CN219163621U

CN219163621U - Explosion-proof valve structure, energy storage unit and power device

Info

Publication number: CN219163621U
Application number: CN202223178491.8U
Authority: CN
Inventors: 夏天军; 刘静; 高飞; 张放南; 杨红新
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-06-09
Anticipated expiration: 2032-11-28

Abstract

The utility model relates to the technical field of batteries and discloses an explosion-proof valve structure, an energy storage unit and a power device, wherein the energy storage unit and the power device are respectively provided with the explosion-proof valve structure; the explosion-proof valve structure comprises a first fixing part, a second fixing part and an explosion-proof part; the first fixing part is provided with a first diversion channel; the first fixing part is connected to the cover plate of the battery cell, and the first diversion channel is used for communicating the inside of the battery cell with the outside; the second fixing part is connected with the first fixing part and is provided with a second diversion channel communicated with the first diversion channel; the explosion-proof component is connected in the second diversion channel; the second fixing part is connected to the cover plate through the first fixing part, so that the indirect installation of the explosion-proof part and the cover plate is realized, the material of the cover plate is not limited, the suitability is stronger, the cover plate made of different materials can be applied, the problem that the cover plate is difficult to install the explosion-proof part with higher sensitivity due to the limitation of the material is solved, the opening pressure is reduced, and the safety is improved.

Description

Explosion-proof valve structure, energy storage unit and power device

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to an explosion-proof valve structure.

Background

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

The traditional lithium battery generally forms a sealed cavity through welding a shell and a top cover, the battery core assembly is sealed in the cavity to protect the battery core assembly, and then internal and external circuits are used for conveying internal current of the battery to the outside through a top cover pole, so that the diversion effect is achieved; however, when the battery cell assembly is excessively used, the temperature is increased, gas is generated after the battery cell assembly reaches a certain temperature, the pressure in the cavity is increased until the casing is exploded, the battery is scrapped, and the risk is high. In order to avoid such a situation, an explosion-proof valve is generally installed on the top cover, and when the pressure in the shell increases to a certain extent, the explosion-proof valve is broken, so that the explosion of the battery is directionally erupted, and the risk of explosion of the battery is reduced.

Currently, the explosion pressure of the explosion-proof valve is usually less than 2.0Mpa (most commonly 0.6-1.2 Mpa), and in order to achieve a lower opening pressure, the explosion-proof valve is required to be made of a softer metal material, usually 1-series aluminum or 3-series aluminum.

The existing aluminum shell battery structure is characterized in that the explosion-proof valve is arranged in a mode that a groove is punched on a light aluminum sheet of the top cover, then the explosion-proof valve is placed in the groove for laser welding and fixing, and an explosion-proof effect is achieved.

Disclosure of Invention

The utility model aims to provide an explosion-proof valve structure, which solves the technical problem that the suitability of an explosion-proof valve of a battery is insufficient due to the material problem.

In order to solve the technical problems, the specific technical scheme of the utility model is as follows:

in some embodiments of the present application, there is provided an explosion-proof valve structure including:

the first fixing part is provided with a first diversion channel; the first fixing part is connected to the cover plate of the battery cell, and the first diversion channel is used for communicating the interior of the battery cell with the outside;

the second fixing part is connected with the first fixing part and is provided with a second diversion channel communicated with the first diversion channel;

and the explosion-proof component is connected in the second diversion channel and is used for explosion-proof pressure relief of the battery cell.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, a mounting groove is formed at the top of the second diversion channel; the explosion-proof component is arranged in the mounting groove and seals the first diversion channel and the second diversion channel.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the explosion-proof valve further includes a protection component, and the protection component is attached to a top plane of the second diversion channel and covers a contact surface between the explosion-proof component and the outside.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the protection component is an explosion-proof valve patch.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, a first connecting portion and a second connecting portion are respectively disposed on the outer side and the inner side of the first fixing member; the first connecting part is clamped with the cover plate, and the second connecting part is connected with the second fixing part.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, a third connecting portion is disposed on an outer side of the second fixing member, and is connected to the second connecting portion through the third connecting portion.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, a surface of the cover plate contacting the first connecting portion and/or a surface of the third connecting portion contacting the second connecting portion are formed with nanopores through nano-processing.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the first fixing member is an injection molded structure, the second fixing member and the cover plate are fixed on a mold, and the first fixing member is injection molded.

Compared with the prior art, the utility model has the beneficial effects that:

the explosion-proof component is fixed on the second fixing component, the second fixing component is connected to the cover plate of the battery cell through the first fixing component, and the indirect installation of the explosion-proof component and the cover plate is realized.

