CN217823198U

CN217823198U - Square battery shell, battery and large-capacity battery

Info

Publication number: CN217823198U
Application number: CN202220904949.4U
Authority: CN
Inventors: 刘毅; 雷政军; 郑高峰; 姚超勇
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-11-15
Anticipated expiration: 2032-04-19

Abstract

The application relates to a square battery shell and a large-capacity battery, which comprise a mounting part and a dissolving component, wherein the mounting part is provided with a mounting hole penetrating through the shell, the dissolving component comprises a base, a connecting pipe protruding out of the base and a dissolving mechanism, the base is provided with a through hole penetrating through the connecting pipe, the dissolving mechanism is arranged in the connecting pipe, and the dissolving mechanism seals the connecting pipe; the connecting pipe penetrates through the mounting hole from the inside to the outside of the shell, and the base is hermetically mounted on the mounting part; when the electrolyte passes through the dissolving component from the outside of the shell to the inside, the dissolving mechanism is dissolved and opened, and the electrolyte enters the inside of the shell. This application sets up the dissolution subassembly on square shell battery, simple structure, and the installation of being convenient for can make a plurality of square shell batteries be in the electrolyte system of homogeneous, improves the performance and the yield of battery.

Description

Square battery shell, battery and large-capacity battery

Technical Field

The application relates to the technical field of square-shell batteries, in particular to a square-shell battery with a dissolving component and a large-capacity battery composed of the square-shell battery.

Background

The square battery of the lithium battery with the maximum capacity in the current market is 300Ah, the cylindrical battery with the maximum capacity is not more than 100Ah, under the background of 'carbon peak reaching' and 'carbon neutralization', the energy storage industry is expected to be developed greatly, but is influenced by the battery capacity, the lithium battery needs to be connected with a plurality of batteries in series and parallel when the energy storage is applied, the connecting spare and accessory parts are various, the connecting steps are complex and cumbersome, the battery management system and the wire rods are very large in the using amount of the battery box, and the energy storage cost is high.

The square battery has the advantages of high packaging reliability, high system energy efficiency, simple structure, relatively convenient capacity expansion and the like, and the problem that how to combine the square battery into a large-capacity battery and the battery has stable battery performance and high yield needs to be solved.

Patent CN111599955A provides a no module class aluminum hull battery module, and it arranges a plurality of aluminum hull electricity cores and constitutes electric core module, and the utmost point post of aluminum hull electricity core is connected through the aluminium bar that converges, arranges electric core module in the casing, constitutes the battery module, arranges a plurality of battery modules in the battery box, constitutes the aluminum hull battery. However, the invention does not solve the problems of stability and consistency of the battery after a plurality of square-shell batteries form the battery module.

Patent CN212810407U proposes a square aluminum-casing battery, in which the sealing space formed by every two square aluminum-casing batteries and the cover plate shares a surface adjacent to each other and is connected together through a shared surface to form a connected square aluminum-casing battery, which is only simple to connect each single battery, and does not solve the problems of battery stability and consistency after a plurality of square-casing batteries form a battery module.

Disclosure of Invention

In view of the above, it is desirable to provide a prismatic battery case, a battery and a large capacity battery comprising the same, which can improve battery performance and yield by allowing a plurality of prismatic batteries to be in a uniform electrolyte system.

The technical scheme of this patent is as follows:

a square battery shell comprises a mounting part and a dissolving assembly, wherein the mounting part is provided with a mounting hole penetrating through the shell, the dissolving assembly comprises a base, a connecting pipe protruding out of the base and a dissolving mechanism, the base is provided with a through hole penetrating through the connecting pipe, the dissolving mechanism is arranged in the connecting pipe, and the dissolving mechanism seals the connecting pipe; the connecting pipe penetrates through the mounting hole from the inside to the outside of the shell, and the base is mounted on the mounting part in a sealing manner;

when electrolyte passes through the dissolving assembly from the outside to the inside of the shell, the dissolving mechanism is dissolved and opened, and the electrolyte enters the inside of the shell.

Preferably, the mounting hole is a stepped hole, the stepped hole is provided with a first hole and a second hole from the inside to the outside of the shell in sequence, the aperture of the first hole is larger than that of the second hole, the base is arranged in the first hole in a penetrating manner, and the connecting pipe is arranged in the second hole in a penetrating manner.

