Moisture-proof explosion-proof valve for battery pack

Abstract

The utility model discloses a battery pack moisture-proof explosion-proof valve, the battery pack moisture-proof explosion-proof valve comprises a valve body, a cover body, a water absorption piece and a breathable film, the valve body is detachably installed on a battery shell, and the valve body is provided with a first gas channel communicated with the battery shell; the cover body is movably mounted on the valve body and used for opening or closing the first gas channel, the cover body is provided with a mounting space, a second gas channel and a third gas channel, one end of the second gas channel is communicated with the battery shell, and the other end of the second gas channel is communicated with the mounting space; the third gas channel is communicated between the mounting space and the external space; the water absorption piece is installed in the installation space, and the breathable film is installed on the cover body and used for sealing the second gas channel. According to the moisture-proof explosion-proof valve for the battery pack provided by the utility model, condensation entering the battery pack can be well reduced, and high-temperature and high-pressure gas in the battery pack can be exhausted when the battery pack is subjected to thermal runaway, so that the risk of fire and explosion of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the field of valve bodies, and particularly relates to a moisture-proof explosion-proof valve for a battery pack. Background Art

[0002] With the rise of new energy vehicles, the designs of battery packs are diverse. Factors such as energy density and electric vehicle platforms determine different battery pack designs. With the accelerated industrialization of the power battery industry, the safety design of battery packs has become a hot topic of current research, and in particular, the condensation problem of battery packs has become particularly important. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, an object of the utility model is to provide a moisture-proof explosion-proof valve for a battery pack. The moisture-proof explosion-proof valve for the battery pack can not only better reduce the entry of condensation into the battery pack, but also discharge the high-temperature and high-pressure gas in the battery pack when the battery pack undergoes thermal runaway, thereby reducing the risk of fire and explosion of the battery pack.

[0004] The moisture-proof explosion-proof valve for a battery pack according to an embodiment of the utility model includes: a valve body detachably mounted on a battery housing, the valve body having a first gas passage communicating with the battery housing; a cover movably mounted on the valve body for opening or closing the first gas passage, wherein the cover has an installation space, a second gas passage, and a third gas passage, one end of the second gas passage communicates with the battery housing, the other end of the second gas passage communicates with the installation space, and the third gas passage communicates between the installation space and the external space; a water-absorbing member and a breathable membrane, the water-absorbing member is installed in the installation space, and the breathable membrane is installed on the cover to seal the second gas passage.

[0005] For the moisture-proof explosion-proof valve for a battery pack according to an embodiment of the utility model, by providing a first gas passage on the valve body, the high-temperature and high-pressure gas in the battery housing can be discharged preferably when the battery undergoes thermal runaway, and the risk of fire and explosion of the battery pack can be preferably avoided; by providing an installation space, a second gas passage, and a third gas passage on the cover, providing a water-absorbing member in the installation space, and providing a breathable membrane to seal the second gas passage, small particulate water droplets and gas from the outside can be preferably prevented from entering the battery housing, and the insulation of the inside of the battery pack can be ensured.

[0006] In addition, the moisture-proof explosion-proof valve for a battery pack according to the utility model may further have the following additional technical features:

[0007] In some embodiments of the present utility model, the cover body includes: a support member having a first groove with an opening facing away from the battery housing, a hollow first cylinder provided on the bottom wall of the first groove, and a first sub-channel of the second gas channel located within the first cylinder; a valve cover installed at the opening of the support member to define the installation space between the valve cover and the support member, with the first cylinder and the valve cover spaced apart to communicate the installation space and the second gas channel.

[0008] In some embodiments of the present utility model, a third gas channel is provided within the support member, extending in a direction parallel to the bottom wall of the first groove, and in the depth direction of the first groove, the inlet of the third gas channel is adjacent to the bottom wall of the first groove.

[0009] In some embodiments of the present utility model, the water-absorbing member is in the shape of a ring surrounding the outer peripheral side of the first cylinder.

[0010] In some embodiments of the present utility model, the valve body includes a connected inner ring valve body and outer ring valve body, with a first gas channel defined between the inner ring valve body and the outer ring valve body. An installation channel is provided within the inner ring valve body, and the support member has a second cylinder installed within the installation channel. The first cylinder and the second cylinder are coaxially arranged, and the second gas channel includes a second sub-channel located within the second cylinder, with the first sub-channel and the second sub-channel communicating.

