Terminal components and batteries

Abstract

This invention relates to the field of battery technology, and in particular to a terminal assembly and a battery. The terminal assembly includes: a circumferential sidewall of the terminal body forming an annular platform portion protruding radially outward along the battery, the annular platform portion having a first anti-rotation groove; an insulating member surrounding the terminal body, the inner annular wall of the insulating member forming a first protruding portion capable of extending into the first anti-rotation groove, the outer annular wall of the insulating member having an assembly annular groove, the groove wall of the assembly annular groove having a second protruding portion; a press-fitting member having a first connecting portion and a second connecting portion extending radially along the battery at both ends in the axial direction of the battery, the first connecting portion having a second anti-rotation groove, the first connecting portion extending into the assembly annular groove so that the second anti-rotation groove engages with the second protruding portion, the second connecting portion being fitted with a housing. In the terminal assembly of this invention, the terminal body, insulating member, and press-fitting member can be assembled as a whole with the battery housing, simplifying the assembly process, improving assembly efficiency, and thus improving battery production efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an electrode assembly and a battery. Background Technology

[0002] Cylindrical batteries are widely used due to their mature manufacturing process and good rate performance. A battery consists of electrode arrays, a cover plate, and a casing. The cover plate or casing houses the terminals used for power transfer. The assembly of these terminals requires consideration of the battery's sealing and insulation performance. Therefore, the battery assembly process involves assembling multiple components, such as terminals, plastic parts, and sealing rings, onto the cover plate or casing. This process is complex, inefficient, and negatively impacts battery production efficiency. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a terminal assembly and a battery to solve the problems of complex procedures and low assembly efficiency in the assembly process of existing cylindrical batteries.

[0004] A first aspect of the present invention provides a pole assembly, wherein the pole assembly comprises:

[0005] The electrode body has a circumferential sidewall with a circumferentially protruding annular platform portion that protrudes outward along the radial direction of the battery, and a first anti-rotation groove is provided on the annular platform portion.

[0006] An insulating component is formed as an annular structure surrounding the circumferential sidewall of the pole body. A first protrusion is formed on the inner annular wall of the insulating component, which can extend into the first anti-rotation groove. An assembly ring groove is provided on the outer annular wall of the insulating component, and a second protrusion is provided on the groove wall of the assembly ring groove.

[0007] A press-fit component is provided around the circumferential sidewall of the insulating component. The press-fit component has a first connecting portion and a second connecting portion extending radially along the battery at both ends in the axial direction of the battery. The first connecting portion and the second connecting portion extend in opposite directions in the radial direction of the battery.

[0008] The first connecting part is provided with a second anti-rotation groove, and the first connecting part extends into the assembly ring groove so that the second anti-rotation groove engages with the second protrusion. The second connecting part is used to assemble the battery casing.

[0009] Preferably, the total projected area of ​​the first anti-rotation groove on a cross-section perpendicular to the battery axis is S, in mm. 2 S≥3mm 2 The projected area of ​​the annular portion on a cross section perpendicular to the battery axis is S1, in mm. 2 10%≤S / S1≤90%.

[0010] Preferably, the thickness of the annular portion along the battery axis is A1, in mm; the depth of the first anti-rotation groove along the battery axis is A, in mm; 15%≤A / A1≤1.

[0011] Preferably, in the axial direction of the battery, the mounting ring groove is disposed on the side of the ring platform facing the outside of the battery;

[0012] The overlapping area of ​​the projections of the first connecting part and the ring platform part on a cross section perpendicular to the battery axis is a ring structure. The distance between the inner ring wall and the outer ring wall of the ring structure in the radial direction of the battery is L, 0.5mm≤L≤2mm.

[0013] Preferably, it further includes:

[0014] A sealing element is fitted onto the circumferential sidewall of the end of the terminal body facing the inside of the battery; in the axial direction of the battery, a portion of the sealing element is sandwiched between the battery casing and the terminal body.

[0015] The ring section includes a first ring section and a second ring section nested together in the radial direction of the battery. The first ring section is disposed on the radial inner side of the second ring section. The first anti-rotation groove is disposed on the second ring section. The seal coincides with the projection portion of the first ring section in a cross section perpendicular to the battery axis.

