Pole assembly, cover plate assembly and battery

Abstract

The utility model discloses a pole assembly, a cover plate assembly and a battery, the pole assembly comprises a pole, a sealing ring and an insulation sealing piece, and the side surface of the pole is provided with a first convex part; the pole comprises a first metal layer and a second metal layer which are arranged in a stacked mode, a groove is formed in the side, facing the pole, of the sealing ring, the pole is sleeved with the sealing ring, and the first protruding part extends into the groove; and the insulating sealing element is filled between the pole and the sealing ring. According to the invention, the problems of more parts, complex assembly and poor sealing effect of the existing pole assembly are solved, and the pole assembly has the advantages of simple structure, simple installation and operation and good sealing effect.

Description

Technical Field

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

[0002] The battery cover assembly includes a cover, a connecting piece, and a terminal assembly. The terminal assembly includes a seal, an insulator, a structural component, and a terminal. The structural component is assembled with the cover to secure the seal and insulator to the terminal, achieving insulation and sealing of the terminal. The terminal assembly has many parts and a complex assembly relationship. Furthermore, as the terminal moves under force, the compressive force on the seal decreases, and the sealing effect deteriorates. This poses the risk of battery leakage leading to insulation failure and short circuit fire. Utility Model Content

[0003] The embodiments of the present application provide a pole assembly, a cover plate assembly, and a battery to solve the problems of existing pole assemblies, such as a large number of parts, complex assembly, and poor sealing effect.

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

[0005] A pole, wherein a side surface of the pole has a first protrusion, and the pole comprises a first metal layer and a second metal layer stacked together;

[0006] A sealing ring, wherein a groove is formed on a side of the sealing ring facing the pole, the sealing ring is sleeved on the pole, and the first protrusion extends into the groove;

[0007] An insulating seal is filled between the pole and the sealing ring.

[0008] 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;

[0009] And / or, a side of the sealing ring in contact with the insulating seal is provided with a plurality of pits, and the insulating seal fills the pits.

[0010] Optionally, the sealing ring 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.

[0011] Optionally, the first horizontal portion, the vertical portion and the second horizontal portion are integrally formed.

[0012] Optionally, a second protrusion is provided on a side of the vertical portion facing away from the pole, and a welding area is provided on the second protrusion.

[0013] Optionally, the second protrusion is provided at one end of the vertical portion close to the first horizontal portion;

[0014] Alternatively, the second protrusion is provided at one end of the vertical portion close to the second horizontal portion;

[0015] Alternatively, the second protrusion is arranged in a region close to the middle of the vertical portion.

[0016] Optionally, a plurality of through holes are provided on the sealing ring, and the plurality of through holes are spaced apart along the circumference of the sealing ring. The through holes are communicated with the groove, and the insulating sealing member fills the through holes.

[0017] Optionally, the through holes are arranged at equal intervals along the circumference of the sealing ring.

[0018] Optionally, the vertical portion is provided with the through hole, and the through hole extends in the radial direction of the sealing ring;

[0019] Alternatively, the through hole is provided on the first horizontal portion, and the through hole extends along the axial direction of the sealing ring.

[0020] Optionally, along the axial direction of the sealing ring, the thickness 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:

[0021] 0.1mm≤h1≤2mm;

[0022] 2h1<H≤2h1+5.

[0023] Optionally, along the axial direction of the sealing ring, the thickness of the first horizontal portion is h1, wherein 5 MPa / mm≤P / h1≤5000 MPa / mm, and P is the strength of the sealing ring;

[0024] and / or 2.5N / mm 3 ≤HB / h1≤4000N / mm 3 , HB is the hardness of the sealing ring.

[0025] Optionally, the sealing ring further includes an extension 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.

[0026] Optionally, along the axial direction of the sealing ring, the thickness 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 extension portion is h2, and at least one of the following conditions is met:

[0027] 0.1mm≤h1≤2mm;

[0028] 2h1<H≤2h1+5;

[0029] 0<h2≤5mm.

[0030] Optionally, the insulating seal includes a first insulating portion and a sealing portion connected in sequence, the sealing portion is located between the sealing ring and the pole, and the first insulating portion extends from one end of the sealing portion through the end of the sealing ring to a side surface of the sealing ring facing away from the pole.

[0031] Optionally, the insulating seal further includes a second insulating portion, which is located on a side of the sealing portion away from the first insulating portion, is connected to the sealing portion, and extends toward a side away from the pole.

[0032] Optionally, the second insulating portion is arranged to be inclined away from the end surface of the pole, and the end surface is configured to fit with the cover body.

[0033] Optionally, an angle between the end face and a plane on which a side surface of the second insulating portion facing away from the first insulating portion is located is a, where 0°<a≤100°.

[0034] Optionally, a buckling portion is provided on a side of the second insulating portion facing away from the sealing ring, and the buckling portion is configured to be buckled and connected with a buckling fitting portion on the cover body.

