Pole structure, cover plate assembly and battery

Abstract

The invention relates to the technical field of batteries, and discloses a pole structure, a cover plate assembly and a battery. The pole structure comprises: a plate body; the column body comprises a first column part and a second column part, the first column part is fixedly connected between the plate body and the second column part, and the first column part is suitable for being arranged in a pole hole in the cover plate body in a penetrating manner; the first column part at least comprises two arc-shaped areas which are oppositely arranged in the length direction, and the diameter of each arc-shaped area is D; avoiding spaces are formed in the two sides, in the width direction, of the first column part respectively, the avoiding spaces are formed by recessing partial areas of the peripheral face of the first column part in the width direction, the recessing depth of each avoiding space in the width direction is n, and 2n / D is larger than or equal to 0.05 and smaller than or equal to 0.1. Therefore, the avoidance space can be ensured to provide enough material expansion space, the consistency of the width of the plate body after riveting is ensured, the resistance between the surface of the riveting block and the plate body can be prevented from being too large, the heating value in the charging and discharging process is reduced, and the over-current capability of the pole structure is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a pole structure, a cover plate assembly and a battery. Background Art

[0002] The riveted cover is composed of a cover body, a riveting block, an upper plastic, a pole, a lower plastic, a sealing ring and other structures. The pole is inserted into the through hole on the cover body and the through hole on the riveting block, and the pole is riveted to the cover body through the riveting block. After riveting, the pole expands in a direction perpendicular to the axis of the pole, squeezing the cover body. However, the width of the blade battery cover body is relatively small. After the pole is riveted to the cover body, it is easy to cause the cover body to expand and deform severely in the width direction. The edge of the cover body is propped outward by the pole, causing the width of the cover body to exceed the tolerance, that is, the width consistency of the cover body is poor, which in turn leads to problems such as difficulty in assembling the shell cover and poor welding. Summary of the Invention

[0003] In view of this, the present invention provides a pole structure, a cover plate assembly and a battery to solve the problem that the cover plate body of the riveted cover plate is easily squeezed by the pole and deformed, resulting in poor width consistency of the cover plate body.

[0004] In a first aspect, the present invention provides a pole structure, comprising: a plate body; a column body, comprising a first column portion and a second column portion, the first column portion being fixedly connected between the plate body and the second column portion, the first column portion being suitable for being inserted into a pole hole on a cover plate body; the first column portion comprising at least two arc-shaped areas arranged opposite to each other along a length direction, the diameter of the arc-shaped areas being D; avoidance spaces are respectively formed on both sides of the first column portion along a width direction, the avoidance spaces being formed by recessing a portion of an outer peripheral surface of the first column portion along a width direction, the recessed depth of each avoidance space along the width direction being n, wherein 0.05≤2n / D≤0.1.

[0005] Beneficial effect: By optimizing the existing pole structure, an avoidance space is added in the width direction of the first column part that cooperates with the cover plate body, and space is reserved for the expansion of the first column part during the riveting process of the pole structure, meeting the expansion demand of the first column part, avoiding the first column part from excessively squeezing the side wall of the pole hole in the width direction, resulting in an excessive width of the cover plate body, ensuring the consistency of the width of the cover plate body after riveting, and avoiding problems such as difficulty in assembling the shell cover and poor welding; and, by limiting the dimension n of the unilateral avoidance space in the width direction and the maximum dimension D of the first column part in the width direction when the avoidance space is not processed to meet the relationship of 0.05≤2n / D≤0.1, the recessed size of the avoidance space in the width direction is limited to a reasonable range, which can ensure that the avoidance space can provide sufficient expansion space, thereby ensuring the consistency of the width of the cover plate body after riveting, and avoiding the avoidance space in the width direction being too large, resulting in excessive resistance between the rivet block surface and the plate body, thereby reducing the heat generated during charging and discharging, improving the safety of the battery, and ensuring the overcurrent capacity of the pole structure, ensuring the charging and discharging performance of the battery.

[0006] In an optional embodiment, the first column portion further includes a rectangular area connected between the two arc-shaped areas, and a size of the rectangular area along the width direction is W0, wherein W0=D-2n.

[0007] Beneficial effect: By adding the rectangular area, the cross-sectional area of ​​the first column portion is increased, thereby increasing the current capacity of the pole structure, and by setting the width W0 of the rectangular area equal to the difference between the diameter D of the arc area and the size of the avoidance space along the width direction, it is explained that the avoidance space is a recessed portion formed on both sides of the width direction of the traditional runway-type pole, thereby ensuring that when the pole structure is riveted, the avoidance space can provide material expansion space along the width direction.

[0008] In an optional embodiment, the diameter D of the arc-shaped area is in the range of: 4 mm ≤ D ≤ 30 mm;

[0009] And / or, the range of the recessed depth n of each of the avoidance spaces along the width direction is: 0.05 mm ≤ n ≤ 1.5 mm.

[0010] Beneficial Effect: By limiting the diameter D of the arc area to a value within the range of 4 mm to 30 mm, it is possible to ensure that the pole structure can meet the minimum push-pull force requirements, thereby ensuring the reliability of the pole structure and the performance and safety of the battery, while also avoiding excessive size and weight of the pole structure, thereby facilitating lightweighting of the battery cell.

[0011] By setting the recess depth n of each avoidance space along the width direction to a value within the range of 0.05mm to 1.5mm, the minimum cold heading die accuracy requirement can be met, and the avoidance space 201 can be ensured to provide sufficient material expansion space, while also ensuring the conductive performance and structural strength of the pole structure.

[0012] In an optional embodiment, the second column portion is runway-shaped, and the circumferential dimension of the first column portion is larger than the circumferential dimension of the second column portion. A first ring portion is formed between the outer contour of the positive projection of the second column portion on the first column portion in the up and down directions and the outer contour of the upper surface of the first column portion. The ring width of the first ring portion is K, wherein K and n satisfy the relationship: 0.3≤n / K≤0.8.

[0013] Beneficial effect: By setting n / K to a value between 0.3 and 0.8, it is possible to avoid space and reduce the difficulty of processing and manufacturing, ensuring the smooth formation of the pole structure, and ensure that the first column can provide sufficient support for the riveted block, avoiding bending and deformation of the riveted block when under pressure, thereby ensuring the flatness of the riveted block and improving the qualified rate of the battery.

[0014] In an optional embodiment, the ring width dimension K of the first ring portion has a value range of: 0.4 mm ≤ K ≤ 2.5 mm.

