Condensate-water-preventing breathing pressure release valve for power battery

Abstract

The utility model provides a power battery condensate water breathing prevention pressure release valve which comprises an upper cover and a lower cover which are coaxially arranged, the upper cover comprises a circular cover plate, a first cylindrical surface and a second cylindrical surface, and the first cylindrical surface and the second cylindrical surface are located in the center of the circular cover plate and axially extend towards the interior of a battery pack; an air inlet one-way valve is arranged between the first cylindrical surface and the second cylindrical surface; a blasting parachute valve is arranged on the outer side surface of the second cylindrical surface; the lower cover comprises an annular supporting plate and an annular first clamping ring which is located in the center of the supporting plate and protrudes towards the interior of the battery pack, and an air outlet one-way valve is clamped and fixed to the first clamping ring. The bidirectional water vapor blocking function is achieved through the air inlet one-way valve and the air outlet one-way valve, and the purpose of reducing water vapor in the battery pack is achieved; only when the pressure difference is large, the air inlet one-way valve or the air outlet one-way valve is opened, and air circulation is achieved. When the pressure difference is small, the air inlet one-way valve or the air outlet one-way valve is closed, long-time air circulation can be avoided, and condensation water gathering is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy automobile parts technical field especially, it relates to a power battery anti-condensation water breathing pressure relief valve. BACKGROUND

[0002] At present, in the field of new energy automobile parts battery pack industry, due to the variability of use condition and the uncontrollability of environment, the internal and external pressure of battery pack is different, a certain channel is needed to keep the balance of internal and external pressure, and when the internal pressure is sharply increased under the adverse conditions such as cell short circuit, overcharge or thermal runaway, enough exhaust capacity is needed to exhaust to ensure the safety of battery pack.

[0003] In the prior art, a pressure relief valve is arranged on the battery pack to achieve the above purpose, and currently, there are two structures of pressure relief valve: metal spring explosion-proof valve and plastic needle explosion-proof valve. Among them, the metal spring explosion-proof valve integrates breathing and explosion-proof functions, and seals by pulling the valve body by the spring, when the pressure difference between the internal pressure of battery pack and the external environment is small, the waterproof breathable membrane is used for breathing, when the pressure difference is large, the spring is opened to realize rapid pressure relief, the plastic needle explosion-proof valve is provided with a needle on the valve body, and a membrane material is arranged on the side of the valve body provided with the needle, when the pressure difference between the internal pressure of battery pack and the external environment is small, the waterproof breathable membrane is used for breathing, when the pressure difference is large, the breathable membrane is pierced by the needle to realize rapid pressure relief, but this type of pressure relief valve cannot be used again.

[0004] Moreover, the above two kinds of pressure relief valves do not have the function of isolating water vapor, which is easy to cause the generation of condensate water in the battery pack, and is easy to cause insulation failure, corrosion acceleration and other problems. INVENTION CONTENTS

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a power battery anti-condensation water breathing pressure relief valve.

[0006] To achieve the above purpose, the solution adopted by the utility model is as follows:

[0007] The utility model provides a power battery anti-condensation water breathing pressure relief valve, including coaxial arrangement's upper cover and lower cover, the top of upper cover is towards external environment, the bottom of lower cover is towards battery pack inside, wherein:

[0008] The upper cover includes a circular cover plate and a first cylindrical surface and a second cylindrical surface axially extending to the battery pack inside at the center position of the circular cover plate, and the diameter of the first cylindrical surface is smaller than that of the second cylindrical surface.

[0009] An air inlet check valve is arranged between the first cylindrical surface and the second cylindrical surface.

[0010] An explosion umbrella valve is arranged on the outer side of the second cylindrical surface;

[0011] The lower cover comprises a circular support plate and a circular first clamping ring protruding into the battery pack from the center of the support plate, and a one-way outlet valve is clamped on the first clamping ring.

[0012] Preferably, the upper cover further comprises a cylindrical skirt extending axially into the battery pack along the edge of the circular cover plate, and a first buckle is arranged on the inner side of the skirt for clamping the edge of the circular support plate of the lower cover on the upper cover.

[0013] Preferably, the one-way inlet valve comprises a first circular clamping portion, a first circular lip portion, and a first circular ring sector portion extending radially from the first circular clamping portion to the first circular lip portion, the diameter of the first circular clamping portion is smaller than the diameter of the first circular lip portion, the first circular clamping portion is clamped on the outer side of the first cylindrical surface, the first circular lip portion is in contact with the inner side of the second cylindrical surface, and the first circular clamping portion is close to the side of the ambient environment and the first circular lip portion is away from the side of the ambient environment.

