. Compared with directly using a flat ring-shaped member, the height difference between the support boss and the support base plate is beneficial for pressing onto the end face of other components to form a displacement limit.

[0026] In some embodiments, the top cover sheet includes:

[0027] The mounting holes penetrate the sheet body.

[0028] A recessed groove is formed on the surface of the mounting hole on the side opposite to the support member in the thickness direction, and the mounting hole penetrates the bottom of the recessed groove.

[0029] Ribs are formed on the surface of the sheet body facing the support member in the thickness direction, and the ribs form a closed contour.

[0030] In the above technical solution, the concave bosses and ribs of the top cover plate can play a role in displacement limiting. The concave bosses and ribs can provide more assembly surfaces, cooperate with structures such as insulation and sealing components, and play a role in gradual assembly and gradual limiting, so that each component can be effectively limited.

[0031] In some embodiments, the insulating sealing assembly includes:

[0032] The first insulating element is assembled on the surface of the sheet body facing the support member in the thickness direction, and is located inside the closed contour formed by the rib in the length and width direction.

[0033] The second insulating member is assembled on the surface of the sheet body on the side opposite to the support member in the thickness direction, and the second insulating member is steppedly positioned relative to the recess.

[0034] A sealing element is filled in the cavity formed by assembling the first insulating element, the pole terminal, the second insulating element, and the top cover plate.

[0035] In the above technical solution, the insulating sealing assembly consists of two insulating components and one sealing component. The insulating sealing assembly wraps around the outer circumferential surface of the electrode terminal, serving to provide insulation and sealing. The top of the insulating sealing assembly is pressed into place by a support component, subjecting it to a pressing and limiting force in the thickness direction, further ensuring the sealing effect.

[0036] In some embodiments, a stepped portion is formed on the welding substrate, the stepped portion is embedded in the sink, and the stepped portion and the sink are separated by the insulating sealing component.

[0037] In the above technical solution, the stepped portion on the welding substrate serves to limit the movement step by step during assembly. The terminal post is first pressed onto the battery cell, and then the second insulating component is pressed onto it. The third insulating step of the second insulating component is circumferentially limited by the stepped portion of the welding substrate. Subsequently, the top cover is assembled, and the top cover is limited by the protruding ribs of the second insulating component. That is, each subsequent coaxial component is circumferentially limited by the previous component, which improves assembly accuracy and reduces assembly difficulty.

[0038] In some embodiments, the side of the pole terminal facing away from the support member in the thickness direction is formed with a recessed space.

[0039] In the above technical solution, the recessed space is designed primarily to save raw materials and reduce the product's weight. At the same time, the recessed space does not affect the welding connection between the electrode tab and the cover plate structure.

[0040] A second aspect of this application provides a battery having the aforementioned cover structure. The battery includes an electrode assembly with tabs on one side of the electrode assembly facing the cover structure in the thickness direction. The tabs are welded to the cover assembly.

[0041] In the above technical solutions, Battery The user experience is closely related to the battery. Improvements in the cover structure lead to improved battery performance.

[0042] In some embodiments, the electrode tab is directly welded to the welding substrate; the area of ​​the electrode tab in the length and width directions is larger than the area of ​​the welding substrate in the length and width directions; the dimension of the welding connection surface between the electrode tab and the welding substrate in the width direction is denoted as c. 焊接 The value range is 6mm≤c 焊接 ≤15mm.

[0043] In the above technical solutions, if the welded connection surface is too small, the effective channel for current flow becomes narrow, resulting in poor conductivity and a tendency to cause localized overheating. Furthermore, the welded connection strength is insufficient, posing a safety hazard. If the welded connection surface area is too large, it occupies too much internal space, leading to inefficient space utilization. This increases the difficulty of the welding process, requires higher precision, increases the probability of welding defects, and may cause thermal runaway risks due to an excessively large heat transfer area between the tab and the terminal. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the assembly state of the cover plate structure of this application.

[0045] Figure 2 This is a schematic diagram showing the assembled state of the cover plate structure of this application from another perspective.

[0046] Figure 3 This is an exploded view of the cover plate structure of this application.

[0047] Figure 4 This is an exploded view of the cover plate structure of this application from another perspective.

[0048] Figure 5 This is a top view of the battery structure of this application.

[0049] Figure 6 for Figure 5 AA sectional view.

[0050] Figure 7 for Figure 6 The enlarged view of section B is used to show the cross-sectional structure of the battery.

