Terminal, cover plate assembly and battery monomer

Abstract

The utility model provides a terminal, a cover plate assembly and a battery monomer, and relates to the technical field of batteries. The terminal is applied to a single battery and comprises a pressing block, a groove is formed in one side of the pressing block, a through hole is formed in the other side of the pressing block, and the through hole is communicated with the groove; wherein the through holes are configured to allow the current collecting pieces of the battery monomers to penetrate into the grooves, and the inner walls of the grooves are configured to be electrically connected with the current collecting pieces of the battery monomers. According to the application, the groove and the through hole which are matched with the current collecting piece are formed in the pressing block, so that one end of the current collecting piece can penetrate through the through hole and then is positioned in the groove, metal chips generated by welding of the terminal and the current collecting piece can be positioned in the groove, and further the metal chips generated during welding can be effectively prevented from falling into the single battery. Therefore, the short-circuit probability of the battery monomers can be reduced, and the reliability of the battery monomers is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a terminal, a cover plate assembly and a battery cell. Background Art

[0002] In related technologies, a battery cell consists of a housing, an electrode assembly and current collector disposed within the housing, a cover plate that closes the housing opening to define a housing cavity, and terminals that penetrate the cover plate. The terminals are welded to the current collector at their ends facing the electrode assembly. This welding of the terminals to the current collector can easily generate metal shavings, which can fall into the housing and cause short circuits within the battery cell, reducing its reliability. Utility Model Content

[0003] The present application provides a terminal, a cover plate assembly and a battery cell, which can improve the reliability of the battery cell.

[0004] In a first aspect, the present application provides a terminal, which is applied to a battery cell. The terminal includes a pressing block, a groove is provided on one side of the pressing block, and a through hole is provided on the other side, and the through hole is connected to the groove; wherein the through hole is configured to allow a current collecting part of the battery cell to penetrate into the groove, and the inner wall of the groove is configured to be electrically connected to the current collecting part of the battery cell.

[0005] In one embodiment, the terminal further comprises a sealing plate, which is connected to the pressing block and closes the notch of the groove to define a connection cavity; wherein the connection cavity is configured for burying the current collecting member therein, and the cavity wall of the connection cavity is configured to be electrically connected to the current collecting member of the battery cell.

[0006] In one embodiment, a first step is provided on a side of the groove wall close to the groove opening. The first step extends in a ring shape around the groove opening. The edge of the sealing plate overlaps the first step.

[0007] In one embodiment, the distance between the inner circumference and the outer circumference of the first step is W1, which satisfies: 0.1 mm ≤ W1 ≤ 0.5 mm.

[0008] In one embodiment, a side of the sealing plate facing away from the through hole is coplanar with a side of the pressing block facing away from the through hole.

[0009] In one embodiment, the area of ​​the terminal surface facing away from the through hole is 50 mm 2 ~300mm 2 .

[0010] In one embodiment, the thickness of the sealing plate is D1, which satisfies: 1 mm ≤ D1 ≤ 2.5 mm.

[0011] In one embodiment, the material of the compression block is configured to be consistent with the material of the current collecting member connected thereto, and the sealing plate is an aluminum plate.

[0012] In one embodiment, the outer surface of the pressing block provided with the through hole is the first surface, and the distance between the first surface and the bottom of the groove is D2, which satisfies: 1 mm ≤ D2 ≤ 3 mm.

[0013] In one embodiment, the pressing block has a peripheral side wall forming a groove wall of the groove, and the thickness of the peripheral side wall is D3, which satisfies: 1mm≤D3≤3mm.

[0014] In one embodiment, the through hole is a strip-shaped hole, the longest diameter of the strip-shaped hole is L, and satisfies: 15 mm ≤ L ≤ 25 mm.

