CN219180638U - Cover plate structure and battery core - Google Patents

Abstract

The utility model relates to a cover plate structure and an electric core, wherein the cover plate structure comprises a pole block, a top cover, a pole column and an insulating ceramic piece pole block, wherein the pole block is arranged on the outer side of the top cover; the pole is arranged in the first pole hole in a penetrating way, and one end of the pole is connected with the pole block; the insulating ceramic piece comprises a main body part and an extension part, wherein the main body part and the extension part are connected, the main body part is clamped between the pole block and the top cover, and the extension part is clamped between the hole wall of the first pole hole and the outer wall of the pole. The main body part of the insulating ceramic part is clamped between the pole block and the top cover, so that the extension part extends into the first pole column hole, the pole column penetrates through the first pole column hole and is connected to the pole block, and the extension part is clamped between the hole wall of the first pole column hole and the outer wall of the pole column, so that the insulating ceramic part is fixed. Moreover, the extension part of the insulating ceramic piece is clamped between the hole wall of the first pole hole and the outer wall of the pole, namely, the extension part wraps part of the pole, so that the outer wall of the pole and the hole wall of the first pole hole are prevented from being conducted.

Description

Cover plate structure and battery core

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate structure and an electric core.

Background

The existing cover plate structure comprises a top cover, an upper plastic, a lower plastic, a pole column and a pole block, wherein the pole column sequentially penetrates through the lower plastic, the top cover, the upper plastic and the riveting block and is in riveting connection with the pole block, and the upper plastic is arranged between the pole column and the top cover to play a role in insulation and support. However, the upper plastic is made of plastic materials, and the upper plastic may crack and fail under the action of external force, so that the pole block is in contact conduction with the top cover, and the insulation characteristic of the upper plastic fails, so that the stability of the whole cover plate structure is affected.

Disclosure of Invention

Based on this, it is necessary to provide a cover plate structure against the insulation problem of the cover plate structure.

A cover plate structure, comprising:

a pole block;

the pole block is arranged on the outer side of the top cover, and a first pole column hole is formed in the top cover;

the pole is penetrated in the first pole hole, and one end of the pole is connected with the pole block;

the insulating ceramic piece comprises a main body part and an extension part, wherein the main body part and the extension part are connected, the main body part is clamped between the pole block and the top cover, and the extension part is clamped between the hole wall of the first pole hole and the outer wall of the pole.

In one embodiment, a receiving groove is formed in the side, facing away from the top cover, of the main body portion, and the pole piece portion is located in the receiving groove.

In one embodiment, a limiting boss is arranged on the side wall of the accommodating groove, and the limiting boss is abutted with the outer wall of the pole block.

In one embodiment, the device further comprises an insulating sealing ring, wherein the insulating sealing ring is clamped between the extension part and the top cover.

In one embodiment, the insulating sealing ring comprises a first section and a second section which are connected along the axial direction, wherein the outer contour of the first section is larger than that of the second section, so that a first step surface is formed at the joint of the outer peripheral surface of the first section and the outer peripheral surface of the second section;

the first pole hole comprises a first hole and a second hole which are communicated in the axial direction, and the aperture of the first hole is smaller than that of the second hole; the second section mates with the second aperture such that the first step surface overlaps the top cover.

In one embodiment, the insulating sealing ring comprises a third section, one end of the first section, which is away from the second section, is connected with the third section, and the outer contour of the first section is larger than that of the third section;

the cover plate structure also comprises lower plastic, wherein the lower plastic is provided with a second pole hole for the pole to pass through, the second pole hole comprises a third hole and a fourth hole which are communicated along the axial direction, the aperture of the third hole is smaller than that of the fourth hole, the first section is matched with the fourth hole, and the third section is matched with the third hole.

In one embodiment, the lower plastic is an elastic plastic, and the lower plastic can be switched between an unfolded state and a folded state by elastic deformation;

the lower plastic comprises a lower plastic body and an exceeding part which are connected, and when the lower plastic is in the unfolding state, the exceeding part exceeds the pole from one end of the lower plastic body to the direction deviating from the top cover; when the lower plastic is in the bending state, the exceeding part bends outwards relative to the lower plastic body.

