Battery cell cover plate and battery cell

Abstract

A battery cell cover plate and a battery cell, relating to the field of battery cell structures. The battery cell cover plate comprises: a plate assembly provided with mounting holes (201); and terminals (1), a position-limiting portion (13) being formed on an outer side portion of each terminal (1), wherein when the terminals (1) are correspondingly disposed at the mounting holes (201), the plate assembly is located between the position-limiting portions (13), and the plate assembly is pressed against the terminals (1) so as to seal the mounting holes (201). The battery cell cover plate can meet cell assembly requirements without the need to provide a riveting block, so that the overall structure of the battery cell cover plate is effectively reduced, thereby effectively reducing the occupied space, weight, and production cost of the battery cell cover plate. In addition, the internal resistance of the battery cell can be effectively reduced to lower the overcurrent temperature rise of the battery cell, thereby ensuring the safety performance of the battery cell when in use.

Description

Battery cover and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202322664856.6, entitled “A battery cell cover and battery cell”, filed with the Patent Office of China on September 28, 2023, and priority to the Chinese patent application with application number CN202322666003.6, entitled “Cover assembly and battery cell”, filed with the Patent Office of China on September 28, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery cell structures, and in particular to a battery cell cover and a battery cell. Background Art

[0004] Existing cell covers utilize a structure where the poles are riveted to a rivet block. This means the rivet block needs to be welded to the module busbar, and the pole base needs to be welded to the cell's connecting tab. This results in both the rivet block and the pole requiring a certain thickness, making the overall cell cover too tall and occupying a large space, which in turn affects the cell's energy density and increases the cell cover's weight and production cost. Furthermore, the current within the cell needs to be transmitted through the rivet block to the weld between it and the pole, resulting in a high internal resistance and a significant overcurrent temperature rise, which in turn affects the cell's performance.

[0005] Application Contents

[0006] In view of this, the purpose of this application is to provide a battery cell cover and a battery cell to solve the problems of the existing battery cell cover, which is too high in overall height, occupies a large space, has a large internal resistance of the battery cell, and has a large overcurrent temperature rise due to the structure of connecting the pole and the rivet block.

[0007] In a first aspect, the present application provides a battery cell cover, comprising:

[0008] A plate assembly having mounting holes; and

[0009] The pole has a limiting portion formed on its outer side; when the pole is correspondingly arranged at the mounting hole, the plate assembly is located between the limiting portions, and the limiting portion is pressed against the pole to seal the mounting hole.

[0010] Beneficial effects: The pole column and the plate body assembly are stably connected by pressing; in addition, a limiting part is formed on the outer side of the pole column. When the pole column is arranged at the mounting hole of the corresponding plate body assembly, the plate body assembly can extend to the limiting part of the pole column and be pressed against the pole column, thereby ensuring the sealing performance of the cell cover plate. Thus, compared with the existing cell cover plates, the cell cover plate in this application can meet the assembly requirements of the cell without setting riveting blocks, thereby effectively reducing the overall structure of the cell cover plate, so that the occupied space, weight and production cost are all effectively reduced; in addition, it can also effectively reduce the internal resistance of the cell to reduce its over-current temperature rise, thereby ensuring the safety performance when the cell is in use.

[0011] In an optional implementation manner, the pole column includes a pole column body, a first sub-limiting part and a second sub-limiting part, and the pole column body, the first sub-limiting part and the second sub-limiting part are integrally formed.

[0012] In an optional implementation manner, the pole column body is formed into a columnar structure, and the first sub-limiting part and the second sub-limiting part are respectively arranged around the outer side wall of the pole column body; along the axial direction of the pole column body, the first sub-limiting part and the second sub-limiting part are respectively located at the first end and the second end of the pole column body, so that the axial section of the pole column is formed into a structure similar to a "worker" shape.

[0013] In an optional implementation manner, along the axial direction of the pole column body, the open space surrounded by the second end of the first sub-limiting part, the first end of the second sub-limiting part and the outer side wall of the pole column body forms the limiting part.

[0014] In an optional implementation manner, the plate body assembly includes a top cover, a first insulating part and a sealing ring; the top cover is formed with the mounting hole; when the pole column is arranged at the mounting hole, along the axial direction of the pole column, the first insulating part, the top cover and the sealing part are sequentially pressed on the limiting part.