[0014] Preferably, a first vent hole is arranged on the circular cover plate, and the first vent hole is arranged between the first cylindrical surface and the second cylindrical surface; when the pressure of the ambient environment is greater than the pressure inside the battery pack by a certain value, ambient air enters the battery pack from the first vent hole, pushing away the first circular lip portion of the one-way inlet valve.

[0015] Preferably, a protective cover is arranged on the side close to the ambient environment of the circular cover plate of the upper cover, and a second vent hole is arranged on the protective cover; a waterproof and breathable film is further arranged between the circular cover plate of the upper cover and the protective cover.

[0016] Preferably, the protective cover comprises a second circular cover body and a plurality of second buckles uniformly distributed on the outer side of the second circular cover body; a clamping portion corresponding to the second buckles of the protective cover is arranged on the side close to the ambient environment of the circular cover plate of the upper cover.

[0017] Preferably, the circular cover plate of the upper cover comprises a first circular cover body and a plurality of connecting portions uniformly distributed on the outer side of the first circular cover body, and the clamping portion is arranged on the connecting portion.

[0018] Preferably, a circular sunken groove is arranged on the side close to the ambient environment at the center of the first circular cover body of the upper cover, and the first vent hole is arranged in the circular sunken groove; a "cross" welding rib for ultrasonic welding of the waterproof and breathable film is further arranged in the circular sunken groove.

[0019] Preferably, a circular annular second clamping ring is further arranged between the circular annular support plate and the circular annular first clamping ring on the lower cover, and the diameter of the second clamping ring is greater than that of the first clamping ring; the first clamping ring and the second clamping ring are connected by a first connecting rib, and the second clamping ring and the circular annular support plate are connected by a second connecting rib.

[0020] Preferably, the air outlet one-way valve comprises a second circular clamping portion with a small diameter, a second circular lip portion with a large diameter, and a second circular annular sector portion extending radially from the second circular clamping portion to the second circular lip portion, the second circular clamping portion is away from the side close to the external environment, and the second circular lip portion is close to the side close to the external environment; the second circular clamping portion is clamped on the first clamping ring of the lower cover, and the second circular lip portion is in contact with the inner side of the first columnar surface of the upper cover; when the external environment pressure is less than the internal pressure of the battery pack by a certain value, the second circular lip portion of the air outlet one-way valve is pushed away, and the gas is discharged from the second circular lip portion of the air outlet one-way valve, the first vent hole of the upper cover, and the second vent hole of the protective cover.

[0021] Preferably, a circular annular step is arranged on the outer side of the second columnar surface; the burst umbrella valve comprises a third circular clamping portion, a third circular lip portion, and a third circular annular sector portion extending radially from the third circular clamping portion to the third circular lip portion, the diameter of the third circular clamping portion is smaller than that of the third circular lip portion, the third circular clamping portion is away from the side close to the external environment, and the third circular lip portion is close to the side close to the external environment; the third circular clamping portion is arranged on the circular annular step, the second clamping ring of the lower cover is crimped on the third circular clamping portion, and the third circular lip portion is in contact with the edge of the circular cover plate of the upper cover close to the first circular cover body; when the battery pack is in thermal runaway, the internal pressure of the battery pack rises extremely fast and is much greater than the external environment pressure, the third circular lip portion of the burst umbrella valve is pushed away, the gas enters the gap between the two connecting portions of the circular cover plate of the upper cover and is discharged, and at the same time, the second circular lip portion of the air outlet one-way valve is also pushed away, and the gas is discharged from the air outlet one-way valve.

[0022] Preferably, a circular annular fixing portion is arranged on the circular annular support plate of the lower cover, a clamping groove for fixing the power battery anti-condensation breathing pressure relief valve on the new energy automobile power battery accessory is arranged on the circular annular fixing portion, and an annular sealing ring is arranged on the circular annular fixing portion of the lower cover, close to the side of the internal battery pack, for sealing between the power battery anti-condensation breathing pressure relief valve and the new energy automobile power battery accessory.