[0015] Beneficial effect: By limiting the ring width K of the first ring portion to a value within the range of 0.4mm to 2.5mm, it is possible to ensure that the first column portion has sufficient supporting area for the rivet block, provide sufficient support for the rivet block, avoid riveting pressure and damage the fitting surface between the rivet block and the first column portion, thereby improving the qualified rate of the battery, and avoid excessive weight of the first column portion and waste of materials.

[0016] In an optional embodiment, the length of the plate is L1, and the maximum length of the first column is L0, wherein 0.25≤L0 / L1≤0.75;

[0017] And / or, the dimension of the plate along the width direction is W1, wherein W1 and D satisfy the relationship: 0.3≤D / W1≤0.7.

[0018] Beneficial effect: By setting the L0 / L1 value between 0.25 and 0.75, it can ensure that the terminal structure can be smoothly formed and avoid bending deformation due to excessive length of the plate body. It can also ensure the compression ability of the plate body on the sealing ring, thereby ensuring the sealing performance, avoiding electrolyte leakage, and improving battery safety.

[0019] By limiting the value of D / W1 to between 0.3 and 0.7, it is possible to ensure that the pole structure is smoothly formed and that the plate body compresses the sealing ring on both sides in the width direction, thereby ensuring the sealing performance.

[0020] In an optional embodiment, the dimension L1 of the plate along the length direction is in the range of: 6 mm ≤ L1 ≤ 45 mm;

[0021] And / or, the maximum dimension L0 of the first column portion along the length direction has a value range of: 4mm<L0≤45mm.

[0022] Beneficial effects: By limiting the length of the plate to a value between 6mm and 45mm, it is possible to ensure that the plate has sufficient length, thereby ensuring the length requirement for welding with the tab, ensuring the welding area and welding quality between the plate and the tab, and avoiding bending and deformation of the plate due to excessive length, reducing the risk of excessive flatness of the plate, thereby further ensuring the compression performance of the plate on the sealing ring and the welding quality between the plate and the tab, and ensuring the qualified rate of the battery;

[0023] By limiting the length of the first column portion to a value within the range of 4 mm to 45 mm, it is possible to ensure that the pole structure can meet the minimum tensile force requirement of the pole structure, thereby ensuring the reliability of the pole structure and the electrical connection reliability and mechanical stability of the battery during use, while also avoiding excessive weight of the pole structure and avoiding waste of materials.

[0024] In a second aspect, the present invention further provides a cover plate assembly, comprising: a cover plate body having a pole hole defined therein; a rivet block disposed on one side of the cover plate body, the rivet block having a rivet hole corresponding to the pole hole defined therein; the aforementioned pole structure, wherein the plate body of the pole structure is located on a side of the cover plate body facing away from the rivet block, the first pole portion being inserted into the pole hole, and the second pole portion being inserted into the rivet hole; and a sealing ring disposed between the first pole portion and the pole hole. Because the cover plate assembly includes the pole structure and has the same effects as the pole structure, further description thereof will not be given here.

[0025] In an optional embodiment, the pole hole is runway-shaped, the size of the pole hole along the width direction is W2, the sealing ring includes a second ring portion, the second ring portion is located between the outer circumference of the first column portion and the pole hole, and the ring width of the second ring portion is M, wherein W2, M and D satisfy the relationship:

[0026] Beneficial effect: By limiting Selecting a value between 0.15mm and 0.6mm can ensure smooth assembly of the cover body, sealing ring and pole structure, ensure the stability and sealing of the assembled structure, and thus improve the reliability of the battery.

[0027] In a third aspect, the present invention further provides a battery comprising: a housing having an open end; a pole group disposed within the housing; and the aforementioned cover assembly, the cover assembly being disposed over the open end of the housing. Because the battery includes a pole structure, it has the same effects as the pole structure and will not be further described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of a pole structure according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A front view of the pole structure shown;

[0031] Figure 3 for Figure 1 A top view of the pole structure shown;

[0032] Figure 4 for Figure 3 A partial enlarged schematic diagram of the pole structure shown;

[0033] Figure 5 This is a schematic structural diagram of another pole structure according to an embodiment of the present invention;

[0034] Figure 6 for Figure 5 A front view of the pole structure shown;

[0035] Figure 7 for Figure 5 A top view of the pole structure shown;

[0036] Figure 8 for Figure 7 A partial enlarged schematic diagram of the pole structure shown;

[0037] Figure 9 for Figure 8 A partial enlarged schematic diagram of D in the middle;

[0038] Figure 10A top view of a cover plate assembly before riveting according to an embodiment of the present invention;

[0039] Figure 11 for Figure 10 Cross-sectional view in the AA direction;

[0040] Figure 12 for Figure 10 Cross-sectional view in the middle BB direction;

[0041] Figure 13 A top view of a cover plate body according to an embodiment of the present invention;

[0042] Figure 14 for Figure 13 Cross-sectional view in CC direction;

[0043] Figure 15 This is a schematic structural diagram of a sealing ring according to an embodiment of the present invention;

[0044] Figure 16 for Figure 15 A cross-sectional view of the sealing ring shown;

[0045] Figure 17 This is a schematic diagram of the pole structure before improvement;

[0046] Figure 18 for Figure 17 A top view of the pole structure shown;

[0047] Figure 19 This is an exploded view of the riveted cover assembly before improvement.

[0048] Description of reference numerals:

[0049] 1. Plate body; 2. Column; 201. Avoidance space; 202. First ring portion; 203. Chamfer; 210. First column portion; 211. Rectangular area; 212. Arc area; 220. Second column portion; 3. Cover body; 301. Pole hole; 3011. Fourth hole section; 3012. Fifth hole section; 302. Explosion-proof valve hole; 4. Riveted block; 401. Riveted hole; 402. First hole section; 403. Second hole section; 404. Third hole section; 5. Sealing ring; 501. Second ring portion; 502. Third ring portion; 6. First plastic part; 601. First through hole; 7. Second plastic part; 701. Second through hole; 8. Explosion-proof valve; 801. Explosion-proof patch. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0051] The cover plate assembly is a key component in the battery. Its function is to weld with the shell to form a sealed cavity, lead out the positive and negative electrodes of the electrode group, and serve as an assembly carrier. The traditional riveted cover plate consists of the cover plate body, riveted block, upper plastic, pole, lower plastic, sealing ring and other structures. In combination with the trend of lightweight structural parts and simplified structure, the cover plate of the blade battery is currently simplified from a double cylindrical pole to a runway-type single pole structure (such as Figure 19 (As shown). After the pole is riveted, the post expands radially. Since the blade cover is relatively narrow, the width of the cover is significantly affected. After riveting, the pole expands the cover along its width, causing the cover to be out of tolerance. This, in turn, leads to difficulties in assembling the housing cover and an increase in weld defects. Therefore, it is crucial to address the issue of the riveted cover expanding and deforming along its width, resulting in out-of-tolerance cover width, caused by compression and deformation in the pole post area after riveting.