Drawings

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

FIG. 1 is a perspective view of an embodiment of the present utility model;

FIG. 2 is a top view of an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is an enlarged schematic view at B in FIG. 3;

FIG. 5 is an exploded view of an embodiment of the present utility model;

FIG. 6 is a schematic view of an explosion-proof component provided in an embodiment of the present utility model;

FIG. 7 is a schematic view of a first fixing member according to an embodiment of the present utility model;

fig. 8 is a schematic view of a second fixing component according to an embodiment of the present utility model.

In the figure:

1. an explosion-proof valve structure; 10. a first fixing member; 100. a first diversion channel; 101. a first connecting part; 102. a second connecting part; 11. a second fixing member; 110. a second diversion channel; 111. a mounting groove; 112. a third connecting part; 12. an explosion-proof member; 120. a blasting tank; 13. a protective member; 2. a cover plate; 3. and (5) a plastic part.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

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

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The present utility model will be described in further detail with reference to the accompanying drawings for a better understanding of the objects, structures and functions of the present utility model.

Referring to fig. 1-8, an explosion-proof valve structure according to an embodiment of the present application is described, comprising: a first fixing part 10, a second fixing part 11 and an explosion-proof part 12;

the first fixing part 10 is provided with a first diversion channel 100; the first fixing part 10 is connected to the cover plate 2 of the battery cell, and the first diversion channel 100 communicates the interior of the battery cell with the outside; the second fixing part 11 is connected with the first fixing part 10 and is provided with a second diversion channel 110 communicated with the first diversion channel 100; the explosion-proof component 12 is connected in the second diversion channel 110, seals the first diversion channel 100 and the second diversion channel 110, and is used for explosion-proof pressure relief of the battery cell.

It should be noted that, the cover plate 2 may be a top cover of the electric core, the top cover is a photo-aluminum sheet, and through holes for installing the polar posts and the explosion-proof valve structure 1 are arranged on the top cover, wherein the lower polar post passes through the through holes on the photo-aluminum sheet to be connected with the upper polar post in a riveting manner, and then laser welding is performed along the riveting edge, so that the connection internal resistance is effectively reduced; insulating protection is carried out between the aluminum sheet and the lower and upper polar posts through plastic parts 3, and the tightness of the contact position between the polar posts and the aluminum sheet through holes is realized through a sealing ring; the explosion-proof valve structure 1 is connected at the corresponding through hole position.

In the above scheme, the explosion-proof component 12 is fixed on the fixing component two 11, the fixing component two 11 is connected on the cover plate 2 through the fixing component one 10, and the indirect installation of the explosion-proof component 12 and the cover plate 2 is realized, and as the fixing component one 10, the fixing component two 11 and the cover plate 2 are installed in a clamping way, the material of the cover plate 2 is not limited, the suitability is stronger, the explosion-proof component can be applied to the cover plates 2 with different materials, the problem that the cover plate 2 is limited by materials and the explosion-proof component 12 with higher installation sensitivity is difficult to install is solved, the opening pressure is reduced, and the safety is improved.

In the preferred embodiment of the present application, the top of the second diversion channel 110 is provided with a mounting groove 111; the explosion-proof component 12 is disposed in the mounting groove 111 to seal the first diversion channel 100 and the second diversion channel 110.

In the preferred embodiment of the present application, the first fixing part 10 is of injection molding structure, the second fixing part 11 and the cover plate 2 are fixed on a mold, and the first fixing part 10 is formed by injection molding

Specifically, the first fixing part 10 is of a tubular structure, the pipeline cavity is a first diversion channel 100, the outer side and the inner side of the pipeline cavity are respectively provided with a first connecting part 101 and a second connecting part 102, and the first connecting part 101 and the second connecting part 102 are annular grooves with stepped sections; the first connecting part 101 is clamped with the cover plate 2, and the second connecting part 102 is connected with the second fixing part 11.

Specifically, the second fixing part 11 is of an annular structure, the inner ring channel is a second diversion channel 110, the top of the inner ring surface of the inner ring channel is provided with a mounting groove 111, the explosion-proof part 12 is arranged in the mounting groove 111, the outer side of the second fixing part 11 is provided with a third connecting part 112, and the third connecting part 112 is of a step structure matched with the second connecting part and is connected with the second connecting part 102 through the third connecting part 112.

Specifically, the surface of the cover plate 2 contacted with the first connecting part 101 and/or the surface of the third connecting part 112 contacted with the second connecting part 102 are formed with nano holes through nano treatment, and the first fixing part 10 is connected with the cover plate 2 and the second fixing part 11 into a whole through a nano injection molding technology; the nano injection molding technology is used for realizing the connection of the first fixing part 10, the second fixing part 11 and the cover plate 2, so that the sealing effect can be realized while the falling-off can be prevented.

