CN214227082U

CN214227082U - Lithium battery with safety valve plate

Info

Publication number: CN214227082U
Application number: CN202120435557.3U
Authority: CN
Inventors: 杨红艳; 王正伟; 程凯; 陈梦婷
Original assignee: Xingheng Power Supply Chuzhou Co ltd
Current assignee: Xingheng Power Supply Chuzhou Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-09-17
Anticipated expiration: 2031-02-26

Abstract

The utility model discloses a lithium battery containing safety valve block, which comprises a battery body, wherein the battery body comprises a liquid injection hole, a safety valve block and a cover body, the safety valve block is arranged on the liquid injection hole, the liquid injection hole comprises a sinking part and a through hole, the through hole is communicated with the battery body, the safety valve block comprises an edge part and a convex part, the edge part and the convex part form a cavity, the edge part is matched with the sinking part, the convex part is matched with the through hole, the cover body comprises a cover edge and a containing part, the cover edge and the containing part form a containing cavity, the cover body is arranged on the upper side of the safety valve block and isolates the safety valve block from the outside, the peripheral dimension of the cover edge is larger than that of the edge part, the cover body isolates the safety valve block from the outside air and water vapor, and reduces the corrosion speed of the safety valve block, the service life of lithium cell has been prolonged, and the practicality is strong, plays the pressure release cushioning effect simultaneously, and the security is strong.

Description

Lithium battery with safety valve plate

Technical Field

The utility model relates to a lithium cell technical field, concretely relates to lithium cell that contains safety valve piece.

Background

Lithium batteries (lithium batteries) refer to batteries containing lithium (including metallic lithium, lithium alloys and lithium ions, lithium polymers) in an electrochemical system. In the prior art, after the liquid injection of the battery body of the lithium battery is completed, the safety valve made of a metal material is usually adopted for sealing so as to prevent the electrolyte in the battery body from contacting with the outside air, which is difficult to avoid, and some electrolyte can be remained around the safety valve; during the processing of the lithium battery, if the temperature difference between a production workshop and the outside of the workshop is large, water vapor can be formed on the surface of the lithium battery, and the corrosion to the safety valve is accelerated; when the safety valve is corroded and perforated, electrolyte can easily flow out to cause pollution, damage to a device using the lithium battery or damage to human skin; when the internal formation of the battery is insufficient, gas is left in the battery body, when the external temperature changes too much, the battery body is easy to expand in volume, if the external temperature changes too much, the battery body can explode, and even a fire disaster can be caused.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above disadvantages, the present invention provides a lithium battery with a safety valve plate, which can isolate the outside air, slow down the corrosion rate of the electrolyte to the safety valve plate, and achieve a good sealing effect; even the safety valve piece is corroded and is perforated, also can prevent that electrolyte from directly exposing in the air, reduces the damage to outside diaphragm, device and the operating personnel who contacts the lithium cell, simultaneously, plays certain cushioning effect that holds, security height to the gas of letting out from this internal battery.

In order to achieve the above purpose, the utility model discloses a technical scheme is: the utility model provides a lithium cell that contains safety valve piece, includes the battery body, the battery body still includes safety valve piece and lid including annotating the liquid hole, the safety valve piece sets up annotate on the liquid hole, annotate the liquid hole including portion and the through-hole that sinks, the terminal surface height of the portion that sinks is less than the height of annotating battery body one side that the liquid hole set up, through-hole and battery body intercommunication, the safety valve piece includes edge part and bulge, edge part and bulge formation cavity, the edge part with the cooperation of the portion that sinks, the bulge with the through-hole cooperation, the lid is including covering along and the portion of holding, the lid is along forming with the portion of holding and holds the chamber, the lid sets up safety valve piece upside will safety valve piece is isolated with the outside, the peripheral dimensions who covers the edge is greater than the peripheral dimensions of edge part.

Preferably, the cover body is made of polypropylene.

Preferably, the cover body is arranged on the upper side of the safety valve plate in an adhesive mode.

Preferably, the cover rim is integrally provided with the receiving portion.

