Hydrogen-oxygen combination valve for lead-acid storage battery

Abstract

The utility model provides an oxyhydrogen combination valve for a lead-acid storage battery, which belongs to the technical field of storage batteries and comprises a base, a heat-resistant cushion block is mounted in the base and positioned at the outlet end of a gas channel, and the heat-resistant cushion block is a polytetrafluoroethylene part; the reaction bin and the base are installed at the bottom of the reaction bin, the porous ceramic tube is located in the reaction bin, tube holes of the porous ceramic tube are filled with a catalyst, the catalyst fills the whole tube holes of the porous ceramic tube in the length direction of the porous ceramic tube, and the bottom end of the porous ceramic tube is connected with the heat-resistant cushion block in an abutting mode; the utility model has the beneficial effects that the heat-resistant cushion block is padded between the bottom of the porous ceramic tube and the base, so that the bottom of the porous ceramic tube is prevented from being in direct contact with the base, the defect that the contact area of the base and the bottom of the porous ceramic tube is melted due to high temperature is effectively overcome, and the porous ceramic tube can be filled with a catalyst in the whole length direction; the catalytic efficiency of the hydrogen-oxygen composite reaction is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology and relates to a hydrogen-oxygen composite valve for lead-acid batteries. Background Technology

[0002] Lead-acid batteries are an important secondary chemical power source. During charging, they undergo water electrolysis, where water decomposes into hydrogen and oxygen, leading to a decrease in internal water content and an increase in pressure. When the internal pressure exceeds a set safety value, the gases inside the battery need to be released to alleviate the pressure. During this process, hydrogen and oxygen are released to the atmosphere, which could potentially ignite and create a fire hazard. Simultaneously, the loss of hydrogen and oxygen causes continuous water loss from the electrolyte, shortening the frequency of adding water to adjust the acid level.

[0003] There is currently an invention patent with application number CN200910025683.5 entitled "A Hydrogen-Oxygen Composite Valve for Lead-Acid Batteries". This hydrogen-oxygen composite valve has a porous ceramic tube inside, which is filled with a catalyst that can promote the chemical reaction between hydrogen and oxygen to generate water. The water flows back into the battery electrolyte, thereby greatly reducing the water loss of the electrolyte.

[0004] The reaction between hydrogen and oxygen generates a large amount of heat, keeping the porous ceramic tube at a very high temperature (up to 170 degrees Celsius). The upper and lower ends of the ceramic tube are respectively mounted on two ordinary PP plastic brackets. Because PP material has a low melting point, the plastic brackets are easily melted by the high-temperature ceramic tube, which in turn makes it impossible to fix the ceramic tube in the valve body.

[0005] In the aforementioned hydrogen-oxygen composite valve, in order to solve the problem of the plastic support melting caused by the high-temperature ceramic tube during the reaction, the catalyst is only filled in a part of the ceramic tube (because the main heat-generating area of ​​the ceramic tube is concentrated in the section filled with catalyst), and the two ends of the ceramic tube are not filled with catalyst, so that the two ends of the ceramic tube are hollow. The plastic support is connected to the hollow end of the ceramic tube, thereby avoiding contact between the high-temperature area of ​​the plastic support and the ceramic tube.

[0006] While the above design can prevent the plastic support from melting, the cost is a reduction in the effective filling space of the ceramic tube. The catalyst cannot fill the entire ceramic tube, and in the actual structure, only half the length of the ceramic tube can be effectively used to fill the catalyst (i.e., the amount of catalyst in the ceramic tube is relatively small), resulting in low catalytic efficiency. Utility Model Content

[0007] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a hydrogen-oxygen composite valve for lead-acid batteries.

[0008] The objective of this utility model can be achieved through the following technical solution: a hydrogen-oxygen composite valve for lead-acid batteries, comprising:

[0009] A base, which is hollow and has a gas channel, is equipped with a heat-resistant pad, which is located at the outlet end of the gas channel. The heat-resistant pad is made of polytetrafluoroethylene.

[0010] The reaction chamber is provided with a reaction cavity, the base is installed at the bottom of the reaction chamber and the base seals the opening of the reaction cavity, and the gas passage is connected to the reaction cavity;

[0011] A porous ceramic tube is located inside the reaction chamber. The pores of the porous ceramic tube are filled with a catalyst, and the catalyst fills the entire pore of the porous ceramic tube along its length. The bottom end of the porous ceramic tube is in contact with the heat-resistant pad.

