End cover assembly and battery

Abstract

The utility model discloses an end cover assembly and a battery, the end cover assembly comprises a pole assembly and a cover plate assembly, the pole assembly comprises a pole and a pressing piece, and the pole comprises a first metal layer and a second metal layer; a first groove is formed in the side, facing the pole, of the pressing piece, the combination face of the first metal layer and the second metal layer is located in the first groove, the pressing piece abuts against the two sides, deviating from each other, of the first metal layer and the second metal layer, and the pressing piece is fixedly connected with the cover plate assembly. The problem that two metal materials of an existing pole assembly are small in binding force and easy to separate is solved, and the pole assembly has the advantages of being simple and compact in structure and high in pole structural strength.

Description

Technical Field

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

[0002] The end cover assembly of the battery includes a cover plate, a connecting piece and a pole assembly. Among them, the pole assembly includes a seal, an insulating piece, a structural piece and a pole. The structural piece is assembled with the cover plate to fix the seal and the insulating piece on the pole to achieve insulation sealing of the pole. In the related art, the pole is made of a composite of two different metal materials, and the seal and the structural piece only seal and limit one of the metal materials. As the pole moves under force, the bonding force of the two metal materials of the pole becomes smaller, which may cause the two metal materials to separate, and the resistance of the bonding surface of the pole is large, affecting the function of the pole. Utility Model Content

[0003] The embodiments of the present application provide an end cap assembly and a battery to solve the problem that the two metal materials of the existing electrode assembly have weak bonding strength and are easy to separate.

[0004] In a first aspect, an embodiment of the present application provides an end cap assembly, comprising:

[0005] A pole assembly, the pole assembly comprising a pole and a pressing member, the pole comprising a first metal layer and a second metal layer, the first metal layer being connected to the second metal layer, the pressing member having a first groove formed on a side facing the pole, the bonding surface of the first metal layer and the second metal layer being located within the first groove, and the pressing member pressing against two sides of the first metal layer and the second metal layer facing away from each other;

[0006] The cover plate assembly is fixedly connected to the pressing member.

[0007] Optionally, the pressing member includes a first horizontal portion, a vertical portion, and a second horizontal portion connected in sequence, the vertical portion is located between the first horizontal portion and the second horizontal portion, and the vertical portion connects the first horizontal portion and the second horizontal portion at one end facing away from the pole.

[0008] Optionally, the first horizontal portion, the vertical portion and the second horizontal portion are integrally formed.

[0009] Optionally, a first protrusion is provided on a side of the vertical portion facing away from the pole, and a welding area is provided on the first protrusion.

[0010] Optionally, the first protrusion is provided at one end of the vertical portion close to the first horizontal portion;

[0011] Alternatively, the first protrusion is provided at one end of the vertical portion close to the second horizontal portion;

[0012] Alternatively, the first protrusion is arranged in a region close to the middle of the vertical portion.

[0013] Optionally, along the axial direction of the pressing member, the height of the first horizontal portion is h1, the height between the side surfaces opposite to the second horizontal portion is H, and at least one of the following conditions is satisfied:

[0014] 0.1mm≤h1≤2mm;

[0015] 2h1<H≤2h1+5.

[0016] Optionally, along the axial direction of the pressing member, the height of the first horizontal portion is h1, wherein 5 MPa / mm≤P / h1≤5000 MPa / mm, and P is the strength of the pressing member;

[0017] and / or, 2.5 N / mm3≤HB / h1≤4000 N / mm3, where HB is the hardness of the pressing member.

[0018] Optionally, the pressing member further includes an extending portion, which is provided at an end of the second horizontal portion away from the vertical portion, and extends toward a side away from the first horizontal portion.

[0019] Optionally, along the axial direction of the pressing member, the height of the first horizontal portion is h1, the height between the opposite sides of the first horizontal portion and the second horizontal portion is H, and the height of the extending portion is h2, and at least one of the following conditions is met:

[0020] 0.1mm≤h1≤2mm;

[0021] 2h1<H≤2h1+5;

[0022] 0<h2≤5mm.

[0023] Optionally, an insulating seal is further included, which is arranged between the pressing member and the pole, and the insulating seal is insulated and sealed connection with the pressing member and the pole.

[0024] Optionally, a plurality of through holes are provided on the pressing member, the plurality of through holes are arranged at intervals along the circumference of the pressing member, the through holes are communicated with the first groove, and the insulating sealing member fills the through holes.

[0025] Optionally, the through holes are arranged at equal intervals along the circumference of the pressing member.

[0026] Optionally, the insulating seal includes a first insulating portion, a sealing portion and a second insulating portion. Along the axial direction of the pole, the sealing portion is located between the first insulating portion and the second insulating portion. The first insulating portion is in contact with the side of the first metal layer, and the second insulating portion is in contact with the side of the second metal layer. The sealing portion is sealed and connected to the first metal layer and / or the second metal layer. The hardness of the sealing portion is less than that of the first insulating portion and the second insulating portion.

[0027] Optionally, a portion of the insulating seal is in close contact with a side of the pressing member facing away from the pole.

[0028] Optionally, a portion of the insulating seal is in close contact with a side of the pressing member close to the core package.

[0029] Optionally, the insulating seal is integrally formed.

[0030] Optionally, the insulating seal is arranged to be inclined away from the end surface of the pole, and the end surface is configured to fit with the cover plate assembly.

[0031] Optionally, the inclination angle of the end face is a, where 0°<a≤100°.

[0032] Optionally, a buckling portion is provided on a side of the insulating seal close to the core package, and the buckling portion is configured to be buckled and connected with a buckling fitting portion on the cover assembly.

[0033] Optionally, a side of the pole that contacts the insulating seal is provided with a plurality of pits, and the insulating seal fills the pits;

[0034] And / or, a side surface of the pressing member in contact with the insulating seal is provided with a plurality of pits, and the insulating seal fills the pits.

[0035] Optionally, the hardness of the insulating seal is HS, wherein 20HA≤HS≤95HA.

[0036] Optionally, the pole is provided with an anti-torsion portion, and the insulating seal is provided with the anti-torsion matching portion, and the anti-torsion portion and the anti-torsion matching portion are engaged with each other to limit the rotation of the pole.

[0037] Optionally, a traceability code is provided on the pole.

[0038] Optionally, the hardness of the second metal layer is greater than the hardness of the first metal layer.

[0039] Optionally, the second metal layer and the first metal layer are made of different materials, and the second metal layer and the first metal layer are an integrated composite member; or

[0040] The second metal layer and the first metal layer are made of different materials. The second metal layer and the first metal layer are provided separately, and the second metal layer and the first metal layer are embedded.

[0041] Optionally, a first flange portion is provided on the side of the first metal layer, and a second flange portion is provided on the side of the second metal layer. The first flange portion is connected to the second flange portion. The first flange portion and the second flange portion are located in the first groove, and the pressing member presses the two sides of the first flange portion and the second flange portion that are away from each other.

[0042] Optionally, along a direction perpendicular to the pole axis, a protruding distance of the first flange portion and / or the second flange portion is L1, wherein 0.5 mm ≤ L1 ≤ 3.5 mm;

[0043] 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;

[0044] 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;

[0045] 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 core package is t3, wherein 0.3 mm ≤ t3 ≤ 5 mm.

[0046] 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.

[0047] 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 which 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 core package than the first horizontal segment, and the curved segment is bent toward the side away from the second horizontal segment.

[0048] 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.

[0049] Optionally, the bottom of the second groove is closer to the battery cell than the first horizontal section;

[0050] and / or, the bottom diameter of the second groove is D1, and the notch diameter of the second groove is D2, wherein D2>D1;

[0051] And / or, the angle formed between the groove wall and the groove bottom of the second groove is β, wherein 90°≤β<180°.

[0052] 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.

[0053] Optionally, along the axial direction of the pole, the projection of the second groove falls within the projection of the third groove.

[0054] Optionally, the cover plate assembly is provided with a mounting hole, and the pole assembly is fixed in the mounting hole.

[0055] Optionally, the pressing member is fixed to the side wall of the mounting hole on the cover assembly by welding.

[0056] Optionally, the cover plate assembly includes a metal component and a plastic component, the metal component is located on a side of the plastic component away from the core package, and the metal component is connected to the plastic component.

[0057] Optionally, a mounting groove is provided on the side of the metal part facing the plastic part, the groove opening size of the mounting groove is smaller than the groove bottom size of the mounting groove, and a third protrusion is provided on the side of the plastic part facing the metal part, and the third protrusion is fixed in the mounting groove.

[0058] Optionally, a positioning protrusion is provided at the bottom of the installation groove on the metal component, and a positioning groove cooperating with the positioning protrusion is provided on a side surface of the third protrusion that is in contact with the groove bottom.

[0059] Optionally, the positioning protrusion is coaxially arranged with the mounting groove.

