CN115275543A

CN115275543A - Lithium battery shell and lithium battery

Info

Publication number: CN115275543A
Application number: CN202211050980.7A
Authority: CN
Inventors: 白晓峰; 李坤; 李超; 陈�峰
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-01

Abstract

The invention discloses a lithium battery shell and a lithium battery, which comprise a shell opening and a dissolving assembly, wherein the dissolving assembly seals the shell opening, the dissolving assembly comprises a dissolving base layer, when the dissolving base layer is contacted with electrolyte, the dissolving base layer is dissolved, the shell opening is opened, and the inner cavity of the battery shell is communicated with the outside. After the battery shell with the dissolving component is arranged in an electrolyte cavity of a large-capacity battery, the opening of the shell can be automatically opened, so that the electrolyte cavities of the single battery and the large-capacity battery are communicated, the shell is simple in structure, and the shell is opened without mechanical operation.

Description

Lithium battery shell and lithium battery

Technical Field

The invention relates to the technical field of batteries, in particular to a lithium battery shell and a lithium battery.

Background

At present, the lithium cell group in the market has a plurality of advantages and is widely applied to each field, in current lithium cell application, often relate to the use of super large capacity battery, however in the research and development of large capacity energy storage battery, china still is in basic blank stage, be limited to production facility, safety technology, the rejection rate is high, factors such as volume production cost, however adopt a plurality of little batteries parallelly connected to form in the aspect of using large capacity lithium cell mostly, cause from this to solve the uniformity of each little battery and the battery management problem between each little battery, current large capacity lithium cell mostly independently fills oneself with to annotate, use electrolyte, lead to large capacity lithium cell whole working property poor, the uniformity of battery can be more and more poor after long-term the use, not only there is the potential safety hazard, and seriously influence the life of battery.

The electrolyte cavity of a single battery is communicated with the electrolyte cavity of a large-capacity battery, so that all single batteries are in a uniform electrolyte system, the problem of poor consistency caused by different consumption of single electrolyte in the operation process of the large-capacity battery can be solved, and the problem of how to communicate the electrolyte cavity of a single battery core with the electrolyte cavity of the large-capacity battery is solved.

In the prior art, a liquid injection hole is formed in a top cover of a battery to perform mechanical liquid injection, but the mode is troublesome to operate and cannot automatically communicate an electrolyte cavity of a single battery with an electrolyte cavity of a large-capacity battery.

Patent CN1124905443A discloses a battery top cover, which is provided with a liquid injection hole on the battery manuscript to inject the battery, and the electrolyte injection is still performed mechanically, and the electrolyte sharing of the large-capacity battery cannot be formed.

Patent CN1120432058A discloses a battery cell and a battery, wherein a liquid injection hole is also formed in the cell for mechanical liquid injection.

Disclosure of Invention

In view of the above, it is desirable to provide a battery pack that has a simple structure and allows the electrolyte chamber of the single cell to communicate with the electrolyte chamber of the large-capacity battery without requiring mechanical operation.

The invention provides a lithium battery shell which comprises a shell opening and a dissolving assembly, wherein the dissolving assembly seals the shell opening, the dissolving assembly comprises a dissolving base layer, when the dissolving base layer is contacted with electrolyte, the dissolving base layer is dissolved, the shell opening is opened, and the inner cavity of the battery shell is communicated with the outside.

Further, the material of the dissolving base layer is at least one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene-methyl dimethacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecamide, polyamide, imide PAI, and styrene-butadiene copolymer.

Furthermore, the dissolving component also comprises an isolation layer, wherein the isolation layer is attached to the inner surface of the dissolving base layer, and the inner surface of the dissolving base layer is a surface opposite to the inner cavity of the shell.

Further, the isolating layer is a thin film insoluble in the electrolyte.

Further, the film is a polyethylene film or a polypropylene film, and the thickness of the film is less than 0.1mm.

Further, the isolation layer is a coating coated on the inner surface of the dissolution base layer, the isolation layer comprises a binder and a solvent, the binder is at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose and polyvinyl alcohol, the solvent is at least one of N-methyl pyrrolidone, N-dimethylformamide, N-diethylformamide, dimethyl sulfoxide, tetrahydrofuran and water or alcohol, and the dissolution base layer is bonded on the opening of the shell through the isolation layer.

Furthermore, the dissolving component further comprises an isolating component, the isolating component is arranged between the shell opening and the dissolving base layer, the isolating component seals the shell opening, and the dissolving base layer is pressed and fixed on the isolating component.

