CN220189784U - Battery and cover plate assembly - Google Patents

Abstract

The embodiment of the utility model provides a battery and a cover plate assembly, wherein the battery comprises the cover plate assembly, a shell and a battery cell, the shell comprises an installation cavity, the battery cell is arranged in the installation cavity, and the cover plate assembly is covered at an opening of the installation cavity; the cover plate assembly includes: the cover plate is provided with a positive electrode mounting hole and a negative electrode mounting hole; a positive electrode post; a negative electrode column; the battery cell comprises a positive electrode lug and a negative electrode lug; the positive pole comprises a positive pole body and a first positive pole fixing part, and the positive pole body comprises a positive pole flanging part; the first positive electrode fixing part and the positive electrode flanging part extend along the surface of the cover plate respectively; the negative pole column comprises a negative pole column body and a first negative pole fixing part, and the negative pole column body comprises a negative pole flanging part; the first negative electrode fixing portion and the negative electrode hemming portion extend along the surface of the cap plate, respectively. The battery and the cover plate assembly provided by the embodiment of the utility model can improve the connection reliability between the pole and the cover plate.

Description

Battery and cover plate assembly

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery and a cover plate assembly.

Background

The industries such as electric automobiles, energy storage industry and the like are rapidly developed nowadays, and batteries are important components of related industries, have direct influence on various properties of corresponding products, and are increasingly demanded nowadays. The battery is usually a lead-acid battery, a lithium ion battery, a nickel-cadmium battery or the like.

The structure of the battery generally comprises a cover plate, wherein a pole is arranged on the cover plate, and the ceramic pole and the split injection molding pole in the market at present are connected with the cover plate by adopting an aluminum disc, so that the strength of the pole is poor, the structure is easy to fail, the sealing performance of the pole is reduced, and liquid leakage is generated; the riveting pole column has higher strength, but because of more parts and manufacturing procedures, the manufacturing cost is relatively higher; the integrated injection molding pole has a simple structure, but the integrated injection molding pole is easy to have injection molding shortage, and when the insulating part and the optical cover plate are not combined in place, the pole has poor strength, and the sealing performance cannot be ensured. Therefore, how to provide a battery with improved connection reliability between the cap plate and the post is a problem that needs to be solved.

Disclosure of Invention

The utility model provides a battery and a cover plate assembly, which can improve the connection reliability between a cover plate and a pole.

In a first aspect, a battery, a cover plate assembly, a housing and a battery cell are provided, wherein the housing comprises a mounting cavity, the battery cell is arranged in the mounting cavity, and the cover plate assembly is covered at an opening of the mounting cavity;

the cover plate assembly includes: the cover plate is provided with a positive electrode mounting hole and a negative electrode mounting hole; the positive pole is arranged in the positive pole mounting hole; a negative electrode post mounted in the negative electrode mounting hole;

the battery cell comprises a positive electrode lug and a negative electrode lug, wherein the positive electrode lug is connected with the positive electrode post, and the negative electrode lug is connected with the negative electrode post;

the positive pole comprises a positive pole body and a first positive pole fixing part, and the positive pole body comprises a positive pole flanging part; the first positive electrode fixing portion and the positive electrode flanging portion extend along the surface direction of the cover plate respectively so as to fix the cover plate between the first positive electrode fixing portion and the positive electrode flanging portion;

the negative pole column comprises a negative pole column body and a first negative pole fixing part, and the negative pole column body comprises a negative pole flanging part; the first negative electrode fixing portion and the negative electrode hemming portion extend along a surface direction of the cap plate, respectively, to fix the cap plate between the first negative electrode fixing portion and the negative electrode hemming portion.

The embodiment of the utility model simplifies the cover plate structure of the battery, and improves the reliability and the tightness of the connection between the pole post and the cover plate and the reliability of the battery in the use process by connecting the pole post and the cover plate through the first positive/negative pole fixing part and the positive/negative pole flanging part of the pole post.

In some embodiments, the positive tab portion is formed from the positive post being turned-out; and/or the negative electrode flanging part is formed by flanging the negative electrode column outwards.

In some embodiments, the positive electrode post comprises a straight edge structure or a pre-hemmed structure, the positive electrode hemmed portion being formed by bending the straight edge structure or the pre-hemmed structure of the positive electrode post; and/or the negative electrode column body comprises a straight edge structure or a pre-flanging structure, and the negative electrode flanging part is formed by bending the straight edge structure or the pre-flanging structure of the negative electrode column body.

