Pole, end cover assembly and battery

Abstract

The utility model discloses a pole, an end cover assembly and a battery, the pole comprises a first metal layer and a second metal layer, and the side edge of the first metal layer is provided with a first flange part; a second flange part is arranged on the side edge of the second metal layer, the first metal layer is compositely connected with the second metal layer, and the first flange part is compositely connected with the second flange part; wherein a certain distance is reserved between one side surface, deviating from the second flange part, of the first flange part and one side surface, deviating from the second metal layer, of the first metal layer, and a certain distance is reserved between one side surface, deviating from the first flange part, of the second flange part and one side surface, deviating from the first metal layer, of the second metal layer. The problems that an existing pole is prone to damage due to large deformation of one material and low in machining yield are solved, and the pole has the advantages of being simple in structure, easy to machine and high in product yield.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a pole, an end cap assembly and a battery. Background Art

[0002] In power batteries, the terminal is a component that connects the inside and outside of the battery. One end of the terminal is connected to the outside of the battery, and the other end is connected to the internal core pack of the battery, thereby realizing the charging and discharging functions.

[0003] The negative electrode post is made of a composite of aluminum and copper, with a side flange located at one end. During the stamping process, one material deforms significantly while the other remains largely unchanged. The material with the greater deformation is more susceptible to damage, affecting the post's processing yield. Utility Model Content

[0004] The embodiments of the present application provide a pole, an end cover assembly, and a battery to solve the problem that the existing pole is easily damaged due to large deformation of one material and has a low processing yield.

[0005] In a first aspect, an embodiment of the present application provides a pole, comprising:

[0006] a first metal layer, wherein a first flange portion is provided on a side of the first metal layer;

[0007] a second metal layer, wherein a second flange portion is provided on a side of the second metal layer, the first metal layer and the second metal layer are compositely connected, and the first flange portion and the second flange portion are compositely connected;

[0008] Therein, a certain distance is between a side surface of the first flange portion facing away from the second flange portion and an end surface of the first metal layer facing away from the second metal layer, and a certain distance is between a side surface of the second flange portion facing away from the first flange portion and an end surface of the second metal layer facing away from the first metal layer.

[0009] Optionally, the hardness of the second metal layer is greater than the hardness of the first metal layer.

[0010] Optionally, along the axis direction of the pole, the cross-sectional area of ​​the first metal layer is S1, and the cross-sectional area of ​​the second metal layer is S2, wherein S1>S2.

[0011] Optionally, the bonding surface between the first metal layer and the second metal layer includes a first horizontal segment, a curved segment, and a second horizontal segment that are coaxially arranged and connected in sequence, the curved segment is located between the first horizontal segment and the second horizontal segment, the second horizontal segment is closer to the side of the second metal layer away from the first metal layer than the first horizontal segment, and the curved segment is bent toward the side away from the second horizontal segment.

[0012] Optionally, a second groove is provided on a side of the first metal layer facing away from the second metal layer, and the second groove is coaxially arranged with the first metal layer.

[0013] Optionally, the bottom of the second groove is closer to a side surface of the second metal layer facing away from the first metal layer than the first horizontal section;

[0014] and / or, the bottom diameter of the second groove is D1, and the notch diameter of the second groove is D2, wherein D2>D1;

[0015] And / or, the angle formed between the groove wall and the groove bottom of the second groove is β, wherein 90°≤β<180°.

[0016] Optionally, a third groove is provided on a side of the second metal layer facing away from the first metal layer, and the third groove is coaxially arranged with the second metal layer.

[0017] Optionally, along the axial direction of the pole, the projection of the second groove falls within the projection of the third groove.

[0018] Optionally, along a direction perpendicular to the axis of the pole (110), a protruding distance of the first flange portion and / or the second flange portion is L1, wherein 0.5 mm ≤ L1 ≤ 3.5 mm;

[0019] and / or, along the axial direction of the pole, a distance between opposite sides of the first flange portion and the second flange portion is t1, wherein 0.2 mm < t1 < 5 mm;

[0020] and / or, the distance between the opposite sides of the first flange portion and the second flange portion is t1, the thickness of the second flange portion is t2, wherein 0.01*t1<t2<0.9*t1;

[0021] And / or, a distance between a joining surface of the first flange portion and the second flange portion and an end of the pole facing away from the battery cell is t3, wherein 0.3 mm ≤ t3 ≤ 5 mm.

