CN216133957U

CN216133957U - Battery liquid injection structure

Info

Publication number: CN216133957U
Application number: CN202121795106.7U
Authority: CN
Inventors: 张三学; 雷政军; 翟腾飞; 刘毅; 郑高锋
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-03-25
Anticipated expiration: 2031-08-03

Abstract

The application discloses liquid structure is annotated to battery, including setting up the multi-functional mouth of pipe on the liquid hole is annotated to the battery, with the tee junction pipe that multi-functional mouth of pipe is connected, with the notes liquid structure that tee junction pipe connects, with the evacuation structure that tee junction pipe connects. This application only needs to open a hole on battery case, just can realize evacuation, notes liquid, let out and explode the function, and simple structure does benefit to the sealed of battery. In addition, the structure can realize vacuum pumping while injecting liquid, and is favorable for smooth injection of electrolyte.

Description

Battery liquid injection structure

Technical Field

The application relates to the technical field of lithium batteries, in particular to a vacuumizing, liquid injection and explosion venting structure for a large battery.

Background

The lithium battery generally comprises a shell and a cover body fixed on the shell, wherein the cover body is generally provided with an exhaust hole, a vacuum pumping hole and a liquid injection hole, and the cover body is also welded with an explosion venting film for the safety of the battery. These holes and the welded structure have a certain influence on the sealing reliability of the battery. When the battery is used, if the electrolyte overflows through the holes and the welded structure, the energy and the service life of the battery can be influenced, the electrolyte belongs to flammable substances, and the overflowing electrolyte can generate fire hazards.

Patent No. CN201510851791.3, a battery annotates the liquid and uses the relief valve, including the valve block, the valve block is covered with the body through the whorl, the said valve block is fitted with the unidirectional film through the clamp plate in vivo, still open the air vent on the valve block, open and annotate the liquid hole on valve block and body; the exhaust hole is formed in the side face of the valve body; an O-shaped ring is arranged in the shell. However, the safety valve has no vacuumizing function, and electrolyte is easy to spill out during injection.

Patent No. CN102208584B, a liquid injection and safety dual-purpose valve for lithium ion batteries, comprising a valve body and a valve core, wherein a top cover is connected with the top end of the valve body, the inner wall of the cylindrical part of the valve body is tapped with threads, and the center of the bottom cover part is provided with a liquid injection hole along the axial direction; the gland is arranged in the cylindrical part of the valve body, and is provided with a primary exhaust hole along the axial direction, and the bottom surface is provided with a groove; the top cover is provided with a secondary vent hole along the axial direction, and a cylindrical electrolyte absorption pad is arranged between the top cover and the gland; the valve core is arranged between the groove of the gland and the liquid injection hole. The deformation of the rubber valve core is difficult to calculate, the processing is difficult to realize, and the explosion venting effect is not ideal.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

the application provides a liquid structure is annotated to battery, including setting up the multi-functional mouth of pipe on the liquid hole is annotated to the battery, with the tee junction pipe that multi-functional mouth of pipe is connected, with the notes liquid structure that tee junction pipe connects, with the evacuation structure that tee junction pipe connects.

Further, in the embodiment provided by the application, the device comprises a conduit, wherein the upper end of the conduit is connected with a liquid injection structure, and the lower end of the conduit penetrates through a three-way connecting pipe and a multifunctional pipe orifice to be deeply arranged in a battery; wherein, the outer diameter of the conduit is smaller than the inner diameter of the three-way connecting pipe.

Further, in the embodiments provided in the present application, the liquid injection structure and the vacuum pumping structure are valve body structures, or quick connectors.

Further, in the embodiments provided in the present application, a explosion venting structure is included.

Further, in the embodiments provided by the present application, the three-way connecting pipe may also be replaced by a four-way connecting pipe; and the four-way connecting pipe is also provided with an explosion venting structure.

Further, in the embodiments provided in the present application, the explosion venting structure includes an explosion venting joint connected to the four-way connection pipe and an explosion venting film disposed on the explosion venting joint, or the explosion venting structure includes an explosion venting joint connected to the four-way connection pipe and a fusible metal block disposed on the explosion venting joint.

Further, in the examples provided herein, the fusible metal block has a melting point of greater than 200 ℃.

Further, in the embodiments provided in the present application, the explosion venting structure includes an explosion venting joint connected to the four-way connecting pipe and an explosion venting valve disposed on the explosion venting joint.

Compared with the prior art, the method has the following beneficial effects:

the structure can realize the functions of vacuumizing, liquid injection and explosion venting only by opening a hole on the battery shell, has simple structure and is beneficial to sealing of the battery. In addition, the structure can realize vacuum pumping while injecting liquid, and is favorable for smooth injection of electrolyte.

Additional advantages, objects, and features of the application 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 application.

Drawings

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

Fig. 1 is a schematic view of an integrated structure of vacuum pumping and liquid injection.

FIG. 2 is a schematic view of an integrated structure of vacuum pumping, liquid injection and explosion venting.

Fig. 3 is a schematic view of the explosion venting structure of the explosion venting membrane.

Fig. 4 is a schematic diagram of a fusible metal explosion venting structure.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation.

