CN220934320U - Explosion-proof valve with tension spring structure - Google Patents

Abstract

The utility model provides an explosion-proof valve with a tension spring structure, which is arranged on a battery pack and used for balancing the internal and external pressure of the battery pack, and comprises the following components: the valve comprises a main body, a valve core, a fixing cap, a tension spring and a top cover arranged on the valve core. The main body is internally provided with a containing cavity, an explosion-proof cavity and a pressure relief hole which are communicated with each other, and the valve core is positioned in the main body and used for separating the containing cavity from the explosion-proof cavity; the fixed cap is arranged in the main body, two ends of the tension spring are respectively connected with the fixed cap and the valve core, and the tension spring provides tension force for pulling the valve core to be clung to the inner wall of the accommodating cavity; the valve core is internally provided with a waterproof and breathable film, and the valve core is provided with through holes and air holes. When the air pressure is normal, the air is exhausted through the waterproof air-permeable membrane, and when the pressure is high, the valve core is jacked up to exhaust, so that the pressure can be quickly released when the pressure in the battery pack is abnormal, and safety accidents are avoided; the valve core is pulled by the tension spring to separate the explosion-proof cavity from the accommodating cavity, the valve core can reset automatically after pressure relief, the elasticity of the tension spring is controllable, and the pressure relief performance is safe and reliable.

Description

Explosion-proof valve with tension spring structure

Technical Field

The utility model relates to the technical field of battery explosion prevention, in particular to an explosion-proof valve with a tension spring structure.

Background

The battery pack of the new energy automobile can generate heat in the charging and discharging processes, so that the internal pressure of the battery pack is increased, and an explosion-proof valve is required to be arranged at the battery pack to balance the internal pressure and the external pressure of the battery pack in order to maintain the stability of a battery system.

However, in order to save time, the vehicle owner selects the quick-charging pile to quickly charge the new energy automobile, the temperature of the battery pack rises faster during quick-charging, meanwhile, the pressure in the battery pack also rises rapidly, the pressure rising speed is greater than the pressure release speed of the existing explosion-proof valve, the battery pack operates in a high-temperature and high-pressure environment, and the internal battery and circuit elements of the battery pack are easy to break down and even cause safety accidents.

Therefore, how to improve the pressure release capability of the explosion-proof valve in emergency situations is a problem to be solved.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, and provides an explosion-proof valve with a tension spring structure, so that the pressure release capacity of the explosion-proof valve is improved.

The aim of the utility model is realized by the following technical scheme:

an explosion-proof valve with extension spring structure locates on the battery package for balanced battery package internal and external pressure includes: the valve comprises a main body, a valve core, a fixed cap, a tension spring and a top cover arranged on the valve core;

The main body is internally provided with a containing cavity, an explosion-proof cavity and a pressure relief hole which are communicated, and the valve core is positioned in the main body and used for separating the containing cavity from the explosion-proof cavity;

The fixing cap is arranged in the main body, two ends of the tension spring are respectively connected with the fixing cap and the valve core, and the tension spring provides tension force for pulling the valve core to be clung to the inner wall of the accommodating cavity;

the waterproof breathable film is arranged in the valve core, and the valve core is provided with through holes and air holes.

In one embodiment, a sealing ring is arranged at the contact position of the valve core and the accommodating cavity.

In one embodiment, a flange is arranged on the outer wall of the valve core, and the flange is used for pressing the sealing ring.

In one embodiment, a pressing ring is arranged in the valve core, and the pressing ring presses the edge of the waterproof breathable film.

In one embodiment, a rubber pad is arranged between the waterproof breathable film and the inner cavity of the valve core.

In one embodiment, a groove communicated with the air hole is formed in the outer wall of the valve core.

In one embodiment, an iron sheet is arranged in the valve core, the upper end of the valve core is provided with an opening, the iron sheet is used for sealing the valve core, the air holes are positioned on the iron sheet, and a plurality of air holes and grooves are formed in the air holes.

In one embodiment, the iron sheet is provided with an anti-offset protrusion, and the anti-offset protrusion is located in one of the grooves.

