Breathing anti-explosion valve

Abstract

A valve element assembly comprises a blocking piece, a spring and a waterproof breathable film, the blocking piece is arranged on an air inlet of a battery pack, an air hole is formed in the middle of the blocking piece, and the waterproof breathable film covers the air hole, so that when the internal and external pressure difference of the battery pack is small, the air inlet of the battery pack can breathe through the air hole, and the pressure difference is balanced; meanwhile, the separation blade has magnetism, the spring is arranged on the separation blade and matched with the valve cover assembly, and when the air tightness test is carried out on the battery pack, the magnet is adopted to adsorb the separation blade outside the valve cover assembly, so that the separation blade can move towards the valve cover assembly under the action of magnetic force and drive the spring to be synchronously compressed; the inside of the battery pack can be inflated and deflated through cooperation of the exhaust port and the air inlet of the battery pack conveniently and quickly, after the air tightness test is completed, the magnet is taken away, the spring can drive the separation blade to reset under the action of the restoring force of the spring, and it is guaranteed that the breathing anti-explosion valve can work normally and is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to an explosion-proof valve of a battery pack. Background Art

[0002] Existing battery pack explosion-proof valves usually come in two forms: metal spring explosion-proof valves and plastic needle-puncture explosion-proof valves. Both prevent battery explosion by controlling the pressure and temperature inside the battery pack. When excessive pressure is generated inside the battery pack, the explosion-proof valve will automatically open under the action of the pressure difference, releasing the high-pressure gas into the external environment, thereby reducing the internal pressure of the battery pack and effectively preventing the risk of battery explosion.

[0003] However, existing explosion-proof valves cannot isolate external water vapor, which can easily cause condensation to form inside the battery pack, leading to insulation failure and accelerated corrosion. At the same time, when the battery pack is offline and airtightness testing is performed, the battery pack needs to be filled and discharged through the explosion-proof valve. However, existing explosion-proof valves require additional pressure or other holes to be opened on the battery pack. The battery pack can only be filled and discharged after the explosion-proof valve is opened. The operation is cumbersome and can easily cause the explosion-proof valve to fail. It also increases the risk of battery pack airtightness and affects the overall performance and reliability of the explosion-proof valve.

[0004] Therefore, how to improve the overall performance and reliability of explosion-proof valves and enable explosion-proof valves to be tested for air tightness quickly and conveniently has become an urgent problem to be solved in this field. Utility Model Content

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a breathing explosion-proof valve that is stable and reliable and can perform air tightness testing efficiently and conveniently.

[0006] In order to achieve the above-mentioned purpose, the breathing explosion-proof valve provided by the utility model includes a valve cover assembly, a base and a valve core assembly arranged between the valve cover assembly and the base.

[0007] The valve cover assembly is formed with an exhaust hole, the bottom of the base is formed with a battery pack air inlet, and the valve cover assembly and the base are connected to form a ventilation channel.

[0008] The valve core assembly includes a baffle, a spring and a waterproof breathable membrane. The baffle is connected to the base, placed on the air inlet of the battery pack, and is configured to be magnetic. A breathable hole is formed in the middle. The waterproof breathable membrane covers the breathable hole. The spring is arranged on the baffle and cooperates with the valve cover assembly.

[0009] Furthermore, the valve cover assembly includes an upper cover and a protective cover, the upper cover is provided with upper cover air holes, and the protective cover is disposed on the upper cover and configured to cover part of the upper cover air holes to form the exhaust holes and the air-permeable cavity.

[0010] Furthermore, the base is configured with a T-shaped cross-section, the upper area forms a connecting plate for cooperating with the upper cover, the middle area of ​​the connecting plate is formed with a placement groove that can accommodate the valve core assembly therein, and the placement groove extends toward the bottom of the base to form the battery pack air inlet.

[0011] Furthermore, the upper cover and the connecting plate are configured to be detachably connected.

[0012] Furthermore, a plurality of base air holes connected with the exhaust hole and the air-permeable cavity are evenly distributed on the periphery of the placement groove.

[0013] Furthermore, a first sealing ring is provided on the outer side of the blocking piece.

[0014] Furthermore, a second sealing ring is provided on the outside of the base.