[0011] In some embodiments of the present utility model, the valve body further includes a sleeve installed on the outer peripheral side of the inner ring valve body. The end of the sleeve away from the cover body has an air inlet. The cover body further includes a movable column connected to the second cylinder, and an elastic member is provided between the movable column and the inner ring valve body. The elastic member is used to keep the cover body in a closed state for closing the first gas channel, and the second gas channel includes a third sub-channel located within the movable column.

[0012] In some embodiments of the present utility model, the valve body further includes a blocking member installed at the air inlet of the sleeve for blocking a part of the air inlet.

[0013] In some embodiments of the present utility model, the blocking member includes a fixed shaft extending in a first direction and a plurality of blades installed on the fixed shaft. The plurality of blades are spaced apart along the axial and circumferential directions of the fixed shaft, and the dimension of each blade in the radial direction of the fixed shaft is greater than the width of the first gas channel.

[0014] In some embodiments of the present utility model, the valve body has a second groove with an opening facing the cover body. The first gas passage penetrates through the bottom wall of the second groove. At least a part of the cover body is located within the second groove, and the outlet of the third gas passage faces the side wall of the second groove.

[0015] In some embodiments of the present utility model, a first seal is provided between the valve body and the cover body, and the first seal is used to seal the gap between the valve body and the cover body.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 is a schematic structural view of a moisture-proof and explosion-proof valve for a battery pack according to an embodiment of the present utility model from one angle.

[0019] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0020] Figure 3 is an exploded view of a moisture-proof and explosion-proof valve for a battery pack according to an embodiment of the present utility model.

[0021] Figure 4 is a schematic structural view of a moisture-proof and explosion-proof valve for a battery pack according to an embodiment of the present utility model from another angle.

[0022] Figure 5 is a schematic structural view of the valve body of a moisture-proof and explosion-proof valve for a battery pack according to an embodiment of the present utility model.

[0023] Reference Signs:

[0024] Moisture-proof and explosion-proof valve for battery pack 100,

[0025] Valve body 1, first gas passage 11, inner ring valve body 12, installation passage 121, outer ring valve body 13, sleeve 14, air inlet 141, blocking member 15, fixed shaft 151, blade 152,

[0026] Cover body 2, installation space 21, second gas passage 22, third gas passage 23,

[0027] Support member 24, first groove 241, first cylinder 242, second cylinder 243,

[0028] Valve cover 25, movable column 26, water absorption member 3, breathable membrane 4, first seal 5, second seal 6, elastic member 7. Detailed implementation mode

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] With the rise of new energy vehicles, the designs of battery packs are diverse. Factors such as energy density and electric vehicle platforms determine different battery pack designs. With the acceleration of the industrialization of the power battery industry, the safety design of battery packs has become a hot topic of current research, especially the condensation problem of battery packs has become particularly important.

[0033] The present invention proposes a moisture-proof and explosion-proof valve 100 for a battery pack, which can not only better reduce the entry of condensation into the battery pack, but also discharge the high-temperature and high-pressure gas in the battery pack when the battery pack undergoes thermal runaway, thereby reducing the risk of fire and explosion of the battery pack.

[0034] The following reference Figures 1 - 5Describe the moisture-proof explosion-proof valve 100 of the battery pack according to the embodiments of the present utility model.

[0035] As Figures 1 - 5 shown, the moisture-proof explosion-proof valve 100 of the battery pack according to the embodiments of the present utility model includes: a valve body 1, a cover body 2, a water-absorbing member 3, and a breathable film 4. The valve body 1 is detachably mounted on the battery housing. The valve body 1 has a first gas passage 11 communicating with the battery housing. The cover body 2 is movably mounted on the valve body 1 for opening or closing the first gas passage 11. Among them, the cover body 2 has an installation space 21, a second gas passage 22, and a third gas passage 23. One end of the second gas passage 22 communicates with the battery housing, and the other end of the second gas passage 22 communicates with the installation space 21. The third gas passage 23 communicates between the installation space 21 and the external space. The water-absorbing member 3 is installed in the installation space 21, and the breathable film 4 is installed on the cover body 2 for closing the second gas passage 22.

