Explosion-proof valve and battery box

Abstract

An explosion-proof valve and a battery box, a guide block, a waterproof breathable membrane and a pipeline. A pressure relief hole is provided in the guide block, a partition net with a plurality of through holes is provided on the inner wall of the pressure relief hole, the waterproof breathable membrane is provided on one side of the partition net, part of the pipeline is accommodated in the pressure relief hole, and the pipeline and the other side of the partition net are arranged facing each other. By arranging the pipeline on the guide block, when a battery box body has thermal runaway and generates a large amount of gas, the gas can be discharged through the pipeline to realize directional guidance of the gas and prevent the gas, especially the toxic gas, from spreading in the room where the battery box body is located.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy power batteries, and in particular to an explosion-proof valve and a battery box. Background Art

[0002] New energy power batteries have been widely used in new energy vehicles, large-scale energy storage, and electric ships. To ensure the safe operation of the power battery system and prevent the battery pack in the battery pack or the components in the electrical control box from being affected by water, dust, etc., most battery boxes or battery cabinets have a waterproof and dustproof level of IP67 or even IP68, thereby ensuring that the power battery system can be used normally in various environments.

[0003] Waterproof and dustproof means that the interior of the battery box is a sealed environment. Under normal conditions, the electronic devices in the box will generate heat, causing the air in the box to expand due to rising temperature. If the pressure cannot be relieved in time, the box will deform when the pressure is too high, resulting in a decrease in its waterproof and dustproof level and damage to the internal electronic and electrical components. When the battery box accidentally causes thermal runaway, a large amount of heat will be released inside the battery cell. High temperature and high pressure will form inside the battery box in a short period of time, which can easily cause an explosion. Therefore, an explosion-proof valve needs to be installed for prevention to ensure the safety of personnel and reduce property losses.

[0004] However, the explosion-proof valves currently on the market have the following problems. When the battery box thermally runs away and the valve leaks, the toxic gas generated in the battery box will directly overflow into the external environment. For example, in large buses, large energy storage container systems, large cruise ships and other usage environments, there are relatively closed spaces. When the valve leaks, the gas overflowed from the battery box will quickly diffuse into the entire space, which will not only threaten personal safety, but also delay the best time for fire fighting after the battery box thermal runaway. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an explosion-proof valve and a battery box, which can guide the gas in a direction when the valve is released to avoid non-directional dispersion of the gas.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] An explosion-proof valve, comprising:

[0008] A guide block, wherein a pressure relief hole is provided in the guide block, and a partition net with a plurality of through holes is provided on the inner side wall of the pressure relief hole;

[0009] A waterproof and breathable membrane, the waterproof and breathable membrane being arranged on one side of the partition net; and

[0010] A pipeline, part of which is accommodated in the pressure relief hole, and the pipeline is arranged to face the other side of the partition net.

[0011] In one embodiment, the partition net separates the pressure relief hole into a gas discharge portion and a gas discharge portion, the waterproof breathable membrane is located in the gas discharge portion, and a portion of the pipeline is located in the gas discharge portion.

[0012] In one of the embodiments, the explosion-proof valve further includes a fastening ring, which is connected to the inner side wall of the air discharge portion, and the fastening ring is used to clamp the waterproof breathable membrane together with the partition net.

[0013] In one embodiment, the fastening ring includes an outer ring and three cross bars, the outer side wall of the outer ring is connected to the inner side wall of the air leakage part, one ends of the three cross bars are connected to each other, the other ends of the three cross bars are respectively connected to the inner side wall of the outer ring, and the three cross bars are respectively abutted against the waterproof breathable membrane.

[0014] In one of the embodiments, the explosion-proof valve further comprises a sealing ring, which is disposed on an end of the air leakage portion away from the partition net, and the sealing ring is connected to the outer ring.

[0015] In one of the embodiments, a fixing step is provided on the outer side wall of the guide block, and a plurality of fixing holes are opened on the fixing step.

[0016] In one of the embodiments, the explosion-proof valve further includes a plurality of locking members, each of the locking members is correspondingly disposed in each of the fixing holes, and each of the locking members is connected to the box body respectively.

[0017] In one of the embodiments, a positioning step is provided on the inner side wall of the exhaust portion, and the pipe abuts against the positioning step.

[0018] In one of the embodiments, the through holes on the partition net are honeycomb holes.