[0035] Optionally, the sealing portion includes a first sealing segment, a second sealing segment, a third sealing segment, a fourth sealing segment and a fifth sealing segment connected in sequence, the first sealing segment, the third sealing segment and the fifth sealing segment extend along the axial direction of the sealing ring, and the first sealing segment is closer to the axis of the sealing ring than the third sealing segment, the fifth sealing segment is closer to the axis of the sealing ring than the first sealing segment, and the second sealing segment and the fourth sealing segment extend in a direction perpendicular to the axis of the sealing ring.

[0036] Optionally, the sealing portion includes a first sealing segment, a second sealing segment, a third sealing segment, a fourth sealing segment, a fifth sealing segment and a sixth sealing segment connected in sequence, the first sealing segment, the third sealing segment and the fifth sealing segment extend along the axial direction of the sealing ring, and the first sealing segment is closer to the axis of the sealing ring than the third sealing segment, the fifth sealing segment is closer to the axis of the sealing ring than the first sealing segment, the second sealing segment, the fourth sealing segment and the sixth sealing segment extend in a direction perpendicular to the axis of the sealing ring, and the sixth sealing segment is closer to the axis of the sealing ring than the fourth sealing segment.

[0037] Optionally, the insulating seal is formed by an injection molding process.

[0038] Optionally, the insulating seal includes one of a PPS insulating seal, a PP insulating seal, a PBT insulating seal or a PFA insulating seal.

[0039] Optionally, the hardness of the insulating seal is HS, wherein 20HA≤HS≤95HA.

[0040] Optionally, an anti-torsion portion is provided on the pole, and the anti-torsion matching portion is provided on the insulating seal, and the anti-torsion portion is engaged with the anti-torsion matching portion.

[0041] Optionally, a traceability code is provided on an end surface of the pole close to the battery cell.

[0042] In a second aspect, an embodiment of the present application further provides a cover plate assembly, comprising: a pole assembly as described in any one of the above;

[0043] The cover plate body is provided with a mounting hole, and the pole assembly is fixed in the mounting hole.

[0044] Optionally, the sealing ring is fixed to the side wall of the mounting hole on the cover plate body by welding.

[0045] Optionally, a third protrusion is provided on the side of the cover body facing away from the battery cell, and the third protrusion is located around the mounting hole. Along the axial direction of the pole, the surface of the third protrusion is higher than the side of the first protrusion close to the battery cell, and one end of the insulating seal extends between the third protrusion and the sealing ring.

[0046] In a third aspect, an embodiment of the present application further provides a battery comprising the cover plate assembly described above.

[0047] The embodiments of the present application provide a pole assembly, a cover plate assembly and a battery, wherein the pole assembly includes a pole, a sealing ring and an insulating seal. The pole assembly has fewer components and is easy to assemble. The side of the pole has a first protrusion, the sealing ring has a groove for accommodating the first protrusion, the insulating seal is filled between the sealing ring and the pole, the upper side wall of the groove on the sealing ring limits the pole from moving upward, and the upper side wall of the groove on the sealing ring presses the insulating seal against the pole, the lower side wall of the groove on the sealing ring limits the pole from moving downward, and the lower side wall of the groove on the sealing ring presses the insulating seal against the pole, the pole is subjected to force both above and below, thereby improving the mechanical properties and sealing of the pole, overcoming the problems of the existing pole assembly with many components, complex assembly and poor sealing effect, and achieving the advantages of simple structure, simple installation and operation and good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] 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.

[0049] 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.

[0050] Figure 1 A schematic diagram of a cover assembly provided in an embodiment of the present application.

[0051] Figure 2 A cross-sectional view of a cover assembly provided in an embodiment of the present application.

[0052] Figure 3 This is an exploded view of the cover assembly provided in an embodiment of the present application.

[0053] Figure 4 for Figure 2 A partial enlarged view of the first form at A in the middle.

[0054] Figure 5 for Figure 2 A partial enlarged view of the second form at A in the middle.

[0055] Figure 6 for Figure 2 A partial enlarged view of the third form at A in the middle.

[0056] Figure 7 for Figure 2 A partial enlarged view of the fourth form at A in the middle.

[0057] Figure 8 for Figure 2 A partial enlarged view of the fifth form at A in the middle.

[0058] Figure 9 for Figure 2 A partial enlarged view of the sixth form at A in the middle.

[0059] Figure 10 for Figure 2 A partial enlarged view of the seventh form at A in the middle.

[0060] Figure 11 This is a partial schematic diagram of the connection between the insulating seal, the sealing ring and the pole in an embodiment of the present application.

[0061] Figure 12 This is a three-dimensional diagram of the first form of providing a through hole in the sealing ring in an embodiment of the present application.

[0062] Figure 13 This is a stereoscopic diagram of a second form of a through hole provided in a sealing ring in an embodiment of the present application.