[0015] In an optional implementation manner, the first insulating part is formed with a groove adapted to the first sub-limiting part; when the pole column is pressed against the plate body assembly, the bottom of the groove abuts against the end face of the second end of the first sub-limiting part, the inner side wall of the groove abuts against the outer side wall of the first sub-limiting part, and along the axial direction of the pole column, the depth of the groove is less than or equal to the thickness of the first sub-limiting part.

[0016] In an optional implementation manner, a first through hole adapted to the pole column body is formed at the center of the bottom of the groove; when the pole column is pressed against the plate body assembly, the inner side wall of the first through hole abuts against the outer side wall of the pole column body.

[0017] In an optional embodiment, the sealing ring is sequentially formed with a small diameter end and a large diameter end; when the pole is pressed against the plate assembly, the inner side wall of the sealing ring abuts against the outer side wall of the pole body; the end face of the large diameter end away from the small diameter end abuts against the end face of the first end of the second sub-limiting portion, and the end face of the large diameter end close to the small diameter end abuts against the end face of the second end of the top cover; the end face of the small diameter end away from the large diameter end abuts against the first insulating member, and the outer side wall of the small diameter end abuts against the inner side wall of the mounting hole.

[0018] In an optional embodiment, the plate assembly further includes a second insulating member, and the second insulating member can fill the gap between the top cover, the sealing ring, and the second sub-limiting portion.

[0019] In an optional embodiment, the plate assembly includes a top cover and an insulating assembly, the insulating assembly includes a first insulating member and a second insulating member, the first insulating member is arranged between the top cover and the first sub-limiting portion, and the second insulating member is arranged between the top cover and the second sub-limiting portion; the top cover is formed with a protrusion extending toward the insulating assembly, and the insulating assembly is formed with a positioning groove for the protrusion to extend into.

[0020] Beneficial effect: By providing a protrusion on the top cover and cooperating with the positioning groove in the insulating assembly, the insulating assembly is prevented from being displaced relative to the top cover, thereby avoiding wear of the insulating assembly, thereby ensuring the insulation performance of the insulating assembly, and further improving the safety of the battery cell and ensuring good performance of the battery cell.

[0021] In an optional embodiment, the protrusion includes a first protrusion provided on the bottom of the top cover;

[0022] A first positioning groove for the first protrusion to extend into is formed on the top of the second insulating member.

[0023] In an optional embodiment, a dimension a of the first protrusion in the first direction is 0 mm < a < 1 mm; and / or a dimension b of the first protrusion in the second direction is 0.2 mm < b < 2 mm.

[0024] In an optional embodiment, in the second direction, the distance c between the first protrusion and the second sub-limiting portion is 0.5 mm < c < 2 mm, and a portion of the second insulating member is embedded between the first protrusion and the second sub-limiting portion.

[0025] In an optional embodiment, in the first direction, the bottom of the first protruding portion extends to below the top of the second sub-limiting portion.

[0026] In an optional embodiment, the first protrusion forms an annular structure arranged around the circumference of the mounting hole, and the first positioning groove is formed as an annular groove;

[0027] Or the first protrusion is formed into a convex block structure, at least one first protrusion is provided, and the first positioning groove is provided in a one-to-one correspondence with the first protrusion;

[0028] When a plurality of the first protruding portions in a convex shape are provided, the plurality of first protruding portions are arranged at intervals in the circumferential direction around the mounting hole.

[0029] In an optional embodiment, the protrusion further includes a second protrusion provided on the top of the top cover, and a second positioning groove for the second protrusion to extend into is formed at the bottom of the first insulating member.

[0030] In an optional embodiment, in the second direction, the first protrusion and the second protrusion are staggered.

[0031] In an optional embodiment, outer edge dimensions of the first sub-limiting portion and the second sub-limiting portion are both larger than inner wall dimensions of the mounting hole.

[0032] In a second aspect, the present application further provides a battery cell comprising the battery cell cover according to any one of claims 1 to 18. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] FIG1 is a schematic diagram of a cell cover according to an embodiment of the present application;

[0035] FIG2 is an exploded view of a cell cover according to an embodiment of the present application;

[0036] FIG3 is a cross-sectional view of a cell cover according to an embodiment of the present application;

[0037] FIG4 is a partially enlarged cross-sectional view of a cell cover according to an embodiment of the present application;

[0038] FIG5 is another partially enlarged cross-sectional view of a cell cover according to an embodiment of the present application;

[0039] FIG6 is a schematic diagram of a first embodiment of a pole according to the present application;

[0040] FIG7 is a schematic diagram of a second embodiment of a pole according to the present application.