[0052] The following combination Figures 1 to 19 , describing embodiments of the present invention.

[0053] According to an embodiment of the present invention, on the one hand, a pole structure is provided, such as Figures 1 to 9 As shown, the pole structure includes: a plate body 1 and a column body 2, the column body 2 includes a first column portion 210 and a second column portion 220, the first column portion 210 is fixedly connected between the plate body 1 and the second column portion 220, and the first column portion 210 is suitable for being inserted into the pole hole 301 on the cover body 3; the first column portion 210 includes at least two arc-shaped areas 212 arranged opposite to each other along the length direction, and the diameter of the arc-shaped area 212 is D; avoidance spaces 201 are respectively formed on both sides of the first column portion 210 along the width direction, and the avoidance spaces 201 are formed by recessing a portion of the outer circumference of the first column portion 210 along the width direction. The recessed depth of each avoidance space 201 along the width direction is n, wherein 0.05≤2n / D≤0.1, and the units of n and D are both mm.

[0054] The length direction refers to Figures 2 to 4 、 Figures 6 to 8 The "length direction" indicated by the arrow in the middle is Figure 10 The "length direction" of the middle cover assembly is the same direction; the width direction refers to Figures 3 and 4 、 Figures 7 and 8 The "width direction" indicated by the arrow in the middle is Figure 10 The "width direction" of the middle cover assembly is in the same direction; the avoidance space 201 is formed by a recessed portion of the side surfaces on both sides of the width direction on the outer peripheral surface of the first column portion 210, specifically, it is recessed along the width direction toward the inside of the first column portion 210.

[0055] It should be noted that the pole structure of this embodiment is an improvement on the traditional pole structure. The cross-sectional area of ​​the first pole portion of the traditional pole structure is circular or runway-shaped, and the diameter D of the arc region 212 is the maximum dimension of the first pole portion along the width direction; the avoidance space 201 of this embodiment is formed by a partial area of ​​the outer peripheral surface of the first pole portion 210 being recessed in a direction perpendicular to the axis of the column 2 and toward the axial direction close to the column 2; when the cross-sectional area of ​​the first pole portion of the traditional pole structure is runway-shaped, the avoidance space 201 is formed on the straight segment of the runway shape; when the cross-sectional area of ​​the first pole portion of the traditional pole structure is circular, the first pole portion is spliced ​​by two arc regions 212, and the interface of the two arc regions 212 passes through the avoidance space 201; the diameter D of the arc region 212 is the maximum dimension of the first pole portion of the traditional pole structure along the width direction, that is, the diameter D of the arc region 212 is the maximum dimension of the front width direction of the unprocessed avoidance space 201 of the first pole portion 210.

[0056] If 2n / D is greater than 0.1, the avoidance space 201 will be excessive in size along the width direction, and the cross-sectional area of ​​the first column portion 210 will be small, which will lead to a high resistance between the surface of the riveted block 4 and the plate body 1. This will cause high heat generation during charging and discharging, and the battery temperature will rise too quickly, posing a major safety hazard and affecting the current capacity of the terminal structure. If 2n / D is less than 0.05, the avoidance space 201 will be insufficient. After riveting, the first column portion 210 will expand in the width direction and become larger in size, causing the first column portion 210 to squeeze and expand the terminal hole 301 along the width direction, resulting in an excessive width of the cover plate body 3 and poor width consistency of the cover plate body. The cross section refers to the projection of the column on a section perpendicular to its axis.

[0057] The pole structure of this embodiment is applied, and by optimizing the existing pole structure, an avoidance space 201 is added in the width direction of the first column portion 210 that matches the cover plate body 3, so that space is reserved for the expansion of the first column portion 210 during the riveting process of the pole structure, so as to meet the expansion demand of the first column portion 210, avoid the first column portion 210 from excessively squeezing the side wall of the pole hole 301 in the width direction, and cause the width of the cover plate body 3 to exceed the tolerance, ensure the consistency of the width of the cover plate body 3 after riveting, and avoid problems such as difficulty in assembling the shell cover and poor welding; and by limiting the size n of the unilateral avoidance space 201 in the width direction to the first column portion 210, the width of the first column portion 210 is reduced. When the avoidance space 201 is not processed in the portion 210, the maximum dimension D along the width direction satisfies the relationship of 0.05≤2n / D≤0.1, and the recessed dimension of the avoidance space 201 along the width direction is limited to a reasonable range, which can ensure that the avoidance space 201 can provide sufficient space for material expansion, thereby ensuring the consistency of the width of the cover plate body 3 after riveting, and can also avoid the avoidance space 201 being too large in the width direction, which leads to excessive resistance between the surface of the riveted block 4 and the plate body 1, thereby reducing the heat generated during the charging and discharging process, improving the safety of the battery, and ensuring the overcurrent capacity of the pole structure, thereby ensuring the charging and discharging performance of the battery.

[0058] Preferably, the value of 2n / D is 0.08, which can better take into account the reserved material expansion space and resistance and achieve a balance between the two.

[0059] In one embodiment, the first column portion 210 further includes a rectangular region 211 connected between the two arc-shaped regions 212, further combining Figure 4 and Figure 8 As shown, the size of the rectangular area 211 along the width direction is W0, where W0 = D-2n. By adding the rectangular area 211, the cross-sectional area of ​​the first column portion 210 is increased, thereby increasing the current capacity of the pole structure. By setting the width W0 of the rectangular area 211 equal to the difference between the diameter D of the arc-shaped area 212 and the size of the two avoidance spaces 201 along the width direction, it is explained that the avoidance spaces 201 are recessed portions formed on both sides of the width direction of the traditional runway-type pole, thereby ensuring that the avoidance spaces 201 can provide space for material expansion along the width direction when the pole structure is riveted. It can be understood that as an alternative embodiment, the rectangular area 211 can also be omitted (not shown in the figure), and the first column portion 210 can be spliced ​​together by two arc-shaped areas 212. The avoidance spaces 201 are set on both sides of the first column portion 210 along the width direction, which can also achieve the purpose of providing space for material expansion along the width direction.

[0060] In one embodiment, the size of the avoidance space 201 along the height direction is equal to the size of the first column 210 along the height direction, and the avoidance space 201 covers the entire height of the first column 210, thereby ensuring the uniformity of the material expansion of the first column 210 along the height direction, and further preventing the first column 210 from squeezing the cover body 3 due to the riveting expansion. Figure 2 and Figure 6 The arrow in the middle points to the direction of "up and down".