[0063] Figure 14 This is a three-dimensional diagram of the third form of providing a through hole in the sealing ring in the embodiment of the present application.

[0064] Figure 15 This is a marked diagram of the sealing ring in the embodiment of the present application.

[0065] Figure 16 This is a diagram illustrating the configuration of an extension sealing ring in an embodiment of the present application.

[0066] Figure 17 A three-dimensional schematic diagram of a pole provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] 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.

[0068] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 An embodiment of the present application provides a pole assembly 100 , including a pole 110 , a sealing ring 120 and an insulating seal 130 .

[0069] In this embodiment, the pole 110 is a cylindrical structure, and the side surface of the pole 110 has a first protrusion 111 that protrudes away from the axis of the pole 110. The diameter of the first protrusion 111 is larger than the diameter of other positions on the pole 110. Along the axis of the pole 110, the first protrusion 111 is located in the middle area of the pole 110. For example, there is a certain distance between the upper surface of the first protrusion 111 and the upper surface of the pole 110, and there is a certain distance between the lower surface of the first protrusion 111 and the lower surface of the pole 110. The pole 110 includes a first metal layer and a second metal layer that are stacked, and the materials of the first metal layer and the second metal layer are different. The first metal layer is closer to the battery cell than the second metal layer. The hardness of the first metal layer is greater than the hardness of the second metal layer.

[0070] In this embodiment, a groove 121 is formed on the side of the sealing ring 120 facing the pole 110. The groove 121 is adapted to the first protrusion 111. The sealing ring 120 is sleeved on the pole 110, and the first protrusion 111 at least partially extends into the groove 121. The upper side wall of the groove 121 on the sealing ring 120 is located above the upper surface of the first protrusion 111. The lower side wall of the groove 121 on the sealing ring 120 is located below the lower surface of the first protrusion 111. The side of the sealing ring 120 facing the pole 110 is spaced a certain distance from the side surface of the pole 110. The sealing ring 120 is made of metal material and has high structural strength. The metal material can be aluminum material, stainless steel material, or a composite material of aluminum material and stainless steel material.

[0071] In this embodiment, an insulating seal 130 is inserted between the terminal 110 and the sealing ring 120. One side of the insulating seal 130 is in contact with the terminal 110, and the other side is in contact with the sealing ring 120. The sidewalls of the groove 121 on the sealing ring 120 and the surface of the first protrusion 111 are filled with the insulating seal 130. The insulating seal 130 performs both insulating and sealing functions. After the sealing ring 120 and the terminal 110 are assembled, the insulating seal 130 is formed through an injection molding process.

[0072] In the embodiment of the present application, sealing surfaces are formed on the upper, lower, and side surfaces of the first protrusion 111 of the pole 110 by means of a sealing ring 120 and an insulating seal 130. The sealing ring 120 restricts upward or downward movement of the pole 110, thereby improving the mechanical properties of the pole 110. Even if the pole 110 moves, the sealing ring 120 always compresses the insulating seal 130, ensuring the sealing effect of the pole 110. The pole assembly 100 has a relatively small number of components, a simple structure, and excellent sealing and insulation effects.

[0073] 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 sealing ring 120 and the insulating seal 130, and protrusions are formed on the surface of the insulating seal 130 to mate with the recesses 140.

[0074] 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.

[0075] In some embodiments, see Figure 11 The side of the sealing ring 120 that contacts the insulating seal 130 is provided with a plurality of recesses 140. Recesses 140 can be formed on the surface of the sealing ring 120 by electrochemical etching. The bottom of recesses 140 is larger than the opening of the notch. The insulating seal 130 fills recesses 140. For example, insulating sealing material is injected into the space between the sealing ring 120 and the insulating seal 130, and protrusions are formed on the surface of the insulating seal 130 to mate with recesses 140.

[0076] In the embodiment of the present application, the sealing ring 120 cooperates with the insulating seal 130 to form an inlaid undercut structure, thereby improving the sealing performance between the sealing ring 120 and the insulating seal 130 and the bonding strength between the insulating seal 130 and the sealing ring 120 .

[0077] In some embodiments, see Figure 4 The sealing ring 120 includes a first horizontal portion 122, a vertical portion 123, and a second horizontal portion 124, which are 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 dimensions. 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 the ends facing away from the pole 110. The first horizontal portion 122, the vertical portion 123, and the second horizontal portion 124 form a groove 121.

[0078] For example, see Figure 3 and Figure 4 The cover body 200 comprises a plain aluminum sheet 230 and a plastic plate 240. The plain aluminum sheet 230 and the plastic plate 240 mate with each other on the side facing away from the battery cell. A mounting hole 210 is provided on the cover body 200. Mounting hole 210 comprises a first mounting sub-hole 211 and a second mounting sub-hole 212, which extend through and are coaxially arranged. The first mounting sub-hole 211 is provided on the plain aluminum sheet 230. The sidewall of the first mounting sub-hole 211 mates with the side of the vertical portion 123 facing away from the electrode 110. The plastic plate 240 supports the bottom of the sealing ring 120.

