Cover plate structure and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises a top cover sheet, a negative pole assembly, a positive pole assembly and a compression ring, the top cover sheet is provided with a first groove and a second groove which are communicated with each other; the negative pole assembly comprises a negative pole body, and the positive pole assembly comprises a positive pole body; the two pressing rings are arranged on the side, facing a battery cell, of the negative pole column body and the side, facing the battery cell, of the positive pole column body respectively, the projection of the pressing rings in the thickness direction of the top cover piece is at least partially overlapped with the projection of the correspondingly connected positive pole column body or negative pole column body in the thickness direction of the top cover piece, and the pressing rings are fixedly connected with the top cover piece; the two first grooves are respectively arranged corresponding to the positions of the two pressing rings, and the two second grooves are respectively arranged corresponding to the positions of the cathode column body and the anode column body. Therefore, the compression ring can limit the positions of the cathode column body and the anode column body on the top cover plate, the assembly process is simplified, and the internal resistance of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a cover plate structure and battery. BACKGROUND

[0002] A battery is a device that can generate electric current through internal chemical reactions, and is widely used in various occasions from portable electronic devices to large industrial applications.

[0003] The battery comprises a battery cell, a shell and a cover plate, the battery cell is arranged inside the shell, the cover plate is connected with the shell to protect the battery cell, the cover plate is provided with a pole and a conductive block, the pole passes through the conductive block and the cover plate to fix the conductive block on the cover plate, and the conductive block is electrically connected with the battery cell through the pole to connect the battery with external circuit.

[0004] The cover plate made of stainless steel has high strength and high corrosion resistance, in order to facilitate assembly, the pole is usually riveted on the cover plate, and the conductive block is welded with the pole to realize the fixation of the pole and the conductive block, however, due to the small volume of the pole, the overheat capacity is poor after being welded with the conductive block, and the assembly steps of the battery cover plate are more, so that the problems of low assembly efficiency of the battery cover plate and large internal resistance of the battery when being electrically connected with external circuit through the conductive block exist. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a cover plate structure and battery to solve the problems of low assembly efficiency of the battery cover plate and large internal resistance of the battery when being electrically connected with external circuit through the conductive block.

[0006] In order to achieve the purpose, the utility model adopts the following technical scheme:

[0007] In a first aspect, a cover plate structure includes: a top cover sheet having a first slot and a second slot that are in communication with each other, the second slot being arranged on a side of the first slot away from a battery cell, and the first slot and the second slot being arranged one by one in correspondence; a negative pole post assembly including a negative pole post body, the negative pole post body being arranged through the top cover sheet; a positive pole post assembly including a positive pole post body, the positive pole post body being arranged through the top cover sheet; two compression rings, the two compression rings being arranged on a side of the negative pole post body facing the battery cell, and a side of the positive pole post body facing the battery cell, respectively, and a projection of the compression ring in a thickness direction of the top cover sheet at least partially overlapping a projection of the positive pole post body or the negative pole post body connected to the compression ring in the thickness direction of the top cover sheet, the compression ring being fixedly connected to the top cover sheet and used to limit a position of the negative pole post body and the positive pole post body on the top cover sheet; and the first slot and the second slot each having two, the two first slots being arranged in correspondence with positions of the two compression rings, respectively, and the two second slots being arranged in correspondence with positions of the negative pole post body and the positive pole post body, respectively.

[0008] Preferably, an end surface of the negative pole post body away from the battery cell and an end surface of the positive pole post body away from the battery cell are both arranged to protrude from the top cover sheet.

[0009] Preferably, the negative pole post assembly further includes a negative pole post rubber covering a side wall of the negative pole post body, and the positive pole post assembly further includes a positive pole post rubber covering a side wall of the positive pole post body, shapes of the two first slots being adapted to shapes of the negative pole post rubber or the positive pole post rubber connected thereto, respectively.

[0010] Preferably, the negative pole post rubber has a shape different from a shape of the positive pole post rubber, or the negative pole post rubber has a shape similar to a shape of the positive pole post rubber, and a cross-sectional area of the negative pole post rubber is different from a cross-sectional area of the positive pole post rubber.

[0011] Preferably, the negative pole post rubber is fixedly connected with a negative pole anti-twist part, and the positive pole post rubber is fixedly connected with a positive pole anti-twist part.