Further, the isolation component is a sphere, and the diameter of the sphere is larger than that of the opening of the shell.

Furthermore, a fixing part is arranged outside the opening of the shell to fix the dissolving component, a through channel is arranged on the fixing part and communicated with the inner cavity of the shell, and the dissolving component is arranged in the through channel to seal the opening of the shell.

Furthermore, a bearing platform is arranged in the fixing part to place the dissolving component.

Further, the thickness of the dissolving base layer is not more than 2mm.

In another aspect of the present invention, a lithium battery case is provided, and the material of the case is at least one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer.

In another aspect of the present invention, a lithium battery, the foregoing lithium battery case and an electrode assembly are provided, the electrode assembly being disposed in the lithium battery case.

The invention has the beneficial effects that:

1. according to the invention, the dissolving component is arranged on the opening of the single battery shell, when the single batteries are in a natural state, the dissolving component seals the shell opening, the electrolyte in the batteries is isolated from the outside, when one or more single batteries are placed in the electrolyte cavity of a large-capacity battery, the dissolving component on the battery shell is dissolved by the external electrolyte, and the shell opening is opened, so that the electrolyte cavity of the single battery is communicated with the electrolyte cavity of the large-capacity battery, and a plurality of single batteries are in a shared electrolyte system, so that the difference of the batteries caused by different electrolyte consumption is eliminated, the consistency and stability of the batteries are improved, and the performance of the batteries is improved.

2. The polyamide dissolving base layer becomes a hydrophilic group after being dissolved by the electrolyte, has good water absorption, can capture moisture in the electrolyte, plays a role of an electrolyte additive, and simultaneously improves the cycle performance and the battery stability of the lithium ion battery.

3. The battery shell with the dissolving component of this patent simple structure, simple to operate, the isolation layer that dissolves the component has the bonding effect, only needs to dissolve the component and bonds at the casing opening part, can realize dissolving the installation of component.

4. The battery shell can realize the communication between the electrolyte cavity of the single battery and the electrolyte cavity of the large-capacity battery without mechanical operation, and has strong applicability.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a cell casing structure in which a lysing assembly according to an embodiment of the present application is a lysing substrate;

FIG. 2 is a schematic view of a cell casing structure with a lysing assembly as the lysing base layer and the separation layer according to one embodiment of the present application;

FIG. 3 is a schematic view of a battery case with a fixing portion at an opening of the case according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of an embodiment of the present application showing a housing opening with a spacer assembly and a dissolving substrate;

FIG. 5 is a schematic view of a cell housing having a lysing assembly according to one embodiment of the present application;

FIG. 6 is a schematic view of a cell casing structure with a lysing assembly as the lysing base layer and the separation assembly according to one embodiment of the present application;

fig. 7 is a schematic structural diagram of a plurality of single batteries disposed in a large-capacity battery case according to an embodiment of the present application.

The reference numbers are as follows:

1-a cell casing; 2-shell opening; 3-a dissolution component; 31-dissolving the base layer; 32-barrier coating; 33-an isolation component; 4-fixed part, 41-supporting platform, 42-through channel, 43-base, 5-shell of large-capacity battery, 6-shared electrolyte cavity.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

Example 1

The present embodiment provides a lithium battery case 1, as shown in fig. 1 and fig. 7, including a case opening 2 and a dissolving component 3, where the case opening 2 is generally circular, in the present embodiment, the dissolving component 3 is a dissolving base layer 31 soluble in an electrolyte, the dissolving base layer 31 is a circular thin sheet having a diameter larger than that of the case opening 2, and covers the case opening, the dissolving base layer is made of one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecamide, polyamide, imide PAI, and styrene-butadiene copolymer, and in the present embodiment, the dissolving base layer has a thickness of 2mm, and can be fixed on the case opening 2 by an adhesive, and since the area of the dissolving base layer 31 is larger than that of the case opening 2, and covers the case opening 2, the case opening 2 is sealed.

Experiments prove that the materials such as Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene-methyl dimethacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyformaldehyde, polydodecamide, polyamide, imide PAI, styrene-butadiene copolymer and the like can be gradually dissolved by the electrolyte and disappear after being soaked in the conventional electrolyte for a period of time. The dissolution time of different materials by the electrolyte is different, and the dissolution time is 1-7 days.