[0016] The outer and inner ring walls of the first ring have a radial dimension M in the battery, where 0.8mm ≤ M ≤ 2mm.

[0017] Preferably, in the axial direction of the battery, the electrode body has a first groove at the end facing the outside of the battery and a second groove at the end facing the inside of the battery, and the first groove and the second groove are arranged opposite to each other in the axial direction of the battery.

[0018] Preferably, S11≤S12, C1≤C2, T≥1.3×P×S11 / (K×C1);

[0019] S11 is the area of ​​the bottom of the first groove, in mm. 2 S12 is the area of ​​the bottom of the second groove, in mm. 2 C1 is the perimeter of the bottom of the first groove, in mm; C2 is the perimeter of the bottom of the second groove, in mm; T is the distance between the bottom of the first groove and the bottom of the second groove along the battery axis, in mm; P is the opening pressure of the battery explosion-proof valve, in MPa; K is the shear strength of the electrode body, in MPa.

[0020] Preferably, S12≤S11, C2≤C1, T≥1.3×P×S12 / (K×C2);

[0021] S11 is the area of ​​the bottom of the first groove, in mm. 2 S12 is the area of ​​the bottom of the second groove, in mm. 2 C1 is the perimeter of the bottom of the first groove, in mm; C2 is the perimeter of the bottom of the second groove, in mm; T is the distance between the bottom of the first groove and the bottom of the second groove along the battery axis, in mm; P is the opening pressure of the battery explosion-proof valve, in MPa; K is the shear strength of the electrode body, in MPa.

[0022] Preferably, the battery casing includes a cover plate and a housing;

[0023] The pole assembly is mounted on the cover plate, or the pole assembly is mounted on the housing.

[0024] A second aspect of the present invention provides a battery comprising the terminal assembly described in any of the above technical solutions.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In the electrode assembly of the present invention, the circumferential sidewall of the electrode body has an annular truncated portion protruding radially outward along the battery, and a first anti-rotation groove is provided on the annular truncated portion; the insulating member is formed as an annular structure surrounding the circumferential sidewall of the electrode body, and a first protrusion portion is formed on the inner annular wall of the insulating member that can extend into the first anti-rotation groove, thereby realizing the circumferential positioning of the electrode body and the insulating member, and realizing the fixation between the electrode body and the insulating member; an assembly annular groove is provided on the outer annular wall of the insulating member, and a second protrusion portion is provided on the groove wall of the assembly annular groove; a press-fit component surrounds the insulating member. The circumferential sidewall of the insulating component has a first connecting part and a second connecting part that extend radially along the battery at both ends of the axial direction of the battery. The second connecting part is used to assemble the outer shell. The first connecting part has a second anti-rotation groove. The first connecting part extends into the assembly ring groove so that the second anti-rotation groove engages with the second protrusion. This achieves circumferential positioning of the pressing component and the insulating component, so that the electrode body, the insulating component and the pressing component can be assembled with the battery outer shell as a whole, simplifying the assembly process, improving assembly efficiency and thus improving the battery production efficiency.

[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is an exploded structural diagram of the pole assembly provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the electrode body in the electrode assembly provided in an embodiment of the present invention;

[0031] Figure 3 For along Figure 2 Cross-sectional view taken at point BB in the middle;

[0032] Figure 4 A schematic diagram showing the location of region S11 in the pole body of the pole assembly provided in the embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the press-fit component in the pole assembly provided in an embodiment of the present invention;

[0034] Figure 6 For along Figure 5 Cross-sectional view taken at point CC;

[0035] Figure 7 An exploded structural diagram of the electrode assembly assembled into a battery according to an embodiment of the present invention;

[0036] Figure 8 An axial cross-sectional view of the electrode assembly assembled into a battery according to an embodiment of the present invention;

[0037] Figure 9 for Figure 8 A magnified structural diagram of point P in the middle.

