CN220086195U

CN220086195U - Battery shell, battery and power utilization device with battery shell

Info

Publication number: CN220086195U
Application number: CN202321642138.2U
Authority: CN
Inventors: 刘杰
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-06-26
Filing date: 2023-06-26
Publication date: 2023-11-24
Anticipated expiration: 2033-06-26

Abstract

The utility model discloses a shell of a battery, the battery and an electric device with the same, wherein the shell of the battery comprises: the shell body is opened at one end and is an aluminum piece; the protective layer is a copper piece and is arranged in the shell body and coats at least part of the inner surface of the shell body. According to the shell of the battery, the protective layer is arranged in the shell body and is a copper piece, so that the structural strength of the shell can be improved, the shell body is separated from a battery unit, aluminum and lithium ions are isolated, the shell body is prevented from being corroded by the lithium ions, the probability of thermal runaway is reduced to a certain extent, the reliability of the shell of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

Description

Battery shell, battery and power utilization device with battery shell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery shell, a battery and an electric device with the battery shell.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely applied to the fields of electric automobiles and energy storage as power batteries, and the requirements of people on the usability and safety of the lithium ion batteries are increasing.

In the related art, the lithium ion battery has the advantages of high energy density, long cycle life and the like, and is favored by a power system of a new energy automobile. In order to improve the energy density of the lithium ion battery, a positive electrode material with higher nickel content, a current collector or a separator, or a single battery with a larger size are generally selected, however, with the improvement of the energy density, the safety problem of the battery is also more and more prominent.

At present, after the traditional lithium ion battery structure is subjected to micro short circuit in the outside or inside, the problem that the voltage of the negative electrode side is pulled down is easily generated, so that lithium ions are easily embedded into an aluminum shell to cause corrosion, and the battery safety and the production yield of a production line are further affected.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the shell of the battery, which can prevent lithium ions from corroding the shell body, reduce the probability of thermal runaway, improve the reliability of the shell, ensure the safety of the battery and improve the production yield of a production line.

The utility model also provides a battery, which comprises the battery shell.

The utility model also provides an electric device, which comprises the battery.

The case of the battery according to an embodiment of the present utility model includes: the shell comprises a shell body, wherein one end of the shell body is open, and the shell body is an aluminum piece; the protective layer is a copper piece and is arranged in the shell body and coats at least part of the inner surface of the shell body.

According to the shell of the battery, the protective layer is arranged in the shell body and is made of copper, so that the structural strength of the shell can be improved, the shell body is separated from a battery unit, aluminum and lithium ions are isolated, the shell body is prevented from being corroded by the lithium ions, the probability of thermal runaway is reduced to a certain extent, the reliability of the shell of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

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

in some embodiments, the housing body includes a bottom wall and a side wall, and the protective layer covers an inner surface of the bottom wall and an inner surface of the side wall of the housing body.

In some embodiments, the protective layer is a plate-like structure, the protective layer being disposed in lamination with the housing body.

In some embodiments, the protective layer is a coating disposed on an inner surface of the housing body.

In some embodiments, the protective layer is a separate piece or a unitary piece with the housing body.

In some embodiments, the shell body and the protective layer are stamped and formed from copper aluminum composite sheet strips.

In some embodiments, in a thickness direction of the case body, a total thickness of the case body and the protective layer is L, a thickness of the protective layer is L1, and it satisfies: l1 is less than or equal to 2L/3.

The utility model also provides a battery with the embodiment.

According to the battery provided by the embodiment of the utility model, through the shell provided with the battery, the protective layer is arranged in the shell body and is a copper piece, so that the structural strength of the shell can be improved, the shell body is separated from a battery unit, aluminum and lithium ions are isolated, the lithium ions are prevented from corroding the shell body, the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

The utility model also provides an electric device with the embodiment.

According to the power utilization device provided by the embodiment of the utility model, the battery is provided with the protective layer in the shell body, and the protective layer is a copper piece, so that the structural strength of the shell body can be improved, the shell body is separated from a battery unit, aluminum and lithium ions are isolated, the lithium ions are prevented from corroding the shell body, the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell body of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

In addition, the power utilization device according to the embodiment of the utility model can also have the following additional technical characteristics:

in some embodiments, the power device is an electric vehicle.

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 front view of a case of a battery according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is an enlarged view at B in fig. 2.