[0019] A battery box comprises any one of the explosion-proof valves described above.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] The explosion-proof valve and battery box of the present invention include a guide block, a waterproof breathable membrane and a pipe. A pressure relief hole is provided in the guide block. A partition net with a plurality of through holes is provided on the inner wall of the pressure relief hole. The waterproof breathable membrane is provided on one side of the partition net. Part of the pipe is accommodated in the pressure relief hole, and the pipe and the other side of the partition net are arranged facing each other. By providing the pipe on the guide block, when the battery box undergoes thermal runaway and generates a large amount of gas, the gas can be discharged through the pipe to achieve directional guidance of the gas and prevent the gas, especially toxic gas, from spreading in the room where the battery box is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic structural diagram of an explosion-proof valve according to one embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of a guide block according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of the guide block shown;

[0026] Figure 4 It is a schematic structural diagram of a fastening ring according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] It should be noted that the expressions used herein regarding an element being “connected” to another element also mean that an element is “communicated” to another element, and fluids can be exchanged and communicated between the two elements.

[0031] See also Figure 1 and Figure 2 An explosion-proof valve 10 includes a guide block 100, a waterproof breathable membrane 200 and a pipe 300. A pressure relief hole 110 is opened in the guide block 100. A partition net 120 with a plurality of through holes 121 is arranged on the inner side wall of the pressure relief hole 110. The waterproof breathable membrane 200 is arranged on one side surface of the partition net 120. A part of the pipe 300 is accommodated in the pressure relief hole 110, and the pipe 300 and the other side surface of the partition net 120 are arranged facing each other.

[0032] It should be noted that a pressure relief hole 110 is provided in the guide block 100, and then a partition net 120 is provided on the inner side wall of the pressure relief hole 110, and a plurality of through holes 121 are provided on the partition net 120. It should be noted that the partition net 120 and the guide block 100 are an integrally formed structure; further, a waterproof breathable membrane 200 is attached to one side surface of the partition net 120. It should be noted that the waterproof breathable membrane 200 is a thin film that can isolate moisture but allow gas to pass through. In this way, gas can freely pass through the waterproof breathable membrane 200, while moisture is blocked. In this way, when When the explosion-proof valve 10 is installed on the battery case, it can allow gas to enter and exit freely, but can effectively isolate moisture from entering the case to prevent corrosion of devices in the case; further, one end of the pipe 300 is accommodated in the pressure relief hole 110, and the other end of the pipe 300 can extend to the gas containing box outside the battery case. In this way, when thermal runaway occurs in the battery case to which the explosion-proof valve 10 of the present application is applied and a large amount of gas is generated, the gas can be discharged through the pipe 300 to achieve directional guidance of the gas and prevent the gas, especially toxic gas, from spreading in the room where the battery case is located.

[0033] Furthermore, since the explosion-proof valve 10 is provided with a pipe 300, when the battery has thermal runaway and is vented, in order to speed up the cooling of the battery and avoid the risk of secondary thermal runaway of the battery, the battery box can also be provided with a liquid injection type fire extinguishing device connection. When the explosion-proof valve 10 completes the venting, the liquid fire extinguishing medium can be injected into the battery box through the liquid injection device to completely eliminate the hidden dangers of thermal diffusion or even explosion of the battery pack due to secondary thermal runaway of the battery; finally, the liquid fire extinguishing medium can be discharged from the battery box through the pipe 300 to achieve the purpose of effective diversion and cooling.

[0034] See also Figure 3 In one embodiment, the partition net 120 separates the pressure relief hole 110 into a gas relief portion 111 and an exhaust portion 112 , the waterproof breathable membrane 200 is located in the gas relief portion 111 , and part of the pipe 300 is located in the exhaust portion 112 .

[0035] It should be noted that, further, the partition net 120 can separate the pressure relief hole 110 into two parts, namely the air leakage part 111 and the exhaust part 112. The air leakage part 111, the through hole 121 and the exhaust part 112 are connected in sequence. In this way, the gas can flow through the air leakage part 111, the through hole 121 and the exhaust part 112 in sequence, or flow in the opposite direction, and the waterproof breathable membrane 200 is located in the air leakage part 111, and part of the pipe 300 is located in the exhaust part 112, for example, one end of the pipe 300 is inserted into the exhaust part 112.

[0036] Please refer again Figure 1 In one embodiment, the explosion-proof valve 10 further includes a fastening ring 400 , which is connected to the inner wall of the air discharge portion 111 , and the fastening ring 400 is used to clamp the waterproof breathable membrane 200 together with the partition net 120 .

[0037] It should be noted that in order to improve the stability of the waterproof breathable membrane 200, for example, a fastening ring 400 is used to push up the waterproof breathable membrane 200. Specifically, the fastening ring 400 is accommodated in the air leakage portion 111, and the outer wall of the fastening ring 400 is fitted and connected to the inner wall of the air leakage portion 111, and the fastening ring 400 supports one side surface of the waterproof breathable membrane 200 so that the waterproof breathable membrane 200 is tightly fitted with the partition net 120. In this way, the stability of the waterproof breathable membrane 200 can be improved.