[0079] In the embodiment of the present application, the sealing ring 120 is composed of a first horizontal portion 122, a vertical portion 123, and a second horizontal portion 124. The first horizontal portion 122 and the second horizontal portion 124 are respectively located on either side of the first raised portion 111, forming a sealing position on both sides of the first raised portion 111. The sealing positions are symmetrical, and the force on the sealing position of the terminal is evenly distributed, thereby improving the mechanical properties and sealing performance of the terminal.

[0080] In some embodiments, the first horizontal portion 122, the vertical portion 123, and the second horizontal portion 124 are integrally formed. The sealing ring 120 can be integrally formed by stamping, bending, etc. The integral molding of the sealing ring 120 simplifies the processing and improves the structural strength.

[0081] In some embodiments, see Figure 5 、 Figure 6 、 Figure 7 and Figure 8 A second raised portion 125 is provided on the side of the vertical portion 123 facing away from the pole 110. The second raised portions 125 are arranged along the circumference of the vertical portion 123. A welding area is provided on the second raised portion 125. The second raised portion 125 is welded to the cover plate body 200. This welding of the second raised portion 125 to the cover plate body 200 facilitates installation.

[0082] In some embodiments, the second raised portion 125 is disposed at one end of the vertical portion 123 near the first horizontal portion 122. The side of the second 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 second raised portion 125 near the second horizontal portion 124 is a welding area, and the second raised portion 125 is welded to the cover plate body 200.

[0083] Exemplarily, a side of the second protrusion 125 close to the second horizontal portion 124 is located above the smooth aluminum sheet 230 , and a lower side surface of the second protrusion 125 is in contact with an upper surface of the smooth aluminum sheet 230 around the first mounting sub-hole 211 .

[0084] In some embodiments, see Figure 5 and Figure 6 The second raised portion 125 is provided at one end of the vertical portion 123 near the second horizontal portion 124. The side surface of the second 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 second raised portion 125 is a welding area, and the second raised portion 125 is welded to the cover plate body 200.

[0085] For example, see Figure 5 and Figure 6 The walls of the first mounting sub-hole 211 are stepped, with the diameter of the first mounting sub-hole 211 at one end closer to the top surface of the aluminum sheet 230 being smaller than the diameter of the other end. The second raised portion 125 is located within the first mounting sub-hole 211, with the walls of the first mounting sub-hole 211 in contact with the second raised portion 125. The sidewalls of the first mounting sub-hole 211 in the aluminum sheet 230 press against the second raised portion 125, limiting the movement of the sealing ring 120 and improving its mechanical properties.

[0086] In some embodiments, see Figure 7 and Figure 8The second raised portion 125 is located near the middle of the vertical portion 123. The upper surface of the second raised portion 125 is spaced a certain distance from the upper surface of the first horizontal portion 122, and the lower surface of the second 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 second raised portion 125 and the upper surface of the first horizontal portion 122 is greater than the distance between the lower surface of the second raised portion 125 and the lower surface of the second horizontal portion 124. The side surface of the second raised portion 125 serves as a welding area.

[0087] For example, see Figure 7 and Figure 8 The wall of the first mounting sub-hole 211 is stepped, with the second raised portion 125 and the side surface of the sealing ring 120 below the second raised portion 125 abutting against the wall of the first mounting sub-hole 211. The side of the second raised portion 125 near the first horizontal portion 122 is flush with the upper surface of the plain aluminum sheet 230. The sidewall of the mounting hole 210 on the cover body 200, through which the pole assembly 100 is mounted, has a step corresponding to the sidewall of the second raised portion 125 and the vertical portion 123 below the second raised portion 125, facilitating installation of the sealing ring 120 and limiting its movement.

[0088] In some embodiments, see Figure 12 、 Figure 13 and Figure 14 The sealing ring 120 is provided with a plurality of through holes 126 , which are spaced apart along the circumference of the sealing ring 120 . The through holes 126 are communicated with the groove 121 , and the insulating sealing member 130 fills the through holes 126 .

[0089] In the embodiment of the present application, a through hole 126 is provided in the sealing ring 120, which extends through the inside and outside of the sealing ring 120. Accordingly, the portion of the insulating seal 130 located within the through hole 126 connects the insulating seal 130 on the inside and outside of the sealing ring 120. This improves the stability of the connection between the insulating seal 130 and the sealing ring 120. It also reduces twisting, pushing, and pulling between the insulating seal 130 and the sealing ring 120. This reduces the likelihood of the sealing ring 120 becoming uneven due to material deformation.

[0090] In some embodiments, the through holes 126 are arranged at equal intervals along the circumference of the sealing ring 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 sealing ring 120 is located.

