Pole, cover plate assembly and battery monomer

Abstract

The utility model provides a pole, a cover plate assembly and a battery monomer, and relates to the technical field of batteries. The pole comprises a first metal piece and a second metal piece; the first metal piece is provided with a peripheral surface, and an embedding groove is formed in the peripheral surface; the second metal piece is provided with a connecting groove, one end of the first metal piece is embedded in the connecting groove, an embedding block is arranged from the groove wall of the connecting groove to the first metal piece in a protruding mode, and the embedding block is embedded in the embedding groove; the thickness of the groove wall of the connecting groove is D, and the depth dimension of the embedding block embedded into the embedding groove is L1 along the radial direction of the pole, and L1 is more than 0 and less than or equal to 0.5 D. According to the scheme, the first metal piece and the second metal piece can be mutually locked in the axial direction of the pole, so that the first metal piece and the second metal piece are effectively prevented from being disconnected; and the section size of the first metal piece at the embedding groove can be ensured, so that the strength of the first metal piece is ensured, and the tensile property, the shock resistance and the like of the pole can be improved. Therefore, the reliability of the pole can be improved.

Description

Technical Field

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

[0002] The pole is an important component that connects the inside and outside of the battery cell. One end of the pole is connected to the external circuit of the battery cell, and the other end is connected to the internal cell of the power battery. In order to reduce cost and weight, the external circuit of the battery cell uses aluminum material for current transmission. However, inside the battery cell, the current collector of the negative electrode and the negative electrode sheet are made of the same material, which is copper. Therefore, in order to improve the conductivity of the pole and control the weight and cost of the battery cell, a composite pole is used to connect the negative electrode collector and the external circuit. Among them, the copper composite pole includes an aluminum part and a copper part connected to one end of the aluminum part. The copper part is located inside the battery cell and is connected to the negative electrode current collector. The aluminum part is passed through the cover plate of the battery cell, and its end away from the copper part is connected to the external circuit.

[0003] Since the copper and aluminum parts have different melting points and fluidity, the bonding reliability between them is poor, which leads to poor reliability of the terminal. Based on this, how to improve the reliability of the composite terminal is the problem to be solved by this application. Utility Model Content

[0004] The embodiments of the present application provide a pole, a cover plate assembly, and a battery cell, which can improve the reliability of a composite pole.

[0005] In a first aspect, an embodiment of the present application provides a pole, which includes a first metal part and a second metal part; the first metal part has an outer peripheral surface, and the outer peripheral surface is provided with an embedding groove; the second metal part is provided with a connecting groove, one end of the first metal part is embedded in the connecting groove, and an embedding block is protruded from the groove wall of the connecting groove toward the first metal part, and the embedding block is embedded in the embedding groove; wherein, the material of the first metal part and the material of the second metal part are different, the thickness of the groove wall of the connecting groove is D, and along the radial direction of the pole, the depth dimension of the embedding block embedded in the embedding groove is L1, satisfying: 0<L1≤0.5D.

[0006] In one embodiment, in the axial direction of the pole, the engaging block has a height dimension H1 that satisfies: D≤H1≤3D.

[0007] In one embodiment, the interlocking block includes a first interlocking portion and a second interlocking portion, wherein the first interlocking portion extends radially inward from the side of the groove wall of the connecting groove close to its opening, and the second interlocking portion extends axially outward from the side of the first interlocking portion away from the groove bottom of the connecting groove.

[0008] In one embodiment, a side wall of the second engaging portion that faces away from the axis of the pole is coplanar with the outer peripheral surface.

[0009] In an embodiment, the height dimension of the second fitting part in the axial direction of the pole is H2, and 0.5D≤H2≤2D is satisfied.

[0010] In an embodiment, the fitting groove is arranged along the circumferential line of the outer circumferential surface, and the fitting block is arranged along the circumferential line of the outer circumferential surface.