[0051] Figure 8 for Figure 7 The enlarged view of section C is used to illustrate the fit between the support, pole terminal, and insulation sealing assembly.

[0052] Figure 9 This is an exploded view of the battery electrode assembly and cover plate assembly of this application.

[0053] Figure 10 This is an exploded view of the battery electrode assembly and cover plate assembly from another perspective.

[0054] Figure 11 This is an assembly drawing of the battery electrode assembly and cover plate assembly of this application.

[0055] Figure label:

[0056] 1. Top cover plate;

[0057] 101. Mounting holes; 102. Sheet body; 103. Countersunk groove; 104. Rib;

[0058] 2. Terminal post; 201. Welding substrate; 202. First terminal boss; 203. Second terminal boss; 204. Riveting post; 205. Recessed space;

[0059] 2011, Stepped Section;

[0060] 3. Insulation and sealing components;

[0061] 301. First insulating component; 302. Second insulating component; 303. Sealing component;

[0062] 3011, First insulating step; 3012, Second insulating step; 3013, First through hole;

[0063] 3021, Insulating plate; 3022, Third insulating step; 3023, Second through hole; 3024, Fourth insulating step;

[0064] 4. Support components; 401. Support boss; 402. Support base plate; 403. Press-fit hole;

[0065] 5. Cavity;

[0066] 6. Pole group;

[0067] 7. Polar ears;

[0068] 8. Welded joint surfaces;

[0069] 9. Shell. Detailed Implementation

[0070] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0071] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0072] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0076] Example 1:

[0077] like Figure 1 and Figure 2 The diagram shown is a schematic representation of the cover plate assembly structure in this embodiment. (Refer to reference...) Figure 3 , Figure 4 The cover structure includes a top cover plate 1, which serves as the mounting reference.

[0078] In one embodiment of this application, a top cover 1 includes a sheet body 102, and two mounting holes 101 are symmetrically arranged at both ends of the sheet body 102, and each mounting hole 101 is fitted with a pole terminal 2.

[0079] Mounting hole 101 is configured as a through hole penetrating the sheet body 102. A rectangular groove is formed on the surface of the sheet body 102 on the side opposite to the support member 4 in the thickness direction. (Refer to reference) Figure 4 and Figure 8 The mounting hole 101 penetrates the bottom of the settling tank. On the surface of the sheet body 102 facing away from the settling tank in the thickness direction, a raised rib 104 is formed. The raised rib 104 surrounds and forms a rounded rectangle, which serves as the positioning base for other components.

[0080] A pole terminal 2 is inserted into the mounting hole 101. The structure of the pole terminal 2 is as follows: Figure 3 and Figure 4 As shown, it includes a welding substrate 201, which is subsequently used to weld to the tabs 7 on the battery cell.

[0081] To facilitate the positioning of other components of the cover plate structure to be installed later, a stepped portion 2011 is formed on the welding substrate 201 in this embodiment.

[0082] like Figure 3 , Figure 7 and Figure 8 As shown, a first terminal boss 202 is formed on the top surface of the stepped portion 2011 of the welding substrate 201, that is, on the surface of the stepped portion 2011 facing the support member 4 in the thickness direction. A second terminal boss 203 is formed on the top surface of the first terminal boss 202, that is, on the surface of the first terminal boss 202 facing the support member 4 in the thickness direction.

[0083] The diameter of the first terminal boss 202 is larger than the diameter of the second terminal boss 203. The first terminal boss 202 and the second terminal boss 203 are coaxial, so the area of ​​the first terminal boss 202 exceeding the area of ​​the second terminal boss 203 forms an annular surface. Riveting posts 204 are arranged in a circumferential array on this annular surface. In this embodiment, four, six, or eight riveting posts 204 can be used. To appropriately reduce operational complexity and production costs, four riveting posts 204 are preferred.

[0084] A second insulating component 302 is press-fitted onto the welding substrate 201 of the pole terminal 2.

[0085] The welding substrate 201 of the pole terminal 2 also adopts a rectangular plate. The second insulating member 302 includes an insulating plate body 3021, in Figure 3 On the lower surface of the insulating plate 3021 shown, that is, on the surface of the insulating plate 3021 facing away from the welding substrate 201 in the thickness direction, a fourth insulating step 3024 is formed. The fourth insulating step 3024 is formed by opening a rectangular groove on the surface of the second insulating member 302 facing the welding substrate 201 in the thickness direction. The welding substrate 201 is precisely embedded in the fourth insulating step 3024.