[0022] Optionally, a traceability code is provided on a side of the second metal layer facing away from the first metal layer.

[0023] Optionally, an anti-torsion portion is provided on the first metal layer and / or the second metal layer.

[0024] In a second aspect, an embodiment of the present application provides an end cover assembly, comprising the above-mentioned pole.

[0025] In a third aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned end cap assembly, shell and electrode assembly, wherein the electrode assembly is installed in the shell, the end cap assembly is sealed to the shell, and the metal part is located on the side of the plastic part away from the electrode assembly.

[0026] The embodiments of the present application provide a pole, an end cover assembly, and a battery, wherein the pole includes a first metal layer and a second metal layer, a first flange portion is provided on a side of the first metal layer, a second flange portion is provided on a side of the second metal layer, the first metal layer and the second metal layer are compositely connected, the first flange portion and the second flange portion are compositely connected, and a side of the first flange portion facing away from the second flange portion is spaced a certain distance from a side of the first metal layer facing away from the second metal layer, and a side of the second flange portion facing away from the first flange portion is spaced a certain distance from a side of the second metal layer facing away from the first metal layer, that is, the first flange portion and the second flange portion are located in the area between the upper and lower end surfaces of the pole, both the first metal layer and the second metal layer are deformed, and the deformation of the two materials is moderate, overcoming the problem of the existing pole being easily damaged and having a low processing yield due to large deformation of one of the materials, and having the advantages of simple structure, easy processing, and high product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0029] Figure 1 A three-dimensional diagram of a pole provided in an embodiment of the present application.

[0030] Figure 2 This is a cross-sectional view of the first form of the pole provided in an embodiment of the present application.

[0031] Figure 3 This is a cross-sectional view of the second form of the pole provided in an embodiment of the present application.

[0032] Figure 4 This is a labeled diagram of the pole provided in an embodiment of the present application.

[0033] Figure 5 This is a schematic structural diagram of an anti-torsion portion provided on a pole according to an embodiment of the present application.

[0034] Figure 6A schematic structural diagram of the end cover assembly provided in an embodiment of the present application.

[0035] Figure 7 An exploded view of the end cover assembly provided in an embodiment of the present application.

[0036] Figure 8 A cross-sectional view of an end cap assembly provided in an embodiment of the present application.

[0037] Figure 9 for Figure 8 A partial enlarged view of point A in the middle.

[0038] 10. End cap assembly; 100. Pole assembly; 110. Pole; 111. First metal layer; 1111. Second groove; 112. Second metal layer; 1121. Third groove; 113. First flange portion; 114. Second flange portion; 115. Joint surface; 1151. First horizontal section; 1152. Bend section; 1153. Second horizontal section; 116. Anti-torsion portion; 120. Sealing ring; 121. First groove; 130. Insulating seal; 200. Cover plate assembly; 210. Mounting hole; 220. Second raised portion; 230. Metal part. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of this application.

[0040] See also Figure 1 、 Figure 2 and Figure 3, an embodiment of the present application provides an electrode 110, which can be a negative electrode. The electrode 110 includes a first metal layer 111 and a second metal layer 112. The first metal layer 111 has a first metal body and a first flange portion 113 arranged on the side of the first metal body. The first flange portion 113 is integrally formed with the first metal body. The first flange portion 113 is made of the same material as the first metal body. The second metal layer 112 has a second metal body and a second flange portion 114 arranged on the side of the second metal body. The second metal body and the second flange portion 114 are integrally formed. The second metal body and the second flange portion 114 are made of the same material. The first metal body and the second metal body are both cylindrical structures. The first metal layer 111 and the second metal layer 112 are composited, and the first flange portion 113 is composited with the second flange portion 114. Along the axial direction of the pole 110, a certain distance is between a side surface of the first flange portion 113 facing away from the second flange portion 114 and an end surface of the first metal layer 111 facing away from the second metal layer 112, and a certain distance is between a side surface of the second flange portion 114 facing away from the first flange portion 113 and an end surface of the second metal layer 112 facing away from the first metal layer 111.