In some embodiments, the cover plate is provided with a first concave portion along the edge of the positive electrode mounting hole, a first positive electrode rotation preventing structure is arranged on the side wall, connected with the first concave portion, of the surface of the cover plate, a second positive electrode rotation preventing structure is arranged on the side wall of the positive electrode column, and after the positive electrode column is connected with the positive electrode mounting hole, an insulating portion is filled among the first concave portion, the first positive electrode rotation preventing structure and the second positive electrode rotation preventing structure, so that torsion preventing force is formed among the first positive electrode rotation preventing structure, the second positive electrode rotation preventing structure and the insulating portion; and/or the cover plate is provided with a second concave part along the edge of the negative electrode mounting hole, a first negative electrode rotation preventing structure is arranged on the side wall, connected with the second concave part, of the cover plate surface, a second negative electrode rotation preventing structure is arranged on the side wall of the negative electrode column body, and after the negative electrode column body is connected with the negative electrode mounting hole, an insulating part is filled between the second concave part, the first negative electrode rotation preventing structure and the second negative electrode rotation preventing structure, so that a torsion preventing force is formed between the first negative electrode rotation preventing structure and the negative electrode insulating part.

In the embodiment of the utility model, the first concave part, the second concave part, the first positive/negative electrode rotation preventing structure and the second positive/negative electrode rotation preventing structure are arranged, so that the positive/negative electrode mounting holes, the positive/negative electrode columns and the insulating parts are connected in a matched manner, the torsional strength of the positive/negative electrode columns is effectively improved, and the safety and the reliability of actual use are improved. In addition, the design of apron and utmost point post also makes to have suitable creepage distance between apron and the utmost point post, has avoided because of creepage distance is too little leads to short circuit scheduling problem.

In some embodiments, the battery further comprises: and the sealing ring is arranged between the positive pole and the cover plate and/or between the negative pole and the cover plate.

According to the embodiment of the utility model, the compression stability of the sealing ring is increased through the connection among the fixed cover plate, the polar post and the sealing ring, so that the sealing ring cannot be reduced in compression rate due to the softening of the injection molding insulating part, and the safety and reliability of the battery in the use process are improved.

In some embodiments, the battery further comprises: the insulating plate is arranged between the cover plate and the positive electrode flanging part and between the cover plate and the negative electrode flanging part; the insulating plate is fixed by the positive electrode flange portion and the negative electrode flange portion.

According to the embodiment of the utility model, the battery core and the cover plate can be isolated by arranging the insulating plate, so that the battery is prevented from being short-circuited, and meanwhile, the positive electrode flanging part and the negative electrode flanging part fix the insulating plate, so that the safety and the reliability of the battery in the use process are improved.

In some embodiments, the outer dimension of the positive electrode post is smaller than the hole dimension of the positive electrode mounting hole; the outer outline size of the cathode column body is smaller than the hole size of the cathode mounting hole.

In the embodiment of the utility model, before the positive/negative pole column is connected with the cover plate, the outer contour dimension of the positive/negative pole column is smaller than the hole dimension of the positive/negative pole mounting hole, so that the positive/negative pole column is conveniently mounted on the cover plate, meanwhile, the suitability of the pole column is improved, the poles with different outer contour dimensions can be mounted on the cover plate, and the reliability of the battery in the use process is improved through the connection between the flanging fixing and the cover plate.

In some embodiments, the battery further comprises: the positive electrode connecting sheet is connected with the positive electrode post and used for transmitting current; and/or a negative electrode connecting piece connected with the negative electrode column and used for transmitting current.

In some embodiments, the positive electrode connection piece is in penetration welding connection with the positive electrode post, or the positive electrode connection piece is in seam welding connection with a side wall of the positive electrode flanging part of the positive electrode post; and/or the negative electrode connecting piece is connected with the negative electrode column in a penetrating way, or the negative electrode connecting piece is connected with the negative electrode column in a seam welding way, or the negative electrode connecting piece is connected with the side wall of the negative electrode flanging part of the negative electrode column in a seam welding way.

In the embodiment of the utility model, the positive/negative electrode connecting sheet is connected with the positive/negative electrode column to carry out current transmission in the battery, so that the suitability of the positive/negative connecting sheet is improved, and the reliability of the battery in the use process is improved.

In some embodiments, the positive electrode tab is connected to the positive electrode tab such that the positive electrode tab is connected to the positive electrode post through the positive electrode tab; and/or the second surface of the negative electrode connecting sheet is connected with the negative electrode lug, so that the negative electrode lug is connected with the negative electrode post through the negative electrode connecting sheet.