In one embodiment, a bending groove is formed on the outer side of the connection part between the lower plastic body and the protruding part.

In one embodiment, the device further comprises an elastic connecting piece, wherein the elastic connecting piece can be switched between a first state and a second state through elastic deformation;

the elastic connecting piece comprises a first connecting piece and a second connecting piece which are connected, the first connecting piece is connected to one end of the pole far away from the pole block, and the second connecting piece is used for being connected to the pole group;

when the elastic connecting piece is in the first state, the second connecting piece is folded at one side of the first connecting piece, which is away from the pole; when the elastic connecting piece is in the second state, the second connecting piece is unfolded relative to the first connecting piece.

In one embodiment, a welding protrusion is disposed at one end of the pole connected to the pole block, a welding pole hole is disposed on the pole block, the welding protrusion is configured to extend into the welding pole hole, and the welding protrusion is welded to the hole wall of the welding pole hole by laser.

The utility model also provides an electric core which comprises a pole group and the cover plate structure, wherein the pole group is connected with the pole post.

The utility model has the beneficial effects that:

above-mentioned apron structure sets up the utmost point piece in one side of top cap, locates the main part clamp of insulating ceramic spare between utmost point piece and the top cap to make extension stretch into in the first utmost point post hole, the utmost point post passes first utmost point post hole and connects in the utmost point piece, thereby makes extension clamp locate between the pore wall in first utmost point post hole and the outer wall of utmost point post, has fixed insulating ceramic spare. Compared with the existing plastic, the insulating ceramic piece is made of ceramic materials, the insulating ceramic piece not only has insulating characteristics, but also can bear larger stress, the insulating ceramic piece is not easy to crack when being acted by external force, the contact conduction between the pole block and the top cover is prevented, and the insulating characteristics of the top cover are maintained.

Drawings

Fig. 1 is a schematic structural diagram of a cover plate structure according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a cover plate structure according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a cover plate structure according to an embodiment of the present utility model;

FIG. 4 is a partial cross-sectional view of a cover plate structure provided by an embodiment of the present utility model;

FIG. 5 is a schematic structural view of an insulating ceramic member according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of an insulating seal provided in an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of an insulating seal provided by an embodiment of the present utility model;

fig. 8 is a schematic structural view of a pole according to an embodiment of the present utility model;

FIG. 9 is a schematic diagram of a lower plastic structure according to an embodiment of the present utility model;

FIG. 10 is a schematic diagram of a cover structure and pole set connection according to an embodiment of the present utility model;

FIG. 11 is a cross-sectional view of a cover plate structure and pole set connection provided by an embodiment of the present utility model;

fig. 12 is a schematic structural diagram of a positive electrode cover plate structure and a positive electrode group connection according to an embodiment of the present utility model;

FIG. 13 is an enlarged view of a portion of the connection between the positive plate structure and the positive plate assembly according to an embodiment of the present utility model;

fig. 14 is a schematic structural diagram of a negative electrode cover plate structure according to an embodiment of the present utility model.

In the figure:

100. a pole block; 110. welding the pole hole;

200. a top cover; 210. a first post hole; 211. a first hole; 212. a second hole; 220. a receiving groove; 230. a limit boss; 240. a liquid injection hole;

300. a pole; 310. welding the protrusions; 320. welding the table top;

400. an insulating ceramic member; 410. a main body portion; 411. a receiving groove; 412. a limit boss; 420. an extension; 430. a through hole;

500. an insulating seal ring; 510. a first section; 520. a second section; 530. a first step surface; 540. a third section; 550. a third step surface;

600. lower plastic; 610. a second post hole; 611. a third hole; 612. a fourth hole; 620. a lower plastic body; 621. a weight reduction groove; 622. reinforcing ribs; 630. an excess portion; 640. bending the groove;

700. an elastic connecting piece;

800. a pole group;

