CN218300126U

CN218300126U - Shell structure with explosion-proof valve and battery

Info

Publication number: CN218300126U
Application number: CN202222404278.8U
Authority: CN
Inventors: 闵昌飞; 赵赫; 肖天丽; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-01-13
Anticipated expiration: 2032-09-09

Abstract

The utility model belongs to the technical field of the battery, a shell structure and battery with explosion-proof valve is disclosed. The shell structure with the explosion-proof valve comprises a shell and the explosion-proof valve, wherein a cover plate assembly is arranged at the top of the shell, and a liquid injection port is formed in the cover plate assembly. The explosion-proof valve sets up the interior bottom at the shell, and the bottom of shell is provided with the pressure release hole, and the explosion-proof valve just sets up to the pressure release hole, and the gas that electric core thermal runaway produced can be followed explosion-proof valve and escaped. The shell structure is reasonable in structure, convenient to assemble and high in battery qualification rate.

Description

Shell structure with explosion-proof valve and battery

Technical Field

The utility model relates to a battery technology field especially relates to shell structure and battery with explosion-proof valve.

Background

At present, the cylindrical battery in the industry is developed with the design goals of low cost and strong sealing. The single cover plate battery technology can be developed rapidly, after the positive cover plate is taken out through the structural design, the winding core, the bus collecting disc and the shell are directly connected, the leakage risk of one-time peripheral welding can be reduced compared with the traditional double-cover plate structure, and the battery has the advantages of low cost, high efficiency and the like. The battery is used as a closed space, and in the using process, the risk of short circuit, liquid leakage and the like is generated at a certain probability, the temperature in the shell is increased and a large amount of gas is generated during short circuit, so that the battery is easy to expand and explode, and therefore, the shell or the cover plate is required to have an explosion-proof function.

Among the prior art, single apron battery's explosion-proof valve all sets up on the apron with annotating the liquid mouth usually, and apron area is narrow and small, will all set up explosion-proof valve and annotate the liquid mouth and will influence the setting of functional area (weld zone, two-dimensional code area and heat shrinkage bush cladding district etc.) on the apron, and then when leading to the battery to annotate liquid, electrolyte flows down easily in explosion-proof valve department, causes explosion-proof valve to receive the corruption inefficacy. In addition, if when the cover plate and the shell are assembled by laser welding, high-temperature sparks are easy to splash to the explosion-proof valve, so that the explosion-proof valve is corroded by pitting and poor in sealing, and further, the battery is leaked or scrapped.

Therefore, it is desirable to provide a housing structure and a battery having an explosion-proof valve to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a shell structure with explosion-proof valve, this shell structure sets up rationally, convenient assembling to the qualification rate of battery is high.

To achieve the purpose, the utility model adopts the following technical proposal:

housing structure with explosion-proof valve, comprising:

the top of the shell is provided with a cover plate component, and the cover plate component is provided with a liquid injection port;

the explosion-proof valve, the explosion-proof valve sets up the interior bottom of shell, the bottom of shell is provided with the pressure release hole, the explosion-proof valve is just right the pressure release hole sets up, and the gas that the electric core thermal runaway produced can be followed explosion-proof valve department escapes.

Optionally, a protection sheet is arranged in the pressure relief hole, and the protection sheet is arranged right opposite to the explosion-proof valve.

Optionally, the pressure relief hole is a stepped hole, a stepped surface is arranged in the stepped hole, and the protection sheet is attached to the stepped surface.

Optionally, the protection sheet is connected with the step surface in an adhesive manner.

Optionally, the diameter of the end, close to the explosion-proof valve, of the stepped hole is smaller than the diameter of the end, far away from the explosion-proof valve, of the stepped hole.

Optionally, the explosion-proof valve comprises a valve plate and an indentation arranged on the valve plate

Optionally, the maximum thickness H of the valve plate is 0.2-0.5 mm.

