Electrode output piece, cover plate assembly and battery monomer

Abstract

The utility model provides an electrode output piece, a cover plate assembly and a battery monomer, and relates to the technical field of batteries. The electrode output piece comprises a pole and a terminal; an abutting part is arranged on the peripheral surface of the pole; the terminal is provided with a first through hole, and the first through hole is arranged at one end of the pole in a sleeving mode and abuts against the abutting part in the axial direction of the pole; and the contact parts between the pole and the terminal are mutually engaged. According to the invention, the terminal and the pole are in stopping fit along the axial direction, so that a mutually engaged structure is formed at the contact part between the pole and the terminal. Therefore, the connection strength between the pole and the terminal can be improved, and the connection reliability between the terminal and the pole can be further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to an electrode output piece, a cover plate assembly and a battery cell. BACKGROUND

[0002] The electrode output piece is an important component for connecting the inside and outside of the battery cell. The electrode output piece includes a terminal and a post. One end of the 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 in stopper cooperation with the cover plate of the battery cell to prevent the post from falling into the inside of the battery cell. The terminal and the post are welded and fixed. Due to the influence of welding stress and other factors, the connection reliability between the terminal and the post is poor. Especially when the terminal is subjected to external forces such as thrust or torque, the connection part between the terminal and the post will be damaged, which reduces the connection reliability between the terminal and the post. As a result, the overcurrent capacity between the terminal and the post is reduced. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide an electrode output piece, a cover plate assembly and a battery cell, which can improve the connection reliability between the terminal and the post.

[0004] In a first aspect, embodiments of the present application provide an electrode output piece, which includes a post and a terminal. The outer circumferential surface of the post is provided with an abutting portion. The terminal has a first through hole, which is sleeved on one end of the post and abuts against the abutting portion along the axial direction of the post. The contact part between the post and the terminal forms a structure of mutual engagement.

[0005] In an embodiment, the post has a contact part in contact with the terminal, and the metal material of part of the contact part is different from the metal material of the terminal.

[0006] In an embodiment, the post includes a first metal piece and a second metal piece connected to each other. The terminal is sleeved on the first metal piece, and the abutting portion is provided on the outer circumferential surface of the second metal piece. The metal material of the terminal is different from the metal material of the second metal piece.

[0007] In an embodiment, the second metal piece is provided with a groove, and one end of the first metal piece away from the stressed end is fitted into the groove. The part of the first metal piece cooperating with the terminal is the first outer circumferential surface. The second metal piece has a second outer circumferential surface, which is located on the side of the abutting portion away from the groove bottom. The first outer circumferential surface and the second outer circumferential surface are coaxially arranged.

[0008] In an embodiment, the material of the terminal is aluminum material, and the material of the second metal piece is copper material, or the material of the terminal and the first metal piece is aluminum material, and the material of the second metal piece is copper material.

[0009] In an embodiment, the pole post comprises a first section and a second section connected in an axial direction, an outer diameter of the second section is larger than that of the first section, an outer peripheral surface of the second section is connected to an outer peripheral surface of the first section through a first plane, the first plane is perpendicular to an axis of the pole post, and the first plane is the abutting portion.

[0010] In an embodiment, the terminal is provided with a first through hole for the pole post to pass through, the pole post comprises a first section and a second section connected in an axial direction, an outer diameter of the second section is larger than that of the first section, an outer peripheral surface of the second section is connected to an outer peripheral surface of the first section through a first inclined surface, one end of the first inclined surface connected to the outer peripheral surface of the first section is arranged closer to the axis of the pole post than the other end connected to the outer peripheral surface of the second section, the first inclined surface is the abutting portion, a second inclined surface is arranged on a side of a hole wall of the first through hole close to the abutting portion, and the first inclined surface is configured to engage with the second inclined surface after the pole post is axially pressed.

[0011] In an embodiment, in a longitudinal section of the electrode output, an included angle between a straight line where the first inclined surface is located and a generatrix where the outer peripheral surface of the second section is located is α, and 110°≤α≤160° is satisfied.