[0023] Beneficial effects

[0024] The utility model provides a kind of power battery anti-condensation water breathing pressure relief valve, two-way water vapor function is realized by air inlet check valve and air outlet check valve, reach the purpose of reducing battery pack internal water vapor;And only when pressure difference is certain, air inlet check valve or air outlet check valve opens, realizes the circulation of gas;When pressure difference is small, air inlet check valve or air outlet check valve is closed, can avoid long time gas circulation, reduce the aggregation of condensate. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the three-dimensional exploded structure schematic view of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0026] Figure 2 It is the sectional view of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0027] Figure 3 It is the sectional view of the power battery anti-condensation water breathing pressure relief valve of the utility model when external environment pressure is greater than battery pack internal pressure certain value.

[0028] Figure 4 It is the sectional view of the power battery anti-condensation water breathing pressure relief valve of the utility model when external environment pressure is less than battery pack internal pressure certain value.

[0029] Figure 5 It is the sectional view of the power battery anti-condensation water breathing pressure relief valve of the utility model when battery pack occurs thermal runaway.

[0030] Figure 6 It is the three-dimensional structure schematic view of one angle of the upper cover of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0031] Figure 7 It is the three-dimensional structure schematic view of another angle of the upper cover of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0032] Figure 8 It is the three-dimensional structure schematic view of air inlet check valve of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0033] Figure 9 It is the three-dimensional structure schematic view of protective cover of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0034] Figure 10 It is the three-dimensional structure schematic view of lower cover of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0035] Figure 11 It is the three-dimensional structure schematic view of air outlet check valve of the power battery anti-condensation water breathing pressure relief valve of the utility model.

[0036] Figure 12 The utility model relates to the three -dimensional structure schematic diagram of the bursting umbrella valve of power battery anti -condensation water breathing pressure relief valve. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. The components of the utility model embodiment described and shown in the drawing here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiment of the utility model provided in the drawing is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0039] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0040] In the description of the utility model, it needs to be explained that, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawing, or the orientation or position relationship commonly placed when the utility model product is used, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the utility model, still need to explain, unless another explicit provision and limitation, term "arrangement", "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can through intermediate medium indirectly connect, can be two element inside intercommunication. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model with specific circumstances.

[0043] To this end, the following solutions are proposed:

[0044] Referring to Figure 1 , the utility model provides a power battery prevents condensate water breathing pressure relief valve, including coaxial arrangement's upper cover 100 and lower cover 200, wherein, the top of upper cover 100 is towards external environment, the bottom of lower cover 200 is towards battery pack interior.

[0045] Specifically, as Figure 6 , Figure 7 Indicated, the upper cover 100 includes circular cover plate 101, cylindrical skirt 102 along the edge of the circular cover plate 101 extends to the battery pack interior axial direction and is located at the center position of the circular cover plate 101, the first cylindrical surface 103 and the second cylindrical surface 104 extend to the battery pack interior axial direction, wherein the diameter of the first cylindrical surface 103 is smaller than the diameter of the second cylindrical surface 104.

[0046] In the utility model's a kind of power battery prevents condensate water breathing pressure relief valve, air inlet check valve 300 is arranged between the first cylindrical surface 103 and the second cylindrical surface 104.Combined Figure 1 , Figure 8 , the air inlet check valve 300 includes first circular clamping portion 301, first circular lip portion 302 and first circular ring sector portion 303 radially extended by first circular clamping portion 301 to first circular lip portion, wherein the diameter of the first circular clamping portion 301 is smaller than the diameter of the first circular lip portion 302, the first circular clamping portion 301 is clamped on the outside of the first cylindrical surface 103, the first circular lip portion 302 is in contact with the inside of the second cylindrical surface 104, the first circular clamping portion 301 is close to the side of external environment, and the first circular lip portion 302 is away from the side of external environment.

[0047] Further, two circles of first air holes 1010 are provided on the circular cover plate 101 of the upper cover 100, the outer circle of first air holes 1010 is arranged between the first cylindrical surface 103 and the second cylindrical surface 104, and the inner circle of first air holes 1010 is arranged on the inside of the first cylindrical surface 103.

[0048] In some embodiments, the air inlet check valve 300 is made of elastic rubber. Combined Figure 3When the external environment pressure is greater than the internal pressure of the battery pack by a certain value, external air enters from the outer ring first air hole 1010 on the circular cover plate 101 of the upper cover 100, pushes away the first circular lip 302 of the air inlet one-way valve 300, and enters the internal part of the battery pack, thereby realizing gas circulation.

[0049] Further, a protection cover 400 is arranged on the circular cover plate 101 of the upper cover 100, close to the side of the external environment, and a second air hole 401 is arranged on the protection cover 400. A waterproof and breathable film 500 is further arranged between the circular cover plate 101 of the upper cover 100 and the protection cover 400.