[0012] Preferably, the negative pole anti-twist part is arranged in an integral manner with the negative pole post rubber, and the positive pole anti-twist part is arranged in an integral manner with the positive pole post rubber.

[0013] Preferably, the negative pole post body is connected with a negative pole protruding part, the negative pole post rubber covers the negative pole protruding part and overlaps the corresponding compression ring, the positive pole post body is connected with a positive pole protruding part, and the positive pole post rubber covers the positive pole protruding part and overlaps the corresponding compression ring.

[0014] As preferred, the negative pole post assembly further comprises a negative sealing ring, which is arranged between the negative pole post body and the compression ring connected therewith, and the positive pole post assembly further comprises a positive sealing ring, which is arranged between the positive pole post body and the compression ring connected therewith.

[0015] As preferred, the cover plate structure further comprises a lower plastic, which is arranged on the side of the top cover sheet facing the battery cell, and the compression ring is arranged between the top cover sheet and the lower plastic.

[0016] In the second aspect, a battery comprises a battery cell, a shell, and the cover plate structure as described above, the top cover sheet is connected with the shell, and the battery cell is arranged in the space enclosed by the top cover sheet and the shell.

[0017] The utility model discloses beneficial effects:

[0018] A cover plate structure comprises a top cover sheet, a negative pole post assembly, a positive pole post assembly and a compression ring, the top cover sheet is provided with a first groove and a second groove in communication with each other, the second groove is arranged on the side of the first groove away from the battery cell, and the first groove and the second groove are arranged one by one in correspondence; the negative pole post assembly comprises a negative pole post body, the negative pole post body is arranged in the top cover sheet, the positive pole post assembly comprises a positive pole post body, and the positive pole post body is arranged in the top cover sheet; the compression ring is provided with two, the two compression rings are arranged on the side of the negative pole post body facing the battery cell and the side of the positive pole post body facing the battery cell respectively, and the projection of the compression ring in the thickness direction of the top cover sheet at least partially overlaps the projection of the positive pole post body or the negative pole post body in the thickness direction of the top cover sheet, the compression ring is fixedly connected with the top cover sheet, and is used for limiting the position of the negative pole post body and the positive pole post body on the top cover sheet; the first groove and the second groove are provided with two, the two first grooves are arranged in correspondence with the positions of the two compression rings respectively, and the two second grooves are arranged in correspondence with the positions of the negative pole post body and the positive pole post body respectively.

[0019] Therefore, since the projection of the compression ring in the thickness direction of the top cover sheet at least partially overlaps the projection of the positive pole post body or the negative pole post body in the thickness direction of the top cover sheet, the compression ring can be fixedly connected with the top cover sheet and overlapped with the positive pole post body or the negative pole post body, so as to limit the positions of the positive pole post body and the negative pole post body on the top cover sheet, improve the assembly efficiency, simplify the assembly process, enable the external circuit and the battery cell to be electrically connected through the positive pole post body and the negative pole post body, and reduce the internal resistance of the battery. ACCURACY

[0020] Figure 1 is the first structure schematic view of the cover plate structure in an embodiment of the utility model;

[0021] Figure 2 is the exploded view of the cover plate structure in an embodiment of the utility model;

[0022] Figure 3 is a first partial sectional view of the cover plate structure in an embodiment of the utility model;

[0023] Figure 4 is a second partial sectional view of the cover plate structure in an embodiment of the utility model;

[0024] Figure 5 is a second structure schematic view of the cover plate structure in an embodiment of the utility model.

[0025] In the drawing:

[0026] 1, top cover sheet; 11, first groove; 12, second groove; 2, negative pole post assembly; 21, negative pole post body; 211, negative pole protruding part; 22, negative pole post rubber coating; 23, negative pole sealing ring; 3, positive pole post assembly; 31, positive pole post body; 311, positive pole protruding part; 32, positive pole post rubber coating; 33, positive pole sealing ring; 4, pressing ring; 5, lower plastic; 6, explosion-proof valve. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all structures.