[0011] In an embodiment, the fitting groove and the fitting block are annular along the circumferential line of the outer circumferential surface.

[0012] In an embodiment, the fitting groove has a plurality of fitting grooves, and the plurality of fitting grooves are arranged at intervals along the circumferential line of the outer circumferential surface. The fitting block has a plurality of fitting blocks, and the plurality of fitting blocks and the plurality of fitting grooves are one-to-one corresponding.

[0013] In an embodiment, the wall thickness of the groove bottom of the connecting groove is consistent with the wall thickness of the groove wall of the connecting groove.

[0014] In an embodiment, the first metal piece is made of aluminum material, and the second metal piece is made of copper material.

[0015] In a second aspect, an embodiment of the present application provides a cover plate assembly, which comprises a cover plate, a pole, a terminal, an upper plastic piece, a lower plastic piece, a current collecting piece, a sealing ring, and the aforementioned pole. The pole is arranged in the cover plate. The terminal is arranged on one side of the cover plate and connected with the pole. The upper plastic piece is arranged between the terminal and the cover plate. The lower plastic piece is arranged on the other side of the cover plate. The current collecting piece is connected with one end of the pole away from the terminal. The sealing ring is arranged between the pole and the mounting hole. The material of the first metal piece is consistent with the material of the current collecting piece. The first metal piece is connected with the current collecting piece. The terminal is connected with the second metal piece, or the material of the second metal piece is consistent with the material of the current collecting piece. The second metal piece is connected with the current collecting piece. The terminal is connected with the first metal piece.

[0016] In a third aspect, an embodiment of the present application provides a battery monomer, which comprises a shell, an electrode assembly, and the aforementioned cover plate assembly. The shell has a receiving cavity. The electrode assembly is arranged in the receiving cavity. The cover plate is connected with the shell and seals the opening of the receiving cavity. The current collecting piece is also connected with the electrode assembly.

[0017] The beneficial effects of the embodiments of the present application are as follows:

[0018] In the embodiments of the present application, the second metal is embedded into the fitting groove of the first metal through the fitting block, and the embedding depth is limited. On the one hand, the first metal piece and the second metal piece can be locked in the axial direction of the pole, so as to effectively avoid the disconnection of the first metal piece and the second metal piece. On the other hand, the cross-sectional dimension of the first metal piece at the fitting groove can be ensured, so as to ensure the strength of the first metal piece, thereby improving the tensile resistance and shock resistance of the pole. In this way, the reliability of the pole can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0020] Figure 1 is a structural schematic diagram of a first pole provided by an embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of a second pole provided by an embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of a third pole provided by an embodiment of the present application;

[0023] Figure 4 is an enlarged view of B in FIG. Figure 3

[0024] Figure 5 is a sectional view of A-A in FIG. Figure 3

[0025] Figure 6 is still another structural schematic diagram of a pole provided by an embodiment of the present application; Figure 3

[0026] Figure 7 is another structural schematic diagram of a pole provided by an embodiment of the present application; Figure 3

[0027] Figure 8 is a structural schematic diagram of a cover plate assembly provided by an embodiment of the present application.

[0028] Legend of reference signs:

[0029] 011-pole; 112-first metal piece; 1121-embedded groove; 1122-outer peripheral surface; 113-second metal piece; 1131-connection groove; 1132-embedded block; 1133-first surface; 1134-first embedded part; 1135-second embedded part; 1136-groove bottom; 1137-groove wall;

[0030] 118-step;

[0031] 012-terminal;

[0032] 002-cover plate assembly; 021-cover plate; 022-upper plastic piece; 023-lower plastic piece; 024-current collecting piece. DETAILED DESCRIPTION

[0033] ​​​​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.

[0034] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application. In the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] In the description of this application, it should be noted that, unless otherwise 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 or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0036] Rather, the terms "comprises," "comprising," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0037] 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.

