Electrode output member, cover plate assembly, and battery cell

Abstract

The present invention provides an electrode output member, a cover plate assembly, and a battery cell that can improve the connection reliability between the terminal and the electrode post. [Solution] The electrode output member comprises an electrode post 011 having a contact portion 111 on its outer circumferential surface, and a terminal 012 having a first through hole 121. The first through hole is fitted onto one end of the electrode post and contacts the contact portion along the axial direction of the electrode post, so that the contact portion 013 between the electrode post and the terminal interlocks with each other. In this invention, the terminal and the electrode post are locked together along the axial direction to form an interlocking structure at the contact portion between the electrode post and the terminal.

Description

Technical Field

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

Background Art

[0002] The electrode output member is an important component for connecting the inside and outside of a battery cell. The electrode output member includes a terminal and a pole post. One end of the pole post is connected to the terminal located outside the battery cell, and the other end is connected to the electrode assembly inside the battery cell. The terminal is locked to the cover plate of the battery cell to prevent the pole post from falling into the battery cell. Then, the terminal and the pole post are fixed by welding. Due to the influence of factors such as stress caused by welding, the connection reliability between the terminal and the pole post is poor. In particular, when an external force such as a pushing force or torque acts on the terminal, the connection part between the terminal and the pole post is damaged, and the connection reliability between the terminal and the pole post decreases. As a result, the current-carrying capacity between the terminal and the pole post decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Embodiments of this application provide an electrode output member, a cover plate assembly, and a battery cell that can improve the connection reliability between a terminal and a pole post.

Means for Solving the Problems

[0004] In a first aspect, embodiments of this application provide an electrode output member, which includes a pole post provided with a contact portion on its outer peripheral surface and a terminal having a first through hole. The first through hole is externally fitted to one end of the pole post and abuts against the contact portion along the axial direction of the pole post. Here, a structure in which the contact portions between the pole post and the terminal mesh with each other is formed.

[0005] In one embodiment, the pole post has a contact portion that contacts the terminal, and for some of the contact portions, the metal material thereof is different from the metal material of the terminal.

[0006] In one embodiment, the pole includes a connected first metal member and a second metal member, a terminal fitted onto the first metal member, a contact portion provided on the outer circumferential surface of the second metal member, and the metal material of the terminal is different from the metal material of the second metal member.

[0007] In one embodiment, a recess is provided in the second metal member, and the end of the first metal member away from the pressure-receiving end is fitted into the recess. The portion of the first metal member that fits with the terminal is the first outer surface, and the second metal member has a second outer surface, the second outer surface being located away from the bottom of the recess in the contact portion, and the first and second outer surfaces are located on the same axis.

[0008] In one embodiment, the terminal material is aluminum and the second metal member material is copper, or the terminal and the first metal member material is aluminum and the second metal member material is copper.

[0009] In one embodiment, the pole column includes a first segment and a second segment connected along the axial direction, wherein the outer diameter of the second segment is greater than the outer diameter of the first segment, the outer surface of the second segment is connected to the outer surface of the first segment via a first plane, the first plane is perpendicular to the axis of the pole column, and the first plane is a contact surface.

[0010] In one embodiment, the terminal is provided with a first through-hole through which a pole post is inserted, the pole post includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment is larger than the outer diameter of the first segment, the outer surface of the second segment is connected to the outer surface of the first segment via a first bevel, the end of the first bevel connected to the outer surface of the first segment is provided closer to the axis of the pole post than the end connected to the outer surface of the second segment, the first bevel is a contact portion, and a second bevel is provided on the side of the hole wall of the first through-hole closer to the contact portion, the first bevel is configured to interlock with the second bevel after the pole post is pressed in the axial direction.

[0011] In one embodiment, in the longitudinal cross-section of the electrode output member, the angle between the straight line on which the first inclined surface is located and the generatrix on which the outer surface of the second segment is located is denoted as α, satisfying the condition 110° ≤ α ≤ 160°.

