CN219303796U

CN219303796U - Cover plate assembly of power battery and power battery thereof

Info

Publication number: CN219303796U
Application number: CN202223180187.7U
Authority: CN
Inventors: 单晓浩; 杨慧敏; 张亮; 袁文静; 张伯都; 孙长春
Original assignee: Bluepark System Branch Of Baic New Energy Motor Co ltd; Beijing Electric Vehicle Co Ltd
Current assignee: Bluepark System Branch Of Baic New Energy Motor Co ltd; Beijing Electric Vehicle Co Ltd
Priority date: 2022-06-20
Filing date: 2022-11-26
Publication date: 2023-07-04
Anticipated expiration: 2032-11-26
Also published as: CN219180628U; CN219180634U; CN219180630U; CN219180631U; CN115775951A; CN219180633U; CN219180632U; CN219180629U; CN219180635U

Abstract

The utility model discloses a cover plate component of a power battery and the power battery thereof, the cover plate component of the power battery comprises: the cover plate is provided with a mounting hole and is provided with an inner side end close to the battery cell; the battery cell pole post is arranged on the mounting hole in a penetrating way; the battery cell connecting piece, the battery cell connecting piece includes first connecting plate and second connecting plate, and first connecting plate is established on the inboard end, and connects the battery cell utmost point post, and first connecting plate is connected to the second connecting plate, is equipped with the junction surface on the second connecting plate, and the junction surface perpendicular to apron just is used for laminating and links to each other with the utmost point ear. The cover plate component of the power battery can improve the space utilization rate between the electrode lugs and the cover plate, reduce the material quantity, and improve the energy density and the safety performance of the battery core.

Description

Cover plate assembly of power battery and power battery thereof

Cross Reference to Related Applications

The present application claims priority from chinese patent application No. 202221547710.2 entitled "power battery cover and battery" filed by beijing new energy automobile, blue valley power system division, 2022, 6 and 20, the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

At present, square power battery cell is homonymy pole form usually, and inside pole core only has the displacement tendency of perpendicular to top cap direction in the casing to lead to the utmost point ear to need bend, consequently need reserve great size between utmost point ear and the apron, extravagant effective space reduces electric core energy density. The above problems are more prominent for the square battery cells with large-sized double-side outlet poles.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an objective of the present utility model is to provide a cover plate assembly of a power battery, so as to solve the problems of reserving a larger size between a tab and a cover plate, wasting effective space, and reducing energy density of a battery cell in the prior art.

The utility model also aims to provide a power battery, so as to apply the cover plate assembly of the power battery.

A cover assembly of a power cell according to an embodiment of the present utility model includes: the cover plate is provided with a mounting hole, and the cover plate is provided with an inner side end close to the battery cell; the battery core electrode post is arranged on the mounting hole in a penetrating way; the battery cell connecting piece, the battery cell connecting piece includes first connecting plate and second connecting plate, first connecting plate is established on the inboard end, and connect the battery cell utmost point post, the second connecting plate is connected first connecting plate, be equipped with the junction surface on the second connecting plate, the junction surface perpendicular to the apron, and be used for laminating and link to each other with the utmost point ear.

According to the cover plate assembly of the power battery, the first connecting plate is arranged at the inner side end of the cover plate and is connected with the battery core polar column, the second connecting plate is connected with the first connecting plate, meanwhile, the second connecting plate is provided with the connecting surface which is perpendicular to the cover plate and is used for being attached to and connected with the polar lugs, so that the space utilization rate between the polar lugs and the cover plate can be improved, the material quantity is reduced, and the energy density and the safety performance of the battery core are improved.

In some embodiments, the first connection plate and the second connection plate are welded or integrally formed.

In some embodiments, the first connecting plate is provided with an assembly hole, and the periphery of the assembly hole is welded and connected with the electric core pole.

In some embodiments, the first connection plate is perpendicular to the second connection plate.

In some embodiments, the second connection plate is disposed at the center of the first connection plate, or the second connection plate is disposed near the center of the first connection plate.

In some embodiments, the cover assembly of the power cell further comprises: the plastic part, the inside of plastic part is formed with the cavity, the plastic part has the intercommunication the uncovered and the utmost point ear mounting hole of cavity, the plastic part has to connect the first tip of apron, uncovered is established on the first tip, first connecting plate with the second connecting plate is located in the cavity.

In some embodiments, the plastic member has a second end portion far away from the cover plate, the second end portion is bent in a direction approaching the cavity, and the tab mounting hole is provided at a center of the bent portion of the second end portion.

In some embodiments, the plastic part comprises: the first part is provided with a first groove and a first clamping part; the second part is provided with a second groove and a second clamping part, the second groove and the first groove jointly define the cavity and the opening, and the second clamping part is connected with the first clamping part in a clamping way.

