Connecting sheet, cover plate assembly and battery

Abstract

The utility model relates to battery technical field discloses connecting piece, cover plate subassembly and battery, include: piece main part has the first surface and the second surface who sets up opposite interval along its thickness direction, piece main part is opened with through -hole along the thickness direction, the through -hole is suitable for inserting the pole, the part of piece main part around through -hole forms the seam weld joint part, penetrates the welding part, sets up opposite along the thickness direction with through -hole, the opposite two sides of penetrates the welding part along the thickness direction forms the pole lamination face and the welding use face respectively, the connecting part connects piece main part and penetrates the welding part, the utility model discloses utilize the seam weld joint part that piece main part around through -hole formed and the pole carry out seam weld connection, utilize penetrates the welding part and the pole carry out penetration weld connection, therefore, can make connecting piece through seam weld + penetration weld mode and the pole carry out connection, reduce the risk of virtual welding of connecting piece and the pole, and can increase the welding area of connecting piece and the pole, improve the overcurrent capacity between connecting piece and the pole.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a connecting piece, a cover plate assembly, and a battery. Background Technology

[0002] With the rapid development of new energy vehicles, consumer electronics, and energy storage systems, the demand for battery cells, as a key component, is experiencing explosive growth, and the industry is developing rapidly. Technological innovation has become the core driving force for competition in battery cells. Improving energy density, extending cycle life, enhancing safety, achieving fast charging, and meeting green and environmental protection requirements have become the main development directions for battery cell technology. The connecting tabs in a battery cell play a role in conducting electrical energy from the electrode assembly to the terminal. During the assembly process, the connecting tabs, terminal, and electrode tabs of the electrode assembly need to be welded together. In existing technologies, through-welding is typically used to weld the connecting tabs and terminal, which is prone to producing incomplete welds and affecting the current-carrying capacity between the connecting tabs and terminal. Utility Model Content

[0003] This invention provides a connecting piece, a cover plate assembly, and a battery to solve the problem in the prior art where the connecting piece and the terminal post are usually welded using a through-welding method, which easily leads to incomplete welding and affects the current carrying capacity between the connecting piece and the terminal post.

[0004] In a first aspect, this utility model provides a connecting piece, comprising: The sheet body has a first surface and a second surface that are spaced apart from each other along its thickness direction. The sheet body has a through hole along the thickness direction, the through hole being adapted to insert an electrode post. The portion of the sheet body surrounding the through hole forms a seam welded part. The penetrating welding part is disposed opposite to the through hole along the thickness direction, and the two opposite sides of the penetrating welding part along the thickness direction respectively form the pole post bonding surface and the welding application surface; The connecting part connects the sheet body and the through-welding part.

[0005] In one alternative embodiment, the through-welding portion passes through the through hole along the thickness direction, and the pole contact surface extends out of the first surface.

[0006] In one optional embodiment, the connecting portion includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The end of the first connecting segment away from the second connecting segment is connected to the welding surface and is disposed near the edge of the welding surface. The second connecting segment is located on the side near the second surface. The end of the third connecting segment away from the second connecting segment is connected to the outer peripheral edge of the sheet body or to the edge of the sheet body near the through hole.

[0007] In one alternative embodiment, along the thickness direction, the through-weld portion is located outside the through hole, and the pole contact surface is arranged parallel to the second surface.

[0008] In one alternative embodiment, the connecting portion is connected to the second surface and connected to the outer peripheral surface of the through-welded portion.

[0009] In one alternative embodiment, the second surface is formed with a tab welding area, and the connecting portion is spaced apart from the tab welding area.

[0010] Secondly, this utility model also provides a cover plate assembly, comprising: The cover plate body has a through-hole for pole posts along the thickness direction; The electrode post is inserted through the electrode post hole; In the aforementioned connecting piece, the first surface faces the cover plate body, the first end of the pole is inserted into the through hole and parallel to the second surface, the seam weld portion is attached to the outer peripheral surface of the pole near the first end through the hole wall of the through hole, the seam weld portion is welded to the pole to form a seam weld mark, the pole contact surface is attached to the end face of the pole near the first end, and the through weld portion is welded to the pole to form a through weld mark.

[0011] In one optional embodiment, the pole includes a pole body and a support leg. The support leg is connected to the outer peripheral surface of the pole body near the first end and extends in a direction away from the pole body. At least a portion of the support leg is inserted into the through hole, and the seam weld portion is welded to the support leg to form the seam weld mark.