[0012] In an embodiment, the terminal is provided with a first through hole for the pole post to pass through, the pole post comprises a first section and a second section connected in an axial direction, an outer diameter of the second section is larger than that of the first section, an outer peripheral surface of the second section is connected to an outer peripheral surface of the first section through a first arc surface, one end of the first arc surface connected to the outer peripheral surface of the first section is arranged closer to the axis of the pole post than the other end connected to the outer peripheral surface of the second section, the first arc surface is the abutting portion, a second arc surface is arranged on a side of a hole wall of the first through hole close to the abutting portion, and the first arc surface is configured to engage with the second arc surface after the pole post is axially pressed.

[0013] In an embodiment, the pole post comprises a first section and a second section connected in an axial direction, an outer diameter of the second section is larger than that of the first section, and a step is arranged at a connection between the first section and the second section, a step groove is arranged on a side of a hole wall of the first through hole close to the abutting portion, and the step is configured to engage with a groove wall of the step groove after the pole post is axially pressed.

[0014] In a second aspect, an embodiment of the present application provides a cover plate assembly, which comprises a cover plate, an upper plastic part, a lower plastic part, a current collecting part, a sealing ring, and the aforementioned electrode output; the cover plate has a mounting hole; the pole post passes through the mounting hole, and the terminal is located on one side of the cover plate; the upper plastic part is arranged between the terminal and the cover plate; the lower plastic part is arranged on the other side of the cover plate; one end of the current collecting part is connected to an end of the pole post away from the terminal; and the sealing ring is arranged between the pole post and a side wall of the mounting hole.

[0015] In a third aspect, the embodiments of the present application provide a battery cell, comprising 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 an opening of the receiving cavity, and the other end of the current collector is connected with the electrode assembly.

[0016] The embodiments of the present application have the following beneficial effects:

[0017] In the embodiments of the present application, the terminal and the pole are axially stop-fitted, and a mutual engagement structure is formed at the contact position between the pole and the terminal. In this way, the connection strength between the pole and the terminal can be improved, and the connection reliability between the terminal and the pole can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment 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 creative effort.

[0019] Figure 1 is a structural schematic diagram of a first electrode output provided by the embodiments of the present application;

[0020] Figure 2 is a structural schematic diagram of a pole provided by the embodiments of the present application;

[0021] Figure 3 is a structural schematic diagram of the pole after the pole is axially pressed to make the contact position between the pole and the terminal deformed towards the terminal;

[0022] Figure 4 is a structural schematic diagram of a second electrode output provided by the embodiments of the present application;

[0023] Figure 5 is a structural schematic diagram of a third electrode output provided by the embodiments of the present application;

[0024] Figure 6 is a structural schematic diagram of a pole provided by the embodiments of the present application;

[0025] Figure 7 is a structural schematic diagram of a fourth electrode output provided by the embodiments of the present application;

[0026] Figure 8 is a structural schematic diagram of a pole of the fourth electrode output provided by the embodiments of the present application;

[0027] Figure 9is a structural schematic view of a terminal of a fourth electrode output piece provided by an embodiment of the present application;

[0028] Figure 10 is Figure 8 is an enlarged view of A in FIG. 1;

[0029] Figure 11 is a structural schematic view of a fifth electrode output piece provided by an embodiment of the present application;

[0030] Figure 12 is a structural schematic view of a sixth electrode output piece provided by an embodiment of the present application;

[0031] Figure 13 is Figure 12 is an enlarged view of B in FIG. 2;

[0032] Figure 14 is a structural schematic view of a seventh electrode output piece provided by an embodiment of the present application;

[0033] Figure 15 is a structural schematic view of a cover plate assembly provided by an embodiment of the present application.

[0034] Legend of reference signs:

[0035] 001 - electrode output piece;

[0036] 011 - pole; 111 - abutting portion; 112 - first metal piece; 113 - second metal piece; 1131 - recess; 114 - first section; 115 - second section; 116 - first plane; 117 - first inclined surface; 118 - step; 119 - punching groove;

[0037] 012 - terminal; 121 - first through hole; 122 - second inclined surface; 123 - step groove;

[0038] 013 - contact portion;

[0039] 002 - cover plate assembly; 021 - cover plate; 022 - upper plastic piece; 023 - lower plastic piece; 024 - current collecting piece. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or apparatus including the element.