According to an embodiment of the present utility model, a power battery includes: the cover plate component and the electrode lugs of the power battery are attached to and connected with the connecting surface. Thereby, the energy density and the safety performance of the power battery are improved.

In some embodiments, the cover plate assembly further comprises a plastic part, a cavity is formed in the plastic part, the plastic part is provided with an opening and a lug mounting hole, the opening is communicated with the cavity, the plastic part is provided with a first end part connected with the cover plate, the opening is formed in the first end part, and the first connecting plate and the second connecting plate are located in the cavity; the tab includes main part and connecting portion that link to each other, connecting portion wears to establish on the tab mounting hole and with the junction surface links to each other, main part has perpendicular to the thickness direction of junction surface, main part is in the size of thickness direction is followed keep away from connecting portion's direction increases gradually.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of a cover assembly of a power cell in an embodiment of the utility model;

FIG. 2 is a schematic structural view of a cover assembly of a power cell in an embodiment of the utility model;

fig. 3 is a schematic diagram of a power cell in an embodiment of the utility model.

Reference numerals:

100. a cover plate assembly of the power battery;

10. a cover plate; 101. a mounting hole; 102. an inner end;

20. a cell pole;

30. a cell connector; 301. a first connection plate; 302. a second connecting plate; 3021. a connection surface;

40. a plastic part; 401. a first portion; 4011. a first groove; 402. a second portion; 4021. a second groove; 403. a second end; 403a, tab mounting holes;

1000. a power battery;

200. a tab; 201. a main body portion; 202. a connection part; 300. and a battery cell.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements 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, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically 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 will be understood in specific cases by those of ordinary skill in the art.

Referring now to fig. 1-2, a cover plate assembly 100 of a power cell 1000 according to an embodiment of the present utility model is described.

As shown in fig. 1, a cap plate assembly 100 of a power battery 1000 according to an embodiment of the present utility model includes: cover plate 10, cell terminal 20 and cell connector 30.

The cover plate 10 is provided with a mounting hole 101, and the cover plate 10 is provided with an inner side end 102 close to the battery cell 300; the cell pole 20 is arranged on the mounting hole 101 in a penetrating way; the cell connector 30 includes a first connecting plate 301 and a second connecting plate 302, the first connecting plate 301 is disposed on the inner end 102 and is connected to the cell post 20, the second connecting plate 302 is connected to the first connecting plate 301, a connecting surface 3021 is disposed on the second connecting plate 302, and the connecting surface 3021 is perpendicular to the cover plate 10 and is used for attaching to and connecting with the tab 200.

It can be understood that, in the prior art, the cell connector 30 of the cover plate assembly 100 has a flat plate structure, and the tab needs to be bent and a longer dimension needs to be reserved between the tab and the cover plate during assembling the tab and the connector, which reduces the space utilization and causes waste of materials. The battery core connecting piece 30 of the application is of a non-flat plate structure, and comprises a first connecting plate 301 and a second connecting plate 302, the first connecting plate 301 is connected with the battery core pole 20, the second connecting plate 302 is connected with the first connecting plate 301, meanwhile, the surface of the tab 200 is directly attached to the surface of the second connecting plate 302, bending is not needed, accordingly, longer size is not needed to be reserved between the tab 200 and the cover plate 10, the use of materials is saved, and the space utilization rate is improved.

The materials of the first connection plate 301 and the second connection plate 302 are not particularly limited, and those skilled in the art can select materials according to the need, for example, aluminum materials and copper materials.

According to the cover plate assembly 100 of the power battery 1000 of the embodiment of the utility model, the first connecting plate 301 is arranged on the inner side end 102 of the cover plate 10 and is connected with the battery core polar column 20, the second connecting plate 302 is connected with the first connecting plate 301, meanwhile, the second connecting plate 302 is provided with the connecting surface 3021, and the connecting surface 3021 is perpendicular to the cover plate 10 and is used for being attached to and connected with the polar lug 200, so that the space utilization rate can be improved, the material quantity can be reduced, and the energy density and the safety performance of the battery core 300 can be improved.

In some embodiments, the first connection plate 301 and the second connection plate 302 are welded together. It can be understood that the second connecting plate 302 can be welded on the first connecting plate 301, and the two connecting plates are convenient to connect and have high connection strength.

In another embodiment, the first connection plate 301 and the second connection plate 302 are integrally formed. It can be understood that the first connection plate 301 and the second connection plate 302 can be integrally formed through a process, so as to shorten the manufacturing time and improve the efficiency, and meanwhile, the strength of the formed cell connector 30 is higher.