[0060] Optionally, along the thickness direction of the metal piece, the cross-sectional shape of the mounting groove is an inverted trapezoid;

[0061] Alternatively, the side wall of the mounting groove includes a first vertical section, a connecting section, and a second vertical section connected in sequence, the first vertical section is closer to the bottom of the mounting groove than the second vertical section, and the second vertical section is closer to the axis of the mounting groove than the first vertical section.

[0062] Optionally, a fourth groove is provided on a side of the metal component facing the plastic component, and the fourth groove is arranged along the circumference of the mounting groove.

[0063] Optionally, a boss is provided on a side of the metal component facing away from the plastic component, and along the thickness direction of the metal component, a projection of the mounting groove is located within the projection of the boss.

[0064] Optionally, a distance between a surface of the boss facing away from the metal component and a surface of the metal component facing away from the plastic component is L2, 0<L2≤0.5mm.

[0065] Optionally, a recessed platform is provided on a side of the metal component facing away from the plastic component, and along the thickness direction of the metal component, a projection of the mounting groove is located within the projection of the recessed platform.

[0066] In a second aspect, an embodiment of the present application further provides a battery comprising the end cap assembly described in any one of the above.

[0067] An embodiment of the present application provides an end cap assembly and a battery, wherein the end cap assembly includes a pole assembly and a cover plate assembly, the pole assembly includes a pole and a pressing piece, the pressing piece is fixedly connected to the cover plate assembly, the pole includes a first metal layer and a second metal layer connected, a first groove is formed on the side of the pressing piece facing the pole, the bonding surface of the first metal layer and the second metal layer is located in the first groove, the pressing piece presses the two sides of the first metal layer and the second metal layer away from each other, the pressing piece and the insulating seal always act on the side of the first metal layer and the second metal layer facing away from each other, and apply opposite forces to the first metal layer and the second metal layer respectively, so that the bonding surface of the first metal layer and the second metal layer is pressed and fitted, thereby improving the bonding strength between the first metal layer and the second metal layer, overcoming the problem of low bonding strength and easy separation of the two metal materials of the existing pole assembly, and having the advantages of simple and compact structure and high pole structure strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] 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.

[0069] 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.

[0070] Figure 1 A three-dimensional view of the end cover assembly provided in an embodiment of the present application.

[0071] Figure 2 This is a first exploded view of the end cover assembly provided in an embodiment of the present application.

[0072] Figure 3 A cross-sectional view of an end cap assembly provided in an embodiment of the present application.

[0073] Figure 4 for Figure 3 A partial enlarged view of the first form at A in the middle.

[0074] Figure 5 for Figure 3 A partial enlarged view of the second form at A in the middle.

[0075] Figure 6 for Figure 3 A partial enlarged view of the third form at A in the middle.

[0076] Figure 7 for Figure 3 A partial enlarged view of the fourth form at A in the middle.

[0077] Figure 8 for Figure 3 A partial enlarged view of the fifth form at A in the middle.

[0078] Figure 9 for Figure 3 A partial enlarged view of the sixth form at A in the middle.

[0079] Figure 10 for Figure 3 A partial enlarged view of the seventh form at A in the middle.

[0080] Figure 11 This is a partial enlarged view of the assembled compression piece, pole and insulating seal.

[0081] Figure 12 A top view of the end cap assembly provided in an embodiment of the present application.

[0082] Figure 13 This is a second exploded view of the end cover assembly provided in an embodiment of the present application.

[0083] Figure 14 for Figure 12 Middle AA section view.

[0084] Figure 15 for Figure 14 A partial enlarged view of the first form at C in the middle.

[0085] Figure 16 for Figure 14 A partial enlarged view of the second form at C in the middle.

[0086] Figure 17 for Figure 14 A partial enlarged view of the third form at C in the middle.

[0087] Figure 18 A three-dimensional diagram of the first form of the pressing member provided in an embodiment of the present application.

[0088] Figure 19 A stereoscopic view of the second form of the pressing member provided in an embodiment of the present application.

[0089] Figure 20 A three-dimensional diagram of the third form of the pressing member provided in an embodiment of the present application.

[0090] Figure 21 A cross-sectional view of a compression member provided in an embodiment of the present application.

[0091] Figure 22 A cross-sectional view of a compression member provided in an embodiment of the present application having an extension portion.

[0092] Figure 23 A three-dimensional diagram of a first form of a pole provided in an embodiment of the present application.

[0093] Figure 24 A three-dimensional diagram of the second form of the pole provided in an embodiment of the present application.

[0094] Figure 25 This is a cross-sectional view of the third form of the pole provided in an embodiment of the present application.

[0095] Figure 26 This is a cross-sectional view of the fourth form of the pole provided in an embodiment of the present application.

[0096] Figure 27 This is a labeled diagram of the pole provided in an embodiment of the present application.

[0097] Figure 28 for Figure 14 A partial enlarged view of the first form at B in the middle.

[0098] Figure 29 for Figure 14 A partial enlarged view of the second form at B in the middle.

[0099] Figure 30 for Figure 14 A partial enlarged view of the third form at B in the middle.

[0100] Figure 31 for Figure 14 A partial enlarged view of the fourth form at B in the middle.

[0101] Figure 32 for Figure 14 A partial enlarged view of the fifth form at B in the middle.

[0102] The accompanying figures are:

[0103] 10. End cover assembly;

[0104] 100, pole assembly; 110, pole; 111, first metal layer; 1111, second groove; 112, second metal layer; 1121, third groove; 113, first flange; 114, second flange; 115, joint surface; 1151, first horizontal section; 1152, curved section; 1153, second horizontal section; 116, anti-torsion section;

[0105] 120, pressing member; 121, first groove; 122, first horizontal portion; 123, vertical portion; 124, second horizontal portion; 125, first protrusion; 126, through hole; 127, extension portion;

[0106] 130. Insulating seal; 131. First insulating portion; 1311. First insulator portion; 1312. Second insulator portion; 1323. Third insulator portion; 1324. Fourth insulator portion; 1325. Fifth insulator portion; 132. Sealing portion; 1321. First sealing segment; 1322. Second sealing segment; 1323. Third sealing segment; 1324. Fourth sealing segment; 1325. Fifth sealing segment; 1326. Sixth sealing segment; 1327. First sealing sub-portion; 1328. Second sealing sub-portion; 1329. Third sealing sub-portion; 133. Second insulating portion; 1331. Sixth insulator portion; 1332. Seventh insulator portion; 134. Section; 135. Snap-fit portion; 136. Snap-fit portion; 140. Recess;

[0107] 200, cover assembly; 210, mounting hole; 211, first mounting sub-hole; 212, second mounting sub-hole; 220, second raised portion; 230, metal part; 231, mounting groove; 2311, first vertical section; 2312, connecting section; 2313, second vertical section; 232, positioning protrusion; 240, plastic part; 241, third raised portion; 242, positioning groove; 243, fourth groove; 244, boss; 245, sink. DETAILED DESCRIPTION

[0108] 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.

[0109] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 12 and Figure 13The present invention provides an end cap assembly 10 including a terminal assembly 100 and a cover plate assembly 200. The terminal assembly 100 is applied to a battery. The terminal assembly 100 can be a negative electrode assembly. The terminal assembly 100 includes a terminal 110 and a pressing member 120. The pressing member 120 is fixedly connected to the cover plate assembly 200.

[0110] In this embodiment, see Figure 4 The pole 110 includes a first metal layer 111 and a second metal layer 112. The first metal layer 111 and the second metal layer 112 are bonded together, and the second metal layer 112 is closer to the core package than the first metal layer 111. The first metal layer 111 and the second metal layer 112 are made of different materials.

[0111] In this embodiment, see Figure 4 A first groove 121 is formed on the side of the pressing piece 120 facing the pole 110. The first groove 121 is adapted to the first metal layer 111 and the second metal layer 112 after bonding. The pressing piece 120 is sleeved on the pole 110, and the bonding surface 115 of the first metal layer 111 and the second metal layer 112 partially extends into the first groove 121. The pressing piece 120 presses against the two sides of the first metal layer 111 and the second metal layer 112 that are away from each other. For example, the upper side wall of the first groove 121 on the pressing piece 120 is located above the upper surface of the first metal layer 111, and the lower side wall of the first groove 121 on the pressing piece 120 is located below the lower surface of the second metal layer 112. The pressing piece 120 and the first metal layer 111 and the second metal layer 112 can be directly pressed or indirectly pressed. The pressing piece 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.

[0112] In the embodiment of the present application, the compression member 120 applies opposing forces to the bonding surface 115 of the first metal layer 111 and the second metal layer 112, respectively, forcing the first metal layer 111 and the second metal layer 112 into a tight fit. This increases the fit between the first metal layer 111 and the second metal layer 112. The compression member 120 restricts the upward or downward movement of the pole 110, thereby improving the mechanical properties of the pole 110. The pole assembly 100 has a relatively small number of components, a simple structure, and excellent sealing and insulation performance.