[0038] Icons: 10-Pole post body; 11-Ring platform; 111-First ring; 112-Second ring; 1121-First anti-rotation groove; 101-First groove; 102-Second groove; 20-Insulator; 21-Assembly ring groove; 30-Pressure fitting; 31-First connecting part; 311-Second anti-rotation groove; 32-Second connecting part; 40-Sealing part; 50-Battery casing; 51-Casing; 52-Cover plate; 60-Insulating disc; 70-Current collector; 80-Pole group. Detailed Implementation

[0039] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0040] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0041] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0042] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0043] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0044] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0045] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0046] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0047] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0048] According to a first aspect of the present invention, an electrode assembly is provided, which includes an electrode body 10, an insulating member 20, and a press-fit member 30.

[0049] The specific structure of the pole assembly according to this embodiment as described above will be described below.

[0050] In this embodiment, as Figures 1 to 6As shown, both the electrode body 10 and the press-fit component 30 are metal parts, such as copper, aluminum, etc. The electrode body 10 is formed into a block structure, and the circumferential sidewall of the electrode body 10 has an annular platform portion 11 that protrudes outward along the radial direction of the battery. The annular platform portion 11 is formed into an annular structure and is located at the middle position of the electrode body 10 in the axial direction of the battery. A first anti-rotation groove 1121 is provided on the annular platform portion 11. Preferably, multiple first anti-rotation grooves 1121 are provided, and multiple first anti-rotation grooves 1121 are equally spaced around the annular platform portion 11.

[0051] like Figure 1 As shown, the insulating member 20 is formed as an annular structure surrounding the circumferential sidewall of the electrode body 10. The insulating member 20 can be a plastic part made of materials such as PP or PPS, to provide insulation and protection for the electrode body 10. A first protrusion is formed on the inner annular wall of the insulating member 20, which can extend into the first anti-rotation groove 1121. The first protrusion can be a protrusion-shaped structure, so that after the insulating member 20 is sleeved on the electrode body 10, the first anti-rotation groove 1121 and the first protrusion engage to achieve a snap-fit ​​connection. This achieves circumferential positioning of the electrode body 10 and the insulating member 20, preventing relative rotation between the electrode body 10 and the insulating member 20, and fixing the electrode body 10 and the insulating member 20. In this embodiment, the first anti-rotation groove 1121 and the first protrusion are provided in a one-to-one correspondence.

[0052] Furthermore, such as Figure 1 As shown, an assembly ring groove 21 is formed on the outer annular wall of the insulating component 20. A second protrusion is provided on the groove wall of the assembly ring groove 21. The second protrusion can be a protrusion-shaped structure. The press-fit component 30 is formed as an annular structure surrounding the circumferential sidewall of the insulating component 20. The press-fit component 30 has a first connecting portion 31 and a second connecting portion 32 extending radially along the battery at both ends in the axial direction of the battery. The second connecting portion 32 is used to assemble the battery casing 50. Both the first connecting portion 31 and the second connecting portion 32 are formed as annular sheet-like or plate-like structures coaxial with the axial direction of the battery. The first connecting portion 31 and the second connecting portion 32 extend in opposite directions in the radial direction of the battery. Specifically, the first connecting portion 31 extends radially inward along the battery, and the second connecting portion 32 extends radially outward along the battery. Figure 5 and Figure 6 As shown, a second anti-rotation groove 311 is provided on the first connecting part 31. The second anti-rotation groove 311 is provided on the inner annular wall of the first connecting part 31. The first connecting part 31 extends into the assembly annular groove 21 so that the second anti-rotation groove 311 engages with the second protrusion. This achieves the positioning of the press-fit part 30 and the insulating part 20 in the circumferential direction, preventing relative rotation between the press-fit part 30 and the insulating part 20. This allows the electrode body 10, the insulating part 20 and the press-fit part 30 to be assembled with the battery shell as a whole, simplifying the assembly process, improving assembly efficiency, and thus improving the battery production efficiency.

[0053] Preferably, the first anti-rotation groove 1121 is filled with the first convex portion, and the second anti-rotation groove 311 is filled with the second convex portion, so that the anti-rotation effect among the pole body 10, the insulating member 20 and the press-fit member 30 is reliable.