In some embodiments, the first connecting plate 301 is provided with a mounting hole (not shown in the figure), and the periphery of the mounting hole is welded to the electrical core terminal 20. It will be appreciated that the first connection plate 301 is provided with a fitting hole in advance, so that one end of the battery terminal 20 is fitted into the fitting hole. The first connection plate 301 is further fixed in the assembly hole by welding, so that connection is firm. The fitting hole is preferably provided at the center of the first connection plate 301.

In some embodiments, referring to fig. 1-2, the first connecting plate 301 is perpendicular to the second connecting plate 302, so that the connection between the two plates is firm, and the material consumption can be reduced.

In some embodiments, referring to fig. 1-2, the second connection plate 302 is provided at the center of the first connection plate 301. It can be understood that the first connection plate 301 is a rectangular plate, the width direction of the first connection plate 301 is an up-down direction, and the second connection plate 302 is disposed on the central axis of the width direction of the first connection plate 301.

In another embodiment, the second connection plate 302 is disposed near the center of the first connection plate 301. It will be understood that, referring to fig. 1-2, the width direction of the first connection plate 301 is the front-rear direction, and the second connection plate 302 may be disposed near the central axis of the width direction of the first connection plate 301.

In some embodiments, the cover assembly 100 of the power battery 1000 further includes a plastic member 40, wherein a cavity is formed in the plastic member 40, the plastic member 40 has an opening and a tab mounting hole 403a that are communicated with the cavity, the plastic member 40 has a first end portion connected to the cover 10, the opening is disposed on the first end portion, and the first connection plate 301 and the second connection plate 302 are located in the cavity. It can be understood that in the prior art, the battery cell belongs to an interference fit mode in the shell, but the battery cell still generates displacement when jolting to a large extent occurs, and the battery cell is short-circuited due to the damage of the diaphragm possibly caused when the battery cell is severe, so that the safety problem is caused. This application establishes the second connecting plate 302 in the cavity through setting up plastic part 40 to be equipped with utmost point ear mounting hole 403a on plastic part 40, the one end of utmost point ear 200 links to each other with the second connecting plate 302 through utmost point ear mounting hole 403a, and the other end of utmost point ear 200 is connected with electric core 300 simultaneously, thereby restriction electric core 300 position, protection electric core 300 prevents the potential safety risk that utmost point ear 200 caused because of being extruded simultaneously.

In some embodiments, referring to fig. 1, the plastic member 40 has a second end 403 far from the cover plate 10, the second end 403 is bent in a direction approaching the cavity, and the tab mounting hole 403a is provided at the center of the bent portion of the second end 403. It will be appreciated that the portion of the tab 200 that interconnects with the second connection plate 302 is located within the cavity of the plastic part 40, and the remaining portion is located outside the cavity. Through the side, far away from the cover plate 10, of the plastic piece 40 is bent inwards in the cavity, and the lug mounting hole 403a is formed in the center of the bent portion, so that the lug 200 is buffered when being contacted with the lug mounting hole 403a, and meanwhile, the limiting effect on the battery cell 300 is achieved.

In some embodiments, referring to fig. 1, the plastic part 40 includes a first portion 401 and a second portion 402, where a first groove 4011 and a first clamping portion are disposed on the first portion 401; the second portion 402 is provided with a second groove 4021 and a second clamping portion, where the second groove 4021 and the first groove 4011 define a cavity and an opening together, and the second clamping portion is connected to the first clamping portion in a clamping manner. It can be understood that the plastic member 40 has a symmetrical structure, and a tab mounting hole 403a is formed between the symmetrical first portion 401 and second portion 402, so that the tab 200 can pass through the tab mounting hole 403a to connect with the second connection plate 302.

One embodiment of the cover plate assembly 100 of the power cell 1000 of the present utility model is described below with reference to the accompanying drawings.

Referring to fig. 1-2, a cover assembly 100 of a power cell 1000 includes: cover plate 10, electric core post 20, electric core connecting piece 30 and plastic piece 40.

The cover plate 10 is provided with a mounting hole 101, and the cover plate 10 is provided with an inner side end 102 close to the battery cell 300; the cell pole 20 is arranged on the mounting hole 101 in a penetrating way; the cell connector 30 includes a first connecting plate 301 and a second connecting plate 302, the first connecting plate 301 is disposed on the inner end 102 and is connected to the cell post 20, the second connecting plate 302 is connected to the first connecting plate 301, a connecting surface 3021 is disposed on the second connecting plate 302, and the connecting surface 3021 is perpendicular to the cover plate 10 and is used for attaching to and connecting with the tab 200. The plastic member 40 has a cavity formed therein, the plastic member 40 has an opening communicating with the cavity and a tab mounting hole 403a, the plastic member 40 has a first end portion connected to the cover plate 10, the opening is formed on the first end portion, and the first connection plate 301 and the second connection plate 302 are located in the cavity.