[0012] Preferably, the inner wall of the base has a plurality of first limiting portions located in the gas channel, each of the first limiting portions being arranged in a ring along the circumference of the gas channel, the heat-resistant pad being located between each of the first limiting portions, and the bottom of the porous ceramic tube being located between each of the first limiting portions.

[0013] Preferably, the inner wall of the reaction chamber has a plurality of second limiting portions located in the reaction chamber, each of the second limiting portions being arranged in a ring along the circumference of the reaction chamber, and the porous ceramic tube being located between each of the second limiting portions.

[0014] Preferably, the top end of the porous ceramic tube is in contact with the inner top wall of the reaction chamber.

[0015] Preferably, each of the first limiting portions has a support portion, the support portion being integrally connected to each of the first limiting portions, and the heat-resistant pad is mounted on the support portion.

[0016] Preferably, both the base and the reaction chamber are made of polyphenylene ether plastic.

[0017] Preferably, a sealing ring is provided at the connection between the base and the reaction chamber.

[0018] Preferably, the outer wall of the base is provided with at least one air outlet port, the interior of the air outlet port is connected to the gas channel, and the air outlet port is sealed with a first filter plate and a second filter plate.

[0019] Preferably, the first and second filter plates are arranged sequentially along the outlet direction of the outlet port. Both the first and second filter plates are provided with ventilation micropores. The pore size of the ventilation micropores of the second filter plate is smaller than that of the ventilation micropores of the first filter plate. The first filter plate is configured to allow gas to pass through, and the second filter plate is configured to allow gas to pass through when the pressure difference between the inside and outside of the reaction chamber reaches a set threshold and to prevent gas from passing through when the pressure difference between the inside and outside of the reaction chamber is less than the set threshold.

[0020] Preferably, a labyrinth component is provided in the gas channel. The labyrinth component is configured as a cone-shaped structure. A gap is reserved between the peripheral wall of the labyrinth component and the inner wall of the base. A through hole is provided in the peripheral wall of the labyrinth component.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. A heat-resistant pad is placed between the bottom of the porous ceramic tube and the base to prevent the bottom of the porous ceramic tube from directly contacting the base. This effectively solves the problem of the base melting at high temperatures in the contact area with the bottom of the porous ceramic tube, allowing the porous ceramic tube to be filled with catalyst along its entire length, thus ensuring the catalytic efficiency of the hydrogen-oxygen complex reaction.

[0023] 2. Both the base and the reaction chamber are made of polyphenylene oxide (PPO) plastic. PPO has the advantage of high temperature resistance; it can withstand temperatures up to 150°C for extended periods and has a short-term heat resistance peak of 170°C. During the exothermic hydrogen-oxygen composite reaction, the temperature at the bottom of the porous ceramic tube reaches approximately 170°C. While ordinary plastics (such as ABS and nylon) may soften, PPO can operate stably, preventing the base and reaction chamber from melting.

[0024] 3. When the pressure in the gas channel reaches the set threshold, the second filter begins to allow gas to pass through. Under pressure, some high-pressure gas passes through the first and second filter in sequence and is discharged through the outlet port, thereby achieving initial pressure relief, preventing further pressure accumulation, and protecting the battery. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of the hydrogen-oxygen composite valve of this utility model.

[0026] Figure 2 This is a schematic diagram of the base of this utility model.

[0027] Figure 3 This is an exploded view of the hydrogen-oxygen composite valve of this utility model.

[0028] Figure 4 This is an isometric view of the hydrogen-oxygen composite valve of this utility model.

[0029] In the diagram, 100 is the base; 110 is the gas channel; 120 is the heat-resistant pad; 130 is the first limiting part; 140 is the support part; 150 is the gas outlet port; 151 is the first filter; 152 is the second filter; 160 is the labyrinth component; 161 is the through hole; 200 is the reaction chamber; 210 is the reaction cavity; 220 is the second limiting part; 300 is the porous ceramic tube; 310 is the catalyst; 400 is the sealing ring; and 500 is the locking ring. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figures 1 to 4 As shown, a hydrogen-oxygen recombinant valve for lead-acid batteries includes:

[0032] The base 100 is hollow and has a gas channel 110. A heat-resistant pad 120 is installed inside the base 100 and is located at the outlet end of the gas channel 110. The heat-resistant pad 120 is made of polytetrafluoroethylene.