[0091] In the embodiment of the present application, the through holes 126 are arranged at equal intervals along the circumference of the sealing ring 120, and the sealing ring 120 is evenly subjected to the force of the insulating seal 130 in the circumferential direction. The insulating seal 130 and the sealing ring 120 have strong anti-twisting ability.

[0092] In some embodiments, see Figure 13A through hole 126 is defined on the vertical portion 123 , and the through hole 126 extends in the radial direction of the sealing ring 120 .

[0093] In the embodiment of the present application, the through hole 126 extends in the radial direction of the sealing ring 120 , thereby improving the anti-torsion capability of the sealing ring 120 and limiting the axial movement of the sealing ring 120 .

[0094] In some embodiments, see Figure 12 and Figure 14 A through hole 126 is defined in the first horizontal portion 122, extending axially along the sealing ring 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 sealing ring 120.

[0095] In some embodiments, see Figure 15 Along the axial direction of the sealing ring 120 , the thickness 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.

[0096] In the embodiment of the present application, the first horizontal portion 122 of the sealing ring 120 is associated with the overall size of the sealing ring 120 and is reasonably designed to avoid the sealing ring 120 being too large, resulting in a situation where the battery has a low volume utilization rate.

[0097] In some embodiments, the thickness of the first horizontal portion 122 along the axial direction of the sealing ring 120 is h1, where 5 MPa / mm≤P / h1≤5000 MPa / mm, and P is the strength of the sealing ring 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.

[0098] In the embodiment of the present application, the strength of the sealing ring 120 is correlated with the thickness of the first horizontal portion 122. The material of the sealing ring 120 can be selected based on the thickness of the first horizontal portion 122, or the thickness of the first horizontal portion 122 can be designed based on the material of the sealing ring 120. This ensures that the size and strength of the sealing ring 120 meet the design requirements.

[0099] In some embodiments, 2.5 N / mm 3 ≤HB / h1≤4000N / mm 3 HB is the hardness of the sealing ring 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.

[0100] In the embodiment of the present application, the hardness of the sealing ring 120 is correlated with the thickness of the first horizontal portion 122. The material of the sealing ring 120 can be selected based on the thickness of the first horizontal portion 122, and the thickness of the first horizontal portion 122 can also be designed based on the material of the sealing ring 120. This ensures that the size and hardness of the sealing ring 120 meet the design requirements.

[0101] In some embodiments, see Figure 9 and Figure 16 The sealing ring 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 .

[0102] For example, see Figure 9The cover body 200 includes a plain aluminum sheet 230 and a plastic plate 240, and the plain aluminum sheet 230 is bonded to the side of the plastic plate 240 facing away from the battery cell. A mounting hole 210 is provided on the cover body 200, 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 plain aluminum sheet 230, and the side wall of the first mounting sub-hole 211 has a step structure that is adapted to the vertical portion 123, the second horizontal portion 124 and the extension portion 127 of the sealing ring 120. The vertical portion 123 is bonded to the upper half of the hole wall of the first mounting sub-hole 211, and the extension portion 127 is bonded to the lower half of the hole wall of the first mounting sub-hole 211. The second sub-mounting hole 212 is provided in the plastic plate 240. The diameter of the first sub-mounting hole 211 is larger than that of the second sub-mounting hole 212. The sidewall of the second sub-mounting hole 212 aligns with the sidewall of the pole 110. The end of the extension 127 facing away from the first horizontal portion 122 abuts against the side surface of the plastic plate 240 near the aluminum sheet 230.

[0103] In this embodiment of the present application, the sealing ring 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 bare aluminum sheet 230 and is welded to the bare aluminum sheet 230. This facilitates the assembly of the sealing ring 120 and the cover plate body 200 and improves the laser welding yield.

[0104] In some embodiments, see Figure 16 Along the axial direction of the sealing ring 120, the thickness 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. The value of h1 can be 0.1mm, 0.5mm, 0.8mm, 1.3mm, 1.6mm, 2mm, or other unspecified values. The value of H2 can be 0.1mm, 0.9mm, 1.2mm, 1.8mm, 2.1mm, 3.5mm, 4.1mm, 4.8mm, 5mm, or other unspecified values.

[0105] In some embodiments, see Figure 4 、 Figure 9The 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 sealing ring 120 and the pole 110. The contour of the side of the sealing portion 132 close to the sealing ring 120 is adapted to the inner wall of the sealing ring 120, and the contour of the side of the sealing portion 132 close to the pole 110 is adapted to 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 sealing ring 120 to the side of the sealing ring 120 facing away from the pole 110. Exemplarily, a portion of the first insulating portion 131 is located at the end of the sealing ring 120 facing away from the battery cell, the first insulating portion 131 extends along the surface of the sealing ring 120, and the other portion of the first insulating portion 131 is located on the side of the sealing ring 120, and the first insulating portion 131 is bent. The shape of the first insulating portion 131 is adapted to the outer surface of the sealing ring 120. An end portion of the first insulating portion 131 extends to a side surface of the cover body 200 facing away from the battery cell, or extends into the mounting hole 210 .