[0038] To facilitate understanding of the solution of the present application, the spline curves and arrows used in the drawings are explained here: the components indicated by the spline curves without arrows are solid components, that is, components with solid structures; the components indicated by the spline curves with arrows are virtual components, that is, components without solid structures.

[0039] See also Figure 1, an embodiment of the present application provides a pole 011. The pole 011 includes a first metal part 112 and a second metal part 113. The first metal part 112 has an outer peripheral surface 1122. The outer peripheral surface 1122 is provided with an interlocking groove 1121. The second metal part 113 is provided with a connecting groove 1131. One end of the first metal part 112 is interlocked in the connecting groove 1131. An interlocking block 1132 is protruded from the groove wall of the connecting groove 1131 toward the first metal part 112. The interlocking block 1132 is interlocked in the interlocking groove 1121. The material of the first metal part 112 and the material of the second metal part 113 are different. The thickness of the groove wall of the connecting groove 1131 is D. Along the radial direction of the pole 011, the depth dimension of the interlocking block 1132 embedded in the interlocking groove 1121 is L1, satisfying: 0<L1≤0.5D.

[0040] It can be understood that the depth dimension L1 of the engaging block 1132 embedded in the engaging groove 1121 includes but is not limited to 0.1D, 0.15D, 0.2D, 0.23D, 0.28D, 0.3D, 0.36D, 0.39D, 0.4D, 0.42D, 0.45D, 0.46D, and 0.5D.

[0041] For example, taking a square pole 011 as an example, the wall thickness D of the second metal member 113 used therein is 0.5 mm. Correspondingly, the depth dimension L1 of the engaging block 1132 embedded in the engaging groove 1121 is 0<L1≤0.25 mm.

[0042] In addition, the first metal is electrically connected to the current collecting part, the first metal is copper material, and correspondingly, the second metal is aluminum material, which is connected to terminal 012; the second metal can also be electrically connected to the current collecting part 024, the second metal is copper material, and the first metal can be aluminum material, which is connected to terminal 012.

[0043] It is understandable that the first metal part 112 can be cast first, and then the second metal part 113 can be cast on the first metal part 112 so that the interlocking block 1132 and the interlocking groove 1121 can be matched; the interlocking block 1132 and the interlocking groove 1121 can also be matched by using a pier pressing method.

[0044] In this embodiment, by embedding the second metal member into the first metal member's embedding groove 1121 via the embedding block 1132 and limiting the embedding depth, the first metal member 112 and the second metal member 113 are interlocked axially with each other in the terminal 011, effectively preventing the first metal member 112 and the second metal member 113 from becoming disconnected. Furthermore, the cross-sectional dimensions of the first metal member 112 at the embedding groove 1121 are maintained, ensuring the strength of the first metal member 112, thereby improving the tensile and seismic resistance of the terminal 011. This improves the reliability of the terminal 011.

[0045] In addition, in addition to Figure 1 The pole 011 structure shown in FIG. 1 may also be displayed in other structures, for example, Figure 2 The pole 011 structure shown, Figure 2 This is a schematic structural diagram of the second type of pole 011 provided in an embodiment of the present application.

[0046] Furthermore, limiting the maximum value of the depth dimension L1 of the engaging block 1132 embedded in the engaging groove 1121 can improve the uniformity of the flow of the second metal component in the engaging groove 1121 and prevent the second metal component from being torn when the pole 011 is press-formed.

[0047] See also Figure 1 In one embodiment, in the axial direction of the pole 011 , the engaging block 1132 has a height dimension H1 , satisfying: D≤H1≤3D.

[0048] It can be understood that the height dimension H1 of the engaging block 1132 includes but is not limited to D, 1.2D, 1.5D, 1.6D, 1.8D, 1.9D, 2D, 2.2D, 2.3D, 2.5D, 2.6D, 2.7D, 2.8D, 2.9D, and 3D.