[0012] In one optional embodiment, a groove is formed at the first end of the column body along the thickness direction, the through-welding portion extends into the groove, and the bottom wall of the groove is disposed opposite to and fitted to the electrode post contact surface along the thickness direction; or... The electrode contact surface is positioned opposite to and connected to the end face of the support leg located at the first end along the thickness direction.

[0013] Thirdly, this utility model also provides a battery, comprising: The housing has an opening at at least one end; The aforementioned cover assembly is connected to the housing and seals the opening, and the housing and the cover assembly together form an accommodating space; The battery cell is disposed in the receiving space and electrically connected to the cover plate assembly.

[0014] The technical solution of this application has the following advantages: 1. By using the connecting piece of this application, the connecting piece is connected to the pole by seam welding of the seam welded part formed around the through hole, and to the pole by through welding of the through welded part. Therefore, the connecting piece can be connected to the pole by seam welding + through welding, which reduces the risk of poor welding between the connecting piece and the pole, and increases the welding area between the connecting piece and the pole, thereby improving the current carrying capacity between the connecting piece and the pole.

[0015] 2. By using the cover plate assembly of this application, the portion of the electrode post located at the first end is inserted into the through hole, which can reduce the distance between the first surface of the connecting piece and the cover plate body, allowing the connecting piece to fully occupy the thickness space of the cover plate body, saving the space occupied by the cover plate assembly, providing more space for the battery cell, and improving the volumetric energy density of the battery.

[0016] 3. The battery using this embodiment can accommodate larger cells within the same external dimensions, thereby increasing the volumetric energy density of the battery. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first connecting piece according to an embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram of the connecting piece from another angle is shown; Figure 3 for Figure 1 The front view of the connecting piece is shown; Figure 4 for Figure 1 The bottom view of the connecting piece shown; Figure 5 This is a schematic diagram of the structure of the second type of connecting piece according to an embodiment of the present utility model; Figure 6 for Figure 5 A schematic diagram of the connecting piece from another angle is shown; Figure 7 for Figure 5 The front view of the connecting piece is shown; Figure 8 for Figure 5 The bottom view of the connecting piece shown; Figure 9 This is a schematic diagram of the structure of the third type of connecting piece according to an embodiment of the present utility model; Figure 10 for Figure 9 A schematic diagram of the connecting piece from another angle is shown; Figure 11 for Figure 9 The front view of the connecting piece is shown; Figure 12 for Figure 9 The bottom view of the connecting piece shown; Figure 13 This is a schematic diagram of the structure of the cover plate assembly using the first type of connecting piece according to an embodiment of the present utility model; Figure 14 for Figure 13 The bottom view of the cover plate assembly shown; Figure 15 for Figure 14 A cross-sectional view along the AA direction; Figure 16 for Figure 15 A magnified view of a portion of point B in the middle; Figure 17 This is a schematic diagram of the cover plate assembly using the second type of connecting piece according to an embodiment of the present utility model; Figure 18 for Figure 17 The bottom view of the cover plate assembly shown; Figure 19 for Figure 18 A cross-sectional view along the CC direction; Figure 20 for Figure 19 A magnified view of a portion of point D in the middle; Figure 21 This is a schematic diagram of the cover plate assembly using the third type of connecting piece according to an embodiment of the present utility model; Figure 22 for Figure 21 The bottom view of the cover plate assembly shown; Figure 23 for Figure 22 Cross-sectional view along the EE direction; Figure 24 for Figure 23 A magnified view of a portion of point F in the middle.

[0019] Explanation of reference numerals in the attached figures: 1. Body of the sheet; 11. First surface; 12. Second surface; 121. Electrode welding area; 13. Through hole; 14. Seam weld; 2. Penetrating weld; 21. Electrode mating surface; 22. Welding application surface; 3. Connecting part; 31. First connecting section; 32. Second connecting section; 33. Third connecting section; 10. Connecting piece; 20. Cover plate body; 210. Pole post hole; 30. Pole post; 310. Post body; 311. Groove portion; 312. Groove bottom wall; 313. First post section; 314. Second post section; 315. Stepped surface; 320. Support leg; 40. Seam weld mark; 50. Penetration weld mark; 60. Pressure block; 70. Seam seal; 80. Upper insulating component; 90. Lower insulating component; 100. Cover plate assembly. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined Figures 1 to 24 The following describes embodiments of the present invention.

