CN217468687U - Explosion-proof valve for battery and battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and provides an explosion-proof valve for a battery, which comprises a shell, wherein the shell is hermetically fixed at an exhaust hole on a substrate of the battery, the substrate is configured to be provided with a positive electrode and a negative electrode, the shell is provided with a gas release hole, and the shell is internally provided with a mounting hole communicated with the gas release hole; the end part of the main body can be abutted against an opening at one end of the mounting hole close to the substrate so as to seal the mounting hole; the elastic piece is arranged in the mounting hole, one end of the elastic piece is pressed against the shell, and the other end of the elastic piece is pressed against the main body; the main body is separated from the mounting hole, and gas in the battery can be discharged through the vent hole, the gap between the main body and the mounting hole and the air leakage hole in sequence. The utility model provides an explosion-proof valve for battery, it can in time get rid of the inside gas of battery, improves the security of battery.

Description

Explosion-proof valve for battery and battery

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to an explosion-proof valve and battery for battery.

Background

The lithium battery is widely applied to the electric automobile, but when the lithium battery is overcharged, short circuit, extrusion and other conditions occur, gas is easily generated inside the lithium battery, if the gas is not timely discharged, explosion, fire and other dangers can be seriously caused, and damage is caused to a user. The current solution is mostly set up the explosion-proof piece on the shell body of battery, and the explosion-proof piece is mostly the aluminum sheet, is carved with the nick on the aluminum sheet, makes the weak point, and when pressure reached the upper limit pressure value that the nick position can bear, the nick position appeared breaking, and the inside gas of battery leaks out, reduces the inside pressure of lithium cell.

However, after the battery is decompressed, the aluminum sheet is broken and cannot be repaired, and the whole battery can only be scrapped and cannot be used any more. In addition, in the process of pressure relief of the battery, if the gas pressure in the battery is too high, electrolyte in the battery is easy to be sprayed out along with the breakage of the aluminum sheet, and the user is injured.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an explosion-proof valve for battery, it can in time get rid of the inside gas of battery, improves the security of battery.

Another object of the utility model is to provide a battery utilizes above-mentioned explosion-proof valve for battery, improves the life of battery.

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

provided is an explosion-proof valve for a battery, including:

a case hermetically fixed at an exhaust hole on a substrate of a battery, the substrate being configured to mount a positive electrode and a negative electrode, the case being provided with a gas release hole, and the inside of the case being provided with a mounting hole communicating with the gas release hole;

the main body is arranged in the mounting hole, and the end part of the main body can be pressed against the opening of one end of the mounting hole close to the substrate so as to seal the mounting hole;

the elastic piece is arranged in the mounting hole, one end of the elastic piece is pressed against the shell, and the other end of the elastic piece is pressed against the main body;

the main part with the mounting hole is throw off, gas in the battery can pass through in proper order the exhaust hole the main part with clearance between the mounting hole with the hole of disappointing leaks out.

Preferably, be provided with the air vent on the lateral wall of main part, the inside gas of battery can pass through in proper order the main part with clearance between the mounting hole the air vent back warp the hole of disappointing leaks out.

Preferably, the mounting hole includes:

the first hole and the second hole that connect gradually, the diameter in first hole is greater than the diameter in second hole, first hole with the hole intercommunication loses heart, the tip of main part can support press in first hole with step between the second hole, in order to seal the main part with clearance between the step.

Preferably, the mounting hole further includes a third hole communicated with the first hole, the first hole has a diameter greater than that of the third hole, the third hole is communicated with the air release hole, and the third hole has a diameter greater than that of the main body by 0.2mm-2 mm.

Preferably, the explosion-proof valve for a battery further includes a sealing member disposed on the main body, the sealing member being configured to seal a gap between the step and the main body.

Preferably, the air relief hole is provided at the top of the housing.

Preferably, the elastic member is a spring.

Preferably, the housing is welded to the base plate.

The utility model discloses in still provide a battery, including the apron subassembly and with apron subassembly welded aluminum hull, the apron subassembly includes explosion-proof valve for the battery, base plate, positive pole, negative pole, plastic part, be provided with on the base plate and annotate the liquid hole, explosion-proof valve for the battery positive pole the negative pole annotate the liquid hole all set up in one side of base plate, the plastic part set up in the opposite side of base plate.

Preferably, the battery is a cylinder or a rectangular parallelepiped.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses in, install the shell exhaust vent department on the base plate of battery, with battery base plate sealing connection, and the main part is located the mounting hole of shell, the elastic component is located between main part and the shell, under the effect of pressing of elastic component, the tip that makes the main part be close to can support to press at the opening part that the mounting hole is close to the one end of base plate, with sealed mounting hole, when the inside gas pressure of battery did not reach certain pressure, elastic component drive main part is sealed with the mounting hole, inside the unable electric core that gets into the battery of outside gas and moisture, electric core still can normally work, can not lead to the battery to leak.