[0061] like Figures 17 to 19 As shown, the first column portion 210 of the conventional pole structure is in a runway shape, wherein the size of the rectangular area along the width direction is equal to the size of the arc-shaped areas on both sides along the width direction, both being the diameter D of the arc-shaped areas. The pole structure of this embodiment is an improvement made on this basis.

[0062] In one embodiment, Figures 1 to 4 As shown, the length of the escape space 201 is equal to the length of the rectangular area 211, that is, all the side surfaces of the rectangular area 211 along the width direction correspond to the escape spaces 201. Each escape space 201 is a straight groove formed on the side surface of one side in the width direction of the first column portion 210. The sidewalls of the escape space 201 are perpendicular to the bottom wall, and the two arc-shaped areas 212 are not affected. The maximum dimension of the first column portion 210 along the width direction is equal to the diameter D of the arc-shaped area 212. The sidewalls of the escape space 201 refer to the sidewalls of the escape space 201 along the length direction, and the bottom wall refers to the outer walls of the first column portion 210 along the width direction.

[0063] In addition, in other embodiments, Figures 5 to 9 As shown, in Figures 1 to 4 On the basis of the pole structure shown, a chamfer 203 is formed on the edge of the arc-shaped area 212 on one side close to the center of the first column portion 210 in the length direction and on the side away from the rectangular area 211 in the width direction, so that the avoidance space 201 is a trumpet-shaped groove opening outward, which is convenient for processing and forming. At this time, since a part of the arc-shaped area 212 is cut off by the chamfer 203, the total size of the arc-shaped area 212 in the width direction is slightly smaller than D, but the impact is not significant.

[0064] In one embodiment, the diameter D of the arcuate region 212 is in the range of 4 mm ≤ D ≤ 30 mm. It should be noted that the terminal structure, as a critical component of the battery, needs to be able to withstand a certain degree of push-pull force without damage, loosening, or poor contact, to ensure the reliability of the battery's electrical connection and mechanical stability during use. If D is less than 4 mm, the first column portion 210 is too small and the structural strength is weak, making it difficult to meet the minimum push-pull force requirements. If D is greater than 30 mm, the first column portion 210 is too large, and the terminal structure is too heavy, which is not conducive to achieving lightweight battery cells. Therefore, by limiting the diameter D of the arcuate region 212 to a value within the range of 4 mm to 30 mm, it is possible to ensure that the terminal structure can meet the minimum push-pull force requirements, thereby ensuring the reliability of the terminal structure and the performance and safety of the battery, while also preventing the terminal structure from being too large and heavy, thereby facilitating lightweight battery cells.

[0065] In one embodiment, the range of the recess depth n of each avoidance space 201 along the width direction is: 0.05mm≤n≤1.5mm. It should be noted that the pole structure is generally formed by cold heading of wire rods, and a cold heading die is used during the forming process. If n is less than 0.05mm, it is difficult to meet the minimum cold heading die precision requirement, and the size of the avoidance space 201 along the width direction is too small. The space for expansion provided by the avoidance space 201 is insufficient, resulting in the first column 210 squeezing the cover body 3 along the width direction, causing poor width consistency of the cover body 3; if n is greater than 1.5mm, the size of the avoidance space 201 along the width direction will be redundant, and the expansion of the first column 210 after riveting will not be able to fill the avoidance space 201, affecting the conductive performance and structural strength. Therefore, by setting the recess depth n of each avoidance space 201 along the width direction to a value within the range of 0.05mm to 1.5mm, it is possible to meet the minimum cold heading die accuracy requirements, ensure that the avoidance space 201 can provide sufficient material expansion space, and ensure the conductive performance and structural strength of the pole structure.

[0066] In one embodiment, the second column 220 is runway-shaped, and the circumferential dimension of the first column 210 is larger than the circumferential dimension of the second column 220. The outer contour of the orthographic projection of the second column 220 on the first column 210 in the vertical direction and the outer contour of the upper surface of the first column 210 form a first ring portion 202, further combined with Figures 3 and 4 and Figures 7 and 8 As shown, the ring width of the first ring portion 202 is K, wherein K and n satisfy the relationship: 0.3≤n / K≤0.8, and the units of n and K are both mm. Figure 2 and Figure 6The surface in the direction of "up" indicated by the middle arrow; the plate 1, the first column 210, and the second column 220 are fixedly connected in order from bottom to top, wherein the bottom refers to Figure 2 and Figure 6 The middle arrow points to the direction of "down"; the circumferential dimension refers to the dimension of the area enclosed by the outer peripheral contour line.

[0067] It should be noted that the first column portion 210 is also runway-shaped, and the first column portion 210 and the second column portion 220 are coaxially arranged. The portion of the first column portion 210 that is larger than the second column portion 220 in the circumferential direction forms a support platform for supporting the riveting block 4; the first ring portion 202 includes a portion corresponding to the arc area 212 and a portion corresponding to the rectangular area 211. Since the portion corresponding to the rectangular area 211 is affected by the avoidance space 201, the ring width of the portion of the first ring portion 202 corresponding to the rectangular area 211 is smaller than the ring width of the portion corresponding to the arc area 212. The ring width dimension K of the first ring portion 202 refers to the ring width of the portion of the first ring portion 202 corresponding to the arc area 212. If n / K is less than 0.3, the proportion of the avoidance space 201 on the support platform is too small, making processing and manufacturing difficult. If n / K is greater than 0.8, the proportion of the avoidance space 201 on the support platform is too large, the support platform area caused by the avoidance space 201 is reduced too much, and the area of ​​the support platform corresponding to the rectangular area 211 is too small, resulting in insufficient support for the riveted block 4, causing the riveted block 4 to bend under pressure and the flatness not meeting the requirements. Therefore, by setting n / K to a value between 0.3 and 0.8, the avoidance space 201 can be reduced to reduce the difficulty of processing and manufacturing, ensuring the smooth formation of the pole structure, and ensuring that the first column portion 210 can provide sufficient support for the riveted block 4, preventing the riveted block 4 from bending and deforming when under pressure, thereby ensuring the flatness of the riveted block 4 and improving the qualified rate of the battery.

[0068] In one embodiment, the ring width K of the first ring portion 202 is within the range of 0.4 mm ≤ K ≤ 2.5 mm. If K is less than 0.4 mm, the width of the first column portion 210 used to support the rivet block 4 is too small, and the rivet pressure may damage the contact surface between the rivet block 4 and the first column portion 210. At the same time, n < K is required to ensure the manufacturability of the pole body. If K is greater than 2.5 mm, the first column portion 210 is too large in length and width compared to the second column portion 220, resulting in excessive weight and waste of material. Therefore, by limiting the ring width K of the first ring portion 202 to a value within the range of 0.4 mm to 2.5 mm, it is possible to ensure that the first column portion 210 has sufficient support area for the rivet block 4, provide sufficient support for the rivet block 4, avoid riveting pressure and damage the fitting surface between the rivet block 4 and the first column portion 210, thereby improving the qualified rate of the battery, and avoid the first column portion 210 being too heavy and wasting materials.