[0054] It should be noted that, as Figure 7 As shown, the battery casing 50 includes a housing 51 and a cover plate 52. In a first optional embodiment, the terminal assembly is mounted on the cover plate 52; in a second optional embodiment, the terminal assembly is mounted on the housing 51. That is, the terminal assembly can be mounted on the housing 51 or on the cover plate 52. The electrode group 80, the current collector 70, and the insulating disk 60 are all assembled in the cavity inside the housing 51. Specifically, the two current collectors 70 are respectively disposed at both ends of the electrode group 80 in the axial direction, and the insulating disk 60 is installed between the current collector 70 connected to the terminal body 10 and the battery casing 50.

[0055] Furthermore, in this embodiment, as Figure 2 and Figure 4 As shown, the total projected area of ​​the first anti-rotation groove 1121 on a cross-section perpendicular to the battery axis is S, in mm. 2 For the location of S, see [reference needed]. Figure 2 As shown in the shaded area, the sum of the areas of the projections of all the first anti-rotation grooves 1121 onto a section perpendicular to the battery axis is S; S≥3mm 2 This ensures that the contact area between the first anti-rotation groove 1121 and the first convex portion has a reliable anti-rotation effect; the projected area of ​​the annular portion 11 on the cross section perpendicular to the battery axis is S1, in mm. 2 , Figure 4 The shaded area shown is S1; 10%≤S / S1≤90% ensures that the insulating part 20 and the pole body 10 have a certain torsional resistance. If S / S1 is too small, it will easily lead to insufficient torsional resistance. If S / S1 is too large, the pole body 10 will be slightly deformed.

[0056] The torsional resistance of the pole assembly after multiple assembly groups is tested to verify the reliability of the 10%≤S / S1≤90% limit condition in this application. The torsional resistance is qualified when the ultimate torque that can be withstood is ≥10N·m. The test results are shown in Table 1.

[0057] Table 1

[0058]

[0059] In this embodiment, as Figure 3As shown, the thickness of the annular portion 11 along the battery axis is A1, in mm; the groove depth of the first anti-rotation groove 1121 along the battery axis is A, in mm; 15%≤A / A1≤1, thus further improving the torsional resistance of the terminal assembly, avoiding the failure of the torsional resistance test due to the A / A1 parameter being too small, thus failing to meet the torsional resistance requirements of the terminal assembly.

[0060] The following tests were conducted on the torsional resistance of the pole assembly after multiple assembly sets to verify the reliability of the 15%≤A / A1≤1 constraint in this application. The torsional resistance is qualified when the ultimate torque that it can withstand is ≥10 N·m. The test results are shown in Table 2.

[0061] Table 2

[0062]

[0063] It should be noted that, in this application, the battery axis is... Figure 3 The vertical direction from the perspective of the battery is the radial direction. Figure 3 From a horizontal perspective, the battery axis is perpendicular to the battery radial direction.

[0064] Furthermore, in this embodiment, as Figure 1 , Figure 8 and Figure 9 As shown, the assembly ring groove 21 is provided on the side of the ring platform portion 11 facing the outside of the battery, so that the first connecting portion 31 can extend into the assembly ring groove 21; the overlapping area of ​​the projection of the first connecting portion 31 and the ring platform portion 11 on a section perpendicular to the battery axis is a ring structure, as shown. Figure 9 As shown, the distance between the inner and outer ring walls of the annular structure in the radial direction of the battery is L, 0.5mm≤L≤2mm. This ensures that the terminal assembly has a certain resistance to push and pressure. If the size of L is too small, the terminal body 10 will easily fall off. If the size of L is too large, the assembly difficulty, weight of parts and cost will increase accordingly.

[0065] like Figures 7 to 9 As shown, the terminal assembly also includes a seal 40, which is an elastic annular structure, such as a sealing ring. The seal 40 is sleeved on the circumferential sidewall of the end of the terminal body 10 facing the inside of the battery. In the axial direction of the battery, part of the seal 40 is sandwiched between the battery casing 50 and the terminal body 10, so that the seal 40 generates a compression amount, thereby realizing the sealed assembly of the terminal assembly and the battery casing 50.