[0049] In this embodiment, by limiting the height dimension H1 of the engaging block 1132, on the one hand, it can avoid being too small, resulting in insufficient strength of the engaging portion between the first metal part 112 and the second metal part 113, thereby effectively ensuring the reliability of the connection between the first metal part 112 and the second metal part 113; on the other hand, it can avoid being too large, resulting in higher material costs, so as to control the material cost of the pole 011, which is beneficial to improving the economy of the battery cell.

[0050] See also Figure 3 and Figure 4 , Figure 3 This is a schematic structural diagram of the third type of pole 011 provided in an embodiment of the present application. Figure 4 yes Figure 3Enlarged view of point B in the middle. In one embodiment, the interlocking block 1132 includes a first interlocking portion 1134 and a second interlocking portion 1135. The first interlocking portion 1134 extends radially inward from the side of the groove wall 1137 of the connecting groove 1131 close to its opening, and the second interlocking portion 1135 extends axially outward from the side of the first interlocking portion 1134 away from the groove bottom 1136 of the connecting groove 1131. In this way, a step 118 is formed between the second metal part 113 and the second interlocking portion 1135. Therefore, when the pole 011 is connected to other components, the other components can be positioned based on the step 118. In this way, not only can the ease of connection between the pole 011 and other components be improved, but the position of the second metal part 113 located in the interlocking block 1132 can also be limited by other components to improve the reliability of the connection between the first metal part 112 and the second metal part 113.

[0051] Furthermore, when first metal member 112 is copper and second metal member 113 is aluminum, terminal 012 is sleeved onto the end of first metal member 112 facing away from second metal member 113 and engages with step 118. After the major components of cover assembly 002 are assembled and before terminal 012 is welded to pole 011, pole 011 is pressed. This causes pole 011 to expand radially, forming an aluminum (terminal 012)-copper (second metal member 113)-aluminum (first metal member 112) bonding surface at step 118. Due to the varying fluidity of different metals, the aluminum-copper-aluminum bonding surface is uneven, ensuring a more secure bond.

[0052] The step 118 includes a first surface 1133 perpendicular to the axis of the pole 011 and a peripheral wall arranged around the axis of the pole 011. The first surface 1133 extends into a ring shape around the circumference of the pole 011, and its inner diameter side is connected to one end of the peripheral wall.

[0053] See also Figure 3 In one embodiment, the sidewall of the second engaging portion 1135 that faces away from the axis of the pole 011 is coplanar with the outer peripheral surface 1122. This can regularize the surface structure of the pole 011, thereby simplifying the structure of the components that cooperate with it.

[0054] For example, when first metal member 112 is mated with terminal 012, terminal 012 is sleeved over the end of first metal member 112 facing away from second metal member 113 and engages with step 118. Because the sidewall of engaging block 1132 facing away from the axis of terminal 011 is coplanar with outer circumferential surface 1122, the mating hole in terminal 012 can be of uniform diameter, simplifying the production process of terminal 012.

[0055] See also Figure 3In one embodiment, the second engaging portion 1135 is axially located in the pole 011. The height dimension of the second engaging portion 1135 is H2, which satisfies the following: 0.5D≤H2≤2D.

[0056] It can be understood that the height dimension H2 of the engaging block 1132 located outside the connecting groove 1131 includes but is not limited to 0.5D, 0.6D, 0.8D, 1D, 1.1D, 1.2D, 1.5D, 1.6D, 1.8D, and 2D.

[0057] In this embodiment, through the above-mentioned limitation, on the one hand, it can be ensured that the second metal part 113 has a sufficient height dimension H2 on the forming step 118, so as to increase the mating surface between the component that cooperates with the step 118 and the engaging block 1132, thereby improving the limiting effect of the component on the engaging block 1132, so that the engaging block 1132 can be stably matched with the engaging groove 1121; on the other hand, it can avoid the height dimension H2 being too large and covering more of the circumferential side wall of the first metal part 112, thereby ensuring that the circumferential side wall of the first metal part 112 has sufficient area for connection with other components.