[0038] See also Figure 4 In one embodiment, the fastening ring 400 includes an outer ring 410 and three cross bars 420, the outer wall of the outer ring 410 is connected to the inner wall of the air leakage portion 111, one ends of the three cross bars 420 are connected to each other, and the other ends of the three cross bars 420 are respectively connected to the inner wall of the outer ring 410, and the three cross bars 420 are respectively in contact with the waterproof breathable membrane 200.

[0039] It should be noted that three cross bars 420 are connected to the inner wall of the outer ring 410, so that the three cross bars 420 will divide the inner circle area of ​​the outer ring 410 into three parts. These three parts can allow gas to flow through, and the three interconnected cross bars 420 are used to support the waterproof breathable membrane 200, which can effectively prevent the waterproof breathable membrane 200 from detaching from the partition net 120; in one embodiment, in order to improve the structural strength of the connection position of the three cross bars 420, for example, a reinforcement block 430 is provided at the connection position of the three cross bars 420, and each cross bar 420 is respectively connected to the reinforcement block 430, so that the structural strength of the three cross bars 420 is improved by using the reinforcement block 430.

[0040] Please refer again Figure 1 In one embodiment, the explosion-proof valve 10 further includes a sealing ring 500 , which is disposed on an end of the air leakage portion 111 away from the partition net 120 , and the sealing ring 500 is connected to the outer ring 410 .

[0041] It should be noted that the sealing ring 500 is installed at the opening position of the air discharge portion 111, which is on the port away from the partition 120, and the central axis of the sealing ring 500 will also coincide with the central axis of the outer ring 410. In this way, when the explosion-proof valve 10 is in use, the sealing ring 500 will also abut against the wall of the battery box, so that it can be ensured that the gas in the battery box can only enter and exit through the air discharge portion 111, effectively ensuring the air tightness of the side of the explosion-proof valve 10; in one embodiment, in order to improve the air tightness of the sealing ring 500, in a natural state, the highest point of the sealing ring 500 will be higher than the cross-section of the guide block 100, so that when in use, the elasticity of the sealing ring 500 can be used to press on the wall of the battery box to improve the air tightness of the explosion-proof valve 10; in one embodiment, the pressure relief hole 110 is a circular hole, so the air discharge portion 111 and the exhaust portion 112 are both circular grooves, and further, the sealing ring 500 is also a circular sealing ring.

[0042] Please refer again Figure 1 and Figure 2 In one embodiment, a fixing step 130 is provided on the outer wall of the guide block 100 , and a plurality of fixing holes 131 are opened on the fixing step 130 .

[0043] It should be noted that a fixing step 130 is provided on the outer wall of the guide block 100, so that the lateral area of ​​the guide block 100 can be increased. In this way, when the explosion-proof valve 10 is installed on the battery case, the contact area between the explosion-proof valve 10 and the battery case can be increased, thereby improving the stability of the explosion-proof valve 10. Furthermore, a plurality of fixing holes 131 are opened on the fixing step 130, so that the fixing bolts can be passed through the fixing holes 131 to fix the explosion-proof valve 10 on the battery case.

[0044] In one embodiment, the cross section of the fixing step 130 is triangular. It should be noted that setting the fixing step 130 in a triangular shape can improve the stability of the explosion-proof valve 10 on the one hand, and can take into account the size of the explosion-proof valve 10 on the other hand, so that the explosion-proof valve 10 does not occupy too much space on the battery box.

[0045] Please refer again Figure 1 In one embodiment, the explosion-proof valve 10 further includes a plurality of locking members 600, each locking member 600 is correspondingly disposed in each fixing hole 131, and each locking member 600 is connected to the box body respectively.

[0046] It should be noted that, for example, the locking member 600 can be a screw, bolt or other threaded fixing member, which is passed through the fixing hole 131 and then threadedly connected to the battery case. Furthermore, the locking member 600 can also be a rivet, which is passed through the fixing hole 131 and then riveted to the battery case. Therefore, the locking member 600 can be any locking member that plays a fixing role. In this way, the explosion-proof valve 10 can be fixedly installed on the battery case using the locking member 600.

[0047] Please refer again Figure 2 In one embodiment, a positioning step 140 is provided on the inner side wall of the exhaust portion 112 , and the pipe 300 abuts against the positioning step 140 .

[0048] It should be noted that a positioning step 140 is provided on the inner wall of the exhaust portion 112. When the pipe 300 is inserted into the exhaust portion 112, the cross section of the pipe 300 will abut against the positioning step 140. In this way, it can be ensured that the pipe 300 and the exhaust portion 112 are reliably fitted to improve the sealing performance. In one embodiment, the inner diameter of the positioning step 140 is smaller than the inner diameter of the pipe 300. In this way, when thermal runaway occurs in the battery box and a large amount of toxic gas is generated, when the toxic gas flows to the junction of the positioning step 140 and the pipe 300, since the inner diameter of the positioning step 140 is smaller than the inner diameter of the pipe 300, the toxic gas will enter the large flow channel from the small flow channel. In this way, the flow rate of the toxic gas will decrease, thereby effectively preventing the toxic gas from overflowing from between the pipe 300 and the inner wall of the exhaust portion 112, further improving the sealing airtightness.