[0015] Furthermore, an anti-corrosion layer is provided on the surface of the baffle.

[0016] The breathing explosion-proof valve provided by the utility model has a valve core assembly including a baffle, a spring and a waterproof breathable membrane. The baffle is connected to the base and is placed on the air inlet of the battery pack, and an air hole is formed in the middle. The waterproof breathable membrane covers the air hole, so that when the pressure difference between the inside and outside of the battery pack is small, the air inlet of the battery pack can breathe through the air hole to balance the pressure difference, and the waterproof breathable membrane blocks the entry of water vapor to ensure that the inside of the battery pack is dry.

[0017] At the same time, the baffle is magnetic, and the spring is set on the baffle to cooperate with the valve cover assembly. When the battery pack is tested for air tightness, a magnet is used to adsorb the baffle on the outside of the valve cover assembly, so that the baffle can move toward the valve cover assembly under the action of the magnetic force, and drive the spring to compress synchronously to open the air inlet of the battery pack and open the breathing explosion-proof valve. The exhaust port and the battery pack air inlet can be used to charge and discharge the air inside the battery pack, which is convenient and fast. When the air tightness test is completed, the magnet is removed, and the spring can drive the baffle to reset under the action of its own restoring force, thereby ensuring that the breathing explosion-proof valve can work normally, stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the breathing explosion-proof valve provided by the utility model;

[0020] Figure 2 An exploded diagram of the breathing explosion-proof valve provided by the utility model;

[0021] Figure 3 This is a schematic structural diagram of the upper cover in the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the protective cover in the present utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the valve cover assembly in this utility model

[0024] Figure 6 This is a schematic structural diagram of the base in the present utility model;

[0025] Figure 7 This is a structural diagram of the valve core assembly in the present utility model;

[0026] Figure 8 This is a schematic diagram of the working path of the breathing explosion-proof valve in the utility model;

[0027] Reference numerals:

[0028] 100. Valve cover assembly; 110. Upper cover; 111. Upper cover air hole; 112. Connecting groove; 113. Elastic buckle; 120. Protective cover; 121. Sealing plate; 122. Connecting teeth;

[0029] 200. Base; 210. Connecting plate; 211. Mounting groove; 212. Connecting flange; 220. Battery pack air inlet; 230. Second sealing ring;

[0030] 300. Valve core assembly; 310. Baffle; 311. Vent hole; 312. First sealing ring; 320. Spring; 330. Waterproof breathable membrane;

[0031] 400. Ventilation channel; 410. Exhaust hole; 420. Breathable cavity; 430. Base air hole. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0033] See also Figure 1 and Figure 2 , which shows an example of the breathing explosion-proof valve provided by the utility model.

[0034] As can be seen from the figure, the breathing explosion-proof valve provided in this example includes a valve cover assembly 100 , a base 200 and a valve core assembly 300 arranged between the valve cover assembly 100 and the base 200 .

[0035] An exhaust hole 410 is formed on the valve cover assembly 100, and a battery pack air inlet 220 is formed at the bottom of the base 200. The valve cover assembly 100 is connected to the base 200 to form a ventilation channel 400, so that the valve core assembly 300 can open the battery pack air inlet 220 under the action of pressure difference to release the high-pressure gas inside the battery pack.

[0036] Furthermore, the valve core assembly 300 includes a baffle 310, a spring 320 and a waterproof breathable membrane 330. The baffle 310 is connected to the base 200, placed on the battery pack air inlet 220, and is configured to be magnetic. A breathable hole 311 is formed in the middle. The waterproof breathable membrane 330 covers the breathable hole 311. The spring 320 is arranged on the baffle 310 and cooperates with the valve cover assembly 100, so that when the pressure difference between the inside and outside of the battery pack is small, the battery pack air inlet 220 can balance the internal and external pressure difference through the breathable hole 311 and the waterproof breathable membrane 330, and prevent water vapor from entering the battery pack air inlet 220, thereby ensuring the dryness of the battery pack. At the same time, the baffle 310 and the spring 320 can cooperate to achieve a quick and convenient air tightness test, thereby improving the stability and reliability of the breathing explosion-proof valve.