[0033] The reaction chamber 200 is provided with a reaction cavity 210. The base 100 is installed at the bottom of the reaction chamber 200 and seals the opening of the reaction cavity 210. The gas passage 110 is connected to the reaction cavity 210.

[0034] A porous ceramic tube 300 is located inside the reaction chamber 200. The porous ceramic tube 300 is filled with catalyst 310, and the catalyst 310 fills the entire pore of the porous ceramic tube 300 along its length. The bottom end of the porous ceramic tube 300 is in contact with the heat-resistant pad 120.

[0035] The gas channel 110 is used to guide the hydrogen-oxygen mixture generated inside the battery into the reaction chamber 200. The heat-resistant pad 120 mainly serves to insulate and support the porous ceramic tube 300, preventing the bottom of the porous ceramic tube 300 from directly contacting the base 100. Since the heat-resistant pad 120 is made of polytetrafluoroethylene (PTFE), and due to its material properties, it can withstand a maximum temperature of 260 degrees Celsius without deformation or damage. The maximum temperature of the porous ceramic tube 300 is only 170 degrees Celsius, so the heat-resistant pad 120 will not be melted by the porous ceramic tube 300.

[0036] The reaction chamber 200 is used to provide a sealed reaction chamber 210. The reaction chamber 200 is connected to the inside of the battery through the gas channel 110, so the gas inside the battery can enter the reaction chamber 200, thereby putting the reaction chamber 200 in a high-pressure environment. This forces hydrogen atoms and oxygen atoms to come into contact with the catalyst 310 through the wall of the porous ceramic tube 300, thereby ensuring that the hydrogen-oxygen recombination reaction can continue.

[0037] In this example, the reaction chamber 200 resembles a conical structure, with a locking ring 500 fitted around its outer periphery. The locking ring 500 can slide along the axial direction of the reaction chamber 200, and it is interference-fitted with the bottom of the reaction chamber 200. When the reaction chamber 200 is connected to the base 100, the locking ring 500 is pushed towards the bottom of the reaction chamber 200 (the connection point between the reaction chamber 200 and the base 100). The locking ring 500 radially compresses the bottom peripheral wall of the reaction chamber 200, thereby tightening the bottom of the reaction chamber 200 around the base 100, ultimately achieving a locking and fixing of the reaction chamber 200 and the base 100.

[0038] The catalyst 310 inside the porous ceramic tube 300 promotes the recombination reaction of hydrogen and oxygen, converting them into water and reducing the internal pressure of the battery. The porous ceramic tube 300 has a large number of uniformly distributed micropores on its wall, which promote gas permeation and ensure that hydrogen and oxygen atoms can penetrate the tube wall and contact the catalyst 310. The recombination reaction of hydrogen and oxygen atoms produces water, thereby reducing the pressure inside the battery and the recombination valve, preventing battery expansion or explosion. Furthermore, the water generated during the reaction flows back into the battery, reducing water loss from the electrolyte. Because the bottom of the porous ceramic tube 300 is lined with a heat-insulating pad, eliminating the risk of melting, the end of the porous ceramic tube 300 does not need to be designed as a hollow structure. Filling the entire porous ceramic tube 300 with catalyst 310 greatly increases the dosage of catalyst 310, thereby significantly improving the efficiency of the hydrogen-oxygen recombination reaction.

[0039] The working principle of this hydrogen-oxygen recombination valve is as follows: During the charging process of a lead-acid battery, hydrogen and oxygen are generated inside the battery. Since the reaction chamber 210 is connected to the inside of the battery through the gas channel 110, these hydrogen and oxygen gases enter the reaction chamber 210. Under the high pressure inside the reaction chamber 210, they permeate the wall of the porous ceramic tube 300 and come into contact with the catalyst 310, causing the hydrogen and oxygen to react chemically and generate water vapor. The water vapor condenses into water droplets on the inner wall of the reaction chamber 200 and flows back into the battery. During the hydrogen-oxygen recombination reaction, in addition to generating water vapor, a large amount of heat is also generated. The porous ceramic tube 300 absorbs a large amount of heat and thus remains at a high temperature, thereby promoting the occurrence of the hydrogen-oxygen recombination reaction (because high temperature can accelerate the rate of the hydrogen-oxygen recombination reaction). Through the recombination reaction, the accumulation of gas inside the battery is reduced, the internal pressure is maintained, and the battery casing is prevented from expanding or exploding.