[0041] In the embodiment of the present application, the distance between the first flange portion 113 on the first metal layer 111 and the top surface of the first metal layer 111 determines the deformation of the first metal layer 111, and the distance between the second flange portion 114 of the second metal layer 112 and the bottom surface of the second metal layer 112 determines the deformation of the second metal layer 112. A certain distance is set between the side of the first flange portion 113 facing away from the second flange portion 114 and the side of the first metal layer 111 facing away from the second metal layer 112, and a certain distance is set between the side of the second flange portion 114 facing away from the first flange portion 113 and the side of the second metal layer 112 facing away from the first metal layer 111, so that the first metal layer 111 and the second metal layer 112 have a certain amount of deformation, reducing the probability of damage to the metal layer due to increased deformation of a single metal material, affecting the processing yield of the pole 110, and improving the reliability of the pole 110.

[0042] In some embodiments, the hardness of the second metal layer 112 is greater than that of the first metal layer 111. For example, the first metal layer 111 is an aluminum metal layer, and the second metal layer 112 is a copper metal layer.

[0043] Exemplarily, the pole 110 is a composite structure in which a copper plate and an aluminum plate are compounded together by special processes such as rolling, sintering, and friction welding before cold heading. That is, before the pole 110 is cold headed, the aluminum metal layer is already compounded on the copper metal layer, and the copper-aluminum composite is an integral structure, in which the copper metal layer and the aluminum metal layer are inseparable. During the cold heading process, the copper-aluminum composite structure is placed in the cold heading equipment, and the cold heading forming process of the pole 110 can be performed. The bonding surface 115 of the first metal layer 111 and the second metal layer 112 is a copper-aluminum bonding surface 115. The copper-aluminum bonding surface 115 of the pole 110 after cold heading is the original bonding surface 115 of the copper-aluminum composite structure, which is the bonding surface 115 that is deformed after cold heading. The manufacturing process is simple, which reduces the process cost and improves the production efficiency of the pole 110.

[0044] In the embodiment of the present application, the hardness of the second metal layer 112 is greater than that of the first metal layer 111. Correspondingly, the hardness of the second flange portion 114 is greater than that of the first flange portion 113. While meeting the strength requirements of the electrode 110, the second metal layer 112 is a copper metal layer, the same material as the current collector inside the battery, which facilitates welding of the electrode 110 to the current collector. The first metal layer 111 is an aluminum metal layer, the same material as the busbar, which facilitates welding of the electrode 110 to the busbar. The welding operation of the electrode 110 is easy.

[0045] In some embodiments, see Figure 4 Along the axis direction of the pole 110 , the cross-sectional area of ​​the first metal layer 111 is S1 , and the cross-sectional area of ​​the second metal layer 112 is S2 , wherein S1 > S2 .

[0046] In the embodiment of the present application, the hardness of the second metal layer 112 is greater than the hardness of the first metal layer 111, and the density of the second metal layer 112 is greater than the density of the first metal layer 111. The cross-sectional area of ​​the second metal layer 112 is set to be smaller than the cross-sectional area of ​​the first metal layer 111, thereby reducing the amount of metal material used in the second metal layer 112, achieving the purpose of lightweight configuration, and also reducing the cost of the pole 110.

[0047] In some embodiments, see Figure 3 The bonding surface 115 between the first metal layer 111 and the second metal layer 112 includes a first horizontal segment 1151, a curved segment 1152, and a second horizontal segment 1153, which are coaxially arranged and sequentially connected. The first horizontal segment 1151 is annular, and the second horizontal segment 1153 is circular. The curved segment 1152 is located between the first horizontal segment 1151 and the second horizontal segment 1153, and the curved segment 1152 smoothly transitions between the first horizontal segment 1151 and the second horizontal segment 1153. The second horizontal segment 1153 is closer to the battery cell than the first horizontal segment 1151, and the curved segment 1152 bends away from the second horizontal segment 1153.