[0041] Description of reference numerals:

[0042] 1-pole; 10-pole body; 11-first sub-limiting portion; 12-second sub-limiting portion; 13-limiting portion; 20-top cover; 201-mounting hole; 202-first protrusion; 203-second protrusion; 21-first insulating member; 210-groove; 211-first through hole; 22-second insulating member; 23-sealing ring; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0044] As shown in Figures 1 to 5, according to the first aspect of the present application, a cell cover is provided. The cell cover includes a plate assembly and a pole 1, and the two are stably and tightly connected by pressing. The specific structure of each of the above-mentioned parts of the cell cover according to the present application will be described in detail below.

[0045] In this embodiment, as shown in FIG3 , a limiting portion 13 is formed on the outer side of the pole 1. When the pole 1 is connected to the plate assembly, the plate assembly is located between the limiting portions 13, thereby facilitating the press-fit connection between the plate assembly and the pole 1. Specifically, the pole 1 in this embodiment includes a pole body 10, a first sub-limiting portion 11, and a second sub-limiting portion 12, and the three are integrally formed. The pole body 10 is formed into a columnar structure, and the first sub-limiting portion 11 and the second sub-limiting portion 12 are respectively arranged around the outer side wall of the pole body 10. Furthermore, along the axial direction of the pole body 10, the first sub-limiting portion 11 and the second sub-limiting portion 12 are respectively located at the first end and the second end of the pole body 10, and the end surfaces of the first sub-limiting portion 11 and the second sub-limiting portion 12 that are away from each other are flush with the end surfaces of the first end and the second end of the pole body 10, respectively, so that the axial cross-section of the pole 1 forms a "I"-shaped structure.

[0046] According to the battery cover of the present application, the pole 1 and the plate assembly are stably connected by pressing; in addition, a limiting portion 13 is formed on the outer side of the pole 1. When the pole 1 is set at the mounting hole 201 of the corresponding plate assembly, the plate assembly can extend to the limiting portion 13 of the pole 1 and press with the pole 1, thereby ensuring the sealing of the battery cover, and the first sub-limiting portion 11 and the second sub-limiting portion 12 can limit the axial movement of the plate assembly to improve the stability of the overall structure of the battery cover. In this way, compared with the existing battery cover, the battery cover in the present application does not need to be provided with a rivet block, so that the battery cover can meet the assembly requirements of the battery cell, thereby effectively reducing the overall structure of the battery cover, thereby effectively reducing its occupied space, weight and production cost; in addition, it can also effectively reduce the internal resistance of the battery cell to reduce its overcurrent temperature rise, thereby ensuring the safety performance of the battery cell when in use.

[0047] It should be noted that the specific structures of the first sub-limiting portion 11 and the second sub-limiting portion 12 are not fixed. For example, as shown in Figure 4, the outer contours of the first sub-limiting portion 11 and the second sub-limiting portion 12 can be set to a circle that is compatible with the pole body 10; or, as shown in Figure 5, the outer contour of the second sub-limiting portion 12 can be set to a square.

[0048] Furthermore, along the axis of the pole body 10 , the open space enclosed by the second end of the first sub-limiting portion 11 , the first end of the second sub-limiting portion 12 and the outer wall of the pole body 10 forms the above-mentioned limiting portion 13 .

[0049] In addition, the plate assembly in this cover includes a top cover 20, a first insulating member 21 and a sealing ring 23. The top cover 20 is formed with a mounting hole 201, and the mounting hole 201 is a through-hole structure to facilitate the assembly of the above-mentioned pole 1. When the pole 1 is set at the mounting hole 201, along the axial direction of the pole 1, the first insulating member 21, the top cover 20 and the sealing member are pressed into the above-mentioned limiting portion 13 in sequence to seal the mounting hole 201, so that the pole 1 and the plate assembly can be stably and tightly connected, thereby ensuring the stability and airtightness of the overall structure of the battery cover.

[0050] That is to say, the above-mentioned "plate assembly can extend to the limiting portion 13" actually means that the first insulating member 21, the top cover 20 and the sealing member all have partial structures (or all structures) arranged in the limiting portion 13, that is, the aperture of the mounting hole 201 is larger than the outer diameter of the pole body 10, but the aperture of the mounting hole 201 is smaller than the outer diameter of the first sub-limiting portion 11.