[0012] In one embodiment, the terminal is provided with a first through-hole through which a pole post is inserted, the pole post includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment is larger than the outer diameter of the first segment, the outer surface of the second segment is connected to the outer surface of the first segment via a first arc surface, the end of the first arc surface connected to the outer surface of the first segment is provided closer to the axis of the pole post than the end connected to the outer surface of the second segment, the first arc surface is a contact portion, and a second arc surface is provided on the side of the hole wall of the first through-hole closer to the contact portion, the first arc surface is configured to interlock with the second arc surface after the pole post is pressed in the axial direction.

[0013] In one embodiment, the pole column includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment being larger than the outer diameter of the first segment, a stepped portion being provided at the connection point between the first segment and the second segment, a first through-hole being provided through which the pole column is inserted, a stepped groove being provided on the side of the hole wall of the first through-hole closest to the contact portion, and the stepped portion being configured to interlock with the groove wall of the stepped groove after the pole column is pressed in the axial direction.

[0014] In a second embodiment, the present invention provides a cover plate assembly comprising a cover plate, an upper resin member, a lower resin member, a current collector member, a seal ring, and the aforementioned electrode output member, wherein the cover plate has mounting holes, the poles are mounted through the mounting holes, the terminals are located on one side of the cover plate, the upper resin member is provided between the terminals and the cover plate, the lower resin member is provided on the other side of the cover plate, one end of the current collector member is connected to the end of the pole away from the terminals, and the seal ring is provided between the poles and the side wall of the mounting holes.

[0015] 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 other end of a current collector is connected to the electrode assembly. [Effects of the Invention]

[0016] In the embodiment of the present invention, by locking the terminal and the pole post along the axial direction, a structure that interlocks with each other is formed at the contact portion between the pole post and the terminal. This improves the connection strength between the pole post and the terminal, and consequently improves the reliability of the connection between the terminal and the pole post. [Brief explanation of the drawing]

[0017] To more clearly explain the technical concept in the embodiments of this application, the drawings necessary for describing the embodiments are briefly described below. Clearly, the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without any creative work.

[0018] [Figure 1] This is a schematic diagram of the structure of an electrode output member according to an embodiment of the present application. [Figure 2] This is a schematic diagram of the structure of the pole column according to an embodiment of the present invention. [Figure 3] This is a schematic diagram of the structure after the pole column according to the embodiment of the present application has been pressed in the axial direction, causing the portion of the pole column that contacts the terminal to deform toward the terminal. [Figure 4] This is a schematic diagram of the structure of a second embodiment of an electrode output member according to an embodiment of the present application. [Figure 5] This is a schematic diagram of the structure of an electrode output member according to a third embodiment of the present application. [Figure 6] This is a schematic diagram of the structure of the pole column according to the embodiment of the present invention. [Figure 7] This is a schematic diagram of the structure of an electrode output member according to a fourth embodiment of the present application. [Figure 8] It is a schematic diagram of the structure of the pole column of the electrode output member of the fourth form according to the embodiment of the present application. [Figure 9] It is a schematic diagram of the structure of the terminal of the electrode output member of the fourth form according to the embodiment of the present application. [Figure 10] It is an enlarged view at A in FIG. 8. [Figure 11] It is a schematic diagram of the structure of the electrode output member of the fifth form according to the embodiment of the present application. [Figure 12] It is a schematic diagram of the structure of the electrode output member of the sixth form according to the embodiment of the present application. [Figure 13] It is an enlarged view at B in FIG. 12. [Figure 14] It is a schematic diagram of the structure of the electrode output member of the seventh part according to the embodiment of the present application. [Figure 15] It is a schematic diagram of the structure of the cover plate assembly according to the embodiment of the present application.

Embodiments for Carrying out the Invention

[0019] 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, not all of the embodiments. Based on the embodiments in 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.

[0020] In the description of the present application, unless specifically defined and limited, the terms "attachment", "connection", and "connection" should be understood broadly. For example, it may be a fixed connection, a detachable connection, or an integrated connection, or a mechanical connection, an electrical connection, or mutual communication, or a direct connection, an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

[0021] Furthermore, the terms “includes,” “equipped with,” and any variations thereof are intended to cover non-exclusive inclusion. Thus, a process, method, article, or apparatus consisting of a set of elements includes not only these elements, but also other elements not explicitly stated, or elements specific to the process, method, article, or apparatus. Unless otherwise specified, an element limited by “equipped with” does not preclude other identical elements from being present in the process, method, article, or apparatus that includes that element.