Preferably, the dissolving component further comprises a nut, an external thread matched with the nut is arranged on the connecting pipe, and the nut is arranged outside the shell and connected with the external thread of the connecting pipe.

Preferably, the dissolving assembly further comprises a sealing gasket, and the sealing gasket is arranged between the mounting part and the screw cap.

Preferably, the dissolving assembly further comprises a sealing ring, and the sealing ring is arranged between the base and the mounting part.

Preferably, the dissolving mechanism comprises a dissolving sheet which can be dissolved in the electrolyte and a protective film which is not dissolved in the electrolyte, and the protective film is arranged on one surface of the dissolving sheet opposite to the inner part of the shell and used for sealing and isolating the inner part of the shell.

Preferably, a bearing platform is arranged in the connecting pipe, and the dissolving mechanism is arranged on the bearing platform to seal the connecting pipe.

Preferably, the dissolving component further comprises a pressing part, the pressing part presses and fixes the dissolving mechanism, and the pressing part is hollow and is communicated with the connecting pipe and tightly connected with the connecting pipe.

Preferably, the pressing part is provided with an external thread, an internal thread matched with the external thread is arranged in the connecting pipe, and the connecting pipe is tightly connected with the pressing part through a thread.

Preferably, the dissolving sheet is made of one or more of polymethyl methacrylate, silicon rubber, polyvinyl chloride, polycarbonate or ABS plastics.

Preferably, the dissolving sheet is a polymethylmethacrylate sheet.

Preferably, the dissolving tablet has a thickness of not more than 2mm.

Preferably, the thickness of the protective film is less than 0.1mm.

A prismatic battery includes a battery case, an electrode assembly disposed in the case, and a cap assembly sealing the case.

The utility model provides a large capacity battery, includes two at least square batteries and many branches liquid storage pipeline, many branches liquid storage pipeline include trunk line and two at least branch pipes, there is the stock solution chamber in the trunk line to hold electrolyte, the branch pipe with the connecting pipe one-to-one is connected, in order to realize the stock solution pipeline with square battery intercommunication.

Preferably, a butt joint piece is arranged between the square battery connecting pipe and the branch pipe and is communicated with the connecting pipe and the branch pipe. Compared with the prior art, the beneficial effects of this application are as follows:

this application is through setting up the dissolution subassembly on square battery casing, and the dissolution unit mount is on the battery casing mounting hole, and when the battery was when natural state, the battery casing can be sealed to the dissolution subassembly for the battery keeps apart with the external world, and when arranging the dissolution subassembly in outside electrolyte, the mechanism that dissolves in the subassembly can be dissolved by electrolyte and make inside electrolyte flows into the battery casing, can realize annotating liquid and a plurality of batteries to the battery and be in unified electrolyte system.

The battery shell has the advantages of simple structure, simple and convenient installation and strong universality.

Drawings

FIG. 1 is a schematic diagram of a battery housing having a dissolution mechanism according to one embodiment;

FIG. 2 is a sectional view of a battery mounting portion with a dissolving assembly provided thereon;

FIG. 3 is a schematic diagram of a battery housing having a dissolution mechanism according to one embodiment;

FIG. 4 is a schematic view of a high capacity battery;

FIG. 5 is a schematic view of a multi-branch liquid storage pipeline;

the reference numerals in the specification are as follows:

1-battery case 2-dissolution component 201-base 202-connecting pipe 203-dissolution mechanism 3-mounting part 4-mounting hole 41-first hole 42-second hole 5-sealing ring 6-sealing gasket 7-through hole 8-nut 9-support table 10-press part 11-multi-branch liquid storage pipeline 110-main pipeline of multi-branch liquid storage pipeline

111-branch pipes 112 of the multi-branch liquid storage pipeline-liquid storage cavities 12-square batteries.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Example 1