As shown in fig. 7, when a plurality of single batteries having the case of this embodiment are placed in the electrolyte cavity 6 of the large-capacity battery, since the shared electrolyte cavity 6 is filled with the electrolyte, the case opening 2 is immersed in the electrolysis, and the dissolution base layer 31 gradually disappears due to the dissolution in the electrolysis, therefore, the case opening 2 is opened to make the inside of the battery case communicate with the outside, and the electrolyte flows into the single batteries through the case opening 2, thereby realizing the communication between the electrolyte cavity inside the single batteries and the electrolyte cavity of the large-capacity battery.

In the in-service use, the battery makes the surplus electrolyte volume different because electrolyte consumes differently after using for a period, thereby make the battery performance produce the difference, the battery uniformity is not good, arrange a plurality of battery cells that have this casing in the sharing electrolyte chamber of large capacity battery, because it has electrolyte to fill in the sharing electrolyte chamber 6, after casing open-ended dissolves basic unit 31 and dissolves in electrolyte, the electrolyte of large capacity battery flows into inside the battery, the electrolyte that has realized all battery cells and the electrolyte chamber intercommunication of large capacity battery, all battery cell's electrolyte is in the uniform state, the battery difference has been reduced, thereby the uniformity and the stability of battery have been improved, thereby the performance of battery has been improved.

It is easily understood by those skilled in the art that the material of the dissolution base layer 31 may be more than one layer, and may be formed by pressing or laminating two or more materials among the materials listed in embodiment 1, and the dissolution base layer formed by combining different materials has different dissolution rates and dissolution times in the electrolyte.

Example 2

As shown in fig. 2 and 7, the present embodiment provides a battery case 1, which includes a case opening 2 and a dissolving component 3, the case opening is generally circular, the dissolving component 3 includes a dissolving base layer 31 and a separating layer 32, in the present embodiment, the dissolving base layer 31 is a circular thin sheet with a thickness of 2mm and a diameter larger than the diameter of the case opening, and covers the case opening 2, and the dissolving base layer 31 is made of one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene-methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecamide, polyamide, imide PAI, and styrene-butadiene copolymer.

In this embodiment, the isolation layer 32 is a coating layer coated on the inner surface of the dissolution base layer 31, the inner surface of the dissolution base layer 31 is a surface facing the inner cavity of the housing, and the coating layer completely covers the inner surface of the dissolution base layer 31, the coating layer includes a binder and a solvent, the binder is at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose, and polyvinyl alcohol, and the solvent is at least one of N-methylpyrrolidone, N-dimethylformamide, N-diethylformamide, dimethyl sulfoxide, tetrahydrofuran, and water or alcohol.

The preparation method of the coating in the embodiment comprises the following steps: the method comprises the steps of putting 10g of adhesive into 90g of solvent, uniformly stirring to form a mobile phase coating, uniformly spraying the coating on the inner surface of a dissolving base layer 31, wherein the inner surface is the surface of the dissolving base layer 31 opposite to the inner cavity of a shell, and because the selected adhesive is insoluble in electrolyte, the formed coating is insoluble in the electrolyte, an isolating layer 32 insoluble in the electrolyte is formed on the inner surface of the dissolving base layer 31, the inner surface of the dissolving base layer 31 covers the shell opening 2, and because the coating contains the adhesive, the dissolving base layer 31 can be adhered to the shell opening, and the area of the dissolving base layer 31 is larger than that of the shell opening, so that the dissolving component 3 can seal the shell opening.

The method for manufacturing the coating layer in this embodiment is only exemplary, and the quality of the binder and the solvent is not limited to the quality listed in this embodiment, and can be adjusted according to the size of the shell opening and the dissolution base layer 31.

As shown in fig. 7, a plurality of single batteries having the case of this embodiment are placed in the shared electrolyte cavity 6 of the large-capacity battery, the shared electrolyte cavity 6 is filled with electrolyte, the case opening 2 is soaked in the electrolyte, because the inner surface of the dissolution base layer 31 in this embodiment has the isolation coating, the dissolution base layer 31 cannot be dissolved by the electrolyte inside the single battery, the dissolution base layer 31 only can be dissolved by the electrolyte outside the single battery, that is, the electrolyte inside the shared electrolyte cavity of the large-capacity battery dissolves and gradually disappears, after the dissolution base layer 31 is dissolved, the isolation layer 32 coated on the inner surface of the dissolution base layer loses the attached carrier, and the case opening is not sealed again, under the fluid action of the electrolyte, the case opening 2 is opened to make the inside and the outside of the single battery case run through, the electrolyte flows into the single battery through the case opening 2, thereby realizing the communication between the electrolyte cavity inside the single battery and the electrolyte cavity of the large-capacity battery.