In one embodiment, a guiding tube is arranged at the center of the main body, the tension spring is accommodated in the guiding tube, the fixing cap and the valve core are located on two sides of the guiding tube, a positioning groove and a semi-open type butt joint part are arranged on the guiding tube, the semi-open type butt joint part extends from the end part of the guiding tube to the side surface of the guiding tube, and the fixing cap is arranged on the semi-open type butt joint part.

In one embodiment, the fixing cap comprises a base body, a first clamping ring and a second clamping ring, a limiting groove matched with the first clamping ring is formed in the semi-open type butt joint part, the second clamping ring is embedded in the positioning groove, a hanging hole is formed in the base body, and a hook matched with the hanging hole is arranged on the tension spring.

Compared with the prior art, the explosion-proof valve with the tension spring structure has the following advantages:

1. When the air pressure is normal, the air is exhausted through the waterproof air-permeable membrane, and when the pressure is high, the valve core is jacked up to exhaust, so that the pressure can be quickly released when the pressure in the battery pack is abnormal, and safety accidents are avoided;

2. The valve core is pulled by the tension spring to separate the explosion-proof cavity from the accommodating cavity, the valve core can reset automatically after pressure relief, the elasticity of the tension spring is controllable, and the pressure relief performance is safe and reliable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a split schematic view of an explosion valve with a tension spring structure;

FIG. 2 is a schematic view of the internal structure of an explosion-proof valve having a tension spring structure;

FIG. 3 is a partial cross-sectional view of a valve cartridge;

Fig. 4 is a schematic structural view of a main body of the explosion-proof valve having a tension spring structure;

FIG. 5 is a schematic cross-sectional view of a body of an explosion valve having a tension spring structure;

FIG. 6 is a schematic diagram of the venting of an explosion proof valve with a tension spring structure during normal operation of the battery pack;

FIG. 7 is a schematic diagram of venting of an explosion-proof valve having a tension spring structure in a thermal runaway condition in a battery pack;

FIG. 8 is a schematic view of a state of detecting tightness of a battery pack using a jig;

FIG. 9 is a schematic illustration of the mating of a semi-open docking portion with a retaining cap;

fig. 10 is a schematic structural view of the fixing cap.

Reference numerals:

Explosion-proof valve 10 with tension spring structure, main body 100, accommodating cavity 110, explosion-proof cavity 120, pressure relief hole 130, guide tube 140, positioning groove 141, semi-open butt joint part 142, limit groove 143, valve core 200, waterproof and breathable membrane 210, compression ring 220, iron sheet 230, air hole 231, anti-offset protrusion 232, through hole 240, flange 250, rubber pad 260, groove 270, fixing cap 300, base 310, hanging ring 311, first clamping ring 320, second clamping ring 330, tension spring 400, hook 410, top cover 500, sealing ring 600, jig 20, strong magnet 21

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present utility model provides an explosion-proof valve 10 with a tension spring structure, which is disposed on a battery pack and used for balancing the internal and external pressures of the battery pack, and comprises: the valve comprises a main body 100, a valve core 200, a fixing cap 300, a tension spring 400 and a top cover 500 arranged on the valve core 200.

Referring to fig. 4 and 5, a main body 100 is provided with a containing cavity 110, an explosion-proof cavity 120 and a pressure relief hole 130 which are communicated, and a valve core 200 is located in the main body 100 and used for separating the containing cavity 110 and the explosion-proof cavity 120; when the explosion-proof valve 10 with the tension spring structure is fixed, a mounting hole is reserved on the outer wall of the box body of the battery pack, the main body 100 is arranged on the mounting hole, and when the pressure in the battery pack rises, gas flows from the pressure relief hole 130 to the explosion-proof cavity 120. Preferably, the pressure relief holes 130 are provided with a plurality of pressure relief holes 130 (as shown in fig. 4), and the plurality of pressure relief holes 130 are distributed in a circumferential array with the guide pipe 140 as a center, so as to increase the pressure relief efficiency of the explosion-proof valve.