[0048] In the embodiment of the present application, the bonding surface 115 between the first metal layer 111 and the second metal layer 112 is a curved surface. The increased area of ​​the bonding surface 115 between the first metal layer 111 and the second metal layer 112 improves the bonding strength between the first metal layer 111 and the second metal layer 112. The increased area of ​​the bonding surface 115 is conducive to reducing the interface resistance of the bonding surface 115. In addition, the pole 110 is formed by stamping, piercing, and extrusion, and the bonding surface 115 is a curved surface, which minimizes damage to the bonding surface 115 during the processing and improves the structural performance of the pole 110.

[0049] In some embodiments, see Figure 3 A second groove 1111 is provided on a side of the first metal layer 111 facing away from the second metal layer 112 , and the second groove 1111 is coaxially arranged with the first metal layer 111 .

[0050] In the embodiment of the present application, by setting a second groove 1111 on the surface of the first metal layer 111, it is beneficial to position and shape the first flange portion 113 on the side of the first metal layer 111, ensuring that the first flange portion 113 is coaxial with the first metal layer 111, thereby improving the sealing effect.

[0051] In some embodiments, see Figure 2 and Figure 3 The bottom of the second groove 1111 on the first metal layer 111 is closer to the bottom surface of the second metal layer 112 than the first horizontal section 1151. The second groove 1111 is deeper, which reduces the material of the first metal layer 111 and reduces the cost of the pole 110.

[0052] In some embodiments, see Figure 4 The bottom of the second groove 1111 is circular, the diameter of the bottom of the second groove 1111 is D1, the opening of the second groove 1111 is circular, the diameter of the opening of the second groove 1111 is D2, wherein D2>D1. The second groove 1111 adopts an expanded structure, which is conducive to the processing and forming of the second groove 1111.

[0053] In some embodiments, see Figure 4 The angle β formed between the groove wall and the groove bottom of the second metal second groove 1111 is 90°≤β<180°. For example, β can be 90°, 100°, 112°, 125°, 137°, 148°, 156°, 163°, 179°, or other unspecified values. The sidewalls of the second groove 1111 are cylindrical or conical, which facilitates the processing and shaping of the second groove 1111.

[0054] In some embodiments, see Figure 4A third groove 1121 is provided on the side of the second metal layer 112 facing away from the first metal layer 111. The third groove 1121 is coaxially arranged with the second metal layer 112. By forming the third groove 1121 on the second metal layer 112, the material of the second metal layer 112 is reduced, thereby reducing the weight of the pole 110 and reducing the cost of the pole 110.

[0055] In some embodiments, see Figure 4 , along the axial direction of the pole 110, the projection of the second groove 1111 falls within the projection of the third groove 1121. The diameter of the notch of the third groove 1121 is larger than the diameter of the groove bottom of the third groove 1121, and the third groove 1121 adopts a flared structure. The diameter of the notch of the second groove 1111 is larger than the diameter of the groove bottom of the second groove 1111, and the second groove 1111 adopts a flared structure. The groove bottom diameter of the third groove 1121 is larger than the notch diameter of the second groove 1111. This is conducive to controlling the flatness and planarity of the annular surface of the first metal layer 111 and reducing the outer collapse angle of the third groove 1121.

[0056] In some embodiments, see Figure 4 The protrusion distance of the first flange portion 113 and / or the second flange portion 114 in a direction perpendicular to the axis of the pole 110 is L1, where 0.5 mm ≤ L1 ≤ 3.5 mm. The value of L1 can be 0.5 mm, 0.9 mm, 1.5 mm, 2.2 mm, 2.9 mm, 3.5 mm, or other unspecified values. The protrusion distance refers to the distance between the side of the first flange portion 113 and / or the second flange portion 114 facing away from the center of the pole 110 and the side of the first flange portion 113 and / or the second flange portion 114 closer to the center of the pole 110 in a direction perpendicular to the axis of the pole 110.