In some embodiments, the battery further comprises: the explosion-proof valve is arranged on the inner surface of the cover plate; and the explosion-proof patch is arranged on the outer surface of the cover plate and is attached to the explosion-proof valve.

In a second aspect, there is provided a cover plate assembly comprising: the cover plate is provided with a positive electrode mounting hole and a negative electrode mounting hole; the positive pole is arranged in the positive pole mounting hole; a negative electrode post mounted in the negative electrode mounting hole; the positive pole comprises a positive pole body and a first positive pole fixing part, and the positive pole body comprises a positive pole flanging part; the first positive electrode fixing portion and the positive electrode flanging portion extend along the surface direction of the cover plate respectively so as to fix the cover plate between the first positive electrode fixing portion and the positive electrode flanging portion; the negative pole column comprises a negative pole column body and a first negative pole fixing part, and the negative pole column body comprises a negative pole flanging part; the first negative electrode fixing portion and the negative electrode hemming portion extend along a surface direction of the cap plate, respectively, to fix the cap plate between the first negative electrode fixing portion and the negative electrode hemming portion.

Drawings

Fig. 1 is an exploded view of a cover assembly according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional structure of a positive electrode column and a negative electrode column suitable for use in an embodiment of the present utility model.

Fig. 3 is a schematic cross-sectional structure of a positive electrode column and a negative electrode column suitable for use in an embodiment of the present utility model.

Fig. 4 is a schematic cross-sectional structure of a positive electrode column and a negative electrode column suitable for use in an embodiment of the present utility model.

Fig. 5 is a schematic view of a positive mounting hole suitable for use in an embodiment of the present utility model.

Fig. 6 is a schematic view of a positive electrode post suitable for use in an embodiment of the present utility model.

Fig. 7 is a schematic cross-sectional structure of a positive electrode post and a negative electrode post suitable for use in an embodiment of the present utility model.

Fig. 8 is an exploded view of a cover assembly according to an embodiment of the present utility model.

Fig. 9 is a schematic view of a positive tab and a negative tab suitable for use in an embodiment of the utility model.

Fig. 10 is a schematic view of a positive tab and a negative tab suitable for use in embodiments of the utility model.

Fig. 11 is a schematic view of a positive tab and a negative tab suitable for use in embodiments of the utility model.

Fig. 12 is a schematic view of an explosion structure of a battery according to an embodiment of the present utility model.

Reference numerals:

100-a cover plate assembly; 110-cover plate; 111-positive mounting holes; 112-a negative electrode mounting hole; 120-positive electrode posts; 130-a negative electrode column; 121-a positive electrode column; 122-a first positive electrode fixing portion; 131-a negative electrode column; 132-a first negative electrode fixing portion; 1210-positive electrode tab portion; 1310-a negative electrode flange portion; 1101-first recess; 1102-a second recess; 140-a sealing ring; 150-an insulating plate; 160-positive electrode connecting pieces; 170-a negative electrode connecting piece; 1111-a first positive electrode anti-rotation structure; 1201-a second positive anti-rotation structure; 101-an insulating part; 1121-a first negative electrode anti-rotation structure; 1301-a second negative electrode rotation preventing structure; 180-explosion-proof valve; 190-explosion-proof patch; 200-a housing; 300-cell; 301-positive electrode lugs; 302-negative electrode ear.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the utility model may be combined with other embodiments.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. 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 embodiments of the present utility model, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. In particular, the thickness, length, width, and other dimensions of the various components in the embodiments of the present utility model shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative, and should not be construed as limiting the present utility model in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiments of the present utility model, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

It should be noted that, in the embodiments of the present utility model, the directions or positional relationships indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present utility model and for simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model.

Along with the maturity of manufacturing technology, the battery has wider application prospect in electric vehicles such as electric bicycle, electric automobile, etc. and energy storage container. Power cells are commonly found in the market, and are classified into secondary batteries including lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and lithium batteries, and fuel cells. In the manufacturing process, the battery is manufactured by separately manufacturing the shell and the cover plate, then assembling, injecting liquid and the like after the battery core is filled, and finally the complete battery is formed. The battery cover plate structure is an important ring, the upper part of the battery cover plate structure is provided with a pole column and other components, the battery cover plate structure is used for carrying out liquid injection operation, and in the later use process, a series of performances such as sealing performance, insulating performance and durability of the battery cover plate structure all reach corresponding standards.