Optionally, the residual thickness h of the valve plate at the notch is 0.05-0.15 mm.

Optionally, a bottom shell is arranged at the bottom of the shell, the pressure relief hole is formed in the bottom shell, the bottom shell is connected with the explosion-proof valve, and the bottom shell protrudes towards the top of the battery cell to form an explosion space of the explosion-proof valve.

Optionally, the apron subassembly includes the apron main part, be provided with the mounting groove in the apron main part, it sets up to annotate the liquid mouth the tank bottom of mounting groove, annotate the liquid mouth through sealed micelle shutoff, be provided with sealed nail in the mounting groove, sealed nail sets up sealed on the micelle.

Another object of the utility model is to provide a battery, the structure of this battery sets up rationally, convenient assembling to the qualification rate of battery is high.

the battery comprises a winding core and the shell structure with the explosion-proof valve, wherein the winding core is arranged in the shell, and one end of the winding core is connected with the cover plate component.

Has the advantages that:

the utility model provides a shell structure will annotate the liquid mouth and set up on the apron subassembly at battery top, with the explosion-proof valve setting in the bottom of shell. Be different from the structure that liquid injection mouth and explosion-proof valve all set up on the apron subassembly in prior art, the utility model provides a shell structure can provide more spaces for other parts on the apron subassembly, simultaneously, when can not taking place to pour into electrolyte into, the electrolyte flow falls on explosion-proof valve department and leads to sealed relatively poor problem, and in addition, when the apron welds with the shell, can not cause pollution or damage to explosion-proof valve, the production qualification rate of battery is higher, and has good security performance.

Drawings

Fig. 1 is an exploded view of a housing structure with an explosion-proof valve provided by the present invention;

fig. 2 is a schematic structural diagram of a cover plate assembly provided by the present invention;

fig. 3 is a sectional view of an explosion-proof valve provided by the present invention;

FIG. 4 is a cross-sectional view of the housing structure with the explosion-proof valve provided by the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is a first schematic structural diagram of the housing provided by the present invention;

fig. 7 is a schematic structural diagram ii of the housing provided by the present invention;

fig. 8 is a third schematic structural diagram of the housing provided by the present invention.

In the figure:

100. a housing; 200. a cover plate assembly; 210. a cover plate main body; 211. a liquid injection port; 212. mounting grooves; 220. sealing the colloidal particles; 230. sealing the nail; 300. a bottom case; 310. a pressure relief vent; 320. an explosion-proof valve; 321. a valve plate; 322. scoring; 330. a protective sheet; 400. a winding core; 500. and a confluence disc.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 and 2, the present embodiment discloses a housing structure having an explosion-proof valve 320, including a housing 100 and the explosion-proof valve 320. The top of the housing 100 is provided with a cover plate assembly 200, and the cover plate assembly 200 is provided with a liquid injection port 211. The explosion-proof valve 320 is arranged at the inner bottom of the shell 100, the pressure relief hole 310 is formed in the bottom of the shell 100, the explosion-proof valve 320 is arranged opposite to the pressure relief hole 310, and gas generated by thermal runaway of the battery cell can escape from the explosion-proof valve 320.

In the case structure described above, the liquid inlet 211 is provided in the lid assembly 200 on the top of the battery, and the explosion-proof valve 320 is provided in the bottom of the case 100. Be different from the structure that liquid injection port 211 and explosion-proof valve 320 all set up on apron subassembly 200 in the prior art, the shell structure that this embodiment provided can provide more spaces for other parts on the apron subassembly 200, and simultaneously, when can not taking place to pour into electrolyte into, the electrolyte flow falls on explosion-proof valve 320 department and leads to sealed relatively poor problem, in addition, when the apron welds with shell 100, can not cause pollution or damage explosion-proof valve 320, the production qualification rate of battery is higher, and has good security performance.