[0022] According to embodiments of the present invention, on the one hand, such as Figures 1 to 12 As shown, a connecting piece 10 is provided, including: a piece body 1 having a first surface 11 and a second surface 12 that are spaced apart from each other along its thickness direction; a through hole 13 is provided in the piece body 1 along its thickness direction, the through hole 13 being suitable for inserting an electrode post 30; a seam welded portion 14 is formed around the through hole 13 in the part of the piece body 1; a through welded portion 2, which is disposed opposite to the through hole 13 along its thickness direction; the two opposite surfaces of the through welded portion 2 along its thickness direction respectively form an electrode post contact surface 21 and a welding application surface 22; and a connecting portion 3 connecting the piece body 1 and the through welded portion 2.

[0023] Using the connecting piece 10 of this embodiment, the connecting piece 10 is connected to the pole post 30 by seam welding of the seam welding part 14 formed around the through hole 13 by the main body 1, and by through welding of the pole post 30 by through welding of the through welding part 2. Therefore, the connecting piece 10 can be connected to the pole post 30 by seam welding and through welding, which reduces the risk of poor welding between the connecting piece 10 and the pole post 30, and increases the welding area between the connecting piece 10 and the pole post 30, thereby improving the current carrying capacity between the connecting piece 10 and the pole post 30.

[0024] It is worth noting that in related technologies, the connecting piece 10 is typically a single, complete piece, i.e., without through holes 13. One surface of the connecting piece 10 along its thickness direction is attached to the end face of the electrode post 30, and through-welding is performed on the other side of the connecting piece 10 along its thickness direction to weld the connecting piece 10 and the electrode post 30 together. However, through-welding is prone to incomplete welds, and requires high welding power and energy.

[0025] In this embodiment, firstly, the main body 1 and the pole post 30 are connected by seam welding to reduce the risk of incomplete welding and ensure the current carrying capacity between the connecting piece 10 and the pole post 30. Secondly, the welding between the through welding part 2 and the pole post 30 is increased by through welding to further increase the welding area between the connecting piece 10 and the pole post 30, improve the connection effect between the connecting piece 10 and the pole post 30, reduce the impedance between the connecting piece 10 and the pole post 30, and improve the current carrying capacity between the connecting piece 10 and the pole post 30.

[0026] It is worth noting that seam welding refers to a welding method in which two workpieces are assembled into a lap or butt joint and welded at the joint. Penetration welding refers to a welding method in which two workpieces are assembled in a stacked manner, allowing laser energy to penetrate one workpiece and fuse with the other.

[0027] The following describes various specific embodiments of the connecting piece 10.

[0028] In the first embodiment, such as Figures 1 to 4 As shown, along the thickness direction, the through-welding part 2 passes through the through hole 13, and the pole post mating surface 21 extends out of the first surface 11.

[0029] Furthermore, in the first embodiment, as Figure 1 As shown, the connecting part 3 includes a first connecting segment 31, a second connecting segment 32 and a third connecting segment 33 connected in sequence. The end of the first connecting segment 31 away from the second connecting segment 32 is connected to the welding surface 22 and is located near the edge of the welding surface 22. The second connecting segment 32 is located on the side near the second surface 12. The end of the third connecting segment 33 away from the second connecting segment 32 is connected to the outer peripheral edge of the sheet body 1.

[0030] In the second embodiment, as Figures 5 to 8 As shown, along the thickness direction, the through-welding part 2 passes through the through hole 13, and the pole post mating surface 21 extends out of the first surface 11.

[0031] Furthermore, in the second embodiment, as Figure 5As shown, the connecting part 3 includes a first connecting segment 31, a second connecting segment 32 and a third connecting segment 33 connected in sequence. The end of the first connecting segment 31 away from the second connecting segment 32 is connected to the welding surface 22 and is located near the edge of the welding surface 22. The second connecting segment 32 is located on the side near the second surface 12. The end of the third connecting segment 33 away from the second connecting segment 32 is connected to the edge of the sheet body 1 near the through hole 13.

[0032] It is worth noting that, please refer to Figures 13 to 20 When using the connecting piece 10 in the first and second embodiments, the end face of the pole post 30 used for welding with the penetrating welding part 2 is recessed along the thickness direction to form a groove 311. The penetrating welding part 2 extends into the groove 311, and the bottom wall 312 of the groove 311 is disposed opposite to and fitted to the pole post contact surface 21 along the thickness direction. At this time, the second connecting segment 32 is located outside the groove 311, and the end of the third connecting segment 33 used for connecting with the second connecting segment 32 is located outside the groove 311. The end of the third connecting segment 33 away from the second connecting segment 32 extends into the groove 311 to connect with the welding surface 22.