[0058] In one embodiment, the engaging groove 1121 extends along the circumference of the outer peripheral surface 1122, and the shape and size of the engaging block 1132 are consistent with the shape and size of the engaging groove 1121. This increases the mating area between the engaging groove 1121 and the engaging block 1132, thereby improving the reliability of the connection between the first metal member 112 and the second metal member 113.

[0059] It can be understood that the shape and size of the interlocking block 1132 are consistent with the shape and size of the interlocking groove 1121, which means that the interlocking block 1132 can have a dimensional error with the interlocking groove 1121 within a certain range, and this dimensional error does not affect the connection between the first metal part 112 and the second metal part 113.

[0060] Furthermore, it is understood that when using ram forming, the side of the engaging block 1132 facing away from the bottom of the connecting groove 1131 may contact the groove wall of the engaging groove 1121, or there may be a gap therebetween. Furthermore, the side of the engaging block 1132 facing away from the bottom of the connecting groove 1131 may be coplanar, or may have an uneven structure formed by ram forming, or other structures.

[0061] See also Figure 5 , Figure 5 The embodiments of this application provide Figure 3 In one embodiment, the interlocking groove 1121 extends in an annular shape along the circumference of the outer peripheral surface 1122. This increases the mating area between the interlocking groove 1121 and the interlocking block 1132, thereby improving the reliability of the connection between the first metal member 112 and the second metal member 113.

[0062] Furthermore, such a configuration can also increase the engagement strength between the first metal member 112 and the second metal member 113 to avoid relative rotation therebetween.

[0063] In another embodiment, Figure 3 The cross-sectional view of AA can be a rectangle, such as Figure 6 As shown, Figure 6 This embodiment of the present application provides another Figure 3 Cross-sectional view of AA in the figure.

[0064] See also Figure 7 , Figure 7 This is another embodiment of the present application. Figure 3 Cross-sectional view taken along line AA in FIG. In one embodiment, there are multiple interlocking grooves 1121. The multiple interlocking grooves 1121 are spaced apart along the circumference of the outer peripheral surface 1122. There are multiple interlocking blocks 1132, each corresponding one-to-one to the multiple interlocking grooves 1121. This increases the mating area between the interlocking grooves 1121 and the interlocking blocks 1132, thereby improving the reliability of the connection between the first metal member 112 and the second metal member 113.

[0065] The plurality of engaging grooves 1121 are evenly distributed along the circumference of the outer peripheral surface 1122 .

[0066] See also Figure 3 In one embodiment, the wall thickness of the bottom of the connecting groove 1131 is consistent with the wall thickness of the connecting groove 1131 .

[0067] It is understood that the wall thickness of the bottom of the connecting groove 1131 and the wall thickness of the connecting groove 1131 are both D. Of course, after the pole 011 is formed by piercing, the wall thickness of the bottom of the groove and the wall thickness of the groove can have a difference within a certain range, and the wall thickness of the bottom of the groove and the wall thickness within this difference can be considered to be consistent.

[0068] In this embodiment, the above arrangement enables the second metal member 113 to have a simple structure and be easily formed.

[0069] In one embodiment, the first metal member 112 is made of aluminum, and the second metal member 113 is made of copper. This creates a copper-clad aluminum structure. This not only allows the electrode 011 to have a larger copper surface area, ensuring a reliable connection between the electrode 011 and the current collector, but also protects the aluminum due to the copper's greater strength and durability, reducing the risk of damage to the electrode 011.