[0036] That is to say, under normal conditions, the cover body 2 is used to close the first gas passage 11 of the valve body 1. When the gas pressure inside the battery housing or the gas pressure outside the battery housing changes, the gas can pass through the gas interaction formed by the second gas passage 22, the installation space 21, and the third gas passage 23. Exemplarily, when the gas pressure outside the battery housing is greater than the gas pressure inside the battery housing, the external air can enter the battery housing in sequence through the third gas passage 23, the installation space 21, and the second gas passage 22. By providing the breathable film 4, small particle water droplets in the gas can be avoided from entering the battery housing when passing through the gas passage. Moreover, during the process of the external air flowing towards the inside of the battery housing, the water-absorbing member 3 can absorb small particle water droplets in the gas before the breathable film 4. When the water-absorbing member 3 absorbs small particle water droplets, it can expand, and multiple small particle water droplets can converge into large particle water droplets. Exemplarily, the water-absorbing member 3 is a foam. After the foam absorbs a certain amount of small particle water droplets and expands, due to the space limitation of the installation space 21, the large particle water droplets gathered on the foam will be extruded out, and the large particle water droplets can also flow out from the third gas passage 23, thereby reducing the possibility of water droplets entering the battery pack and causing internal insulation failure of the battery pack.

[0037] After thermal runaway occurs inside the battery housing, a large amount of high-temperature and high-pressure gas will be generated inside the battery housing. The high-temperature and high-pressure gas can push the cover body 2 open, so that it can quickly flow out from the first gas passage 11, which can better avoid the risk of the battery pack catching fire and exploding.

[0038] According to the moisture-proof explosion-proof valve 100 of the embodiment of the present utility model, by providing a first gas passage 11 on the valve body 1, it can preferably discharge the high-temperature and high-pressure gas in the battery housing when the battery undergoes thermal runaway, and can preferably avoid the risk of the battery pack catching fire and exploding; by providing an installation space 21, a second gas passage 22 and a third gas passage 23 on the cover body 2, and providing a water-absorbing member 3 in the installation space 21, and providing a breathable film 4 to seal the second gas passage 22, it can preferably prevent small particle water droplets and gas from the outside from entering the battery housing, and can ensure the insulation of the inside of the battery pack.

[0039] In some embodiments of the present utility model, as Figures 1 - 5 shown, the cover body 2 includes a support member 24 and a valve cover 25. The support member 24 has a first groove 241. The opening of the first groove 241 faces away from the battery housing. A hollow first column 242 is provided on the bottom wall of the first groove 241. The second gas passage 22 includes a first sub-passage located in the first column 242. The valve cover 25 is installed at the opening of the support member 24 to construct an installation space 21 between the valve cover 25 and the support member 24. The first column 242 and the valve cover 25 are spaced apart to communicate the installation space 21 and the second gas passage 22.

[0040] As Figures 1 - 5 shown, the opening of the first opening faces upward. A hollow first column 242 is provided in the middle of the first groove 241. By spacing the first column 242 and the valve cover 25 apart, the installation space 21 and the second gas passage 22 can be communicated, so as to realize the communication between the inside and the outside of the battery housing. When the water-absorbing member 3 absorbs a certain amount of water droplets and squeezes out the water, due to the first column 242, the water is not easily introduced into the second gas passage 22 in the installation space 21, and thus a better blocking effect on water can be achieved.

[0041] In some embodiments of the present utility model, as Figures 1 - 5 shown, a third gas passage 23 is provided in the support member 24. The third gas passage 23 extends in a direction parallel to the bottom wall of the first groove 241, and in the depth direction of the first groove 241, the inlet of the third gas passage 23 is adjacent to the bottom wall of the first groove 241. As Figures 1 - 5 shown, the third gas passage 23 extends in the left-right direction, and the inlet of the third gas passage 23 is adjacent to the bottom wall of the first groove 241. In this way, the water accumulated in the first groove 241 can be preferably discharged through the third gas passage 23.

[0042] Exemplarily, a plurality of third gas passages 23 are provided, and the plurality of third gas passages 23 are spaced apart circumferentially.

[0043] In some embodiments of the present utility model, as Figures 1 - 5As shown, the water-absorbing member 3 is annular and surrounds the outer peripheral side of the first cylinder 242. Thus, the water absorption capacity of the water-absorbing member 3 can be increased. In addition, the water-absorbing member 3 is equivalent to being sleeved on the outer periphery of the first cylinder 242. In this way, after the water-absorbing member 3 absorbs water, the expansion direction of the water-absorbing member 3 will expand along the axial direction of the first cylinder 242, so that the water-absorbing member 3 can be better squeezed after absorbing a certain amount of water, and the water in the water-absorbing member 3 can be better squeezed out, thereby realizing the cyclic water absorption function of the water-absorbing member 3.