[0033] Specifically, in the first and second embodiments, such as Figures 1 to 8 As shown, the penetrating weld portion 2 is sheet-shaped, and furthermore, the shape of the penetrating weld portion 2 is adapted to the shape of the pole post 30. For example, when the pole post 30 is cylindrical, the penetrating weld portion 2 is circular; when the pole post 30 is square, the penetrating weld portion 2 is square.

[0034] It should be noted that you should refer to [link / reference]. Figure 16 and Figure 20 The outer periphery of the through-welding part 2 should be slightly smaller than the opening range of the groove 311. This setting facilitates the insertion of the through-welding part 2 into the groove 311 and increases the contact area between the electrode contact surface 21 and the bottom wall 312 of the groove, thus providing sufficient welding area for the through-welding stamp 50, ensuring the welding effect between the through-welding part 2 and the electrode 30, and improving the current flow capacity of the connecting piece 10 and the electrode 30.

[0035] It is worth noting that, compared with the connecting piece 10 of the first embodiment, the connecting piece 10 of the second embodiment has a shorter current conduction path, lower resistance, less heat generation, lighter weight, and higher raw material utilization.

[0036] In the third embodiment, as Figures 9 to 12 As shown, along the thickness direction, the through-welding part 2 is located outside the through hole 13, and the pole post mating surface 21 is arranged parallel to the second surface 12.

[0037] Furthermore, in the third embodiment, as Figure 9As shown, the connecting part 3 is connected to the second surface 12 and connected to the outer peripheral surface of the penetrating welding part 2.

[0038] It is worth noting that, please refer to Figures 21 to 24 When using the connecting piece 10 in the third embodiment, the through-welding part 2 is directly bonded to the end face of the pole post 30 at the first end (that is, the through-welding part 2 does not need to extend into the groove part 311). Specifically, the pole post 30 includes a pole body 310 and a support leg 320. The support leg 320 is connected to the outer peripheral surface of the pole body 310 near the first end (the end for connecting with the connecting piece 10) and extends in a direction away from the pole body 310. At least a portion of the support leg 320 is inserted into the through hole 13. The seam weld 14 is welded to the support leg 320 to form a seam weld mark 40. The pole post contact surface 21 is disposed opposite to and bonded to the end face of the support leg 320 at the first end along the thickness direction.

[0039] Furthermore, in the third embodiment, as Figures 9 to 12 As shown, the penetrating weld portion 2 is annular, and furthermore, the shape of the penetrating weld portion 2 is adapted to the shape of the pole post 30. For example, when the pole post 30 is cylindrical, the penetrating weld portion 2 is annular; when the pole post 30 is square, the penetrating weld portion 2 is square annular.

[0040] Further explanation is needed; please refer to [link / reference]. Figure 24 The width of the annular through-welding part 2 should be approximately the same as the width of the support leg 320. This can avoid interference with other components and increase the contact area between the pole contact surface 21 and the support leg 320, so as to provide sufficient welding area for the through-welding stamp 50, ensure the welding effect between the through-welding part 2 and the pole 30, and improve the current carrying capacity of the connecting piece 10 and the pole 30.

[0041] In one embodiment, such as Figure 1 , Figure 5 and Figure 9 As shown, the second surface 12 has a tab welding area 121, and the connecting part 3 is spaced apart from the tab welding area 121. This arrangement avoids interference between the connecting part 3 and the tab.

[0042] It is worth noting that the tabs of the battery cell are welded to the tab welding area 121. Furthermore, along the thickness direction, the space occupied by the protruding portion of the connecting part 3 relative to the second surface 12 makes full use of the thickness space occupied by the tab, avoiding the connecting part 3 occupying additional space and ensuring the volumetric energy density of the battery.

[0043] According to an embodiment of the present invention, on the other hand, as... Figures 13 to 24As shown, a cover plate assembly 100 is also provided, including: a cover plate body 20, with a through-hole 210 along the thickness direction; a pole 30, which passes through the pole hole 210; the connecting piece 10 mentioned above, with its first surface 11 facing the cover plate body 20; the first end of the pole 30 is inserted into the through hole 13 and parallel to the second surface 12; the seam weld 14 is attached to the outer peripheral surface of the pole 30 near the first end through the hole wall of the through hole 13; the seam weld 14 is welded to the pole 30 to form a seam weld mark 40; the pole contact surface 21 is attached to the end face of the pole 30 near the first end; and the through weld 2 is welded to the pole 30 to form a through weld mark 50.