[0037] Among them, combined Figure 1 and Figure 2 The valve cover assembly 100 includes an upper cover 110 and a protective cover 120. The upper cover 110 is distributed with upper cover air holes 111. The protective cover 120 is set on the upper cover 110 and is configured to cooperate with the upper cover air holes 111 to cover part of the upper cover air holes 111 to form exhaust holes 410 and a breathable cavity 420, so that gas can flow in the exhaust holes 410 and the breathable cavity 420.

[0038] Specifically, combined Figure 3 The upper cover 110 is preferably configured with a circular cross-section, and a number of upper cover air holes 111 are formed symmetrically along the center of the circle. In this example, the upper cover air holes 111 are configured with a trapezoidal cross-section with a width gradually increasing from the center of the circle to the outer circumference, so as to increase the area of ​​the upper cover air holes 111 and facilitate the circulation of gas.

[0039] Furthermore, among the several upper cover air holes 111, several symmetrically distributed upper cover air holes 111 have connecting grooves 112 formed on the inner sides, so that the protective cover 120 can be set on the upper cover 110 through the connecting grooves 112, and cooperate with the upper cover air holes 111 to form exhaust holes 410 and a breathable cavity 420.

[0040] In conjunction with, combined with Figure 4 The protective cover 120 is configured to have a circular cross-section with a diameter smaller than that of the upper cover 110, and extends outward along the outer circumference to form a number of evenly distributed sealing plates 121, among which several symmetrically distributed sealing plates 121 also extend outward to form connecting teeth 122, so that the protective cover 120 can be placed on the upper cover 110, and the connecting teeth 122 are snap-connected with the connecting grooves 112 on the inner side of the air holes 111 of the upper cover, thereby setting the protective cover 120 on the upper cover 110.

[0041] Combine Figure 1 and Figure 5Since the diameter of the protective cover 120 is smaller than that of the upper cover 110, the sealing plate 121 on the protective cover 120 can only cover part of the upper cover air holes 111, so that the uncovered upper cover air holes 111 form exhaust holes 410, and several exhaust holes 410 are evenly distributed on the outer circumference of the upper cover 110. Accordingly, the covered upper cover air holes 111 form a breathable cavity 420 located between the upper cover 110 and the protective cover 120, so that gas can flow in the exhaust holes 410 and the breathable cavity 420, forming a gas channel in the valve cover assembly 100.

[0042] Furthermore, the protective cover 120 is arranged on the upper cover 110, and covering part of the upper cover air holes 111 can also effectively prevent sparks from leaking out when the battery pack is thermally runaway, thereby protecting the safety of the external environment.

[0043] Combine Figure 2 and Figure 6 In order to enable the base 200 to be connected and cooperated with the valve cover assembly 100 to form the ventilation channel 400, the base 200 is configured with a T-shaped cross-section, and a connecting plate 210 is formed in the upper area for cooperating with the upper cover 110. A placement groove 211 is formed in the middle area of ​​the connecting plate 210 to accommodate the valve core assembly 300, and the placement groove 211 extends toward the bottom of the base 200 to form a battery pack air inlet 220, so that gas can flow between the placement groove 211 and the battery pack air inlet 220, forming a gas channel in the base 200.

[0044] Furthermore, the connecting plate 210 is configured to have a circular cross-section that is compatible with the upper cover 110, and is configured to be detachably connected to the upper cover 110. For example, a connecting flange 212 is provided on the outer circumference of the connecting plate 210, and an elastic clip 113 is provided on the outer circumference of the upper cover 110, so that the upper cover 110 can clamp the connecting flange 212 of the connecting plate 210 through the elastic clip 113, thereby connecting the valve cover assembly 100 and the base 200.

[0045] At the same time, combined Figure 2 and Figure 6 A number of base air holes 430 are evenly distributed around the seating groove 211 of the connecting plate 210. The base air holes 430 on the connecting plate 210 correspond to the upper cover air holes 111 on the upper cover 110, so that when the connecting plate 210 is connected to the upper cover 110, the base air holes 430 can be connected with the upper cover air holes 111, thereby making the base air holes 430 connected with the exhaust holes 410 and the air permeable cavity 420, and gas can flow between the exhaust holes 410, the air permeable cavity 420 and the base air holes 430.