[0044] In some embodiments of the present invention, as Figures 1 - 5 shown, the valve body 1 includes a connected inner ring valve body 12 and an outer ring valve body 13. A first gas passage 11 is formed between the inner ring valve body 12 and the outer ring valve body 13. An installation passage 121 is provided in the inner ring valve body 12. The support member 24 has a second cylinder 243 installed in the installation passage 121. The first cylinder 242 and the second cylinder 243 are coaxially arranged. The second gas passage 22 includes a second sub-passage located in the second cylinder 243. The first sub-passage and the second sub-passage are communicated. That is to say, the inner ring valve body 12 can cooperate well with the second cylinder 243, and can better realize the positioning function of the cover body 2. Thus, the assembly efficiency of the cover body 2 can be improved.

[0045] Exemplarily, the breathable film 4 is installed at the opening at the lower end of the second cylinder 243.

[0046] Furthermore, as Figures 1 - 5 shown, the valve body 1 further includes a sleeve 14 installed on the outer peripheral side of the inner ring valve body 12. The end of the sleeve 14 away from the cover body 2 has an air inlet 141. The cover body 2 further includes a movable column 26 connected to the second cylinder 243. An elastic member 7 is provided between the movable column 26 and the inner ring valve body 12. The elastic member 7 is used to keep the cover body 2 in a closed state of closing the first gas passage 11. The second gas passage 22 includes a third sub-passage located in the movable column 26.

[0047] That is to say, the first sub-channel, the second sub-channel, and the third sub-channel jointly construct the second gas channel 22. Moreover, through the cooperation of the movable column 26 and the inner ring valve body 12, the elastic member 7 can preferably keep the cover body 2 in a closed state to close the first gas channel 11. When thermal runaway occurs inside the battery housing, the high-temperature and high-pressure gas can overcome the elastic force of the elastic member 7, that is, the high-temperature and high-pressure gas can push the movable column 26, causing the movable column 26 to move upward and compress the elastic member 7. The upward movement of the movable column 26 causes the support member 24 and the valve cover 25 to both move upward, thereby opening the first gas channel 11. At this time, the high-temperature and high-pressure gas can quickly discharge from the first gas channel 11. During the process of the gas inside the battery housing gradually stabilizing, the elastic member 7 can recover its elastic deformation, and then the elastic member 7 pushes the movable column 26 to move downward, thereby driving the support member 24 and the valve cover 25 to both move downward, causing the first gas channel 11 to be closed again. Thus, not only can the high-temperature and high-pressure gas inside the battery housing be preferably discharged, but also the external gas can be preferably prevented from entering the battery housing through the first gas channel 11.

[0048] Exemplarily, the elastic member 7 can be a spring, and the spring is sleeved on the outer peripheral side of the movable column 26. Thus, the spring is relatively stable when deforming and recovering deformation.

[0049] In some embodiments of the present invention, as Figures 1 - 5 shown, the valve body 1 further includes a blocking member 15, and the blocking member 15 is installed at the air inlet 141 of the sleeve 14 for blocking a part of the air inlet 141. That is to say, when thermal runaway occurs inside the battery housing, the melt can be blocked by the blocking member 15, and the melt entering the second gas channel 22 from the air inlet 141 can be reduced. In this way, the air inlet 141 and the second gas channel 22 are not easily blocked, and the battery pack moisture-blocking explosion-proof valve 100 can continue to be used after discharging the high-temperature and high-pressure gas.

[0050] Optionally, as Figures 1 - 5 shown, the blocking member 15 includes a fixed shaft 151 extending in the first direction and a plurality of blades 152 installed on the fixed shaft 151. The plurality of blades 152 are arranged at intervals along the axial and circumferential directions of the fixed shaft 151. Thus, the plurality of blades 152 can preferably block the melt.

[0051] Furthermore, as Figures 1 - 5 shown, the size of each blade 152 in the radial direction of the fixed shaft 151 is greater than the width of the first gas channel 11. In this way, when thermal runaway occurs inside the battery housing, the blades 152 can also preferably block the movement of the melt towards the first gas channel 11. In this way, the melt is not likely to block the first gas channel 11, and the high-temperature and high-pressure gas can smoothly discharge from the first gas channel 11.

[0052] In some embodiments of the present utility model, as Figures 1 - 5 shown, the valve body 1 has a second groove with an opening facing the cover body 2. The first gas passage 11 penetrates through the bottom wall of the second groove. At least a part of the cover body 2 is located within the second groove. The outlet of the third gas passage 23 faces the side wall of the second groove. Thus, the gas inside the battery housing will pass through a curved passage when flowing towards the third gas passage 23. In this way, when the gas passes through this curved passage, it can adhere well to the side wall of the passage, and can better block the water vapor in the gas.