[0043] In the description of the embodiments of the present application, the words "example" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" are intended to present relative concepts in a clear manner.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural diagram of an electrode output piece 001 provided by an embodiment of the present application, Figure 2 An electrode output piece 001 is provided by an embodiment of the present application. The electrode output piece 001 includes a pole column 011 and a terminal 012. The pole column 011 is provided with an abutting portion 111 on the outer circumferential surface. The terminal 012 has a first through hole 121. The first through hole 121 is sleeved on one end of the pole column 011 and abuts against the abutting portion 111 along the axial direction of the pole column 011. Wherein, the part of the pole column 011 in contact with the terminal 012 is configured to deform after the pole column 011 is axially pressed, so as to form a mutual engagement structure at the contact part between the pole column 011 and the terminal 012, as shown in Figure 1 . Figure 1 The thick solid line shown in the enlarged view in

[0045] Wherein, the terminal 012 is provided with the first through hole 121 for the pole column 011 to pass through.

[0046] It can be understood that the contact part between the pole post 011 and the terminal 012 at least includes a contact part between the pole post 011 and the hole wall of the first through hole 121 and a contact part formed by the abutment of the pole post 011 and the terminal 012 in the axial direction.

[0047] It can be understood that the outer diameter of the abutment part 111 is greater than the hole diameter of the first through hole 121, so that the terminal 012 can abut against the abutment part 111. Therefore, the abutment part 111 can be a shoulder structure arranged on the pole post 011, or a collar structure arranged on the pole post 011, or a protruding point arranged on the outer circumferential surface of the pole post 011.

[0048] It can be understood that before the pole post 011 is axially pressed, the pole post 011 is vertically fixed on the support table of the stamping equipment, and the terminal 012 is fixed by a clamp. Then, the punch of the stamping equipment applies pressure to the end of the pole post 011 away from the support table. Since one end of the pole post 011 is limited by the support table and the other end is extruded by the punch, the pole post 011 expands radially to deform the terminal 012. In this way, the fitting gap between the pole post 011 and the terminal 012 can be filled by the radially expanded pole post 011. During the deformation of the pole post 011 to the terminal 012, the terminal 012 is also deformed by the extrusion of the pole post 011. In this way, the pole post 011 and the terminal 012 form a mutual engagement structure to achieve a close combination between the pole post 011 and the terminal 012. After stamping, the pole post 011 and the terminal 012 are welded at one end or both ends of the first through hole 121 to improve the reliability of the connection between the pole post 011 and the terminal 012.

[0049] After stamping, the end of the pole post 011 extruded by the punch forms a stamping groove 119, as shown in Figure 3 Figure 3 is a structure diagram of the pole post 011 after the contact part between the pole post 011 and the terminal 012 is deformed under the axial pressure of the pole post 011 provided by the embodiment of the present application.

[0050] In addition, the mutual engagement structure between the pole post 011 and the terminal 012 can be achieved by one-time stamping, or the mutual engagement structure can be achieved by first pre-pressing and then stamping. For example, the pressure area of a certain pole post 011 is about 16.6mm 2 , a 6-ton stamping equipment can be used for stamping, and the stamping time is not more than 2s.

[0051] It can be understood that Figure 1 ​The enlarged view in FIG. 1B schematically shows the position of the contact portion 013 as a thick solid line, but does not schematically show the structure of the contact portion 013. Specifically, when the electrode output member 001 provided by the embodiment of the present application is cut along a cross section parallel to the axis thereof, and the resulting cut surface is subjected to a reagent attack, for example, soaking in an acidic liquid, it can be seen that the joint lines of the interlocking structure between the pole post 011 and the terminal 012 are irregular. Here, irregular means that the joint lines therebetween are not straight lines.