The following provides a brief description of terms involved in embodiments of the present utility model.

Creepage distance refers to the shortest path between two conductive parts or between a conductive part and a device protection interface, measured along an insulating surface. I.e. in different use cases, the insulating material exhibits a charging phenomenon as a result of the insulating material around the conductor being electrically polarized. The radius of the charging area (the ring shape when the conductor is round) is the creepage distance. Leakage current paths are formed on the surface of the insulating material. If these leakage current paths form a conductive path, surface flashover or breakdown occurs.

The flanging is a forming method of forming straight walls or flanges with a certain angle along the closed or non-closed curve edge by utilizing the action of a die on a plane part or a curved surface part of a blank. The flanging is a stamping method for turning the outer edge or the hole edge of a blank or a semi-finished product into an upright edge along a certain curve, and can be divided into an extension type flanging and a compression type flanging according to deformation properties.

An embodiment of the utility model provides a cover plate assembly, which can simplify the structure of the cover plate and improve the connection reliability between a pole and the cover plate.

The structure of the cap plate assembly 100 according to the embodiment of the present utility model is described below with reference to fig. 1 to 4.

The cap plate assembly 100 of the present utility model includes: a cover plate 110, a positive electrode column 120 and a negative electrode column 130, wherein a positive electrode mounting hole 111 and a negative electrode mounting hole 112 are formed in the cover plate 110, the positive electrode column 120 is mounted on the positive electrode mounting hole 111, and the negative electrode column 130 is mounted on the negative electrode mounting hole 112; the positive electrode post 120 includes a positive electrode post 121 and a first positive electrode fixing portion 122, and the positive electrode post 121 includes a positive electrode flange portion 1210; the first positive electrode fixing portion 122 and the positive electrode tab portion 1210 extend along a surface direction of the cap plate 110, respectively, to fix the cap plate 110 between the first positive electrode fixing portion 122 and the positive electrode tab portion 1210; wherein the negative electrode post 130 includes a negative electrode post 131 and a first negative electrode fixing portion 132, the negative electrode post 131 including a negative electrode hemming portion 1310; the first negative electrode fixing portion 132 and the negative electrode hemming portion 1310 extend in a surface direction of the cap plate 110, respectively, to fix the cap plate 110 between the first negative electrode fixing portion 132 and the negative electrode hemming portion 1310.

The embodiment of the utility model simplifies the cover plate structure, and improves the suitability and the tightness of the connection between the pole post and the cover plate and the reliability of the battery in the use process by connecting the pole post and the cover plate through the first positive/negative electrode fixing part of the positive/negative electrode and the positive/negative electrode flanging part.

Specifically, the outer circumferential dimensions of the first positive electrode fixing portion 122 and the positive electrode tab portion 1210 may cover the positive electrode mounting hole 111, and the outer circumferential dimensions of the first negative electrode fixing portion 132 and the negative electrode tab portion 1310 may cover the negative electrode mounting hole 112, so as to fix the cap plate 110.

Alternatively, as shown in the cross section of fig. 2, the positive electrode post 121 and the negative electrode post 131 may be of a straight-sided structure before the positive electrode post 120, the negative electrode post 130 are connected with the cap plate 110; or as shown in the cross section of fig. 3, before the positive electrode post 120 and the negative electrode post 130 are connected with the cover plate 110, the positive electrode post 121 and the negative electrode post 131 may be in a pre-flanging structure, wherein the included angle between the flanging angle of the pre-flanging and the plate surface of the cover plate 110 is an acute angle, so that the positioning treatment of the subsequent flanging process is facilitated. The structure and the form of the positive electrode post and the negative electrode post which are not subjected to flanging treatment are not limited to this.

Optionally, before the positive and negative electrode posts 120 and 130 are connected to the cover plate 110, the outer dimension of the positive electrode post 121 is smaller than the hole dimension of the positive electrode mounting hole 111, and the outer dimension of the negative electrode post 131 is smaller than the hole dimension of the negative electrode mounting hole 112, so that the positive and negative electrode posts 120 and 130 are mounted on the cover plate 110. The utility model is applicable to positive pole columns and negative pole columns with various outline dimensions, and is not particularly limited.