[0050] In some embodiments, in combination with Figure 1 and Figure 9 , the protection cover 400 comprises a second circular cover body 402 and a plurality of second buckles 403 uniformly distributed on the outer side of the second circular cover body 402. As shown in Figure 6 , Figure 7 , the circular cover plate 101 of the upper cover 100 comprises a first circular cover body 1011 and a plurality of connecting parts 1012 uniformly distributed on the outer side of the first circular cover body 1011. A clamping part 1013 corresponding to the second buckle 403 of the protection cover 400 is arranged on the circular cover plate 101 of the upper cover 100, close to the side of the external environment. The clamping part 1013 is arranged on the connecting part 1012 of the circular cover plate 101, and a gap A is formed between adjacent two connecting parts 1012.

[0051] In some embodiments, as shown in Figure 6 , a circular sunken groove 1014 is arranged on the first circular cover body 1011 of the upper cover 100, close to the side of the external environment, and the first air hole 1010 is arranged in the circular sunken groove 1014. A “cross” welding rib 1015 for ultrasonic welding of the waterproof and breathable film 500 is further arranged in the circular sunken groove 1014.

[0052] In combination with Figure 1 , Figure 3 , Figure 6 and Figure 9As shown, the waterproof and breathable membrane 500 is ultrasonically welded on the side of the upper cover 100 close to the external environment and covers the circular sunken groove 1014 of the first circular cover body 1011 of the upper cover 100, forming a gap B between the circular sunken groove 1014 and the "cross" welding rib 1015. Then, the protective cover 400 is buckled on the clamping portion 1013 of the upper cover 100 close to the external environment. When the external environment pressure is greater than the internal pressure of the battery pack by a certain value, the external air enters from the second air hole 401 of the protective cover 400, passes through the waterproof and breathable membrane 500, passes through the gap B, then enters from the outer ring first air hole 1010 on the circular cover plate 101 of the upper cover 100, pushes away the first circular lip portion 302 of the air inlet one-way valve 300, and enters the internal part of the battery pack, thereby realizing the circulation of gas.

[0053] In the power battery anti-condensation water breathing pressure relief valve, in combination with Figure 1 and Figure 10 , the lower cover 200 includes a circular ring-shaped support plate 201 and a circular ring-shaped first clamping ring 202 located at the center position of the support plate 201 and protruding into the internal part of the battery pack, and the first clamping ring 202 clamps the air outlet one-way valve 600. Figure 11 As shown, the air outlet one-way valve 600 includes a second circular clamping portion 601, a second circular lip portion 602, and a second circular ring sector portion 603 radially extending from the second circular clamping portion 601 to the second circular lip portion 602, and the diameter of the second circular clamping portion 601 is smaller than the diameter of the second circular lip portion 602. In some embodiments, the air outlet one-way valve 600 is made of elastic rubber material. The second circular clamping portion 601 of the air outlet one-way valve 600 is away from the side close to the external environment, and the second circular lip portion 602 is close to the side close to the external environment.

[0054] In combination with Figure 4 As shown, the second circular clamping portion 601 of the air outlet one-way valve 600 is clamped on the first clamping ring 202 of the lower cover 200, and the second circular lip portion 602 is in contact with the inner side of the first cylindrical surface 103 of the upper cover 100. When the external environment pressure is less than the internal pressure of the battery pack by a certain value, the second circular lip portion 602 of the air outlet one-way valve 600 is pushed away, and the gas enters from the gap between the second circular lip portion 602 of the air outlet one-way valve 600 and the inner side of the first cylindrical surface 103 of the upper cover 100, passes through the inner ring first air hole 1010 on the circular cover plate 101 of the upper cover 100, passes through the gap B, and finally is discharged from the second air hole 401 of the protective cover 400, thereby realizing the circulation of gas.

[0055] As shown in Figure 2As shown, when the external environment pressure is not much different from the internal pressure of the battery pack, the air inlet one-way valve 300 and the air outlet one-way valve 600 are closed, the power battery anti-condensation water breathing pressure relief valve of the utility model keeps a sealed state, thereby preventing water vapor from entering the internal part of the battery pack, and long-time gas circulation and condensate water accumulation can be avoided.

[0056] In the power battery anti-condensation water breathing pressure relief valve of the utility model, in combination with Figure 1 and Figure 12 The upper cover 100 is further provided with a burst umbrella valve 700 on the outer side of the second cylindrical surface 104, the burst umbrella valve 700 comprises a third circular clamping portion 701, a third circular lip portion 702 and a third circular ring sector portion 703 radially extending from the third circular clamping portion 701 to the third circular lip portion 702, and the diameter of the third circular clamping portion 701 is smaller than that of the third circular lip portion 702.