[0051] In this embodiment, the top cover 20 is formed into a long plate-like structure and is made of a plain aluminum plate. The mounting holes 201 are arranged in a one-to-one correspondence with the poles 1 , and there is at least one mounting hole 201 provided on the top cover 20 .

[0052] The outer edge dimensions of the first sub-limiting portion 11 and the second sub-limiting portion 12 are both larger than the inner wall dimensions of the mounting hole 201, thereby eliminating the riveting block components and the assembly process does not require laser welding. At the same time, the height of the pole 1 is reduced, thereby achieving the purpose of reducing the weight and cost of the cover assembly and improving the energy density of the battery cell.

[0053] Specifically, as shown in Figures 1 to 3, a groove 210 is formed at the first end of the first insulating member 21 to mate with the first sub-limiting portion 11. When the pole 1 is pressed into engagement with the plate assembly, the bottom of the groove 210 abuts the end surface of the second end of the first sub-limiting portion 11, and the inner sidewall of the groove 210 abuts the outer sidewall of the first sub-limiting portion 11 (i.e., the outer diameter of the first sub-limiting portion 11 is smaller than the outer diameter of the first insulating member 21). Furthermore, along the axis of the pole 1, the depth of the groove 210 is less than the thickness of the first sub-limiting portion 11. It should be noted that the depth of the groove 210 may also be equal to the thickness of the first sub-limiting portion 11, as long as the stability of the overall structure of the cell cover is ensured.

[0054] Furthermore, a first through-hole 211 is formed at the center of the bottom of the groove 210, which is adapted to fit the main body of the pole 1. When the pole 1 is pressed into the plate assembly, the inner sidewall of the first through-hole 211 abuts against the outer sidewall of the main body of the pole 1. Thus, the first insulating member 21 is sleeved onto the outer sidewall of the main body of the pole 1 through the first through-hole 211 (i.e., part of the first insulating member 21 is located within the retaining portion 13). Furthermore, the first insulating member 21 can surround the first sub-restricting portion 11 of the pole 1 through the inner sidewall of the groove 210, thereby effectively increasing the stability of the connection between the pole 1 and the plate assembly.

[0055] In addition, as shown in Figures 2 to 3, the sealing ring 23 in this embodiment is sequentially formed with a small-diameter end and a large-diameter end; it is sleeved on the outer side wall of the main body of the pole 1 (that is, the sealing ring 23 is entirely located in the limiting portion 13), and when the pole 1 is pressed together with the plate assembly, the inner side wall of the sealing ring 23 abuts against the outer side wall of the main body of the pole 1; the end face of the large-diameter end away from the small-diameter end abuts against the end face of the first end of the second sub-limiting portion 12, and the end face of the large-diameter end close to the small-diameter end abuts against the end face of the second end of the top cover 20; the end face of the small-diameter end away from the large-diameter end abuts against the first insulating member 21, and the outer side wall of the small-diameter end abuts against the inner side wall of the mounting hole 201 of the top cover 20.

[0056] Furthermore, the plate assembly also includes a second insulating member 22, which is arranged on the end face of the second end of the top cover 20 along the axial direction of the pole 1, and the second insulating member 22 is formed into a bent structure adapted to the top cover 20 so as to be able to extend into the limiting portion 13 and fill the gap between the top cover 20, the sealing ring 23 and the second sub-limiting portion 12.

[0057] It should be noted that the pressing of the pole 1 and the plate assembly in the present battery cover means that the pole 1 and the plate assembly are squeezed with a large force to form a stable connection, and the pole 1 and the plate assembly can further increase the stability of the connection between the two through the above-mentioned matching structure to meet the use requirements of the battery. Specifically, when the pole 1 is not assembled with the plate assembly, it is formed into a T-shaped structure as shown in the figure; then the second insulating member 22, the sealing ring 23 and the first insulating member 21 are sequentially sleeved on the outside of the pole 1, and then passed through the mounting hole 201 of the top cover 20 and the positions of the second insulating member 22, the sealing ring 23 and the first insulating member 21 are adjusted, and finally the pole 1 is pressed with the above-mentioned plate assembly by a pressing device, that is, the first sub-limiting portion 11 is naturally formed during the pressing process of the pole 1.