[0070] See also Figure 8Accordingly, an embodiment of the present application further provides a cover plate assembly 002. The cover plate assembly 002 includes a cover plate 021, a pole 011, a terminal 012, an upper plastic part 022, a lower plastic part 023, a current collecting part 024, a sealing ring, and the aforementioned pole 011. The pole 011 is passed through the cover plate 021. The terminal 012 is located on one side of the cover plate 021 and is connected to the pole 011. The upper plastic part 022 is arranged between the terminal 012 and the cover plate 021. The lower plastic part 023 is arranged on the other side of the cover plate 021. The current collecting part 024 is connected to one end of the pole 011 away from the terminal 012. The sealing ring is arranged between the pole 011 and the mounting hole. Among them, the material of the first metal part 112 is consistent with the material of the current collecting part 024, the first metal part 112 is connected to the current collecting part 024, and the terminal 012 is connected to the second metal part 113; or, the material of the second metal part 113 is consistent with the material of the current collecting part 024, the second metal part 113 is connected to the current collecting part 024, and the terminal 012 is connected to the first metal part 112.

[0071] It can be understood that when the first metal part 112 is made of copper, the first metal part 112 is connected to one end of the current collecting part 024, and the terminal 012 is connected to the second metal part 113; when the second metal part 113 is made of copper, the second metal part 113 is connected to one end of the current collecting part 024, and the terminal 012 is connected to the first metal part 112.

[0072] In this embodiment, by using the terminal 011 provided in some embodiments of the present application, the first metal member 112 and the second metal member 113 can be interlocked in the axial direction of the terminal 011, effectively preventing the first metal member 112 and the second metal member 113 from becoming disconnected. Furthermore, the strength of the interlocking structure between the first metal member 112 and the second metal member 113 can be ensured, thereby improving the tensile and seismic resistance of the terminal 011. This improves the reliability of the connection between the first metal member 112 and the second metal member 113, thereby improving the reliability of the cover assembly 002.

[0073] Accordingly, embodiments of the present application also provide a battery cell. The battery cell includes a housing, an electrode assembly, and the aforementioned cover plate assembly 002. The housing has a receiving cavity. The electrode assembly is disposed within the receiving cavity. A cover plate 021 is connected to the housing and seals the opening of the receiving cavity. A current collector 024 is also connected to the electrode assembly.

[0074] In this embodiment, by using the cover plate assembly 002 provided in some embodiments of the present application, on the one hand, the first metal member 112 and the second metal member 113 can be mutually locked in the axial direction of the terminal 011, effectively preventing the first metal member 112 and the second metal member 113 from becoming disconnected; on the other hand, the strength of the interlocking structure between the first metal member 112 and the second metal member 113 can be ensured, thereby improving the tensile and seismic resistance of the terminal 011. In this way, the reliability of the connection between the first metal member 112 and the second metal member 113 can be improved, thereby improving the reliability of the battery cell.

[0075] The technical solutions and technical effects of the present application are described in detail below through specific embodiments. The following embodiments are only some embodiments of the present application and do not specifically limit the present application.

[0076] This embodiment aims to investigate the effect of the depth L1 of the engaging block 1132 embedded in the engaging groove 1121 on the tensile strength of the pole 011. It is understood that the depth L1 of the engaging block 1132 embedded in the engaging groove 1121 is consistent with the depth of the engaging groove 1121.

[0077] The test contents of the embodiment are described as follows:

[0078] 1. Test related instructions

[0079] (1) The simulation software used for the test is LSDYNA.

[0080] (2) The first metal member 112 is made of aluminum, and its outer diameter is 20 mm; the second metal member 113 is made of copper, and its thickness D is 0.8 mm.

[0081] (3) The height dimension H1 of the engaging block 1132 when engaged in the engaging groove 1121 is 0.8 mm.

[0082] 2. Test Results

[0083] The pole 011 with L1 of 0.4D = 0.32mm, 0.5D = 0.4mm, D = 0.8mm and 2D = 1.6mm was selected for tensile testing. The tensile force values ​​at which the pole 011 is destroyed are as follows:

[0084]

[0085] Table 1. Tensile test of pole 011

[0086] The damage to the pole 011 mainly refers to the damage to the first metal component 112 .

