Polar posts, cover plate assemblies, and battery cells

Abstract

The pole column includes a first metal member 112 and a second metal member 113. The first metal member has a fitting groove 1121 provided thereon and an outer peripheral surface. A connection groove 1131 is provided in the second metal member. One end of the first metal member is fitted into the connection groove, and a fitting block 1132 protrudes from the groove wall of the connection groove toward the first metal member. The fitting block is fitted into the fitting groove. When the thickness of the groove wall of the connection groove is D and the dimension of the depth at which the fitting block is fitted into the fitting groove of the first metal member in the radial direction of the pole column is L1, 0 < L1 ≤ 0.5D is satisfied. 【Effect】According to the above, the first metal member and the second metal member are locked to each other in the axial direction of the pole column, effectively avoiding detachment from the connection between the first metal member and the second metal member. Moreover, by ensuring the cross-sectional dimension of the first metal member in the fitting groove and ensuring the strength of the first metal member, the performance such as the tensile resistance and vibration resistance of the pole column can be improved. Thereby, the reliability of the pole column can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and specifically to pole posts, cover plate assemblies, and battery cells.

Background Art

[0002] The pole post is an important component that connects the inside and outside of the battery cell. One end of the pole post is connected to the external circuit of the battery cell, and the other end is connected to the cells inside the power battery. To reduce costs and weight, an aluminum material is used for current transmission in the external circuit of the battery cell. However, the materials of the negative electrode current collector member and the current collector of the negative electrode sheet inside the battery cell are the same, and these are copper materials.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, in order to improve the conductivity of the pole post and suppress the weight and cost of the battery cell, a composite pole post is used to connect the negative electrode current collector member and the external circuit. Here, the copper composite pole post includes an aluminum member and a copper member connected to one end of the aluminum member. The copper member is located inside the battery cell and is connected to the negative electrode current collector member, and the aluminum member is penetrated through the cover plate of the battery cell, and the end away from the copper member is connected to the external circuit.

[0004] Since the copper member and the aluminum member have different melting points and different material fluidities, the bonding reliability between them is poor, and as a result, the reliability of the pole post is poor. Under such a background, how to improve the reliability of the composite pole post is one of the problems to be solved by this application.

[0005] Embodiments of this application provide a pole post, a cover plate assembly, and a battery cell that can improve the reliability of the composite pole post.

[0006] In a first aspect, an embodiment of the present application provides a terminal post, which includes a first metal member and a second metal member. The first metal member has an outer peripheral surface provided with a fitting groove, and the second metal member is provided with a connection groove. One end of the first metal member is fitted into the connection groove, and a fitting block protrudes from the groove wall of the connection groove towards the first metal member. The fitting block is fitted into the fitting groove. Here, the materials of the first metal member and the second metal member are different. If the thickness of the groove wall of the connection groove is D and the dimension of the depth at which the fitting block is fitted into the fitting groove is L1, then 0 < L1 ≤ 0.5D is satisfied.

[0007] In one embodiment, in the axial direction of the terminal post, the fitting block has a height dimension H1, and D ≤ H1 ≤ 3D is satisfied.

[0008] In one embodiment, the fitting block includes a first fitting portion and a second fitting portion. The first fitting portion extends inwards along the radial direction from the side near the opening of the groove wall of the connection groove, and the second fitting portion extends outwards along the axial direction from the side away from the groove bottom of the connection groove in the first fitting portion.

[0009] In one embodiment, the side wall of the second fitting portion away from the axis of the terminal post is flush with the outer peripheral surface.

[0010] In one embodiment, if the height dimension of the second fitting portion in the axial direction of the terminal post is H2, then 0.5D ≤ H2 ≤ 2D is satisfied.

[0011] In one embodiment, the fitting groove extends along the contour of the outer peripheral surface, and the fitting block extends along the contour of the outer peripheral surface.

[0012] In one embodiment, both the fitting groove and the fitting block extend annularly along the contour of the outer peripheral surface.

