CN218957866U

CN218957866U - Battery core shell, battery core and high-capacity battery

Info

Publication number: CN218957866U
Application number: CN202222273269.XU
Authority: CN
Inventors: 席彪; 雷政军; 刘毅
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2023-05-02
Anticipated expiration: 2032-08-29

Abstract

The application discloses electric core casing, electric core, large capacity battery, place soft packet of electric core in the electric core casing, the electric core casing is enclosed by upper cover plate, lower apron and barrel and is closed and form, the electric core casing is still including setting up electrolyte sharing unit on lower apron or the barrel, electrolyte sharing unit includes pipeline and first through-hole, be provided with annotate the liquid mouth down on apron or the barrel, first through-hole with annotate the liquid mouth intercommunication. Through the pipeline of concatenation sharing electrolyte unit, can be effectively convenient accomplish the pipeline equipment for electric core in the large capacity battery all is in under the unified electrolyte injection environment, and homogeneity and the yield of electric core are showing and are improving, can also be for the supplementary electrolyte of later stage and change electrolyte and provide convenience, further integrated pipeline of sharing electrolyte on electric core, make the integrated level of electric core casing higher, simplify assembly procedure, simple structure, excellent in use effect.

Description

Battery core shell, battery core and high-capacity battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell shell, a battery cell and a high-capacity battery.

Background

The square battery with the maximum capacity in the lithium battery in the current market is 300Ah, and is influenced by the battery capacity, and the lithium battery needs to be connected in series and parallel with a plurality of batteries when in energy storage application, so that the connecting parts are various, the connecting steps are complex and tedious, the consumption of a battery management system, wires and a battery box is very large, and the energy storage cost is high.

How to combine small-capacity cells into a large-capacity battery and to have stable battery performance and high yield is a problem to be solved.

Patent CN111969177a discloses a pole assembly integrated with a liquid injection hole, a battery top cover and a liquid injection method, wherein a pole and a conductive pole fixedly arranged at the top end of the pole are provided with a through liquid injection hole correspondingly, and the pole is also provided with an elastic rubber sealing plug for blocking the liquid injection hole; by adopting the mode of integrating the pole and the liquid injection hole, the elastic rubber sealing plug is arranged on the pole, and the liquid injection needle tube pierces the sealing plug and stretches into the battery shell during liquid injection. The method needs to use a needle tube for injecting liquid, and is complex in liquid injection method and difficult to operate.

Patent CN215933770U discloses a battery row and group battery, and the battery row is arranged into the row including a plurality of single cylindrical battery, and the top utmost point post of every single cylindrical battery all passes through the mode electricity of heat welding with the busbar and is connected, and this patent just arranges the welding with cylindrical battery, does not solve battery stability and uniformity problem after a plurality of batteries constitute the battery module.

The technical scheme does not well solve the problem of electrolyte sharing, and has the problems of unbalanced battery quality and low yield.

Disclosure of Invention

In order to solve the problems, the utility model adopts the technical scheme that a soft package battery cell is placed in the battery cell shell, the battery cell shell is formed by enclosing an upper cover plate, a lower cover plate and a cylinder body, the shell further comprises an electrolyte sharing unit arranged on the lower cover plate or the cylinder body, the electrolyte sharing unit comprises a pipeline and a first through hole, a liquid injection port is arranged on the lower cover plate or the cylinder body, and the first through hole is communicated with the liquid injection port.

Further, the lower cover plate or the cylinder body is provided with a fixed base, and the pipeline is paved on the fixed base along the thickness direction of the battery cell shell.

Further, the fixing base is provided with a second through hole, so that the first through hole is communicated with the liquid injection port through the second through hole.

Furthermore, the two ends of the pipeline are respectively provided with a connecting part so that a plurality of electrolyte sharing units are fixedly connected.

Further, one end of the pipeline is provided with a connecting nozzle, the other end of the pipeline is provided with a connecting port, and the connecting nozzles of two adjacent electrolyte sharing units are fixedly connected with the connecting port.

Further, a sealing ring is arranged on the outer circumference of the connecting nozzle and/or the inner circumference of the connecting port.

Furthermore, the pipeline is also provided with a plugging piece.

Further, the liquid injection port is provided with a film so as to seal the liquid injection port; or (b)

The first through hole is provided with a film to seal the first through hole.

Further, the film is soluble in the electrolyte.