Specifically, as shown in the cross section of fig. 4, after the cap plate 110 is connected to the positive electrode post 120 and the negative electrode post 130, the parts of the positive electrode post 121 and the negative electrode post 131 beyond the surface of the cap plate assembly are subjected to a flanging process, the positive electrode flange portion 1210 is obtained by flanging the positive electrode post 121, the negative electrode flange portion 1310 is obtained by flanging the negative electrode post 131, and the cap plate 110 is fixed between the first positive electrode fixing portion 122 and the positive electrode flange portion 1210, and between the first negative electrode fixing portion 132 and the negative electrode flange portion 1310. The sizes of the positive electrode hemming portion and the negative electrode hemming portion are not particularly limited in the present utility model.

In the embodiment of the utility model, before flanging the positive/negative electrode columns, the outer outline size of the positive/negative electrode column is smaller than the hole size of the positive/negative electrode mounting hole, so that the positive/negative electrode columns can be conveniently mounted on the cover plate, the same positive/negative electrode column can be correspondingly mounted on the positive/negative electrode mounting holes of cover plates with different hole sizes, and then the cover plate and the positive/negative electrode columns are fixedly connected through the positive/negative electrode flanging part, so that the positive/negative electrode columns with a single size can be commonly used for the cover plates with different sizes, the suitability of the positive/negative electrode columns is improved, and the reliability of the battery in the use process is improved.

Alternatively, the positive electrode post 120 and the negative electrode post 130 are made of aluminum, copper or a copper-aluminum composite material, which is not particularly limited in the embodiment of the present utility model.

According to the embodiment of the utility model, through the flanging process of the polar column, the connection between the cover plate and the polar column is fixed, so that the sealing performance is improved, the cover plate structure is simplified, the reliability and the sealing performance of the connection between the polar column and the cover plate are improved, and the reliability of the battery in the use process is improved.

In one embodiment of the present utility model, as shown in fig. 7, a first recess 1101 is formed on the surface of the cover plate 110 along the edge of the positive electrode mounting hole 111, a first positive electrode anti-rotation structure 1111 is formed on the side wall of the cover plate 110 connected to the first recess 1101, and a second positive electrode anti-rotation structure 1201 is formed on the side wall of the positive electrode column 121; alternatively, taking fig. 5 as an example, a first concave portion 1101 is provided along the edge of the positive electrode mounting hole 111, a first positive electrode rotation preventing structure 1111 is provided on a side wall connected to the first concave portion 1101 on the surface of the cover plate 110, and the first positive electrode rotation preventing structure 1111 is a flat surface; alternatively, taking fig. 6 as an example, a second positive electrode anti-rotation structure 1201 is disposed on the positive electrode post 120, where the second positive electrode anti-rotation structure 1201 is a flat surface located on the side wall of the positive electrode post 121 on the outer surface of the first positive electrode fixing portion 122. As shown in fig. 7, after the insulating portion is filled into the positive electrode column 120, the insulating portion 101 is filled between the first recess 1101, the first positive electrode anti-rotation structure 1111 and the second positive electrode anti-rotation structure 1201, so that an anti-torsion force is formed between the first positive electrode anti-rotation structure 1111, the second positive electrode anti-rotation structure 1201 and the insulating portion 101, and the torsion strength of the positive electrode column 120 is effectively improved. The surface of the cover plate 110 is provided with a second concave part 1102 along the edge of the negative electrode mounting hole 112, and the side wall of the surface of the cover plate 110 connected with the second concave part 1102 is provided with a first negative electrode anti-rotation structure 1121; a second negative electrode rotation preventing structure 1301 is arranged on the side wall of the negative electrode column body 131; the insulating portion 101 is filled between the second recess 1102, the first negative electrode rotation preventing structure 1121, and the second negative electrode rotation preventing structure 1301. The shapes and structures of the first positive electrode rotation preventing structure 1111, the second positive electrode rotation preventing structure 1201, the first negative electrode rotation preventing structure 1121, and the second negative electrode rotation preventing structure 1301 are not limited thereto.

Optionally, after the connection of the positive/negative electrode column and the cover plate is completed, the insulating portion 101 is filled between the positive/negative electrode column and the cover plate, and the fixing and the insulation of the positive/negative electrode column are completed. In the embodiment of the utility model, the insulating part takes plastic as an example, the fixing and the insulation of the positive/negative pole column are completed by adopting an injection molding process, the injection molding process can adopt a low-pressure injection molding mode or a high-pressure injection molding mode, and the embodiment of the utility model is not particularly limited.