Reference numerals:

100. a housing;

1. a housing body; 11. a bottom wall; 12. a sidewall;

2. a protective layer;

3. a cavity.

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

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

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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.

A case 100 of a battery according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a case 100 of a battery according to an embodiment of the present utility model includes a case body 1 and a protective layer 2.

Specifically, referring to fig. 2, one end of the case body 1 is opened for placing the battery pole group, the case body 1 is an aluminum member, the protection layer 2 is a copper member, the protection layer 2 is disposed in the case body 1 and covers at least part of the inner surface of the case body 1, the arrangement of the protection layer 2 can improve the structural strength of the case 100, the case body 1 is spaced apart from the battery pole group, and the protection effect is played on the case body 1 from the inner side of the case body 1. It can be understood that in the prior art, when the battery structure is slightly shorted outside or inside, the problem that the voltage of the negative electrode side is pulled down is easily generated, lithium ions of the battery electrode group react with aluminum of the shell body, so that corrosion of the shell body is caused, explosion is easily generated, copper pieces are additionally arranged between the shell body 1 and the battery electrode group, aluminum and lithium ions can be isolated, the lithium ions are prevented from corroding the shell body 1, so that the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell 100 of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

According to the shell 100 of the battery provided by the embodiment of the utility model, the protective layer 2 is arranged in the shell body 1, and the protective layer 2 is a copper piece, so that the structural strength of the shell 100 can be improved, the shell body 1 is separated from a battery unit, aluminum and lithium ions are isolated, the lithium ions are prevented from corroding the shell body 1, the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell 100 of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

In some embodiments of the present utility model, referring to fig. 1 and 2, a case body 1 includes a bottom wall 11 and a side wall 12, the bottom wall 11 is connected with the side wall 12, the side wall 12 extends in a circumferential direction of a case 100 to form a ring shape, and a protective layer 2 covers an inner surface of the bottom wall 11 and an inner surface of the side wall 12 of the case body 1, so that the bottom wall 11 and the side wall 12 of the case body 1 can be protected from an inner side of the case body 1, the case body 1 is spaced apart from a battery pole group, reliability of the case body 1 is further improved, and safety of a battery is further ensured.

In some embodiments of the present utility model, referring to fig. 2 and 3, the protective layer 2 has a plate-shaped structure, and the protective layer 2 is stacked with the case body 1, so that the processing is convenient, and the protective layer 2 can protect the case body 1.

In some embodiments of the present utility model, the protective layer 2 is a coating layer provided on the inner surface of the housing body 1, and the production and development costs of the housing 100 can be reduced as much as possible while protecting the housing body 1 without re-molding.

In some embodiments of the present utility model, the protective layer 2 and the shell body 1 are separate or integrated, when the protective layer 2 and the shell body 1 are separate, the production and processing of the shell 100 can be facilitated, and the production cost of the shell 100 can be reduced; when the protective layer 2 and the shell body 1 are integrated, the structure is simple, the assembly of the shell 100 can be facilitated, the assembly process of the battery is simplified, and the assembly efficiency of the battery is improved.

In some embodiments of the present utility model, referring to fig. 2, the shell body 1 and the protective layer 2 are formed by stamping a copper-aluminum composite plate strip, so that the material utilization rate is high, the efficiency is high, the operation is simple, the production and processing costs of the shell 100 of the battery can be reduced, the working efficiency is improved, and the labor cost is reduced. The copper-aluminum composite plate is a novel material which is formed by welding a copper plate and an aluminum plate together in a cold rolling, hot rolling, explosion compounding method or explosion rolling method and cannot be separated, has the advantages of low cost, light weight, good heat conduction performance and long service life, can reduce the production cost of the shell 100 of the battery, can improve the service life of the shell 100 of the battery, and further can improve the safety of the battery.

In some embodiments of the present utility model, referring to fig. 3, in the thickness direction of the case body 1, the total thickness of the case body 1 and the protective layer 2 is L, the thickness of the protective layer 2 is L1, and it is satisfied that: l1 is less than or equal to 2L/3, and the cost of the shell 100 can be reduced as much as possible while the reliability of the protective layer 2 is ensured. For example, L1/L may be 1/3, 1/2, or 2/3.

The utility model also provides a battery with the embodiment.