[0113] In some embodiments, see Figure 4The pole 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 provided 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 provided 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 upper edge of the second flange portion 114 is a cylindrical structure as are the first metal body and the second metal body. The first metal layer 111 and the second metal layer 112 are bonded together, and the first flange portion 113 is bonded to the second flange portion 114. The second metal layer 112 is closer to the core package than the first metal layer 111.

[0114] In this embodiment, see Figure 4 The first groove 121 is adapted to fit the first flange portion 113 and the second flange portion 114 after being attached. The first flange portion 113 and the second flange portion 114 at least partially extend into the first groove 121. The upper sidewall of the first groove 121 on the pressing member 120 is located above the upper surface of the first flange portion 113. The lower sidewall of the first groove 121 on the pressing member 120 is located below the lower surface of the second flange portion 114.

[0115] In the embodiment of the present application, the pressing member 120 presses the first flange portion 113 of the first metal layer 111 and the second flange portion 114 of the second metal layer 112, thereby pressing the first metal layer 111 and the second metal layer 112. This facilitates assembly of the first metal layer 111 and the second metal layer 112 with the pressing member 120, and the structure is simple.

[0116] In some embodiments, see Figure 4 , further comprising an insulating seal 130, which is arranged between the pole 110 and the pressing member 120. The insulating seal 130 satisfies both insulating and sealing functions. The pressing member 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 pressing member 120. For example, the upper side wall of the first groove 121 on the pressing member 120 and the surface of the first flange portion 113 are provided with the insulating seal 130, and the lower side wall of the first groove 121 on the pressing member 120 and the surface of the second flange portion 114 are provided with the insulating seal 130. The insulating seal 130 presses the first flange portion 113 and the second flange portion 114.

[0117] 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 the pressing member 120 and the insulating seal 130. The pressing member 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 fit together. The fitting force between the first metal layer 111 and the second metal layer 112 is increased. The pressing member 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 pressing member 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 a good sealing and insulating effect.

[0118] In some embodiments, see Figure 11 A plurality of recesses 140 are provided on the side of the pole 110 that contacts the insulating seal 130. Electrochemical etching can be used to form the recesses 140 on the surface of the pole 110. The recesses 140 are irregularly shaped. The bottom of the recesses 140 is larger than the slot opening. The insulating seal 130 fills the recesses 140. For example, an insulating sealing material is injected into the space between the pressing member 120 and the insulating seal 130, and protrusions are formed on the surface of the insulating seal 130 that mate with the recesses 140.

[0119] In this embodiment, the recess 140 on the pole 110 cooperates with the insulating seal 130 to form a mating, undercut structure. This eliminates any gap between the sealing surface of the pole 110 and the insulating seal 130, resulting in a compact structure. This improves the seal between the pole 110 and the insulating seal 130, as well as the bonding strength between the insulating seal 130 and the pole 110.

[0120] In some embodiments, see Figure 11 The side of the pressing member 120 that contacts the insulating seal 130 is provided with a plurality of recesses 140. Electrochemical etching can be used to form recesses 140 on the surface of the pressing member 120. The bottom of the recesses 140 is larger than the notch. The insulating seal 130 fills the recesses 140. For example, an insulating sealing material is injected into the space between the pressing member 120 and the insulating seal 130. Protrusions that mate with the recesses 140 are formed on the surface of the insulating seal 130.

[0121] In the embodiment of the present application, the pressing member 120 cooperates with the insulating seal 130 to form an interlocking undercut structure, thereby improving the sealing performance between the pressing member 120 and the insulating seal 130 and the bonding force between the insulating seal 130 and the pressing member 120 .

[0122] In some embodiments, see Figure 4The pressing member 120 includes a first horizontal portion 122, a vertical portion 123 and a second horizontal portion 124 connected in sequence. The first horizontal portion 122 and the second horizontal portion 124 are both annular structures. The first horizontal portion 122 and the second horizontal portion 124 have the same size. The vertical portion 123 is a cylindrical structure. The vertical portion 123 is located between the first horizontal portion 122 and the second horizontal portion 124, and the vertical portion 123 connects the first horizontal portion 122 and the second horizontal portion 124 at one end away from the pole 110. The first horizontal portion 122, the vertical portion 123 and the second horizontal portion 124 form a first groove 121. The second horizontal portion 124 is closer to the core package than the first horizontal portion 122. The first horizontal portion 122 is a certain distance from the upper surface of the first metal body, and the first horizontal portion 122 is located above the first flange portion 113. The second horizontal portion 124 is a certain distance from the lower surface of the second metal body, and the second horizontal portion 124 is located below the second flange portion 114.

[0123] For example, see Figure 2 and Figure 4 The cover assembly 200 includes a metal component 230 and a plastic component 240. The metal component 230 and the plastic component 240 are bonded together on the side facing away from the core package. The cover assembly 200 is provided with a mounting hole 210, which includes a first mounting sub-hole 211 and a second mounting sub-hole 212 that are arranged coaxially and extend through the cover assembly 200. The first mounting sub-hole 211 is provided on the metal component 230, and the sidewall of the first mounting sub-hole 211 is bonded to the side of the vertical portion 123 facing away from the pole 110. The second metal body is partially located within the second mounting sub-hole 212. The upper surface of the plastic component 240 supports the bottom of the pressing member 120.

[0124] In the embodiment of the present application, the pressing member 120 is composed of a first horizontal portion 122, a vertical portion 123, and a second horizontal portion 124. The first horizontal portion 122 is located on one side of the first flange portion 113, and the second horizontal portion 124 is located on one side of the second flange portion 114. A sealing portion is formed on the opposite sides of the first flange portion 113 and the second flange portion 114. The sealing portion is symmetrical, and the force applied to the sealing portion of the terminal is uniform, thereby improving the mechanical properties and sealing performance of the terminal.

[0125] In some embodiments, the first horizontal portion 122, the vertical portion 123, and the second horizontal portion 124 are integrally formed. The pressing member 120 can be integrally formed by stamping, bending, etc. The integral molding of the pressing member 120 simplifies the processing and improves the structural strength.

[0126] In some embodiments, see Figure 5 、 Figure 6 、 Figure 7 and Figure 9A first protrusion 125 is provided on the side of the vertical portion 123 facing away from the pole 110. The first protrusions 125 are arranged along the circumference of the vertical portion 123. A welding area is provided on the first protrusion 125. The first protrusion 125 is welded to the cover plate assembly 200. The welding of the first protrusion 125 to the cover plate assembly 200 facilitates installation.

[0127] In some embodiments, the first raised portion 125 is disposed at one end of the vertical portion 123 near the first horizontal portion 122. The side of the first raised portion 125 near the first horizontal portion 122 is flush with the upper surface of the first horizontal portion 122. The side of the first raised portion 125 near the second horizontal portion 124 is a welding area, and the first raised portion 125 is welded to the cover plate assembly 200.

[0128] Exemplarily, a side of the first protrusion 125 close to the second horizontal portion 124 is located above the metal member 230 , and a lower side surface of the first protrusion 125 is in contact with an upper surface of the metal member 230 around the first mounting sub-hole 211 .

[0129] In some embodiments, see Figure 5 and Figure 6 The first raised portion 125 is provided at one end of the vertical portion 123 near the second horizontal portion 124. The side surface of the first raised portion 125 near the second horizontal portion 124 is flush with the lower surface of the second horizontal portion 124. The side surface of the first raised portion 125 is a welding area, and the first raised portion 125 is welded to the cover plate assembly 200.

[0130] For example, see Figure 5 and Figure 6 The wall of the first mounting sub-hole 211 is stepped, with the diameter of the first mounting sub-hole 211 at one end closer to the upper surface of the metal component 230 being smaller than that at the other end. The first protrusion 125 is located within the first mounting sub-hole 211, with the wall of the first mounting sub-hole 211 in contact with the first protrusion 125. The sidewall of the first mounting sub-hole 211 of the metal component 230 compresses the first protrusion 125, limiting the movement of the compression member 120 and improving its mechanical properties.

[0131] In some embodiments, see Figure 7 and Figure 9 The first raised portion 125 is located near the middle of the vertical portion 123. The upper surface of the first raised portion 125 is spaced a certain distance from the upper surface of the first horizontal portion 122, and the lower surface of the first raised portion 125 is spaced a certain distance from the lower surface of the second horizontal portion 124. The distance between the upper surface of the first raised portion 125 and the upper surface of the first horizontal portion 122 is greater than the distance between the lower surface of the first raised portion 125 and the lower surface of the second horizontal portion 124. The side surface of the first raised portion 125 serves as a welding area.

[0132] For example, see Figure 7 and Figure 9 The wall of the first mounting sub-hole 211 is stepped, and the first protrusion 125 and the side surface of the compression member 120 below the first protrusion 125 are in contact with the wall of the first mounting sub-hole 211. The side of the first protrusion 125 near the first horizontal portion 122 is flush with the upper surface of the metal member 230. The side wall of the mounting hole 210 on the cover assembly 200, through which the pole assembly 100 is mounted, has a step corresponding to the side wall of the first protrusion 125 and the vertical portion 123 below the first protrusion 125, facilitating the installation of the compression member 120 and limiting its movement.