Further, the film is also provided with a protective film insoluble in electrolyte, the protective film is attached to one side of the film facing the inside of the cell casing, and when the film is dissolved in the electrolyte, the protective film falls off.

In order to solve the problems, the utility model adopts a technical scheme that the battery cell comprises the battery cell shell.

In order to solve the above problems, the present utility model provides a high-capacity battery, which includes an outer case, and a plurality of the above battery cells stacked in the outer case.

The beneficial effects of this application: through the pipeline of concatenation sharing electrolyte unit, can be effectively convenient accomplish the pipeline equipment for electric core in the large capacity battery all can be in under the unified electrolyte injection environment, and homogeneity and the yield of electric core are showing and are improving, can also be for the supplementary electrolyte of later stage and change electrolyte and provide convenience, further integrated pipeline of sharing electrolyte on electric core, make the integrated level of electric core casing higher, simplify assembly procedure, simple structure, excellent in use effect.

Additional advantages, objects, and features of the utility model 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 utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a cell housing in one embodiment;

FIG. 2 is a schematic cross-sectional view of shared management in one embodiment;

FIG. 3 is a schematic view of the structure of the lower cover plate in one embodiment;

FIG. 4 is a schematic diagram of a shared pipeline in another embodiment;

fig. 5 is a schematic view of the structure of a large-capacity battery in one embodiment.

Reference numerals:

100-cell casing

11-upper cover plate

12-lower cover plate

13-barrel

14-liquid injection port

300-electrolyte sharing unit

31-pipeline

31 a-connecting nozzle

31 b-connecting port

32-first through hole

33-base

34-sealing ring

600-outer shell

401-positive electrode post

402-negative pole post

Detailed Description

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art. Therefore, the utility model is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Hereinafter, a battery cell case, a battery cell, and a large-capacity battery of the present application are specifically disclosed with reference to the accompanying drawings as appropriate. However, unnecessary detailed description may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of the actual same structure may be omitted. This is to avoid that the following description becomes unnecessarily lengthy, facilitating the understanding of those skilled in the art. Furthermore, the drawings and the following description are provided for a full understanding of the present application by those skilled in the art, and are not intended to limit the subject matter recited in the claims.

All embodiments and alternative embodiments of the present application may be combined with each other to form new solutions, unless specifically stated otherwise. All technical features and optional technical features of the present application may be combined with each other to form new technical solutions, unless specified otherwise.

Reference herein to "comprising" and "including" means open ended, as well as closed ended, unless otherwise noted. For example, "comprising" and "including" may mean that other components not listed may also be included or included, or that only listed components may be included or included.

It is further understood that the terms "first," "second," and the like, are merely used to distinguish one entity or action from another entity or action and do not necessarily require or imply any actual relationship or order between such entities or actions.

Example 1

Fig. 1 is a schematic diagram of a cell housing 100. The cell housing 100 is adapted to house a soft pack cell. The cell case 100 is formed by enclosing an upper cover plate 11, a lower cover plate 12 and a cylinder 13, and the cell case 100 further includes an electrolyte sharing unit 300 disposed on the lower cover plate 12 or the cylinder 13. In the present embodiment, the electrolyte sharing unit 300 is disposed on the lower cover plate of the cell housing 100, but in some embodiments, the electrolyte sharing unit 300 may also be disposed on the cylinder 13 or even the upper cover, as the case may be.

As shown in fig. 2, the electrolyte sharing unit 300 includes a pipe 31 and first through holes 32, the lower cover plate 12 is provided with a liquid injection port 14, and a plurality of first through holes 32 are respectively communicated with the liquid injection port 14.

As shown in fig. 3, in some embodiments, the lower cover plate 12 or the cylinder 13 is provided with a fixing base 33, the pipe 31 is laid on the fixing base 33 along the thickness direction of the cell case 100, the axial direction of the pipe 31 coincides with the thickness direction of the cell case 100, and the fixing base 33 is provided with a second through hole so that the first through hole 32 is communicated with the liquid injection port 14 through the second through hole.

As shown in fig. 4, in some embodiments, the base 33 is integrated with the lower cover plate 12, the pipe 31 is integrated with the lower cover plate 12, and a blocking member is further disposed on the pipe.