Further, referring to fig. 2, the cover plate assembly 200 provided in this embodiment includes a cover plate main body 210, a mounting groove 212 is provided on the cover plate main body 210, the liquid injection port 211 is provided at a bottom of the mounting groove 212, the liquid injection port 211 is sealed by a sealing rubber particle 220, a sealing nail 230 is provided in the mounting groove 212, and the sealing nail 230 is provided on the sealing rubber particle 220, so as to have a good sealing effect and prevent liquid leakage.

Further, referring to fig. 3, the explosion-proof valve 320 includes a valve plate 321 and a notch 322 provided on the valve plate 321. When the battery cell is out of control thermally, the battery cell generates a large amount of high-temperature and high-pressure gas, the nick 322 on the valve plate 321 can be broken, and then the gas escapes. In this embodiment, the notch 322 has a closed ring shape, but in other embodiments, it may have an open ring shape. The central part of valve block 321 is protruding upwards to the high temperature high pressure gas that produces when electric core thermal runaway is more easily to protruding position gathering, thereby breaks valve block 321 more easily, realizes releasing pressure rapidly, avoids bigger dangers such as explosion to take place.

Further, the maximum thickness H of the valve sheet 321 is 0.2 to 0.5mm, and may be, for example, 0.2mm,0.3mm,0.4mm or 0.5mm. Understandably, the thickness of the valve plate 321 should be set according to the safety performance requirement of the battery, the thickness of the valve plate 321 is too thin, the strength of the explosion-proof valve 320 is low, the explosion-proof valve is easy to damage, and the thickness of the valve plate 321 is too large, so that the mass is large or the pressure relief effect is difficult to realize.

Further, the residual thickness h of the valve sheet 321 at the notch 322 is 0.05 to 0.15mm, and may be, for example, 0.05mm, 0.1mm, 0.15mm, or the like. In other embodiments, the depth of the notch 322 can be set according to the thickness of the valve sheet 321, and is not limited in detail. Alternatively, the diameter D of the valve plate 321 is 7 to 11mm, and illustratively, may be 7mm,8mm,9mm, 11mm, or the like.

Referring to fig. 4 and 5, further, a protection plate 330 is disposed in the pressure relief hole 310, and the protection plate 330 is disposed opposite to the explosion-proof valve 320. The protection sheet 330 can ensure the sealing performance, prevent the pollution source from contacting the explosion-proof valve 320, influence the durability and the safety performance of the battery, and prevent the damage of the explosion-proof valve 320 caused by the foreign matter directly contacting the explosion-proof valve 320.

Optionally, the pressure relief hole 310 is a stepped hole, a stepped surface is provided in the stepped hole, and the protection plate 330 is attached to the stepped surface. The specific shape and size of the pressure relief hole 310 may be set according to the size of the bottom of the case 100. Alternatively, the connection manner of the protection sheet 330 and the stepped surface may be bonding. Optionally, an installation slot of the explosion-proof valve 320 is provided above the stepped hole, and the explosion-proof valve 320 is embedded above the stepped hole and connected with the housing 100 by laser welding.

Optionally, the diameter of the end of the stepped bore near the explosion-proof valve 320 is smaller than the diameter of the end of the stepped bore away from the explosion-proof valve 320. The diameter of the stepped bore near one end of the explosion proof valve 320 is between the diameter D of the explosion proof valve 320 and the diameter D of the notch 322. The diameter of the protection sheet 330 is 6-10 mm, and the thickness of the protection sheet 330 is 0.15-0.3 mm. The diameter of the stepped bore at the end remote from the explosion-proof valve 320 should be set according to the diameter of the shielding plate 330.

Further, a bottom case 300 is disposed at the bottom of the housing 100, a pressure relief hole 310 is disposed on the bottom case 300, the bottom case 300 is connected to an explosion-proof valve 320, and the bottom case 300 protrudes toward the top of the battery cell to form an explosion space of the explosion-proof valve. Referring to fig. 6, the bottom chassis 300 may have a circular arc type groove structure protruding toward the top. Referring to fig. 7, the bottom chassis 300 may also have a cylindrical recess structure. Of course, a flat bottom type structure as shown in fig. 8 is possible.