[0028] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of the present embodiment, the terms "upper", "lower", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0031] Referring to Figure 1 and Figure 2 The utility model provides a cover plate structure, including top cover piece 1, negative pole assembly 2, positive pole assembly 3 and compression ring 4, top cover piece 1 is set with first groove 11 and second groove 12 that communicate with each other, second groove 12 sets up at the side of first groove 11 away from the electric core (not shown in the drawing), and first groove 11 and second groove 12 are set up one by one correspondingly;Negative pole assembly 2 includes negative pole body 21, and negative pole body 21 is threaded in top cover piece 1, and positive pole assembly 3 includes positive pole body 31, and positive pole body 31 is threaded in top cover piece 1.

[0032] In the present embodiment, top cover piece 1 is made of stainless steel material, first groove 11 and second groove 12 are both formed in top cover piece 1 by stamping process, and first groove 11 and second groove 12 both extend in the direction away from the electric core, that is, first groove 11 and second groove 12 both protrude from the side of top cover piece 1 away from the electric core;First groove 11 and second groove 12 are coaxially arranged, the outer diameter of first groove 11 is greater than the outer diameter of second groove 12, and both ends of negative pole body 21 and both ends of positive pole body 31 are located on both sides of top cover piece 1.

[0033] Further, two compression rings 4 are provided, and the two compression rings 4 are respectively arranged on the side of negative pole body 21 facing the electric core and the side of positive pole body 31 facing the electric core, and the projection of compression ring 4 in the thickness direction of top cover piece 1 at least partially overlaps the projection of positive pole body 31 or negative pole body 21 connected thereto in the thickness direction of top cover piece 1, and compression ring 4 is fixedly connected with top cover piece 1, for limiting the position of negative pole body 21 and positive pole body 31 on top cover piece 1;First groove 11 and second groove 12 are both provided with two, two first grooves 11 are respectively arranged corresponding to the positions of two compression rings 4, and two second grooves 12 are respectively arranged corresponding to the positions of negative pole body 21 and positive pole body 31.

[0034] The compression ring 4 is made of stainless steel material, the shape of the first groove 11 is matched with the shape of the compression ring 4, and the compression ring 4 is overlapped with the negative pole body 21 and the positive pole body 31 connected therewith respectively, so that when the negative pole body 21 and the positive pole body 31 are arranged in the corresponding second grooves 12, the one end of the negative pole body 21 and the one end of the positive pole body 31 respectively protrude from the compression ring 4, and the compression ring 4 is welded with the top cover sheet 1, thereby limiting the negative pole body 21 and the positive pole body 31.

[0035] In this way, the compression ring 4 can fix the negative pole body 21 and the positive pole body 31 on the top cover sheet 1, save the riveting process of the negative pole body 21 and the positive pole body 31 and the welding process of the negative pole body 21 and the positive pole body 31 with the corresponding conductive blocks, not only improve the assembly efficiency, but also enable the two ends of the negative pole body 21 and the two ends of the positive pole body 31 to be directly electrically connected with the battery cell and the external circuit respectively, reduce the battery internal resistance, and improve the safety and stability of the battery.

[0036] Referring to Figure 3 and Figure 4 In some embodiments, the end face of the negative pole body 21 away from the battery cell and the end face of the positive pole body 31 away from the battery cell are both protruding from the top cover sheet 1. In this embodiment, the two ends of the negative pole body 21 and the two ends of the positive pole body 31 are both protruding from the top cover sheet 1, so as to facilitate electrical connection with the external circuit or the battery cell.

[0037] In this way, the two ends of the negative pole body 21 and the two ends of the positive pole body 31 can be prevented from contacting the top cover sheet 1 and causing short circuit when electrically connected with the external circuit or the battery cell, thereby improving the safety and stability of the battery, and since the external circuit is directly electrically connected with the battery cell through the negative pole body 21 and the positive pole body 31, the conductive block structure is saved, thereby reducing the assembly difficulty and reducing the battery internal resistance.

[0038] Referring to Figures 2-4 In some embodiments, the negative pole assembly 2 further comprises a negative pole rubber sleeve 22 covering the side wall of the negative pole body 21, and the positive pole assembly 3 further comprises a positive pole rubber sleeve 32 covering the side wall of the positive pole body 31, and the shape of the two first grooves 11 is matched with the shape of the negative pole rubber sleeve 22 or the positive pole rubber sleeve 32 connected therewith respectively.

