CN218919244U

CN218919244U - Battery cell, battery and vehicle

Info

Publication number: CN218919244U
Application number: CN202222407545.7U
Authority: CN
Inventors: 夏天军; 闫怀雷; 何畅
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-04-25
Anticipated expiration: 2032-09-09

Abstract

The utility model discloses a battery monomer, a battery and a vehicle, wherein the battery monomer comprises: a housing defining a mounting cavity open at one end; an electrode assembly disposed within the mounting cavity; the cover plate is connected with the shell and is used for sealing the open end of the mounting cavity; and the insulating film is arranged in the mounting cavity and wraps the electrode assembly, and part of the structure of the insulating film forms a supporting part to be supported between the bottom wall of the mounting cavity and the electrode assembly. The battery cell has the advantages of improving the assembly efficiency of the battery cell, reducing the cost and simultaneously preventing the occurrence of short circuit risk.

Description

Battery cell, battery and vehicle

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery cell, a battery and a vehicle.

Background

In the related art, in the existing battery cell structure, the bottom support plate is an important component in the structure. The bottom support plate is used for supporting the electrode assembly and preventing the electrode assembly from interfering with the bottom R angle of the shell.

In the prior art, the mylar film is generally wrapped with the electrode assembly after being hot-melted with the bottom supporting plate to prevent the electrode assembly from being contacted with the shell, however, in the assembly process, the mylar film and the bottom supporting plate are required to be hot-melted by depending on equipment positioning, and then the electrode group is wrapped, so that the operation is relatively complex, the assembly efficiency of the battery is single, and the cost is high.

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 battery cell to solve the problems of complex operation, low efficiency and high cost in the prior art when the battery cell is assembled.

The utility model also aims to provide a battery for applying the battery cell.

The utility model also aims to provide a vehicle for applying the battery.

According to an embodiment of the present utility model, a battery cell includes: a housing defining a mounting cavity open at one end; the electrode assembly is arranged in the mounting cavity; the cover plate is connected with the shell and used for sealing the open end of the mounting cavity; and the insulating film is arranged in the mounting cavity and wraps the electrode assembly, and part of the insulating film forms a supporting part to be supported between the bottom wall of the mounting cavity and the electrode assembly.

According to the battery cell provided by the embodiment of the utility model, the insulating film is arranged in the mounting cavity and wraps the electrode assembly, and the supporting part is formed by the partial structure of the insulating film so as to be supported between the bottom wall and the electrode assembly, so that the use of a bottom supporting plate is avoided, the efficiency is improved, the cost is saved, and the short circuit risk is prevented.

In addition, the battery cell according to the above embodiment of the present utility model may have the following additional technical features:

in some embodiments of the present utility model, the insulating film includes a first film body that wraps the electrode assembly, and a second film body configured as the support portion and provided between a bottom wall of the mounting cavity and the electrode assembly.

In some embodiments of the utility model, the second film body is folded to form the support.

In some embodiments of the present utility model, the support part includes a plurality of sub-support parts, and the plurality of sub-support parts are sequentially stacked in a depth direction of the mounting cavity.

In some embodiments of the present utility model, the height of the supporting portion is H, which satisfies the relation: h is more than or equal to 0.3mm and less than or equal to 0.5mm.

In some embodiments of the utility model, the forward projection of the electrode assembly is located within the forward projection of the support portion along the depth of the mounting cavity.

In some embodiments of the utility model, the first film body and the second film body are integrally formed.

In some embodiments of the utility model, the insulating film is a Mylar film.

The battery according to the embodiment of the utility model comprises the battery cell. Thereby, the cost of the battery is reduced.

The vehicle according to the embodiment of the utility model comprises the battery. Thereby, the cost of the vehicle is reduced.

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 view of a battery cell structure according to an embodiment of the present utility model;

fig. 2 is an enlarged view of the portion I in fig. 1.

Reference numerals:

100. a battery cell;

10. a housing;

20. an electrode assembly;

30. a cover plate;

40. an insulating film; 401. a first film body; 402. a second film body; 403. a support part; 4031. a sub-support.