[0133] In some embodiments, see Figure 18 、 Figure 19 and Figure 20 The pressing member 120 is provided with a plurality of through holes 126 , which are spaced apart along the circumference of the pressing member 120 . The through holes 126 are communicated with the first groove 121 , and the insulating sealing member 130 fills the through holes 126 .

[0134] In the embodiment of the present application, a through hole 126 is provided in the compression member 120, which extends through the inside and outside of the compression member 120. Accordingly, the portion of the insulating seal 130 located within the through hole 126 connects to the insulating seal 130 on the inside and outside of the compression member 120. This improves the connection stability between the insulating seal 130 and the compression member 120, improves the twisting, pushing, and pulling between the insulating seal 130 and the compression member 120, and reduces the probability of the compression member 120 becoming uneven due to material deformation.

[0135] In some embodiments, the through holes 126 are arranged at equal intervals along the circumference of the pressing member 120. For example, four through holes 126 are provided, and the four through holes 126 are respectively arranged at quadrant points of the circle where the pressing member 120 is located.

[0136] In the embodiment of the present application, the through holes 126 are arranged at equal intervals along the circumference of the pressing member 120, and the pressing member 120 is evenly subjected to the force of the insulating seal 130 in the circumferential direction. The insulating seal 130 and the pressing member 120 have strong anti-twisting ability.

[0137] In some embodiments, see Figure 18 A through hole 126 is defined on the vertical portion 123 , and the through hole 126 extends along the radial direction of the pressing member 120 .

[0138] In the embodiment of the present application, the through hole 126 extends along the radial direction of the pressing member 120 , thereby improving the anti-torsion capability of the pressing member 120 and limiting the axial movement of the pressing member 120 .

[0139] In some embodiments, see Figure 19 and Figure 20A through hole 126 is defined in the first horizontal portion 122, extending axially along the compression member 120. For example, the through hole 126 can be provided on the side of the first horizontal portion 122 facing away from the vertical portion 123. Alternatively, the through hole 126 can be provided at the junction of the first horizontal portion 122 and the vertical portion 123. This improves the torsional resistance of the compression member 120.

[0140] In some embodiments, see Figure 21 Along the axial direction of the pressing member 120, the height of the first horizontal portion 122 is h1, and the height between the opposite sides of the first horizontal portion 122 and the second horizontal portion 124 is H, which satisfies at least one of the following conditions: 0.1 mm ≤ h1 ≤ 2 mm; 2h1 < H ≤ 2h1 + 5. The value of h1 can be 0.1 mm, 0.5 mm, 0.8 mm, 1.3 mm, 1.6 mm, 2 mm, or other unspecified values.

[0141] In the embodiment of the present application, the first horizontal portion 122 of the pressing member 120 is associated with the overall size of the pressing member 120 and is reasonably designed to avoid the pressing member 120 being too large, resulting in a high volume utilization rate of the battery.

[0142] In some embodiments, along the axial direction of the pressing member 120, the height of the first horizontal portion 122 is h1, where 5 MPa / mm≤P / h1≤5000 MPa / mm, and P is the strength of the pressing member 120. The value of P / h1 can be 5 MPa / mm, 150 MPa / mm, 400 MPa / mm, 700 MPa / mm, 1000 MPa / mm, 1400 MPa / mm, 1900 MPa / mm, 2200 MPa / mm, 2700 MPa / mm, 3100 MPa / mm, 3500 MPa / mm, 3900 MPa / mm, 4100 MPa / mm, 4600 MPa / mm, 4800 MPa / mm, 5000 MPa / mm, or other values not specified.

[0143] In the embodiment of the present application, the strength of the pressing member 120 is correlated with the height of the first horizontal portion 122. The material of the pressing member 120 can be selected based on the height of the first horizontal portion 122, or the height of the first horizontal portion 122 can be designed based on the material of the pressing member 120. This ensures that the size and strength of the pressing member 120 meet the design requirements.

[0144] In some embodiments, 2.5 N / mm 3 ≤HB / h1≤4000N / mm 3 HB is the hardness of the pressing member 120. The value of HB / h1 can be 2.5N / mm 3 , 50N / mm 3 , 90N / mm 3, 140N / mm 3 , 280N / mm 3 、350N / mm 3 , 400N / mm 3 , 560N / mm 3 、690N / mm 3 , 800N / mm 3 , 960N / mm 3 , 1300N / mm 3 , 1800N / mm 3 , 2600N / mm 3 、3200N / mm 3 、3400N / mm 3 、3500N / mm 3 、3900N / mm 3 、3910N / mm 3 , 4000N / mm 3 Or other unspecified values.

[0145] In the embodiment of the present application, the hardness of the pressing member 120 is correlated with the height of the first horizontal portion 122. The material of the pressing member 120 can be selected based on the height of the first horizontal portion 122, or the height of the first horizontal portion 122 can be designed based on the material of the pressing member 120. This ensures that the size and hardness of the pressing member 120 meet the design requirements.

[0146] In some embodiments, see Figure 8 and Figure 22 The pressing member 120 further includes an extension portion 127 , which is disposed at an end of the second horizontal portion 124 away from the vertical portion 123 , and extends toward a side away from the first horizontal portion 122 .

[0147] For example, see Figure 8 The cover assembly 200 includes a metal part 230 and a plastic part 240, and the metal part 230 is bonded to the side of the plastic part 240 facing away from the core package. The cover assembly 200 is provided with a mounting hole 210, and the mounting hole 210 includes a first mounting sub-hole 211 and a second mounting sub-hole 212 that are through and coaxially arranged. The first mounting sub-hole 211 is provided on the metal part 230, and the side wall of the first mounting sub-hole 211 has a step structure that is adapted to the vertical portion 123 and the second horizontal portion 124 of the pressing member 120. The first horizontal portion 122 is located above the metal part 230. The second mounting sub-hole 212 is provided on the plastic part 240, and the aperture of the first mounting sub-hole 211 is larger than the aperture of the second mounting sub-hole 212. The side wall of the second mounting sub-hole 212 is bonded to part of the side wall of the pole 110. An end of the extending portion 127 facing away from the first horizontal portion 122 abuts against a side surface of the plastic component 240 close to the metal component 230 .

[0148] In this embodiment of the present application, the compression member 120 includes a first horizontal portion 122, a vertical portion 123, a second horizontal portion 124, and an extension portion 127, which are connected in sequence. The extension portion 127 and the second horizontal portion 124 form a support area, which is in close contact with the metal member 230 and is welded to the metal member 230. This facilitates the assembly and fixation of the compression member 120 and the cover assembly 200, improving the laser welding yield.

[0149] In some embodiments, see Figure 22 Along the axial direction of the pressing member 120, the height of the first horizontal portion 122 is h1, the height between the opposite sides of the first horizontal portion 122 and the second horizontal portion 124 is H, and the height of the extension portion 127 is h2, and at least one of the following conditions is satisfied: 0.1mm≤h1≤2mm; 2h1<H≤2h1+5; 0<h2≤5mm. Among them, the value of h1 is 0.1mm, 0.5mm, 0.8mm, 1.3mm, 1.6mm, 2mm or other unlisted values. The value of h2 is 0.1mm, 0.9mm, 1.2mm, 1.8mm, 2.1mm, 3.5mm, 4.1mm, 4.8mm, 5mm or other unlisted values.

[0150] In some embodiments, Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 and Figure 17 The insulating seal 130 includes a first insulating portion 131, a sealing portion 132 and a second insulating portion 133. The first insulating portion 131, the sealing portion 132 and the second insulating portion 133 are separate structures. The hardness of the first insulating portion 131 and the second insulating portion 133 is greater than the hardness of the sealing portion 132. Along the axial direction of the pole, the sealing portion 132 is located between the first insulating portion 131 and the second insulating portion 133. The first insulating portion 131 is in contact with the side surface of the first metal layer 111, the second insulating portion 133 is in contact with the side surface of the second metal layer 112, and the sealing portion 132 is sealed and connected to the first flange portion 113 and / or the second flange portion 114.

[0151] In some embodiments, a portion of the insulating seal 130 is in contact with a side of the pressing member 120 facing away from the pole 110 .

[0152] In some embodiments, a portion of the insulating seal 130 is in contact with a side surface of the pressing member 120 close to the core package.