[0058] In a preferred embodiment, the first insulating member 21 is arranged between the top cover 20 and the first sub-limiting portion 11, so that the bottom of the first insulating member 21 fits with the top of the top cover 20, the top of the first insulating member 21 fits with the bottom of the first sub-limiting portion 11, and part of the first insulating member 21 is wrapped around the outer periphery of the first sub-limiting portion 11 and the height of the first insulating member 21 is not higher than the top of the first sub-limiting portion 11; in addition, the second insulating member 22 is arranged between the top cover 20 and the second sub-limiting portion 12, the bottom of part of the second insulating member 22 fits with the top of the second sub-limiting portion 12, and the top of the second insulating member 22 fits with the bottom of the top cover 20, so that the cover assembly and the components are tightly crimped to achieve assembly without the laser welding process.

[0059] The top cover 20 has a protrusion extending toward the insulation assembly, which has a positioning slot into which the protrusion extends. The cooperation between the protrusion and the positioning slot prevents displacement of the insulation assembly relative to the top cover 20, thus preventing wear and tear on the insulation assembly and ensuring its insulation performance. Furthermore, the rivet block component is eliminated, eliminating the need for laser welding, reducing the height of the pole, and reducing the weight and cost of the cover assembly. The pole is a one-piece structure, eliminating the problem of excessive internal resistance.

[0060] In this embodiment, the positioning groove and the protrusion are contour-fitted to ensure that the second insulating member 22 is securely positioned and to avoid loose installation.

[0061] Furthermore, in this embodiment, the protrusion includes a first protrusion 202 arranged at the bottom of the top cover 20, the first protrusion 202 extends downward from the bottom of the top cover 20, and the top of the second insulating member 22 is formed with a first positioning groove for the first protrusion 202 to extend into. The first protrusion 202 is assembled into the first positioning groove, thereby preventing the second insulating member 22 from moving relative to the top cover 20, thereby avoiding wear of the second insulating member 22 and ensuring the insulation performance of the second insulating member 22.

[0062] In this embodiment, as shown in Figure 4, the dimension a of the first protrusion 202 in the first direction D1 is 0mm<a<1mm, and / or the dimension b of the first protrusion 202 in the second direction D2 is 0.2mm<b<2mm, so as to ensure that the first protrusion 202 and the first positioning groove are reliably assembled without affecting the overall structure of the top cover 20, and prevent the first protrusion 202 from slipping out of the first positioning groove.

[0063] In this embodiment, as shown in Figure 4, the distance c between the first protrusion 202 and the second sub-limiting portion 12 is 0.5mm<c<2mm, so that part of the second insulating member 22 is embedded between the first protrusion 202 and the second sub-limiting portion 12, thereby ensuring that part of the second insulating member 22 is provided between the first protrusion 202 and the second sub-limiting portion 12 to achieve an insulating barrier.

[0064] In this embodiment, as shown in FIG4 , in the first direction D1, the bottom of the first protrusion 202 extends below the top of the second sub-limiting portion 12. That is, the distance d between the bottom of the first protrusion 202 and the top of the second sub-limiting portion 12 is greater than 0. This allows a portion of the second insulating member 22 to be sandwiched between the first protrusion 202 and the second sub-limiting portion 12, further limiting the position of the second insulating member 22 and improving the positioning effect of the second insulating member 22. In a preferred embodiment, the distance d between the bottom of the first protrusion 202 and the top of the second sub-limiting portion 12 is 0.5 mm.

[0065] In one embodiment, the first protrusion 202 forms an annular structure circumferentially arranged around the mounting hole 201, and the first positioning groove is formed as an annular groove. Specifically, in this embodiment, the first protrusion 202 is formed as a square ring structure with rounded corners, so as to ensure reliable positioning of the second insulating member 22 while avoiding wear of the second insulating member 22 by the sharp-angle structure, thereby avoiding stress concentration in the mating connection between the first protrusion 202 and the first positioning groove.

[0066] In another embodiment, the first protrusion 202 is formed as a convex block structure, at least one first protrusion 202 is provided, and the first positioning grooves are provided in a one-to-one correspondence with the first protrusions 202. The first protrusions 202 can be formed as rectangular convex block structures as long as they can limit the displacement of the second insulating member 22 relative to the top cover 20. In addition, when multiple first protrusions 202 are provided, the multiple first protrusions 202 are arranged at intervals around the circumference of the mounting hole 201 to ensure uniform force.