The first connection plate 301 and the second connection plate 302 are welded to each other. The first connecting plate 301 is provided with an assembly hole, and the periphery of the assembly hole is welded and connected with the battery core pole 20. The first connection plate 301 is perpendicular to the second connection plate 302. The second connection plate 302 is provided at the center of the first connection plate 301.

The plastic member 40 has a second end 403 remote from the cover plate 10, the second end 403 is bent in a direction approaching the cavity, and a tab mounting hole 403a is provided at the center of the bent portion of the second end 403. The plastic part 40 comprises a first part 401 and a second part 402, wherein a first groove 4011 and a first clamping part are arranged on the first part 401; the second portion 402 is provided with a second groove 4021 and a second clamping portion, where the second groove 4021 and the first groove 4011 define a cavity and an opening together, and the second clamping portion is connected to the first clamping portion in a clamping manner.

According to the power battery 1000 of the embodiment of the present utility model, referring to fig. 3, the cover plate assembly 100 and the tab 200 of the power battery 1000 are included, and the tab 200 is attached to and connected with the connection surface 3021.

In some embodiments, the cover assembly 100 further includes a plastic member 40, a cavity is formed in the plastic member 40, the plastic member 40 has an opening and a tab mounting hole 403a that are communicated with the cavity, the plastic member 40 has a first end portion connected to the cover 10, the opening is disposed on the first end portion, and the first connection plate 301 and the second connection plate 302 are located in the cavity; the tab 200 includes a main body portion 201 and a connection portion 202 connected to each other, the connection portion 202 being provided to pass through the tab mounting hole 403a and connected to the connection face 3021, the main body portion 201 having a thickness direction perpendicular to the connection face 3021, and a dimension of the main body portion 201 in the thickness direction gradually increasing in a direction away from the connection portion 202. Thereby, the energy density and the safety performance of the power battery 1000 are improved.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover assembly for a power cell, comprising:

the cover plate is provided with a mounting hole, and the cover plate is provided with an inner side end close to the battery cell;

the battery core electrode post is arranged on the mounting hole in a penetrating way;

the battery cell connecting piece, the battery cell connecting piece includes first connecting plate and second connecting plate, first connecting plate is established on the inboard end, and connect the battery cell utmost point post, the second connecting plate is connected first connecting plate, be equipped with the junction surface on the second connecting plate, the junction surface perpendicular to the apron, and be used for laminating and link to each other with the utmost point ear.

2. The cover assembly of claim 1, wherein the first and second connection plates are welded or integrally formed.

3. The cover plate assembly of claim 1, wherein the first connecting plate is provided with an assembly hole, and the periphery of the assembly hole is welded and connected with the cell terminal.

4. The cover assembly of a power cell of claim 1, wherein the first connection plate is perpendicular to the second connection plate.

5. The cover plate assembly of claim 1, wherein the second connection plate is disposed at a center of the first connection plate or is disposed near a center of the first connection plate.

6. The cover assembly of a power cell of claim 1, further comprising:

the plastic part, the inside of plastic part is formed with the cavity, the plastic part has the intercommunication the uncovered and the utmost point ear mounting hole of cavity, the plastic part has to connect the first tip of apron, uncovered is established on the first tip, first connecting plate with the second connecting plate is located in the cavity.

7. The cover plate assembly of claim 6, wherein the plastic member has a second end portion remote from the cover plate, the second end portion being bent in a direction approaching the cavity, the tab mounting hole being provided at a center of a bent portion of the second end portion.

8. The cover assembly of a power cell of claim 6, wherein the plastic piece comprises:

the first part is provided with a first groove and a first clamping part;

the second part is provided with a second groove and a second clamping part, the second groove and the first groove jointly define the cavity and the opening, and the second clamping part is connected with the first clamping part in a clamping way.

9. A power cell, comprising:

the cover assembly of a power cell of any one of claims 1 to 8;

and the electrode lugs are attached to and connected with the connecting surface.

10. The power cell of claim 9, wherein the cover plate assembly further comprises a plastic piece having a cavity formed therein, the plastic piece having an opening communicating with the cavity and a tab mounting hole, the plastic piece having a first end portion to which the cover plate is attached, the opening being provided on the first end portion, the first and second connection plates being located within the cavity;

the tab includes main part and connecting portion that link to each other, connecting portion wears to establish on the tab mounting hole and with the junction surface links to each other, main part has perpendicular to the thickness direction of junction surface, main part is in the size of thickness direction is followed keep away from connecting portion's direction increases gradually.