[0057] Further, in some embodiments, in combination with Figures 1-5 、 Figure 7 、 Figure 10 As shown, the upper cover 100 is provided with a circular ring step 1041 on the outer side of the second cylindrical surface 104. Between the circular ring support plate 201 and the circular ring first clamping ring 202 on the lower cover 200, a circular ring second clamping ring 203 is further arranged, the diameter of the second clamping ring 203 is larger than that of the first clamping ring 202, the first clamping ring 202 and the second clamping ring 203 are connected through the first connecting rib 204, the second clamping ring 203 and the circular ring support plate 201 are connected through the second connecting rib 205, and the space C is formed between the first connecting rib 204, the second connecting rib 205 and the first clamping ring 202 and the second clamping ring 203.

[0058] In some embodiments, the third circular clamping portion 701 of the burst umbrella valve 700 is arranged on the circular ring step 1041 of the second cylindrical surface 104 of the upper cover 100, the second clamping ring 203 of the lower cover 200 is press-bonded on the third circular clamping portion 701, and the third circular lip portion 702 is in contact with the edge of the circular cover plate 101 of the upper cover 100 close to the first circular cover body 1011.

[0059] As Figure 5As shown, when the battery pack is in thermal runaway, the internal pressure of the battery pack rises rapidly, which is much greater than the external environment pressure, the third circular lip 702 of the burst umbrella valve 700 is pushed open, the gas enters the gap C from the third circular lip of the burst umbrella valve 700 and is discharged, at the same time, the second circular lip 602 of the gas outlet check valve 600 is also pushed open, the gas enters from the gap between the second circular lip 602 of the gas outlet check valve 600 and the inner side of the first cylindrical surface 103 of the upper cover 100, passes through the inner ring first vent hole 1010 on the circular cover plate 101 of the upper cover 100, passes through the gap B, and finally is discharged from the second vent hole 401 of the protective cover 400, so that rapid pressure relief is realized.

[0060] In the power battery anti-condensation breathing pressure relief valve, in combination with Figure 1 and Figure 10 A circular ring fixing part 2011 is arranged on the circular ring support plate 201 of the lower cover 200, a clamping groove 2012 for fixing the power battery anti-condensation breathing pressure relief valve of the utility model on the new energy automobile power battery accessory is arranged on the circular ring fixing part 2011, and an annular sealing ring 800 is arranged on the circular ring fixing part 2011 of the lower cover 200, close to the side of the battery pack interior, for sealing between the power battery anti-condensation breathing pressure relief valve and the new energy automobile power battery accessory.

[0061] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A condensation water preventing breather pressure relief valve for a power battery, characterized by, The upper cover and the lower cover are coaxially arranged, the top of the upper cover is towards the external environment, and the bottom of the lower cover is towards the inside of the battery pack. The upper cover comprises a circular cover plate, a first cylindrical surface and a second cylindrical surface which are axially extended towards the inside of the battery pack and are located at the central position of the circular cover plate, and the diameter of the first cylindrical surface is smaller than that of the second cylindrical surface. An air inlet check valve is arranged between the first cylindrical surface and the second cylindrical surface. An explosion umbrella valve is arranged on the outer side of the second cylindrical surface. The lower cover comprises a circular annular support plate and a circular annular first clamping ring which is protruded towards the inside of the battery pack and is located at the central position of the support plate, and an air outlet check valve is clamped on the first clamping ring.

2. The condensation-preventing breather relief valve for power batteries according to claim 1, characterized in that, The upper cover further comprises a cylindrical skirt which is axially extended towards the inside of the battery pack along the edge of the circular cover plate, and a first buckle is arranged on the inner side of the skirt for clamping the edge of the circular annular support plate of the lower cover on the upper cover.

3. The condensation-preventing breather relief valve for power batteries according to claim 1, characterized in that, The air inlet check valve comprises a first circular clamping part, a first circular lip part and a first circular ring sector part which is radially extended from the first circular clamping part to the first circular lip part, the diameter of the first circular clamping part is smaller than that of the first circular lip part, the first circular clamping part is clamped on the outer side of the first cylindrical surface, the first circular lip part is in contact with the inner side of the second cylindrical surface, and the first circular clamping part is close to the side of the external environment and the first circular lip part is away from the side of the external environment.