[0015] In the second aspect, the present application provides a cover plate assembly, which includes a sealing ring, a cover plate, an upper plastic part, a lower plastic part, a current collecting part and the aforementioned terminal; the cover plate is provided with a mounting hole; the terminal is provided on one side of the cover plate, and the groove is provided away from the cover plate; the upper plastic part is located between the cover plate and the terminal, and the two sides of the upper plastic part are respectively connected to the cover plate and the terminal; the lower plastic part is connected to the other side of the cover plate; one end of the current collecting part passes through the mounting hole and the through hole and is connected to the terminal; the sealing ring seals the mating part between the mounting hole and the current collecting part.

[0016] In one embodiment, a connection groove is provided on one side of the terminal close to the cover plate, and a connection block is provided on the side of the upper plastic part facing the terminal. The connection block cooperates with the connection groove and is connected to the inner wall of the connection groove.

[0017] In a third aspect, the present application provides a battery cell, which includes a shell, an electrode assembly and the aforementioned cover plate assembly; the electrode assembly is disposed in the shell; the cover plate covers the shell; and the current collector is connected to the electrode assembly.

[0018] Beneficial effects of this application:

[0019] In this application, by providing a groove and a through-hole on the pressing block that match the current collector, one end of the current collector can pass through the through-hole and be located in the groove. This allows the metal shavings generated by welding the terminal and the current collector to be located in the groove, effectively preventing the metal shavings generated during welding from falling into the battery cell. This can reduce the probability of battery cell short circuits and improve battery cell reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

[0022] Figure 2 It is along Figure 1 Cross-sectional view of AA;

[0023] Figure 3 Schematic diagram of welding of terminals and current collectors provided in an embodiment of the present application;

[0024] Figure 4 is a structural diagram of another terminal provided in an embodiment of the present application;

[0025] Figure 5 yes Figure 4 Cross-sectional view of the middle BB;

[0026] Figure 6 Schematic diagram of the structure of the compact provided in the embodiment of the present application;

[0027] Figure 7 yes Figure 6 Cross-sectional view of CC;

[0028] Figure 8 is a structural schematic diagram of a cover plate assembly provided in an embodiment of the present application;

[0029] Figure 9 yes Figure 8 Enlarged view of point D in the middle;

[0030] Figure 10 is a schematic structural diagram of a terminal from another perspective provided by an embodiment of the present application;

[0031] Figure 11 Schematic diagram of the structure of the upper plastic part provided in an embodiment of the present application;

[0032] Figure 12 It is a schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 001-terminal;

[0035] 011-pressing block; 111-groove; 112-through hole; 113-first step; 114-first surface; 115-side wall; 116-connecting groove;

[0036] 012-sealing plate;

[0037] 002-cover assembly;

[0038] 021-sealing ring; 022-cover plate; 221-mounting hole; 023-upper plastic part; 231-connecting block; 024-lower plastic part; 025-current collecting part;

[0039] 003-battery cell; 031-shell. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] The terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0043] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.

[0044] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the terminal 001 provided in an embodiment of the present application. Figure 2 It is along Figure 1Cross-sectional view of AA in FIG. In the first aspect, an embodiment of the present application provides a terminal 001, which is applied to a battery cell. The terminal 001 includes a pressing block 011. A groove 111 is provided on one side of the pressing block 011, and a through hole 112 is provided on the other side. The through hole 112 is connected to the groove 111. The through hole 112 is configured to allow the current collecting part of the battery cell to penetrate into the groove 111. The inner wall of the groove 111 is configured to be electrically connected to the current collecting part of the battery cell.

[0045] It can be understood that the pressing block 011 is a metal piece, which can be made of copper, aluminum, or a copper-aluminum composite material.

[0046] It can be understood that the current collecting member may be a current collecting disk or other conductive member.

[0047] Furthermore, when terminal 001 is used in a battery cell, it can be installed in the top cover of the battery cell or on the side of the top cover facing away from the electrode assembly. The corresponding portion of the top cover needs to be sealed. Furthermore, when terminal 001 is at least partially located outside the battery cell, the notch of recess 111 can also be sealed to improve the sealing of the battery cell using terminal 001.