As shown in fig. 1, the present embodiment provides a prismatic battery case with a dissolution component, the dissolution component 2 includes a base 201, a connecting pipe 202 protruding from the base and a dissolution mechanism 203, the case has a mounting hole 4, a mounting portion 3 is a case surface where the mounting hole 4 is located, a through hole 7 is formed on the base, the through hole 7 is communicated with the connecting pipe 202, the connecting pipe 202 passes through the mounting hole 4 from the inside of the case to the outside, the base 201 is hermetically mounted on the mounting portion 3 by gluing, the dissolution mechanism 203 is arranged in the connecting pipe 202, the dissolution mechanism 203 is a polymethyl methacrylate sheet with a polypropylene film coated on one surface, the thickness of the polymethyl methacrylate sheet is 2mm, the thickness of the polypropylene film is 0.1mm, and the polypropylene film is completely coated on the surface of the polymethacrylate corresponding to the inside of the case, the dissolution mechanism 203 is hermetically mounted in the connecting pipe 202, so that a sealed cavity is formed between the connecting pipe 202 and the inside of the case.

When the battery shell is in a natural state, the interior of the battery shell is sealed and isolated from the exterior; when the battery shell is placed in external electrolyte, or when electrolyte is injected into a connecting pipe of the dissolving component, the electrolyte contacts the polymethyl methacrylate sheet, and the polymethyl methacrylate sheet can be dissolved by the electrolyte and gradually disappears.

Example 2

As shown in fig. 2 and fig. 3, the present embodiment provides a prismatic battery case with a dissolution assembly, the dissolution assembly includes a base 201, a connection pipe 202 and a dissolution mechanism 203 protruding from the base, a through hole 7 is formed in the base, the through hole is communicated with the connection pipe 202, a mounting hole 4 is formed in the case, one side of the case where the mounting hole 203 is located is a mounting portion 3, the mounting hole 4 is a stepped hole, the mounting hole is a first hole 41 and a second hole 42 in sequence from the inside to the outside of the case, the first hole is larger than the second hole, the connection pipe 202 passes through the mounting hole from the inside to the outside of the case, the base 201 is inserted into the first hole 41, the connection pipe 202 is inserted into the second hole 42, an external thread is formed on the connection pipe 202, a portion provided with the external thread is outside of the case, the dissolution assembly further includes a nut 8, the nut 8 is provided with an internal thread matching the external thread on the connection pipe 202, the connection pipe 202 and the nut are tightly connected through the thread, so as to fix the dissolution assembly on the case. In this embodiment, the dissolving mechanism is a polymethyl methacrylate sheet with one surface covered with a polypropylene film, the thickness of the polymethyl methacrylate sheet is 2mm, the thickness of the polypropylene film is 0.1mm, the polypropylene film is completely covered on the surface of the polymethyl methacrylate opposite to the inside of the housing, a supporting table 9 is arranged in the connecting pipe, the dissolving mechanism is arranged on the supporting table and seals the through hole 7, the dissolving mechanism further comprises a pressing part 10 with a hollow inside, the pressing part presses the dissolving mechanism 203 to be fixed on the supporting table and is connected with the connecting pipe in a sealing manner, the connecting manner can be a threaded connection or a clamping connection, an adhesive manner and the like, and a cavity formed inside the housing is sealed and isolated from the outside of the battery housing.

When the battery shell is in a natural state, the inside and the outside of the battery shell are sealed and isolated, the battery shell is placed in external electrolyte, or when the electrolyte is injected into a connecting pipe of a dissolving assembly, the electrolyte contacts a polymethacrylate sheet through the connecting pipe, the polymethacrylate gradually dissolves and disappears, under the action of fluid, the polypropylene film moves, the connecting pipe is not sealed any more, the inside and the outside of the battery shell are communicated, and the electrolyte flows into the battery shell through the connecting pipe.

In another embodiment, the dissolving assembly further comprises a sealing gasket 6, which is arranged between the base 201 and the mounting portion 3 and seals the joint between the nut and the housing.

In another embodiment, the dissolving assembly further comprises a sealing ring 5, which is arranged between the base 201 and the mounting portion 3, so that the joint of the base and the shell is sealed.