[0044] By using the cover plate assembly 100 of this embodiment, the portion of the electrode post 30 located at the first end is inserted into the through hole 13, which can reduce the distance between the first surface 11 of the connecting piece 10 and the cover plate body 20, allowing the connecting piece 10 to fully occupy the thickness space of the cover plate body 20, saving the space occupied by the cover plate assembly 100, providing more space for the battery cell, and improving the volumetric energy density of the battery.

[0045] It is worth noting that in related technologies, one surface of the connecting piece 10 along the thickness direction is attached to the end face of the electrode post 30, and penetration welding is performed on the other side of the connecting piece 10 along the thickness direction to weld the connecting piece 10 and the electrode post 30 together. Therefore, in the thickness direction, the distance between the side of the connecting piece 10 facing the cover plate body 20 and the cover plate body 20 is relatively large, resulting in the cover plate assembly 100 occupying a large space along the thickness direction, compressing the space for the battery cell and affecting the volumetric energy density of the battery.

[0046] In this embodiment, the electrode post 30 and the connecting piece 10 partially overlap in the thickness direction, which reduces the space occupied by the cover plate assembly 100 in the thickness space, increases the space for the battery cell, and improves the volumetric energy density of the battery.

[0047] In one embodiment, such as Figure 4 As shown, the pole post 30 includes a pole body 310 and a support leg 320. The support leg 320 is connected to the outer peripheral surface of the pole body 310 near the first end and extends in a direction away from the pole body 310. At least a portion of the support leg 320 is inserted into the through hole 13. The seam welded part 14 is welded to the support leg 320 to form a seam weld mark 40.

[0048] It is worth noting that, in order to ensure the welding quality of the seam weld mark 40, the end face of the support leg 320 at the first end is flush or nearly flush with the second surface 12 in the thickness direction.

[0049] Furthermore, such as Figure 16 , Figure 20 and Figure 24As shown, the column body 310 includes a first column segment 313 and a second column segment 314 connected along the thickness direction. The outer periphery of the second column segment 314 extends beyond the outer periphery of the first column segment 313, so that the connection between the first column segment 313 and the second column segment 314 forms a stepped surface 315. A support leg 320 is connected to the outer periphery of the second column segment 314. The cover plate assembly 100 also includes a pressure block 60, which is connected to the first column segment 313 and pressed against the stepped surface 315. The cover plate body 20 is sandwiched between the pressure block 60 and the support leg 320. Therefore, by providing the support leg 320, it can both cooperate with the pressure block 60 to fasten the cover plate body 20 and achieve current diversion, fully utilizing the function of the conductive component.

[0050] It is worth noting that, such as Figure 16 , Figure 20 and Figure 24 As shown, the cover plate assembly 100 also includes a seal 70, which is disposed around the second post segment 314 and located on the support leg 320, such that the seal 70 is compressed between the cover plate body 20 and the pole post 30. The cover plate assembly 100 also includes an upper insulator 80, which is disposed between the cover plate body 20 and the pole post 30, and between the cover plate body 20 and the pressure block 60. The cover plate assembly 100 also includes a lower insulator 90, which is disposed between the cover plate body 20 and the support leg 320.

[0051] In one embodiment, such as Figure 16 , Figure 20 and Figure 24 As shown, a groove 311 is formed at the first end of the post body 310 along the thickness direction. This configuration can reduce the weight of the post 30, thereby increasing the gravimetric energy density of the battery, and can also reduce the impedance of the post 30 to reduce battery heat generation.

[0052] Furthermore, in one embodiment, such as Figure 16 and Figure 20 As shown, the penetrating welding part 2 extends into the groove part 311, and the bottom wall 312 of the groove part 311 is disposed opposite to and attached to the electrode post contact surface 21 along the thickness direction. At this time, the connecting piece 10 is the connecting piece 10 of the first embodiment or the second embodiment described above.

[0053] Additionally, in another embodiment, such as Figure 24 As shown, the electrode contact surface 21 is disposed opposite to and connected to the end face of the support leg 320 at the first end along the thickness direction. At this time, the connecting piece 10 is the connecting piece 10 of the third embodiment described above.