[0048] It can be understood that when the terminal 001 is welded to the current collector, one end of the current collector passes through the through hole 112 and is located in the groove 111, and contacts the inner wall of the groove 111. Then, the welding head of the welding equipment is directed toward the groove 111 to weld one end of the current collector to the inner wall of the groove 111. Figure 3 As shown, Figure 3 This is a schematic diagram of welding the terminal 001 and the current collecting member provided in an embodiment of the present application.

[0049] In this embodiment, by providing a groove 111 and a through-hole 112 on the pressing block 011 to mate with the current collector, one end of the current collector can pass through the through-hole 112 and be located within the groove 111. This allows metal shavings generated by welding the terminal 001 and the current collector to be located within the groove 111, effectively preventing the metal shavings from falling into the battery cell. This reduces the probability of battery cell short circuits and improves battery cell reliability.

[0050] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of another terminal 001 provided in an embodiment of the present application. In one embodiment, terminal 001 further includes a sealing plate 012. Sealing plate 012 is connected to pressing block 011 and closes the notch of groove 111 to define a connection cavity. The connection cavity is configured to accommodate a current collector, and the cavity wall of the connection cavity is configured to electrically connect to the current collector of the battery cell.

[0051] It can be understood that the electrical connection between the connecting cavity and the current collecting member can be that the pressing block 011 is electrically connected to the current collecting member, the sealing plate 012 is electrically connected to the current collecting member, or both the pressing block 011 and the sealing plate 012 are electrically connected to the current collecting member.

[0052] It can be understood that the sealing plate 012 is also a metal part, which can be made of copper, aluminum, or a copper-aluminum composite material.

[0053] The sealing plate 012 and the pressing block 011 are welded, specifically by girth welding.

[0054] In this embodiment, by setting the sealing plate 012, on the one hand, the notch of the groove 111 can be constrained to improve the overall strength of the terminal 001 and prevent the pressure block 011 from being deformed at the notch of the groove 111. On the other hand, the current collecting part located in the groove 111 can be protected to prevent the current collecting part from being damaged.

[0055] At the same time, when the terminal 001 is at least partially located outside the battery cell, the sealing plate 012 can be provided to improve the sealing inside the battery cell, thereby preventing the electrolyte from leaking from the terminal 001 and further improving the reliability of the battery cell.

[0056] See also Figure 5 and Figure 6 , Figure 5 yes Figure 4 The cross-sectional view of the BB, Figure 6 1 is a schematic diagram of the structure of the pressing block 011 provided in an embodiment of the present application. In one embodiment, a first step 113 is provided on the side of the groove wall of the groove 111 close to the groove opening. The first step 113 extends in a ring shape around the groove opening of the groove 111. Figure 6 As shown. The edge of the sealing plate 012 overlaps the first step 113, as shown. Figure 5 shown.

[0057] In this embodiment, by overlapping the sealing plate 012 with the first step 113, on the one hand, the sealing plate 012 can be positioned by the first step 113, thereby improving the ease of welding between the sealing plate 012 and the pressing block 011, thereby improving the welding efficiency; on the other hand, the first step 113 can increase the mating surface between the sealing plate 012 and the pressing block 011, thereby improving the reliability of the connection between the sealing plate 012 and the pressing block 011.

[0058] See also Figure 7 , Figure 7 yes Figure 6 In one embodiment, the distance between the inner circumference and the outer circumference of the first step 113 is W1, which satisfies: 0.1mm≤W1≤0.5mm.

[0059] It can be understood that the spacing W1 between the inner circumference and the outer circumference of the first step 113 includes but is not limited to 0.1mm, 0.11mm, 0.15mm, 0.17mm, 0.19mm, 0.2mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.3mm, 0.33mm, 0.37mm, 0.4mm, 0.43mm, 0.45mm, 0.48mm, and 0.5mm.

[0060] In this embodiment, by limiting the spacing W1 between the inner circumference and the outer circumference of the first step 113, on the one hand, a sufficient overlap area can be provided between the pressing block 011 and the sealing plate 012, so that the weld width between the pressing block 011 and the sealing plate 012 can meet the connection requirements, thereby ensuring the welding strength between the pressing block 011 and the sealing plate 012; on the other hand, it can avoid the spacing W1 between the inner circumference and the outer circumference of the first step 113 being too large, which leads to increased costs, thereby improving the economy of the terminal 001.