[0022] In the description of embodiments of this Application, terms such as “as an example” or “for example” are used to indicate an example, description, or representation. Any embodiment or design described as “as an example” or “for example” in the embodiments of this Application shall not be construed as having more advantages than another embodiment or design. Terms such as “as an example” or “for example” are intended to clearly express relative concepts.

[0023] As shown in Figures 1 and 2, Figure 1 is a schematic diagram of the structure of an electrode output member 001 according to an embodiment of the present application, and Figure 2 is a schematic diagram of the structure of an electrode post 011 according to an embodiment of the present application. The embodiment of the present application provides an electrode output member 001. The electrode output member 001 comprises an electrode post 011 and a terminal 012. A contact portion 111 is provided on the outer circumferential surface of the electrode post 011. The terminal 012 has a first through hole 121. The first through hole 121 is fitted onto one end of the electrode post 011 and contacts the contact portion 111 along the axial direction of the electrode post 011. Here, the portion where the electrode post 011 and the terminal 012 contact is configured to deform after the electrode post 011 is pressed in the axial direction, forming a structure in which they interlock at the contact portion between the electrode post 011 and the terminal 012. The thick solid line shown in the enlarged view in Figure 1 represents the contact portion between the electrode post 011 and the terminal 012.

[0024] Here, terminal 012 is provided with a first through-hole 121 through which pole 011 is inserted.

[0025] It can be understood that the contact portion between the pole post 011 and the terminal 012 includes at least the contact portion between the pole post 011 and the hole wall of the first through hole 121, and the contact portion formed by the pole post 011 abutting against the terminal 012 along the axial direction.

[0026] To make it easier to understand, the outer diameter of the contact portion 111 is larger than the diameter of the first through hole 121 so that the terminal 012 can contact the contact portion 111. Therefore, the contact portion 111 may be a shoulder structure provided on the pole column 011, a collar structure provided on the pole column 011, or a bump provided on the outer circumferential surface of the pole column 011.

[0027] To make it easier to understand, before pressing the pole column 011 axially, the pole column 011 is fixed vertically to the support base of the press device, and the terminal 012 is fixed with a jig. Then, the punch of the press device applies pressure to the end of the pole column 011 that is away from the support base. With one end of the pole column 011 restricted by the support base and the other end pressed by the punch, the pole column 011 expands radially and deforms into the terminal 012. This allows the fitting gap between the pole column 011 and the terminal 012 to be filled with the radially expanded pole column 011. Also, in the process of the pole column 011 deforming toward the terminal 012, the terminal 012 is also pressed and deformed by the pole column 011. This creates an interlocking structure between the pole column 011 and the terminal 012, thereby achieving a tight fit between the pole column 011 and the terminal 012. After the pressing is complete, the reliability of the connection between the pole post 011 and the terminal 012 is improved by welding the pole post 011 and the terminal 012 at one or both ends of the first through hole 121.

[0028] Figure 3 is a schematic diagram of the structure after the pole column according to the embodiment of the present application has been pressed in the axial direction and the portion in contact with the terminal has been deformed toward the terminal. As shown in Figure 3, after the pressing is completed, a press groove 119 is formed on the end of the pole column 011 that has been pressed by the punch.

[0029] Furthermore, the interlocking structure between the pole 011 and the terminal 012 may be achieved by a single press, or by performing a preliminary press followed by a final press. For example, the pressure-receiving area of ​​a certain pole 011 is approximately 16.6 mm². 2 Therefore, it can be pressed using a 6-ton press, where the pressing time is less than 2 seconds.