[0057] In the embodiment of the present application, the distance between the side of the first flange portion 113 and / or the second flange portion 114 facing away from the pole 110 and the side of the pole 110 is reasonably designed to ensure that the first flange portion 113 and the second flange portion 114 can extend into the first groove 121, satisfying the assembly relationship between the pole 110, the sealing ring 120 and the insulating seal 130.

[0058] In some embodiments, see Figure 4 Along the axial direction of the pole 110, the distance between the opposite sides of the first flange portion 113 and the second flange portion 114 is t1, where 0.2 mm < t1 < 5 mm. The distance between the opposite sides of the first flange portion 113 and the second flange portion 114 is the distance between the side of the first flange portion 113 facing away from the second flange portion 114 and the side of the second flange portion 114 facing away from the first flange portion 113. The value of t1 can be 0.3 mm, 0.8 mm, 1.5 mm, 2.2 mm, 3.8 mm, 4.7 mm, or other unspecified values.

[0059] In some embodiments, see Figure 4 , the distance between the opposite sides of the first flange portion 113 and the second flange portion 114 is t1, and the thickness of the second flange portion 114 is t2, wherein 0.01*t1<t2<0.9*t1. The thickness of the second flange portion 114 refers to the distance between the side of the second flange portion 114 facing away from the first flange portion 113 and the side close to the first flange portion 113 along the axis of the pole 110. The value of t2 can be 0.06*t1, 0.11*t1, 0.17*t1, 0.24*t1, 0.29*t1, 0.36*t1, 0.44*t1, 0.53*t1, 0.65*t1, 0.72*t1, 0.86*t1 or other unlisted values. While meeting the structural strength of the second flange portion 114, the thickness design space of the second flange portion 114 is relatively large.

[0060] In some embodiments, see Figure 4 The distance between the joint surface 115 of the first flange portion 113 and the second flange portion 114 and the end of the pole 110 away from the battery cell is t3, wherein 0.3mm≤t3≤5mm. The value of t3 can be 0.3mm, 1.0mm, 2.1mm, 3.3mm, 4.5mm, 5mm or other unspecified values. The distance between the joint surface 115 of the first flange portion 113 and the second flange portion 114 and the end of the pole 110 away from the battery cell can be set according to different battery sizes to reduce the height of the pole 110 as much as possible, reduce the size proportion of the pole 110 in the height direction of the battery, increase the internal space of the battery, and improve the battery capacity design.

[0061] In some embodiments, see Figure 5 , an anti-torsion portion 116 is provided on the first metal layer 111 and / or the second metal layer 112. Correspondingly, an anti-torsion matching portion for use with the anti-torsion portion 116 is provided on the insulating seal 130 that is sealed and connected to the pole 110, and the anti-torsion portion 116 is engaged with the anti-torsion matching portion. The anti-torsion portion 116 is a protrusion structure provided on the surface of the pole 110, such as a plurality of protrusion structures, and the plurality of protrusion structures are arranged at intervals along the circumference of the pole 110. Correspondingly, the anti-torsion matching portion is a first groove structure provided on the insulating seal 130, and the plurality of first groove structures are engaged with the protrusion structure. As a variation, the anti-torsion portion 116 is a groove structure, and the anti-torsion matching portion is a protrusion structure. Alternatively, the anti-torsion portion 116 includes a groove structure and a protrusion structure, and the anti-torsion matching portion includes a protrusion structure and a groove structure.

[0062] The anti-torsion portion 116 on the pole 110 and the anti-torsion matching portion on the insulating seal 130 form a chimeric structure to prevent the pole 110 and the insulating seal 130 from rotating relative to each other. The pole 110 has a good anti-torsion effect and improves the mechanical properties of the pole 110.

[0063] In some embodiments, a traceability code is provided on the end surface of the electrode 110 near the battery cell. This code can be a QR code or a barcode. Scanning the code with a barcode scanner provides basic information about the electrode. This information includes binding information between the electrode 110 and the cover assembly 200, manufacturer information, production batch information, and more. This facilitates traceability of information about the electrode 110.