[0013] In one embodiment, a plurality of fitting grooves are provided at intervals along the contour of the outer peripheral surface, a plurality of fitting blocks are provided, and the plurality of fitting blocks correspond to the plurality of fitting grooves one by one.

[0014] In one embodiment, the thickness of the bottom of the connecting groove matches the thickness of the groove wall.

[0015] In one embodiment, the first metal member is made of aluminum, and the second metal member is made of copper.

[0016] In a second embodiment, the present invention provides a cover plate assembly comprising a cover plate, terminals, an upper resin member, a lower resin member current collector, a seal ring, and the aforementioned pole post, wherein the cover plate has mounting holes, the pole post is inserted through the mounting holes of the cover plate, the terminal is located on one side of the cover plate and connected to the pole post, the upper resin member is provided between the terminal and the cover plate, the lower resin member is provided on the other side of the cover plate, the current collector is connected to the end of the pole post away from the terminal, and the seal ring is provided between the pole post and the mounting hole, wherein if the material of the first metal member matches the material of the current collector, the first metal member is connected to the current collector and the terminal is connected to the second metal member, or if the material of the second metal member matches the material of the current collector, the second metal member is connected to the current collector and the terminal is connected to the first metal member.

[0017] In a third embodiment, an embodiment of the present invention provides a battery cell comprising a case, an electrode assembly, and the aforementioned cover plate assembly, wherein the case has a housing chamber, the electrode assembly is provided within the housing chamber, the cover plate is connected to the case to close the opening of the housing chamber, and the current collector is further connected to the electrode assembly. [Effects of the Invention]

[0018] In this embodiment, by fitting the second metal into the fitting groove of the first metal by means of a fitting block and defining the fitting depth, the first metal member and the second metal member can be locked to each other in the axial direction of the pole column, thereby effectively avoiding detachment from the connection between the first metal member and the second metal member. At the same time, the cross-sectional dimension of the first metal member in the fitting groove can be ensured, and the strength of the first metal member can be ensured, thereby improving the performance such as the tensile resistance and vibration resistance of the pole column. Thereby, the reliability of the pole column can be improved.

Brief Description of the Drawings

[0019] In order to more clearly explain the technical solution in the embodiment of the present application, the drawings necessary for the description of the embodiment will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, based on these drawings, other drawings can be obtained on the premise of not performing creative labor.

[0020] [Figure 1] It is a schematic structural diagram of a pole column of the first form according to the embodiment of the present application. [Figure 2] [[ID=1​​​​​​​​​​​​​​​​​​​​​​​​​Hereinafter, while referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are included in the protection scope of the present application.

[0022] Also, it should be understood that the specific embodiments described herein are only for the purpose of explaining and interpreting the present application, and do not limit the present application. In the present application, the terms "first" and "second" are only for the purpose of explanation, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the above features. In the description of the present application, "plurality" means two or more unless otherwise specified.

[0023] In addition, in the description of the present application, unless specifically defined and limited, the terms "attach", "connect", and "couple" should be understood broadly. For example, it may be a fixed connection, a removable connection, or an integrated connection, or a mechanical connection or an electrical connection. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific situation.

[0024] Also, the terms "include", "comprise", and any variation thereof are intended to cover non-exclusive inclusion. Thus, a product containing a series of elements is considered to include not only those elements but also other elements not explicitly listed.

[0025] Terms such as "as an example" or "for example" in the description of the embodiments of the present application are used to indicate examples, explanations, or descriptions. Any embodiment or design described as "as an example" or "for example" in the embodiments of the present application is not construed as being more preferable or having more advantages than other embodiments or designs. Terms such as "as an example" or "for example" are intended to clearly express relative concepts.

[0026] To facilitate the understanding of the technical solution of the present application, the spline curves and arrows used in the reference numerals in the drawings will be described herein. The member indicated by the spline curve without an arrow is a solid member, that is, a member having a solid structure. The member indicated by the spline curve with an arrow is a virtual member, that is, a member having no solid structure.