After the inside pressure of battery reaches certain pressure, gaseous can push up the main part, and the elastic component is compressed, and the main part is separated with the shell, and the inside gas of battery gets into the clearance between main part and the mounting hole through the exhaust hole to discharge through disappointing hole, with the inside pressure of reduction battery, thereby guarantee that the battery continues normal use. The battery explosion-proof valve in the embodiment can enable gas in the battery to be slowly released, and the pressure cannot be accumulated to exceed a critical point to cause explosion. After the gas in the battery is discharged, the pressure is gradually reduced, and the main body is in contact sealing with the mounting hole of the shell again under the action of the elastic piece, so that the battery can be continuously used, and the problems that the battery structure is damaged and the battery is scrapped after the gas is exhausted from the battery in the prior art are solved.

In addition, the explosion-proof valve can discharge gas harmful to the battery cell generated in the charging and discharging process, and the service life of the battery can be properly prolonged.

Drawings

Fig. 1 is a schematic structural view of an explosion-proof valve for a battery according to the present invention;

fig. 2 is a schematic structural diagram of the housing of the present invention;

fig. 3 is a schematic structural diagram of the battery cell of the battery of the present invention;

wherein, 1, a shell; 2. a main body; 3. an elastic member; 4. mounting holes; 41. a first hole; 42. a second hole; 43. a third aperture; 44. a step; 5. an air release hole; 6. a seal member; 7. a vent hole; 8. a substrate; 9. a positive electrode; 10. a negative electrode; 11. a plastic part; 12. a liquid injection hole, 100 and an explosion-proof valve for the battery.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating 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.

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.

In order to solve the problem that the conventional battery, such as a sheet battery (e.g., a rectangular parallelepiped battery) or a cylindrical battery, is easy to generate gas in the battery during use, and the explosion of the battery due to the excessive gas in the battery is prevented, so that the gas in the battery needs to be discharged, and the battery can be continuously and normally used. In order to solve the above problems, as shown in fig. 1 and 2, the present embodiment provides an explosion-proof valve for a battery, which includes a case 1, a body 2, and an elastic member 3, wherein the case 1 is hermetically fixed to an exhaust hole on a substrate 8 of the battery, the substrate 8 is configured to mount a positive electrode 9 and a negative electrode 10, a gas release hole 5 is provided on the case 1, and an interior of the case 1 is provided with a mounting hole 4 communicating with the gas release hole 5. The main body 2 is arranged in the mounting hole 4, and the end part of the main body 2 can abut against the opening of the mounting hole 4 close to one end of the substrate 8 so as to seal the mounting hole 4. The elastic element 3 is arranged in the mounting hole 4, one end of the elastic element 3 is pressed against the shell 1, and the other end is pressed against the main body 2. The main body 2 is separated from the mounting hole 4, and gas in the battery can be discharged through the vent hole, the gap between the main body 2 and the mounting hole 4 and the air release hole 5 in sequence.

In the above embodiment, install shell 1 in the exhaust hole department on the base plate 8 of battery, with battery base plate 8 sealing connection, and main part 2 is located the mounting hole 4 of shell 1, elastic component 3 is located between main part 2 and the shell 1, under the effect of supporting of elastic component 3, make the tip of main part 2 can support and press the opening part that is close to the one end of base plate 8 in mounting hole 4, with the clearance between sealed main part 2 and the mounting hole 4, when the inside gas pressure of battery did not reach certain pressure, elastic component 3 drive main part 2 is sealed with mounting hole 4, inside outside gas and moisture can't get into the electric core of battery, electric core still can normally work, can not lead to the battery to leak.

After the pressure inside the battery reaches certain pressure, the gas can push the main body 2 open, the elastic piece 3 is compressed, the main body 2 is separated from the shell 1, the gas inside the battery enters the gap between the main body 2 and the mounting hole 4 through the exhaust hole and is discharged through the air leakage hole 5, so that the pressure inside the battery is reduced, and the battery is ensured to be continuously and normally used. The explosion-proof valve for the battery in this embodiment is because of setting up elastic component 3 and acting on main part 2, and the in-process of disappointing makes the inside gas of battery slowly let out, and pressure can not pile up and cause the explosion beyond the critical point, and the inside electrolyte of battery can not spout and cause the injury to the user simultaneously. After the gas in the battery is discharged, the pressure is gradually reduced, and under the action of the elastic piece 3, the main body 2 is in contact sealing with the mounting hole 4 of the shell 1 again, so that the battery can be continuously used, and the problems that the battery structure is damaged and the battery is scrapped after the gas is exhausted from the battery in the prior art are solved.