900. an explosion-proof assembly; 910. explosion-proof sheet; 920. and protecting the patch.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The embodiment of the utility model provides a cover plate structure, as shown in fig. 1 to 4, the cover plate structure comprises a pole block 100, a top cover 200, a pole column 300 and an insulating ceramic piece 400, wherein the pole block 100 is arranged at the outer side of the top cover 200, and a first pole column hole 210 is arranged on the top cover 200; the pole 300 is penetrated through the first pole hole 210, and one end of the pole 300 is connected with the pole block 100; the insulating ceramic member 400 includes a body portion 410 and an extension portion 420, wherein the body portion 410 is sandwiched between the pole block 100 and the top cover 200, and the extension portion 420 is sandwiched between the wall of the first pole hole 210 and the outer wall of the pole 300.

In the above cover plate structure, the pole block 100 is disposed on one side of the top cover 200, the main body portion 410 of the insulating ceramic member 400 is sandwiched between the pole block 100 and the top cover 200, so that the extension portion 420 extends into the first pole hole 210, the pole 300 passes through the first pole hole 210 and is connected to the pole block 100, and the extension portion 420 is sandwiched between the wall of the first pole hole 210 and the outer wall of the pole 300, so that the insulating ceramic member 400 is fixed. Moreover, the extension part 420 of the insulating ceramic member 400 extends into the first pole hole 210, and is sandwiched between the hole wall of the first pole hole 210 and the outer wall of the pole 300, i.e. the part of the extension part 420 wrapping the pole 300, so as to prevent the outer wall of the pole 300 and the hole wall of the first pole hole 210 from being conducted, i.e. prevent the pole 300 and the top cover 200 from being conducted. Compared with the existing cover plate structure adopting plastic, the insulating ceramic piece 400 is made of ceramic materials, the insulating ceramic piece 400 not only has insulating characteristics, but also has larger stress which the insulating ceramic piece 400 can bear, the insulating ceramic piece 400 is not easy to crack when being acted by external force, the contact conduction between the pole block 100 and the top cover 200 is prevented, and the insulating characteristics of the top cover 200 are maintained.

As shown in fig. 4 and 5, a receiving slot 411 is formed on a side of the body portion 410 facing away from the top cover 200, and the pole piece 100 is partially located in the receiving slot 411. The end surface of the main body 410 of the insulating ceramic member 400 facing away from the top cover 200 is provided with a receiving slot 411, and the pole piece 100 is partially disposed in the receiving slot 411, so that the pole piece 100 is positioned, and the connection between the pole piece 100 and the pole post 300 is facilitated.

Specifically, as shown in fig. 4 and 5, a limit boss 412 is provided on a side wall of the receiving slot 411, and the limit boss 412 abuts against an outer wall of the pole block 100. By providing the limit boss 412 on the side wall of the accommodating slot 411, when the pole block 100 is partially disposed in the accommodating slot 411, the limit boss 412 abuts against the outer wall of the pole block 100, thereby limiting the movement of the pole block 100 in the radial direction of the pole post 300.

More specifically, as shown in fig. 4 and 5, the limit boss 412 extends in the axial direction of the pole 300, and the limit boss 412 is provided in plurality, and the plurality of limit bosses 412 are distributed in the circumferential direction of the pole block 100.

Specifically, as shown in fig. 4 and 5, a through hole 430 is provided through the insulating ceramic member 400, and the through hole 430 is used for passing the post 300. It will be appreciated that the insulating ceramic member 400 is provided with a through hole 430 therethrough, that is, the through hole 430 is provided through the body portion 410 and the extension portion 420.

As shown in fig. 4, 6 and 7, the cover plate structure further includes an insulating sealing ring 500, and the insulating sealing ring 500 is sandwiched between the extension 420 and the top cover 200. By providing the insulating seal ring 500, the insulating seal ring 500 is sleeved on the extension portion 420, so that the insulating seal ring 500 is clamped between the extension portion 420 and the top cover 200, the gap between the extension portion 420 and the top cover 200 is sealed, and the insulating seal ring 500 has insulating properties as well, so that the pole 300 and the hole wall of the first pole hole 210 are prevented from being conducted.