Specifically, the surface of the cover plate 2 in contact with the first connection portion 101 and the surface of the third connection portion 112 in contact with the second connection portion 102 are subjected to nano-treatment to form nano-pores.

Specifically, the explosion-proof component 12 is of a circular plate structure, the top of the explosion-proof component is provided with a groove, the position, close to the edge, of the bottom of the groove is cut to form an incomplete annular explosion groove 120, the explosion-proof component is used for reducing the strength of the bottom plate, the internal pressure is convenient to explode outwards at the position, and the sensitivity of the explosion-proof component is enhanced.

In the preferred embodiment of the present application, the protection component 13 is further included, where the protection component 13 is attached to the top plane of the second diversion channel 110, and covers the contact surface between the explosion-proof component 12 and the outside.

Specifically, the protection member 13 is an explosion-proof valve patch, and may be a PET film, and is attached to the top plane of the mounting groove 111.

Specifically, the middle part of explosion-proof valve paster is opened there is the through-hole.

Through above-mentioned technical scheme, the technical effect that this application can reach lies in, can prevent that the foreign matter from extrudeing explosion-proof part 12 through pasting the explosion-proof valve paster, leads to explosion-proof part 12 to warp, influences explosion-proof part 12 opening pressure's stability, promotes the security.

Specifically, the first fixing member 10 is PPS or LCP; the second fixing part 11 and the explosion-proof part 12 can be prepared from 1 series aluminum or 3 series aluminum, and the tightness can be ensured by laser welding between the structures.

Specifically, the assembly method of the embodiment of the application is as follows:

step one: the corresponding surfaces of the second fixing part 11 and the cover plate 2 are subjected to nanometer treatment;

step two: the explosion-proof component 12 is welded with the second fixing component 11 by laser;

step three: the second fixing part 11 and the cover plate 2 are installed and fixed on an injection mold;

step four: injection molding the fixed part I10 by an injection molding machine;

step five: a sticking prevention member 13;

step six: the plastic part 3 is fixed on the cover plate 2 by means of double-sided adhesive tape or hot melting.

In another embodiment of the present application, an energy storage unit is described comprising the explosion proof valve structure 1 of the above embodiment.

In another embodiment of the present application, a power plant is described comprising the energy storage unit of the above embodiment.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An explosion-proof valve structure, characterized by comprising:

a first fixing part (10) provided with a first diversion channel (100); the first fixing part (10) is connected to the cover plate (2) of the battery cell, and the first diversion channel (100) is used for communicating the interior of the battery cell with the outside;

a second fixing part (11) connected to the first fixing part (10) and provided with a second diversion channel (110) communicated with the first diversion channel (100);

and the explosion-proof component (12) is connected in the second diversion channel (110) and is used for explosion-proof pressure relief of the battery cell.

2. An explosion-proof valve structure according to claim 1, wherein the top of the second diversion channel (110) is provided with a mounting groove (111); the explosion-proof component (12) is arranged in the mounting groove (111) and seals the first diversion channel (100) and the second diversion channel (110).

3. An explosion-proof valve structure according to claim 1, further comprising a protection component (13), wherein the protection component (13) is attached to the top plane of the second diversion channel (110) and covers the contact surface of the explosion-proof component (12) with the outside.

4. A valve structure according to claim 3, characterized in that the protective member (13) is a valve patch.

5. The explosion-proof valve structure according to claim 1, wherein the outer side and the inner side of the first fixing member (10) are respectively provided with a first connecting portion (101) and a second connecting portion (102); the first connecting part (101) is clamped with the cover plate (2), and the second connecting part (102) is connected with the second fixing part (11).

6. The explosion-proof valve structure according to claim 5, wherein a third connecting portion (112) is provided on the outer side of the second fixing member (11), and is connected to the second connecting portion (102) through the third connecting portion (112).

7. The explosion-proof valve structure according to claim 6, wherein the surface of the cover plate (2) contacting the first connecting part (101) and/or the surface of the third connecting part (112) contacting the second connecting part (102) are formed with nanopores by nano-treatment.

8. An explosion-proof valve structure according to claim 7, wherein the first fixing part (10) is an injection molded structure, the second fixing part (11) and the cover plate (2) are fixed on a mold, and the first fixing part (10) is formed by injection molding.

9. An energy storage unit, characterized by comprising an explosion-proof valve structure (1) according to any of the preceding claims 1-8.

10. A power plant comprising an energy storage unit according to claim 9.