[0069] In one embodiment, the length of the plate body 1 is L1, and the maximum length of the first column portion 210 is L0, where 0.25≤L0 / L1≤0.75, and the units of L0 and L1 are both mm. It should be noted that the maximum length of the first column portion 210 refers to the distance between the intersection of a straight line parallel to the length and passing through the centers of the two arc-shaped regions 212 and the outer circumferential surfaces of the two arc-shaped regions 212; if the circumferential dimension of the first column portion 210 is greater than the circumferential dimension of the second column portion 220, then the maximum length dimension L0 of the first column portion 210 is the maximum length dimension of the pole structure. If L0 / L1 is less than 0.25, it means that the ratio of the total length of the plate body 1 to the length of the pole structure is too large, the size of the pole structure is too small, and it is difficult to form. In addition, the excessive length of the plate body 1 may cause bending deformation. The plate body 1 is used to compress the third ring portion 502 of the sealing ring 5. If L0 / L1 is greater than 0.75, the length of the first column portion 210 is too large relative to the length of the plate body 1. The excess size of the plate body 1 on both sides along the length direction is too small compared to the first column portion 210, which will result in insufficient compression surface of the third ring portion 502 of the sealing ring 5 on both sides along the width direction, making it difficult to ensure the sealing performance of the sealing ring 5, resulting in electrolyte leakage.

[0070] Therefore, by setting L0 / L1 to a value between 0.25 and 0.75, it can be ensured that the pole structure can be smoothly formed and the plate body 1 can be prevented from being bent and deformed due to being too long, and the compression ability of the plate body 1 on the sealing ring 5 can be ensured, thereby ensuring the sealing performance, avoiding electrolyte leakage, and improving the safety of the battery.

[0071] In one embodiment, the length dimension L1 of the plate 1 is in the range of 6 mm ≤ L1 ≤ 45 mm. It should be noted that the plate 1 is also used for welding to the tabs on the electrode assembly inside the battery. If L1 is less than 6 mm, the length of the plate 1 is too small to meet the requirements for welding the plate 1 to the tabs. If L1 is greater than 45 mm, the length of the plate 1 is too long, making it prone to bending and deformation, resulting in poor flatness. Therefore, by limiting the length of the plate 1 to between 6 mm and 45 mm, the plate 1 is ensured to have sufficient length to meet the length requirements for welding to the tabs, ensuring the weld area and quality between the plate 1 and the tabs. It also prevents bending and deformation of the plate 1 due to excessive length, reduces the risk of poor flatness of the plate 1, and further ensures the compression performance of the plate 1 on the sealing ring 5, the welding quality between the plate 1 and the tabs, and the qualified rate of the battery.

[0072] In one embodiment, the maximum dimension L0 of the first column portion 210 along the length direction has a value range of: 4mm<L0≤45mm. If L0 is less than or equal to 4mm, the length dimension of the first column portion 210 is too small, the structural strength is insufficient, and it is difficult to meet the minimum tensile force requirements of the pole structure; if L0 is greater than 45mm, the length dimension of the first column portion 210 is too large, resulting in excessive weight and waste of materials. Therefore, by limiting the length dimension of the first column portion 210 to a value within the range of 4mm to 45mm, it can be ensured that the pole structure can meet the minimum tensile force requirements of the pole structure, thereby ensuring the reliability of the pole structure and ensuring the electrical connection reliability and mechanical stability of the battery during use, and it can also avoid the excessive weight of the pole structure and avoid waste of materials.

[0073] In one embodiment, the dimension of the plate body 1 along the width direction is W1, wherein W1 and D satisfy the relationship: 0.3≤D / W1≤0.7. It should be noted that the pole structure is generally formed by cold heading of wire rod. If D / W1 is less than 0.3, the dimension of the first column portion 210 along the width direction is too small, and the width dimension of the wire rod used for processing is small, which will cause the plate body 1 to be short of material and insufficiently formed. If D / W1 is greater than 0.7, it means that the width of the first column portion 210 accounts for too much of the width of the plate body 1, that is, the excess dimension of the plate body 1 on both sides of the width direction is too small compared to the pole structure, which will cause the plate body 1 to be insufficiently compressed on the sealing ring along the width direction, resulting in poor sealing. Therefore, by limiting D / W1 to a value between 0.3 and 0.7, it is possible to ensure that the pole structure is smoothly formed and that the plate body 1 compresses the sealing ring 5 on both sides of the width direction, thereby ensuring sealing performance.

[0074] The following measurements were made of the width W3 of the cover plate body 3 and the resistance R between the surface of the riveted block 4 and the plate body 1 of different cover plate assemblies after riveting the pole structure. The measurement results for the embodiment and comparative example are shown in Tables 1 to 3. For the cover plate assembly of the embodiment, the relationship between the recessed depth n of each avoidance space 201 along the width direction and the diameter D of the arc-shaped area 212 satisfies the relationship of 0.05 ≤ 2n / D ≤ 0.1 of this embodiment; for the cover plate assembly of the comparative example, the relationship between n and D does not satisfy the relationship of 0.05 ≤ 2n / D ≤ 0.1. W3 refers to the total width dimension of the cover plate body 3 at the location corresponding to the pole hole 301.

[0075] Table 1 shows a cover assembly with a diameter D of 5 mm in the arc area 212 and a cover body width W3 of (15±0.05) mm. The resistance R requirement between the surface of the riveting block 4 and the plate body 1 is: R≤0.035 mΩ. The values ​​of the dimensions n of different unilateral avoidance spaces 201 along the width direction are listed, and the width W3 of the cover body 3 after riveting and the resistance R between the surface of the riveting block 4 and the plate body 1 are compared.

[0076] Table 1

[0077] n(mm) D(mm) 2n / D W3(mm) R(mΩ) Example 1-1 0.125 5 0.050 15.05 0.0246 Example 1-2 0.13 5 0.052 15.046 0.027 Examples 1-3 0.155 5 0.062 15.041 0.0294 Examples 1-4 0.17 5 0.068 15.036 0.0316 Examples 1-5 0.2 5 0.080 15.029 0.033 Examples 1-6 0.249 5 0.100 15.021 0.035 Comparative Example 1-1 0.1 5 0.040 15.062 0.019 Comparative Example 1-2 0.115 5 0.046 15.055 0.021 Comparative Examples 1-3 0.28 5 0.112 15.014 0.037 Comparative Examples 1-4 0.3 5 0.120 15.004 0.041

[0078] Table 2 shows a cover assembly with a diameter D of 6.5 mm in the arc-shaped area 212 and a cover body width W3 of (17±0.05) mm. The resistance R requirement between the surface of the riveting block 4 and the plate body 1 is: R≤0.035 mΩ. The values ​​of the dimensions n of different unilateral avoidance spaces 201 along the width direction are listed, and the width W3 of the cover body 3 after riveting and the resistance R between the surface of the riveting block 4 and the plate body 1 are compared.