[0030] To ensure clarity, in the enlarged view of Figure 1, the thick solid line indicates the position of the contact portion 013, not its structure. Specifically, by cutting the electrode output member 001 according to the embodiment of this application in a cross-section parallel to its axis, impregnating it with the corresponding reagent, and then immersing it in, for example, an acidic liquid, it can be confirmed that the joint pattern of the interlocking structure formed between the electrode column 011 and the terminal 012 is irregular. Irregularity here means that the joint pattern between them is not a straight line.

[0031] In this embodiment, the terminal 012 and the pole post 011 are locked together along the axial direction, and the portion where the pole post 011 and the terminal 012 contact each other is deformed toward the terminal 012 after the pole post 011 is pressed in the axial direction, thereby expanding the pole post 011 toward the terminal 012, filling the gap between it and the terminal 012, and forming a structure in which they interlock at the contact portion between the pole post 011 and the terminal 012. This improves the connection strength between the pole post 011 and the terminal 012, and improves the connection reliability between the terminal 012 and the pole post 011.

[0032] Furthermore, when an external force such as pressing force or torque is applied to terminal 012, the interlocking structure between the pole column 011 and terminal 012, in addition to the welded joint between them, can resist the external force. This improves the thrust resistance and torsional resistance of the electrode output member 001.

[0033] In one embodiment, the pole 011 has a contact portion that contacts the terminal 012, and the metal material of a part of the contact portion is different from the metal material of the terminal 012.

[0034] To understand this, different metal materials have different fluidity properties. Therefore, the fluidity of the metal material at some contact points differs from that of the metal material at terminal 012. Here, the fluidity of the metal material refers to its ability to fill surrounding gaps or spaces during the casting, forging, or pressing process.

[0035] In this way, when the pole column 011 is pressed in the axial direction and the contact portion deforms toward the terminal 012, the flow velocity when a part of the contact portion of the pole column 011 deforms is different from the flow velocity when the terminal 012 is pressed by the pole column 011 and deforms. As a result, a more interlocking structure with more irregularities can be formed between the deformed portion of the pole column 011 and the terminal 012, and the connection strength between the pole column 011 and the terminal 012 can be improved, thereby improving the connection reliability between the terminal 012 and the pole column 011.

[0036] Furthermore, as can be understood, different metal materials have different coefficients of thermal expansion when subjected to heat. Thus, by bringing a material with a high coefficient of expansion into contact with a material with a low coefficient of expansion, or by having a material with a low coefficient of expansion cover a material with a high coefficient of expansion, the connection strength between the pole 011 and the terminal 012 can be improved.

[0037] Referring to Figure 4, Figure 4 is a schematic diagram of the structure of a second embodiment of an electrode output member 001 according to an embodiment of the present application. In one embodiment, the pole column 011 includes a connected first metal member 112 and a second metal member 113. The terminal 012 is fitted onto the first metal member 112. The contact portion 111 is provided on the outer circumferential surface of the second metal member 113. The metal material of the terminal 012 is different from the metal material of the second metal member 113. In this way, by providing the pole column 011 with a contact portion having a different flow coefficient than the terminal 012, the reliability of the connection between the pole column 011 and the terminal 012 is improved, and because the pole column 011 is made of two types of metal members, the first metal member 112 can be made of a lighter and less expensive metal member, thereby reducing the weight and material cost of the battery cell.

[0038] Referring to Figure 5, Figure 5 is a schematic diagram of the structure of a third embodiment of the electrode output member 001 according to an embodiment of the present application. In one embodiment, a recess 1131 is provided in the second metal member 113. The end of the first metal member 112 away from the pressure-receiving end is fitted into the recess 1131. The portion of the first metal member 112 that fits with the terminal 012 is the first outer peripheral surface. The second metal member 113 has a second outer peripheral surface, which is located on the side of the contact portion 111 away from the bottom of the recess 1131, and the first outer peripheral surface and the second outer peripheral surface are provided on the same axis.

[0039] As can be understood, the material of the first metal member 112 is different from the material of the second metal member 113, making the joining of the two metal members difficult. Based on this, in this embodiment, by providing the recess 1131, the joining area between the first metal member 112 and the second metal member 113 can be increased, thereby improving the reliability of the connection between them.