Specifically, as shown in fig. 4, 6 and 7, the insulating seal ring 500 includes a first segment 510 and a second segment 520 connected in an axial direction, an outer contour of the first segment 510 is larger than an outer contour of the second segment 520, so that a junction between an outer circumferential surface of the first segment 510 and an outer circumferential surface of the second segment 520 forms a first step surface 530; the first pole hole 210 includes a first hole 211 and a second hole 212 which are communicated in the axial direction, and the aperture of the first hole 211 is smaller than that of the second hole 212; the second section 520 mates with the second aperture 212 such that the first step surface 530 overlaps the top cover 200. The outer contour of the first section 510 is larger than that of the second section 520, that is, the dimension of the first section 510 is larger than that of the second section 520 along the axial direction perpendicular to the pole block 100, so that a first step surface 530 is formed at the joint of the outer peripheral surface of the first section 510 and the outer peripheral surface of the second section 520, the first pole hole 210 is a stepped hole, the aperture of the first hole 211 is smaller than that of the second hole 212, the second section 520 extends into the second hole 212, the first step surface 530 is attached to the inner surface of the top cover 200, the lap joint structure of the insulating sealing ring 500 and the top cover 200 is realized, and the insulating property of the top cover 200 is enhanced.

More specifically, as shown in fig. 4, 6 and 7, the first pole hole 210 is a stepped hole, the aperture of the first hole 211 is smaller than that of the second hole 212 along the axial direction of the pole 300, a second step surface is formed at the connection between the hole wall of the first hole 211 and the hole wall of the second hole 212, when the second section 520 of the insulating seal ring 500 extends into the second hole 212, the first step surface 530 is attached to the inner surface of the top cover 200, and the second step surface is attached to the end surface of the side of the second section 520 facing away from the first section 510, so that the insulating seal ring 500 is overlapped with the top cover 200. It will be appreciated that the second section 520 of the insulating seal 500 extends into the second bore 212 to mate therewith, and the wall of the first bore 211 conforms to the outer wall of the extension 420.

Specifically, as shown in fig. 4, 6 and 7, the insulating sealing ring 500 includes a third segment 540, one end of the first segment 510 facing away from the second segment 520 is connected to the third segment 540, and the outer contour of the first segment 510 is larger than the outer contour of the third segment 540; the cover plate structure further comprises a lower plastic 600, the lower plastic 600 is provided with a second pole hole 610 for the pole 300 to pass through, the second pole hole 610 comprises a third hole 611 and a fourth hole 612 which are communicated with each other along the axial direction, the aperture of the third hole 611 is smaller than that of the fourth hole 612, the first section 510 is matched with the fourth hole 612, and the third section 540 is matched with the third hole 611. The third section 540 is connected to one side of the first section 510 of the insulating sealing ring 500, which is away from the second section 520, the second pole hole 610 on the lower plastic 600 is set as a stepped hole, the aperture of the third hole 611 is smaller than that of the fourth hole 612, the third section 540 extends into the third hole 611 to be matched with the third hole, and the first section 510 extends into the fourth hole 612 to be matched with the fourth hole, so that a lap joint structure between the lower plastic 600 and the insulating sealing ring 500 is realized, and the insulating property of the lower plastic 600 is enhanced.

More specifically, as shown in fig. 4, 6 and 7, one end of the first section 510 facing away from the second section 520 is connected with the third section 540, and the outer contour of the first section 510 is larger than that of the third section 540, so that a third step surface 550 is formed at the connection position between the outer circumferential surface of the first section 510 and the outer circumferential surface of the third section 540, the second pole hole 610 is a stepped hole, the aperture of the third hole 611 is smaller than that of the fourth hole 612 along the axial direction of the pole 300, a fourth step surface is formed at the connection position between the hole wall of the third hole 611 and the hole wall of the fourth hole 612, and when the third section 540 of the insulating seal ring 500 extends into the third hole 611, the third step surface 550 is attached to the fourth step surface, so that the insulating seal ring 500 is in lap connection with the lower plastic 600, and the insulating reliability is increased.