Preferably, the cover is provided in a circular shape along the outer circumference thereof.

Preferably, the height of the side of the accommodating part far away from the cover edge is higher than the height of the side of the cover edge close to the accommodating part.

Preferably, the safety valve plate is arranged on the liquid injection hole in a welding mode.

Preferably, the edge portion and the projection are integrally provided.

Preferably, the peripheral shape of the edge portion is provided in a circular shape.

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

the liquid injection hole is sealed by arranging the safety valve plate and the cover body, so that the sealing effect is better;

the cover body is arranged on the safety valve sheet, and the peripheral size of the cover edge is larger than that of the edge part, so that the safety valve sheet can be isolated from external air and water vapor, the reaction of electrolyte with the air and the water vapor is reduced, the corrosion speed of the electrolyte on the safety valve sheet is reduced, and the service life of the safety valve sheet is prolonged;

by arranging the cover body on the safety valve plate, even if the safety valve plate is corroded and perforated, the electrolyte cannot be directly exposed in the air, so that loss is prevented, meanwhile, operators are prevented from contacting the electrolyte, and the safety is high;

through set up the lid on the safety valve piece, even the safety valve piece is corroded the perforation, this internal gaseous effluvium that has of battery, can preferentially get into the chamber that holds of lid, play the pressure release cushioning effect, the security is strong.

Drawings

Fig. 1 is a schematic view of an overall structure of a lithium battery according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of a lithium battery body according to a preferred embodiment of the present invention;

FIG. 3 is a cross-sectional view of the injection hole according to a preferred embodiment of the present invention;

fig. 4 is a top view of a safety valve according to a preferred embodiment of the present invention;

fig. 5 is a schematic structural view of a cover according to a preferred embodiment of the present invention;

fig. 6 is a sectional view of the safety valve and the cover body according to a preferred embodiment of the present invention.

In the figure:

10. a battery body; 11. a liquid injection hole; 111. a sinking portion; 112. a through hole; 20. a safety valve plate; 21. an edge portion; 22. a projection; 23. a cavity; 30. a cover body; 31. a cover rim; 32. an accommodating portion; 33. a receiving cavity.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

As shown in fig. 1 to 6, the lithium battery including the safety valve sheet in this embodiment includes a battery body 10, a safety valve sheet 20 and a cover body 30, as shown in fig. 2, the battery body 10 includes a liquid injection hole 11, as shown in fig. 3, the liquid injection hole 11 includes a sinking portion 111 and a through hole 112, an end surface height of the sinking portion 111 is lower than a height of one side of the battery body 10 set by the liquid injection hole 11, the through hole 112 is communicated with an inside of the battery body 10, as shown in fig. 4 and 6, the safety valve sheet 20 is set on the liquid injection hole 11, the through hole 112 is sealed, the safety valve sheet 20 includes an edge portion 21 and a protruding portion 22, the protruding portion 22 and the edge portion 21 form a cavity 23, the edge portion 21 is matched with the sinking portion 111, and the protruding portion 22 is matched with the through hole 112, so that the safety valve sheet 20 can be clamped on the liquid injection hole 11.

Preferably, the safety valve sheet 20 is disposed on the liquid injection hole 11 by welding.

Preferably, the edge portion 21 and the projecting portion 22 are integrally provided.

Preferably, the peripheral shape of the edge portion 21 is provided in a circular shape.

As shown in fig. 5 and fig. 6, the lid 30 includes that the lid is along 31 and holding part 32, holding part 32 keeps away from the lid and is higher than the lid along 31 height that is close to holding part 32 one side along 31 one side, the lid is along 31 and holding part 32 formation and holds chamber 33, the lid is along 31 and the cooperation of edge portion 21 of safety valve piece 20, lid 30 sets up at safety valve piece 20 upside, with safety valve piece 20 and outside isolated, the lid is greater than the peripheral dimension of edge portion 21 along 31 peripheral dimension, so set up, can be with safety valve piece 20 and outside air, the steam is isolated, sealed effect is better, in order to slow down the speed that safety valve piece 20 was corroded by electrolyte, and simultaneously, prevent that the inside electrolyte of battery body 10 from directly exposing in the air behind the corruption safety valve piece 20, harm the human body or install the device of lithium cell.