[0061] In addition, in the direction perpendicular to the bottom of the groove 111, the height of the contact surface between the sealing plate 012 and the first step 113 is 0.1mm~0.5mm. In this way, the welding penetration width between the pressing block 011 and the sealing plate 012 can meet the requirements to ensure the welding strength between the pressing block 011 and the sealing plate 012.

[0062] See also Figure 5 In one embodiment, the side of the sealing plate 012 facing away from the through-hole 112 is coplanar with the side of the pressing block 011 facing away from the through-hole 112. This allows the connecting bar to make planar contact with the terminal 001, thereby improving the ease of soldering between the terminal 001 and the connecting bar. The connecting bar is a metal component that connects multiple battery cells in series or parallel.

[0063] In one embodiment, the area of ​​the surface of the terminal 001 away from the through hole 112 is 50 mm. 2 ~300mm 2 .

[0064] It is understood that the area of ​​the surface of the terminal 001 away from the through hole 112 includes but is not limited to 50mm 2 , 60mm 2 , 80mm 2 , 91mm 2 , 100mm 2 , 110mm 2 , 120mm 2 , 154mm 2 , 175mm 2 , 190mm 2 , 200mm2 , 223mm 2 , 240mm 2 , 250mm 2 , 260mm 2 , 280mm 2 , 300mm 2 .

[0065] In this embodiment, through the above definition, the terminal 001 can have a sufficient connection area with the connection bar, thereby improving the reliability of the connection between the terminal 001 and the connection bar and ensuring the overcurrent capacity of the terminal 001.

[0066] See also Figure 5 In one embodiment, the thickness of the sealing plate 012 is D1, which satisfies: 1 mm ≤ D1 ≤ 2.5 mm.

[0067] It can be understood that the thickness D1 of the sealing plate 012 can be, but is not limited to, 1 mm, 1.1 mm, 1.25 mm, 1.4 mm, 1.5 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.4 mm, and 2.5 mm.

[0068] In this embodiment, by limiting the thickness D1 of the sealing plate 012, it can be ensured that the sealing plate 012 has sufficient welding penetration when welding with the connecting bar, thereby improving the welding strength between the terminal 001 and the connecting bar, and further improving the reliability of the connection between the terminal 001 and the connecting bar.

[0069] In one embodiment, the material of the pressing block 011 is configured to be consistent with the material of the current collecting member connected thereto, and the sealing plate 012 is an aluminum plate.

[0070] Specifically, when the current collecting member is made of copper, the material of the pressing block 011 connected to the current collecting member is also copper. When the current collecting member is made of aluminum, the material of the pressing block 011 connected to the current collecting member is also aluminum.

[0071] In this embodiment, the above arrangement allows the pressing block 011 and the current collector to be made of the same material, thereby improving the conductivity therebetween. The sealing plate 012 is made of aluminum, which can reduce the weight of the terminal 001 and thus control the weight of the battery cell.

[0072] See also Figure 7 In one embodiment, the outer surface of the pressing block 011 provided with the through hole 112 is the first surface 114. The distance between the first surface 114 and the bottom of the groove 111 is D2, which satisfies: 1mm≤D2≤3mm.

[0073] It can be understood that the distance D2 between the first surface 114 and the bottom of the groove 111 can be but is not limited to: 1mm, 1.1mm, 1.25mm, 1.4mm, 1.5mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.9mm, 3mm.

[0074] In this embodiment, by limiting the distance D2 between the first surface 114 and the bottom of the groove 111, on the one hand, the strength of the pressing block 011 can be ensured and its deformation can be avoided; on the other hand, when the current collecting piece is connected to the pressing block 011 by penetration welding, the welding penetration requirement can be ensured, thereby ensuring the welding strength between the current collecting piece and the pressing block 011.

[0075] See also Figure 7 In one embodiment, the pressing block 011 has a peripheral side wall 115 for forming the groove wall of the groove 111, and the thickness of the peripheral side wall 115 is D3, which satisfies: 1mm≤D3≤3mm.