[0066] Specifically, in this embodiment, such as Figure 2 , Figure 3 and Figure 9As shown, the ring section 11 includes a first ring section 111 and a second ring section 112 that are nested together radially in the battery. The first ring section 111 and the second ring section 112 are an integral structure. Figure 2 The dotted lines in the diagram are used to separate the positions of the first ring portion 111 and the second ring portion 112 on the ring platform portion 11. The first ring portion 111 is located on the radial inner side of the second ring portion 112, and the first anti-rotation groove 1121 is located on the second ring portion 112, so that the first ring portion 111 forms a closed ring structure and the second ring portion 112 forms an intermittent ring structure.

[0067] like Figure 9 As shown, the projection of the seal 40 and the first ring 111 on a cross section perpendicular to the battery axis coincides, so that the first ring 111 contacts the seal 40, that is, a portion of the seal 40 is sandwiched between the battery casing 50 and the first ring 111, so that the first ring 111 can compress the seal 40.

[0068] Preferably, the outer and inner ring walls of the first ring portion 111 have a radial dimension of M in the battery, where 0.8mm≤M≤2mm. This ensures that the contact area between the density component and the electrode body 10 provides reliable sealing performance for the sealing component 40, and also prevents the dimension of A from being too large, which would affect the rigidity of the electrode body 10 and improve the deformation resistance of the electrode body 10.

[0069] In this embodiment, as Figures 1 to 9 As shown, in the axial direction of the battery, the terminal body 10 has a first groove 101 at the end facing the outside of the battery and a second groove 102 at the end facing the inside of the battery. The first groove 101 and the second groove 102 are arranged opposite to each other in the axial direction of the battery. This reduces the thickness of the terminal body 10 in the axial direction of the battery, ensuring that the terminal body 10 can be smoothly welded to the current collector 70 and the busbar outside the battery, and reducing the impact of welding on the terminal assembly.

[0070] In the first optional embodiment, S11≤S12, C1≤C2, T≥1.3×P×S11 / (K×C1); in the second optional embodiment, S12≤S11, C2≤C1, T≥1.3×P×S12 / (K×C2); both embodiments can improve the performance of the battery before the battery explosion-proof valve is opened, and avoid the increased risk of deformation of the terminal body 10 or false alarms in the battery detection system.

[0071] It should be noted that in the two embodiments described above, S11 is the area of ​​the bottom of the first groove 101, in mm. 2 S12 is the area of ​​the bottom of the second groove 102, in mm. 2C1 is the perimeter of the bottom of the first groove 101, in mm; C2 is the perimeter of the bottom of the second groove 102, in mm; T is the distance between the bottom of the first groove 101 and the bottom of the second groove 102 along the battery axis, in mm, T≤ the total height of the electrode body 10 along the battery axis; P is the opening pressure of the battery explosion-proof valve, which can be installed on the cover plate 52 or on the housing 51, in MPa; K is the shear strength of the electrode body 10, in MPa.

[0072] According to the present invention, a battery includes a housing with a mounting hole, and an electrode assembly is assembled in the mounting hole; the battery includes an electrode body, a first insulating member, and a connector; one end of the electrode body facing the inside of the electrode assembly extends into the mounting hole; the first insulating member surrounds the circumferential sidewall of the end of the electrode body facing the outside of the electrode assembly; the connector surrounds the circumferential sidewall of the first insulating member; in the axial direction of the electrode assembly, the end of the connector facing the inside of the electrode assembly forms a first connecting portion that extends radially along the electrode assembly and can fit against the surface of the housing, the first connecting portion is welded to the housing to form a welded portion, and a sealing member is sandwiched between the side of the housing facing the outside of the electrode assembly and the electrode body, so that the electrode assembly can be welded directly to the housing from the outside of the housing as a whole via the connector, thereby reducing the axial dimension of the electrode body in the electrode assembly and the axial space occupied by the electrode body in the housing, thereby increasing the space utilization rate inside the electrode assembly and helping to improve the energy density of the electrode assembly. In addition, the terminal assembly is welded to the outer casing through connectors, which reduces the impact of welding on the first insulating component, ensures the insulation performance of the first insulating component, simplifies the assembly of the terminal assembly, improves the assembly efficiency of the terminal assembly, and further improves the assembly efficiency of the battery.

[0073] The battery provided by the present invention includes the terminal assembly as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0074] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A pole assembly, characterized by The pole post assembly comprises: a pole post body, a circumferential side wall of which is formed with a ring platform portion protruding radially outward of the battery, the ring platform portion being provided with a first rotation-stopping groove; an insulating member formed in an annular structure surrounding the circumferential side wall of the pole post body, an inner side wall of the insulating member being formed with a first protruding portion capable of extending into the first rotation-stopping groove, an outer side wall of the insulating member being provided with a fitting ring groove, a groove wall of the fitting ring groove being provided with a second protruding portion; a pressing member surrounding the circumferential side wall of the insulating member, the pressing member being formed at both ends in the axial direction of the battery with a first connecting portion and a second connecting portion extending in the radial direction of the battery, the first connecting portion and the second connecting portion extending in opposite directions in the radial direction of the battery; the first connecting portion being provided with a second rotation-stopping groove, the first connecting portion extending into the fitting ring groove so that the second rotation-stopping groove is in engagement with the second protruding portion, the second connecting portion being used for fitting the battery shell; The total area of the projection of the first rotation-stopping groove on a section perpendicular to the battery axial direction is S, in mm 2 ; S≥3 mm 2 ; the projection area of the ring table part on a section perpendicular to the battery axial direction is S1, in mm 2 ; 10%≤S / S1≤90%. in the axial direction of the battery, the thickness dimension of the ring platform portion is A1, unit: mm; in the axial direction of the battery, the groove depth of the first rotation-stopping groove is A, unit: mm; 15%≤A / A1≤1; in the axial direction of the battery, the fitting ring groove is arranged on the side of the ring platform portion facing the outside of the battery; the overlapping area of the projection of the first connecting portion and the ring platform portion in the cross section perpendicular to the axial direction of the battery is an annular structure, the distance between the inner side wall and the outer side wall of the annular structure in the radial direction of the battery is L, 0.5mm≤L≤2mm.

2. The pole assembly of claim 1, wherein Further comprising: a sealing member sleeved on the circumferential side wall of the end of the pole post body facing the inside of the battery; in the axial direction of the battery, part of the sealing member is clamped between the battery shell and the pole post body; the ring platform portion comprises a first ring portion and a second ring portion arranged in nesting in the radial direction of the battery, the first ring portion being arranged radially inward of the second ring portion, the first rotation-stopping groove being arranged on the second ring portion, the projection of the sealing member and the first ring portion in the cross section perpendicular to the axial direction of the battery being partially coincident; the size of the outer side wall and the inner side wall of the first ring portion in the radial direction of the battery is M, 0.8mm≤M≤2mm.

3. The pole assembly of claim 1, wherein, in the axial direction of the battery, the pole post body is provided with a first recess at the end facing the outside of the battery and a second recess at the end facing the inside of the battery, the first recess and the second recess being arranged opposite to each other in the axial direction of the battery.

4. The pole assembly of claim 3, wherein, S11≤S12, C1≤C2, T≥1.3×P×S11 / (K×C1); S11 is the area of the bottom of the first groove, in mm 2 S12 is the area of the bottom of the second groove, in mm 2 C1 is the perimeter of the bottom of the first groove, in mm; C2 is the perimeter of the bottom of the second groove, in mm; T is the distance between the bottom of the first groove and the bottom of the second groove in the axial direction of the battery, in mm; P is the opening pressure of the battery explosion-proof valve, in MPa; K is the shear strength of the pole body, in MPa.

5. The pole assembly of claim 3, wherein, S12≤S11, C2≤C1, T≥1.3×P×S12 / (K×C2); S11 is the area of the bottom of the first groove, in mm 2 ; S12 is the area of the bottom of the second groove, in mm 2 ; C1 is the circumference of the bottom of the first groove, in mm; C2 is the circumference of the bottom of the second groove, in mm; T is the distance between the bottom of the first groove and the bottom of the second groove in the axial direction of the battery, in mm; P is the opening pressure of the battery explosion-proof valve, in MPa; K is the shear strength of the pole body, in MPa.

6. The pole assembly of claim 1, wherein, the battery shell comprises a cover plate and a shell body; the pole post assembly is fitted on the cover plate or the pole post assembly is fitted on the shell body.

7. A battery, characterized by The pole post assembly comprises the pole post assembly according to any one of claims 1 to 6.

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