[0106] In the embodiment of the present application, 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 sealing ring 120 and the terminal 110 to achieve an insulating seal between the sealing ring 120 and the terminal 110. The first insulating portion 131 extends from one end of the sealing portion 132 to the side of the sealing ring 120, thereby extending the creepage distance and improving the insulation performance.

[0107] In some embodiments, see Figure 4 and Figure 5 The 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 .

[0108] 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 first protrusion 111, the second cylindrical structure is located below the first protrusion 111, and the third cylindrical structure is located on the side of the second cylindrical structure away from the first protrusion 111. 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 part 131, a sealing part 132 and a second insulating part 133. The upper surface of the first insulating part 131 is flush with the upper surface of the pole 110, and the lower surface of the second insulating part 133 is flush with the lower end of the second cylindrical structure.

[0109] Correspondingly, the cover body 200 includes a plain aluminum sheet 230 and a plastic plate 240. The plain aluminum sheet 230 is located on the side of the plastic plate 240 away from the battery cell, and the plain aluminum sheet 230 is fixedly connected to the plastic plate 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 plain aluminum sheet 230. The aperture of the first mounting sub-hole 211 is adapted to the outer diameter of the sealing ring 120. The end of the first insulating portion 131 is located between the sealing ring 120 and the hole wall of the first mounting sub-hole 211. The second mounting sub-hole 212 is arranged on the plastic plate 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.

[0110] 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 diameter of the bare aluminum sheet 230 and improve the insulation performance.

[0111] In some embodiments, see Figure 5 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 fit the cover body 200. Correspondingly, the second mounting sub-hole 212 is tilted near a side wall of the first mounting sub-hole 211.

[0112] In the embodiment of the present application, the contact area between the second insulating portion 133 and the plastic plate 240 is large, and the second insulating portion 133 and the plastic plate 240 are closely attached to each other, thereby improving the high-voltage insulation performance.

[0113] In some embodiments, see Figure 5 The angle a between the end face 134 and the plane of the side surface of the second insulating portion 133 facing away from the first insulating portion 131 is defined as 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 the end face 134 is designed to be reasonable, facilitates processing, and ensures wedge-shaped contact between the second insulating portion 133 and the plastic plate 240.

[0114] In some embodiments, see Figure 10A snap-fitting portion 135 is provided on the side of the second insulating portion 133 facing away from the sealing ring 120. This snap-fitting portion 135 is configured to snap-fit with a snap-fitting portion 136 on the cover body 200. The snap-fitting portion 135 is a groove and / or protrusion provided on the sealing ring 120, while the snap-fitting portion 133 is a protrusion and / or groove provided on the plastic plate 240. The second insulating portion 133 and the plastic plate 240 form a mutually interlocking structure, improving high-voltage insulation performance.

[0115] In some embodiments, see Figure 4 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. First sealing segment 1321, third sealing segment 1323, and fifth sealing segment 1325 extend axially along sealing ring 120. First sealing segment 1321 is closer to the axis of sealing ring 120 than third sealing segment 1323, and fifth sealing segment 1325 is closer to the axis of sealing ring 120 than first sealing segment 1321. Second sealing segment 1322 and fourth sealing segment 1324 extend in a direction perpendicular to the axis of sealing ring 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 of the first raised portion 111 of the pole 110 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.

[0116] 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.

[0117] In some embodiments, see Figure 9Sealing 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. First sealing segment 1321, third sealing segment 1323, and fifth sealing segment 1325 extend axially along sealing ring 120. First sealing segment 1321 is closer to the axis of sealing ring 120 than third sealing segment 1323, and fifth sealing segment 1325 is closer to the axis of sealing ring 120 than first sealing segment 1321. Second sealing segment 1322, fourth sealing segment 1324, and sixth sealing segment 1326 extend perpendicular to the axis of sealing ring 120, with sixth sealing segment 1326 being closer to the axis of sealing ring 120 than fourth sealing segment 1324.

[0118] 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.

[0119] In some embodiments, the insulating seal 130 is formed by an injection molding process. During the manufacturing process, after the sealing ring 120 is welded to the cover body 200 , the sealing ring 120 is sleeved on the pole 110 , and then the insulating seal 130 is formed by an injection molding process.

[0120] 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 sealing ring 120, has a good insulating and sealing effect, and is simple to process.

[0121] 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.

[0122] 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, 96HA, or other unspecified values.

[0123] 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.

