CN210576157U

CN210576157U - Explosion-proof structure of cylindrical battery

Info

Publication number: CN210576157U
Application number: CN201921162813.5U
Authority: CN
Inventors: 何献文; 李少华; 潘文硕
Original assignee: HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
Current assignee: HUIZHOU HUIDERUI LITHIUM BATTERY TECHNOLOGY CO LTD
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-05-19
Anticipated expiration: 2029-07-23

Abstract

The utility model relates to a battery structure and manufacturing technical field especially relate to an explosion-proof construction of cylindrical battery. The anti-explosion battery comprises a convex anti-explosion cap and a battery core shell, wherein the convex anti-explosion cap comprises an upper cover and a lower cover, and the edge of the upper cover is buckled with the inward ring edge of the upper end of the battery core shell; the lower cover comprises a stainless iron sheet and a bottom cover connected with the positive electrode leading-out end, the edge of the upper end of the bottom cover is buckled with the edge of the stainless iron sheet towards the inner ring edge, the upper cover consists of an upper boss of a concentric shaft, a middle ring step edge and a lower ring step edge, and exhaust holes are uniformly distributed on the middle ring step edge; an explosion-proof membrane is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, and the explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer, an aluminum layer, a Polyethylene (PE) layer and a hot melt adhesive layer. It can prevent the occurrence of malignant accidents such as explosion, fire and the like.

Description

Explosion-proof structure of cylindrical battery

Technical Field

The utility model relates to a battery structure and manufacturing technical field especially relate to an explosion-proof construction of cylindrical battery.

Background

With the development of scientific technology, electronic products are used more and more frequently in daily life, and the cylindrical lithium battery is widely applied to providing electric energy sources for various electronic products. The cylindrical lithium battery has the advantages of high voltage platform, high stored energy density, light weight, long service life, environmental protection and the like, but has the problem of poor safety which cannot be ignored. When the cylindrical lithium battery is used for charging under overvoltage and overcurrent or for a long time, explosion or spontaneous combustion can occur due to short circuit, so that potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

To the technical defect, the utility model provides a novel explosion-proof construction of safe, reliable cylindrical battery.

In order to solve the technical problem, the utility model provides a technical scheme is: a novel explosion-proof structure of a cylindrical battery comprises a convex explosion-proof cap and a battery core shell, wherein the convex explosion-proof cap comprises an upper cover and a lower cover, and the edge of the upper cover is buckled with the inward ring edge of the upper end of the battery core shell; the lower cover comprises a stainless iron sheet and a bottom cover connected with the positive electrode leading-out end, the edge of the upper end of the bottom cover is buckled with the edge of the stainless iron sheet towards the inner ring edge, the upper cover consists of an upper boss of a concentric shaft, a middle ring step edge and a lower ring step edge, and exhaust holes are uniformly distributed on the middle ring step edge; an explosion-proof membrane is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, and the explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer, an aluminum layer, a Polyethylene (PE) layer and a hot melt adhesive layer. When the battery cell has the problems of overcurrent, voltage or long service life, overheating and the like, the internal pressure of the closed space rises sharply, the explosion-proof membrane taking the aluminum base as the bottom breaks down rapidly, hot air in the battery cell body is discharged in time, and serious accidents such as explosion, fire and the like are prevented.

Further: in the novel explosion-proof structure of the cylindrical battery, the number of the vent holes on the middle ring step edge is 4, so that the length of a gas leakage channel is shortened, and the rapid pressure relief is facilitated. This also makes it possible to suitably increase the pressure resistance of the rupture disk. And hot-pressed gas in the core body is rapidly discharged, so that the internal pressure of the core body is reduced, and the explosion of the battery core is prevented. And an insulating sealing ring is arranged at the buckling position of the battery core shell and the upper cover. The upper end of the edge of the stainless iron sheet is provided with a PTC sensitive element with a positive temperature coefficient. The thickness of the aluminum layer is 0.05 +/-0.02 mm, and the thickness of the polyethylene PE layer is 0.05 +/-0.02 mm. The thickness of the polyethylene terephthalate PET layer is 0.03 +/-0.02 mm, and the thickness of the thermosol layer is 0.08 +/-0.02 mm. The thickness of each base layer is too thin, so that the withstand voltage value is too low, and the normal use of the battery is influenced. Because the battery is required to be used for a long time in a temperature range of-40 ℃ to +85 ℃, even used for a short time above 85 ℃, particularly in a high-temperature environment, electrolyte in the battery can volatilize, so that certain air pressure exists in the battery, the explosion-proof membrane is required to be stable for a long time under the air pressure value, the air pressure value is good, the conventional force is generally 5-15 kilograms, and the optimal force is 40 kilograms. The thickness of each base layer is too thick, so that the detonation value of the explosion-proof membrane is too large, and the detonation is generally carried out in a short time under the condition of 40-60 kilograms of force. This requires rapid pressure relief after the internal pressure of the battery is reached; multiple vents may help to allow for rapid pressure relief.