[0087] Table 1 shows that as the depth L1 of the engaging block 1132 embedded in the engaging groove 1121 increases, the tensile force required to destroy the pole 011 gradually decreases, i.e., the tensile strength of the pole 011 gradually decreases. When the tensile strength reaches 36110 N, the strength requirement of the pole 011 is not met.

[0088] Therefore, in order to ensure the tensile strength of the pole 011 while meeting the requirements for the engagement between the first metal member 112 and the second metal member 113 , the depth L1 of the engagement block 1132 embedded in the engagement groove 1121 should not be greater than 0.5D.

[0089] 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 pole, characterized in that: include: A first metal member having an outer peripheral surface, wherein the outer peripheral surface is provided with an engaging groove; a second metal member having a connecting groove, one end of the first metal member being engaged with the connecting groove, and an engaging block protruding from a groove wall of the connecting groove toward the first metal member, the engaging block being engaged with the engaging groove; The material of the first metal part is different from that of the second metal part, the thickness of the groove wall of the connecting groove is D, the depth dimension of the embedding of the embedding block in the embedding groove is L1, and the following is satisfied: 0<L1≤0.5D.

2. The pole according to claim 1, characterized in that In the axial direction of the pole, the engaging block has a height dimension H1, which satisfies: D≤H1≤3D.

3. The pole according to claim 1, characterized in that The interlocking block includes a first interlocking portion and a second interlocking portion. The first interlocking portion extends radially inward from the side of the groove wall of the connecting groove close to its opening, and the second interlocking portion extends axially outward from the side of the first interlocking portion away from the groove bottom of the connecting groove.

4. The pole according to claim 3, characterized in that The side wall of the second fitting portion, which is away from the pole axis, is coplanar with the outer peripheral surface.

5. The pole according to claim 3, characterized in that: In the axial direction of the pole, the height dimension of the second fitting portion is H2, which satisfies: 0.5D≤H2≤2D.

6. The pole according to any one of claims 1 to 4, characterized in that: The fitting groove is extended along the circumference of the outer peripheral surface, and the fitting block is extended along the circumference of the outer peripheral surface.

7. The pole according to claim 6, characterized in that The fitting groove and the fitting block both extend in a ring shape along the circumference of the outer peripheral surface.

8. The pole according to any one of claims 1 to 4, characterized in that: There are a plurality of the fitting grooves, which are arranged at intervals along the circumference of the outer peripheral surface; there are a plurality of the fitting blocks, which correspond one to one to the fitting grooves.

9. The pole according to any one of claims 1 to 4, characterized in that: The wall thickness of the groove bottom of the connecting groove is consistent with the wall thickness of the groove wall of the connecting groove.

10. The pole according to any one of claims 1 to 4, characterized in that: The first metal component is made of aluminum, and the second metal component is made of copper.

11. A cover plate assembly, characterized in that: include: cover; The pole according to any one of claims 1 to 10, wherein the pole is provided through the cover plate; A terminal is located on one side of the cover plate and connected to the pole; an upper plastic part, disposed between the terminal and the cover plate; a lower plastic part, arranged on the other side of the cover; a current collecting member connected to an end of the pole away from the terminal; A sealing ring is provided between the pole and the mounting hole; Wherein, the material of the first metal part is consistent with the material of the current collecting part, the first metal part is connected to the current collecting part, and the terminal is connected to the second metal part, or the material of the second metal part is consistent with the material of the current collecting part, the second metal part is connected to the current collecting part, and the terminal is connected to the first metal part.

12. A battery cell, characterized in that: include: A housing having a receiving cavity; an electrode assembly, disposed in the accommodating cavity; And, in the cover plate assembly according to claim 11, the cover plate is connected to the shell and closes the opening of the accommodating cavity, and the current collecting member is also connected to the electrode assembly.

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