[0052] In the embodiment, the pole post 011 is expanded toward the terminal 012 to fill the gap therebetween, and the interlocking structure is formed at the contact portion between the pole post 011 and the terminal 012, by axially abutting the terminal 012 against the pole post 011, and deforming the contact portion of the pole post 011 toward the terminal 012 upon axial compression of the pole post 011. Thus, the connection strength between the pole post 011 and the terminal 012 can be improved, and the connection reliability between the terminal 012 and the pole post 011 can be improved.

[0053] In addition, when the terminal 012 is subjected to an external force such as a pushing force or a torsional force, the interlocking structure between the pole post 011 and the terminal 012 can resist the external force in addition to the welded portion therebetween. Thus, the pushing resistance and the torsional resistance of the electrode output member 001 can be improved.

[0054] In one embodiment, the pole post 011 has a contact portion that contacts the terminal 012, and the metal material of the contact portion is different from the metal material of the terminal 012.

[0055] It can be understood that when the metal materials are different, the flowabilities of the corresponding metal materials are also different. Therefore, the flowability of the metal material of the contact portion is different from the flowability of the metal material of the terminal 012. Here, the flowability of the metal material refers to the ability of the metal material to fill the surrounding gaps or spaces during casting or forging or stamping.

[0056] Thus, when the contact portion of the pole post 011 is deformed toward the terminal 012 upon axial compression of the pole post 011, the flow speed of the contact portion of the pole post 011 during deformation is different from the flow speed of the terminal 012 during deformation due to extrusion by the pole post 011, and thus more irregular interlocking structures can be formed between the deformed portions of the pole post 011 and the terminal 012, and the connection strength between the pole post 011 and the terminal 012 can be improved, and the connection reliability between the terminal 012 and the pole post 011 can be improved.

[0057] In addition, it can be understood that different metal materials have different thermal expansion coefficients. Thus, the material with a larger expansion coefficient can tightly press the material with a smaller expansion coefficient, or the material with a smaller expansion coefficient can tightly wrap the material with a larger expansion coefficient, so as to improve the connection strength between the pole 011 and the terminal 012.

[0058] Referring to Figure 4 , Figure 4 is a structural schematic diagram of a second electrode output piece 001 provided by an embodiment of the present application. In an embodiment, the pole 011 includes a first metal piece 112 and a second metal piece 113 connected to each other. The terminal 012 is sleeved on the first metal piece 112. The abutting portion 111 is arranged on the outer circumferential surface of the second metal piece 113. The metal material of the terminal 012 is different from the metal material of the second metal piece 113. Thus, the pole 011 has a contact portion with a different flow coefficient from the terminal 012, so as to improve the reliability of the connection between the pole 011 and the terminal 012, and the pole 011 is composed of two metal pieces, so that the first metal piece 112 can be set as a metal with a lighter weight and a lower price, so as to control the weight and material cost of the battery monomer.

[0059] Referring to Figure 5 , Figure 5 is a structural schematic diagram of a third electrode output piece 001 provided by an embodiment of the present application. In an embodiment, the second metal piece 113 is provided with a groove 1131. The first metal piece 112 is embedded in the groove 1131 away from one end of the pressure receiving end. The part of the first metal piece 112 matched with the terminal 012 is a first outer circumferential surface. The second metal piece 113 has a second outer circumferential surface, and the second outer circumferential surface is located on the side of the abutting portion 111 away from the groove bottom of the groove 1131, and the first outer circumferential surface and the second outer circumferential surface are coaxially arranged.

[0060] It can be understood that the material of the first metal piece 112 is different from the material of the second metal piece 113, so that the combination is difficult. Based on this, in the present embodiment, by arranging the groove 1131, the matching surface of the first metal piece 112 and the second metal piece 113 can be increased, so as to improve the reliability of the connection therebetween.

[0061] In addition, by coaxially arranging the first outer circumferential surface and the second outer circumferential surface, a part of the hole wall of the first through hole 121 is in contact with the first outer circumferential surface, and another part is in contact with the second outer circumferential surface. Thus, when the pole 011 is axially extruded, the pole 011 and the terminal 012 form an interlocked first metal piece-second metal piece-terminal combination surface at the abutting portion, so as to improve the structural reliability of the electrode output piece.