[0040] Furthermore, by arranging the first outer surface and the second outer surface on the same axis, a portion of the hole wall of the first through hole 121 is brought into contact with the first outer surface, and another portion is brought into contact with the second outer surface. In this way, when the pole column 011 is pressed in the axial direction, the pole column 011 and the terminal 012 form a joint surface of the first metal member-second metal member-terminal that is interlocked at the contact portion, thereby improving the reliability of the structure of the electrode output member.

[0041] In one embodiment, the material of terminal 012 is aluminum and the material of the second metal member 113 is copper, or the materials of terminal 012 and the first metal member 112 are aluminum and the material of the second metal member 113 is copper. In this way, an interlocked aluminum (first metal member)-copper (second metal member)-copper (terminal) joint surface can be formed at the contact portion between pole 011 and terminal 012.

[0042] As can be understood, terminals 012 and the first metal member 112 are made of aluminum, compared to copper, thus reducing their weight and material costs. Furthermore, within the battery cell, the material of the negative electrode current collector and the negative electrode sheet current collector is the same, which is copper. Therefore, with the above configuration, the second metal member 113 is connected to the current collector. In this way, compared to an electrode post 011 made entirely of copper, the conductivity of the electrode post 011 is guaranteed, and the weight and material costs of the electrode post 011 can be reduced.

[0043] Furthermore, because copper and aluminum have different melting points, welding the connection surface between them is difficult, and intermediate compounds are easily formed between copper and aluminum during welding, which is unfavorable for joining copper and aluminum. Therefore, the pole column 011 can be formed using an upset forming process to ensure a secure joint between the first metal member 112 and the second metal member, while also avoiding the formation of intermediate compounds due to welding.

[0044] Referring to Figure 6, in one embodiment, the terminal 011 includes a first segment 114 and a second segment 115 connected along the axial direction. The outer diameter of the second segment 115 is larger than the outer diameter of the first segment 114. The outer circumferential surface of the second segment 115 is connected to the outer circumferential surface of the first segment 114 via a first plane 116. The first plane 116 is perpendicular to the axis of the pole column 011, and the first plane 116 is the contact portion 111. In this way, the structure of the pole column 011 can be simplified, manufacturing can be facilitated, and manufacturing costs can be reduced.

[0045] Here, referring to the embodiment described above, if the pole column 011 includes a first metal member 112 and a second metal member 113, the first segment 114 is the side of the first metal member 112 away from the second metal member 113. The second segment 115 is the portion of the second metal member 113 and the first metal member 112 inserted into the second metal member 113.

[0046] In addition to the structure shown in Figure 6, embodiments of the present application also provide the structure of the electrode output member 001 shown in Figure 7. Referring to Figures 7 to 9, Figure 7 is a schematic diagram of the structure of the electrode output member 001 of the fourth embodiment according to the present application, Figure 8 is a schematic diagram of the structure of the pole column 011 of the electrode output member 001 of the fourth embodiment according to the present application, and Figure 9 is a schematic diagram of the structure of the terminal 012 of the electrode output member 001 of the fourth embodiment according to the present application. In one embodiment, the terminal 012 is provided with a first through hole 121 through which the pole column 011 is inserted, and the pole column 011 includes a first segment 114 and a second segment 115 connected along the axial direction. The outer diameter of the second segment 115 is larger than the outer diameter of the first segment 114. The outer surface of the second segment 115 is connected to the outer surface of the first segment 114 via the first inclined surface 117, and the end of the first inclined surface 117 connected to the outer surface of the first segment 114 is positioned closer to the axis of the pole column 011 than the end connected to the outer surface of the second segment 115. The first inclined surface 117 is a contact portion 111. A second inclined surface 122 is provided on the side of the hole wall of the first through hole 121 that is closer to the contact portion 111, and the first inclined surface 117 is configured to interlock with the second inclined surface 122 after the pole column 011 is pressed in the axial direction.

[0047] Here, referring to the embodiment described above, if the pole column 011 includes a first metal member 112 and a second metal member 113, the first segment 114 is the side of the first metal member 112 away from the second metal member 113. The second segment 115 is the portion of the second metal member 113 and the first metal member 112 inserted into the second metal member 113. The first inclined surface 117 is provided on the second metal member 113.