[0076] It can be understood that the thickness D3 of the peripheral side wall 115 can be but is not limited to: 1mm, 1.1mm, 1.25mm, 1.4mm, 1.5mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.9mm, 3mm.

[0077] In this embodiment, by limiting the thickness D3 of the peripheral side wall 115 , on the one hand, the strength of the pressing block 011 can be ensured and its deformation can be avoided; on the other hand, the material of the pressing block 011 can be controlled, thereby controlling the manufacturing cost of the terminal 001 .

[0078] In one embodiment, the through hole 112 is a strip-shaped hole, and the longest diameter of the strip-shaped hole is L, which satisfies: 15 mm ≤ L ≤ 25 mm.

[0079] It can be understood that the longest diameter L of the strip hole can be but is not limited to: 15mm, 16mm, 16.5mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23.4mm, 24mm, 24.6mm, 25mm.

[0080] In this embodiment, by limiting the longest diameter L of the strip-shaped holes, the current collecting member can have an appropriate size to ensure the flow capacity of the current collecting member.

[0081] See also Figure 8 and Figure 9 , Figure 8 : is a structural diagram of the cover assembly 002 provided in an embodiment of the present application, Figure 9 yes Figure 8 Enlarged view of point D in the middle; In the second aspect, the present application provides a cover assembly 002. The cover assembly 002 includes a sealing ring 021, a cover 022, an upper plastic part 023, a lower plastic part 024, a current collecting part 025 and the aforementioned terminal 001. The cover 022 is provided with a mounting hole 221. The terminal 001 is arranged on one side of the cover 022, and the groove 111 is arranged away from the cover 022. The upper plastic part 023 is located between the cover 022 and the terminal 001, and the two sides of the upper plastic part 023 are respectively connected to the cover 022 and the terminal 001. The lower plastic part 024 is connected to the other side of the cover 022. One end of the current collecting part 025 passes through the mounting hole 221 and the through hole 112 and is connected to the terminal 001. The sealing ring 021 seals the mating part between the mounting hole 221 and the current collecting part 025.

[0082] It can be understood that the sealing ring 021 is sleeved on the current collecting member 025 .

[0083] The upper plastic part 023 can be integrally formed with the cover plate 022 and the terminal 001 by injection molding.

[0084] In addition, the outer circumference of the sealing ring 021 is in sealing engagement with the wall of the mounting hole 221, the contact portion of the upper plastic part 023, and the wall of the through hole 112. The inner circumference of the sealing ring 021 is in sealing engagement with the current collecting member 025.

[0085] In this embodiment, by using the aforementioned terminal 001, one end of the current collector 025 can pass through the through-hole 112 and then be located within the groove 111. This allows metal shavings generated by welding the terminal 001 and the current collector 025 to be located within the groove 111, effectively preventing the metal shavings from falling into the battery cell. This reduces the probability of battery cell short circuits and improves battery cell reliability.

[0086] See also Figure 10 and Figure 11 , Figure 10 is a structural diagram of the terminal 001 from another perspective provided by an embodiment of the present application. Figure 11 Figure 2 is a schematic diagram of the structure of upper plastic member 023 provided in an embodiment of the present application. In one embodiment, a connection slot 116 is provided on the side of terminal 001 near cover plate 022. A connection block 231 is provided on the side of upper plastic member 023 facing terminal 001. Connection block 231 mates with connection slot 116 and connects to the inner wall of connection slot 116.

[0087] In this embodiment, by providing the connection block 231 and the connection groove 116 , the area of ​​the connection surface between the terminal 001 and the upper plastic part 023 can be increased, thereby improving the reliability of the connection between the terminal 001 and the upper plastic part 023 .

[0088] See also Figure 12 , Figure 12 This is a schematic diagram of the structure of a battery cell 003 provided in an embodiment of the present application. Thirdly, the present application further provides a battery cell 003, which comprises a housing 031, an electrode assembly, and the aforementioned cover plate assembly 002. The electrode assembly is disposed within the housing 031. The cover plate 022 covers the housing 031. The current collector 025 is connected to the electrode assembly.