[0046] The valve cover assembly 100 thus constructed is interconnected and cooperated with the base 200, so that the exhaust hole 410, the breathable cavity 420, and the base air hole 430 are interconnected to form a ventilation channel 400, so that the gas inside the battery pack can be discharged from the exhaust hole 410 to the outside through the battery pack air inlet 220. At the same time, the gas outside the battery pack can flow from the battery pack air inlet 220 to the inside through the exhaust hole 410, so as to realize the circulation of gas inside and outside the battery pack.

[0047] Combine Figure 1 、 Figure 2 and Figure 7 In order to ensure that the breathing explosion-proof valve can balance the pressure difference when the pressure difference between the inside and outside of the battery pack is small, and quickly release the high-pressure gas inside the battery pack when the pressure difference between the inside and outside of the battery pack is large, the valve core assembly 300 is accommodated in the placement groove 211 in the middle area of ​​the connecting plate 210. The valve core assembly 300 includes a baffle 310, a spring 320 and a waterproof breathable membrane 330, so that the valve core assembly 300 can cooperate with the battery pack air inlet 220 to achieve pressure difference balance in the battery pack and release of high-pressure gas.

[0048] Specifically, the baffle 310 is placed in the seating groove 211, abuts against the seating groove 211, and is placed on the battery pack air inlet 220. A vent hole 311 is also provided in the middle so that gas can flow between the battery pack air inlet 220, the vent hole 311 and the ventilation channel 400. Furthermore, a first sealing ring 312 is provided on the outside of the baffle 310 to seal the battery pack air inlet 220 and prevent gas leakage at the fitting point between the baffle 310 and the seating groove 211.

[0049] Furthermore, a waterproof breathable membrane 330 is provided on the baffle 310, covering the vent 311. The waterproof breathable membrane 330 is preferably made of PET or EPTFE membrane, so that gas can flow in the vent 311 through the waterproof breathable membrane 330, while also isolating external water vapor from entering the vent 311, thereby preventing water vapor from entering the battery pack air inlet 220 from the ventilation channel 400, thereby ensuring the dryness of the inside of the battery pack.

[0050] Therefore, combined Figure 8 The waterproof breathable membrane 330 and the air holes 311 cooperate so that when the pressure difference between the inside and outside of the battery pack is small, external gas can enter the air cavity 420 from the exhaust hole 410 of the ventilation channel 400, and then enter the base air hole 430 from the air cavity 420, and finally enter the battery pack air inlet 220 through the air hole 311, thereby realizing the breathing of the battery pack air inlet 220 to balance the pressure difference between the inside and outside, and at the same time preventing the entry of water vapor, thereby improving the service life of the battery pack.

[0051] Further, combined with Figure 1 、 Figure 2 and Figure 7The spring 320 is provided on the baffle 310, with one end connected to the baffle 310 and the other end connected to the upper cover 110, so that when the pressure difference between the inside and outside of the battery pack is large, the high-pressure gas in the battery pack can act on the baffle 310, generating pressure on the baffle 310, driving the baffle 310 to move toward the upper cover 110, and at the same time compressing the spring 320 so that the baffle 310 no longer abuts against the seating groove 211, opening the battery pack air inlet 220, so that the high-pressure gas in the battery pack can flow from the battery pack air inlet 220 through the base air hole 430 of the ventilation channel 400, and finally be discharged from the exhaust hole 410, thereby preventing the battery pack from exploding. Figure 8 shown.

[0052] After the high-pressure gas is discharged, the pressure inside and outside the battery pack is balanced. The spring 320 drives the baffle 310 to move back toward the upper cover 110 under the action of its own elastic force, so that the baffle 310 is reset and abuts against the seating groove 211 again, closing the battery pack air inlet 220, so that the breathing explosion-proof valve can continue to work normally.

[0053] The valve core assembly 300 thus formed can cooperate with the ventilation channel 400 formed by the valve cover assembly 100 and the base 200 to realize the breathing of the battery pack air inlet 220, balance the pressure difference in the battery pack and the release of high-pressure gas, and prevent the entry of water vapor, thereby improving the stability and reliability of the breathing explosion-proof valve.

