A liquid replenishing device for a liquid rich battery

Abstract

This utility model relates to a electrolyte replenishment device for a flooded battery, comprising a housing and a replenishment unit. The housing has an inlet, an outlet, an air inlet, a centralized exhaust port, a first channel for electrolyte flow, and a second channel for exhaust. The inlet, first channel, and outlet form a replenishment path, while the air inlet, second channel, and centralized exhaust port form an exhaust path. The replenishment path and the exhaust path are independent of each other. The replenishment unit includes a push assembly, a push rod, and a seal that abut against each other in sequence. The push assembly moves the push rod and then the seal based on changes in the electrolyte level. The seal controls the opening and closing of the first channel. By setting two isolated replenishment and exhaust paths, the replenishment device does not interfere with each other in the replenishment and exhaust states, improving the response efficiency and replenishment accuracy of the device. It also enables more timely and accurate automatic switching between full and replenishment states, ensuring that the electrolyte level is always maintained within a suitable range.

Description

Technical Field

[0001] This utility model relates to the field of liquid replenishment devices, and in particular to a liquid replenishment device for flooded batteries. Background Technology

[0002] Flooded lead-acid batteries are widely used in power systems, communication base stations, industrial equipment, and emergency power supplies due to their simple structure, high reliability, and low cost. However, during long-term operation, especially during charging, the water in the electrolyte undergoes an electrolytic reaction, producing hydrogen and oxygen, along with a certain amount of acid mist. This phenomenon not only causes continuous water loss in the electrolyte, leading to electrolyte shortage and affecting battery performance and lifespan, but also requires air agitation during operation to prevent electrolyte stratification. This process carries away some hydrogen and acid mist, further increasing safety and environmental concerns.

[0003] To address these issues, some existing technologies have integrated valve devices that combine water replenishment and venting functions. These devices can be installed on top of flooded batteries to achieve integrated management of liquid level control and gas emission. However, the replenishment and venting paths of these valves overlap significantly. When charging and replenishing the flooded battery need to be performed simultaneously, the liquid may obstruct the normal venting path of the gas, causing hydrogen and acid mist to accumulate in the confined space. Furthermore, some electrolyte may be carried out with the gas during venting. This not only leads to electrolyte loss and increased maintenance costs but may also cause abnormal liquid level fluctuations, affecting battery performance and lifespan. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the defects in the prior art, thereby providing a liquid replenishment device for flooded batteries.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A liquid replenishment device for flooded batteries includes a housing and a liquid replenishment unit.

[0007] The housing includes a liquid inlet, a liquid outlet, an air inlet, a centralized exhaust outlet, a first channel for liquid flow, and a second channel for exhaust. The liquid inlet, the first channel, and the liquid outlet form a liquid replenishment path, and the air inlet, the second channel, and the centralized exhaust outlet form an exhaust path. The liquid replenishment path and the exhaust path are independent of each other.

[0008] The electrolyte replenishment unit includes a pushing component, a push rod, and a sealing element that are sequentially connected. The pushing component is used to drive the push rod and then the sealing element to move by the change in the electrolyte level. The sealing element is used to control the opening and closing of the first channel.

[0009] Furthermore, the housing includes an outer shell and an inner shell;

[0010] The liquid inlet, the air inlet, and the centralized exhaust outlet are located on the outer shell. The outer shell is specifically connected to the outside through a first cavity via the centralized exhaust outlet. The inner shell is located within the first cavity and is spaced apart from the inner wall of the outer shell. The liquid outlet is located on the inner shell. The inner shell has a connecting hole connected to the outside and an axially extending second cavity. The push rod and the sealing element are located within the second cavity. The pushing assembly is located outside the shell. The pushing assembly and the push rod abut against each other through the connecting hole.

[0011] The second cavity located outside the push rod and the seal forms the first channel, and the water inlet of the first channel is connected to the liquid inlet through the seal.

[0012] Furthermore, there is a ventilation gap between the outer wall of the inner shell and the inner wall of the outer shell, which communicates with the air inlet, and the ventilation gap communicates with the first cavity to form the second channel.