As shown in fig. 3, in some embodiments, two ends of the pipe 31 are respectively provided with a connection part, so that several electrolyte sharing units are fixedly connected with each other. One end of the pipeline 31 is provided with a connecting nozzle 31a, the other end is provided with a connecting port 31b, the connecting nozzle 31a of two adjacent electrolyte sharing units is fixedly connected with the connecting port 31b, and finally a plurality of small-section pipelines 31 are spliced to form a long electrolyte sharing pipeline. In some embodiments, the outer diameter of the connection nozzle 31a is smaller than the inner diameter of the pipe 31, and the inner diameter of the connection port 31b is equal to or larger than the inner diameter of the pipe 31. The outer diameter of the connection port 31b is equal to the inner diameter of the pipe 31 in terms of the flatness of the whole. In order to ensure the air tightness of the pipe 31 and prevent leakage of electrolyte from the pipe 31, a seal ring 34 is provided at the connection portion of the pipe, for example, a seal ring is provided in the circumferential direction of the connection nozzle 31a and/or a seal ring 34 is provided in the circumferential direction of the connection port 31b, and the number of seal rings may be more than one in order to ensure the sealing effect.

In some embodiments, the conduit is a sleeve that extends through a tunnel formed in the base of the stationary base. The sleeve pipe is crisscross with the tunnel to be set up, and in order to be convenient for understand, sleeve pipe and tunnel length set up the same, sleeve pipe one end stretches out the tunnel certain length, and the other end then leaves certain breach, and this kind of design can let a plurality of pipelines nest concatenation each other. However, it should be noted that the sleeve and the tunnel have the same length only for the convenience of understanding by those skilled in the art, and the length of the sleeve is not particularly limited in practice and may be set according to practical circumstances. Considering that the pipes 31 are to be spliced in this embodiment, in order to make the arrangement of the cell housings 100 as compact as possible, the length of the sleeve and the length of the tunnel should be close to the thickness of the cell housing 100.

In some embodiments, in order to enable the non-formed battery to directly pass through the scheme and simultaneously inject the electrolyte, the uniformity of the battery is improved, and the sharing pipeline can be provided with no film. In other cases, however, the inside of the battery needs to be kept in vacuum, and then a film needs to be disposed on the liquid injection port 14, and when the electrolyte is injected into the battery through the shared pipeline, the film on the liquid injection port 14 is dissolved by the electrolyte, the liquid injection port 14 is opened, and the electrolyte is allowed to enter the cell housing 100. In some cases, a certain amount of electrolyte is stored in the battery, the electrolyte injection port 14 is provided with a film soluble in the electrolyte, a protective film insoluble in the electrolyte needs to be attached to the film in order to prevent the electrolyte in the battery from dissolving the film in advance, the protective film can also play a role in sealing the electrolyte injection port 14, and as the electrolyte dissolves the film, the protective film attached to the film falls off, so that the electrolyte can enter the cell housing 100. The membrane may be disposed on the liquid inlet 14, or may be disposed on the first through hole or the second through hole, and the position of the membrane may be adaptively adjusted according to the assembly or material change in order to seal the passage of the electrolyte into the case.

In some embodiments, the lower cover plate 12 is also provided with a securing portion of the shared conduit 300 along the periphery to provide a more secure securement between the shared conduits.

Example 2

As shown in fig. 5, the present embodiment provides a high-capacity battery, which includes an outer case 600, a positive electrode post 401, a negative electrode post 402, and a plurality of battery cells stacked in the outer case 600, wherein the battery cells include the battery cell case 100 described in embodiment 1, and a soft pack battery cell disposed in the battery cell case. In this embodiment, the positive electrode posts 401 and the negative electrode posts 402 are disposed on both sides of the cell case 100, and extend along the extending direction of the stacked cell cases 100. The cell case 100 is further provided with an electrolyte sharing unit 300. The electrolyte sharing unit is also provided with an explosion venting system of the high-capacity battery.

Fig. 1 is a schematic diagram of a cell housing 100. The cell housing 100 is adapted to house a soft pack cell. The cell case 100 is formed by enclosing an upper cover plate 11, a lower cover plate 12 and a cylinder 13, and the cell case 100 further includes an electrolyte sharing unit 300 disposed on the lower cover plate 12 or the cylinder 13. In the present embodiment, the electrolyte sharing unit is disposed on the lower cover plate of the cell housing 100, but in some embodiments, the electrolyte sharing unit may also be disposed on the cylinder 13 or even the upper cover, as the case may be.

As shown in fig. 4, in some embodiments, the base 33 is integral with the lower cover plate 12 and the conduit 31 is integral with the lower cover plate 12.