[0086] Insulating plate 3021 in Figure 3 On the upper surface of the insulating plate 3021, specifically on the side facing away from the welding substrate 201 in the thickness direction, a third insulating step 3022 is formed. The third insulating step 3022 is formed by providing a raised rectangular plate on the surface of the second insulating member 302 facing away from the welding substrate 201 in the thickness direction. The third insulating step 3022 is precisely embedded in the recess 103 of the top cover plate 1.

[0087] The fourth insulating step and the third insulating step 3022 can be formed by stamping or stretching. The insulating plate 3021 is stretched locally to make it protrude, resulting in a fourth insulating step 3024 that is concave on one side and a third insulating step 3022 that is convex on one side.

[0088] Top cover plate 1 in Figure 3 The first insulating member 301 is pressed onto the upper surface of the top cover sheet 1, that is, the surface of the sheet 102 of the top cover sheet 1 facing the support member 4 in the thickness direction.

[0089] The first insulating member 301 includes a first insulating step 3011 and a second insulating step 3012 located on the side of the first insulating step 3011 facing the support member 4 in the thickness direction. The first insulating step 3011 is press-fitted into the mounting hole 101 opening of the sheet body 102, and the first insulating step 3011 falls within the area enclosed by the protruding rib 104.

[0090] The second insulating step 3012 is pressed onto the rib 104, that is, the second insulating step 3012 is pressed onto the surface of the rib 104 on the side away from the sheet 102 in the thickness direction.

[0091] A first through hole 3013 is provided on the first insulating member 301, and a second through hole 3023 is provided on the second insulating member 302. Both the first through hole 3013 and the second through hole 3023 are used to accommodate the pole terminal 2 passing through.

[0092] The support member 4 is press-fitted onto the end face of the first insulating step 3011 and the pole terminal 2.

[0093] The support member 4 includes a support substrate 402, which is press-fitted onto the surface of the first insulating step 3011 on the side facing away from the sheet body 102 in the thickness direction. A support boss 401 is formed on the support substrate 402, and the support boss 401 is press-fitted onto the first terminal boss 202 of the pole terminal 2. A corresponding riveting hole 403 is formed on the support boss 401, and the riveting post 204 passes through the riveting hole 403 to realize the riveting connection between the support member 4 and the pole terminal 2.

[0094] The assembly between the first insulating component 301, the second insulating component 302, the top cover plate 1, the plate body 102, and the pole terminal 2 still retains, as shown in the figure. Figure 8 The cavity 5 is formed because the first insulating member 301 and the second insulating member 302 cannot completely fill the dimensional difference between the pole terminal 2 and the mounting hole 101. In this embodiment, a sealing member 303 is press-fitted into the cavity 5.

[0095] At this point, the support member 4 is completed by press-fitting and riveting. The support member 4 plays a press-fitting and limiting role on the insulating and sealing assembly 3 composed of the first insulating member 301, the sealing member 303, and the second insulating member 302, which is pressed by it, and press-fits the insulating and sealing assembly 3 with the top cover plate 1 and the pole terminal 2.

[0096] Example 2:

[0097] Support component 4 is made of steel, providing reliable support and limiting capability for the cover plate structure.

[0098] Example 3:

[0099] In this embodiment, the electrode terminal 2 is designed to save material. A recessed space 205 is provided on the side of the electrode terminal 2 away from the support member 4 in the thickness direction, which is used to reduce the material used in the electrode terminal 2 and the self-weight of the cover plate structure.

[0100] Since the shape of the pole terminal 2 is a non-standard multi-step structure, in order to ensure that the pole terminal 2 still has reliable strength and uniform wall thickness after the recessed space 205 is opened, the recessed space 205 is a shell-extraction space opened on the surface of the pole terminal 2 away from the support member 4 in the thickness direction.

[0101] Example 4:

[0102] This embodiment provides a battery that uses the cover plate structure described in the previous embodiment. For example... Figure 6 , Figure 9 and Figure 10 As shown, the battery has a cell, and the cell has a tab 7 on its surface facing the cover plate assembly in the thickness direction. The welded portion of the tab 7 is rectangular and is adapted to the shape of the welding substrate 201 of the terminal 2 and welded together.