[0027] Referring to FIG. 1, an embodiment of the present application provides a terminal post 011. The terminal post 011 includes a first metal member 112 and a second metal member 113. The first metal member 112 has an outer peripheral surface 1122. A fitting groove 1121 is provided on the outer peripheral surface 1122. A connection groove 1131 is provided in the second metal member 113. One end of the first metal member 112 is fitted into the connection groove 1131. A fitting block 1132 protrudes from the groove wall of the connection groove 1131 toward the first metal member 112. The fitting block 1132 is fitted into the fitting groove 1121. Here, the materials of the first metal member 112 and the second metal member 113 are different. The thickness of the groove wall of the connection groove 1131 is D. When the dimension of the depth at which the fitting block 1132 is fitted into the fitting groove 1121 in the radial direction of the terminal post 011 is L1, 0 < L1 ≤ 0.5D is satisfied.

[0028] As can be understood, the dimension L1 of the depth at which the fitting block 1132 is fitted into the fitting 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, 0.5D.

[0029] For example, taking a certain rectangular pole column 011 as an example, the wall thickness D of the second metal member 113 used in it is 0.5 mm. Correspondingly, the dimension L1 of the depth to which the fitting block 1132 fits into the fitting groove 1121 is 0 <L1≦0.25mmである。

[0030] Furthermore, the first metal member is electrically connected to the current collector, in which case the first metal member is made of copper, and correspondingly the second metal member is made of aluminum, and the second metal member is connected to terminal 012. Alternatively, the second metal member may be electrically connected to the current collector. In this case, the second metal member is made of copper, the first metal member is made of aluminum, and the first metal member is connected to terminal 012.

[0031] To make it easier to understand, first the first metal member 112 is injection molded, and then the second metal member 113 is injection molded onto the first metal member 112, thereby enabling the fitting block 1132 and the fitting groove 1121 to be fitted together. Alternatively, the fitting block 1132 and the fitting groove 1121 can also be fitted together by employing an upset processing method.

[0032] In this embodiment, the second metal member is fitted into the fitting groove 1121 of the first metal member by the fitting block 1132, and the fitting depth is defined, thereby locking the first metal member 112 and the second metal member 113 together in the axial direction of the pole column 011. This effectively prevents the first metal member 112 and the second metal member 113 from coming apart, while ensuring the cross-sectional dimensions of the first metal member 112 in the fitting groove 1121 and thus ensuring the strength of the first metal member 112. This improves the performance of the pole column 011, such as its tensile resistance and vibration resistance. As a result, the reliability of the pole column 011 can be improved.

[0033] Furthermore, in addition to the structure of the pole column 011 shown in Figure 1, the pole column 011 in this embodiment may be represented by adopting other structures, such as the structure of the pole column 011 shown in Figure 2, and Figure 2 is a schematic diagram of the structure of the pole column 011 of the second embodiment according to the present application.

[0034] Furthermore, by defining the maximum value of the depth dimension L1 into which the fitting block 1132 is fitted into the fitting groove 1121, the uniformity of the flow of the second metal member within the fitting groove 1121 can be improved when the pole column 011 is formed by processing, and the occurrence of cracks in the second metal member due to tension can be prevented.

[0035] As shown in Figure 1, in one embodiment, the fitting block 1132 has a height dimension H1 in the axial direction of the pole column 011, and satisfies D ≤ H1 ≤ 3D.

[0036] To ensure clarity, the height dimension H1 of the interlocking 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.

[0037] In this embodiment, by defining the height dimension H1 of the fitting block 1132, it is possible to prevent insufficient strength of the fitting portion between the first metal member 112 and the second metal member 113 due to an insufficient H1, thereby effectively ensuring the reliability of the joint between the first metal member 112 and the second metal member 113. At the same time, it is possible to avoid soaring material costs due to an excessive H1, thereby contributing to improved economic efficiency of the battery cell by suppressing the material cost of the pole column 011.