4. The condensation-preventing breathing relief valve for power batteries according to claim 3, characterized in that, A first vent hole is arranged on the circular cover plate, and the first vent hole is arranged between the first cylindrical surface and the second cylindrical surface; when the pressure of the external environment is greater than the pressure of the inside of the battery pack by a certain value, external air enters the inside of the battery pack from the first vent hole and pushes away the first circular lip part of the air inlet check valve.

5. The condensation-preventing breather relief valve for power batteries according to claim 4, characterized in that, A protection cover is arranged on the circular cover plate of the upper cover and close to the side of the external environment, a second vent hole is arranged on the protection cover, and a waterproof and breathable film is further arranged between the circular cover plate of the upper cover and the protection cover.

6. The condensation-preventing breather relief valve for power batteries according to claim 5, characterized in that, The protection cover comprises a second circular cover body and a plurality of second buckles which are uniformly distributed on the outer side of the second circular cover body, and a clamping part corresponding to the second buckles of the protection cover is arranged on the circular cover plate of the upper cover and close to the side of the external environment.

7. The condensation-preventing breather relief valve for power batteries according to claim 6, characterized in that, The circular cover plate of the upper cover comprises a first circular cover body and a plurality of connecting parts which are uniformly distributed on the outer side of the first circular cover body, and the clamping part is arranged on the connecting part.

8. The condensation-preventing breather relief valve for power batteries according to claim 7, characterized in that, A circular sunken groove is arranged on the first circular cover body of the upper cover and close to the side of the external environment, the first vent hole is arranged in the circular sunken groove, and a "cross" welding rib for ultrasonic welding of the waterproof and breathable film is further arranged in the circular sunken groove.

9. The condensation-preventing breather relief valve for power batteries according to claim 8, characterized in that, A circular annular second clamping ring is further arranged between the circular annular support plate and the circular annular first clamping ring of the lower cover, the diameter of the second clamping ring is greater than that of the first clamping ring, the first clamping ring and the second clamping ring are connected through a first connecting rib, and the second clamping ring and the circular annular support plate are connected through a second connecting rib.

10. The condensation-preventing breather relief valve for power batteries according to claim 9, characterized in that, The air outlet one-way valve comprises a second circular clamping part with a small diameter, a second circular lip part with a large diameter, and a second circular ring sector part extending radially from the second circular clamping part to the second circular lip part, the second circular clamping part being away from the side close to the external environment, and the second circular lip part being close to the side close to the external environment; the second circular clamping part is clamped on the first clamping ring of the lower cover, and the second circular lip part is in contact with the inner side of the first columnar surface of the upper cover; when the external environment pressure is less than the internal pressure of the battery pack by a certain value, the second circular lip part of the air outlet one-way valve is pushed away, and the gas is discharged from the second circular lip part of the air outlet one-way valve, the first vent hole of the upper cover, and the second vent hole of the protective cover.

11. The condensation-preventing breather relief valve for power batteries according to claim 9, characterized in that, A circular ring step is arranged on the outer side of the second columnar surface; the burst umbrella valve comprises a third circular clamping part, a third circular lip part, and a third circular ring sector part extending radially from the third circular clamping part to the third circular lip part, the diameter of the third circular clamping part being smaller than that of the third circular lip part, the third circular clamping part being away from the side close to the external environment, and the third circular lip part being close to the side close to the external environment; the third circular clamping part is arranged on the circular ring step, the second clamping ring of the lower cover is crimped on the third circular clamping part, and the third circular lip part is in contact with the edge of the circular cover plate of the upper cover close to the first circular cover body; when the battery pack is in thermal runaway, the internal pressure of the battery pack rises extremely fast and is much greater than the external environment pressure, the third circular lip part of the burst umbrella valve is pushed away, the gas enters the gap between the two connecting parts of the circular cover plate of the upper cover, and at the same time, the second circular lip part of the air outlet one-way valve is also pushed away, and the gas is discharged from the air outlet one-way valve.

12. The condensation-preventing breather relief valve for power batteries according to claim 1, characterized in that, A circular ring fixing part is arranged on the circular ring support plate of the lower cover, a clamping groove for fixing the power battery anti-condensation breathing pressure relief valve on the new energy automobile power battery accessory is arranged on the circular ring fixing part, and an annular sealing ring is arranged on the circular ring fixing part of the lower cover, close to the side close to the internal part of the battery pack, for sealing between the power battery anti-condensation breathing pressure relief valve and the new energy automobile power battery accessory.

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