In the in-service use, the battery uses and produces the difference because electrolyte consumes the difference after a period of time, thereby the performance of battery cell produces the difference, the battery uniformity is different, place a plurality of battery cells that have this casing in the electrolyte chamber of large capacity battery, because it has electrolyte to fill in the shared electrolyte cavity 6, after casing 2 mouthful dissolution basic unit 31 dissolves, the electrolyte of large capacity battery flows into inside the battery, the electrolyte chamber of having realized all battery cells communicates with the electrolyte chamber of large capacity battery, the electrolyte of all battery cells is in the uniform state, the battery difference has been reduced, thereby the uniformity and the stability of battery have been improved, thereby the performance of battery has been improved.

In another embodiment, the isolation layer 32 is a polyethylene film or a polypropylene film insoluble in the electrolyte, the thickness of the film is 0.1mm, the isolation layer 32 covers the inner surface of the dissolution base layer 31, the inner surface is a surface of the dissolution base layer 31 opposite to the inner cavity of the shell, the dissolution component covered with the isolation layer 32 is fixed on the shell opening 2 in an adhesive manner, and the area of the dissolution base layer 31 is larger than that of the shell opening 2, so that the dissolution component 2 seals the shell opening.

The plurality of single batteries with the shells of the embodiment are placed in the electrolyte cavities of the large-capacity batteries, the shared electrolyte cavity 6 is filled with electrolyte, the shell openings 2 are soaked in the electrolyte, the dissolving base layer 31 in the embodiment has a film insoluble in the electrolyte, so the dissolving base layer 31 cannot be dissolved by the electrolyte inside the single batteries, the dissolving base layer 31 only can be dissolved by the electrolyte in the large-capacity electrolyte cavity outside the single batteries and gradually disappears, after the dissolving base layer 31 is dissolved, the isolating layer 32 covering the inner surface of the dissolving base layer 31 loses attached carriers, and the shell openings are not sealed any more, therefore, the shell openings 2 are opened to enable the inside and the outside of the battery shells to be communicated, the electrolyte flows into the single batteries through the shell openings 2, and accordingly the communication between the electrolyte cavities inside the single batteries and the electrolyte cavities of the large-capacity batteries is achieved.

Example 3

The present embodiment provides a battery case 1, as shown in fig. 3, 5 and 7, which includes a battery case 1, a case opening 2, the case opening being generally circular, a dissolution component 3 and a fixing portion 4, the dissolution component 3 being a dissolution component of example 1 having only a dissolution base layer 31 or example 2 having an isolation layer 32 coated on an inner surface of the dissolution base layer 31, the dissolution base layer 31 being made of one or more materials of the dissolution base layers listed in examples 1 and 2, the fixing portion 4 being disposed outside the case opening 2, the fixing portion 4 being provided with a base 43, a through channel 42, and a support table 41 in the through channel 42, the through channel being a cylindrical channel, the through channel 42 being communicated with the case opening 2, the diameter of the through channel 42 being equal to or larger than the diameter of the case opening 2, the dissolution component 3 being fixedly placed on the support table 41, the fixing manner being bonding, and the dissolution component 3 sealing the through channel 42. Thus, the dissolution assembly 3 seals the housing opening. The fixing part is made of metal or plastic insoluble in electrolyte, and the fixing part 4 can be fixed on the shell in a bonding or welding mode.

A plurality of single batteries with the case of this embodiment are placed in the electrolyte chamber of a large capacity battery, and the case opening 2 is immersed in electrolysis.

When dissolving subassembly 3 only for dissolving basic unit 31, dissolve basic unit 31 and disappear because dissolve in electrolyte gradually, no longer sealed through-channel 42, casing opening 2 is opened, and battery cavity is inside to link up with the outside, and electrolyte flows into the battery cell through-channel 42 and casing opening 2 to the inside electrolyte chamber of battery cell and the electrolyte chamber intercommunication of large capacity battery have been realized.

When dissolving subassembly 3 and being the solution base 31 surface that embodiment 2 said and covering with isolation layer 32, this dissolves the subassembly and can not be dissolved by the inside electrolyte of monomer battery, dissolve base 31 and can only be dissolved by the outside electrolyte of monomer battery, can be dissolved by the electrolyte in the sharing electrolyte cavity 6 of large capacity battery and disappear gradually promptly, after dissolving base 31 and being dissolved, coating and dissolving the isolation layer 32 of base 31 internal surface and having lost adnexed carrier, no longer sealed through channel 42, casing opening 2 is opened, the inside and outside of monomer battery cavity link up, electrolyte flows into in the monomer battery through casing opening 2, thereby realized the inside electrolyte chamber of monomer battery and the sharing electrolyte chamber intercommunication of large capacity battery.