[0048] In this embodiment, by making the first inclined surface 117 and the second inclined surface 122 the contact portion 111 between the pole column 011 and the terminal 012, stress between related parts can be relieved and stress concentration can be avoided, and the area of ​​the contact surface between the pole column 011 and the terminal 012 can be increased by a certain height and radial dimension, thereby improving the reliability of the fit between the pole column 011 and the terminal 012.

[0049] Referring to Figure 10, which is an enlarged view of A in Figure 8. In one embodiment, in the longitudinal section of the electrode output member 001, the angle between the straight line on which the first inclined surface 117 is located and the generatrix on which the outer circumferential surface of the second segment 115 is located is α, satisfying 110° ≤ α ≤ 160°.

[0050] To make it clear, the included angle α includes, but is not limited to, 110°, 115°, 118°, 120°, 126°, 129°, 130°, 132°, 135°, 140°, 142°, 147°, 150°, 155°, 158°, and 160°.

[0051] In this embodiment, the above limitations allow for an appropriate contact angle between the pole 011 and the terminal 012, thereby improving the reliability of contact between the pole 011 and the terminal 012.

[0052] Furthermore, when the metal material of the contact area and the metal material of the terminal 012 are different, limiting the clamping angle α is advantageous in ensuring the material fluidity of the contact area between the terminal 012 and the pole column 011, thereby forming an interlock structure where materials with different fluidities interlock with each other.

[0053] Accordingly, when the pole column 011 is formed by combining the first metal member 112 and the second metal member 113, the structure of the electrode output member 001 when the first inclined surface 117 is provided thereon is as shown in Figure 11, where Figure 11 is a schematic diagram of the structure of the electrode output member 001 of the fifth embodiment according to the present invention.

[0054] Apart from the structure of the electrode output member 001 according to the above embodiment, the present invention provides the structure of the electrode output member 001 in the following embodiment. In one embodiment, the terminal 012 is provided with a first through hole 121 through which a pole column 011 is passed, and the pole column 011 includes a first segment 114 and a second segment 115 connected along the axial direction. The outer diameter of the second segment 115 is larger than the outer diameter of the first segment 114. The outer circumferential surface of the second segment 115 is connected to the outer circumferential surface of the first segment 114 via a first arc surface. The end of the first arc surface connected to the outer circumferential surface of the first segment 114 is positioned closer to the axis of the pole column 011 than the end connected to the outer circumferential surface of the second segment 115, the first arc surface is a contact portion 111, and a second arc surface is provided on the side of the hole wall of the first through hole 121 closer to the contact portion 111, and the first arc surface is configured to interlock with the second arc surface after the pole column 011 is pressed in the axial direction.

[0055] To make it easier to understand, the first arc surface may be an arc-shaped surface that protrudes outward from the surface of the pole column 011, and correspondingly, the second arc surface is an arc-shaped surface that is recessed inward from the surface of the terminal 012. Accordingly, the first arc surface may be an arc-shaped surface that is recessed inward from the surface of the pole column 011, and correspondingly, the second arc surface is an arc-shaped surface that protrudes outward from the surface of the terminal 012.

[0056] Here, referring to the embodiment described above, if the pole column 011 includes a first metal member 112 and a second metal member 113, the first segment 114 is the side of the first metal member 112 away from the second metal member 113. The second segment 115 is the portion of the second metal member 113 and the first metal member 112 that is inserted into the second metal member 113. The first arc surface is provided on the second metal member 113.

[0057] In this embodiment, by making the second and first arc surfaces the contact portion 111 between the pole post 011 and the terminal 012, the area of ​​the contact surface between the pole post 011 and the terminal 012 can be increased with a constant height and radial dimension, thereby improving the reliability of the fit between the pole post 011 and the terminal 012.