[0049] Please refer again Figure 2 and Figure 3 In one embodiment, the through holes 121 on the partition 120 are honeycomb holes.

[0050] It should be noted that the through holes 121 on the partition 120 are set as honeycomb holes. In this way, when thermal runaway occurs in the battery box with the explosion-proof valve 10 of the present application installed and a large amount of toxic gas is generated, the toxic gas is depressurized through the explosion-proof valve 10. Since the air pressure generated during thermal runaway is relatively large, when the toxic gas passes through the honeycomb holes, it can be limited to a certain extent by the honeycomb holes, thereby reducing the impact force of the toxic gas. In this way, when the thermal runaway in the battery box is effectively controlled, the explosion-proof valve 10 can also be reused; further, when the thermal runaway in the battery box is further increased, it means that more gas will be generated and the air pressure in the battery box will be greater. In this way, when the air pressure is greater than a certain threshold, the strong impact force of the toxic gas can break open the partition 120. Therefore, setting the through holes 121 on the partition 120 as honeycomb holes can facilitate the gas to break open the partition 120, so that when the thermal runaway situation is serious, the pressure relief efficiency can be improved, and the battery box can be effectively prevented from exploding, thereby improving safety.

[0051] In one embodiment, a battery box includes any of the above explosion-proof valves 10. For example, a vent hole is provided in the body of the battery box, and then the explosion-proof valve 10 is installed on the vent hole, so that the gas in the battery box can enter and exit through the explosion-proof valve 10; further, in order to better fix the explosion-proof valve 10 to the battery box, it can be fixed by welding, which can improve the firmness between the explosion-proof valve 10 and the battery box; it can also be fixed by a locking member 600, for example, after the locking member 600 passes through the body of the battery box, a nut is screwed on the other end of the locking member 600, so that the explosion-proof valve 10 is fixed to the battery box by using the nut and the locking member 600. On the box body, on the one hand, it is convenient to repair and replace the explosion-proof valve 10, and on the other hand, it can improve the flexibility of battery box assembly. In this way, the battery box equipped with the explosion-proof valve 10 of the present application can guide the gas in a direction when thermal runaway occurs, so as to prevent the gas, especially the toxic gas, from spreading in the room where the battery box is located; moreover, when serious thermal runaway occurs, the liquid fire extinguishing medium can be injected through the provided injection device, thereby effectively eliminating the hidden danger of explosion of the battery box. At the same time, the liquid fire extinguishing medium can be discharged from the battery box through the pipeline 300, so as to achieve the purpose of effective diversion and cooling.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An explosion-proof valve, characterized in that: include: A guide block, wherein a pressure relief hole is provided in the guide block, and a partition net with a plurality of through holes is provided on the inner side wall of the pressure relief hole; A waterproof and breathable membrane, wherein the waterproof and breathable membrane is arranged on one side of the partition net; A pipe, part of which is accommodated in the pressure relief hole, and the pipe is arranged to face the other side of the partition; The partition net separates the pressure relief hole into a gas discharge portion and a gas discharge portion, the waterproof breathable membrane is located in the gas discharge portion, and part of the pipeline is located in the gas discharge portion; A fastening ring, the fastening ring is connected to the inner side wall of the air-deflating part, and the fastening ring is used to clamp the waterproof breathable membrane together with the partition net; the fastening ring includes an outer ring and a cross bar, the outer side wall of the outer ring is connected to the inner side wall of the air-deflating part, the cross bar is connected to the inner side wall of the outer ring, and the cross bar abuts against the waterproof breathable membrane; A sealing ring, the sealing ring is arranged on one end of the air leakage part away from the partition net, and the sealing ring is connected to the outer ring; the sealing ring is installed at the opening position of the air leakage part, and the central axis of the sealing ring coincides with the central axis of the outer ring, and the highest point of the sealing ring is higher than the cross section of the guide block; A fixing step is provided on the outer side wall of the guide block, and a plurality of fixing holes are provided on the fixing step; A plurality of locking members, each of which is correspondingly disposed in each of the fixing holes, and each of the locking members is connected to the box body respectively; A positioning step is provided on the inner side wall of the exhaust portion, and the pipe abuts against the positioning step; The inner diameter of the positioning step is smaller than the inner diameter of the pipe; The through holes on the partition net are honeycomb holes.

2. A battery box, characterized in that: Including the explosion-proof valve as claimed in claim 1.

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