[0064] See also Figure 6 、 Figure 7 、 Figure 8 and Figure 9 The embodiment of the present application further provides an end cap assembly 10, comprising any one of the above-mentioned pole assembly 100 and a cover plate assembly 200. The cover plate assembly 200 is provided with a mounting hole 210, and the pole assembly 100 is fixed in the mounting hole 210.

[0065] In the embodiment of the present application, the pole assembly 100 includes a pole 110, a sealing ring 120, and an insulating seal 130. A first groove 121 is formed on the side of the sealing ring 120 facing the pole 110. The first groove 121 is adapted to fit the first flange portion 113 and the second flange portion 114 after bonding. The sealing ring 120 is sleeved on the pole 110, with the first flange portion 113 and the second flange portion 114 at least partially extending into the first groove 121. The upper sidewall of the first groove 121 on the sealing ring 120 is located above the upper surface of the first flange portion 113. The lower sidewall of the first groove 121 on the sealing ring 120 is located below the lower surface of the second flange portion 114. A certain distance is separated from the side surface of the pole 110 by the side of the sealing ring 120 facing the pole 110. The sealing ring 120 is made of metal material and has high structural strength. The metal material can be aluminum, stainless steel, or a composite material of aluminum and stainless steel.

[0066] In this embodiment, see Figure 9 , the insulating seal 130 is arranged between the pole 110 and the sealing ring 120. The insulating seal 130 satisfies both the insulating function and the sealing function. The sealing ring 120, the pole 110 and the insulating seal 130 are assembled and fixed. One side of the insulating seal 130 is in contact with the pole 110, and the other side is in contact with the sealing ring 120. The insulating seal 130 is provided on the upper side wall of the first groove 121 on the sealing ring 120 and the surface of the first flange portion 113. The insulating seal 130 is provided on the lower side wall of the first groove 121 on the sealing ring 120 and the surface of the second flange portion 114. The insulating seal 130 presses the first flange portion 113 and the second flange portion 114 tightly.

[0067] In the embodiment of the present application, an insulating sealing surface is formed on the upper surface of the first flange portion 113 and the lower surface of the second flange portion 114 of the pole 110 by means of a sealing ring 120 and an insulating seal 130. The sealing ring 120 and the insulating seal 130 apply opposite forces to the first flange portion 113 and the second flange portion 114 respectively, so that the first flange portion 113 and the second flange portion 114 are pressed and fitted together. The fitting force between the first metal layer 111 and the second metal layer 112 is increased. The sealing ring 120 limits the upward or downward movement of the pole 110, thereby improving the mechanical properties of the pole 110. Even if the pole 110 moves, the sealing ring 120 is always present to press the insulating seal 130, thereby ensuring the sealing effect of the pole 110. The pole assembly 100 has fewer parts, a simple structure, and good sealing and insulation effects.

[0068] In some embodiments, see Figure 7 and Figure 9 The cover assembly 200 comprises a metal component 230 and a plastic component 240. The metal component 230 is located on the side of the plastic component 240 facing away from the battery cell and is connected to the plastic component 240. The metal component 230 is a plain aluminum sheet, while the plastic component 240 is a plastic plate. For example, in a prismatic battery, both the metal component 230 and the plastic component 240 are rectangular plates. The plastic component 240 isolates the metal component 230 from the battery cell, improving battery safety.

[0069] The present embodiment also provides a battery comprising an end cap assembly 10, a housing, and an electrode assembly. The electrode assembly is mounted within the housing, the end cap assembly 10 being sealed to the housing, and a metal member 230 being located on a side of the plastic member 240 facing away from the electrode assembly. This embodiment has the same technical effects as the electrode column and will not be further described.