Specifically, the battery includes casing 100 of top cap, utmost point group and foretell battery, and the utmost point group is located in casing 100, and top cap and casing 100 welded connection are isolated with the battery outside with the open department of shutoff shell body 1, play sealed effect to, the inside electric current of battery can be carried to the battery outside through the utmost point post of top cap, play the water conservancy diversion effect.

When the battery is a cylindrical battery, the housing 100 of the battery is a cylinder, the housing 100 has a cavity 3 for accommodating the pole group, and one end of the housing 100 is open; when the battery is a square battery, correspondingly, the casing 100 of the battery is a cuboid, the cavity 3 for placing the pole group is arranged in the casing 100, and one end of the casing 100 is open.

Optionally, an insulating film is disposed on the outer side of the pole group, and in the assembly process of the battery, a layer of insulating film can be coated on the outer side of the pole group, and then the pole group is placed in the housing 100, so that the effects of insulation and protection can be achieved.

It will be appreciated that in order to ensure the safety of the battery, the battery is often subjected to strict safety regulation tests before shipment, but even so the possibility of thermal runaway accidents cannot be completely eliminated. In the prior art, the spontaneous combustion of electric automobiles mostly relates to two processes of thermal runaway and thermal spread of batteries. After the battery is in thermal runaway, a large amount of energy and toxic and combustible gas can be released in a short time, personal safety of passengers is endangered, and serious property loss is caused, so that improvement of thermal stability and safety of the lithium ion battery is urgent, and the arrangement of the insulating film can effectively prevent heat transfer of the thermal runaway battery, so that the thermal runaway is limited in the battery, and harm and loss are reduced as much as possible.

According to the battery provided by the embodiment of the utility model, through the shell 100 provided with the battery, the protective layer 2 is arranged in the shell body 1, and the protective layer 2 is a copper piece, so that the structural strength of the shell 100 can be improved, the shell body 1 is separated from a battery unit, aluminum and lithium ions are isolated, and lithium ions are prevented from corroding the shell body 1, so that the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell 100 of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

The utility model also provides an electric device residing in the embodiment.

According to the power utilization device provided by the embodiment of the utility model, by arranging the battery, the protective layer 2 is arranged in the shell body 1, and the protective layer 2 is a copper piece, the structural strength of the shell 100 can be improved, the shell body 1 is separated from a battery unit, aluminum and lithium ions are isolated, and lithium ions are prevented from corroding the shell body 1, so that the probability of occurrence of thermal runaway is reduced to a certain extent, the reliability of the shell 100 of the battery is improved, the safety of the battery is ensured, the production yield of a production line is improved, and the production cost is reduced.

In some embodiments of the present utility model, the electric device is an electric automobile, and by using the housing 100 provided with the battery according to the embodiments of the present utility model, the safety of the battery can be improved, the reliability of the electric automobile can be improved, and threats to personal safety and property safety can be reduced.

Other constructions and operations of the housing 100 of the battery, and the power consuming device according to the embodiment of the present utility model are known to those skilled in the art, and will not be described in detail herein.

In the description of the present specification, a description referring to terms "one embodiment," "some 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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 housing for a battery, comprising:

the shell comprises a shell body, wherein one end of the shell body is open, and the shell body is an aluminum piece;

the protective layer is a copper piece and is arranged in the shell body and coats at least part of the inner surface of the shell body.

2. The battery case according to claim 1, wherein the case body includes a bottom wall and a side wall, and the protective layer covers an inner surface of the bottom wall and an inner surface of the side wall of the case body.

3. The battery case according to claim 1, wherein the protective layer has a plate-like structure, and the protective layer is laminated with the case body.

4. The battery case according to claim 1, wherein the protective layer is a coating layer provided on an inner surface of the case body.

5. The battery case according to claim 1, wherein the protective layer and the case body are a separate piece or an integral piece.

6. The battery case according to claim 1, wherein the case body and the protective layer are formed by punching a copper-aluminum composite plate material strip.

7. The case of a battery according to claim 1, wherein in a thickness direction of the case body, a total thickness of the case body and the protective layer is L, a thickness of the protective layer is L1, and: l1 is less than or equal to 2L/3.

8. A battery characterized by comprising a case of the battery according to any one of claims 1 to 7.

9. An electrical device comprising the battery according to claim 8.

10. The electrical device of claim 9, wherein the electrical device is an electric vehicle.