[0040] The hydrogen-oxygen recombination reaction is an exothermic process. The bottom of the porous ceramic tube 300 (the bottom surface of the catalyst 310) has a high temperature. If it directly contacts the base 100 over a large area, the base 100 may soften, deform, or even melt due to the high temperature, leading to structural failure and thus failing to support the porous ceramic tube 300. The heat-resistant pad 120 acts as a heat insulation barrier, utilizing the high-temperature resistance of polytetrafluoroethylene (PTFE) to block heat transfer to the base 100. This prevents the bottom of the porous ceramic tube 300 (the bottom surface of the catalyst 310) from directly contacting the base 100 over a large area, protecting the base 100 from high-temperature damage.

[0041] Because the heat insulation pad solves the drawback of direct large-area contact between the base 100 and the bottom of the porous ceramic tube 300, the porous ceramic tube 300 can be filled with catalyst 310 along its entire length, ensuring the catalytic efficiency of the hydrogen-oxygen recombination reaction. Even if the end of the porous ceramic tube 300 generates high temperature due to the filling of catalyst 310, the base 100 will not be damaged due to high temperature. That is, this design, by designing the heat insulation pad, allows the end of the porous ceramic tube 300 to also be filled with catalyst 310, instead of designing it as a hollow end as in the prior art.

[0042] Preferably, the heat insulation pad is designed with a microporous structure, which allows hydrogen and oxygen to permeate the heat insulation pad and come into contact with the catalyst 310.

[0043] like Figure 1 , Figure 2 As shown, based on the above embodiment, the inner wall surface of the base 100 has a plurality of first limiting portions 130 located in the gas channel 110. Each first limiting portion 130 is arranged in a ring along the circumference of the gas channel 110. The heat-resistant pad 120 is located between each first limiting portion 130, and the bottom of the porous ceramic tube 300 is located between each first limiting portion 130.

[0044] The first limiting part 130 is configured as a radial protrusion or rib, and the radial displacement of the bottom of the porous ceramic tube 300 is restricted by the annular arrangement of the first limiting parts 130. In the actual structure, each of the first limiting parts 130 is in contact with the tube wall at the bottom of the porous ceramic tube 300, so that the bottom of the porous ceramic tube 300 is embedded between the first limiting parts 130 to restrict the radial degree of freedom of the porous ceramic tube 300, thereby locking the porous ceramic tube 300. The heat-resistant pad 120 is placed on the bottom end of the porous ceramic tube 300, so that the bottom of the porous ceramic tube 300 is mounted on the base 100. Since the first limiting parts 130 only contact a small area of ​​the outer wall surface of the porous ceramic tube 300, they are not easily affected by high temperature.

[0045] Based on the above embodiments, the inner wall surface of the reaction chamber 200 has a plurality of second limiting portions 220 located in the reaction chamber 210. Each second limiting portion 220 is arranged in a ring along the circumference of the reaction chamber 210, and the porous ceramic tube 300 is located between each second limiting portion 220.

[0046] The second limiting part 220 is arranged in a ring around the reaction chamber 210 and contacts the outer wall of the porous ceramic tube 300, restricting the axial displacement of the porous ceramic tube 300. The second limiting part 220 cooperates with the first limiting part 130 to limit the upper and lower ends of the porous ceramic tube 300. Under the joint constraint of the two, the porous ceramic tube 300 is completely fixed in the reaction chamber 210. In addition, since the second limiting part 220 has a small contact area with the outer wall of the porous ceramic tube 300, it is not easily affected by high temperature.

[0047] Based on the above embodiment, the top end of the porous ceramic tube 300 is in contact with the inner top wall of the reaction chamber 200. The inner top wall of the reaction chamber 200 and the heat insulation pad are respectively in contact with the top and bottom ends of the porous ceramic tube 300, forming an axial limit, so that the porous ceramic tube 300 cannot move axially.

