CN219163620U - Explosion-proof valve structure, energy storage unit and power device - Google Patents

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 and a limiting part, and the first diversion channel penetrates through a cover plate of the battery cell; the second fixing part is connected to the penetrating end of the first diversion channel and is provided with a second diversion channel communicated with the first diversion channel; the second fixing part and the limiting part can form a limiting structure, and the first fixing part and the second fixing part are limited on the cover plate; the explosion-proof component is connected to the fixing component II, the indirect installation with the cover plate is realized through the fixing component I and the fixing component II, the suitability of the material for the cover plate is stronger, the explosion-proof component can be applied to the steel cover plate, the problem that the cover plate is difficult to install the explosion-proof component with higher sensitivity due to material limitation 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 component is provided with a first diversion channel, one end of the first diversion channel penetrates through the cover plate of the battery cell, and the other end of the first diversion channel is provided with a limiting component;

the second fixing part is connected to the penetrating end of the first diversion channel and is provided with a second diversion channel communicated with the first diversion channel; the second fixing part and the limiting part can form a limiting structure, and the first fixing part and the second fixing part are clamped on the cover plate;

and the explosion-proof component is connected with the second fixing component and is used for explosion-proof pressure relief of the battery cell.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the second diversion channel is provided with a mounting groove; 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 the top plane of the second diversion channel to seal the mounting groove.

Preferably, in the preferred embodiment of the explosion-proof valve structure, the gap distance between the top plane of the explosion-proof component and the lower surface of the protection component is more than or equal to 0.5mm;

and/or the gap distance between the bottom plane of the explosion-proof component and the upper surface of the first diversion channel is more than or equal to 0.2mm.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the explosion-proof valve further includes a limiting seal assembly disposed between the limiting member and the second fixing member, and abutting and fixing the cover plate.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the limiting seal assembly includes:

the sealing component is sleeved outside the first fixing component, and the bottom and the top of the sealing component are respectively in butt joint and seal with the top of the limiting component and the inner wall of the cover plate;

and the insulating part is sleeved outside the first fixing part, and the bottom and the top of the insulating part are respectively in butt joint and seal with the outer wall of the cover plate and the bottom plane of the second fixing part.

Preferably, in a preferred embodiment of the above explosion-proof valve structure, the first fixing member and/or the second fixing member and/or the explosion-proof member are/is made of the same material, and are fixed by welding.

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

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

according to the scheme, the first fixing part and the second fixing part are fixed on the cover plate of the battery cell, then the explosion-proof part is fixed on the second fixing part, the indirect installation of the explosion-proof part and the cover plate is realized, and the first fixing part and the second fixing part are in a clamping structure with the cover plate, so that the cover plate is not limited in material, strong in adaptability and capable of being applied to cover plates of different materials, the problem that the cover plate is difficult to install the explosion-proof part with higher sensitivity due to material limitation is solved, the opening pressure is reduced, and the safety is improved.

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 limiting member; 101. a first diversion channel; 11. a second fixing member; 110. a second diversion channel; 111. a mounting groove; 12. an explosion-proof member; 120. a blasting tank; 13. a protective member; 14. a sealing member; 15. an insulating member; 2. and a cover plate.

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:

the battery cell comprises a first fixing part 10, a second fixing part 11 and an explosion-proof part 12, wherein the first fixing part 10 is provided with a first diversion channel 101, one end of the first diversion channel 101 penetrates through a cover plate 2 of the battery cell, and the other end of the first diversion channel is provided with a limiting part 100; the second fixing part 11 is connected to the penetrating end of the first diversion channel 101 and is provided with a second diversion channel 110 communicated with the first diversion channel 101; the second fixing part 11 and the limiting part 100 form a limiting structure, and the first fixing part 10 and the second fixing part 11 are limited on the cover plate 2; the explosion-proof component 12 is connected to the second fixing component 11 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, and the tightness of the contact position between the polar post and the aluminum sheet through hole is realized through a sealing ring; the explosion-proof valve structure 1 is clamped at the corresponding through hole position.

In the above scheme, through fixing the first fixing part 10 and the second fixing part 11 on the cover plate 2 of the battery cell, fixing the explosion-proof part 12 on the second fixing part 11, communicating the first diversion channel 101 and the second diversion channel 110 with the explosion-proof part 12, realizing indirect installation of the explosion-proof part 12, because the first fixing part 10 and the second fixing part 11 are in clamping structures with the cover plate 2, the material of the cover plate 2 is not limited, the adaptability is stronger, the cover plate can be applied to the steel cover plate 2, the problem that the cover plate 2 is difficult to install the explosion-proof part 12 with higher sensitivity due to material limitation is solved, the opening pressure is reduced, and the safety is improved.

In the preferred embodiment of the present application, 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 101 and the second diversion channel 110.

Specifically, the first fixing member 10 has a tubular structure, the conduit cavity is a first diversion channel 101, and an annular limiting member 100 is disposed at the bottom outer side of the conduit cavity.

Specifically, the second fixing member 11 has an annular structure, the inner annular channel is a second diversion channel 110, and the top of the inner annular surface is provided with a mounting groove 111.

Specifically, the explosion-proof component 12 has a circular plate structure, the top of the explosion-proof component is provided with a groove, the bottom of the groove is cut at a position close to the edge to form an incomplete circular ring-shaped explosion groove 120, so that the strength of the bottom plate is reduced, the internal pressure is conveniently exploded outwards at the position, and the sensitivity of the explosion-proof component 12 is enhanced.