As shown in fig. 4 and 8, one end of the pole 300 connected to the pole block 100 is provided with a welding protrusion 310, the pole block 100 is provided with a welding pole hole 110, and the welding protrusion 310 is configured to extend into the welding pole hole 110 and be welded to the hole wall of the welding pole hole 110 by laser. By providing the welding protrusion 310, the welding protrusion 310 is inserted into the welding post hole 110, and the pole block 100 and the pole 300 are coupled using a laser welding technique, thereby fixing the insulating ceramic 400 and the insulating sealing ring 500. The assembly work of the cover plate structure is performed by laser welding the side walls of the welding protrusions 310 and the hole walls of the welding post holes 110.

Preferably, as shown in fig. 4 and 8, the upper surface of the welding projection 310 is positioned in the welding post hole 110, ensuring that the weld is not higher than the pole piece 100 after the laser welding is completed. For example, after the assembly is completed, the welding boss of the tab 300 is 0.5mm lower than the positive block 100.

Preferably, as shown in fig. 4 and 8, welding positioning holes are provided on the upper surface of the welding protrusions 310 for welding positioning during the grouping of the cover plate structure.

Preferably, as shown in fig. 4 and 8, a welding table 320 is provided on the pole 300, and the outer contour of the welding protrusion 310 is greater than the outer contour of the pole 300 in the radial direction of the pole 300, so that the junction of the outer wall of the welding protrusion 310 and the outer wall of the pole 300 forms the welding table 320, and the welding table 320 is a stepped surface. The welding table 320 not only plays a role of bearing the pole block 100, but also can prevent laser from penetrating into the deep part of the weld joint in the laser welding process, damage the parts such as the lower plastic 600, the insulating sealing ring 500 and the like, and improve the yield of the cover plate structure.

Preferably, as shown in fig. 4 and 9, a weight-reducing groove 621 is provided on the end surface of the lower plastic body 620 near the top cover 200, so as to reduce the weight of the lower plastic 600, reduce the weight of the cover plate structure, and a reinforcing rib 622 is provided on the bottom wall of the weight-reducing groove 621, so as to increase the structural strength of the lower plastic 600.

As shown in fig. 4, 9 and 10, the lower plastic 600 is an elastic plastic, and the lower plastic 600 can be switched between an unfolded state and a folded state by elastic deformation; the lower plastic 600 includes a lower plastic body 620 and an extending portion 630, wherein the extending portion 630 extends beyond the pole 300 from one end of the lower plastic body 620 away from the top cover 200 when the lower plastic 600 is in the unfolded state; when the lower plastic 600 is in the folded state, the protruding portion 630 is folded outwards relative to the lower plastic body 620. The lower plastic 600 is made of an elastic plastic material, when the lower plastic 600 is in a unfolded state, the exceeding part 630 exceeds the pole 300 from one end of the lower plastic body 620 to the direction away from the top cover 200, so that a certain insulation protection effect is achieved on the pole 300, and under the action of external force, the lower plastic 600 is switched from the unfolded state to a bending state through elastic deformation, so that the connection between the pole 300 and the pole group 800 of the battery cell is conveniently realized. When the pole 300 of the cover plate structure needs to be welded with the pole piece of the pole group 800, the exceeding part 630 can be bent for 90 degrees under the action of external force, so that the whole welding process is convenient to carry out, and the lower plastic 600 is in a bending state; when the welding of the pole pieces of the pole 300 and the pole group 800 is completed, the exceeding part 630 is reset under the self resilience force, and the lower plastic 600 is in an unfolding state, so that the welding position of the pole 300 and the pole pieces is insulated and protected. Specifically, the protruding portion 630 and the plastic body 620 are integrally formed.

Specifically, as shown in fig. 4 and fig. 9 to 11, a bending groove 640 is provided on the outer side of the connection between the lower plastic body 620 and the protruding portion 630. Bending of the excess portion 630 is facilitated by providing a bending groove 640 at the outer side of the junction of the lower plastic body 620 and the excess portion 630. More specifically, the bending groove 640 extends in a direction perpendicular to the axis of the pole 300.