As shown in fig. 3, in some embodiments, two ends of the pipe 31 are respectively provided with a connection part, so that several electrolyte sharing units are fixedly connected with each other. One end of the pipeline 31 is provided with a connecting nozzle 31a, the other end is provided with a connecting port 31b, the connecting nozzle 31a of two adjacent electrolyte sharing units is fixedly connected with the connecting port 31b, and finally a plurality of small-section pipelines 31 are spliced to form a long electrolyte sharing pipeline. In some embodiments, the outer diameter of the connection nozzle 31a is smaller than the inner diameter of the pipe 31, and the inner diameter of the connection port 31b is equal to or larger than the inner diameter of the pipe 31. The outer diameter of the connection port 31b is equal to the inner diameter of the pipe 31 in terms of the flatness of the whole. In order to ensure the air tightness of the pipe 31 and prevent leakage of electrolyte from the pipe 31, a seal ring 34 is provided at the connection portion of the pipe, for example, a seal ring is provided in the circumferential direction of the connection nozzle 31a and/or a seal ring 34 is provided in the circumferential direction of the connection port 31b, and the number of seal rings may be more than 1 in order to ensure the sealing effect.

In some embodiments, in order to enable the non-formed battery to directly pass through the scheme and simultaneously inject the electrolyte, the uniformity of the battery is improved, and the sharing pipeline can be provided with no film. In other cases, however, the inside of the battery needs to be kept in vacuum, and then a film needs to be disposed on the liquid injection port 14, and when the electrolyte is injected into the battery through the shared pipeline, the film on the liquid injection port 14 is dissolved by the electrolyte, the liquid injection port 14 is opened, and the electrolyte is allowed to enter the cell housing 100. In some cases, a certain electrolyte is stored in the battery, the electrolyte injection port 14 is provided with a film soluble in the electrolyte, and in order to prevent the electrolyte in the battery from dissolving the film in advance, a protective film insoluble in the electrolyte needs to be attached to one layer of the film, and the protective film can also play a role in sealing the electrolyte injection port 14, and as the electrolyte dissolves the film, the protective film attached to the film falls off, so that the electrolyte can enter the battery cell housing 100. The membrane may be disposed on the liquid inlet 14, or may be disposed on the first through hole or the second through hole, and the position of the membrane may be adaptively adjusted according to the assembly or material change in order to seal the passage of the electrolyte into the case.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. Guidance is provided throughout this application by a series of embodiments, which may be used in various combinations. In the various examples, the list is merely a representative group and should not be construed as exhaustive.

Claims

1. The utility model provides a battery cell casing, place soft packet of electric core in the battery cell casing, its characterized in that, the battery cell casing is enclosed by upper cover plate, lower apron and barrel and is closed and form, the battery cell casing is still including setting up electrolyte sharing unit on lower apron or the barrel, electrolyte sharing unit includes pipeline and first through-hole, be provided with the notes liquid mouth on lower apron or the barrel, first through-hole with annotate liquid mouth intercommunication, the pipeline both ends are provided with connecting portion respectively, so that a plurality of electrolyte sharing unit fixed connection.

2. The cell housing according to claim 1, wherein the lower cover plate or the cylinder is provided with a fixed base, and the pipe is laid on the fixed base in a thickness direction of the cell housing.

3. The cell case according to claim 2, wherein the fixing base is provided with a second through hole so that the first through hole is communicated with the liquid injection port through the second through hole.

4. The cell casing according to claim 1, wherein a connection nozzle is provided at one end of the pipe, a connection port is provided at the other end, and the connection nozzles of two adjacent electrolyte sharing units are fixedly connected with the connection port.

5. The cell housing according to claim 4, wherein a sealing ring is provided on the outer circumference of the connection nozzle and/or on the inner circumference of the connection port.

6. The cell housing of claim 1, wherein the tubing is further provided with a plug.

7. The cell housing of claim 1, wherein the fluid port is provided with a membrane to seal the fluid port; or (b)

The first through hole is provided with a film to seal the first through hole.

8. The cell housing of claim 7, wherein the film dissolves in an electrolyte.

9. The cell housing according to claim 8, wherein the film is further provided with a protective film insoluble in an electrolyte, the protective film being attached to a side of the film facing the inside of the cell housing, and the protective film being peeled off when the film is dissolved in the electrolyte.

10. A battery cell, characterized in that the battery cell comprises a battery cell housing according to any of claims 1-9.

11. A high capacity battery comprising an outer housing and a plurality of the cells of claim 10 stacked within said outer housing.