[0054] In order to enable the breathing explosion-proof valve to be quickly and conveniently tested for air tightness without affecting the overall performance of the breathing explosion-proof valve, the baffle 310 of the valve core assembly 300 is configured to be magnetic, for example, made of an iron sheet, so that during the air tightness test, a magnet is used to magnetically adsorb the baffle 310 outside the valve cover assembly 100, generating a magnetic force on the baffle 310, driving the baffle 310 to move toward the valve cover assembly 100, and at the same time compressing the spring 320 so that the baffle 310 no longer abuts the seating groove 211, opening the battery pack air inlet 220, and the battery pack air inlet 220 can be charged and discharged through the exhaust hole 410 to complete the air tightness test of the battery pack.

[0055] Furthermore, after the air tightness test is completed, the magnet is removed, and the spring 320 drives the baffle 310 to move back toward the valve cover assembly 10 under the action of its own elastic force, so that the baffle 310 is reset and abuts against the seating groove 211 again, closing the battery pack air inlet 220, so that the breathing explosion-proof valve can continue to work normally.

[0056] Preferably, an anti-corrosion layer is also provided on the baffle 310, so that when water vapor flows onto the baffle 310, the anti-corrosion layer can protect the baffle 310 from corrosion, thereby ensuring that the baffle 310 has stable magnetism and can stably cooperate with the external magnet, while ensuring the stable and normal operation of the breathing explosion-proof valve.

[0057] In order to ensure the sealing performance of the breathing explosion-proof valve, a second sealing ring 230 is further provided on the outer side of the base 200 to prevent gas leakage, thereby improving the sealing performance of the breathing explosion-proof valve.

[0058] The breathing explosion-proof valve provided by the present invention forms a ventilation channel 400 through the cooperation of the valve cover assembly 100 and the base 200, and the valve core assembly 300 cooperates with the ventilation channel 400 to realize the breathing of the battery pack air inlet 220 to balance the pressure difference in the battery pack and the release of high-pressure gas, while preventing the entry of water vapor. It can also quickly and conveniently perform air tightness testing without affecting the normal operation of the breathing explosion-proof valve, thereby improving the stability and reliability of the breathing explosion-proof valve.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A breathing explosion-proof valve, comprising a valve cover assembly, a base, and a valve core assembly disposed between the valve cover assembly and the base, characterized in that: The valve cover assembly is formed with an exhaust hole, the bottom of the base is formed with a battery pack air inlet, and the valve cover assembly and the base are connected to form a ventilation channel. The valve core assembly includes a baffle, a spring and a waterproof breathable membrane. The baffle is connected to the base, placed on the air inlet of the battery pack, and is configured to be magnetic. A breathable hole is formed in the middle. The waterproof breathable membrane covers the breathable hole. The spring is arranged on the baffle and cooperates with the valve cover assembly.

2. The explosion-proof breathing valve according to claim 1, characterized in that: The valve cover assembly includes an upper cover and a protective cover. The upper cover is provided with upper cover air holes. The protective cover is arranged on the upper cover and configured to cover part of the upper cover air holes to form the exhaust holes and the air permeable cavity.

3. The explosion-proof breathing valve according to claim 2, characterized in that: The base is configured with a T-shaped cross-section, and the upper area forms a connecting plate for cooperating with the upper cover. The middle area of ​​the connecting plate is formed with a placement groove that can accommodate the valve core assembly therein, and the placement groove extends toward the bottom of the base to form the battery pack air inlet.

4. The explosion-proof breathing valve according to claim 3, characterized in that: The upper cover and the connecting plate are configured to be detachably connected.

5. The explosion-proof breathing valve according to claim 3, characterized in that: A plurality of base air holes connected with the exhaust hole and the air-permeable cavity are evenly distributed on the periphery of the placement groove.

6. The explosion-proof breathing valve according to claim 3, characterized in that: A first sealing ring is provided on the outer side of the blocking piece.

7. The explosion-proof breathing valve according to claim 3, characterized in that: A second sealing ring is provided on the outer side of the base.

8. The explosion-proof breathing valve according to claim 6, characterized in that: An anti-corrosion layer is provided on the surface of the baffle.

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