[0062] In an embodiment, the terminal 012 is made of aluminum, and the second metal piece 113 is made of copper, or the terminal 012 and the first metal piece 112 are made of aluminum, and the second metal piece 113 is made of copper. In this way, the aluminum (first metal piece)-copper (second metal piece)-copper (terminal) combined surface can be formed at the abutting portion of the pole 011 and the terminal 012.

[0063] It can be understood that, compared with copper, the terminal 012 and the first metal piece 112 are made of aluminum, which can control the weight and the material cost. In addition, in the battery monomer, the current collector of the negative electrode current collector and the negative electrode sheet is made of copper. Therefore, by the above arrangement, the second metal piece 113 is connected with the current collector. In this way, compared with the all-copper pole 011, the conductivity of the pole 011 can be ensured, and the weight and the material cost of the pole 011 can be controlled.

[0064] In addition, since the melting points of copper and aluminum are different, the connection surface between them is difficult to weld, and when welding, an intermediate compound is easily formed between copper and aluminum, which is not conducive to the combination of copper and aluminum. Therefore, the pole 011 can be formed by a punch forming process, so that the first metal piece 112 and the second metal piece are reliably combined, and the formation of an intermediate compound due to welding can be avoided.

[0065] Please refer to Figure 6 In an embodiment, the pole 011 includes a first segment 114 and a second segment 115 connected in the axial direction. The outer diameter of the second segment 115 is greater than the outer diameter of the first segment 114. The outer peripheral surface of the second segment 115 is connected with the outer peripheral surface of the first segment 114 through a first plane 116. The first plane 116 is perpendicular to the axis of the pole 011, and the first plane 116 is the abutting portion 111. In this way, the pole 011 can have a simple structure and be easy to manufacture, so that the manufacturing cost can be controlled.

[0066] In combination with the foregoing embodiments, when the pole 011 includes the first metal piece 112 and the second metal piece 113, the first segment 114 is the side of the first metal piece 112 away from the second metal piece 113. The second segment 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113.

[0067] In addition to the structure shown in Figure 6 , the embodiments of the present application also provide the structure of the electrode output 001. Figure 7 Please refer to Figure 7- Figure 9 , Figure 7 is a fourth structure schematic diagram of the electrode output 001 provided by the embodiments of the present application, Figure 8 is a structure schematic diagram of the pole 011 of the fourth electrode output 001, Figure 9is a structural schematic view of the terminal 012 of the fourth electrode output piece 001 provided by the embodiments of the present application. In an embodiment, the terminal 012 is provided with a first through hole 121 for the pole 011 to pass through, and the pole 011 includes a first segment 114 and a second segment 115 connected in an axial direction. The outer diameter of the second segment 115 is greater than that 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 through a first inclined surface 117, and the end of the first inclined surface 117 connected to the outer circumferential surface of the first segment 114 is closer to the axis of the pole 011 than the end connected to the outer circumferential surface of the second segment 115. The first inclined surface 117 is an abutting portion 111. The hole wall of the first through hole 121 is provided with a second inclined surface 122 close to the side of the abutting portion 111, and the first inclined surface 117 is configured to be engaged with the second inclined surface 122 after the pole 011 is axially pressed.

[0068] In combination with the foregoing embodiments, when the pole 011 includes a first metal piece 112 and a second metal piece 113, the first segment 114 is the side of the first metal piece 112 away from the second metal piece 113. The second segment 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113. The first inclined surface 117 is arranged on the second metal piece 113.

[0069] In the present embodiment, by arranging the first inclined surface 117 and the second inclined surface 122 as the abutting portion 111 between the pole 011 and the terminal 012, the stress between the relevant parts can be improved to avoid stress concentration, and the area of the abutting surface between the pole 011 and the terminal 012 can be increased at a certain height and radial dimension, thereby improving the cooperation reliability between the pole 011 and the terminal 012.