[0058] In addition to the structure of the electrode output member 001 according to the above-described embodiment, the present invention also provides the structure of the electrode output member 001 shown in Figure 12. Referring to Figures 12 and 13, Figure 12 is a schematic diagram of the structure of the sixth embodiment of the electrode output member 001 according to the present invention, and Figure 13 is an enlarged view of B in Figure 12. In one embodiment, the pole column 011 includes a first segment 114 and a second segment 115 connected along the axial direction, the outer diameter of the second segment 115 being larger than the outer diameter of the first segment 114, and a stepped portion 118 provided at the connection point between the first segment 114 and the second segment 115, a stepped groove 123 provided on the hole wall of the first through hole 121 on the side closer to the contact portion 111, and the stepped portion 118 is configured to interlock with the groove wall of the stepped groove 123 after the pole column 011 is pressed in the axial direction.

[0059] Here, referring to the embodiment described above, if the pole column 011 includes a first metal member 112 and a second metal member 113, the first segment 114 is the side of the first metal member 112 away from the second metal member 113. The second segment 115 is the portion of the second metal member 113 and the first metal member 112 inserted into the second metal member 113. The stepped portion 118 is provided on the second metal member 113.

[0060] In contrast to the structure shown in Figure 6, where the outer surface of the second segment 115 is connected to the outer surface of the first segment 114 via the first plane 116, in this embodiment, the connection point between the first segment 114 and the second segment 115 is provided to protrude outward, forming a stepped portion 118.

[0061] In this embodiment, by making the stepped groove 123 and the stepped portion 118 the contact portion 111 between the pole post 011 and the terminal 012, the positioning accuracy between the pole post 011 and the terminal 012 can be improved, thereby improving the reliability of the mating between the pole post 011 and the terminal 012.

[0062] In response to this, when the pole column 011 is formed by a combination of a first metal member 112 and a second metal member 113, the structure of the electrode output member 001 provided with the stepped portion 118 is shown in Figure 14, which is a schematic diagram of the structure of the electrode output member 001 of the seventh embodiment according to the present invention.

[0063] Referring to Figure 15, which is a schematic diagram of the structure of a cover plate assembly 002 according to one embodiment of the present application, the present embodiment provides a cover plate assembly 002. The cover plate assembly 002 comprises a cover plate 021, an upper resin member 022, a lower resin member 023, a current collector member 024, a seal ring, and the aforementioned electrode output member 001. The cover plate 021 has a mounting hole. The pole post 011 is inserted through the mounting hole. The terminal 012 is located on one side of the cover plate. 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, and one end of 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 side wall of the mounting hole.

[0064] In this embodiment, by employing the aforementioned electrode output member 001, the pole column 011 expands toward the terminal 012, filling the gap for fitting between it and the terminal 012. Simultaneously, during the process of the pole column 011 deforming toward the terminal 012, the terminal 012 is pressed and deformed by the pole column 011, forming a structure in which they interlock at the contact portion between them. In this way, the connection strength between the pole column 011 and the terminal 012 is improved, the connection reliability between the terminal 012 and the pole column 011 is improved, and the reliability of the cover plate assembly 002 is further improved.

[0065] Accordingly, embodiments of the present invention also provide a battery cell. The battery cell comprises a case, an electrode assembly, and the aforementioned cover plate assembly 002. The case has a housing chamber, and 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, and the other end of the current collector member 024 is connected to the electrode assembly.

[0066] In this embodiment, by employing the aforementioned cover plate assembly 002, the pole post 011 expands toward the terminal 012, filling the gap for fitting between it and the terminal 012. Simultaneously, during the process of the pole post 011 deforming toward the terminal 012, the terminal 012 is pressed and deformed by the pole post 011, forming a structure in which they interlock at the contact portion between them. In this way, the connection strength between the pole post 011 and the terminal 012 is improved, the connection reliability between the terminal 012 and the pole post 011 is improved, and the reliability of the battery cell can be further improved.

[0067] 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]

[0068] 1001 Electrode output member, 011 pole column, 111 contact portion, 112 first metal member, 113 second metal member, 1131 recess, 114 first segment, 115 second segment, 116 first plane, 117 first slope, 118 stepped portion, 119 press groove, 012 terminal, 121 first through hole, 122 second slope, 123 step groove, 013 Contact area, 002 Cover plate assembly, 021 Cover plate, 022 Upper resin member, 023 Lower resin member, 024 Current collector member.