[0038] Referring to Figures 3 and 4, Figure 3 is a schematic diagram of the structure of a pole column 011 of a third embodiment according to an embodiment of the present application, and Figure 4 is an enlarged view of B in Figure 3. In one embodiment, the fitting block 1132 includes a first fitting portion 1134 and a second fitting portion 1135, the first fitting portion 1134 extending radially inward from the side near the opening in the groove wall 1137 of the connecting groove 1131, and the second fitting portion 1135 extending axially outward from the side of the first fitting portion 1134 away from the groove bottom 1136 of the connecting groove 1131. In this way, a stepped portion 118 is formed between the second metal member 113 and the second fitting portion 1135. This allows the other parts to be positioned by the stepped portion 118 when connecting the pole column 011 to other parts. In this way, not only can the operability of the connection between the pole 011 and other parts be improved, but the reliability of the joint between the first metal member 112 and the second metal member 113 can also be improved by regulating the position of the portion of the second metal member 113 located on the fitting block 1132 by the other parts.

[0039] Furthermore, if the first metal member 112 is made of copper and the second metal member 113 is made of aluminum, the terminal 012 is fitted onto the end of the first metal member 112 away from the second metal member 113 and locked into the stepped portion 118. After the assembly of each main component of the cover plate assembly 002 is completed, and before welding the terminal 012 to the pole post 011, the pole post 011 can be expanded radially by upsetting it, thereby forming a joint surface of aluminum (terminal 012)-copper (second metal member 113)-aluminum (first metal member 112) at the stepped portion 118. Because the fluidity of the metals differs, the joint surface between aluminum-copper-aluminum becomes uneven, resulting in a more reliable bond.

[0040] Here, the stepped portion 118 includes a first surface 1133 perpendicular to the axis of the pole column 011 and a peripheral wall configured to surround the axis of the pole column 011. The first surface 1133 extends in an annular shape along the circumference of the pole column 011, and its inner diameter side is connected to one end of the peripheral wall.

[0041] Referring to Figure 3, in one embodiment, the side wall of the second fitting portion 1135 that is away from the axis of the pole column 011 is flush with the outer surface 1122. In this way, the surface structure of the pole column 011 can be standardized, which is advantageous in simplifying the structure of the parts that are fitted to the pole column 011.

[0042] For example, when the first metal member 112 is fitted with the terminal 012, the terminal 012 is fitted onto the end of the first metal member 112 away from the second metal member 113 and locked into the stepped portion 118. Since the side wall of the fitting block 1132 away from the axis of the pole column 011 is flush with the outer surface 1122, the hole in the terminal 012 that fits with it can be a hole of equal diameter, thereby simplifying the manufacturing process of the terminal 012.

[0043] Referring to Figure 3, in one embodiment, if the height dimension of the second fitting portion 1135 in the axial direction of the pole column 011 is H2, then 0.5D ≤ H2 ≤ 2D is satisfied.

[0044] To ensure clarity, the height dimension H2 located outside the connecting groove 1131 of the mating block 1132 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.

[0045] In this embodiment, by defining it as described above, it is possible to ensure that the stepped portion 118 formed by the second metal member 113 has a sufficient height dimension H2. This makes it easier to increase the fitting surface between the part that fits with the stepped portion 118 and the fitting block 1132, thereby improving the positional restricting effect of the part on the fitting block 1132, and thus enabling the fitting block 1132 to be stably fitted into the fitting groove 1121. On the other hand, it is possible to prevent the height dimension H2 from being too large and covering too much of the circumferential side wall of the first metal member 112, thereby ensuring that the circumferential side wall of the first metal member 112 has a sufficient area for connection with other parts.

[0046] In one embodiment, the fitting groove 1121 extends along the circumference of the outer surface 1122, and the dimensions of the fitting block 1132 match the dimensions of the fitting groove 1121. In this way, the fitting area between the fitting groove 1121 and the fitting block 1132 can be increased, thereby improving the reliability of the joint between the first metal member 112 and the second metal member 113.