[0070] Please refer to Figure 10 , Figure 10 is Figure 8 is an enlarged view of A in FIG. 11. In an embodiment, in the longitudinal cross section of the electrode output piece 001. The included angle between the straight line where the first inclined surface 117 is located and the generatrix where the outer circumferential surface of the second segment 115 is located is α, which satisfies: 110°≤α≤160°.

[0071] It can be understood that 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°.

[0072] In the present embodiment, by the above limitation, the pole 011 and the terminal 012 have a suitable abutting angle, so as to improve the reliability of the abutting between the pole 011 and the terminal 012.

[0073] In addition, when the metal material of the contact portion is different from the metal material of the terminal 012, by limiting the included angle α, the material flowability of the contact portion between the terminal 012 and the pole 011 is ensured, which is beneficial to form the mutual engagement structure between the different flowability materials, thereby forming the interlocking structure.

[0074] Correspondingly, when the pole 011 is formed by combining the first metal piece 112 and the second metal piece 113, when the first inclined surface 117 is arranged thereon, the structure of the electrode output piece 001 is as shown in Figure 11 , Figure 11 is a structural schematic diagram of a fifth electrode output piece 001 provided by the embodiment of the present application.

[0075] In addition to the structure of the electrode output piece 001 provided by the foregoing embodiments, the embodiment of the present application provides the structure of the electrode output piece 001 in the following embodiments. In an embodiment, the terminal 012 is provided with a first through hole 121 for the pole 011 to pass through, and the pole 011 includes a first section 114 and a second section 115 connected in the axial direction. The outer diameter of the second section 115 is greater than that of the first section 114. The outer peripheral surface of the second section 115 is connected to the outer peripheral surface of the first section 114 through a first arc surface. One end of the first arc surface connected to the outer peripheral surface of the first section 114 is arranged closer to the axis of the pole 011 than the other end connected to the outer peripheral surface of the second section 115. The first arc surface is an abutting portion 111. A second arc surface is arranged on one side of the hole wall of the first through hole 121 close to the abutting portion 111. The first arc surface is configured to be engaged with the second arc surface after the pole 011 is axially pressed.

[0076] It can be understood that the first arc surface can be an arc surface protruding outward from the surface of the pole 011, and correspondingly, the second arc surface is an arc surface recessed inward from the surface of the terminal 012. Correspondingly, the first arc surface can also be an arc surface recessed inward from the surface of the pole 011, and correspondingly, the second arc surface is an arc surface protruding outward from the surface of the terminal 012.

[0077] In combination with the foregoing embodiments, when the pole 011 includes the first metal piece 112 and the second metal piece 113, the first section 114 is the side of the first metal piece 112 away from the second metal piece 113. The second section 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113. The first arc surface is arranged on the second metal piece 113.

[0078] In the present embodiment, by arranging the second arc surface and the first arc surface as the abutting portion 111 between the pole 011 and the terminal 012, the area of the abutting surface between the pole 011 and the terminal 012 can be increased at a certain height and radial dimension, thereby improving the cooperation reliability between the pole 011 and the terminal 012.

[0079] In addition to the structure of the electrode output member 001 provided in the foregoing embodiments, the embodiments of the present application also provide Figure 12 The structure of the electrode output member 001 is shown in FIG. 1. Figure 12 and Figure 13 , Figure 12 is a schematic view of a sixth structure of the electrode output member 001 provided by the embodiments of the present application. Figure 13 is Figure 12 is an enlarged view of B in FIG. 1. In an embodiment, the pole post 011 includes a first section 114 and a second section 115 connected in an axial direction, the second section 115 has an outer diameter larger than that of the first section 114, and a step 118 is arranged at the connection between the first section 114 and the second section 115. A step groove 123 is arranged on the hole wall of the first through hole 121 close to one side of the abutting portion 111. The step 118 is configured to be engaged with the groove wall of the step groove 123 after the pole post 011 is axially pressed.

[0080] In combination with the foregoing embodiments, when the pole post 011 includes the first metal piece 112 and the second metal piece 113, the first section 114 is the side of the first metal piece 112 away from the second metal piece 113. The second section 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113. The step 118 is arranged on the second metal piece 113.