In the art, through the apron turn-ups structure of apron upper surface and utmost point post junction, improve the torsional strength between apron and the utmost point post to improve the yields of apron subassembly and the reliability of battery in the use. However, after the upper surface of the cover plate is turned over, the distance between the cover plate and the upper surface of the pole is obviously shortened, namely the creepage distance reaching the upper surface of the pole along the insulating surface is shortened, the cover plate is easily influenced by external dust or air, the problem of condensation on the surface of the battery cell and the like is caused, and the risk of short circuit is brought.

Specifically, in the embodiment of the present utility model, the creepage distance between the cover plate and the outer part of the pole at least includes the height of the side wall of the insulating part and the distance between the side wall of the insulating part and the upper surface of the pole, as shown by the black bolded distance in fig. 4, the creepage distance between the cover plate and the outer part of the pole is increased, that is, the insulation strength of the surface of the insulating material is increased. Because the dust, condensation and the like on the surface can also form a conductive medium, the influence of the conductive medium can be effectively avoided due to the increase of the creepage distance, and the problems of short circuit and the like caused by penetration inside are also avoided.

In the embodiment of the utility model, the torsional strength of the positive/negative pole is effectively improved and the safety and reliability in the actual use process are improved through the arrangement of the positive/negative pole mounting holes and the positive/negative pole anti-torsion plane and the matched connection among the positive/negative pole mounting holes, the positive/negative pole and the positive/negative pole insulating part. In addition, the design of apron and utmost point post also makes to have suitable creepage distance between apron and the utmost point post, has avoided because of creepage distance is too little leads to short circuit scheduling problem.

In an embodiment of the present utility model, as shown in fig. 8, the cover plate assembly 100 further includes:

the sealing ring 140 is disposed between the positive electrode post 120 and the cap plate 110, and between the negative electrode post 130 and the cap plate 110.

Alternatively, the sealing ring is exemplified by an L-shaped sealing ring, and the vertical wall and the horizontal wall portion of the L-shape of the sealing ring are pressed between the positive/negative electrode post and the positive/negative electrode mounting hole of the cover plate, so that the connecting portion of the cover plate and the positive/negative electrode post has sealing effect in both the horizontal direction and the vertical direction. The sealing ring can also be an O-shaped sealing ring, etc., and the sealing ring material is an electrolyte-resistant rubber sealing ring, a perfluoro ether rubber sealing ring, etc., and the embodiment of the utility model is not particularly limited.

According to the embodiment of the utility model, through the flanging process of the polar column, the connection among the cover plate, the polar column and the sealing ring is fixed, so that the compression stability of the sealing ring is increased, the compression rate of the sealing ring is not reduced due to the softening of the injection molding insulating part, and the safety and reliability of the battery in the use process are improved.

In an embodiment of the present utility model, as shown in fig. 8, the cover plate assembly 100 further includes:

and an insulating plate 150 connected to the cap plate 110 for isolating the battery cell from the cap plate 110 and preventing the battery from being shorted.

After the positive electrode post 120, the negative electrode post 130, and the insulating plate 150 are connected to the cap plate 110, the positive electrode post 121 and the negative electrode post 131 are subjected to a flanging process. After the flanging process, a positive electrode flanging portion 1210 and a negative electrode flanging portion 1310 are obtained, and the insulating plate 150 is positioned between the cover plate 110 and the positive electrode flanging portion 1210 and between the cover plate 110 and the negative electrode flanging portion 1310, and is fixed by the positive electrode flanging portion 1210 and the negative electrode flanging portion 1310.

According to the embodiment of the utility model, the insulating plate is arranged to be connected with the cover plate, so that the battery core and the cover plate can be isolated, short circuit of the battery is prevented, and meanwhile, the insulating plate is fixed through the positive and negative folded edge parts, so that the safety and reliability in the use process are improved.

In an embodiment of the present utility model, the cover plate assembly 100 further includes:

a positive electrode connection piece 160 connected to the positive electrode post 120 for transmitting current;

and a negative electrode connection tab 170 connected to the negative electrode post 130 for transmitting current.

Alternatively, as shown in fig. 9, the positive electrode connection piece 160 is connected to the bottom of the positive electrode post 120 by penetration welding, or the negative electrode connection piece 170 is connected to the bottom of the negative electrode post 130 by penetration welding; or as shown in fig. 10, a boss is arranged at the bottom of the positive electrode column 120, the positive electrode connecting sheet 160 is in seam welding connection with the boss of the positive electrode column 120, or the negative electrode connecting sheet 170 is in seam welding connection with the boss of the negative electrode column 130; or as shown in fig. 11, the positive electrode tab 160 is seam welded to the side wall of the positive electrode folded portion 1210, or the negative electrode tab 170 is seam welded to the side wall of the negative electrode folded portion 1310. The shape, size and connection manner of the positive electrode connection piece 160 and the positive electrode post 120, and/or the shape, size and connection manner of the negative electrode connection piece 170 and the negative electrode post 130 are only used as references, so long as the connection conduction of the positive electrode connection piece 160 and the positive electrode post 120, and the connection conduction of the negative electrode connection piece 170 and the negative electrode post 130 are satisfied, and the embodiment of the utility model is not limited thereto.