Claims

1. The outer surface has a pole column with a contact portion, The pole column is fitted to one end of the pole column and has a terminal that contacts the contact portion along the axial direction of the pole column, The contact portion between the pole and the terminal forms a structure in which they interlock. Electrode output component.

2. The pole has a contact portion that contacts the terminal, and some of the contact portions have a metal material that is different from the metal material of the terminal. The output member of the electrode according to claim 1.

3. The pole includes a connected first metal member and a second metal member, the terminal is fitted into the first metal member, the contact portion is provided on the outer circumferential surface of the second metal member, and the metal material of the terminal is different from the metal material of the second metal member. The electrode output member according to claim 2.

4. The second metal member is provided with a recess, one end of the first metal member is fitted into the recess, the portion of the first metal member that fits with the terminal is the first outer surface, the second metal member has a second outer surface located away from the bottom of the recess of the contact portion, and the second outer surface is provided on the same axis as the first outer surface. The electrode output member according to claim 3.

5. The material of the terminal is aluminum, and the material of the second metal member is copper, or the materials of the terminal and the first metal member are aluminum, and the material of the second metal member is copper. The electrode output member according to claim 3.

6. The pole column includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment being larger than the outer diameter of the first segment, the outer surface of the second segment being connected to the outer surface of the first segment via a first plane, the first plane being perpendicular to the axis of the pole column, and the first plane being the contact portion. The electrode output member according to any one of claims 1 to 5.

7. The terminal is provided with a first through-hole through which the pole column is inserted, the pole column includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment is larger than the outer diameter of the first segment, the outer surface of the second segment is connected to the outer surface of the first segment via a first bevel, the end of the first bevel connected to the outer surface of the first segment is provided closer to the axis of the pole column than the end connected to the outer surface of the second segment, the first bevel is the contact portion, and a second bevel is provided on the side of the hole wall of the first through-hole closer to the contact portion, the first bevel is configured to interlock with the second bevel after the pole column is pressed in the axial direction. The electrode output member according to any one of claims 1 to 5.

8. In the longitudinal section of the electrode output member, let α be the angle between the straight line on which the first slope is located and the generatrix on which the outer surface of the second segment is located, satisfying 110° ≤ α ≤ 160°. The electrode output member according to claim 7.

9. The terminal is provided with a first through-hole through which the pole column is inserted, the pole column includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment is larger than the outer diameter of the first segment, the outer surface of the second segment is connected to the outer surface of the first segment via a first arc surface, the end of the first arc surface connected to the outer surface of the first segment is provided closer to the axis of the pole column than the end of the first segment connected to the outer surface of the second segment, the first arc surface is the contact portion, a second arc surface is provided on the side of the hole wall of the first through-hole closer to the contact portion, and the first arc surface is configured to interlock with the second arc surface after the pole column is pressed in the axial direction. The electrode output member according to any one of claims 1 to 5.

10. The pole column includes a first segment and a second segment connected along the axial direction, the outer diameter of the second segment being larger than the outer diameter of the first segment, and a stepped portion being provided at the connection point between the first segment and the second segment. The terminal is provided with a first through-hole through which the pole post is inserted, and a stepped groove is provided on the side of the hole wall of the first through-hole closest to the contact portion, and the stepped portion is configured to interlock with the groove wall of the stepped groove after the pole post is pressed in the axial direction. The electrode output member according to any one of claims 1 to 5.

11. A cover plate having mounting holes, An electrode output member according to any one of claims 1 to 5, wherein the electrode post is inserted through the mounting hole and the terminal is located on one side of the cover plate, 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, one end of which is connected to the end of the pole pole away from the terminal, A sealing ring provided between the pole column and the side wall of the mounting hole is included. 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, comprising: a cover plate assembly in which the cover plate is connected to the case so as to close the opening of the housing chamber, and the other end of the current collector is connected to the electrode assembly, Battery cell.

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