[0103] The battery cell and cover structure, and the housing are assembled to obtain such a result. Figure 11 The finished battery shown.

[0104] Example 5:

[0105] like Figure 7 As shown, the tab 7 is welded to the welding substrate 201 in the width direction to form a welding connection surface. The dimension of the welding connection surface in the width direction is denoted as c. 焊接 The value range is 6mm≤c 焊接 ≤15mm.

[0106] If the width of the welded joint surface is set too small, the resistance will be higher. During battery charging and discharging, a large current flows through a small area, generating a large amount of heat and causing a sudden rise in local temperature. This leads to poor conductivity and accelerated aging, posing a safety hazard. An excessively small welded joint surface can also cause connection failure due to insufficient mechanical strength.

[0107] If the width dimension of the welding connection surface is set too large, it will occupy too much internal space and the probability of process defects will be higher. An excessively large welding area will also increase the heat conduction area between the tab 7 and the pole terminal 2, increasing the risk of thermal runaway.

[0108] Therefore, the range of weld joint surface dimensions proposed in this embodiment is quite suitable.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cover plate structure, comprising a top cover sheet, wherein the top cover sheet defines a length direction, a width direction, and a thickness direction. Its features are: The top cover plate is provided with mounting holes, and each mounting hole is provided with: The pole terminal passes through the mounting hole on the top cover plate. An insulating and sealing assembly is coaxially sleeved on the outer wall surface of the electrode terminal. A support member is press-fitted onto the electrode terminal, and the support member and the electrode terminal clamp and limit the top cover plate in the thickness direction; the support member and the electrode terminal are connected by multi-point press riveting. The pole terminal includes: Welding substrate, The first terminal boss is formed on the side of the welding substrate facing the support member in the thickness direction. The second terminal boss is formed on the side of the first terminal boss facing the support member in the thickness direction. A plurality of rivet posts are provided; the rivet posts are located on the surface of the first terminal boss facing the support member in the thickness direction, and the rivet posts penetrate the support member and are press-fitted to the support member. The riveting posts are arranged in a circular array centered on the second terminal boss. The support member includes: A support boss is press-fitted onto the surface of the first terminal boss that is away from the top cover plate in the thickness direction; the riveting post is press-fitted onto the support boss on the surface of the support boss that is away from the top cover plate in the thickness direction. A support substrate, wherein the support boss is formed on the surface of the support substrate facing away from the top cover sheet in the thickness direction; the support substrate is press-fitted into the insulating sealing assembly on the side facing away from the top cover sheet in the thickness direction.

2. The cover plate structure as described in claim 1, characterized in that: The top cover plate includes: The mounting holes penetrate the sheet body. A recessed groove is formed on the surface of the mounting hole on the side opposite to the support member in the thickness direction, and the mounting hole penetrates the bottom of the recessed groove. Ribs are formed on the surface of the sheet body facing the support member in the thickness direction, and the ribs form a closed contour.

3. The cover plate structure as described in claim 2, characterized in that: The insulating and sealing assembly includes: The first insulating element is assembled on the surface of the sheet body facing the support member in the thickness direction, and is located inside the closed contour formed by the rib in the length and width direction. The second insulating member is assembled on the surface of the sheet body on the side opposite to the support member in the thickness direction, and the second insulating member is steppedly positioned relative to the recess. A sealing element is filled in the cavity formed by assembling the first insulating element, the pole terminal, the second insulating element, and the top cover plate.

4. The cover plate structure as described in claim 3, characterized in that: The welding substrate has a stepped portion formed thereon, the stepped portion is embedded in the sink, and the stepped portion and the sink are separated by the insulating sealing component.

5. The cover plate structure as described in claim 1, characterized in that: The side of the pole terminal facing away from the support member in the thickness direction is formed with a recessed space.

6. A battery having a cover plate structure as described in any one of claims 1-5, characterized in that: The device includes an electrode assembly, wherein the electrode assembly has an electrode lug on the side facing the cover plate structure in the thickness direction, and the electrode lug is welded to the cover plate assembly.

7. The battery as described in claim 6, characterized in that: The electrode tab is directly welded to the welding substrate; the area of ​​the electrode tab in the length and width directions is larger than the area of ​​the welding substrate in the length and width directions; the dimension of the welding connection surface between the electrode tab and the welding substrate in the width direction is denoted as c. 焊接 The value range is 6mm≤c 焊接 ≤15mm.

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