[0067] Furthermore, in this embodiment, the protrusion also includes a second protrusion 203 arranged on the top of the top cover 20, and a second positioning groove for the second protrusion 203 to extend into is formed at the bottom of the first insulating member 21, thereby preventing the first insulating member 21 from moving relative to the top cover 20, thereby avoiding wear of the first insulating member 21 and ensuring the insulating performance of the first insulating member 21 in the cover assembly.

[0068] In a preferred embodiment, the first protrusion 202 and the second protrusion 203 are staggered in the second direction D2. That is, the projections of the first protrusion 202 and the second protrusion 203 on a plane perpendicular to the first direction D1 do not overlap. In other words, the distance e between the first protrusion 12 and the second protrusion 203 is greater than 0. This ensures that the force points on both sides of the top cover 20 are at different locations, thereby preventing the top cover 20 from being deformed by force. Specifically, in one embodiment, the first protrusion 202 is disposed on the periphery of the second protrusion 203. In another embodiment, the second protrusion 203 is disposed on the periphery of the first protrusion 202.

[0069] In this embodiment, the structure of the second protrusion 203 may be the same as that of the first protrusion 202 , for example, both are square ring structures with rounded corners.

[0070] In this embodiment, the protrusion is made of the same material as the top cover 20 , and the protrusion and the top cover 20 can be made in an integrally formed manner.

[0071] In addition, the battery cell cover is provided with two poles 1 as described above, which serve as the positive pole 1 and the negative pole 1 of the battery cell respectively. The corresponding bare aluminum sheet is formed with two mounting holes 201, and each pole 1 is respectively provided with a corresponding first insulating member 21, a sealing ring 23 and a second insulating member 22.

[0072] In this embodiment, the first insulating member 21 and the second insulating member 22 are made of plastic.

[0073] Furthermore, the cross-section of the sealing ring 23 is formed into an L-shaped structure, wherein the horizontally arranged portion of the L-shaped structure is located between the top cover 20 and the second insulating member 22, and the vertically arranged portion of the L-shaped structure is located between the side wall of the pole 1 and the inner wall of the mounting hole 201. In this way, the gap between the pole 1, the top cover 20 and the insulating component is filled, thereby ensuring the sealing of the battery cell, avoiding leakage or damage by external moisture, dust, etc., thereby ensuring the normal operation of the battery cell and extending the life of the battery cell.

[0074] According to a second aspect of the present application, a battery cell is provided, comprising the battery cell cover as described above.

[0075] Although the embodiments of the present application 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 application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0076] The pole and plate assembly of the present application are connected stably by pressing; in addition, a limited portion is formed on the outer side of the pole. When the pole is set at the mounting hole of the corresponding plate assembly, the plate assembly can extend to the limited portion of the pole and press with the pole, thereby ensuring the sealing of the battery cover. In this way, compared with the existing battery cover, the battery cover in the present application does not need to be provided with a rivet block, which can make the battery cover meet the assembly requirements of the battery, thereby effectively reducing the overall structure of the battery cover, thereby effectively reducing its occupied space, weight and production cost; in addition, it can also effectively reduce the internal resistance of the battery to reduce its overcurrent temperature rise, thereby ensuring the safety performance of the battery when in use.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: A plate assembly is provided with a mounting hole; and A pole, a limiting portion is formed on the outer side of the pole; when the pole is correspondingly arranged at the mounting hole, the plate assembly is located between the limiting portions, and the limiting portion is pressed together with the pole to seal the mounting hole.

2. The cell cover plate according to claim 1, characterized in that: The pole comprises a pole body, a first sub-limiting portion and a second sub-limiting portion, and the pole body, the first sub-limiting portion and the second sub-limiting portion are integrally formed.

3. The cell cover plate according to claim 2, characterized in that: The pole body is formed into a columnar structure, and the first sub-limiting portion and the second sub-limiting portion are respectively arranged around the outer side wall of the pole body; along the axial direction of the pole body, the first sub-limiting portion and the second sub-limiting portion are respectively located at the first end and the second end of the pole body, so that the axial cross-section of the pole is formed into a "I"-shaped structure.