Example 3

As shown in fig. 4 and fig. 5, the present embodiment provides a large capacity battery, including a square battery 12 and a multi-branch liquid storage pipeline 11, the case of the square battery is the battery case having a dissolution mechanism in embodiment 1 or embodiment 2, the multi-branch liquid storage pipeline includes a main pipeline 110 and a plurality of branch pipelines 111, there is a liquid storage cavity 112 in the main pipeline 110, electrolyte is contained in the liquid storage cavity 112, the branch pipelines 111 and a connection pipe 202 of the battery are connected in a one-to-one correspondence manner, because a dissolution mechanism is arranged in the connection pipe, when electrolyte is injected into the liquid storage pipeline, electrolyte enters into each square battery through the main pipeline 110 and the branch pipelines 111, because there is a dissolution mechanism at the connection pipe of the square battery, a dissolution piece in the dissolution mechanism is dissolved by the electrolyte and disappears gradually, a protective film is under the action of electrolyte fluid, no longer seals the connection pipe, the electrolyte flows into the square battery, and then enters into the inside of each battery, because electrolyte is contained in the liquid storage cavity 112, both the square battery and the liquid storage cavity are in a common electrolyte system, performance difference caused by different electrolyte consumption of each battery is reduced, and the large capacity battery has good uniformity.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A prismatic battery case is characterized by comprising a mounting part and a dissolving component,

the mounting part is provided with a mounting hole which penetrates through the shell,

the dissolving assembly comprises a base, a connecting pipe protruding out of the base and a dissolving mechanism, a through hole communicated with the connecting pipe is formed in the base, the dissolving mechanism is arranged in the connecting pipe, and the dissolving mechanism seals the connecting pipe;

the connecting pipe penetrates through the mounting hole from the inside to the outside of the shell, and the base is mounted on the mounting part in a sealing manner;

2. The square battery shell according to claim 1, wherein the mounting hole is a stepped hole, the stepped hole is provided with a first hole and a second hole from the inside to the outside of the shell in sequence, the diameter of the first hole is larger than that of the second hole, the base is inserted into the first hole, and the connecting pipe is inserted into the second hole.

3. The square battery shell according to claim 1 or 2, wherein the dissolution assembly further comprises a nut, the connecting pipe is provided with an external thread matching with the nut, and the nut is arranged outside the shell and connected with the external thread of the connecting pipe.

4. The prismatic cell casing according to claim 3, wherein the dissolution assembly further comprises a sealing gasket disposed between the mounting portion and the nut.

5. The prismatic battery housing of claim 3, wherein the lysing assembly further comprises a sealing ring disposed between the base and the mounting portion.

6. The prismatic battery case according to claim 1, wherein said dissolution mechanism comprises a dissolution piece soluble in the electrolyte and a protective film insoluble in the electrolyte, said protective film being provided on a surface of said dissolution piece opposite to the inside of said case, and sealing said case.

7. The prismatic cell casing according to claim 1, wherein a support platform is provided in the connection tube, and the dissolution mechanism is disposed on the support platform to seal the connection tube.

8. The prismatic battery casing according to claim 7, wherein the dissolution assembly further comprises a pressing member, the pressing member presses and fixes the dissolution mechanism, the pressing member is hollow inside, and is communicated with the connection pipe and tightly connected with the connection pipe.

9. The prismatic battery case according to claim 8, wherein the pressing member is provided with an external thread, the connection pipe is provided with an internal thread matching with the external thread, and the connection pipe is tightly connected with the pressing member by a thread.

10. The square battery case according to claim 6, wherein the dissolving sheet is made of one of polymethyl methacrylate, silicone rubber, polyvinyl chloride, polycarbonate or ABS plastic.

11. The prismatic battery case according to claim 6, wherein the dissolving sheet is a polymethylmethacrylate sheet.

12. The prismatic battery case according to claim 6, wherein the dissolving sheet has a thickness of not more than 2mm.

13. The prismatic battery case according to claim 6, wherein the protective film is less than 0.1mm thick.

14. A prismatic battery comprising a battery case according to any one of claims 1 to 13, an electrode assembly disposed in the case, and a cap assembly sealing the case.

15. A large capacity battery comprising at least two square batteries according to claim 14 and a multi-branch reservoir comprising a main pipe and at least two branch pipes, wherein the main pipe has a reservoir chamber therein for containing an electrolyte, and the branch pipes are connected to the connection pipes in a one-to-one correspondence to communicate the reservoir pipes with the square batteries.

16. A large capacity battery as recited in claim 15, wherein a butt joint member is provided between the square battery connection tube and the branch tube to communicate the connection tube and the branch tube.