[0153] For example, see Figure 15The first insulating portion 131 includes a first insulator portion 1311, a second insulator portion 1312, and a third insulator portion 1313 connected in sequence. The first insulator portion 1311 and the third insulator portion 1313 are arranged vertically, and the second insulator portion 1312 is arranged horizontally. The first insulator portion 1311 is in contact with the side surface of the first metal layer 111 located above the first flange portion 113 and the end of the first horizontal portion 122. The second insulator portion 1312 is in contact with the inner side surface of the first horizontal portion 122 and the side surface of the first flange portion 113 facing away from the second flange portion 114. The third insulator portion 1313 is in contact with the inner side surface of the vertical portion 123 and the end surface of the first flange portion 113. The sealing portion 132 is in contact with the side surface of the second flange portion 114 facing away from the first flange portion 113 and the inner side surface of the second horizontal portion 124. The second insulating portion 133 is in contact with the end surface of the second flange portion 114 and the side surface of the second metal layer 112 below the second flange portion 114. The first insulating portion 131 and the sealing portion 132 clamp the first and second flange portions 113 and 114, applying opposing forces to the first and second flange portions 113 and 114 to ensure the bonding strength between the first and second metal layers 111 and 112.

[0154] See also Figure 15 The first insulating portion 131 also includes a fourth insulator portion 1314 and a fifth insulator portion 1315. The fourth insulator portion 1314 is in contact with the side of the first horizontal portion 122 that faces away from the second horizontal portion 124. The fourth insulator portion 1314 is located between the third insulator portion 1313 and the fifth insulator portion 1315. The fourth insulator portion 1314 connects the third insulator portion 1313 and the fifth insulator portion 1315. The fifth insulator portion 1315 is in contact with the side of the vertical portion 123 that faces away from the pole 110. The provision of the fourth insulator portion 1314 and the fifth insulator portion 1315 increases the creepage distance between the pole 110 and the cover body cover assembly 200, thereby improving the insulation effect. The first insulator portion 1311, the second insulator portion 1312, the third insulator portion 1313, the fourth insulator portion 1314, and the fifth insulator portion 1315 are integrally formed. The first insulating portion 131 can be formed by injection molding and then assembled with the pole 110 and the pressing piece 120. Alternatively, the first insulating portion 131 can be integrally formed by injection molding after the pressing piece 120 is assembled with the pole 110. The first insulating portion 131 has a simple structure and is easy to process.

[0155] See also Figure 15The second insulating part 133 includes a sixth insulator part 1331 and a seventh insulator part 1332, and the sixth insulator part 1331 and the seventh insulator part 1332 are connected. The sixth insulator part 1331 is bonded to the second horizontal part 124 and the second metal layer 112. The seventh insulator part 1332 is located on the side of the second horizontal part 124 away from the first horizontal part 122, and the seventh insulator part 1332 is bonded to the lower surface of the second horizontal part 124. The sixth insulator part 1331 and the seventh insulator part 1332 are integrally formed. The sixth insulator part 1331 and the seventh insulator part 1332 can be processed and formed by injection molding. The second insulating part 133 increases the creepage distance between the pole 110 and the cover body cover assembly 200, thereby improving the insulation effect.

[0156] For example, see Figure 16 The sealing portion 132 includes a first sealing sub-portion 1327, a second sealing sub-portion 1328, and a third sealing sub-portion 1329 connected in sequence. The first sealing sub-portion 1327 is in contact with the inner side surface of the first horizontal portion 122 and the side surface of the first flange portion 113 facing away from the second flange portion 114. The third sealing sub-portion 1329 is in contact with the side surface of the second flange portion 114 facing away from the first flange portion 113 and the inner side surface of the second horizontal portion 124. The second sealing sub-portion 1328 is in contact with the end surface of the first flange portion 113, the end surface of the second flange portion 114, and the inner side surface of the vertical portion 123. The first insulating portion 131 is located on the side of the first sealing sub-portion 1327 facing away from the second sealing sub-portion 1328. The second insulating portion 133 is located on the side of the third sealing sub-portion 1329 facing away from the second sealing sub-portion 1328. The first sealing sub-section 1327 and the third sealing sub-section 1329 clamp the first flange 113 and the second flange 114, applying opposing forces to the first and second flanges 113 and 114 to ensure the bonding strength between the first and second metal layers 111 and 112. The first sealing sub-section 1327, the second sealing sub-section 1328, and the third sealing sub-section 1329 are integrally formed and can be formed using an injection molding process.

[0157] For example, see Figure 17The first insulating portion 131 is in contact with the side surface of the first metal layer 111 above the first flange portion 113 and the end of the first horizontal portion 122. The sealing portion 132 is in contact with the inner side surface of the first horizontal portion 122 and the side surface of the first flange portion 113 facing away from the second flange portion 114. The sealing portion 132 is also in contact with the inner side surface of the vertical portion 123 and the end surface of the first flange portion 113. The second insulating portion 133 is in contact with the side surface of the second flange portion 114 facing away from the first flange portion 113 and the inner side surface of the second horizontal portion 124. The second insulating portion 133 is also in contact with the end surface of the second flange portion 114 and the side surface of the second metal layer 112 below the second flange portion 114. The second insulating portion 133 and the sealing portion 132 clamp the first flange portion 113 and the second flange portion 114, and apply opposite forces to the first flange portion 113 and the second flange portion 114 to ensure the bonding strength between the first metal layer 111 and the second metal layer 112. Figure 4 、 Figure 8 , the insulating seal 130 is integrally formed.

[0158] The insulating seal 130 includes a first insulating portion 131 and a sealing portion 132, which are connected in sequence. The sealing portion 132 is located between the compression member 120 and the pole 110. The side of the sealing portion 132 near the compression member 120 is contoured to match the inner sidewall of the compression member 120, while the side of the sealing portion 132 near the pole 110 is contoured to match the side of the pole 110. The first insulating portion 131 extends from one end of the sealing portion 132, through the end of the compression member 120, and to the side of the compression member 120 facing away from the pole 110.

[0159] Exemplarily, a portion of the first insulating portion 131 is located at an end of the compression member 120 facing away from the core package. The first insulating portion 131 extends along the surface of the compression member 120. Another portion of the first insulating portion 131 is located on the side of the compression member 120. The first insulating portion 131 is bent. The shape of the first insulating portion 131 is adapted to the outer surface of the compression member 120. The end of the first insulating portion 131 extends to the side of the cover plate assembly 200 facing away from the core package, or extends into the mounting hole 210 on the cover plate assembly 200.

[0160] In the embodiment of the present application, the insulating seal 130 includes a first insulating portion 131 and a sealing portion 132 connected in sequence. The sealing portion 132 is located between the pressing member 120 and the pole 110 to achieve an insulating seal between the pressing member 120 and the pole 110. The first insulating portion 131 extends from one end of the sealing portion 132 to the side of the pressing member 120, extending the creepage distance and improving the insulation performance. Figure 4 and Figure 5The insulating seal 130 further includes a second insulating portion 133 , which is located on a side of the sealing portion 132 away from the first insulating portion 131 . The second insulating portion 133 is connected to the sealing portion 132 and extends toward a side away from the pole 110 .

[0161] For example, see Figure 4 and Figure 5 , along the axis of the pole 110, the pole 110 has three cylindrical structures from top to bottom, namely the first cylindrical structure, the second cylindrical structure and the third cylindrical structure. The first cylindrical structure is located above the plane where the first flange portion 113 is located, the second cylindrical structure is located below the plane where the second flange portion 114 is located, and the third cylindrical structure is located on the side of the second cylindrical structure away from the second flange portion 114. The diameters of the first cylindrical structure and the second cylindrical structure are the same. Or the diameter of the first cylindrical structure is larger than the diameter of the second cylindrical structure. The diameter of the third cylindrical structure is smaller than the diameters of the other two cylindrical structures. The insulating seal 130 includes a first insulating portion 131, a sealing portion 132 and a second insulating portion 133. The upper surface of the first insulating portion 131 is flush with or slightly lower than the upper surface of the pole 110, and the lower surface of the second insulating portion 133 is flush with or slightly higher than the lower end of the second cylindrical structure.

[0162] Correspondingly, the cover assembly 200 includes a metal part 230 and a plastic part 240. The metal part 230 is located on the side of the plastic part 240 away from the core package, and the metal part 230 is fixedly connected to the plastic part 240. The mounting hole 210 includes a first mounting sub-hole 211 and a second mounting sub-hole 212 that are through and coaxially arranged. The first mounting sub-hole 211 is arranged on the metal part 230. The aperture of the first mounting sub-hole 211 is adapted to the outer diameter of the clamping part 120. The end of the first insulating part 131 is located between the clamping part 120 and the hole wall of the first mounting sub-hole 211. The second mounting sub-hole 212 is arranged on the plastic part 240. The aperture of the first mounting sub-hole 211 is larger than the aperture of the second mounting sub-hole 212. The side wall of the second mounting sub-hole 212 is stepped, the end face 134 of the second insulating portion 133 is in contact with a section of the side wall of the second mounting sub-hole 212 close to the first mounting sub-hole 211, and the third cylindrical structure of the pole 110 is in contact with a section of the side wall of the second mounting sub-hole 212 away from the first mounting sub-hole 211.

[0163] In the embodiment of the present application, the first insulating portion 131 and the second insulating portion 133 are provided to increase the creepage distance between the pole 110 and the metal member 230 diameter, thereby improving the insulation performance.