[0054] According to an embodiment of the present invention, in another aspect, a battery is also provided, comprising: a housing having an opening at at least one end; a cover assembly 100 connected to the housing and sealing the opening, the housing and the cover assembly 100 forming an accommodating space; and a battery cell disposed in the accommodating space and electrically connected to the cover assembly 100.

[0055] The battery using this embodiment can accommodate larger cells within the same external dimensions, thereby increasing the battery's volumetric energy density.

[0056] It is worth noting that the battery in this embodiment can meet the requirements of high volumetric energy density, high gravimetric energy density, low heat generation, and the ability to store and output more electricity.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A connecting piece, characterized in that, include: The sheet body (1) has a first surface (11) and a second surface (12) that are spaced apart from each other along its thickness direction. The sheet body (1) has a through hole (13) along the thickness direction. The through hole (13) is suitable for inserting an electrode post (30). The portion of the sheet body (1) surrounding the through hole (13) forms a seam welded part (14). The through-welding part (2) is arranged opposite to the through hole (13) along the thickness direction. The two opposite sides of the through-welding part (2) along the thickness direction respectively form a pole post contact surface (21) and a welding application surface (22). The connecting part (3) connects the sheet body (1) and the through-welding part (2).

2. The connecting piece according to claim 1, characterized in that, Along the thickness direction, the through weld (2) passes through the through hole (13), and the pole contact surface (21) extends out of the first surface (11).

3. The connecting piece according to claim 2, characterized in that, The connecting part (3) includes a first connecting segment (31), a second connecting segment (32) and a third connecting segment (33) connected in sequence. The end of the first connecting segment (31) away from the second connecting segment (32) is connected to the welding surface (22) and is located near the edge of the welding surface (22). The second connecting segment (32) is located on the side near the second surface (12). The end of the third connecting segment (33) away from the second connecting segment (32) is connected to the outer peripheral edge of the sheet body (1) or to the edge of the sheet body (1) near the through hole (13).

4. The connecting piece according to claim 1, characterized in that, Along the thickness direction, the through weld (2) is located outside the through hole (13), and the pole contact surface (21) is arranged parallel to the second surface (12).

5. The connecting piece according to claim 4, characterized in that, The connecting part (3) is connected to the second surface (12) and to the outer peripheral surface of the through weld part (2).

6. The connecting piece according to any one of claims 1 to 5, characterized in that, The second surface (12) has a tab welding area (121) formed thereon, and the connecting part (3) is spaced apart from the tab welding area (121).

7. A cover plate assembly, characterized in that, include: The cover plate body (20) has a through-hole (210) along the thickness direction. The pole post (30) is inserted through the pole post hole (210); The connecting piece (10) according to any one of claims 1 to 6, wherein the first surface (11) is disposed facing the cover plate body (20), the first end of the pole (30) is inserted into the through hole (13) and is parallel to the second surface (12), the seam weld (14) is attached to the outer peripheral surface of the pole (30) near the first end through the hole wall of the through hole (13), the seam weld (14) is welded to the pole (30) to form a seam weld mark (40), the pole contact surface (21) is attached to the end face of the pole (30) near the first end, and the through weld (2) is welded to the pole (30) to form a through weld mark (50).

8. The cover plate assembly according to claim 7, characterized in that, The pole post (30) includes a pole body (310) and a support leg (320). The support leg (320) is connected to the outer peripheral surface of the pole body (310) near the first end and extends in a direction away from the pole body (310). At least a portion of the support leg (320) is inserted into the through hole (13). The seam weld (14) is welded to the support leg (320) to form the seam weld mark (40).

9. The cover plate assembly according to claim 8, characterized in that, The first end of the column body (310) is recessed along the thickness direction to form a groove (311), the through weld (2) extends into the groove (311), and the bottom wall (312) of the groove (311) is disposed opposite to and fitted to the pole post contact surface (21) along the thickness direction; or, The pole contact surface (21) is disposed opposite to and in contact with the end face of the support leg (320) located at the first end along the thickness direction.

10. A battery, characterized in that, include: The housing has an opening at at least one end; The cover plate assembly (100) according to any one of claims 7 to 9 is connected to the housing and seals the opening, wherein the housing and the cover plate assembly (100) enclose a receiving space; The battery cell is disposed in the receiving space and electrically connected to the cover plate assembly (100).

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