[0048] Based on the above embodiment, each of the first limiting portions 130 has a support portion 140, which is integrally connected to each of the first limiting portions 130, and the heat-resistant pad 120 is mounted on the support portion 140. The support portion 140 is used to support the heat-resistant pad 120.

[0049] Based on the above embodiments, both the base 100 and the reaction chamber 200 are made of polyphenylene oxide (PPO) plastic. Polyphenylene oxide (PPO) has the advantage of high temperature resistance; it can withstand high temperatures of 150°C for extended periods and has a short-term heat resistance peak of 170°C.

[0050] When the hydrogen-oxygen complex reaction is exothermic, the bottom temperature of the porous ceramic tube 300 is about 170°C. Ordinary plastics (such as ABS and nylon) may soften, while PPO can work stably, preventing the base 100 and reaction chamber 200 from melting.

[0051] Based on the above embodiment, a sealing ring 400 is provided at the connection between the base 100 and the reaction chamber 200. The sealing ring 400 at the connection between the base 100 and the reaction chamber 200 is a core component to ensure the system's airtightness. The sealing ring 400 ensures that high-pressure gas will not leak from the connection between the base 100 and the reaction chamber 200.

[0052] like Figures 1 to 4As shown, based on the above embodiment, the outer wall of the base 100 is provided with at least one air outlet port 150. The interior of the air outlet port 150 is connected to the gas channel 110, and the air outlet port 150 is sealed with a first filter plate 151 and a second filter plate 152.

[0053] Based on the above embodiment, the first filter plate 151 and the second filter plate 152 are arranged sequentially along the gas outlet direction of the gas outlet port 150. Both the first filter plate 151 and the second filter plate 152 are provided with ventilation micropores. The pore size of the ventilation micropores of the second filter plate 152 is smaller than the pore size of the ventilation micropores of the first filter plate 151. The first filter plate 151 is configured to allow gas to pass through, and the second filter plate 152 is configured to allow gas to pass through when the pressure difference inside and outside the reaction chamber 210 reaches a set threshold and to prevent gas from passing through when the pressure difference inside and outside the reaction chamber 210 is less than the set threshold.

[0054] The vent port 150 normally functions as a sealed point, achieving zero leakage through dual filters. Under extreme overpressure conditions (such as battery thermal runaway), it forms a full-bore pressure relief channel, rapidly venting the gas inside the battery in a very short time. The first filter 151 blocks large particles while allowing gas to pass through. The second filter 152 acts as a pressure-sensitive valve through the dynamic switching effect of its own venting micropores. When the pressure difference between the inside and outside of the gas channel 110 is less than a threshold (i.e., the battery is at a low pressure level), gas cannot pass through the venting micropores of the second filter 152; while when the pressure difference between the inside and outside of the gas channel 110 is greater than the threshold, under high pressure, gas can pass through the venting micropores of the second filter 152, thus being discharged to the outside.

[0055] The purpose of the vent port 150, the first filter 151, and the second filter 152 is to provide emergency pressure relief when the internal pressure of the battery is too high. When a large amount of gas accumulates inside the battery due to the hydrogen-oxygen gas generation rate exceeding the recombination reaction rate in the reaction chamber 210, it may cause a sharp rise in internal pressure, posing a risk of explosion. The first filter 151 has relatively large pore sizes, primarily used to filter large particulate impurities in the gas, preventing them from clogging the microporous structure of the second filter 152 and ensuring that the second filter 152 can operate stably and reliably.

[0056] When the pressure in the gas channel 110 reaches the set threshold, the second filter 152 begins to allow gas to pass through. Under pressure, some of the high-pressure gas passes through the first filter 151 and the second filter 152 in sequence and is discharged through the outlet port 150, thereby achieving initial pressure relief, preventing further pressure accumulation, and protecting the battery.

[0057] It should be noted that the first filter 151 and the second filter 152 are both fixed to the outlet port 150 by an interference fit. When the internal pressure of the battery continues to rise and reaches a critical value, the high-pressure gas will directly push the two filter plates out of the outlet port 150, allowing all the gas inside the battery casing to be quickly and completely released through the outlet port 150 to cope with the extreme situation where the internal pressure of the battery is about to run out of control, thereby maximizing safety.