[0164] In some embodiments, see Figure 5The insulating seal 130 is tilted away from the end surface 134 of the pole 110. For example, the second insulating portion 133 is tilted away from the end surface 134 of the pole 110, and the end surface 134 is configured to mate with the cover assembly 200. Correspondingly, the second mounting sub-hole 212 is tilted toward a section of the sidewall adjacent to the first mounting sub-hole 211.

[0165] In the embodiment of the present application, the contact area between the second insulating portion 133 and the plastic component 240 is large, and the second insulating portion 133 and the plastic component 240 are tightly fitted, thereby improving the high-voltage insulation performance.

[0166] In some embodiments, see Figure 5 The inclination angle of end face 134 is a, where 0°<a≤100°. The value of a can be 10°, 18°, 25°, 33°, 39°, 45°, 51°, 60°, 72°, 83°, 91°, 100°, or other unspecified values. The inclination angle of end face 134 is rationally designed to facilitate processing and ensure wedge-shaped contact between second insulating portion 133 and plastic component 240.

[0167] In some embodiments, see Figure 10 The insulating seal 130 has a snap-fit portion 135 on the side closest to the core package. For example, the second insulating portion 133 has a snap-fit portion 135 on the side facing away from the compression member 120. The snap-fit portion 135 is configured to snap-fit with a snap-fit portion 136 on the cover assembly 200. The snap-fit portion 135 is a first groove and / or protrusion structure provided on the compression member 120. Correspondingly, the snap-fit portion 133 is a protrusion and / or first groove structure provided on the plastic component 240. The second insulating portion 133 and the plastic component 240 form a mutually interlocking structure, improving high-voltage insulation performance.

[0168] In some embodiments, see Figure 4The sealing portion 132 includes a first sealing segment 1321, a second sealing segment 1322, a third sealing segment 1323, a fourth sealing segment 1324, and a fifth sealing segment 1325, which are connected in sequence. The first sealing segment 1321, the third sealing segment 1323, and the fifth sealing segment 1325 extend axially along the pressing member 120. The first sealing segment 1321 is closer to the axis of the pressing member 120 than the third sealing segment 1323, and the fifth sealing segment 1325 is closer to the axis of the pressing member 120 than the first sealing segment 1321. The second sealing segment 1322 and the fourth sealing segment 1324 extend in a direction perpendicular to the axis of the pressing member 120. Correspondingly, the first sealing segment 1321 is fitted with the side of the first cylindrical structure of the pole 110 to form a seal, the second sealing segment 1322, the third sealing segment 1323 and the fourth sealing segment 1324 are fitted with the surface after the first flange portion 113 and the second flange portion 114 on the pole 110 are fitted to form a seal, and the fifth sealing segment 1325 is fitted with the side of the second cylindrical structure of the pole 110 to form a seal.

[0169] In the embodiment of the present application, the sealing portion 132 includes a first sealing segment 1321, a second sealing segment 1322, a third sealing segment 1323, a fourth sealing segment 1324, and a fifth sealing segment 1325, which are connected in sequence. The sealing portion 132 is adapted to the side shape of the terminal 110. The sealing portion 132 provides a large insulation sealing area on the side of the terminal 110, thereby achieving a good insulation sealing effect.

[0170] In some embodiments, see Figure 8 The sealing portion 132 includes a first sealing segment 1321, a second sealing segment 1322, a third sealing segment 1323, a fourth sealing segment 1324, a fifth sealing segment 1325, and a sixth sealing segment 1326, which are connected in sequence. The first sealing segment 1321, the third sealing segment 1323, and the fifth sealing segment 1325 extend axially along the compression member 120. The first sealing segment 1321 is closer to the axis of the compression member 120 than the third sealing segment 1323, and the fifth sealing segment 1325 is closer to the axis of the compression member 120 than the first sealing segment 1321. The second sealing segment 1322, the fourth sealing segment 1324, and the sixth sealing segment 1326 extend in a direction perpendicular to the axis of the compression member 120. The sixth sealing segment 1326 is closer to the axis of the compression member 120 than the fourth sealing segment 1324.

[0171] In the embodiment of the present application, the sealing portion 132 includes a first sealing segment 1321, a second sealing segment 1322, a third sealing segment 1323, a fourth sealing segment 1324, a fifth sealing segment 1325, and a sixth sealing segment 1326, which are connected in sequence. The sealing portion 132 is adapted to the side shape of the terminal 110, and the sealing portion 132 provides a large insulation sealing area on the side of the terminal 110, thereby achieving a good insulation sealing effect.

[0172] In some embodiments, the insulating seal 130 is formed by an injection molding process. During the manufacturing process, after the pressing member 120 is welded to the cover assembly 200, the pressing member 120 is sleeved on the pole 110, and then the insulating seal 130 is formed by an injection molding process.

[0173] In the embodiment of the present application, the insulating seal 130 is formed by an injection molding process, has a high degree of compatibility with the pole 110 and the pressing member 120, has a good insulating and sealing effect, and is simple to process.

[0174] In some embodiments, the insulating seal 130 includes one of a PPS (polyphenylene sulfide) insulating seal, a PP (polypropylene) insulating seal, a PBT (polybutylene terephthalate) insulating seal, or a PFA (soluble polytetrafluoroethylene) insulating seal. The insulating seal 130 can be made of a variety of materials and has good insulation and sealing properties.

[0175] In some embodiments, the hardness of the insulating seal 130 is HS, wherein 20HA≤HS≤95HA. The value of HS can be 20HA, 31HA, 35HA, 57HA, 64HA, 77HA, 84HA, 90HA, 95HA, or other unspecified values.

[0176] In the embodiment of the present application, the hardness range of the insulating seal 130 is set to 20HA to 95HA to meet the mechanical performance requirements and sealing insulation of the insulating seal 130.

[0177] In some embodiments, see Figure 23 , an anti-torsion portion 116 is provided on the pole 110, and an anti-torsion matching portion is provided on the insulating seal 130, and the anti-torsion portion 116 is embedded in 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 embedded in the protrusion structure. As a variation, the anti-torsion portion 116 is a first groove structure, and the anti-torsion matching portion is a protrusion structure. Alternatively, the anti-torsion portion 116 includes a first groove structure and a protrusion structure, and the anti-torsion matching portion includes a protrusion structure and a first groove structure.

[0178] 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.

[0179] In some embodiments, a traceability code is provided on the end surface of the pole 110 near the core package. This code can be a QR code or a barcode. Scanning the code with a barcode scanner provides basic information about the pole. This information includes binding information between the pole 110 and the cover assembly 200, manufacturer information, production batch information, and more. This facilitates traceability of information about the pole 110.

[0180] In some embodiments, see Figure 24 and 25 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.

[0181] In some embodiments, the second metal layer 112 and the first metal layer 111 are made of different materials, and the second metal layer 112 and the first metal layer 111 are an integrated composite member; or, the second metal layer 112 and the first metal layer 111 are made of different materials, and the second metal layer 112 and the first metal layer 111 are separately arranged, and the second metal layer 112 and the first metal layer 111 are embedded.

[0182] Exemplarily, the pole 110 is a composite part 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. In other embodiments, before the pole 110 is formed by cold heading, the first metal layer 111 and the second metal layer 112 are separate structures, and the first metal layer 111 and the second metal layer 112 are embedded in each other through the cold heading process.

[0183] 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.

[0184] In some embodiments, see Figure 27Along 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 .

[0185] 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.

[0186] In some embodiments, see Figure 26 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 core package than the first horizontal segment 1151, and the curved segment 1152 bends away from the second horizontal segment 1153.

[0187] 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 helps reduce 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.

[0188] In some embodiments, see Figure 25 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 .

[0189] 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.

[0190] In some embodiments, see Figure 25The bottom of the second groove 1111 on the first metal layer 111 is closer to the core package 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.

[0191] In some embodiments, see Figure 27 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.

[0192] In some embodiments, see Figure 27 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.

[0193] In some embodiments, see Figure 26 A 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 in the second metal layer 112, during the cold forging process, the material originally in the third groove 1121 is forged and pressed to other locations in the second metal layer 112. The diameter of the second metal layer 112 is increased through isovolumetric forming, thereby reducing the material content of the second metal layer 112, thereby reducing the weight of the pole 110 and reducing the cost of the pole 110.

[0194] In some embodiments, see Figure 26 , 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.

[0195] In some embodiments, see Figure 27The 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.

[0196] 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 pressing member 120 and the insulating seal 130.

[0197] In some embodiments, see Figure 27 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.

[0198] In some embodiments, see Figure 27 , 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.

[0199] In some embodiments, see Figure 27The 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 core package is t3, where 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 core package 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.

[0200] In some embodiments, see Figure 2 and Figure 3 The pressing member 120 is welded and fixed to the side wall of the mounting hole 210 on the cover assembly 200 .