[0053] In some embodiments of the present utility model, as Figures 1 - 5 shown, a first seal 5 is provided between the valve body 1 and the cover body 2. The first seal 5 is used to seal the gap between the valve body 1 and the cover body 2. Thus, the sealing performance of the first gas passage 11 can be better ensured.

[0054] Exemplarily, as Figures 1 - 5 shown, a second seal 6 is further provided between the valve body 1 and the battery housing. The second seal 6 can seal the gap between the valve body 1 and the battery housing. Thus, the sealing performance of the battery housing can be better ensured.

[0055] Other components and operations of the moisture-blocking and explosion-proof valve 100 of the battery pack according to the embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0056] In the description of this specification, the description with reference to terms such as "some embodiments", "optionally", "further", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A moisture-proof explosion-proof valve for a battery pack, characterized in that: include: a valve body, the valve body being detachably mounted on the battery housing, the valve body having a first gas passage communicating with the battery housing; a cover body, the cover body being movably mounted on the valve body and used for opening or closing the first gas channel, wherein the cover body has an installation space, a second gas channel and a third gas channel, one end of the second gas channel is communicated with the battery housing, the other end of the second gas channel is communicated with the installation space, and the third gas channel is communicated between the installation space and the external space; A water absorbing member and a breathable membrane, wherein the water absorbing member is installed in the installation space, and the breathable membrane is installed on the cover body to close the second gas channel.

2. The battery pack moisture-proof explosion-proof valve according to claim 1, characterized in that: The cover body comprises: A support member, wherein the support member has a first groove, an opening of the first groove faces away from the battery housing, a bottom wall of the first groove is provided with a hollow first column, and the second gas channel includes a first sub-channel located in the first column; A valve cover is installed at the opening of the support member to form the installation space between the valve cover and the support member, and the first column and the valve cover are spaced apart to allow the installation space to communicate with the second gas channel.

3. The moisture-proof explosion-proof valve for battery pack according to claim 2, characterized in that: The support member is provided with the third gas channel, which extends in a direction parallel to the bottom wall of the first groove, and in the depth direction of the first groove, the inlet of the third gas channel is adjacent to the bottom wall of the first groove.

4. The battery pack moisture-proof explosion-proof valve according to claim 2, characterized in that: The water absorbing member is in a ring shape surrounding the outer circumference of the first column.

5. The moisture-proof explosion-proof valve for battery pack according to claim 2, characterized in that: The valve body includes an inner ring valve body and an outer ring valve body connected to each other, the first gas channel is constructed between the inner ring valve body and the outer ring valve body, the inner ring valve body has an installation channel, the support member has a second column installed in the installation channel, the first column and the second column are coaxially arranged, the second gas channel includes a second sub-channel located in the second column, and the first sub-channel and the second sub-channel are connected.

6. The moisture-proof explosion-proof valve for battery pack according to claim 5, characterized in that: The valve body further comprises a sleeve mounted on the outer peripheral side of the inner ring valve body, and the end of the sleeve away from the cover body has an air inlet. The cover body also includes a movable column connected to the second column, an elastic member is arranged between the movable column and the inner ring valve body, the elastic member is used to keep the cover body in a closed state of closing the first gas channel, and the second gas channel includes a third sub-channel located in the movable column.

7. The moisture-proof explosion-proof valve for a battery pack according to claim 6, characterized in that: The valve body further comprises a blocking member, which is mounted at the air inlet of the sleeve and is used for blocking part of the air inlet.

8. The moisture-proof explosion-proof valve for a battery pack according to claim 7, characterized in that: The blocking member includes a fixed shaft extending along a first direction and a plurality of blades mounted on the fixed shaft, wherein the plurality of blades are arranged at intervals along the axial and circumferential directions of the fixed shaft, and a radial dimension of each blade of the fixed shaft is greater than a width of the first gas channel.

9. The moisture-proof explosion-proof valve for battery pack according to claim 1, characterized in that: The valve body has a second groove opening toward the cover body, the first gas channel runs through the bottom wall of the second groove, at least part of the cover body is located in the second groove, and the outlet of the third gas channel is opposite to the side wall of the second groove.

10. The moisture-proof explosion-proof valve for battery pack according to claim 1, characterized in that: A first sealing member is disposed between the valve body and the cover body, and the first sealing member is used to seal a gap between the valve body and the cover body.

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