Optionally, as shown in fig. 8, the cover plate assembly 100 may further include an explosion-proof valve 180 and an explosion-proof patch 190, wherein an explosion-proof mounting hole is reserved on the cover plate 110, the explosion-proof valve 180 is mounted on the cover plate 110, and then the explosion-proof patch 190 is mounted on the explosion-proof valve 180, so as to ensure the safety and long-term reliability of the cover plate assembly.

The cover plate assembly provided by the embodiment of the utility model has the following advantages:

first: the reliability of connection between the cover plate and the pole is improved, and the safety and reliability in the use process are improved;

second,: the cover plate structure is simplified, and the cover plate cost is saved;

third,: the compression stability of the sealing ring is improved, and the sealing performance of the cover plate assembly is improved;

fourth,: the creepage distance between the pole and the outer part of the cover plate is effectively increased, and the short circuit risk caused by short creepage distance is avoided;

fifth,: the adaptability of the pole is improved, and the single-size pole can be used for common cover plates with different sizes.

The utility model further provides a battery, the cover plate of the battery is simple in structure, reliable in practical process, capable of reducing cost, capable of avoiding risks caused by small flanging creepage distance of the cover plate, and capable of prolonging service life of the battery.

Specifically, as shown in fig. 12, a battery includes a housing 200, a battery cell 300, and the above-mentioned cover plate assembly 100, where the housing 200 has an installation cavity, the battery cell 300 is disposed in the installation cavity, the cover plate assembly 100 is covered at an opening of the installation cavity, and the battery cell 300 includes a positive electrode tab 301 and a negative electrode tab 302.

The battery 300 is located in the housing 200 and includes a first electrode and a second electrode with opposite polarities, for example, the first electrode is a positive electrode and the second electrode is a negative electrode. The first electrode and the second electrode each include a coated portion and an uncoated portion, the uncoated portion is located at an end of the coated region along the length direction of the battery cell 300, and forms a tab, the positive electrode corresponds to the positive tab 301, and the negative electrode corresponds to the negative tab 302. The cap assembly is disposed over the battery cell 300 and closes the opening of the case 200. The positive electrode lug 301 of the battery cell 300 is connected with the positive electrode connecting sheet 160, and the positive electrode lug 301 is indirectly and electrically connected with the positive electrode post 120 through the positive electrode connecting piece 160; the negative electrode tab 302 of the cell 300 is connected to the surface of the negative electrode tab 170, and the negative electrode tab 302 is indirectly electrically connected to the negative electrode post 130 through the negative electrode tab 170. The shapes and sizes of the positive electrode tab 301 and the negative electrode tab 302 may meet the actual electrical connection requirements, and the embodiment of the present utility model is not particularly limited.

The battery provided by the embodiment can simplify the cover plate structure, improve the reliability and the tightness of connection between the pole and the cover plate, and improve the reliability of the battery in the use process.

Specifically, in various embodiments of the present utility model, the sequence number of each process does not mean that the execution sequence of each process is determined by the function and the internal logic, and should not limit the implementation process of the embodiments of the present utility model.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (11)

1. A battery, comprising:

the battery cell is arranged in the mounting cavity, and the cover plate assembly is covered at the opening of the mounting cavity;

the cover plate assembly includes: the cover plate is provided with a positive electrode mounting hole and a negative electrode mounting hole; the positive pole is arranged in the positive pole mounting hole; a negative electrode post mounted in the negative electrode mounting hole;

the battery cell comprises a positive electrode lug and a negative electrode lug, wherein the positive electrode lug is connected with the positive electrode post, and the negative electrode lug is connected with the negative electrode post;

the positive pole comprises a positive pole body and a first positive pole fixing part, and the positive pole body comprises a positive pole flanging part; the first positive electrode fixing portion and the positive electrode flanging portion extend along the surface direction of the cover plate respectively so as to fix the cover plate between the first positive electrode fixing portion and the positive electrode flanging portion;

the negative pole column comprises a negative pole column body and a first negative pole fixing part, and the negative pole column body comprises a negative pole flanging part; the first negative electrode fixing portion and the negative electrode hemming portion extend along a surface direction of the cap plate, respectively, to fix the cap plate between the first negative electrode fixing portion and the negative electrode hemming portion.