[0201] In the embodiment of the present application, the compression member 120 is welded to the cover plate assembly 200. The assembled compression member 120 and the cover plate assembly 200 provide excellent stability and structural strength. The compression member 120 limits the upper surface of the first flange portion 113 and the lower surface of the second flange portion 114 of the pole 110, resulting in a low sealing compression force and improved mechanical properties of the assembled pole assembly 100 and the cover plate assembly 200.

[0202] In some embodiments, see Figure 9 A second protrusion 220 is provided on the side of the cover plate assembly 200 facing away from the core package. The second protrusion 220 is located around the mounting hole 210. Along the axial direction of the pole 110, the surface of the second protrusion 220 is higher than the side of the second flange portion 114 near the core package. One end of the insulating seal 130 extends between the second protrusion 220 and the pressing member 120. For example, the first insulating portion 131 extends between the second protrusion 220 and the pressing member 120, and the first insulating portion 131 is in contact with the wall of the mounting hole 210 and the side wall of the pressing member 120.

[0203] In the embodiment of the present application, by providing the second protrusion 220, the depth of the mounting hole 210 is increased, thereby increasing the depth of the pressing member 120 in the mounting hole 210, so that the battery's electrode liquid can extend into the interior of the electrode, thereby improving the corrosion resistance of the battery.

[0204] In some embodiments, see Figure 13The cover plate assembly 200 includes 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 core pack and is connected to the plastic component 240. The metal component 230 is a plain aluminum sheet, and the plastic component 240 is a plastic plate. Taking a prismatic battery as an example, both the metal component 230 and the plastic component 240 are rectangular plate structures. The plastic component 240 is used to isolate the metal component 230 from the core pack, improving battery safety.

[0205] In some embodiments, see Figure 13 and Figure 28 The metal member 230 has a mounting groove 231 on the side facing the plastic member 240. The mounting groove 231 is disposed between the end of the metal member 230 and the pole assembly 100. The number of mounting grooves 231 on one end of the metal member 230 can be one or two. The opening of the mounting groove 231 is smaller than the bottom of the mounting groove 231, i.e., the mounting groove 231 has a tapered structure. The plastic member 240 has a third protrusion 241 on the side facing the metal member 230. The third protrusion 241 is fixed within the mounting groove 231.

[0206] In the embodiment of the present application, the metal part 230 and the plastic part 240 are pressed together, and the third protrusion 241 and the groove wall of the installation groove 231 form a snap-fit structure. The installation operation is simple, and the metal part 230 and the plastic part 240 are not easy to fall off, thereby achieving effective combination of the metal part 230 and the plastic part 240.

[0207] In some embodiments, see Figure 30 The bottom of the mounting groove 231 on the metal component 230 is provided with a positioning protrusion 232. The size of the positioning protrusion 232 is smaller than the size of the groove bottom. The positioning protrusion 232 protrudes toward the notch of the mounting groove 231. The side of the third protrusion 241 that contacts the groove bottom is provided with a positioning groove that mates with the positioning protrusion 232. The metal component 230 is connected to the plastic component 240 in a fixed manner, and the third protrusion 241 is located in the positioning groove.

[0208] In the embodiment of the present application, by setting a positioning protrusion 232 at the bottom of the installation groove 231, it is beneficial for the injection material filled in the installation groove 231 to flow when the plastic part 240 is injection molded, so that the third protrusion fits with the groove wall of the installation groove 231, thereby ensuring the connection strength between the metal part 230 and the plastic part 240.

[0209] In some embodiments, see Figure 30Positioning protrusion 232 is coaxially disposed with mounting groove 231. Positioning protrusion 232 is frustum-shaped. The dimension of the end of positioning protrusion 232 closest to the notch of mounting groove 231 is smaller than the dimension of the opposite end. Positioning protrusion 232 is coaxially disposed with mounting groove 231, allowing the injection molding in mounting groove 231 to flow evenly around the periphery. The third protrusion is in close contact with the groove wall of mounting groove 231, thus improving the connection between metal component 230 and plastic component 240.

[0210] In some embodiments, see Figure 28 The cross-section of the mounting groove 231 is in the shape of an inverted trapezoid along the thickness direction of the metal member 230. The mounting groove 231 has a simple structure and is easy to process.

[0211] In some embodiments, see Figure 29 The sidewall of the mounting groove 231 includes a first vertical section 2311, a connecting section 2312, and a second vertical section 2313, which are connected in sequence. The first vertical section 2311 is closer to the bottom of the mounting groove 231 than the second vertical section 2313, while the second vertical section 2313 is closer to the axis of the mounting groove 231 than the first vertical section 2311. The first vertical section 2311, the connecting section 2312, and the second vertical section 2313 are coaxially arranged. The second vertical section 2313 and the connecting section 2312 form a right-angled concave structure, which effectively interlocks the groove wall of the mounting groove 231 with the third protrusion.

[0212] In some embodiments, see Figure 30 A fourth groove 243 is defined on the side of the metal component 230 facing the plastic component 240. The fourth groove 243 is disposed along the circumference of the mounting groove 231. The fourth groove 243 may be an annular groove, coaxially disposed with the mounting groove 231, and located outside the mounting groove 231. The depth of the fourth groove 243 is less than that of the mounting groove 231. The depth of the fourth groove 243 is also less than that of the mounting groove 231.

[0213] In the embodiment of the present application, when the metal part 230 and the plastic part 240 are assembled, by setting the fourth groove 243, when the third protrusion enters the installation groove 231, the side wall of the installation groove 231 is deformed toward the side of the fourth groove 243. The fourth installation groove 231 provides a deformation space, which is conducive to the installation of the third protrusion. After the third protrusion is installed, the installation groove 231 restores its deformation to form an inverted structure with the third protrusion.

[0214] In some embodiments, see Figure 31A boss 244 is provided on the side of the metal member 230 facing away from the plastic member 240. Along the thickness direction of the metal member 230, the projection of the mounting groove 231 lies within the projection of the boss 244. When the mounting groove 231 is machined into the metal member 230, the boss 244 is formed on the side of the metal member 230 facing away from the plastic member 240. The boss 244 is larger than the projection of the mounting groove 231.

[0215] In some embodiments, see Figure 31 The distance between the surface of boss 244 facing away from metal component 230 and the surface of metal component 230 facing away from plastic component 240 is L2, where 0 < L2 ≤ 0.5 mm. The value of L2 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or other values not specified. The maximum value of L2 is 0.5 mm, which does not affect battery assembly.

[0216] In some embodiments, see Figure 32 A recessed platform 245 is provided on the side of the metal component 230 facing away from the plastic component 240. Along the thickness of the metal component 230, the projection of the mounting groove 231 lies within the projection of the recessed platform 245. When the mounting groove 231 is machined into the metal component 230, a boss 244 is formed on the side of the metal component 230 facing away from the plastic component 240. The boss 244 is then machined to form the recessed platform 245, preventing the boss 244 from interfering with battery assembly.

[0217] An embodiment of the present application further provides a battery, comprising the end cap assembly 10 of the above embodiment.

[0218] 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.

[0219] 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.

[0220] The end cap assembly and battery provided in the embodiments of the present application are introduced in detail above. 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, according to 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. An end cap assembly (10), characterized in that: include: A pole assembly (100), the pole assembly (100) comprising a pole (110) and a pressing piece (120), the pole (110) comprising a first metal layer (111) and a second metal layer (112), the first metal layer (111) being connected to the second metal layer (112), a first groove (121) being formed on a side of the pressing piece (120) facing the pole (110), a bonding surface (115) of the first metal layer (111) and the second metal layer (112) being located in the first groove (121), and the pressing piece (120) pressing against two sides of the first metal layer (111) and the second metal layer (112) facing away from each other; The cover plate assembly (200) is fixedly connected to the pressing member (120).

2. The end cap assembly (10) according to claim 1, characterized in that The pressing member (120) includes a first horizontal portion (122), a vertical portion (123), and a second horizontal portion (124) connected in sequence, wherein the vertical portion (123) is located between the first horizontal portion (122) and the second horizontal portion (124), and the vertical portion (123) connects the first horizontal portion (122) and the second horizontal portion (124) at one end facing away from the pole (110).

3. The end cap assembly (10) according to claim 2, characterized in that The first horizontal portion (122), the vertical portion (123) and the second horizontal portion (124) are integrally formed.

4. The end cap assembly (10) according to claim 2, characterized in that A first protruding portion (125) is provided on a side of the vertical portion (123) facing away from the pole (110), and a welding area is provided on the first protruding portion (125).

5. The end cap assembly (10) according to claim 4, characterized in that The first protrusion (125) is provided at one end of the vertical portion (123) close to the first horizontal portion (122); Alternatively, the first protruding portion (125) is provided at one end of the vertical portion (123) close to the second horizontal portion (124); Alternatively, the first protrusion (125) is arranged in an area close to the middle of the vertical portion (123).

6. The end cap assembly (10) according to claim 2, characterized in that Along the axial direction of the pressing member (120), the height of the first horizontal portion (122) is h1, and the height between the opposite sides of the first horizontal portion (122) and the second horizontal portion (124) is H, which satisfies at least one of the following conditions: 0.1mm≤h1≤2mm; 2h1<H≤2h1+5.