As shown in fig. 10 to 13, the cover structure further includes an elastic connection piece 700, the elastic connection piece 700 being switchable between a first state and a second state by elastic deformation; the elastic connection piece 700 comprises a first connection piece and a second connection piece which are connected, wherein the first connection piece is connected to one end of the pole 300, which is far away from the pole block 100, and the second connection piece is used for being connected to the pole group 800; when the elastic connecting piece 700 is in the first state, the second connecting piece is folded on one side of the first connecting piece, which is away from the pole 300; the elastic connection tab 700 is in the second state, with the second connection tab being unfolded relative to the first connection tab. The first connecting piece of the elastic connecting piece 700 is connected to the pole 300, the second connecting piece is connected to the pole set 800, and in the first state, the second connecting piece can be folded relative to the first connecting piece, so that the pole set 800 is located below the lower plastic 600 (below as shown in fig. 10), and in the second state, the elastic connecting piece 700 is unfolded relative to the first connecting piece, so that the pole set 800 is located outside the protruding portion 630 of the lower plastic 600. By arranging the elastic connection piece 700, when the pole 300 of the cover plate structure needs to be welded with the pole piece of the pole group 800, the first connection piece of the elastic connection piece 700 is connected to the pole 300, the pole group 800 is positioned at the outer side of the lower plastic 600, then the second connection piece is unfolded relative to the first connection piece, the second connection piece of the elastic connection piece 700 is welded with the pole piece of the pole group 800, at the moment, the elastic connection piece 700 is in a second state, and the lower plastic 600 is in a bending state; after the welding of the elastic connection piece 700 and the pole piece of the pole group 800 is completed, the second connection piece of the elastic connection piece 700 is folded relative to the first connection piece, and is in the first state, the exceeding part 630 is reset under the self resilience force, and the lower plastic 600 is switched to the unfolding state.

It should be noted that, the cover plate structure provided in this embodiment may be the positive electrode cover plate structure shown in fig. 12 and 13, or may be the negative electrode cover plate structure shown in fig. 14, where the difference between the positive electrode cover plate structure and the negative electrode cover plate structure is that the electrode post 300 is a positive electrode post or a negative electrode post.

Specifically, as shown in fig. 12 and 13, when the cap plate structure is a positive cap plate structure, the post 300 is a positive post for welding with the positive plate of the pole group 800.

More specifically, referring back to fig. 2, 12 and 13, when the cover plate structure is an anode cover plate structure, the cover plate structure further includes an explosion-proof assembly 900 disposed on the top cover 200, the explosion-proof assembly 900 includes an explosion-proof sheet 910 and a protective patch 920, the explosion-proof sheet 910 is bonded to the top cover 200 by welding or glue, and the protective patch 920 is bonded to the top cover 200 by glue.

Specifically, as shown in fig. 14, when the cap plate structure is a negative cap plate structure, the post 300 is a negative post for welding with the negative tab of the electrode group 800. More specifically, the top cap 200 is provided with the liquid injection hole 240 communicated with the battery cell, the explosion-proof assembly 900 is not provided, and other structures are the same as those of the positive electrode cover plate.

The embodiment of the utility model also provides a battery cell, which comprises the electrode group 800 and the cover plate structure, wherein the electrode group 800 is connected to the electrode post 300. The pole group 800 of the battery cell is connected with the pole 300 so that the pole 300 has conductivity to facilitate external power supply.