Referring to fig. 2, the fixing cap 300 is disposed in the main body 100, two ends of the tension spring 400 are respectively connected with the fixing cap 300 and the valve core 200, and the tension spring 400 provides a tensile force for pulling the valve core 200 to be tightly attached to the inner wall of the accommodating cavity 110; the valve core 200 is fixed at the junction of the accommodating cavity 110 and the explosion proof cavity 120 by the tensile force provided by the tension spring 400, so that the two cavities are separated. Thus, when the pressure of the gas entering the explosion-proof chamber 120 is smaller than the tension force provided by the tension spring 400, the gas enters the valve core 200, and when the pressure of the gas entering the explosion-proof chamber 120 is larger than the tension force provided by the tension spring 400 due to thermal runaway of the battery pack or other reasons, the valve core 200 is jacked, and the gas in the battery pack is directly discharged outwards through the accommodating chamber 110.

Referring to fig. 2 and 3, a waterproof and breathable film 210 is disposed in the valve core 200, the valve core 200 is provided with a through hole 240, the through hole 240 is communicated with the explosion-proof cavity 120, gas entering the explosion-proof cavity 120 can enter the valve core 200 through the through hole 240, an air hole 231 is formed in the valve core 200, and the gas penetrating through the waterproof and breathable film 210 is discharged outwards from the air hole 231.

The differences between the normal ventilation of the explosion-proof valve 10 with the tension spring structure and the pressure relief under the thermal runaway condition of the battery pack are as follows:

Referring to fig. 2 and 6, when the battery pack is operating normally, the valve cartridge 200 separates the accommodating chamber 110 from the explosion-proof chamber 120, and gas can only be discharged from the valve cartridge 200. Specifically, the gas flows into the explosion-proof cavity 120 through the pressure relief hole 130, then enters the valve core 200 from the through hole 240, passes through the waterproof and breathable film 210 and then is discharged from the air hole 231, so that the balance of the internal and external air pressure of the battery pack is maintained, and the stable operation of the battery is ensured. The exhaust gas needs to pass through the waterproof and breathable film 210, and meanwhile, the waterproof and breathable film 210 and the top cover 500 on the valve core 200 also form a protective layer, so that external dust, particles and rainwater are prevented from penetrating into the battery pack.

Referring to fig. 2 and 7, when the thermal runaway or failure occurs in the battery pack, the pressure in the battery pack is rapidly increased, and the high-pressure gas passes through the valve core 200 and is directly discharged from the accommodating chamber 110. Specifically, the high-pressure gas flows into the explosion-proof cavity 120 through the pressure relief hole 130, the air displacement of the waterproof and air-permeable membrane 210 is limited, when the air pressure exceeds the tensile force provided by the tension spring 400, the valve core 200 is jacked up, at this time, the explosion-proof cavity 120 is communicated with the accommodating cavity 110, the gas can be directly discharged outwards from the accommodating cavity 110 without passing through the waterproof and air-permeable membrane 210, the purpose of rapid pressure relief is achieved, and after the air pressure in the battery pack is reduced, the valve core 200 is pressed on the inner wall of the accommodating cavity 110 again under the tensile force provided by the tension spring 400, and the explosion-proof cavity 120 is separated from the accommodating cavity 110 again.

Compared with the prior art, the explosion-proof valve 10 with the tension spring structure has the following advantages:

1. The valve core 200 is movable by arranging the tension spring 400, the air is exhausted through the waterproof air-permeable membrane 210 when the air pressure is normal, the valve core 200 is jacked up to exhaust when the pressure is high, the pressure can be quickly released when the pressure in the battery pack is abnormal, and safety accidents are avoided;

2. The valve core 200 is pulled by the tension spring 400 to separate the explosion-proof cavity 120 from the accommodating cavity 110, the pressure relief can be automatically reset after pressure relief, the elasticity of the tension spring 400 is controllable, and the pressure relief performance is safe and reliable.

It should be noted that, in order to ensure air tightness, referring to fig. 2, a sealing ring 600 is disposed at a position where the valve core 200 contacts the accommodating cavity 110, and a flange 250 is disposed on an outer wall of the valve core 200, where the flange 250 is used for pressing the sealing ring 600. When the tension spring 400 provides tension to enable the valve core 200 to be tightly attached to the accommodating cavity 110, the flange 250 on the outer wall of the valve core 200 compresses the sealing ring 600, so that the air tightness of the explosion-proof valve can be ensured when the battery pack normally operates, and the air in the battery pack is discharged only through the waterproof breathable film 210. Of course, in order to ensure the tightness of the battery pack, a sealing ring 600 is also provided at a position where the body 100 contacts the battery pack.