[0079] Table 2

[0080] n(mm) D(mm) 2n / D W3(mm) R(mΩ) Example 2-1 0.164 6.5 0.050 17.05 0.024 Example 2-2 0.175 6.5 0.054 17.045 0.027 Example 2-3 0.19 6.5 0.058 17.04 0.03 Examples 2-4 0.22 6.5 0.068 17.034 0.032 Examples 2-5 0.3 6.5 0.092 17.027 0.0337 Examples 2-6 0.325 6.5 0.100 17.017 0.035 Comparative Example 2-1 0.11 6.5 0.034 17.065 0.017 Comparative Example 2-2 0.13 6.5 0.040 17.054 0.02 Comparative Examples 2-3 0.36 6.5 0.111 17.01 0.037 Comparative Examples 2-4 0.4 6.5 0.123 17.003 0.0387

[0081] Table 3 shows a cover assembly with a diameter D of 7.5 mm in the arc area 212 and a cover body width W3 of (17.7±0.05) mm. The resistance R requirement between the surface of the riveting block 4 and the plate body 1 is: R≤0.035 mΩ. Different values ​​of the dimension n of the unilateral avoidance space 201 along the width direction are listed, and the width W3 of the cover body 3 after riveting and the resistance R between the surface of the riveting block 4 and the plate body 1 are compared.

[0082] Table 3

[0083] n(mm) D(mm) 2n / D W3(mm) R(mΩ) Example 3-1 0.186 7.5 0.050 17.75 0.0223 Example 3-2 0.2 7.5 0.053 17.742 0.0261 Example 3-3 0.25 7.5 0.067 17.737 0.0286 Examples 3-4 0.258 7.5 0.069 17.732 0.0303 Examples 3-5 0.345 7.5 0.092 17.728 0.0324 Examples 3-6 0.375 7.5 0.100 17.713 0.035 Comparative Example 3-1 0.155 7.5 0.041 17.762 0.0185 Comparative Example 3-2 0.175 7.5 0.047 17.759 0.0205 Comparative Example 3-3 0.398 7.5 0.106 17.707 0.037 Comparative Examples 3-4 0.45 7.5 0.120 17.698 0.0381

[0084] As can be seen from Table 1, in Examples 1-1 to 1-6, 2n / D is within the range of 0.05 to 0.1 as defined in this application. The width of the cover plate body after riveting, W3, is 15±0.05 mm, and the resistance R is less than or equal to 0.035 mΩ. That is, the width of the cover plate body after riveting and the resistance between the surface of the riveted block and the plate body meet the requirements. The width of the cover plate body 3 after riveting does not exceed the tolerance, the width consistency of the cover plate body 3 is good, and the resistance between the surface of the riveted block and the plate body is small. In Comparative Examples 1-1 to 1-2, 2n / D is less than 0. 05, which is not within the scope defined in the present application. Although the resistance R is less than or equal to 0.035mΩ, the width W3 of the cover body after riveting is greater than 15.05mm (i.e., 15+0.05mm), the width of the cover body 3 is out of tolerance, and the width consistency is poor. In comparative examples 1-3 to 1-4, 2n / D is greater than 0.1, which is not within the scope defined in the present application. Although the width W3 of the cover body after riveting meets the requirement of 15±0.05mm, the resistance R is greater than 0.035mΩ, and the resistance between the surface of the riveted block and the plate body is too large, which does not meet the requirements.

[0085] As can be seen from Table 2, in Examples 2-1 to 2-6, 2n / D is within the range of 0.05 to 0.1 specified in this application, the width of the cover body after riveting W3 = 17 ± 0.05 mm, and the resistance R is less than or equal to 0.035 mΩ, that is, the width of the cover body after riveting and the resistance between the surface of the riveted block and the plate body meet the requirements, the width consistency of the cover body 3 after riveting is good, and the resistance between the surface of the riveted block and the plate body is small; while in Comparative Examples 2-1 to 2-2, 2n / D is less than 0.05, and is not Within the scope defined in this application, although the resistance R is less than or equal to 0.035mΩ, the width W3 of the cover body after riveting is greater than 17.05mm (i.e., 15+0.05mm), the width of the cover body 3 is out of tolerance, and the width consistency is poor; in comparative examples 2-3 to 2-4, 2n / D is greater than 0.1, which is not within the scope defined in this application. Although the width W3 of the cover body after riveting meets the requirement of 17±0.05mm, the resistance R is greater than 0.035mΩ, and the resistance between the surface of the riveted block and the plate body is too large, which does not meet the requirements.

[0086] As can be seen from Table 3, in Examples 3-1 to 3-6, 2n / D is within the range of 0.05 to 0.1 specified in this application, the width of the cover body after riveting W3 = 17.7 ± 0.05 mm, and the resistance R is less than or equal to 0.035 mΩ, that is, the width of the cover body after riveting and the resistance between the surface of the riveted block and the plate body meet the requirements, the width consistency of the cover body 3 after riveting is good, and the resistance between the surface of the riveted block and the plate body is small; while in Comparative Examples 3-1 to 3-2, 2n / D is less than 0.05, which is not in this application. Within the range specified in the application, although the resistance R is less than or equal to 0.035mΩ, the width W3 of the cover body after riveting is greater than 17.75mm (i.e. 17.7+0.05mm), the width of the cover body 3 is out of tolerance, and the width consistency is poor; in comparative examples 3-3 to 3-4, 2n / D is greater than 0.1, which is not within the range specified in this application. Although the width W3 of the cover body after riveting meets the requirement of 17.7±0.05mm, the resistance R is greater than 0.035mΩ, and the resistance between the surface of the riveted block and the plate body is too large, which does not meet the requirements.

[0087] In summary, when 2n / D satisfies the relationship of 0.05≤2n / D≤0.1, the cover plate body width and the resistance between the riveted block surface and the plate body of the riveted cover plate assembly can meet the requirements at the same time, and the cover plate assembly has good performance.