[0089] In this embodiment, by using the aforementioned cover plate assembly 002, one end of the current collector 025 can pass through the through hole 112 and then be located in the groove 111. This allows metal chips generated by welding the terminal 001 and the current collector 025 to be located in the groove 111, thereby effectively preventing the metal chips generated during welding from falling into the battery cell 003. This can reduce the probability of short circuits in the battery cell 003 and improve the reliability of the battery cell 003.

[0090] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A terminal, applied to a battery cell, characterized in that: The terminal comprises a pressing block, one side of the pressing block is provided with a groove, and the other side of the pressing block is provided with a through hole, and the through hole is connected to the groove; The through hole is configured to allow the current collecting member of the battery cell to penetrate into the groove, and the inner wall of the groove is configured to be electrically connected to the current collecting member of the battery cell.

2. The terminal according to claim 1, wherein: The terminal further includes a sealing plate connected to the pressing block and closing a notch of the groove to define a connection cavity; The connection cavity is configured to bury the current collecting member therein, and the cavity wall of the connection cavity is configured to be electrically connected to the current collecting member of the battery cell.

3. The terminal according to claim 2, characterized in that A first step is provided on the groove wall of the groove on one side close to the groove opening. The first step extends in a ring shape around the circumference of the groove opening. The edge of the sealing plate overlaps the first step.

4. The terminal according to claim 3, characterized in that The distance between the inner circumference and the outer circumference of the first step is W1, which satisfies: 0.1 mm ≤ W1 ≤ 0.5 mm.

5. The terminal according to any one of claims 2 to 4, characterized in that: A side of the sealing plate facing away from the through hole is coplanar with a side of the pressing block facing away from the through hole.

6. The terminal according to claim 5, characterized in that The area of ​​the terminal surface away from the through hole is 50mm 2 ~300mm 2 .

7. The terminal according to any one of claims 2 to 4, characterized in that: The thickness of the sealing plate is D1, which satisfies: 1mm≤D1≤2.5mm.

8. The terminal according to any one of claims 2 to 4, characterized in that: The material of the pressing block is configured to be consistent with the material of the current collecting member connected thereto, and the sealing plate is an aluminum plate.

9. The terminal according to any one of claims 1 to 4, characterized in that: The outer surface of the pressing block provided with the through hole is the first surface, and the distance between the first surface and the bottom of the groove is D2, which satisfies: 1mm≤D2≤3mm.

10. The terminal according to any one of claims 1 to 4, characterized in that: The pressing block has a peripheral side wall for forming a groove wall of the groove, and the thickness of the peripheral side wall is D3, which satisfies: 1mm≤D3≤3mm.

11. The terminal according to any one of claims 1 to 4, characterized in that: The through hole is a strip-shaped hole, and the longest diameter of the strip-shaped hole is L, which satisfies: 15mm≤L≤25mm.

12. A cover plate assembly, characterized in that: include: sealing ring; A cover plate is provided with a mounting hole; The terminal according to any one of claims 1 to 11, arranged on one side of the cover plate, and the groove is arranged away from the cover plate; an upper plastic part, located between the cover plate and the terminal, with two sides of the upper plastic part respectively connected to the cover plate and the terminal; a lower plastic part connected to the other side of the cover; and a current collecting member, one end of which passes through the mounting hole and the through hole and is connected to the terminal; Wherein, the sealing ring seals the matching portion between the mounting hole and the current collecting member.

13. The cover plate assembly according to claim 12, wherein: A connecting groove is provided on one side of the terminal close to the cover plate, and a connecting block is provided on one side of the upper plastic part facing the terminal. The connecting block cooperates with the connecting groove and is connected to the inner wall of the connecting groove.

14. A battery cell, characterized in that: include: case; an electrode assembly, disposed in the housing; And, in the cover plate assembly according to claim 12 or 13, the cover plate covers the shell, and the current collecting member is connected to the electrode assembly.

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