In one embodiment, referring to fig. 1 and 3, a pressing ring 220 is disposed in the valve core 200, the pressing ring 220 presses the edge of the waterproof and breathable membrane 210, and the pressing ring 220 contacts with and applies pressure to the edge of the waterproof and breathable membrane 210. A rubber pad 260 is arranged between the waterproof and breathable membrane 210 and the inner cavity of the valve core 200. The rubber pad 260 is in a ring shape and is used for being adhered to the edge of the waterproof and breathable membrane 210, and the rubber pad 260 is matched with the compression ring 220 to fix the waterproof and breathable membrane 210 in the valve core 200.

Further, referring to fig. 3 and 6, a groove 270 communicating with the air hole 231 is formed on the outer wall of the valve core 200, and a flow channel is formed between the groove 270 and the inner wall of the top cover 500, so that the air exhausted from the valve core 200 is exhausted outwards through the position where the groove 270 is located.

Wherein, the iron sheet 230 is arranged in the valve core 200, the upper end of the valve core 200 is opened, the iron sheet 230 is positioned at the opening for blocking the valve core 200, the air holes 231 are positioned on the iron sheet 230, and a plurality of air holes 231 and grooves 270 are arranged, so that the exhaust position of the valve core 200 is increased, and the exhaust efficiency is improved.

Preferably, referring to fig. 3, the iron plate 230 is provided with an anti-offset protrusion 232, and the anti-offset protrusion 232 is located in one of the grooves 270. After the anti-offset protrusions 232 are embedded into the grooves 270, the iron sheet 230 cannot rotate relative to the valve core 200, so that the alignment of the air holes 231 and the grooves 270 can be ensured, and the smooth exhaust of the valve core 200 can be maintained.

In an embodiment, referring to fig. 2 and 5, a guiding tube 140 is disposed at a central position of the main body 100, a tension spring 400 is accommodated in the guiding tube 140, a fixing cap 300 and a valve core 200 are disposed at two sides of the guiding tube 140, and a positioning groove 141 and a semi-open butt joint portion 142 are disposed on the guiding tube 140. The extension spring 400 is arranged in the guide tube 140, so that high-temperature and high-pressure gas in the battery pack can be prevented from directly contacting with the extension spring 400, the service life of the extension spring 400 is prolonged, and the extension spring 400 is protected by the guide tube 140, so that the abrasion of the extension spring 400 when the valve core 200 moves or the explosion-proof valve is assembled can be avoided.

Referring to fig. 9 and 10, the semi-open type butt joint portion 142 extends from the end of the guide tube 140 to the side surface thereof, the fixing cap 300 covers the semi-open type butt joint portion 142, the fixing cap 300 includes a base 310, a first clamping ring 320 and a second clamping ring 330, the semi-open type butt joint portion 142 is provided with a limit groove 143 matching with the first clamping ring 320, the second clamping ring 330 is embedded in the limit groove 141, the base 310 is provided with a hanging hole 311, and the tension spring 400 is provided with a hook 410 matching with the hanging hole.

When in assembly, one end of the tension spring 400 is connected with the valve core 200, the valve core 200 is installed in the main body 100, at the moment, the other end of the tension spring 400 is exposed at the semi-open butt joint part 142, the tension spring 400 is picked up from the semi-open butt joint part and is applied with tension, and the other end of the tension spring 400 is pulled out from the guide tube 140;

The base body 310 is hooked by penetrating the hook 410 into the hanging hole 311, so that the tension spring 400 is connected with the fixing cap 300; then, the fixing cap 300 is moved to cover the semi-open butt joint part 142, the first clamping ring 320 is inserted into the limiting groove 143, finally, the fixing cap 300 is released, the tension spring 400 is contracted, the second clamping ring 330 is embedded into the positioning groove 141, and at the moment, the elastic force provided by the tension spring 400 keeps the fixing cap 300 tightly attached to the semi-open butt joint part 142.