[0088] The following evaluation of the manufacturability of the pole structure and its impact on the flatness of the rivet block 4 was conducted for cover plate assemblies with different values ​​of n / K. The evaluation results for the embodiment and comparative example are shown in Tables 4 to 6. In the embodiment, the depth n of the recess along the width of each avoidance space 201 and the width K of the first ring portion 202 satisfy the relationship of 0.3 ≤ n / K ≤ 0.8. In the comparative example, n and K do not satisfy this relationship. It should be noted that the width K of the first ring portion 202 represents the width of support provided by the pole structure to the rivet block 4.

[0089] Table 4 shows the cover assembly with different values ​​of the ring width K of the first ring portion 202 and the width n of the single-side avoidance space 201, and evaluates the manufacturability of the pole structure and its impact on the flatness of the riveted block (≤0.25 mm).

[0090] Table 4

[0091]

[0092]

[0093] Table 5 shows the cover assembly with different values ​​of the ring width K of the first ring portion 202 and the width n of the single-side avoidance space 201, and evaluates the manufacturability of the pole structure and its impact on the flatness of the riveted block (≤0.25 mm).

[0094] Table 5

[0095] n(mm) K(mm) n / K Pole manufacturability Riveting block flatness (mm) Example 5-1 0.114 0.45 0.253 yes 0.135 Example 5-2 0.155 0.45 0.344 yes 0.155 Example 5-3 0.24 0.45 0.533 yes 0.178 Example 5-4 0.275 0.45 0.611 yes 0.21 Example 5-5 0.33 0.45 0.733 yes 0.235 Examples 5-6 0.36 0.45 0.800 yes 0.25 Comparative Example 5-1 0.075 0.45 0.167 no 0.089 Comparative Example 5-2 0.098 0.45 0.218 no 0.13 Comparative Example 5-3 0.4 0.45 0.889 yes 0.255 Comparative Example 5-4 0.42 0.45 0.933 yes 0.295

[0096] Table 6 shows the cover assembly with different values ​​of the ring width K of the first ring portion 202 and the width dimension n of the single-side avoidance space 201, and evaluates the manufacturability of the pole structure and its impact on the flatness of the riveted block (≤0.25 mm).

[0097] Table 6

[0098] n(mm) K(mm) n / K Pole manufacturability Riveting block flatness (mm) Example 6-1 0.165 0.55 0.300 yes 0.123 Example 6-2 0.18 0.55 0.327 yes 0.135 Example 6-3 0.22 0.55 0.400 yes 0.144 Example 6-4 0.265 0.55 0.482 yes 0.165 Example 6-5 0.4 0.55 0.727 yes 0.223 Example 6-6 0.44 0.55 0.800 yes 0.25 Comparative Example 6-1 0.12 0.55 0.218 no 0.085 Comparative Example 6-2 0.145 0.55 0.264 no 0.112 Comparative Example 6-3 0.49 0.55 0.891 yes 0.26 Comparative Example 6-4 0.5 0.55 0.909 yes 0.31

[0099] In Tables 4 to 6, the value range of K is within the range defined in this application. It can be seen from Tables 4 to 6 that in Examples 4-1 to 4-6, 5-1 to 5-6, and 6-1 to 6-6, the values ​​of n / K are all within the range of 0.3 to 0.8 defined in this application, the pole structures all meet the manufacturability, and the flatness of the rivet blocks is less than 0.25 mm, which meets the riveting flatness requirement; while in Comparative Examples 4-1 to 4-2, 5-1 to 5-2, and 6-1 to 6-2, n / K is less than 0.3, which is not within the range defined in this application, and the pole structure does not meet the manufacturability; in Comparative Examples 4-3 to 4-4, 5-3 to 5-4, and 6-3 to 6-4, n / K is greater than 0.8, which is not within the range defined in this application. Although the pole structures all meet the manufacturability, the flatness of the rivet blocks is greater than 0.25 mm, which does not meet the riveting flatness requirement.

[0100] In summary, when n and K satisfy the relationship of 0.3≤n / K≤0.8, the pole structure meets the manufacturability requirements, and the riveting block 4 meets the riveting flatness requirements, and the cover plate assembly has good performance.

[0101] According to an embodiment of the present invention, on the other hand, a cover plate assembly is provided. Figures 10 to 16 As shown, the cover plate assembly includes: a cover plate body 3, a rivet block 4, the aforementioned pole structure, and a sealing ring 5. The cover plate body 3 defines a pole hole 301; the rivet block 4 is disposed on one side of the cover plate body 3 and defines a rivet hole 401 corresponding to the pole hole 301; the plate body 1 of the pole structure is located on the side of the cover plate body 3 facing away from the rivet block 4, the first pole portion 210 is disposed in the pole hole 301, and the second pole portion 220 is disposed in the rivet hole 401; the sealing ring 5 is disposed between the first pole portion 210 and the pole hole 301.

[0102] It should be noted that the rivet hole 401 includes a first hole segment 402, a second hole segment 403 and a third hole segment 404 connected in sequence from bottom to top. The opening area of ​​the first hole segment 402 is smaller than the opening area of ​​the second hole segment 403, and the opening area of ​​the second hole segment 403 is smaller than the opening area of ​​the third hole segment 404. Figures 11 to 12As shown, before riveting, the size of the second column portion 220 in the up-down direction is equal to the sum of the sizes of the first hole segment 402 and the second hole segment 403 in the up-down direction, the upper surface of the second column portion 220 is flush with the upper end surface of the second hole segment 403, the circumferential size of the second hole segment 403 is larger than the circumferential size of the second column portion 220, and a gap is formed between the inner wall of the second hole segment 403 and the outer circumferential wall of the second column portion 220, which is a material expansion space. After the pole structure is riveted to the cover body, the portion of the second column portion 220 corresponding to the second hole segment 403 expands outward to fill the expansion space, and the pole structure after riveting is formed as shown in FIG. Figure 19 The shape in the middle realizes the riveting between the pole structure, the riveting block 4 and the cover body 3. At the same time, the avoidance space 201 on the first column portion 210 can prevent the first column portion 210 from being compressed and expanding and excessively squeezing the cover body 3 along the width direction. Figure 12 The arrow in the middle points to the direction of "up and down".

[0103] Compared with the traditional cover plate structure, the cover plate assembly of this embodiment can improve the deformation problem caused by riveting the pole structure at the position where the cover plate body 3 corresponds to the pole structure, thereby improving the yield rate of the cover plate.