The present embodiment also provides a battery including the winding core 400 and the above-described can structure having the explosion-proof valve 320, the winding core 400 being disposed inside the can 100, and one end of the winding core 400 being coupled to the cap plate assembly 200. The shell 100 is also internally provided with a confluence disc 500, and the confluence disc 500 is welded with the winding core 100. This battery will annotate liquid mouth 211 and explosion-proof valve 320 and set up at the different both ends of shell 100, has avoided shell 100 and apron subassembly 200 welding to cause pollution or damage to explosion-proof valve 320, avoids the electrolyte stream to fall and leads to sealed relatively poor problem to take place in explosion-proof valve 320 department, simultaneously, provides more spaces for the setting of other parts on the apron subassembly 200.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Shell structure with explosion-proof valve, its characterized in that includes:

the liquid filling device comprises a shell (100), wherein a cover plate component (200) is arranged at the top of the shell (100), and a liquid filling port (211) is formed in the cover plate component (200);

explosion-proof valve (320), explosion-proof valve (320) set up the interior bottom of shell (100), the bottom of shell (100) is provided with pressure release hole (310), explosion-proof valve (320) just right pressure release hole (310) set up, and the gas that the production of electric core thermal runaway can be followed explosion-proof valve (320) department escapes.

2. The housing structure with an explosion-proof valve according to claim 1, characterized in that a protection sheet (330) is arranged in the pressure relief hole (310), and the protection sheet (330) is arranged opposite to the explosion-proof valve (320).

3. The housing structure with an explosion-proof valve as recited in claim 2, wherein the pressure relief hole (310) is a stepped hole, a stepped surface is provided in the stepped hole, and the protection plate (330) is attached to the stepped surface.

4. The housing structure with explosion-proof valve according to claim 3, wherein the protection sheet (330) is adhesively connected to the stepped surface.

5. The housing structure with explosion-proof valve according to claim 3, characterized in that the diameter of the end of the stepped bore close to the explosion-proof valve (320) is smaller than the diameter of the end of the stepped bore remote from the explosion-proof valve (320).

6. The housing structure with explosion-proof valve according to claim 5, characterized in that the explosion-proof valve (320) comprises a valve plate (321) and a score (322) provided on the valve plate (321).

7. The housing structure with the explosion-proof valve as claimed in claim 6, wherein the maximum thickness H of the valve plate (321) is 0.2-0.5 mm.

8. The housing structure with the explosion-proof valve as claimed in claim 6, wherein the residual thickness h of the valve sheet (321) at the notch (322) is 0.05-0.15 mm.

9. The housing structure with the explosion-proof valve as recited in any one of claims 1 to 8, wherein a bottom shell (300) is disposed at a bottom of the housing (100), the pressure relief hole (310) is disposed on the bottom shell (300), the bottom shell (300) is connected to the explosion-proof valve (320), and the bottom shell (300) protrudes toward a top of the battery cell to form a bursting space of the explosion-proof valve (320).

10. The housing structure with an explosion-proof valve according to any one of claims 1 to 8, characterized in that the cover plate assembly (200) comprises a cover plate main body (210), a mounting groove (212) is provided on the cover plate main body (210), the liquid injection port (211) is provided at the bottom of the mounting groove (212), the liquid injection port (211) is blocked by a sealing rubber particle (220), a sealing nail (230) is provided in the mounting groove (212), and the sealing nail (230) is provided on the sealing rubber particle (220).

11. Battery, characterized in that it comprises a winding core (400) and a can structure with explosion-proof valve according to any one of claims 1-10, the winding core (400) being arranged inside the outer can (100), one end of the winding core (400) being connected to the cover plate assembly (200).