[0047] To make it easier to understand, the fact that the dimensions of the fitting block 1132 match the dimensions of the fitting groove 1121 means that the fitting block 1132 and the fitting groove 1121 may have dimensional errors within a certain range, and that these dimensional errors do not impair the connection between the first metal member 112 and the second metal member 113.

[0048] Furthermore, to make it easier to understand, when upset molding is employed, the side of the fitting block 1132 away from the bottom of the connecting groove 1131 may be in contact with the groove wall of the fitting groove 1121, or there may be a gap. Moreover, the side of the fitting block 1132 away from the bottom of the connecting groove 1131 may be a coplanar structure, an upset-molded uneven structure, or other structure.

[0049] Referring to Figure 5, which is a cross-sectional view of AA in Figure 3 according to an embodiment of the present application. In one embodiment, the fitting groove 1121 extends in an annular shape along the circumference of the outer surface 1122. In this way, the fitting area between the fitting groove 1121 and the fitting block 1132 can be increased, thereby improving the reliability of the joint between the first metal member 112 and the second metal member 113.

[0050] By configuring it in this way, the fitting strength between the first metal member 112 and the second metal member 113 can be improved, and relative rotation between them can be prevented.

[0051] In another embodiment, the cross-sectional view of AA in Figure 3 may be rectangular, as shown in Figure 6, which is another cross-sectional view of AA in Figure 3 according to an embodiment of the present application.

[0052] Referring to Figure 7, which is a cross-sectional view of AA in Figure 3, another embodiment of the present application. In one embodiment, a plurality of fitting grooves 1121 are provided. The plurality of fitting grooves 1121 are spaced apart along the circumference of the outer surface 1122. A plurality of fitting blocks 1132 are provided, and there is a one-to-one correspondence between the plurality of fitting blocks 1132 and the plurality of fitting grooves 1121. In this way, the fitting area between the fitting grooves 1121 and the fitting blocks 1132 can be increased, thereby improving the reliability of the joint between the first metal member 112 and the second metal member 113.

[0053] Here, the multiple fitting grooves 1121 are evenly distributed at equal intervals along the circumference of the outer surface 1122.

[0054] Referring to Figure 3, in one embodiment, the thickness of the groove bottom of the connecting groove 1131 is the same as the thickness of the groove wall of the connecting groove 1131.

[0055] To make it easier to understand, the thickness of the groove bottom and the thickness of the groove wall of the connecting groove 1131 are both D. Of course, after the pole column 011 is formed by upsetting, there may be a difference within a certain range between the thickness of the groove bottom and the thickness of the groove wall, but the thickness of the groove bottom and the thickness of the groove wall within this difference can be considered to be the same.

[0056] In this embodiment, the structure of the second metal member 113 is simplified and molding is made easier with the above configuration.

[0057] In one embodiment, the first metal member 112 is made of aluminum, and the second metal member 113 is made of copper. In this way, a structure is formed in which the copper material encloses the aluminum material. As a result, the pole pole 011 can have a relatively large surface area of ​​copper, which contributes to ensuring the reliability of the connection between the pole pole 011 and the current collector, while the aluminum material can be protected by the copper material, which has superior strength and durability compared to aluminum, thus reducing the risk of damage to the pole pole 011.

[0058] Referring to Figure 8, correspondingly, the embodiment of the present application further provides a cover plate assembly 002. The cover plate assembly 002 includes a cover plate 021, a terminal 012, an upper resin member 022, a lower resin member 023, a current collector member 024, a seal ring, and the aforementioned pole post 011. The cover plate 021 has mounting holes. The pole post 011 is mounted through the cover plate 021. The terminal 012 is located on one side of the cover plate 021 and is connected to the pole post 011. The upper resin member 022 is provided between the terminal 012 and the cover plate 021. The lower resin member 023 is provided on the other side of the cover plate 021. The current collector member 024 is connected to the end of the pole post 011 away from the terminal 012. The seal ring is provided between the pole post 011 and the mounting holes. Here, if the material of the first metal member 112 matches the material of the current collector 024, the first metal member 112 is connected to the current collector 024 and the terminal 012 is connected to the second metal member 113. Alternatively, if the material of the second metal member 113 matches the material of the current collector 024, the second metal member 113 is connected to the current collector 024 and the terminal 012 is connected to the first metal member 112.