[0081] In combination with the foregoing embodiments, when the pole post 011 includes the first metal piece 112 and the second metal piece 113, the first section 114 is the side of the first metal piece 112 away from the second metal piece 113. The second section 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113. The step 118 is arranged on the second metal piece 113. Figure 6 In combination with the foregoing embodiments, when the pole post 011 includes the first metal piece 112 and the second metal piece 113, the first section 114 is the side of the first metal piece 112 away from the second metal piece 113. The second section 115 is the second metal piece 113 and the end of the first metal piece 112 inserted into the second metal piece 113. The step 118 is arranged on the second metal piece 113.

[0082] In the present embodiment, by arranging the step groove 123 and the step 118 as the abutting 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 cooperation reliability between the pole post 011 and the terminal 012.

[0083] Correspondingly, when the pole post 011 is formed by combining the first metal piece 112 and the second metal piece 113, and the step 118 is arranged thereon, the structure of the electrode output member 001 is as shown in Figure 14 , Figure 14 is a schematic view of a seventh structure of the electrode output member 001 provided by the embodiments of the present application.

[0084] Please refer to Figure 15 , Figure 15is a structural schematic diagram of the cover plate assembly 002 provided by the embodiments of the present application. Accordingly, the embodiments of the present application provide a cover plate assembly 002. The cover plate assembly 002 comprises a cover plate 021, an upper plastic part 022, a lower plastic part 023, a current collecting part 024, a sealing ring and the aforementioned electrode output part 001. The cover plate 021 has a mounting hole. The pole column 011 is arranged in the mounting hole. The terminal 012 is located at one side of the cover plate 021. The upper plastic part 022 is arranged between the terminal 012 and the cover plate 021. The lower plastic part 023 is arranged at the other side of the cover plate 021. One end of the current collecting part 024 is connected with the end of the pole column 011 away from the terminal 012. The sealing ring is arranged between the pole column 011 and the side wall of the mounting hole.

[0085] In the embodiments, by using the aforementioned electrode output part 001, the pole column 011 can expand towards the terminal 012 to fill the fitting gap therebetween; meanwhile, in the process of the deformation of the pole column 011 towards the terminal 012, the terminal 012 is also deformed by the extrusion of the pole column 011 to form a mutual engagement structure at the contact position therebetween. In this way, the connection strength between the pole column 011 and the terminal 012 can be improved, the connection reliability between the terminal 012 and the pole column 011 can be improved, and the reliability of the cover plate assembly 002 can be improved.

[0086] Accordingly, the embodiments of the present application also provide a battery monomer. The battery monomer comprises a shell, an electrode assembly and the aforementioned cover plate assembly 002. The shell has a receiving cavity. The electrode assembly is arranged in the receiving cavity. The cover plate 021 is connected with the shell and seals the opening of the receiving cavity, and the other end of the current collecting part 024 is connected with the electrode assembly.

[0087] In the embodiments, by using the aforementioned cover plate assembly 002, the pole column 011 can expand towards the terminal 012 to fill the fitting gap therebetween; meanwhile, in the process of the deformation of the pole column 011 towards the terminal 012, the terminal 012 is also deformed by the extrusion of the pole column 011 to form a mutual engagement structure at the contact position therebetween. In this way, the connection strength between the pole column 011 and the terminal 012 can be improved, the connection reliability between the terminal 012 and the pole column 011 can be improved, and the reliability of the battery monomer can be improved.

[0088] The embodiments of the present application are described in detail above, and specific examples are applied in the description of the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation modes and application ranges can be changed according to the idea of the present application. In summary, the content of the description should not be understood as a limitation of the present application.

Claims

1. An electrode output member characterized by comprising: The electrode post comprises: a contact portion provided on the outer circumferential surface of the electrode post; a terminal sleeved on one end of the electrode post and abutting against the contact portion along the axial direction of the electrode post; wherein the contact portion between the electrode post and the terminal forms a mutual engagement structure.

2. The electrode output of claim 1, wherein, The electrode post has a contact portion in contact with the terminal, and the metal material of part of the contact portion is not the same as that of the terminal.