[0039] The negative pole post rubber sleeve 22 and the positive pole post rubber sleeve 32 are arranged above the compression ring 4 connected therewith respectively, the negative pole post rubber sleeve 22 covers the one end of the negative pole post body 21 away from the battery cell, the one end of the negative pole post body 21 away from the battery cell protrudes from the negative pole post rubber sleeve 22, the positive pole post rubber sleeve 32 covers the one end of the positive pole post body 31 away from the battery cell, the one end of the positive pole post body 31 away from the battery cell protrudes from the positive pole post rubber sleeve 32, and the two compression rings 4 are overlapped with the negative pole post rubber sleeve 22 and the positive pole post rubber sleeve 32 connected therewith respectively.

[0040] In this way, the negative pole post rubber sleeve 22 and the positive pole post rubber sleeve 32 can insulate and connect the negative pole post body 21 and the positive pole post body 31 with the top cover sheet 1, facilitate the external circuit to realize the electrical connection with the battery cell through the negative pole post body 21 and the positive pole post body 31, reduce the internal resistance of the battery, avoid the short circuit, and improve the safety and stability of the battery.

[0041] Referring to Figure 2 In some embodiments, the shape of the negative pole post rubber sleeve 22 (i.e. the cross-sectional outer edge shape of the negative pole post rubber sleeve 22) is different from the shape of the positive pole post rubber sleeve 32. For example, the shape of the negative pole post rubber sleeve 22 is circular, and the shape of the positive pole post rubber sleeve 32 is square.

[0042] Alternatively, in some embodiments, the shape of the negative pole post rubber sleeve 22 is similar to the shape of the positive pole post rubber sleeve 32, and the cross-sectional area of the negative pole post rubber sleeve 22 is different from the cross-sectional area of the positive pole post rubber sleeve 32. For example, the shape of the negative pole post rubber sleeve 22 and the shape of the positive pole post rubber sleeve 32 are both circular, and the cross-sectional area of the negative pole post rubber sleeve 22 is greater than the cross-sectional area of the positive pole post rubber sleeve 32.

[0043] In this way, in the case that the shape of the negative pole post body 21 and the shape of the positive pole post body 31 are the same, the negative pole post rubber sleeve 22 and the positive pole post rubber sleeve 32 with different shapes or similar shapes but different cross-sectional areas can be correspondingly assembled to the negative pole post body 21 and the positive pole post body 31, so as to improve the assembly efficiency and insulate and connect the negative pole post body 21 and the positive pole post body 31 with the top cover sheet 1.

[0044] It can be understood that the shape and the cross-sectional area of the negative pole post body 21 and the positive pole post body 31 can be adjusted according to actual design needs, and the difference can be distinguished, which will not be listed here.

[0045] Referring to Figure 2 In some embodiments, the negative pole post rubber sleeve 22 is fixedly connected with a negative pole anti-twist part (not shown in the figure), and the positive pole post rubber sleeve 32 is fixedly connected with a positive pole anti-twist part (not shown in the figure). Further, the negative pole anti-twist part is integrally formed with the negative pole post rubber sleeve 22, and the positive pole anti-twist part is integrally formed with the positive pole post rubber sleeve 32.

[0046] In the embodiment, the negative anti-twist part is circumferentially arranged on the side wall of the negative post rubber sleeve 22, so that the cross-sectional shape of the negative anti-twist part and the negative post rubber sleeve 22 is a rounded rectangle, the positive anti-twist part is circumferentially arranged on the side wall of the positive post rubber sleeve 32, so that the cross-sectional shape of the positive anti-twist part and the positive post rubber sleeve 32 is a rounded rectangle, the shape of the second groove 12 is the same as that of the integrally formed negative anti-twist part and the negative post rubber sleeve 22, so that the negative post rubber sleeve 22 and the negative anti-twist part, and the positive post rubber sleeve 32 and the positive anti-twist part can be located in the corresponding second groove 12, and the negative post body 21 and the positive post body 31 are clamped with the top cover sheet 1 to limit the rotation of the negative post body 21 and the positive post body 31.

[0047] In this way, by arranging the negative anti-twist part and the positive anti-twist part, the axial rotation of the negative post body 21 and the positive post body 31 in the second groove 12 can be limited, thereby improving the stability of the battery; the negative anti-twist part and the negative post rubber sleeve 22, and the positive anti-twist part and the positive post rubber sleeve 32 are assembled into the second groove 12, and the pressure ring 4 is welded with the top cover sheet 1, so that the limiting of the negative post body 21 and the positive post body 31 can be realized, the assembly difficulty is reduced, and the assembly efficiency is improved.