[0059] To make it easier to understand, if the first metal member 112 is made of copper, the first metal member 112 is connected to one end of the current collector 024 and the terminal 012 is connected to the second metal member 113. If the second metal member 113 is made of copper, the second metal member 113 is connected to one end of the current collector 024 and the terminal 012 is connected to the first metal member 112.

[0060] In this embodiment, by employing pole post 011 according to several embodiments of the present application, the first metal member 112 and the second metal member 113 can be locked together in the axial direction of the pole post 011, effectively preventing detachment from the connection between the first metal member 112 and the second metal member 113, while ensuring the strength of the fitting structure between the first metal member 112 and the second metal member 113 is maintained, thereby improving the performance of the pole post 011, such as tensile resistance and vibration resistance. In this way, the reliability of the joint between the first metal member 112 and the second metal member 113 can be improved, thereby improving the reliability of the cover plate assembly 002.

[0061] Correspondingly, embodiments of the present invention further provide a battery cell comprising a case, an electrode assembly, and the aforementioned cover plate assembly 002. The case has a housing chamber. The electrode assembly is provided within the housing chamber. The cover plate 021 is connected to the case to close the opening of the housing chamber. The current collector 024 is also connected to the electrode assembly.

[0062] In this embodiment, by employing a cover assembly 002 according to several embodiments of the present application, the first metal member 112 and the second metal member 113 can be locked together in the axial direction of the pole column 011, effectively preventing detachment from the connection between the first metal member 112 and the second metal member 113. At the same time, the strength of the fitting structure between the first metal member 112 and the second metal member 113 can be ensured, thereby improving the performance of the pole column 011, such as tensile resistance and vibration resistance. In this way, the reliability of the joint between the first metal member 112 and the second metal member 113 can be improved, thereby improving the reliability of the battery cell.

[0063] The technical proposal and technical effects of the present application will be described in detail below with reference to specific examples. However, the following examples represent only a portion of the present application and do not specifically limit it.

[0064] This embodiment aims to investigate the effect of the depth dimension L1, to which the fitting block 1132 is fitted into the fitting groove 1121, on the tensile resistance performance of the pole column 011. To make it clear, the depth dimension to which the fitting block 1132 is fitted into the fitting groove 1121 is the same as the depth dimension of the fitting groove 1121.

[0065] The details of the test in the example are described below.

[0066] 1. Explanation regarding the examination (1) The simulation software used for the test is LSDYNA. (2) The first metal member 112 is made of aluminum and has an outer diameter of 20 mm. The second metal member 113 is made of copper and has a thickness D of 0.8 mm. (3) The height dimension H1 of the fitting block 1132 that is fitted into the fitting groove 1121 is 0.8 mm.

[0067] 2. Test Results Tensile tests were conducted on pole columns 011 with L1 set to 0.4D=0.32mm, 0.5D=0.4mm, D=0.8mm, and 2D=1.6mm, respectively. The tensile force values ​​at which pole column 011 breaks are as follows.

[0068] Table 1 shows the results of the tensile test on pole column 011.

[0069] [Table 1]

[0070] Here, the destruction of pole 011 mainly refers to the destruction of the first metal component 112.

[0071] As can be seen from Table 1, as the dimension L1 of the depth to which the fitting block 1132 is fitted into the fitting slot 1121 increases, the tensile force value at which the pole column 011 breaks gradually decreases. In other words, this means that the tensile resistance performance of the pole column 011 gradually decreases. If its tensile resistance performance is 36110N, the pole column 011 does not meet the strength requirements.