[0124] In some embodiments, see Figure 17 , an anti-torsion portion 112 is provided on the pole 110, and an anti-torsion matching portion is provided on the insulating seal 130, and the anti-torsion portion 112 is engaged with the anti-torsion matching portion. The anti-torsion portion 112 is a raised structure provided on the surface of the pole 110, such as a plurality of raised structures, and the plurality of raised structures are arranged at intervals along the circumference of the pole 110. Correspondingly, the anti-torsion matching portion is a groove structure provided on the insulating seal 130, and the plurality of groove structures are engaged with the raised structure. As a variation, the anti-torsion portion 112 is a groove structure, and the anti-torsion matching portion is a raised structure. Alternatively, the anti-torsion portion 112 includes a groove structure and a raised structure, and the anti-torsion matching portion includes a raised structure and a groove structure.

[0125] The anti-torsion portion 112 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.

[0126] In some embodiments, a traceability code is provided on the end surface of the electrode 110 near the battery cell. This code can be a QR code or a barcode. Scanning the code with a barcode scanner provides basic information about the electrode. This information includes information about the connection between the electrode 110 and the cover body 200, manufacturer information, and production batch information. This facilitates traceability of information about the electrode 110.

[0127] See also Figure 1 、 Figure 2 and Figure 3 The present application also provides a cover plate assembly 10, comprising any of the above-described pole assembly 100 and a cover plate body 200. The cover plate body 200 is provided with a mounting hole 210, and the pole assembly 100 is fixed in the mounting hole 210. The cover plate assembly 10 in the present application has the same technical effects as the pole assembly 100 in the above-described embodiment, and will not be described in detail in the present application.

[0128] In some embodiments, see Figure 2 and Figure 3 The sealing ring 120 is welded and fixed to the side wall of the mounting hole 210 on the cover body 200.

[0129] In the embodiment of the present application, the sealing ring 120 is welded to the cover body 200. The assembled sealing ring 120 and the cover body 200 provide excellent stability and structural strength. The sealing ring 120 limits the upper and lower surfaces of the first raised portion 111 of the terminal 110, reducing the sealing compression force and improving the mechanical properties of the assembled terminal assembly 100 and the cover body 200.

[0130] In some embodiments, see Figure 8A third protrusion 220 is provided on the side of the cover body 200 facing away from the battery cell. The third protrusion 220 is located around the mounting hole 210. Along the axial direction of the electrode 110, the surface of the third protrusion 220 is higher than the side of the first protrusion 111 close to the battery cell. One end of the insulating seal 130 extends between the third protrusion 220 and the sealing ring 120. For example, the first insulating portion 131 extends between the third protrusion 220 and the sealing ring 120, and the first insulating portion 131 is in contact with the wall of the mounting hole 210 and the side wall of the sealing ring 120.

[0131] In the embodiment of the present application, by providing the third protrusion 220, the depth of the mounting hole 210 is increased, thereby increasing the depth of the sealing ring 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.

[0132] An embodiment of the present application further provides a battery, comprising the cover plate assembly 10 of the above embodiment.

[0133] 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.

[0134] 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.

[0135] The above is a detailed introduction to the pole assembly, cover assembly and battery provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pole assembly (100), characterized in that: include: A pole (110), wherein a side surface of the pole (110) has a first protrusion (111), and the pole (110) comprises a first metal layer and a second metal layer stacked together; A sealing ring (120), wherein a groove (121) is formed on a side of the sealing ring (120) facing the pole (110), the sealing ring (120) is sleeved on the pole (110), and the first protrusion (111) extends into the groove (121); An insulating seal (130) is filled between the pole (110) and the sealing ring (120).

2. The pole assembly (100) according to claim 1, 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 sealing ring (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).

3. The pole assembly (100) according to claim 1, characterized in that The sealing ring (120) comprises 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).

4. The pole assembly (100) according to claim 3, characterized in that The first horizontal portion (122), the vertical portion (123) and the second horizontal portion (124) are integrally formed.

5. The pole assembly (100) according to claim 3, characterized in that A second 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 second protruding portion (125).

6. The pole assembly (100) according to claim 5, characterized in that The second protruding portion (125) is provided at one end of the vertical portion (123) close to the first horizontal portion (122); Alternatively, the second protruding portion (125) is provided at one end of the vertical portion (123) close to the second horizontal portion (124); Alternatively, the second raised portion (125) is arranged in an area close to the middle of the vertical portion (123).

7. The pole assembly (100) according to claim 3, characterized in that The sealing ring (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 sealing ring (120), the through holes (126) are communicated with the groove (121), and the insulating sealing member (130) fills the through holes (126).

8. The pole assembly (100) according to claim 7, characterized in that The through holes (126) are arranged at equal intervals along the circumference of the sealing ring (120).

9. The pole assembly (100) according to claim 7, characterized in that The through hole (126) is formed on the vertical portion (123), and the through hole (126) extends in the radial direction of the sealing ring (120); Alternatively, the through hole (126) is provided on the first horizontal portion (122), and the through hole (126) extends along the axial direction of the sealing ring (120).