[0058] like Figures 1 to 3 As shown, based on the above embodiment, a labyrinth component 160 is provided in the gas channel 110. The labyrinth component 160 is configured as a conical structure. A gap is reserved between the peripheral wall of the labyrinth component 160 and the inner wall of the base 100. A through hole 161 is provided in the peripheral wall of the labyrinth component 160.

[0059] The function of the labyrinth component 160 is to prevent gas from directly impacting the gas channel 110, so that the gas can only enter the gas channel 110 through the through hole 161 on the side wall of the labyrinth component 160, thereby providing a buffer.

[0060] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0061] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A hydrogen-oxygen composite valve for lead-acid batteries, characterized in that, include: A base (100) is hollow and has a gas channel (110). A heat-resistant pad (120) is installed inside the base (100) and the heat-resistant pad (120) is located at the outlet end of the gas channel (110). The heat-resistant pad (120) is made of polytetrafluoroethylene. A reaction chamber (200) is provided with a reaction cavity (210). A base (100) is installed at the bottom of the reaction chamber (200) and the base (100) seals the opening of the reaction cavity (210). A gas channel (110) is connected to the reaction cavity (210). A porous ceramic tube (300) is located inside the reaction chamber (200). The porous ceramic tube (300) is filled with a catalyst (310) in its pores, and the catalyst (310) fills the entire pore of the porous ceramic tube (300) along its length. The bottom end of the porous ceramic tube (300) is in contact with the heat-resistant pad (120).

2. The hydrogen-oxygen composite valve for lead-acid batteries as described in claim 1, characterized in that: The inner wall of the base (100) has a plurality of first limiting portions (130) located in the gas channel (110). Each of the first limiting portions (130) is arranged in a ring along the circumference of the gas channel (110). The heat-resistant pad (120) is located between each of the first limiting portions (130). The bottom of the porous ceramic tube (300) is located between each of the first limiting portions (130).

3. The hydrogen-oxygen composite valve for lead-acid batteries as described in claim 2, characterized in that: The inner wall of the reaction chamber (200) has a plurality of second limiting portions (220) located in the reaction cavity (210). Each of the second limiting portions (220) is arranged in a ring along the circumference of the reaction cavity (210), and the porous ceramic tube (300) is located between each of the second limiting portions (220).

4. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 3, characterized in that: The top end of the porous ceramic tube (300) is in contact with the inner top wall of the reaction chamber (200).

5. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 2, characterized in that: Each of the first limiting portions (130) has a support portion (140), the support portion (140) is integrally connected to each of the first limiting portions (130), and the heat-resistant pad (120) is installed on the support portion (140).

6. A hydrogen-oxygen composite valve for lead-acid batteries as described in any one of claims 1 to 5, characterized in that: Both the base (100) and the reaction chamber (200) are polyphenylene ether plastic parts.

7. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 1, characterized in that: A sealing ring (400) is provided at the connection between the base (100) and the reaction chamber (200).

8. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 1 or 7, characterized in that: The outer wall of the base (100) is provided with at least one air outlet (150), the interior of the air outlet (150) is connected to the gas channel (110), and the air outlet (150) is sealed with a first filter (151) and a second filter (152).

9. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 8, characterized in that: The first filter (151) and the second filter (152) are arranged sequentially along the outlet direction of the outlet port (150). Both the first filter (151) and the second filter (152) are provided with ventilation micropores. The pore size of the ventilation micropore of the second filter (152) is smaller than that of the ventilation micropore of the first filter (151). The first filter (151) is configured to allow gas to pass through, and the second filter (152) is configured to allow gas to pass through when the pressure difference inside and outside the reaction chamber (210) reaches a set threshold and to prevent gas from passing through when the pressure difference inside and outside the reaction chamber (210) is less than the set threshold.

10. A hydrogen-oxygen composite valve for lead-acid batteries as described in claim 1, characterized in that: A labyrinth component (160) is provided inside the gas channel (110). The labyrinth component (160) is configured as a conical structure. A gap is reserved between the peripheral wall of the labyrinth component (160) and the inner wall of the base (100). A through hole (161) is provided on the peripheral wall of the labyrinth component (160).

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