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 to fig. 1 to 2, a battery cell 100 according to an embodiment of the present utility model is described below.

As shown in fig. 1, a battery cell 100 according to an embodiment of the present utility model includes: the case 10, the electrode assembly 20, the cap plate 30, and the insulating film 40.

The housing 10 defines a mounting cavity open at one end; the electrode assembly 20 is disposed within a mounting cavity (not shown); the cover plate 30 is connected with the housing 10 and is used for sealing the open end of the mounting cavity, and further, the cover plate 30 is welded with the housing 10; the insulating film 40 is disposed in the mounting cavity and surrounds the electrode assembly 20, the insulating film 40 is wrapped outside the electrode assembly 20, and a portion of the insulating film 40 is structured to form a supporting portion 403 to be supported between the bottom wall of the mounting cavity and the electrode assembly 20.

It will be appreciated that the housing 10 is a three-dimensional structure having a mounting cavity therein and an open end, i.e., the housing 10 is hollow. Specifically, it may be a hollow rectangular parallelepiped structure. The electrode assembly 20 is installed in the installation cavity along the opening of the installation cavity, meanwhile, the electrode assembly 20 is wrapped by the insulating film 40, the supporting portion 403 is formed after the insulating film 40 is folded for multiple times to support the electrode assembly 20, the supporting portion 403 is equivalent to a bottom supporting plate in the prior art, the supporting effect can be achieved, the insulating effect can also be achieved, the insulating film and the bottom supporting plate in the prior art are prevented from being subjected to positioning and remelting by means of equipment, and then the complex process of the electrode assembly is wrapped, so that the assembly efficiency of the battery cell 100 is improved, the cost of the battery cell 100 is reduced, and the risk of short circuit is prevented. It should be noted that, the electrode assembly 20 is a structure formed by stacking a plurality of electric cells, which belongs to a conventional structure in the art, and will not be described herein.

According to the battery cell 100 of the embodiment of the utility model, the insulating film 40 is provided in the mounting cavity and wraps the electrode assembly 20, and the supporting part 403 is formed by forming part of the structure of the insulating film 40 to be supported between the bottom wall and the electrode assembly 20, so that the use of a bottom plate is avoided, the efficiency is improved, and the cost is saved.

In some embodiments, as shown in fig. 2, the insulating film 40 includes a first film body 401 and a second film body 402, the first film body 401 wrapping the electrode assembly 20, the second film body 402 being configured as a support 403 and disposed between the bottom wall of the mounting cavity and the electrode assembly 20. It can be understood that the first film body 401 is wrapped on the outer surface of the electrode assembly 20, so that the case 10 is effectively prevented from directly contacting the electrode assembly 20, and the battery cell 100 has a good insulating property; at the same time, the second film body 402 forms a support part 403 corresponding to a bottom plate of the related art battery cell, and the support part 403 serves to support the electrode assembly 20 and to prevent a short circuit problem.

In some embodiments, as shown in fig. 2, the second film body 402 is folded to form a support 403. It can be understood that the second film body 402 is formed with the supporting portion 403 having a supporting effect by being folded a plurality of times. The number of times of folding is not particularly limited, and may be, for example, 2 times, 3 times, 4 times, or 5 times, and the number of times of folding the second film main body 402 may be folded according to actual needs.

In some embodiments, as shown in fig. 2, the support portion 403 includes a plurality of sub-support portions 4031, and the plurality of sub-support portions 4031 are stacked in order along the depth direction of the mounting cavity. It can be understood that the supporting portion 403 is formed by folding the second film main body 402, and a plurality of sub supporting portions 4031 are formed after folding, so as to enhance the supporting effect.

In some embodiments, the height of the supporting portion 403 is H, which satisfies the relationship: h is more than or equal to 0.3mm and less than or equal to 0.5mm. It is understood that if the height of the supporting portion 403 is too high, the performance of the battery cell 100 is degraded, and if the height of the supporting portion 403 is too low, the supporting function is not achieved. The height H of the support portion 403 may be any value within a range of 0.3mm to 0.5mm, and for example, H may be 0.3mm, 0.4mm, or 0.5mm.