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the positive electrode flanging part is formed by flanging the positive electrode column outwards; and/or

The negative electrode flanging part is formed by flanging the negative electrode column body outwards.

3. The battery according to claim 2, wherein the positive electrode post includes a straight-sided structure or a pre-hemmed structure, the positive electrode hemmed portion being formed by bending the straight-sided structure or the pre-hemmed structure of the positive electrode post;

and/or the negative electrode column body comprises a straight edge structure or a pre-flanging structure, and the negative electrode flanging part is formed by bending the straight edge structure or the pre-flanging structure of the negative electrode column body.

4. The battery according to claim 1, wherein the cover plate is provided with a first concave portion along the edge of the positive electrode mounting hole, a first positive electrode rotation preventing structure is arranged on the side wall, connected with the first concave portion, of the surface of the cover plate, a second positive electrode rotation preventing structure is arranged on the side wall of the positive electrode column, and an insulating portion is filled among the first concave portion, the first positive electrode rotation preventing structure and the second positive electrode rotation preventing structure; and/or

The cover plate is provided with a second concave part along the edge of the negative electrode mounting hole, a first negative electrode rotation preventing structure is arranged on the side wall, connected with the second concave part, of the cover plate surface, a second negative electrode rotation preventing structure is arranged on the side wall of the negative electrode column body, and an insulating part is filled between the second concave part, the first negative electrode rotation preventing structure and the second negative electrode rotation preventing structure.

5. The battery of claim 1, wherein the battery further comprises:

and the sealing ring is arranged between the positive pole and the cover plate and/or between the negative pole and the cover plate.

6. The battery of claim 1, wherein the battery further comprises:

an insulating plate disposed between the cap plate and the positive electrode hemming portion, and between the cap plate and the negative electrode hemming portion; the insulating plate is fixed by the positive electrode flange portion and the negative electrode flange portion.

7. The battery according to any one of claims 1 to 6, characterized in that the battery further comprises:

the positive electrode connecting sheet is connected with the positive electrode post; and/or

And the negative electrode connecting piece is connected with the negative electrode column.

8. The battery of claim 7, wherein the battery is configured to provide the battery with a battery cell,

the positive electrode connecting piece is connected with the positive electrode post in a penetrating welding way, or the positive electrode connecting piece is connected with the positive electrode post in a seam welding way, or the positive electrode connecting piece is connected with the side wall of the positive electrode flanging part of the positive electrode post in a seam welding way; and/or

The negative electrode connecting piece is connected with the negative electrode column in a penetrating way, or the negative electrode connecting piece is connected with the negative electrode column in a seam welding way, or the negative electrode connecting piece is connected with the side wall of the negative electrode flanging part of the negative electrode column in a seam welding way.

9. The battery according to claim 7, wherein the positive electrode connection piece is connected to the positive electrode tab such that the positive electrode tab is connected to the positive electrode post through the positive electrode connection piece; and/or

The second surface of the negative electrode connecting sheet is connected with the negative electrode lug, so that the negative electrode lug is connected with the negative electrode post through the negative electrode connecting sheet.

10. The battery according to any one of claims 1 to 6, characterized in that the battery further comprises:

the explosion-proof valve is arranged on the inner surface of the cover plate;

and the explosion-proof patch is arranged on the outer surface of the cover plate and is attached to the explosion-proof valve.

11. A cover plate assembly, comprising:

the cover plate is provided with a positive electrode mounting hole and a negative electrode mounting hole;

the positive pole is arranged in the positive pole mounting hole;

a negative electrode post mounted in the negative electrode mounting hole;

the positive pole comprises a positive pole body and a first positive pole fixing part, and the positive pole body comprises a positive pole flanging part; the first positive electrode fixing portion and the positive electrode flanging portion extend along the surface direction of the cover plate respectively so as to fix the cover plate between the first positive electrode fixing portion and the positive electrode flanging portion;

the negative pole column comprises a negative pole column body and a first negative pole fixing part, and the negative pole column body comprises a negative pole flanging part; the first negative electrode fixing portion and the negative electrode hemming portion extend along a surface direction of the cap plate, respectively, to fix the cap plate between the first negative electrode fixing portion and the negative electrode hemming portion.