In the in-service use, the battery uses and produces the difference because electrolyte consumes the difference after a period of time, thereby the performance of battery cell produces the difference, the battery uniformity is different, place a plurality of battery cells that have this casing in the electrolyte chamber of large capacity battery, because it has electrolyte to fill in the shared electrolyte cavity 6, after casing open-ended dissolving basic unit 31 dissolves, the electrolyte of large capacity battery flows into inside the battery, the electrolyte chamber that has realized all battery cells communicates with the electrolyte chamber of large capacity battery, the electrolyte of all battery cells is in the uniform state, the battery difference has been reduced, thereby the uniformity and the stability of battery have been improved, thereby the performance of battery has been improved.

Example 4

As shown in fig. 4 and 7, the present embodiment provides a battery case 1, which includes a case opening 2 and a dissolution component 3, wherein the dissolution component 3 includes a dissolution base layer 31 and a separation component 33, the case opening 2 is a generally circular opening, in the present embodiment, the separation component 33 is a sphere with a diameter larger than that of the case opening 2, the material of the separation component is a material insoluble in electrolyte, such as glass or plastic, the dissolution base layer 31 is a cylindrical structure with a thickness of 2mm and an opening at one end, the separation component 33 is enclosed and pressed against the case opening 2 to seal the case opening 2, and the dissolution component 3 is fixed on the case opening 2 by gluing or the like.

The material of the dissolving base layer 31 is one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene-methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecamide, polyamide, imide PAI, and styrene-butadiene copolymer. Experiments prove that the material can be dissolved by the electrolyte.

As shown in fig. 7, a plurality of single batteries having the case of this embodiment are placed in a shared electrolyte cavity of a large-capacity battery, since the shared electrolyte cavity 6 is filled with electrolyte, the case opening 2 is soaked in the electrolyte, and the dissolving base layer 31 gradually disappears due to being dissolved in the electrolyte, at this time, the dissolving base layer 31 no longer presses the isolation component 33, the isolation component 33 leaves the case opening 2, the case opening 2 is opened to make the inside of the single battery and the outside of the single battery run through, and the electrolyte flows into the single battery through the case opening 2, thereby realizing the communication between the electrolyte cavity inside the single battery and the electrolyte cavity of the large-capacity battery.

Example 5

As shown in fig. 6 and 5, a large capacity battery case 1 includes a case opening 2, a fixing portion 4 and a dissolving component 3, the dissolving component 3 includes a dissolving base layer 31 and an isolating component 33, the fixing portion 4 is fixedly disposed on a tubular structure outside the case opening 2, the fixing portion 4 is made of metal or plastic insoluble in electrolyte, the fixing manner is bonding or welding, the fixing portion includes a through channel 42, the through channel 42 penetrates an inner cavity of the case and the outside of the case, the dissolving base layer 31 is a circular sheet with a thickness of 2mm and a diameter larger than the diameter of the case opening, the isolating component 33 is a sphere with a diameter larger than the diameter of the case opening, and the material of the isolating component can be glass or plastic and other materials insoluble in electrolyte. The dissolving base layer 31 is mounted on the fixing portion by means of bonding or screwing, etc., and presses the separator 33 to seal the through-channel 42, thereby isolating the inside of the battery from the outside.

As shown in fig. 7, a plurality of single batteries having the case of this embodiment are placed in the shared electrolyte cavity 6 of the large-capacity battery, since the shared electrolyte cavity 6 is filled with electrolyte, the case opening 2 is soaked in the electrolyte, the dissolved base layer 31 gradually disappears due to being dissolved in the electrolyte, after the dissolved base layer 31 disappears, the isolation component 33 is no longer pressed, the through channel 42 is no longer sealed, therefore, the case opening 2 is opened to make the inside of the battery case run through with the outside, the electrolyte flows into the single batteries through the case opening 2, and thereby the electrolyte cavity inside the single batteries and the electrolyte cavity of the large-capacity battery are communicated.