Preferably, the cover 30 is made of polypropylene.

Preferably, the cover 30 is arranged on the upper side of the safety valve plate 20 by gluing, so as to seal the safety valve plate 20.

Preferably, the cover rim 31 and the receiving portion 32 are integrally provided.

Preferably, the cover edge 31 of the cover 30 is provided with a circular shape.

The working principle of the utility model is as follows:

after lithium ion injection is carried out on the battery body 10 through the injection hole 11, the battery body 10 is sealed through the safety valve sheet 20 and the cover body 30, the injection hole 11 is sealed through the safety valve sheet 20, the cover edge 31 of the cover body 30 is larger than the edge part 21 of the safety valve sheet 20 in peripheral size, sealing of the safety valve sheet 20 is achieved, the cover body 30 can enable the safety valve sheet 20 to be isolated from outside air, the sealing effect is better, the corrosion speed of the safety valve sheet 20 by electrolyte is reduced, and the service life is prolonged;

during lithium battery processing, because the temperature difference between the interior and the exterior of a workshop is large, water vapor can be formed on the surface of the battery body 10 and the outer side of the safety valve 20, and because the cover body 30 exists, the external water vapor is isolated, so that the corrosion to the safety valve 20 is avoided, and the service life is prolonged;

even if the safety valve plate 20 is corroded and perforated, when the electrolyte leaks out of the safety valve plate 20 from the battery body 10, the cover body 30 can prevent the electrolyte from being directly exposed in the air to damage devices using the lithium battery or damage the skin of a human body, and due to the transparent polypropylene material of the cover body 30, an operator can easily observe the leakage of the electrolyte, so that the lithium battery can be replaced, and a reminding effect is achieved;

when safety valve piece 20 is corroded and is perforated, when the inside gas of battery body 10 leaks, lid 30 can hold the gas that leaks in holding chamber 33, plays the pressure release cushioning effect, and operating personnel observes battery body 10's state according to the inflation degree of lid 30 very easily, and then changes the lithium cell, has good practicality.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a lithium cell that contains safety valve piece, includes the battery body, the battery body is including annotating the liquid hole, its characterized in that: still include safety valve block and lid, the safety valve block sets up on annotating the liquid hole, annotate the liquid hole including portion and the through-hole that sinks, the terminal surface height that sinks the portion is less than the height of annotating battery body one side that the liquid hole set up, through-hole and the inside intercommunication of battery body, the safety valve block includes edge part and bulge, edge part and bulge formation cavity, the edge part with the cooperation of the portion that sinks, the bulge with the through-hole cooperation, the lid is including covering along and holding the portion, the lid is formed with holding the chamber along with holding the portion, the lid sets up safety valve block upside will safety valve block and outside are isolated, the peripheral dimensions who covers along is greater than the peripheral dimensions of edge part.

2. The lithium battery with the safety valve sheet of claim 1, wherein: the cover body is made of polypropylene.

3. The lithium battery with the safety valve sheet according to claim 1 or 2, wherein: the cover body is arranged on the upper side of the safety valve plate in an adhesive mode.

4. A lithium battery with a safety valve according to claim 3, wherein: the cover rim and the accommodating portion are integrally provided.

5. A lithium battery with a safety valve according to claim 3, wherein: the outer peripheral shape of the lid edge is set to be circular.

6. A lithium battery with a safety valve according to claim 3, wherein: the height of one side of the containing part far away from the cover edge is higher than that of one side of the cover edge close to the containing part.

7. The lithium battery with the safety valve sheet of claim 1, wherein: the safety valve plate is arranged on the liquid injection hole in a welding mode.

8. The lithium battery with the safety valve sheet as claimed in claim 1 or 6, wherein: the edge portion and the projecting portion are integrally provided.

9. The lithium battery with the safety valve sheet of claim 8, wherein: the peripheral shape of the edge portion is set to be circular.