[0070] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0072] The above is a detailed introduction to the pole, end cover assembly and battery provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pole (110), characterized in that: include: a first metal layer (111), wherein a first flange portion (113) is provided on a side of the first metal layer (111); A second metal layer (112), a second flange portion (114) is provided on a side of the second metal layer (112), the first metal layer (111) and the second metal layer (112) are compositely connected, and the first flange portion (113) and the second flange portion (114) are compositely connected; There is a certain distance between a side surface of the first flange portion (113) facing away from the second flange portion (114) and an end surface of the first metal layer (111) facing away from the second metal layer (112), and there is a certain distance between a side surface of the second flange portion (114) facing away from the first flange portion (113) and an end surface of the second metal layer (112) facing away from the first metal layer (111).

2. The pole (110) according to claim 1, characterized in that The hardness of the second metal layer (112) is greater than the hardness of the first metal layer (111).

3. The pole (110) according to claim 1, characterized in that Along the axial direction of the pole (110), the cross-sectional area of ​​the first metal layer (111) is S1, and the cross-sectional area of ​​the second metal layer (112) is S2, wherein S1>S2.

4. The pole (110) according to claim 1, characterized in that The bonding surface (115) between the first metal layer (111) and the second metal layer (112) includes a first horizontal segment (1151), a curved segment (1152) and a second horizontal segment (1153) which are coaxially arranged and sequentially connected, the curved segment (1152) being located between the first horizontal segment (1151) and the second horizontal segment (1153), the second horizontal segment (1153) being closer to a side of the second metal layer (112) away from the first metal layer (111) than the first horizontal segment (1151), and the curved segment (1152) being bent toward a side away from the second horizontal segment (1153).

5. The pole (110) according to claim 4, characterized in that A second groove (1111) is provided on a side of the first metal layer (111) facing away from the second metal layer (112), and the second groove (1111) is coaxially arranged with the first metal layer (111).

6. The pole (110) according to claim 5, characterized in that The bottom of the second groove (1111) is closer to a side of the second metal layer (112) facing away from the first metal layer (111) than the first horizontal section (1151); And / or, the bottom diameter of the second groove (1111) is D1, and the notch diameter of the second groove (1111) is D2, wherein D2>D1; And / or, the angle formed between the groove wall and the groove bottom of the second groove (1111) is β, wherein 90°≤β<180°.

7. The pole (110) according to claim 5, characterized in that A third groove (1121) is provided on a side of the second metal layer (112) facing away from the first metal layer (111), and the third groove (1121) is coaxially arranged with the second metal layer (112).

8. The pole (110) according to claim 7, characterized in that Along the axial direction of the pole (110), the projection of the second groove (1111) falls within the projection of the third groove (1121).

9. The pole (110) according to any one of claims 1 to 4, characterized in that: Along a direction perpendicular to the axis of the pole (110), a protruding distance of the first flange portion (113) and / or the second flange portion (114) is L1, wherein 0.5 mm ≤ L1 ≤ 3.5 mm; and / or, along the axial direction of the pole (110), the distance between the opposite sides of the first flange portion (113) and the second flange portion (114) is t1, wherein 0.2 mm < t1 < 5 mm; and / or, the distance between the opposite sides of the first flange portion (113) and the second flange portion (114) is t1, the thickness of the second flange portion (114) is t2, wherein 0.01*t1<t2<0.9*t1; And / or, the distance between the joint surface (115) of the first flange portion (113) and the second flange portion (114) and the end of the pole (110) facing away from the battery cell is t3, wherein 0.3mm≤t3≤5mm.

10. The pole (110) according to any one of claims 1 to 4, characterized in that: A traceability code is provided on a side of the second metal layer (112) facing away from the first metal layer (111).

11. The pole (110) according to any one of claims 1 to 4, characterized in that: An anti-torsion portion (116) is provided on the first metal layer (111) and / or the second metal layer (112).

12. An end cap assembly (10), characterized in that: The invention comprises a pole (110) according to any one of claims 1 to 11.

13. A battery, characterized in that: The battery comprises an end cap assembly (10) as claimed in claim 12, a shell and an electrode assembly, wherein the electrode assembly is installed in the shell, the end cap assembly (10) is sealed to the shell, and the battery further comprises a metal part (230) and a plastic part (240), wherein the metal part (230) is located on a side of the plastic part (240) facing away from the electrode assembly.

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