In actual use, the battery uses and produces the difference because electrolyte consumes the difference after a period of time, thereby the performance of battery cell produces the difference, the battery uniformity is different, place a plurality of battery cells that have this casing in the electrolyte chamber of large capacity battery, because it has electrolyte to fill in the shared electrolyte cavity 6, after casing open-ended dissolving basic unit 31 is dissolved, the electrolyte of large capacity battery flows into inside the battery, the electrolyte chamber that has realized all battery cells communicates with the electrolyte chamber of large capacity battery, the electrolyte of all battery cells is in the uniform state, the battery difference has been reduced, thereby the uniformity and the stability of battery have been improved, thereby the performance of battery has been improved.

Example 6

The embodiment provides a battery case, the material of the case is at least one of Propylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecamide, polyamide, imide PAI, and styrene-butadiene copolymer, and the material of the case may be one of single materials or a multilayer case made of more than two materials to meet the time requirement that the case is dissolved by electrolyte.

The plurality of single batteries with the shells in the embodiment are placed in the shared electrolyte cavity of the large-capacity battery, the shared electrolyte cavity 6 is filled with electrolyte, the shells are gradually dissolved by the electrolyte and disappear, the electrodes in the shells are located in the electrolyte cavities of the common large-capacity battery, so that all the single batteries are in a uniform electrolyte environment, the difference of the batteries caused by different electrolyte consumption in the operation process is eliminated, the materials of the shells also have the effect of electrolyte additives after being dissolved, the moisture of the electrolyte can be removed, and the service life of the batteries is prolonged.

The battery shell can be a soft-package battery shell or a hard-shell battery shell, and the use of the battery shell is not limited to the use of a certain battery.

The dissolving component in the invention can be arranged on the upper cover of the shell, or the bottom of the shell, or the side surface of the shell, and can be arranged at any position which can enable the dissolving component to be conveniently arranged in the electrolyte cavity of the high-capacity battery.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

While embodiments of the invention have been disclosed above, it is not intended that they be limited to the applications set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims

1. A lithium battery shell is characterized by comprising a shell opening and a dissolving component, wherein the dissolving component seals the shell opening, the dissolving component comprises a dissolving base layer, when the dissolving base layer is contacted with electrolyte, the dissolving base layer is dissolved, the shell opening is opened, and the inner cavity of the battery shell is communicated with the outside.

2. The lithium battery shell as recited in claim 1, wherein the material of the dissolving base layer is at least one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer.

3. The lithium battery case as recited in claim 1, wherein the dissolution assembly further comprises an isolation layer attached to an inner surface of the dissolution substrate, the inner surface of the dissolution substrate being opposite the interior cavity of the case.

4. A lithium battery cell casing as claimed in claim 3, characterized in that the separator is a thin film that is insoluble in the electrolyte.

5. The lithium battery cell casing of claim 4, wherein the film is a polyethylene film or a polypropylene film, and the film thickness is less than 0.1mm.

6. The lithium battery case as claimed in claim 3, wherein the separator is a coating layer coated on an inner surface of the dissolution base layer, the separator includes a binder and a solvent, the binder is at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose, and polyvinyl alcohol, the solvent is at least one of N-methylpyrrolidone, N-dimethylformamide, N-diethylformamide, dimethyl sulfoxide, tetrahydrofuran, and water or alcohol, and the separator bonds the dissolution base layer to the case opening.

7. The lithium battery shell as recited in claim 1, wherein the dissolution assembly further comprises an isolation assembly, the isolation assembly is disposed between the shell opening and the dissolution base layer, the isolation assembly seals the shell opening, and the dissolution base layer presses against and fixes the isolation assembly.

8. The lithium battery cell casing of claim 7, wherein the separator element is a sphere having a diameter greater than the diameter of the casing opening.

9. The lithium battery cell casing as claimed in any one of claims 1 to 8, wherein a fixing portion is provided outside the opening of the casing for fixing the dissolution assembly, the fixing portion is provided with a through passage communicating with the inner cavity of the casing, and the dissolution assembly is provided in the fixing portion for sealing the through passage.

10. The lithium battery cell casing of claim 9, wherein a support platform is provided within the through passage for placement of the dissolution assembly.

11. The lithium battery cell casing of claim 1, wherein the dissolving substrate is less than 2mm thick.

12. The lithium battery shell is characterized in that the shell is made of at least one of Polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer rubber (TPU), styrene-methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylate rubber-styrene-acrylonitrile copolymer (ASA), polyformaldehyde, polydodecanamide, polyamide, imide PAI and styrene-butadiene copolymer.

13. A lithium battery comprising a lithium battery case according to any one of claims 1 to 12 and an electrode assembly disposed in the lithium battery case.