[0072] Therefore, in order to satisfy the fitting requirements between the first metal part 112 and the second metal part 113 while ensuring the tensile strength of the pole column 011, the depth dimension L1 into which the fitting block 1132 is fitted into the fitting slot 1121 should not exceed 0.5D.

[0073] While embodiments of the present application have been described in detail above, and specific examples have been used to illustrate the principles and embodiments of the present application, the above descriptions of embodiments are merely intended to aid in understanding the technical solution and core idea of ​​the present application. Furthermore, those skilled in the art can modify the forms for carrying out the invention and their scope of application based on the idea of ​​the present application. For these reasons, the contents of this specification should not be construed as limiting the present application. [Explanation of symbols]

[0074] 011 pole column, 112 first metal member, 1121 fitting groove, 1122 outer surface, 113 second metal member, 1131 connecting groove, 1132 fitting block, 1133 first surface, 1134 first fitting part, 1135 second fitting part, 1136 groove bottom, 1137 groove wall, 118 Step section, 012 terminal, 002 Cover plate assembly, 021 Cover plate, 022 Upper resin member, 023 Lower resin member, 024 Current collector member.

Claims

1. A first metal member having an outer surface with a fitting groove, A connecting groove is provided, one end of the first metal member is fitted into the connecting groove, a fitting block is provided protruding from the groove wall of the connecting groove toward the first metal member, and the fitting block is fitted into the fitting groove of the second metal member, Here, unlike the material of the first metal member and the material of the second metal member, the thickness of the groove wall of the connecting groove is D, and the depth to which the fitting block is fitted into the fitting groove is L1, satisfying 0 < L1 ≤ 0.5D. Polar pillar.

2. In the axial direction of the pole column, the fitting block has a height dimension H1 and satisfies D ≤ H1 ≤ 3D. The pole column according to claim 1.

3. The fitting block includes a first fitting portion and a second fitting portion, the first fitting portion extending radially inward from the side of the groove wall of the connecting groove near its opening, and the second fitting portion extending axially outward from the side of the first fitting portion away from the groove bottom of the connecting groove. The pole column according to claim 1.

4. The side wall of the second fitting portion that is away from the axis of the pole column is flush with the outer surface. The pole post according to claim 3.

5. In the axial direction of the pole column, the height dimension of the second fitting portion is H2, and the condition 0.5D ≤ H2 ≤ 2D is satisfied. The pole post according to claim 3.

6. The fitting groove extends along the circumference of the outer surface, and the fitting block extends along the circumference of the outer surface. The pole column according to any one of claims 1 to 4.

7. The fitting groove and the fitting block both extend in an annular shape along the circumference of the outer surface. The pole post according to claim 6.

8. Multiple fitting grooves are provided spaced apart along the circumference of the outer surface. Multiple fitting blocks are provided, The multiple fitting blocks correspond one-to-one with the multiple fitting grooves, The pole column according to any one of claims 1 to 4.

9. The thickness of the bottom of the connecting groove matches the thickness of the groove wall. The pole column according to any one of claims 1 to 4.

10. The first metal member is made of aluminum, and the second metal member is made of copper. The pole column according to any one of claims 1 to 4.

11. A cover plate having mounting holes, A pole post according to any one of claims 1 to 5, wherein the pole post is inserted through the mounting hole of the cover plate, A terminal located on one side of the cover plate and connected to the pole pole, An upper resin member provided between the terminal and the cover plate, A lower resin member provided on the other side of the cover plate, A current collector member connected to the end of the pole pole away from the terminal, A sealing ring provided between the pole column and the mounting hole, If the material of the first metal member matches the material of the current collector, the first metal member is connected to the current collector and the terminal is connected to the second metal member; or if the material of the second metal member matches the material of the current collector, the second metal member is connected to the current collector and the terminal is connected to the first metal member. Cover plate assembly.

12. Cases with containment chambers, An electrode assembly provided in the aforementioned containment chamber, A cover plate assembly according to claim 11, wherein the cover plate is connected to the case so as to close the opening of the housing chamber, and the current collector is further connected to the electrode assembly, Battery cell.

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