[0048] It can be understood that the shape and arrangement position of the negative anti-twist part and the positive anti-twist part can be adjusted according to actual needs, as long as the rotation of the negative post body 21 and the positive post body 31 can be limited, and details are not described herein.

[0049] Referring to Figures 2-4 In some embodiments, the negative post body 21 is connected with a negative protruding part 211, the negative post rubber sleeve 22 covers the negative protruding part 211 and is overlapped with the corresponding pressure ring 4, the positive post body 31 is connected with a positive protruding part 311, and the positive post rubber sleeve 32 covers the positive protruding part 311 and is overlapped with the corresponding pressure ring 4.

[0050] In the embodiment, the negative protruding part 211 and the positive protruding part 311 are both in a stepped structure, the negative post rubber sleeve 22 covers the negative protruding part 211, and the positive post rubber sleeve 32 covers the positive protruding part 311.

[0051] In this way, the negative protruding part 211 and the positive protruding part 311 can be clamped with the pressure ring 4, so that the negative post assembly 2 and the positive post assembly 3 can be limited by the pressure ring 4 and the top cover sheet 1 when the pressure ring 4 is welded with the top cover sheet 1, thereby saving the riveting and welding process of the conductive block, improving the assembly efficiency, enabling the external circuit and the battery cell to be electrically connected through the negative post body 21 and the positive post body 31, and reducing the internal resistance of the battery.

[0052] Referring to Figure 3 and Figure 4In some embodiments, the negative pole post assembly 2 further comprises a negative sealing ring 23, which is arranged between the negative pole post body 21 and the compression ring 4 connected thereto, and the positive pole post assembly 3 further comprises a positive sealing ring 33, which is arranged between the positive pole post body 31 and the compression ring 4 connected thereto.

[0053] In this embodiment, the negative sealing ring 23 and the positive sealing ring 33 are respectively sleeved on the negative pole post body 21 and the positive pole post body 31, and the negative sealing ring 23 is connected with the negative protruding part 211 and the compression ring 4 connected with the negative protruding part 211, and the positive sealing ring 33 is connected with the positive protruding part 311 and the compression ring 4 connected with the positive protruding part 311, and the negative sealing ring 23 and the positive sealing ring 33 are both made of insulating material.

[0054] In this way, the negative sealing ring 23 and the positive sealing ring 33 can make the negative protruding part 211 and the compression ring 4, and the positive protruding part 311 and the compression ring 4 be connected in insulation, so as to avoid the compression ring 4 connected with the positive pole post body 31 and the negative pole post body 21 from short circuiting, improve the safety of the battery, and make the current generated by the battery cell be stably transmitted to the external circuit through the positive pole post body 31 and the negative pole post body 21, thereby reducing the internal resistance of the battery.

[0055] Referring to Figures 3-5 In some embodiments, the cover plate structure further comprises a lower plastic 5 arranged on the side of the top cover sheet 1 facing the battery cell, and the compression ring 4 is arranged between the top cover sheet 1 and the lower plastic 5. In this embodiment, the length direction of the lower plastic 5 is parallel to the length direction of the top cover sheet 1, the lower plastic 5 is made of insulating material, and one end of the negative pole post body 21 and one end of the positive pole post body 31 both protrude from the lower plastic 5.

[0056] In this way, by arranging the lower plastic 5, the negative pole post body 21 and the positive pole post body 31 can be connected in insulation with the top cover sheet 1, so that the battery cell is electrically connected with one end of the negative pole post body 21 protruding from the lower plastic 5 and one end of the positive pole post body 31 protruding from the lower plastic 5, so as to realize the connection between the battery cell and the external circuit, reduce the internal resistance of the battery, and improve the safety and stability of the battery.

[0057] Referring to Figure 2 The utility model also provides a kind of battery, including battery cell, shell (not shown in drawing) and cover plate structure, top cover sheet 1 is connected with shell, and battery cell is arranged in the space enclosed by top cover sheet 1 and shell. Among them, shell is welded with top cover sheet 1, and cover plate structure further includes explosion-proof valve 6, explosion-proof valve 6 is arranged in the middle of top cover sheet 1, and negative pole post assembly 2 and positive pole post assembly 3 are respectively arranged in both ends of top cover sheet 1.