In addition, the explosion-proof valve can discharge gas harmful to the battery cell generated in the charging and discharging process, and the service life of the battery can be properly prolonged.

Preferably, the case 1 is welded on the substrate 8 to prevent the explosion-proof valve for the battery from falling off the substrate 8 and causing battery leakage during the use of the battery, and in addition, the gas inside the battery and the elastic member 3 generate acting force on the case 1, so that the case 1 is welded on the substrate 8 to increase the structural strength and ensure the safe operation of the explosion-proof valve.

With respect to the specific structure of the mounting hole 4, as shown in fig. 2, the mounting hole 4 includes a first hole 41 and a second hole 42 connected in sequence, the diameter of the first hole 41 is larger than that of the second hole 42, the first hole 41 is communicated with the air release hole 5, and the end of the main body 2 can abut against a step 44 between the first hole 41 and the second hole 42. In this embodiment, the step 44 between the second hole 42 and the first hole 41 is in contact with the end of the main body 2 to seal the gap between the step 44 and the main body 2, thereby ensuring the separation between the outside and the inside of the battery and preventing the external gas and water from entering the inside of the battery. The diameter of the first hole 41 is larger than that of the second hole 42, and when the gas inside the battery needs to be discharged, the gas is discharged out of the battery through the gas discharge hole, the gap between the main body 2 and the step 44, the space between the first hole 41 and the main body 2, and the gas discharge hole 5 in this order. The space between the first hole 41 and the main body 2 is large, and gas in the battery enters into both spaces as a buffer, so that the gas in the battery is guaranteed to be discharged quickly, and the pressure in the battery is reduced quickly.

It is further preferable that the mounting hole 4 further includes a third hole 43 communicating with the first hole 41, the diameter of the first hole 41 is larger than the diameter of the third hole 43, the third hole 43 communicates with the air release hole 5, and the diameter of the first hole 41 is larger than the diameter of the main body 2 by 0.2mm to 2 mm.

In this embodiment, the third hole 43 and the second hole 42 are respectively located at two ends of the first hole 41, the end of the main body 2 is pressed against the step 44 between the first hole 41 and the second hole 42, and the main body 2 and the step 44 are sealed. In addition, the diameter of the third hole 43 is 0.2-2mm larger than that of the main body 2, and the main body 2 reciprocates along the axial direction of the third hole 43 under the action of gas pressure inside the battery and the elastic force of the elastic member 3, and the main body 2 is guided by the reciprocating motion of the third hole 43, so that the main body 2 is ensured not to be inclined in the reciprocating motion process.

Preferably, the elastic member 3 is a cylindrical coil spring, and may also be a conical spring. The elastic force of the spring is determined according to the pressure value of the gas in the battery, namely, the explosion-proof force of the gas in the battery is controlled by the elastic force of the spring. Further preferably, the elastic member 3 is made of high carbon steel.

Preferably, a vent hole 7 is formed in the side wall of the main body 2, and gas inside the battery can sequentially pass through a gap between the main body 2 and the step 44 and the vent hole 7 and then be discharged through the air release hole 5.

Set up air vent 7 on the lateral wall on main part 2, when the inside gas pressure of battery reaches certain pressure, gas is in proper order through exhaust hole, the clearance between main part 2 and the step 44, the clearance between the lateral wall of first hole 41 and main part 2, air vent 7 after, gas is let out through disappointing hole 5. The provision of the vent 7 enables the gas in the battery to be rapidly discharged. The diameter of the vent hole 7 ranges from 0.5mm to 1.5mm, preferably, the diameter of the vent hole 7 is 0.5mm, and in addition, the shape of the vent hole 7 is one or more of square, diamond or triangle.

Preferably, the air release hole 5 is opened at the top of the casing 1 to ensure rapid and smooth discharge of the gas. Specifically, the air release hole 5 is located at the top of the mounting hole 4 to ensure that the path of the air release is shortest and the air release is rapid.

Preferably, the explosion-proof valve for a battery further includes a sealing member 6, the sealing member 6 being provided on the main body 2 to seal a gap between the step 44 and the main body 2. Set up sealing member 6 in order to guarantee to seal between step 44 and the main part 2 to when guaranteeing that battery internal pressure does not reach certain pressure, the battery is inside to cut off with the outside, and battery inside seal prevents that outside gas and moisture from entering the battery inside, influences the battery and normally works. In addition, set up sealing member 6 and seal between the two, simple structure, with low costs, easily realize, during the pressure release, sealing member 6 breaks away from with the step 44 of shell 1, forms the clearance to gas lets out. Preferably, the sealing member 6 is a rubber sealing ring, and the rubber sealing ring is an O-ring. The diameter range of the sealing ring is 1mm-3 mm. Preferably the diameter of the sealing ring is 1 mm.