3. The electrode output of claim 2, wherein, The electrode post comprises a first metal piece and a second metal piece connected together, the terminal is sleeved on the first metal piece, the contact portion is provided on the outer circumferential surface of the second metal piece, and the metal material of the terminal is not the same as that of the second metal piece.

4. The electrode output of claim 3, wherein, A groove is provided on the second metal piece, one end of the first metal piece is fitted into the groove, the part of the first metal piece cooperating with the terminal is a first outer circumferential surface, the second metal piece has a second outer circumferential surface, the second outer circumferential surface is located on the side of the contact portion away from the groove bottom, and the first outer circumferential surface and the second outer circumferential surface are coaxially arranged.

5. The electrode output of claim 3, wherein, The material of the terminal is aluminum material, the material of the second metal piece is copper material, or the material of the terminal and the first metal piece is aluminum material, and the material of the second metal piece is copper material.

6. The electrode output of any of claims 1-5, wherein, The electrode post comprises a first segment and a second segment connected together along the axial direction, the outer diameter of the second segment is greater than that of the first segment, the outer circumferential surface of the second segment is connected with the outer circumferential surface of the first segment through a first plane, the first plane is perpendicular to the axis of the electrode post, and the first plane is the contact portion.

7. The electrode output of any one of claims 1-5, wherein, The terminal is provided with a first through hole for the electrode post to pass through, the electrode post comprises a first segment and a second segment connected together along the axial direction, the outer diameter of the second segment is greater than that of the first segment, the outer circumferential surface of the second segment is connected with the outer circumferential surface of the first segment through a first inclined surface, one end of the first inclined surface connected with the outer circumferential surface of the first segment is arranged closer to the axis of the electrode post than the other end connected with the outer circumferential surface of the second segment, the first inclined surface is the contact portion, a second inclined surface is arranged on one side of the hole wall of the first through hole close to the contact portion, and the first inclined surface is configured to mutually engage with the second inclined surface after the electrode post is axially pressed.

8. The electrode output of claim 7, wherein, In the longitudinal section of the electrode output member, the included angle between the straight line where the first inclined surface is located and the generatrix where the outer circumferential surface of the second segment is located is α, and 110°≤α≤160° is satisfied.

9. The electrode output of any one of claims 1-5, wherein, The terminal is provided with a first through hole for the electrode post to pass through, the electrode post comprises a first segment and a second segment connected together along the axial direction, the outer diameter of the second segment is greater than that of the first segment, the outer circumferential surface of the second segment is connected with the outer circumferential surface of the first segment through a first arc surface, one end of the first arc surface connected with the outer circumferential surface of the first segment is arranged closer to the axis of the electrode post than the other end connected with the outer circumferential surface of the second segment, the first arc surface is the contact portion, a second arc surface is arranged on one side of the hole wall of the first through hole close to the contact portion, and the first arc surface is configured to mutually engage with the second arc surface after the electrode post is axially pressed.

10. The electrode output of any one of claims 1-5, wherein, The pole post comprises a first section and a second section connected in an axial direction, the second section has an outer diameter larger than that of the first section, and a step is arranged at the connection between the first section and the second section; the terminal is provided with a first through hole for the pole post to pass through, a step groove is arranged on the hole wall of the first through hole close to one side of the abutting portion, and the step is configured to be engaged with the groove wall of the step groove after the pole post is axially pressed.

11. A cover plate assembly characterized by, The electrode output comprises: a cover plate having a mounting hole; the pole post passes through the mounting hole, and the terminal is located on one side of the cover plate; an upper plastic part arranged between the terminal and the cover plate; a lower plastic part arranged on the other side of the cover plate; a current collecting part having one end connected to the end of the pole post away from the terminal; a sealing ring arranged between the pole post and the side wall of the mounting hole.

12. A battery cell, characterized by The electrode assembly comprises: a shell having a containing cavity; an electrode assembly arranged in the containing cavity; and the cover plate assembly according to claim 11, wherein the cover plate is connected to the shell and closes the opening of the containing cavity, and the other end of the current collecting part is connected to the electrode assembly.

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