[0013] Furthermore, it also includes an acid filter, which is disposed within the first cavity and located downstream of the ventilation gap.

[0014] Furthermore, the pushing assembly includes a cam portion and a float. The cam portion is rotatably connected to the outside of the housing and fixedly connected to the float, so that it rotates relative to the housing through a lever action driven by the float and drives the push rod to move.

[0015] Furthermore, the cam portion includes a cam connecting rod, a rotating shaft, and a connecting seat. The connecting seat is fixedly connected to the outer wall of the bottom of the housing. The bottom end of the cam connecting rod is fixedly connected to the float. The top end of the cam connecting rod abuts against the push rod. The rotating shaft is rotatably connected to the connecting seat so that the cam connecting rod can rotate relative to the connecting seat under the drive of the float, thereby driving the push rod to move.

[0016] Furthermore, the push rod includes a push rod body and a push rod base. The top end of the push rod body is provided with a mounting hole for fitting with the seal. The bottom end of the push rod body is fixedly connected to the top end of the push rod base. The bottom end of the push rod base abuts against the cam portion, so as to drive the push rod body to move under the action of the cam portion.

[0017] Furthermore, the push rod body is cross-shaped and integrally formed.

[0018] Furthermore, the outer casing also includes a top cover and a side wall, the top cover being sealed and fixed to the top of the side wall, the liquid inlet being opened on the top cover, and the centralized exhaust port being opened on the side wall;

[0019] The number of liquid outlets is at least one and is located at the bottom end of the inner shell.

[0020] Furthermore, an indicator rod protrudes from one end of the push rod body that connects to the seal, and the housing has a mounting position corresponding to the indicator rod, the mounting position being made of transparent material.

[0021] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0022] This utility model relates to a electrolyte replenishment device for a flooded battery, comprising a housing and a replenishment unit. The housing has an inlet, an outlet, an air inlet, a central exhaust port, a first channel for electrolyte flow, and a second channel for exhaust. The inlet, first channel, and outlet form a replenishment path, while the air inlet, second channel, and central exhaust port form an exhaust path. The replenishment and exhaust paths are independent of each other, ensuring that the replenished liquid and the discharged gas do not interfere with each other during replenishment and exhaust. The replenishment unit includes a pushing component, a push rod, and a sealing element that abut against each other in sequence. The pushing component moves the push rod and subsequently the sealing element based on changes in the electrolyte level. The sealing element controls the opening and closing of the first channel. By setting two isolated replenishment and exhaust paths, the replenishment device does not interfere with each other during replenishment and exhaust. This avoids obstruction of the exhaust path by the replenishment liquid flow, promptly releasing the increased pressure inside the flooded battery caused by gas generation and maintaining stable internal pressure. Furthermore, it prevents some electrolyte from being carried out with the gas during exhaust, reducing unnecessary electrolyte loss. It can perform electrolyte replenishment and gas venting operations at the same time, thereby improving the response efficiency and replenishment accuracy of the replenishment device. It can also automatically switch between full liquid state and replenishment state more timely and accurately, ensuring that the electrolyte level is always kept within a suitable range and extending the service life of flooded batteries. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an exploded structural diagram of the liquid replenishment device provided in one embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the fluid replenishment device provided in one embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the fluid replenishment device provided in one embodiment of the present invention from another angle.

[0027] Figure 4 for Figure 3 A cross-sectional view of section AA when the liquid level is full.

[0028] Figure 5 for Figure 3 A cross-sectional view of section AA during fluid resuscitation.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Shell; 11. Outer shell; 111. Liquid inlet; 112. Air inlet; 113. Centralized exhaust port; 114. First cavity; 115. Ventilation gap; 116. Top cover; 117. Side wall; 12. Inner shell; 121. Liquid outlet; 122. Connecting hole; 123. Second cavity; 13. Mounting position;

[0031] 2. Liquid replenishment unit; 21. