Pole and cover plate assembly

Abstract

The application relates to the technical field of batteries, in particular to a pole post and cover plate assembly. The pole post comprises a turn-up part, a post body part and a plate body part arranged along the axial direction of the pole post in sequence; the turn-up part can be folded outward away from the axis of the pole post; the inner side ring wall of the turn-up part is formed into a first wall part before being folded, the outer side ring wall of the turn-up part is formed into a second wall part extending along the axial direction of the pole post, at least part of the first wall part is arranged in an inclined mode, so that the thickness dimension of one end of the turn-up part away from the post body part in the radial direction of the pole post is smaller than the thickness dimension of one end of the turn-up part close to the post body part; the thickness dimension of one end of the turn-up part away from the post body part in the axial direction of the pole post is smaller than the thickness dimension of one end of the turn-up part close to the post body part in the axial direction of the pole post after being folded, so that the problem that the turn-up part is prone to warping after being pressed is solved, the post body part can be completely attached to the outer connecting sheet of the battery cell needing to be connected, the risk of false welding is reduced, and the welding reliability is improved.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, and the requirements for the performance and safety of lithium-ion batteries are becoming increasingly stringent.

[0003] The battery includes components such as a casing and a cover plate. The cover plate includes structures such as an upper plastic, terminals, a top cover plate, a lower plastic, and a sealing ring. After the terminals pass through the sealing ring, the lower plastic, the top cover plate, and the upper plastic, the circumferential edge of the terminals is pressed onto the upper plastic to form a pressing edge for press-fitting and fixing. Due to the limitations of the press-fitting process, the terminals cannot be completely flattened, causing the pressing edge to warp up and rise above the connecting piece on the terminals used to connect to the outside of the battery. This results in a gap between the connecting piece and the terminals, causing poor welding, reducing welding strength, affecting welding reliability, and consequently affecting the battery's performance. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a terminal post and cover plate assembly to solve the problem that the existing cover plate, which presses the terminal post onto the upper plastic, cannot flatten the surface of the terminal post facing the outside of the battery, the pressing edge is prone to warping, resulting in a gap between the external connecting parts of the battery and the terminal post, which increases the risk of poor soldering, reduces the welding strength, and fails to meet the usage requirements.

[0005] The first aspect of the present invention provides an electrode post, wherein the electrode post includes a flange portion, a column portion and a plate portion arranged sequentially along its axial direction; the flange portion is capable of being folded outward toward an axis away from the electrode post, such that the flange portion and the plate portion are arranged opposite to each other in the axial direction of the electrode post.

[0006] Before being folded, the flanged portion extends outward along the pole axis from one end of the column portion away from the plate portion; the flanged portion forms a ring structure both before and after folding.

[0007] Before folding, the inner annular wall of the flange portion is formed as a first wall portion, and the outer annular wall of the flange portion is formed as a second wall portion extending along the pole post axis. At least part of the first wall portion is inclined, such that before folding, the thickness of the end of the flange portion away from the pole body portion in the radial direction of the pole post is smaller than the thickness of the end of the flange portion close to the pole body portion in the radial direction of the pole post.

[0008] After folding, the second wall portion is positioned towards the plate portion, the first wall portion is positioned towards the outside of the cell, and the thickness of the end of the flange portion away from the column portion in the pole axis is smaller than the thickness of the end of the flange portion near the column portion in the pole axis.

[0009] Preferably, after folding, the second wall portion is parallel to the plate portion and the first wall portion does not protrude from the surface of the column portion facing the outside of the battery cell.

[0010] Preferably, before folding, the thickness of the end of the flange near the column body in the radial direction of the pole post is b, where 0.5mm≤b≤3mm.

[0011] Preferably, before folding, the thickness of the end of the flange furthest from the column in the radial direction of the pole is d, where 0.5×b≤d≤0.9×b.

[0012] Preferably, before folding, the height dimension of the flange in the axial direction of the pole post is e, and e / b≥1.5.

[0013] Preferably, 1.5mm ≤ e ≤ 5mm.

[0014] Preferably, a portion of the first wall portion is inclined, such that the first wall portion includes an inclined segment and a straight segment, the inclined segment being disposed at the end of the flange portion away from the column portion; before folding, the height dimension of the straight segment in the axial direction of the pole column is a, a≤e / 3.

[0015] Preferably, before folding, the height dimension of the inclined section in the axial direction of the pole column is c, where 1mm≤c≤5mm.

[0016] A second aspect of the present invention provides a cover plate assembly, including the pole as described in any of the above technical solutions, a cover plate body, a first insulating member, a second insulating member, and a sealing member;

[0017] The cover plate body has an installation hole for the column portion to pass through. The first insulating member is sandwiched between the flange portion and the cover plate body. The second insulating member is sandwiched between the plate portion and the cover plate body. The sealing member is sleeved on the column portion.

[0018] Preferably, the cover plate body is provided with an exhaust hole;

[0019] The cover plate assembly also includes:

[0020] Pressure relief component, installed at the exhaust port;

[0021] A protective element is attached to the side of the cover plate body facing the outside of the battery cell to cover the vent hole.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The pole post of the present invention includes a flange portion, a column portion, and a plate portion arranged sequentially along its axial direction; the flange portion is capable of being folded outward toward an axis away from the pole post, such that the flange portion and the plate portion are arranged opposite to each other in the axial direction of the pole post; before folding, the flange portion extends outward along the axial direction of the pole post from one end of the column portion away from the plate portion; the flange portion is formed as a ring structure both before and after folding; before folding, the inner ring wall of the flange portion is formed as a first wall portion, and the outer ring wall of the flange portion is formed as a second wall portion extending along the axial direction of the pole post, at least a portion of the first wall portion is inclined, such that before folding, the end of the flange portion away from the column portion is radially opposite to the pole post. The thickness of the flange portion is smaller than the thickness of the end of the flange portion near the column portion in the radial direction of the electrode post. After folding, the second wall portion faces the plate portion, and the first wall portion faces the outside of the cell. The thickness of the flange portion away from the column portion in the axial direction of the electrode post is smaller than the thickness of the flange portion near the column portion in the axial direction of the electrode post. This ensures that the first wall portion does not protrude from the surface of the column portion after folding, which to some extent improves the problem of the flange portion easily lifting after pressing. It ensures that the column portion can completely fit the external connecting piece that the cell needs to be connected to, thereby reducing the risk of poor soldering, improving the welding reliability, and thus meeting the usage requirements.

[0024] 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of the flanged portion on the pole before folding, provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0028] Figure 3 This is a schematic diagram of the structure of the flanged portion on the pole post after folding, provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the flanged portion on the pole post after being folded and assembled with the outer connecting piece according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of the present invention;

[0031] Figure 6 This is a structural cross-sectional view of the cover plate assembly provided in an embodiment of the present invention;

[0032] Figure 7 This is an exploded view of the cover plate assembly provided in an embodiment of the present invention.

[0033] Icons: 10-Pole post; 11-Flanged edge; 111-First wall section; 1111-Inclined section; 1112-Straight section; 112-Second wall section; 12-Column section; 13-Plate section; 20-Cover plate body; 21-Mounting hole; 22-Exhaust hole; 30-First insulating component; 40-Second insulating component; 50-Sealing component; 60-Pressure relief component; 70-Protective component; 100-External connecting piece; 101-Welding part. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] According to a first aspect of the present invention, a pole post is provided.

[0044] The specific structure of the pole according to this embodiment will be described below.

[0045] In this embodiment, as Figures 1 to 3 As shown, the pole post 10 includes a flanged portion 11, a columnar portion 12, and a plate portion 13 arranged sequentially along its axial direction. The columnar portion 12 can be formed into a cylindrical or polygonal prism-shaped structure. The plate portion 13 is formed into a plate-shaped structure protruding from the circumferential edge of the columnar portion 12, and it can be a circular, elliptical, or polygonal plate-shaped structure. The pole lug is mounted on the surface of the plate portion 13 away from the columnar portion 12. It should be noted that the radial direction of the pole post 10 indicates the direction perpendicular to the axial direction of the pole post 10, and does not mean that the circumferential outer edge of the pole post 10 is necessarily circular.

[0046] like Figure 1 and Figure 3 As shown, the flange 11 is provided on the end of the column portion 12 opposite to the plate portion 13, and can be folded outward toward the axis away from the pole post 10, so that the flange 11 protrudes from the circumferential outer edge of the column portion 12 in the radial direction of the pole post 10 and is arranged opposite to the plate portion 13 in the axial direction of the pole post 10, thus realizing the press-fitting of the cover plate assembly.

[0047] Specifically, such as Figure 1 As shown, before folding, the flange 11 extends outward along the axial direction of the pole post 10 from one end of the column portion 12 away from the plate portion 13; the flange 11 is formed as a ring structure both before and after folding. Before folding, the flange 11 is formed as a ring structure at one end of the column portion 12 in the axial direction, and after folding, the flange 11 is formed as a ring structure at the outer edge of the column portion 12 in the radial direction.

[0048] More specifically, such as Figure 1 and Figure 2 As shown, before folding, the inner annular wall of the flange 11 is formed as a first wall 111, and the outer annular wall of the flange 11 is formed as a second wall 112 extending axially along the pole post 10. At least a portion of the first wall 111 is inclined, such that before folding, the thickness of the end of the flange 11 away from the pole body 12 in the radial direction of the pole post 10 is smaller than the thickness of the end of the flange 11 near the pole body 12 in the radial direction of the pole post 10; thus, after folding, as... Figure 3 and Figure 4 As shown, the second wall portion 112 is disposed towards the plate portion 13, and the first wall portion 111 is disposed towards the outside of the cell. The thickness of the flange portion 11 at the end away from the column portion 12 in the axial direction of the electrode post 10 is smaller than the thickness of the flange portion 11 at the end near the column portion 12 in the axial direction of the electrode post 10. This ensures that after folding, the first wall portion 111 does not protrude from the surface of the column portion 12. Figure 4As shown, the external connecting piece 100 can be attached to the surface of the column portion 12 facing the outside of the battery cell and welded to the column portion 12 to form a welding portion 101. The welding portion 101 can be formed into a ring structure, which to a certain extent improves the problem of easy lifting of the flange portion 11 after pressing, and ensures that the column portion 12 can be completely attached to the external connecting piece 100 that the battery cell needs to be connected, thereby reducing the risk of poor soldering, improving the welding reliability, and thus meeting the usage requirements.

[0049] Furthermore, such as Figure 3 and Figure 4 As shown, the folding angle is preferably 90 degrees, so that after folding, the second wall portion 112 is parallel to the plate portion 13 and the first wall portion 111 does not protrude from the surface of the column portion 12 facing the outside of the battery cell. This ensures that the folded edge portion 11 will not curl upward and protrude from the surface of the column portion 12, which helps to eliminate the gap between the outer connecting piece 100 and the pole post 10, and ensures that there is a reliable contact area between the outer connecting piece 100 and the column portion 12, thereby ensuring reliable welding.

[0050] In this embodiment, as Figure 2 As shown, before folding, the thickness of the end of the flange 11 near the column 12 in the radial direction of the pole post 10 is b, 0.5mm≤b≤3mm, thus ensuring that the flange 11 has sufficient structural strength and is easy to fold.

[0051] Furthermore, in this embodiment, as Figure 2 As shown, before folding, the thickness of the end of the flange 11 away from the column 12 in the radial direction of the pole post 10 is d, 0.5×b≤d≤0.9×b. This ensures that the flange 11 will not warp after folding, while also ensuring the strength of the flange. This makes the flange 11 reliably press-fit other parts on the cover plate assembly after folding, thus making the pole post 10 firmly assembled.

[0052] Furthermore, in this embodiment, as Figure 2 As shown, before folding, the height dimension of the flange 11 in the axial direction of the pole post 10 is e, and e / b≥1.5, so as to further improve the reliability of the flange 11 press-fitting and reduce the risk of the pole post 10 falling off under vibration or impact.

[0053] In a preferred embodiment, 1.5mm ≤ e ≤ 5mm.

[0054] In addition, such as Figure 2 As shown, in this embodiment, a portion of the first wall portion 111 is inclined, such that the first wall portion 111 includes an inclined segment 1111 and a straight segment 1112. The inclined segment 1111 is located at the end of the flange portion 11 away from the column portion 12. Before folding, the height dimension of the straight segment 1112 in the axial direction of the pole column 10 is a, where a≤e / 3. Preferably, 0≤a≤5 / 3mm.

[0055] Furthermore, before folding, the height dimension of the inclined section 1111 in the axial direction of the pole post 10 is c, where 1mm ≤ c ≤ 5mm. This ensures that after folding, the first wall portion 111 of the flanged portion 11 is lower than the side of the pole portion 12 facing the outside of the cell, creating a gap between the first wall portion 111 and the outer connecting piece 100, thereby improving the reliability of the welding assembly of the outer connecting piece 100 and the pole post 10.

[0056] The reliability of the limiting conditions of 0.5mm≤b≤3mm, 0.5×b≤d≤0.9×b, e / b≥1.5, 1.5mm≤e≤5mm, a≤e / 3, and 1mm≤c≤5mm in this invention is verified through multiple sets of tests. The test results are shown in Tables 1 and 2.

[0057] Table 1

[0058]

[0059] Table 2

[0060]

[0061] As shown in Table 1, in Examples 1 to 10, the parameters are all within the range of 0.5mm≤b≤3mm, 0.5×b≤d≤0.9×b, e / b≥1.5, 1.5mm≤e≤5mm, a≤e / 3, and 1mm≤c≤5mm. The flange 11 folds smoothly and the folded part is lower than the surface of the column part 12 after folding, which meets the welding requirements. In addition, it ensures that the pressing strength meets the sealing and pushing torque strength requirements of the cover plate assembly, so that the pole post 10 is not easy to fall off within a certain stress range.

[0062] As shown in Table 2, in Comparative Examples 1 and 2, the parameter e / b is too small, causing the dimensions of the flanged part 11 to not meet the pressing requirements, thus preventing folding. In Comparative Examples 3 and 4, the length of the straight segment 1112 is too large, failing to meet the constraint a≤e / 3, resulting in a portion of the flanged part 11 protruding from the outer surface of the column part 12 along the axial direction of the pole post 10 after folding. This causes a gap between the column part 12 and the outer connecting piece 100, affecting the welding between the pole post 10 and the outer connecting piece 100. In Comparative Examples 5 and 6, the dimension d... If the size is too small, the condition of 0.5×b≤d is not met, resulting in poor edge pressing of the flange 11 and the torque strength of the pole post 10 cannot meet the requirements, posing a risk of the pole post 10 loosening. In Comparative Examples 7 and 8, if the size of d is too large, the condition of d≤0.9×b is not met, resulting in a part of the flange 11 protruding from the outer surface of the column part 12 in the axial direction of the pole post 10 after folding, resulting in a gap between the column part 12 and the outer connecting piece 100, affecting the welding of the pole post 10 and the outer connecting piece 100.

[0063] According to the present invention, a pole post includes a flange portion, a column portion, and a plate portion arranged sequentially along its axial direction. The flange portion is capable of being folded outward toward an axis away from the pole post, such that the flange portion and the plate portion are arranged opposite to each other in the axial direction of the pole post. Before folding, the flange portion extends outward along the axial direction of the pole post from one end of the column portion away from the plate portion. The flange portion is formed as a ring structure both before and after folding. Before folding, the inner ring wall of the flange portion is formed as a first wall portion, and the outer ring wall of the flange portion is formed as a second wall portion extending along the axial direction of the pole post. At least a portion of the first wall portion is inclined, such that before folding, the end of the flange portion away from the column portion is inclined towards the pole post. The radial thickness of the column is less than the radial thickness of the end of the flange near the column in the pole post. After folding, the second wall faces the plate, and the first wall faces the outside of the cell. The axial thickness of the end of the flange away from the column is less than the axial thickness of the end of the flange near the column in the pole post. This ensures that the first wall does not protrude from the surface of the column after folding, which to some extent improves the problem of the flange easily lifting after pressing. It ensures that the column can fully fit the external connecting piece that the cell needs to be connected to, thereby reducing the risk of poor soldering, improving welding reliability, and meeting the usage requirements.

[0064] According to the present invention, a cover plate assembly includes a pole post 10, a cover plate body 20, a first insulating member 30, a second insulating member 40, and a sealing member 50 as described above.

[0065] In this embodiment, the cover plate body 20 is a metal part, such as aluminum or steel; the first insulating part 30 and the second insulating part 40 are insulating plastic parts, such as PP or PPS; the sealing part 50 can be a sealing ring made of fluororubber.

[0066] Specifically, such as Figures 5 to 7 As shown, the cover plate body 20 is formed into a plate-like structure, and the cover plate body 20 is provided with a mounting hole 21 for the column part 12 to pass through; the first insulating member 30 is formed into an annular structure sleeved on the column part 12, and in the axial direction of the pole post 10, the first insulating member 30 is sandwiched between the flange part 11 and the cover plate body 20. Preferably, part of the first insulating member 30 covers the circumferential sidewall of the flange part 11 after folding.

[0067] More specifically, such as Figures 5 to 7As shown, the second insulating member 40 is attached to the side of the cover plate body 20 facing the inside of the cell, used to separate the cover plate body 20 from the insulation inside the cell. A portion of the second insulating member 40 is sandwiched between the plate body portion 13 and the cover plate body 20 along the axial direction of the pole post 10. The sealing member 50 is sleeved on the pole body portion 12. A portion of the sealing member 50 is sandwiched between the plate body portion 13 and the cover plate body 20 along the axial direction of the pole post 10, and a portion of the sealing member 50 is sandwiched between the plate body portion 13 and the first insulating member 30. The sealing member 50 undergoes compression deformation after assembly to ensure the sealing performance of the cover plate body 20.

[0068] Furthermore, in this embodiment, as Figures 5 to 7 As shown, the cover plate body 20 has an exhaust hole 22, which is a through hole penetrating the cover plate body 20. The cover plate assembly also includes a pressure relief component 60 and a protective component 70. The pressure relief component 60 can be an explosion-proof valve. When the internal pressure of the battery cell reaches the pressure that needs to be vented, the pressure relief component 60 opens to allow the gas inside the battery cell to be released, thereby relieving pressure. The pressure relief component 60 is installed on the exhaust hole 22, and the circumferential sidewall of the pressure relief component 60 is welded to the hole wall of the exhaust hole 22. Preferably, the pressure relief component 60 is installed on the side of the exhaust hole 22 facing the inside of the battery cell. The protective component 70 can be an explosion-proof valve protective patch. The protective component 70 is affixed to the side of the cover plate body 20 facing the outside of the battery cell to cover the exhaust hole 22 and prevent external components of the battery cell from damaging the pressure relief component 60, causing the pressure relief component 60 to open prematurely.

[0069] The cover plate assembly provided according to the present invention includes the pole as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0070] 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, characterized in that The pole post comprises a flange part, a post part and a plate part arranged in sequence along the axial direction of the pole post; the flange part can be folded outwardly away from the axial line of the pole post, so that the flange part and the plate part are arranged opposite to each other in the axial direction of the pole post; The flange part extends outwardly in the axial direction of the pole post from one end of the post part away from the plate part before being folded; the flange part forms a ring structure before and after being folded; Before being folded, the inner ring wall of the flange part forms a first wall part, and the outer ring wall of the flange part forms a second wall part extending in the axial direction of the pole post; at least part of the first wall part is arranged obliquely, so that the thickness dimension of the one end of the flange part away from the post part in the radial direction of the pole post is smaller than the thickness dimension of the one end of the flange part close to the post part in the radial direction of the pole post before being folded; After being folded, the second wall part is arranged towards the plate part, the first wall part is arranged towards the outside of the battery cell, and the thickness dimension of the one end of the flange part away from the post part in the axial direction of the pole post is smaller than the thickness dimension of the one end of the flange part close to the post part in the axial direction of the pole post; After being folded, the second wall part is parallel to the plate part, and the first wall part does not protrude from the surface of the post part facing the outside of the battery cell; Before being folded, the thickness dimension of the one end of the flange part close to the post part in the radial direction of the pole post is b, and 0.5mm≤b≤3mm; Before being folded, the thickness dimension of the one end of the flange part away from the post part in the radial direction of the pole post is d, and 0.5×b≤d≤0.9×b; Before being folded, the height dimension of the flange part in the axial direction of the pole post is e, and e / b≥1.5; 1.5mm≤e≤5mm; Part of the first wall part is arranged obliquely, so that the first wall part comprises an oblique segment and a straight segment, and the oblique segment is arranged at the one end of the flange part away from the post part; before being folded, the height dimension of the straight segment in the axial direction of the pole post is a, and a≤e / 3; Before being folded, the height dimension of the oblique segment in the axial direction of the pole post is c, and 1mm≤c≤5mm.

2. A cover plate assembly characterized by, The pole post assembly comprises the pole post, a cover plate body, a first insulating piece, a second insulating piece and a sealing piece; The cover plate body is provided with a mounting hole through which the post part passes, the first insulating piece is clamped between the flange part and the cover plate body, the second insulating piece is clamped between the plate part and the cover plate body, and the sealing piece is sleeved on the post part.

3. The cover plate assembly of claim 2, wherein, The cover plate body is provided with an exhaust hole; The cover plate assembly further comprises: A pressure relief piece installed on the exhaust hole; A protection piece attached to one side of the cover plate body facing the outside of the battery cell to cover the exhaust hole.

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