7. The end cap assembly (10) according to claim 2, characterized in that Along the axial direction of the pressing member (120), the height of the first horizontal portion (122) is h1, wherein 5MPa / mm≤P / h1≤5000MPa / mm, and P is the strength of the pressing member (120); and / or, 2.5 N / mm3≤HB / h1≤4000 N / mm3, HB being the hardness of the pressing member (120).

8. The end cap assembly (10) according to claim 2, characterized in that The pressing member (120) further includes an extension portion (127), which is arranged at an end of the second horizontal portion (124) away from the vertical portion (123), and the extension portion (127) extends toward a side away from the first horizontal portion (122).

9. The end cap assembly (10) according to claim 8, characterized in that Along the axial direction of the pressing member (120), the height of the first horizontal portion (122) is h1, the height between the opposite sides of the first horizontal portion (122) and the second horizontal portion (124) is H, and the height of the extending portion (127) is h2, and at least one of the following conditions is satisfied: 0.1mm≤h1≤2mm; 2h1<H≤2h1+5; 0<h2≤5mm.

10. The end cap assembly (10) according to claim 1, characterized in that It also includes an insulating seal (130) disposed between the pressing member (120) and the pole (110), wherein the insulating seal (130) is insulated and sealed connection with the pressing member (120) and the pole (110).

11. The end cap assembly (10) according to claim 10, characterized in that The pressing member (120) is provided with a plurality of through holes (126), the plurality of through holes (126) are arranged at intervals along the circumference of the pressing member (120), the through holes (126) are communicated with the first groove (121), and the insulating sealing member (130) fills the through holes (126).

12. The end cap assembly (10) according to claim 11, characterized in that The through holes (126) are arranged at equal intervals along the circumference of the pressing member (120).

13. The end cap assembly (10) according to claim 10, characterized in that The insulating seal (130) includes a first insulating portion (131), a sealing portion (132) and a second insulating portion (133). Along the axial direction of the pole (110), the sealing portion (132) is located between the first insulating portion (131) and the second insulating portion (133). The first insulating portion (131) is in contact with the side surface of the first metal layer (111), and the second insulating portion (133) is in contact with the side surface of the second metal layer (112). The sealing portion (132) is sealed and connected to the first metal layer (111) and / or the second metal layer (112). The hardness of the sealing portion (132) is less than the hardness of the first insulating portion (131) and the second insulating portion (133).

14. The end cap assembly (10) according to claim 10, characterized in that A portion of the insulating seal (130) is in close contact with a side of the pressing member (120) facing away from the pole (110).

15. The end cap assembly (10) according to claim 10, characterized in that A portion of the insulating seal (130) is in close contact with a side of the pressing member (120) close to the core package.

16. The end cap assembly (10) according to claim 10, characterized in that The insulating seal (130) is integrally formed.

17. The end cap assembly (10) according to claim 10, characterized in that The insulating seal (130) is arranged at an angle away from the end surface of the pole (110), and the end surface is configured to fit with the cover plate assembly (200).

18. The end cap assembly (10) according to claim 17, characterized in that The inclination angle of the end face is a, wherein 0°<a≤100°.

19. The end cap assembly (10) according to claim 10, characterized in that A buckling portion (135) is provided on a side of the insulating seal (130) close to the core package, and the buckling portion (135) is configured to be buckled and connected with a buckling fitting portion (136) on the cover plate assembly (200).

20. The end cap assembly (10) according to claim 10, characterized in that A plurality of recesses (140) are provided on a side of the pole (110) that is in contact with the insulating seal (130), and the insulating seal (130) fills the recesses (140); And / or, a side surface of the pressing member (120) that is in contact with the insulating seal (130) is provided with a plurality of recesses (140), and the insulating seal (130) fills the recesses (140).

21. The end cap assembly (10) according to claim 10, characterized in that The hardness of the insulating seal (130) is HS, wherein 20HA≤HS≤95HA.

22. The end cap assembly (10) according to claim 10, characterized in that The pole (110) is provided with an anti-torsion portion (116), and the insulating seal (130) is provided with an anti-torsion matching portion, and the anti-torsion portion (116) is engaged with the anti-torsion matching portion to limit the rotation of the pole (110).

23. The end cap assembly (10) according to any one of claims 1 to 22, characterized in that: The pole (110) is provided with a traceability code.

24. The end cap assembly (10) according to any one of claims 1 to 22, characterized in that: The hardness of the second metal layer (112) is greater than the hardness of the first metal layer (111).

25. The end cap assembly (10) according to any one of claims 1 to 22, characterized in that: The second metal layer (112) and the first metal layer (111) are made of different materials, and the second metal layer (112) and the first metal layer (111) are an integrated composite member; or, The second metal layer (112) and the first metal layer (111) are made of different materials, the second metal layer (112) and the first metal layer (111) are separately provided, and the second metal layer (112) and the first metal layer (111) are embedded.

26. The end cap assembly (10) according to any one of claims 1 to 22, characterized in that: A first flange portion (113) is provided on the side of the first metal layer (111), and a second flange portion (114) is provided on the side of the second metal layer (112). The first flange portion (113) is connected to the second flange portion (114). The first flange portion (113) and the second flange portion (114) are located in the first groove (121). The pressing member (120) presses the first flange portion (113) and the second flange portion (114) on two sides facing away from each other.

27. The end cap assembly (10) according to claim 26, 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 core package is t3, wherein 0.3mm≤t3≤5mm.

28. The end cap assembly (10) according to any one of claims 1 to 22, 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.

29. The end cap assembly (10) according to any one of claims 1 to 22, 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 the core package than the first horizontal segment (1151), and the curved segment (1152) being bent toward a side away from the second horizontal segment (1153).

30. The end cap assembly (10) according to claim 29, 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).

31. The end cap assembly (10) according to claim 30, characterized in that The bottom of the second groove (1111) is closer to the battery core 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°.

32. The end cap assembly (10) according to claim 30, 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).

33. The end cap assembly (10) according to claim 32, 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).

34. The end cap assembly (10) according to claim 1, characterized in that The cover plate assembly (200) is provided with a mounting hole (210), and the pole assembly (100) is fixed in the mounting hole (210).

35. The end cap assembly (10) according to claim 34, characterized in that The pressing member (120) is welded and fixed to the side wall of the mounting hole (210) on the cover plate assembly (200).

36. The end cap assembly (10) of claim 34, wherein: The cover plate assembly (200) 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 core package, and the metal part (230) is connected to the plastic part (240).

37. The end cap assembly (10) according to claim 36, characterized in that A mounting groove (231) is provided on one side of the metal part (230) facing the plastic part (240), wherein the size of the groove opening of the mounting groove (231) is smaller than the size of the groove bottom of the mounting groove (231), and a third protrusion (241) is provided on one side of the plastic part (240) facing the metal part (230), wherein the third protrusion (241) is fixed in the mounting groove (231).

38. The end cap assembly (10) according to claim 37, characterized in that A positioning protrusion (232) is provided at the bottom of the installation groove (231) on the metal part (230), and a positioning groove cooperating with the positioning protrusion (232) is provided on a side surface of the third protrusion (241) that is in contact with the groove bottom.

39. The end cap assembly (10) according to claim 38, characterized in that The positioning protrusion (232) and the installation groove (231) are coaxially arranged.

40. The end cap assembly (10) according to claim 37, characterized in that Along the thickness direction of the metal part (230), the cross-sectional shape of the mounting groove (231) is an inverted trapezoid; Alternatively, the side wall of the mounting groove (231) includes a first vertical section (2311), a connecting section (2312), and a second vertical section (2313) connected in sequence, wherein the first vertical section (2311) is closer to the bottom of the mounting groove (231) than the second vertical section (2313), and the second vertical section (2313) is closer to the axis of the mounting groove (231) than the first vertical section (2311).

41. The end cap assembly (10) according to claim 37, characterized in that A fourth groove (243) is provided on a side of the metal part (230) facing the plastic part (240), and the fourth groove (243) is arranged along the circumference of the mounting groove (231).

42. The end cap assembly (10) of claim 37, wherein: A boss (244) is provided on a side of the metal part (230) facing away from the plastic part (240), and along the thickness direction of the metal part (230), the projection of the mounting groove (231) is located within the projection of the boss (244).

43. The end cap assembly (10) according to claim 42, characterized in that The distance between the surface of the boss (244) facing away from the metal part (230) and the surface of the metal part (230) facing away from the plastic part (240) is L2, 0<L2≤0.5mm.

44. The end cap assembly (10) of claim 37, wherein: A sink (245) is provided on a side of the metal part (230) facing away from the plastic part (240), and along the thickness direction of the metal part (230), the projection of the mounting groove (231) is located within the projection of the sink (245).

45. A battery, characterized in that Comprising an end cap assembly (10) according to any one of claims 1 to 44.

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