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.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the embodiment of the present application provides a battery liquid injection structure, including a multifunctional pipe orifice 5 arranged on a battery liquid injection hole, a three-way connection pipe 3 connected with the multifunctional pipe orifice 5, a liquid injection structure 1 connected with the three-way connection pipe 3, and a vacuum pumping structure 2 connected with the three-way connection pipe 3.

Further, in the embodiment provided by the application, the liquid injection device comprises a conduit 4, the upper end of the conduit 4 is connected with the liquid injection structure 1, and the lower end of the conduit 4 penetrates through the three-way connecting pipe 3 and the multifunctional pipe orifice 4 and is deeply arranged in the battery; wherein, the outer diameter of the conduit is smaller than the inner diameter of the three-way connecting pipe.

Further, in the embodiments provided in the present application, the liquid injection structure 1 and the vacuum pumping structure 2 are valve body structures, or quick joints.

As shown in fig. 2, in the embodiment provided by the present application, the three-way connection pipe 3 can be replaced by a four-way connection pipe 9; the four-way connecting pipe 9 is connected with an explosion venting structure.

As shown in fig. 3, the explosion venting structure comprises an explosion venting joint 6 connected with a four-way connecting pipe 9 and an explosion venting membrane 7 arranged on the explosion venting joint;

as shown in fig. 4, the explosion venting structure comprises an explosion venting joint 6 connected with a four-way connecting pipe 9 and a fusible metal block 8 arranged on the explosion venting joint.

Further, in the examples provided herein, the fusible metal block 8 has a melting point of greater than 200 ℃.

Example 1

As shown in fig. 1 and 3, the liquid injection structure 1 is perpendicular to the vacuum pumping structure 2, the liquid injection structure 1 and the vacuum pumping structure are connected into a whole through a three-way connecting pipe 3, the liquid injection structure 1 is connected with a conduit 4, the conduit 4 goes deep into the battery shell through the three-way connecting pipe 3, and the three-way connecting pipe 3 is in threaded connection with the multifunctional pipe orifice 5. The liquid injection and the vacuum pumping of the structure body are simultaneously carried out, so that the electrolyte splashing and the liquid injection difficulty are avoided.

After liquid injection is completed, the liquid injection and vacuumizing integrated structure is screwed out, the explosion venting connector 6 is in threaded connection with the multifunctional pipe orifice, when the internal pressure of the battery is greater than an explosion venting threshold value in the use process of the battery, the explosion membrane is broken, and electrolyte and reaction substances inside the battery are discharged through the explosion venting pipe orifice.

Example 2

As shown in fig. 2 to 4, the liquid injection structure 1 is perpendicular to the vacuum pumping structure 2, and is connected with the explosion venting structure into a whole through a four-way connecting piece 9. The connecting body is in threaded connection with the multifunctional pipe orifice 5. Annotate liquid and evacuation and go on simultaneously, annotate liquid structure 1 and vacuum structure 2 and all have self-locking function, annotate the liquid and accomplish the back, seal by oneself. In the use process of the battery, when the internal temperature of the battery is greater than the explosion venting threshold value, the fusible metal block 8 is melted, the explosion venting structure is opened, and the electrolyte and the reaction substances in the battery are discharged through the explosion venting pipe orifice.

Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and the embodiments. It can be applied in all kinds of fields suitable for the present application. Additional modifications will readily occur to those skilled in the art. Therefore, the application is not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. The utility model provides a liquid structure is annotated to battery, its characterized in that, including the multi-functional mouth of pipe that sets up on battery notes liquid hole, with the tee junction pipe that multi-functional mouth of pipe is connected, with the notes liquid structure that tee junction pipe connects, with the evacuation structure that tee junction pipe connects.

2. The battery liquid injection structure according to claim 1, comprising a conduit, wherein the upper end of the conduit is connected with the liquid injection structure, and the lower end of the conduit passes through the three-way connecting pipe and the multifunctional pipe orifice and is inserted into the battery;

wherein, the outer diameter of the conduit is smaller than the inner diameter of the three-way connecting pipe.

3. The battery electrolyte injection structure according to claim 2, wherein the electrolyte injection structure and the vacuum structure are valve structures or quick connectors.

4. The battery electrolyte injection structure of claim 1, comprising a venting structure.

5. The battery electrolyte injection structure according to claim 4, wherein the three-way connection pipe can be replaced by a four-way connection pipe;

the four-way connecting pipe is also connected with an explosion venting structure.

6. The battery electrolyte injection structure according to claim 5, wherein the explosion venting structure comprises an explosion venting connector connected with the four-way connecting pipe, and an explosion venting membrane arranged on the explosion venting connector.

7. The battery electrolyte injection structure according to claim 5, wherein the explosion venting structure comprises an explosion venting connector connected with the four-way connecting pipe, and a fusible metal block arranged on the explosion venting connector.

8. The battery electrolyte injection structure of claim 7, wherein said fusible metal block has a melting point greater than 200 ℃.

9. The battery liquid injection structure according to claim 5, wherein the explosion venting structure comprises an explosion venting connector connected with the four-way connecting pipe, and an explosion venting valve arranged on the explosion venting connector.