[0104] In one embodiment, the pole hole 301 is in a racetrack shape, and the size of the pole hole 301 along the width direction is W2 (eg Figure 14 As shown), the sealing ring 5 includes a second ring portion 501, the second ring portion 501 is located between the outer peripheral side of the first column portion 210 and the pole hole 301, and the ring width of the second ring portion 501 is M (as shown Figure 16 As shown), where W2, M and D satisfy the relationship: It should be noted that the second ring portion 501 is located between the first column portion 210 and the cover body 3. The cover body 3, the sealing ring 5 and the pole structure each have dimensional tolerances. There are assembly tolerances during the assembly process. The above formula The range is composed of the cumulative assembly tolerance and dimensional tolerance, specifically the positioning deviation between the riveting process pole structure and the cover body 3, as well as the dimensional tolerances of the pole hole 301, the thickness M of the second ring portion 501 of the sealing ring 5, and the maximum width of the first column portion 210. A value between 0.15 mm and 0.6 mm can ensure smooth assembly of the cover body 3, the sealing ring 5 and the terminal structure, and ensure the stability and sealing of the assembled structure, thereby improving the reliability of the battery.

[0105] It should be noted that the pole hole 301 includes a fourth hole segment 3011 and a fifth hole segment 3012 connected to each other. The opening area of ​​the fourth hole segment 3011 is smaller. A support platform is formed on the end of the fifth hole segment 3012 close to the fourth hole segment 3011, which is used to cooperate with the convex ring on the lower side of the first plastic part 6. The dimension of the pole hole 301 along the width direction refers to the dimension of the fourth hole segment 3011 along the width direction.

[0106] In one embodiment, the sealing ring 5 further includes a third ring portion 502 , which is connected to an end of the second ring portion 501 close to the plate body 1 . The third ring portion 502 is compressed between the cover body 3 and the plate body 1 to further improve the sealing performance.

[0107] In one embodiment, the cover assembly further includes: a first plastic part 6 and a second plastic part 7, the first plastic part 6 being arranged between the rivet block 4 and the cover body 3 to ensure insulation between the rivet block 4 and the cover body 3, the first plastic part 6 being provided with a first through hole 601 corresponding to the pole hole 301, the first through hole 601 being provided for a portion of the first column portion 210 close to the second column portion 220 to pass through; the second plastic part 7 being arranged on a side of the cover body 3 away from the first plastic part 6, the second plastic part 7 being provided with a second through hole 701, a partial section of the first column portion 210 close to the plate body 1 being passed through the second through hole 701, the plate body 1 being located on a side of the second plastic part 7 away from the cover body 3, the plate body 1 pressing the second plastic part 7 toward the cover body 3, the second plastic part 7 being used to ensure insulation between the cover body 3 and the pole group.

[0108] In one embodiment, the first plastic part 6 is an upper plastic and the second plastic part 7 is a lower plastic.

[0109] In one embodiment, the cover assembly further includes an explosion-proof valve 8. An explosion-proof valve hole 302 is further provided on the cover body 3. The explosion-proof valve 8 is disposed in the explosion-proof valve hole 302. The explosion-proof valve 8 is adapted to open when the air pressure inside the battery reaches a preset value, thereby discharging high-temperature flue gas in the battery in a timely manner to prevent the battery from exploding. An explosion-proof patch 801 is affixed to the explosion-proof valve 8 to protect the explosion-proof valve.

[0110] According to another aspect of an embodiment of the present invention, a battery is provided, comprising: a housing, an electrode group, and the aforementioned cover plate assembly. The housing has an open end; the electrode group is disposed within the housing; and the cover plate assembly covers the open end of the housing. Preferably, the battery is a lithium battery, and is used in fields such as electric vehicles and energy storage.

[0111] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A pole structure, characterized in that: include: plate body; The column comprises a first column portion and a second column portion, wherein the first column portion is fixedly connected between the plate body and the second column portion, and the first column portion is adapted to be inserted into the pole hole on the cover body; The first column portion includes at least two arc-shaped areas arranged opposite to each other along the length direction, and the diameter of the arc-shaped areas is D; avoidance spaces are formed on both sides of the first column portion along the width direction, and the avoidance spaces are formed by a partial area of ​​the outer peripheral surface of the first column portion being recessed along the width direction. The recess depth of each avoidance space along the width direction is n, wherein 0.05≤2n / D≤0.

1.

2. The pole structure according to claim 1, characterized in that: The first column portion further includes a rectangular area connected between the two arc-shaped areas. The size of the rectangular area along the width direction is W0, where W0=D-2n.

3. The pole structure according to claim 1, characterized in that: The diameter D of the arc-shaped area has a value range of: 4 mm ≤ D ≤ 30 mm; And / or, the range of the recessed depth n of each of the avoidance spaces along the width direction is: 0.05 mm ≤ n ≤ 1.5 mm.

4. The pole structure according to claim 1, characterized in that: The second column portion is runway-shaped, and the circumferential dimension of the first column portion is larger than the circumferential dimension of the second column portion. A first ring portion is formed between the outer contour of the positive projection of the second column portion on the first column portion in the up and down directions and the outer contour of the upper surface of the first column portion. The ring width of the first ring portion is K, wherein the relationship between K and n satisfies the following equation: 0.3≤n / K≤0.

8.

5. The pole structure according to claim 4, characterized in that: The ring width dimension K of the first ring portion has a value range of: 0.4 mm ≤ K ≤ 2.5 mm.

6. The pole structure according to any one of claims 1 to 5, characterized in that: The length of the plate is L1, and the maximum length of the first column is L0, wherein 0.25≤L0 / L1≤0.75; And / or, the dimension of the plate along the width direction is W1, wherein W1 and D satisfy the relationship: 0.3≤D / W1≤0.

7.

7. The pole structure according to claim 6, characterized in that: The length L1 of the plate is in the range of 6 mm ≤ L1 ≤ 45 mm. And / or, the maximum dimension L0 of the first column portion along the length direction has a value range of: 4mm<L0≤45mm.

8. A cover plate assembly, characterized in that: include: The cover body is provided with a pole hole; A rivet block is provided on one side of the cover body, and a rivet hole corresponding to the pole hole is opened on the rivet block; The pole structure according to any one of claims 1 to 7, wherein the plate body of the pole structure is located on a side of the cover body away from the rivet block, the first column portion is inserted into the pole hole, and the second column portion is inserted into the rivet hole; A sealing ring is provided between the first column portion and the pole hole.

9. The cover plate assembly according to claim 8, wherein: The pole hole is in a racetrack shape, and the size of the pole hole in the width direction is W2. The sealing ring includes a second ring portion, which is located between the outer circumference of the first column portion and the pole hole. The ring width of the second ring portion is M, wherein W2, M and D satisfy the relationship:

10. A battery, characterized in that: include: a housing having an open end; a pole group, disposed in the housing; The cover plate assembly according to any one of claims 8 to 9, wherein the cover plate assembly is covered on the open end of the shell.

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