4. The cell cover plate according to claim 3, characterized in that: Along the axial direction of the pole body, an open space surrounded by the second end of the first sub-limiting portion, the first end of the second sub-limiting portion and the outer side wall of the pole body forms the limiting portion.

5. The cell cover plate according to claim 4, characterized in that: The plate assembly includes a top cover, a first insulating member and a sealing ring; the top cover is formed with the mounting hole; when the pole is arranged at the mounting hole, along the axial direction of the pole, the first insulating member, the top cover and the sealing member are pressed onto the limiting portion in sequence.

6. The cell cover plate according to claim 5, characterized in that: The first insulating member is formed with a groove adapted to the first sub-limiting portion; when the pole is pressed together with the plate assembly, the bottom of the groove abuts against the end face of the second end of the first sub-limiting portion, the inner side wall of the groove abuts against the outer side wall of the first sub-limiting portion, and along the axial direction of the pole, the depth of the groove is less than or equal to the thickness of the first sub-limiting portion.

7. The cell cover plate according to claim 6, characterized in that: A first through hole adapted to the pole body is formed at the center of the bottom of the groove; when the pole is pressed with the plate assembly, the inner side wall of the first through hole abuts against the outer side wall of the pole body.

8. The cell cover plate according to claim 6, characterized in that: The sealing ring is sequentially formed with a small diameter end and a large diameter end; when the pole is pressed against the plate assembly, the inner side wall of the sealing ring abuts against the outer side wall of the pole body; the end face of the large diameter end away from the small diameter end abuts against the end face of the first end of the second sub-limiting portion, and the end face of the large diameter end close to the small diameter end abuts against the end face of the second end of the top cover; the end face of the small diameter end away from the large diameter end abuts against the first insulating member, and the outer side wall of the small diameter end abuts against the inner side wall of the mounting hole.

9. The cell cover plate according to claim 5, characterized in that: The plate assembly further includes a second insulating member, which can fill the gap between the top cover, the sealing ring and the second sub-limiting portion.

10. The cell cover plate according to claim 2, characterized in that: The plate body assembly includes a top cover and an insulating assembly, the insulating assembly includes a first insulating member and a second insulating member, the first insulating member is arranged between the top cover and the first sub-limiting portion, and the second insulating member is arranged between the top cover and the second sub-limiting portion; the top cover is formed with a protrusion extending toward the insulating assembly, and the insulating assembly is formed with a positioning groove for the protrusion to extend into.

11. The cell cover plate according to claim 10, characterized in that: The protrusions include a first protrusion disposed at the bottom of the top cover; A first positioning groove for the first protrusion to extend into is formed on the top of the second insulating member.

12. The cell cover plate according to claim 11, characterized in that: A dimension a of the first protrusion in the first direction is 0 mm<a<1 mm; and / or a dimension b of the first protrusion in the second direction is 0.2 mm<b<2 mm.

13. The cell cover plate according to claim 11, characterized in that: In the second direction, a distance c between the first protruding portion and the second sub-limiting portion is 0.5 mm<c<2 mm, and a portion of the second insulating member is embedded between the first protruding portion and the second sub-limiting portion.

14. The battery cell cover plate according to claim 11, characterized in that: In the first direction, the bottom of the first protruding portion extends to below the top of the second sub-limiting portion.

15. The battery cell cover plate according to claim 11, characterized in that: The first protrusion forms an annular structure arranged around the circumference of the mounting hole, and the first positioning groove is formed as an annular groove; Or the first protrusion is formed as a convex block structure, at least one first protrusion is provided, and the first positioning groove is provided in a one-to-one correspondence with the first protrusion; When a plurality of the first protruding portions in the shape of convex blocks are provided, the plurality of the first protruding portions are arranged at intervals in the circumferential direction around the mounting hole.

16. The battery cell cover plate according to claim 11, characterized in that: The protrusion also includes a second protrusion arranged on the top of the top cover, and a second positioning groove for the second protrusion to extend into is formed at the bottom of the first insulating member.

17. The cell cover plate according to claim 16, characterized in that: In the second direction, the first protrusion and the second protrusion are staggered.

18. The battery cell cover plate according to claim 10, characterized in that: The outer edge dimensions of the first sub-limiting portion and the second sub-limiting portion are both larger than the inner wall dimensions of the mounting hole.

19. A battery cell, characterized in that: The battery cell comprises the battery cell cover plate according to any one of claims 1 to 18.

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