10. The pole assembly (100) according to claim 3, characterized in that Along the axial direction of the sealing ring (120), the thickness 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.

11. The pole assembly (100) according to claim 3, characterized in that Along the axial direction of the sealing ring (120), the thickness of the first horizontal portion (122) is h1, wherein 5MPa / mm≤P / h1≤5000MPa / mm, and P is the strength of the sealing ring (120); and / or 2.5N / mm 3 ≤HB / h1≤4000N / mm 3 , HB is the hardness of the sealing ring (120).

12. The pole assembly (100) according to claim 3, characterized in that The sealing ring (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).

13. The pole assembly (100) according to claim 12, characterized in that Along the axial direction of the sealing ring (120), the thickness 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.

14. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: The insulating seal (130) comprises a first insulating portion (131) and a sealing portion (132) connected in sequence, wherein the sealing portion (132) is located between the sealing ring (120) and the pole (110), and the first insulating portion (131) extends from one end of the sealing portion (132) through the end of the sealing ring (120) to a side surface of the sealing ring (120) facing away from the pole (110).

15. The pole assembly (100) according to claim 14, characterized in that The insulating seal (130) further includes a second insulating portion (133), the second insulating portion (133) being located on a side of the sealing portion (132) away from the first insulating portion (131), the second insulating portion (133) being connected to the sealing portion (132), and the second insulating portion (133) extending toward a side away from the pole (110).

16. The pole assembly (100) according to claim 15, characterized in that The second insulating portion (133) is arranged to be inclined away from the end surface (134) of the pole (110), and the end surface (134) is configured to fit with the cover body (200).

17. The pole assembly (100) according to claim 16, characterized in that The angle between the end face (134) and the plane where the side surface of the second insulating portion (133) facing away from the first insulating portion (131) is located is a, wherein 0°<a≤100°.

18. The pole assembly (100) according to claim 15, characterized in that A buckling portion (135) is provided on a side of the second insulating portion (133) facing away from the sealing ring (120), and the buckling portion (135) is configured to be buckled and connected with a buckling fitting portion (136) on the cover plate body (200).

19. The pole assembly (100) according to claim 15, characterized in that 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) connected in sequence, wherein the first sealing segment (1321), the third sealing segment (1323) and the fifth sealing segment (1325) extend along the axial direction of the sealing ring (120), and the first sealing segment (1321) is closer to the axis of the sealing ring (120) than the third sealing segment (1323), and the fifth sealing segment (1325) is closer to the axis of the sealing ring (120) than the first sealing segment (1321), and the second sealing segment (1322) and the fourth sealing segment (1324) extend in a direction perpendicular to the axis of the sealing ring (120).

20. The pole assembly (100) according to claim 14, characterized in that 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) connected in sequence, wherein the first sealing segment (1321), the third sealing segment (1323) and the fifth sealing segment (1325) extend along the axial direction of the sealing ring (120), and the first sealing segment (1321) is larger than the third sealing segment ( 1323) is close to the axis of the sealing ring (120), the fifth sealing segment (1325) is closer to the axis of the sealing ring (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 sealing ring (120), and the sixth sealing segment (1326) is closer to the axis of the sealing ring (120) than the fourth sealing segment (1324).

21. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: The insulating seal (130) is formed by an injection molding process.

22. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: The insulating seal (130) comprises one of a PPS insulating seal, a PP insulating seal, a PBT insulating seal or a PFA insulating seal.

23. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: The hardness of the insulating seal (130) is HS, wherein 20HA≤HS≤95HA.

24. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: The pole (110) is provided with an anti-torsion portion (112), the insulating seal (130) is provided with an anti-torsion matching portion, and the anti-torsion portion (112) is engaged with the anti-torsion matching portion.

25. The pole assembly (100) according to any one of claims 1 to 13, characterized in that: A traceability code is provided on one end surface of the pole (110) close to the battery cell.

26. A cover plate assembly (10), characterized in that: include: The pole assembly (100) according to any one of claims 1 to 25; A cover plate body (200) is provided with a mounting hole (210), and the pole assembly (100) is fixed in the mounting hole (210).

27. The cover plate assembly (10) according to claim 26, characterized in that The sealing ring (120) is welded and fixed to the side wall of the mounting hole (210) on the cover plate body (200).

28. The cover plate assembly (10) according to claim 26, characterized in that A third protrusion (220) is provided on a side of the cover plate body (200) facing away from the battery cell. The third protrusion (220) is located around the mounting hole (210). Along the axial direction of the pole (110), the surface of the third protrusion (220) is higher than a side of the first protrusion (111) close to the battery cell. One end of the insulating seal (130) extends between the third protrusion (220) and the sealing ring (120).

29. A battery, characterized in that: Comprising the cover plate assembly (10) as claimed in claim 26.

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