As shown in fig. 3, the embodiment further provides a battery, which includes a cover plate assembly and an aluminum case welded to the cover plate assembly, the cover plate assembly includes the above explosion-proof valve 100 for battery, a substrate 8, a positive electrode 9, a negative electrode 10, and a plastic part 11, the substrate 8 is provided with a liquid injection hole 12, the explosion-proof valve 100 for battery, the positive electrode 9, the negative electrode 10, and the liquid injection hole 12 are all disposed on one side of the substrate 8, and the plastic part 11 is disposed on the other side of the substrate 8. Above-mentioned apron subassembly and aluminium casing welding back form the electric core of battery, and the battery in this embodiment can continue to use after taking place the flatulence inside, through above-mentioned explosion-proof valve for the battery exhaust, can not make the battery scrap, and simultaneously, the battery can not cause the explosion because of inside gas, increases its security performance, and in addition, above-mentioned battery can also utilize explosion-proof valve to get rid of the harmful gas to electric core that produces in the charge-discharge process, can suitably prolong the life of battery.

Preferably, the battery is a cylinder or a rectangular parallelepiped. When the battery is a cylindrical battery, the explosion-proof valve for the battery is welded with the cylindrical shell of the cylindrical battery.

Preferably, the substrate 8 and the housing 1 are made of aluminum alloy, so that the substrate and the housing are made of the same material, and are welded conveniently. Further preferably, the substrate 8 and the housing 1 are made of aluminum-manganese alloy, so as to ensure the structural strength and the service performance of the battery.

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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and 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 (10)

1. An explosion-proof valve for a battery, comprising:

a case (1) hermetically fixed to an exhaust hole on a substrate (8) of a battery, the substrate (8) being configured to mount a positive electrode (9) and a negative electrode (10), the case (1) being provided with a gas release hole (5), and the inside of the case (1) being provided with a mounting hole (4) communicating with the gas release hole (5);

the main body (2) is arranged in the mounting hole (4), and the end part of the main body (2) can be pressed against the opening of the mounting hole (4) close to one end of the substrate (8) so as to seal the mounting hole (4);

the elastic piece (3) is arranged in the mounting hole (4), one end of the elastic piece (3) is pressed against the shell (1), and the other end of the elastic piece is pressed against the main body (2);

main part (2) with mounting hole (4) throw off, gas in the battery can pass through in proper order the exhaust hole main part (2) with clearance between mounting hole (4) with hole (5) of disappointing let out.

2. The explosion-proof valve for battery as defined in claim 1, wherein the main body (2) is provided with a vent hole (7) on its side wall, and the gas inside the battery can sequentially pass through the gap between the main body (2) and the mounting hole (4) and the vent hole (7) and then escape through the air escape hole (5).

3. The explosion-proof valve for a battery as claimed in claim 1 or 2, wherein the mounting hole (4) comprises:

first hole (41) and second hole (42) that connect gradually, the diameter of first hole (41) is greater than the diameter of second hole (42), first hole (41) with disappointing hole (5) intercommunication, the tip of main part (2) can be supported and pressed in first hole (41) with step (44) between the second hole (42) to seal main part (2) with clearance between step (44).

4. The explosion-proof valve for battery as defined in claim 3, wherein the mounting hole (4) further comprises a third hole (43) communicating with the first hole (41), the diameter of the first hole (41) is larger than the diameter of the third hole (43), the third hole (43) communicates with the air-escape hole (5), and the diameter of the third hole (43) is larger than the diameter of the main body (2) by 0.2mm-2 mm.

5. The explosion vent valve for a battery as recited in claim 3, further comprising a sealing member (6), wherein the sealing member (6) is disposed on the main body (2), and wherein the sealing member (6) is configured to seal a gap between the step (44) and the main body (2).

6. The explosion-proof valve for battery as defined in claim 1 or 2 wherein the air escape hole (5) is provided at the top of the housing (1).

7. The explosion-proof valve for a battery as claimed in claim 1 or 2, wherein the elastic member (3) is a spring.

8. The explosion-proof valve for a battery as claimed in claim 1 or 2, wherein the housing (1) is welded to the base plate (8).

9. A battery, comprising a cover plate assembly and an aluminum case welded to the cover plate assembly, wherein the cover plate assembly comprises the explosion-proof valve (100) for battery of any one of claims 1 to 8, a base plate (8), a positive electrode (9), a negative electrode (10) and a plastic part (11), a liquid injection hole (12) is arranged on the base plate (8), the explosion-proof valve for battery, the positive electrode (9), the negative electrode (10) and the liquid injection hole (12) are all arranged on one side of the base plate (8), and the plastic part (11) is arranged on the other side of the base plate (8).

10. The battery of claim 9, wherein the battery is cylindrical or rectangular parallelepiped.

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