Specifically, the mounting groove 111 is a stepped groove, the top of the first fixing part 10 penetrates into the second fixing part 11, and the top plane is flush with the bottom step surface of the stepped groove; the explosion-proof member 12 is mounted on the middle step surface of the step groove, and its top plane is flush with the upper step surface.

Specifically, the gap distance between the bottom plane of the explosion-proof component 12 and the upper surface of the first diversion channel 101 is more than or equal to 0.2mm.

In the preferred embodiment of the present application, the protection component 13 is further included, and the protection component 13 is attached to the top plane of the second diversion channel 110 to seal the mounting groove 111.

Specifically, the explosion-proof component 12 is an explosion-proof valve patch, and can be a film made of PET material and attached to the step surface at the top of the step groove.

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 gap distance between the top plane of the explosion-proof member 12 and the lower surface of the protection member 13 is not less than 0.5mm.

In the preferred embodiment of the present application, the sealing device further comprises a limiting sealing assembly, which is disposed between the limiting component 100 and the second fixing component 11 and is in abutting connection with and fixed to the cover plate 2.

Specifically, the limit seal assembly includes:

the sealing component 14 is sleeved outside the first fixing component 10, and the bottom and the top of the sealing component are respectively in butt seal with the top of the limiting component 100 and the inner wall of the cover plate 2;

the insulating member 15 is sleeved outside the first fixing member 10, and the bottom and the top of the insulating member are respectively in contact and seal with the outer wall of the cover plate 2 and the bottom plane of the second fixing member 11.

Specifically, the sealing member 14 may be a sealing ring made of fluororubber.

Specifically, the insulating member 15 may be an insulating pad made of PPS or LCP.

Through the technical scheme, insulation and sealing between the explosion-proof valve structure 1 and the cover plate 2 can be realized, and the performance of the explosion-proof valve structure is ensured.

In the preferred embodiment of the present application, the first fixing member 10 and/or the second fixing member 11 and/or the explosion-proof member 12 are made of the same material, and are fixed by welding.

Specifically, the first fixing part 10, the second fixing part 11 and the explosion-proof part 12 can be made of 1-series aluminum or 3-series aluminum, and the sealing performance 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 sealing part 14 is sleeved on the first fixing part 10 and is limited by the limiting part 100;

step two: the top end of the first fixing part 10 sequentially passes through the cover plate, the insulating part 15 and the second fixing part 11;

step three: the top plane of the first fixing part 10 is flush with the bottom step surface of the second fixing part 11, and is fixed by laser welding;

step four: the explosion-proof component 12 is placed on the middle step surface of the second fixing component 11, the upper surface of the explosion-proof component 12 is flush with the step surface of the upper layer, the explosion-proof component 12 is fixed by laser welding, and the gap between the lower surface of the explosion-proof component 12 and the step surface at the bottom of the welding ring is more than or equal to 0.2mm;

step five: the anti-explosion part 13 is stuck on the step surface at the top of the fixed part, and the gap between the upper surface of the anti-explosion part 12 and the lower surface of the anti-explosion part 13 is more than or equal to 0.5mm.

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 (10)

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

the first fixing part (10) is provided with a first diversion channel (101), one end of the first diversion channel (101) penetrates through the cover plate (2) of the battery cell, and the other end of the first diversion channel is provided with a limiting part (100);

a second fixing component (11) connected to the penetrating end of the first diversion channel (101) and provided with a second diversion channel (110) communicated with the first diversion channel (101); the second fixing part (11) and the limiting part (100) can form a limiting structure, and the first fixing part (10) and the second fixing part (11) are clamped on the cover plate (2);

and the explosion-proof component (12) is connected with the second fixing component (11) and is used for explosion-proof pressure relief of the battery cell.

2. An explosion-proof valve structure according to claim 1, wherein 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 (101) and the second diversion channel (110).

3. An explosion-proof valve structure according to claim 2, further comprising a protection member (13), wherein the protection member (13) is attached to a top plane of the second diversion channel (110) to seal the mounting groove (111).

4. An explosion-proof valve structure according to claim 3, wherein the gap distance between the top plane of the explosion-proof component (12) and the lower surface of the protection component (13) is more than or equal to 0.5mm;

and/or the clearance distance between the bottom plane of the explosion-proof component (12) and the upper surface of the first diversion channel (101) is more than or equal to 0.2mm.

5. The explosion-proof valve structure according to claim 1, further comprising a limiting seal assembly disposed between the limiting member (100) and the second fixing member (11) and abutting against and fixed to the cover plate (2).

6. The explosion-proof valve structure according to claim 5, wherein said limit seal assembly comprises:

the sealing component (14) is sleeved outside the first fixing component (10), and the bottom and the top of the sealing component are respectively in butt sealing with the top of the limiting component (100) and the inner wall of the cover plate (2);

and the insulating part (15) is sleeved outside the first fixing part (10), and the bottom and the top of the insulating part are respectively in butt joint and seal with the outer wall of the cover plate (2) and the bottom plane of the second fixing part (11).

7. An explosion-proof valve structure according to claim 1, wherein the first fixing member (10) and/or the second fixing member (11) and/or the explosion-proof member (12) are/is made of the same material and are fixed by welding.

8. An explosion-proof valve arrangement according to claim 2, wherein the explosion-proof component (12) is an explosion-proof valve patch.

9. An energy storage unit comprising an explosion proof valve arrangement according to any one of the preceding claims 1-8.

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

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