Compared with the prior art, the explosion-proof structure of the cylindrical battery comprises a convex explosion-proof cap and a battery core shell, wherein the convex explosion-proof cap comprises an upper cover and a lower cover, and the edge of the upper cover is buckled with the inward ring edge of the upper end of the battery core shell; the lower cover comprises a stainless iron sheet and a bottom cover connected with the positive electrode leading-out end, the upper end edge of the bottom cover is buckled with the edge of the stainless iron sheet towards the inner ring edge, an explosion-proof membrane is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, the upper cover consists of an upper boss of a concentric shaft, a middle ring step edge and a lower ring step edge, and exhaust holes are uniformly distributed on the middle ring step edge; an explosion-proof membrane is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, and the explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer, an aluminum layer, a Polyethylene (PE) layer and a hot melt adhesive layer. When the battery cell has the problems of overcurrent, voltage or long service life, overheating and the like, the internal pressure of the closed space rises sharply, the explosion-proof membrane taking the aluminum base as the bottom breaks down rapidly, hot air in the battery cell body is discharged in time, and serious accidents such as explosion, fire and the like are prevented.

Drawings

Fig. 1 is a schematic view of an explosion-proof structure of a cylindrical battery of the present invention;

FIG. 2 is an enlarged structural view of the buckling position of the shell and the explosion-proof cap of the present invention;

FIG. 3 is an enlarged sectional structural view of the rupture disk;

wherein: 1 battery core shell, 2 upper cover, 21 upper boss, 22 middle ring step edge, 23 lower ring step, 24 vent hole, 3 stainless iron sheet, 4 bottom cover, 5 explosion-proof membrane, 6 insulating seal ring, 7PTC sensitive element, 8 positive pole leading-out terminal, 51PET layer, 52 aluminum layer, 53PE layer, 54 hot melt adhesive layer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1-3, the novel explosion-proof structure of a cylindrical battery comprises a convex explosion-proof cap and a battery core shell 1, wherein the convex explosion-proof cap comprises an upper cover 2 and a lower cover, and the edge of the upper cover is buckled with the inward ring edge at the upper end of the battery core shell; the lower cover comprises a stainless iron sheet (3) and a bottom cover 4 connected with the positive leading-out end, the edge of the upper end of the bottom cover is buckled with the edge of the stainless iron sheet towards the inner ring edge, the upper cover 2 consists of an upper boss 21, a middle ring step edge 22 and a lower ring step edge 23 which are concentric, and exhaust holes 24 are uniformly distributed on the middle ring step edge; an explosion-proof membrane 5 is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, and the explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer 51, an aluminum layer 52, a Polyethylene (PE) layer 53 and a hot melt adhesive layer 54. The number of the exhaust holes 24 is 4. And an insulating sealing ring 6 is arranged at the buckling position of the battery core shell and the upper cover. And a PTC sensitive element 7 with a positive temperature coefficient is arranged at the upper end of the edge of the stainless iron sheet. The thickness of the aluminum layer is 0.05 +/-0.02 mm, and the thickness of the polyethylene PE layer is 0.05 +/-0.02 mm. The thickness of the polyethylene terephthalate PET layer is 0.03 +/-0.02 mm, and the thickness of the thermosol layer is 0.08 +/-0.02 mm. When the battery cell has the problems of overcurrent, voltage or long service life, overheating and the like, the internal pressure of the closed space rises sharply, the explosion-proof membrane taking the aluminum base as the bottom breaks down rapidly, hot air in the battery cell body is discharged from the exhaust hole 24 in time, and the occurrence of serious accidents such as explosion, fire and the like is prevented.

The above is only the preferred embodiment of the present invention, and any obvious combination and replacement should fall within the protection scope of the present invention without departing from the present invention.

Claims

1. An explosion-proof structure of a cylindrical battery comprises a convex explosion-proof cap and a battery core shell (1), wherein the convex explosion-proof cap comprises an upper cover (2) and a lower cover, and the edge of the upper cover is buckled with the inward ring edge of the upper end of the battery core shell; the lower cover includes stainless iron piece (3) and draws forth bottom (4) that the end is connected with the positive pole, bottom upper end border is at the stainless iron piece border of inside ring limit lock, its characterized in that:

the upper cover (2) consists of an upper boss (21) of a concentric shaft, a middle ring step edge (22) and a lower ring step edge (23), and exhaust holes (24) are uniformly distributed on the middle ring step edge;

an explosion-proof membrane (5) is arranged between the bottom cover and the stainless iron sheet, the battery cell is enclosed in a closed space by the explosion-proof membrane and the shell, and the explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer (51), an aluminum layer (52), a Polyethylene (PE) layer (53) and a hot melt adhesive layer (54).

2. The explosion-proof structure of a cylindrical battery according to claim 1, wherein: the number of the exhaust holes (24) is 4.

3. The explosion-proof structure of a cylindrical battery according to claim 1, wherein: and an insulating sealing ring (6) is arranged at the buckling position of the battery core shell and the upper cover.

4. The explosion-proof structure of a cylindrical battery according to claim 3, wherein: the upper end of the edge of the stainless iron sheet is provided with a PTC sensitive element (7) with a positive temperature coefficient.

5. The explosion-proof structure of a cylindrical battery according to claim 1, wherein: the thickness of the aluminum layer is 0.05 +/-0.02 mm, and the thickness of the polyethylene PE layer is 0.05 +/-0.02 mm.

6. The explosion-proof structure of a cylindrical battery according to claim 1, wherein: the thickness of the polyethylene terephthalate PET layer is 0.03 +/-0.02 mm, and the thickness of the hot melt adhesive layer is 0.08 +/-0.02 mm.