In some embodiments, the front projection of the electrode assembly 20 is located within the front projection range of the support 403 along the depth direction of the mounting cavity. It is understood that the support portion 403 may support the entire surface of the electrode assembly 20 near the bottom wall of the case 10, thereby serving as a good support.

In some embodiments, the first membrane body 401 and the second membrane body 402 are integrally formed. After the first film main body 401 and the second film main body 402 are integrally formed, the formed insulating film 40 is more stable in structure. It should be noted that the integral molding process belongs to the conventional technology, and is not described here again.

In some embodiments, the insulating film 40 is a Mylar film. It can be understood that the Mylar film is a polyester polymer and has good mechanical flexibility and insulativity, so that the Mylar film can play a supporting role and can play a good insulating role.

One embodiment of the battery cell 100 of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the battery cell 100 includes: the case 10, the electrode assembly 20, the cap plate 30, and the insulating film 40.

The housing 10 defines a mounting cavity open at one end; the electrode assembly 20 is arranged in the mounting cavity, and the electrode assembly 20 is provided with a positive electrode lug and a negative electrode lug; the cover plate 30 is connected with the shell 10 and is used for sealing the open end of the mounting cavity, the cover plate 30 is provided with a positive pole and a negative pole, the positive pole is connected with a positive lug, and the negative pole is connected with a negative lug; the insulating film 40 is provided in the mounting cavity and surrounds the electrode assembly 20, the insulating film 40 is a Mylar film, and a part of the structure of the insulating film 40 forms a supporting portion 403 to be supported between the bottom wall of the mounting cavity and the electrode assembly 20.

The insulating film 40 includes a first film body 401 and a second film body 402, the first film body 401 wrapping the electrode assembly 20, the second film body 402 being configured as a support portion 403 and being provided between the bottom wall of the mounting cavity and the electrode assembly 20.

The second film body 402 is folded to form a support 403. The support portion 403 includes 3 sub-support portions 4031,3 sub-support portions 4031 which are stacked in order in the depth direction of the mounting cavity. The height of the support 403 is 0.4mm.

The front projection of the electrode assembly 20 is located within the front projection range of the support 403 in the depth direction of the mounting cavity. The first film body 401 and the second film body 402 are integrally formed.

The battery according to the embodiment of the utility model includes the above-described battery cell 100. Thereby, the cost of the battery is reduced.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," 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 battery cell, comprising:

a housing (10), the housing (10) defining a mounting cavity open at one end;

an electrode assembly (20), the electrode assembly (20) being disposed within the mounting cavity;

a cover plate (30), the cover plate (30) being connected to the housing (10) and being used for sealing the open end of the mounting cavity;

and an insulating film (40), wherein the insulating film (40) is arranged in the mounting cavity and wraps the electrode assembly (20), and a part of the insulating film (40) is structurally formed into a supporting part (403) so as to be supported between the bottom wall of the mounting cavity and the electrode assembly (20).

2. The battery cell according to claim 1, wherein the insulating film (40) includes a first film body (401) and a second film body (402), the first film body (401) wrapping the electrode assembly (20), the second film body (402) being configured as the support portion (403) and being provided between a bottom wall of the mounting cavity and the electrode assembly (20).

3. The battery cell according to claim 2, wherein the second film body (402) is folded to form the support portion (403).

4. A battery cell according to claim 3, wherein the support portion (403) includes a plurality of sub-support portions (4031), the plurality of sub-support portions (4031) being stacked in order along a depth direction of the mounting cavity.

5. The battery cell according to claim 1, wherein the height of the support portion (403) is H, satisfying the relation: h is more than or equal to 0.3mm and less than or equal to 0.5mm.

6. The battery cell according to claim 1, wherein an orthographic projection of the electrode assembly (20) is located within an orthographic projection range of the support portion (403) in a depth direction of the mounting cavity.

7. The battery cell of claim 2, wherein the first membrane body (401) and the second membrane body (402) are integrally formed.

8. The battery cell according to any one of claims 1-7, wherein the insulating film (40) is a Mylar film.

9. A battery comprising a battery cell according to any one of claims 1-8.

10. A vehicle comprising the battery according to claim 9.