As can be seen, the guide tube 140 and the fixing cap 300 are detachably connected, and the semi-open butt portion 142 extends from the end of the guide tube 140 to the side thereof, so as to facilitate picking up the hook 410; the connecting force between the fixing cap 300 and the guide tube 140 is provided by the tension spring 400, when the fixing cap is assembled, the hanging hook 410 only needs to penetrate into the hanging hole 311 and align the first clamping ring 320 with the limiting groove 143, after the external force is removed, the tension spring 400 automatically fixes the fixing cap 300 on the guide tube 140, the assembling process is simple and convenient, and the damage to the tension spring 400 is not easy to cause.

It should be noted that, referring to fig. 8, the iron sheet 230 for plugging the valve core 200 may be attracted by a magnet, after the explosion-proof valve is installed on the outer wall of the battery pack case, the jig 20 provided with the strong magnet 21 may be sleeved on the explosion-proof valve 10 having the tension spring structure, so that the strong magnet 21 and the top cover 500 are attached together, the iron sheet 230 is attracted by the strong magnet 21, and then a pulling force is applied to pull the valve core 200 up, so that the explosion-proof cavity 120 is communicated with the accommodating cavity 110, and gas is filled into the battery pack at this time for detecting whether the air tightness of the battery pack reaches the standard. The iron sheet 230 seals the valve core 200, protects the waterproof and breathable film 210, and serves as a trigger component to facilitate air tightness detection of the battery pack.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. An explosion-proof valve with extension spring structure locates on the battery package for balanced battery package internal and external pressure, its characterized in that includes: the valve comprises a main body, a valve core, a fixed cap, a tension spring and a top cover arranged on the valve core;

The main body is internally provided with a containing cavity, an explosion-proof cavity and a pressure relief hole which are communicated, and the valve core is positioned in the main body and used for separating the containing cavity from the explosion-proof cavity;

The fixing cap is arranged in the main body, two ends of the tension spring are respectively connected with the fixing cap and the valve core, and the tension spring provides tension force for pulling the valve core to be clung to the inner wall of the accommodating cavity;

the waterproof breathable film is arranged in the valve core, and the valve core is provided with through holes and air holes.

2. The explosion-proof valve with the tension spring structure as set forth in claim 1, wherein a sealing ring is provided at a position where the valve core contacts the accommodating chamber.

3. The explosion-proof valve with the tension spring structure according to claim 2, wherein a flange is arranged on the outer wall of the valve core, and the flange is used for pressing the sealing ring.

4. The explosion-proof valve with the tension spring structure according to claim 1, wherein a compression ring is arranged in the valve core, and the compression ring presses the edge of the waterproof breathable film.

5. The explosion-proof valve with the tension spring structure according to claim 1, wherein a rubber pad is arranged between the waterproof breathable film and the inner cavity of the valve core.

6. The explosion-proof valve with the tension spring structure as set forth in claim 1, wherein a groove communicated with the air hole is formed on the outer wall of the valve core.

7. The explosion-proof valve with the tension spring structure according to claim 6, wherein an iron sheet is arranged in the valve core, the upper end of the valve core is opened, the iron sheet is used for sealing the valve core, the air hole is positioned on the iron sheet, and a plurality of air holes and a plurality of grooves are respectively arranged.

8. The explosion-proof valve with tension spring structure as recited in claim 7, wherein said iron sheet is provided with an anti-deflection protrusion, said anti-deflection protrusion being located in one of said grooves.

9. The explosion-proof valve with the tension spring structure according to claim 1, wherein a guide pipe is arranged at the center of the main body, the tension spring is accommodated in the guide pipe, the fixing cap and the valve core are positioned on two sides of the guide pipe, a positioning groove and a semi-open type butt joint part are arranged on the guide pipe, the semi-open type butt joint part extends to the side face of the guide pipe from the end part of the guide pipe, and the fixing cap is arranged on the semi-open type butt joint part.

10. The explosion-proof valve with the tension spring structure according to claim 9, wherein the fixing cap comprises a base body, a first clamping ring and a second clamping ring, a limiting groove matched with the first clamping ring is formed in the semi-open type butt joint part, the second clamping ring is embedded in the positioning groove, a hanging hole is formed in the base body, and a hook matched with the hanging hole is arranged on the tension spring.