[0058] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A cover structure, characterized by The application relates to a battery cover sheet. The battery cover sheet comprises: a top cover sheet (1) provided with a first groove (11) and a second groove (12) communicating with each other, the second groove (12) being arranged on the side of the first groove (11) away from a battery cell, and the first groove (11) and the second groove (12) being arranged in one-to-one correspondence; a negative pole post assembly (2) and a positive pole post assembly (3), the negative pole post assembly (2) comprising a negative pole post body (21) penetrating the top cover sheet (1), and the positive pole post assembly (3) comprising a positive pole post body (31) penetrating the top cover sheet (1); two compression rings (4) arranged on the side of the negative pole post body (21) facing the battery cell and the side of the positive pole post body (31) facing the battery cell, the projection of the compression ring (4) on the thickness direction of the top cover sheet (1) at least partially overlapping the projection of the corresponding positive pole post body (31) or negative pole post body (21) on the thickness direction of the top cover sheet (1), the compression ring (4) being fixedly connected with the top cover sheet (1) and used for limiting the position of the negative pole post body (21) and the positive pole post body (31) on the top cover sheet (1); the first groove (11) and the second groove (12) are both provided with two grooves, the two first grooves (11) being arranged at the positions of the two compression rings (4) respectively, and the two second grooves (12) being arranged at the positions of the negative pole post body (21) and the positive pole post body (31) respectively.

2. The cover plate structure according to claim 1, wherein The end face of the negative pole post body (21) away from the battery cell and the end face of the positive pole post body (31) away from the battery cell are both arranged protruding from the top cover sheet (1).

3. The cover plate structure according to claim 2, characterized by The negative pole post assembly (2) further comprises a negative pole post rubber coating (22) covering the side wall of the negative pole post body (21), and the positive pole post assembly (3) further comprises a positive pole post rubber coating (32) covering the side wall of the positive pole post body (31), the shapes of the two first grooves (11) being adapted to the shapes of the negative pole post rubber coating (22) or the positive pole post rubber coating (32) connected therewith respectively.

4. The cover plate structure according to claim 3, wherein The shape of the negative pole post rubber coating (22) is different from the shape of the positive pole post rubber coating (32), or the shape of the negative pole post rubber coating (22) is similar to the shape of the positive pole post rubber coating (32), and the cross-sectional area of the negative pole post rubber coating (22) is different from the cross-sectional area of the positive pole post rubber coating (32).

5. The cover plate structure according to claim 3, wherein The negative pole post rubber coating (22) is fixedly connected with a negative pole anti-twist part, and the positive pole post rubber coating (32) is fixedly connected with a positive pole anti-twist part.

6. The cover plate structure according to claim 5, wherein The negative pole anti-twist part is integrally formed with the negative pole post rubber coating (22), and the positive pole anti-twist part is integrally formed with the positive pole post rubber coating (32).

7. The cover plate structure according to claim 3, wherein The negative pole post body (21) is connected with a negative pole protruding part (211), the negative pole post rubber (22) covers the negative pole protruding part (211) and overlaps with the corresponding compression ring (4), the positive pole post body (31) is connected with a positive pole protruding part (311), the positive pole post rubber (32) covers the positive pole protruding part (311) and overlaps with the corresponding compression ring (4).

8. The cover structure according to any one of claims 1 to 7, characterized in that The negative pole post assembly (2) further comprises a negative pole sealing ring (23) arranged between the negative pole post body (21) and the compression ring (4) connected therewith, and the positive pole post assembly (3) further comprises a positive pole sealing ring (33) arranged between the positive pole post body (31) and the compression ring (4) connected therewith.

9. The cover structure according to any one of claims 1 to 7, characterized in that The cover plate structure further comprises a lower plastic (5) arranged on the side of the top cover sheet (1) facing the battery cell, and the compression ring (4) is arranged between the top cover sheet (1) and the lower plastic (5).

10. A battery, characterized by The battery cell, the shell and the cover plate structure according to any one of claims 1-9 are included, the top cover sheet (1) is connected with the shell, and the battery cell is arranged in the space enclosed by the top cover sheet (1) and the shell.

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