It should be noted that, in the battery core provided in this embodiment, when the electrode group 800 is connected to the electrode post 300, the positive electrode plate of the electrode group 800 is connected to the positive electrode post of the positive electrode cover plate structure, and the negative electrode plate of the electrode group 800 is connected to the negative electrode post of the negative electrode cover plate structure.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (11)

1. A cover plate structure, comprising:

a pole block (100);

the top cover (200), the pole block (100) is arranged at the outer side of the top cover (200), and a first pole hole (210) is formed in the top cover (200);

the pole (300) is penetrated through the first pole hole (210), and one end of the pole (300) is connected with the pole block (100);

the insulating ceramic piece (400) comprises a main body part (410) and an extension part (420) which are connected, wherein the main body part (410) is clamped between the pole block (100) and the top cover (200), and the extension part (420) is clamped between the hole wall of the first pole hole (210) and the outer wall of the pole (300).

2. The cover plate structure according to claim 1, wherein a receiving groove (411) is provided on a side of the main body portion (410) facing away from the top cover (200), and the pole piece (100) is partially located in the receiving groove (411).

3. The cover plate structure according to claim 2, wherein a limit boss (412) is provided on a side wall of the accommodating groove (411), and the limit boss (412) abuts against an outer wall of the pole block (100).

4. The cover plate structure of claim 1, further comprising an insulating seal ring (500), the insulating seal ring (500) being sandwiched between the extension (420) and the top cover (200).

5. The cover structure of claim 4, wherein,

the insulating sealing ring (500) comprises a first section (510) and a second section (520) which are connected along the axial direction, wherein the outer contour of the first section (510) is larger than that of the second section (520), so that a first step surface (530) is formed at the joint of the outer peripheral surface of the first section (510) and the outer peripheral surface of the second section (520);

the first pole hole (210) comprises a first hole (211) and a second hole (212) which are communicated in the axial direction, and the aperture of the first hole (211) is smaller than that of the second hole (212); the second section (520) mates with the second aperture (212) such that the first step surface (530) overlaps the top cover (200).

6. The cover structure of claim 5, wherein,

the insulating sealing ring (500) comprises a third section (540), one end of the first section (510) deviating from the second section (520) is connected with the third section (540), and the outer contour of the first section (510) is larger than that of the third section (540);

the cover plate structure also comprises a lower plastic (600), the lower plastic (600) is provided with a second pole hole (610) for the pole (300) to pass through, the second pole hole (610) comprises a third hole (611) and a fourth hole (612) which are communicated with each other along the axial direction, the aperture of the third hole (611) is smaller than that of the fourth hole (612), the first section (510) is matched with the fourth hole (612), and the third section (540) is matched with the third hole (611).

7. The cover structure of claim 6, wherein,

the lower plastic (600) is elastic plastic, and the lower plastic (600) can be switched between an unfolding state and a bending state through elastic deformation;

the lower plastic (600) comprises a lower plastic body (620) and an exceeding part (630) which are connected, wherein when the lower plastic (600) is in the unfolding state, the exceeding part (630) exceeds the pole (300) from one end of the lower plastic body (620) to the direction deviating from the top cover (200); when the lower plastic (600) is in the bending state, the protruding part (630) bends outwards relative to the lower plastic body (620).

8. The cover plate structure according to claim 7, wherein a bending groove (640) is provided on the outer side of the junction of the lower plastic body (620) and the protruding portion (630).

9. The cover structure according to claim 8, further comprising an elastic connection piece (700), the elastic connection piece (700) being switchable between a first state and a second state by elastic deformation;

the elastic connecting piece (700) comprises a first connecting piece and a second connecting piece which are connected, wherein the first connecting piece is connected to one end of the pole post (300) far away from the pole block (100), and the second connecting piece is used for being connected to the pole group (800);

when the elastic connecting sheet (700) is in the first state, the second connecting sheet is folded on one side of the first connecting sheet, which faces away from the pole (300); the elastic connection piece (700) is unfolded relative to the first connection piece in the second state.

10. The cover plate structure according to claim 1, wherein a welding protrusion (310) is provided at one end of the pole (300) connected to the pole block (100), a welding pole hole (110) is provided on the pole block (100), the welding protrusion (310) is configured to extend into the welding pole hole (110), and laser-welded to a hole wall of the welding pole hole (110).

11. A battery cell comprising a pole set (800) and the cover structure of any of claims 1-10, the pole set (800) being connected to the pole (300).

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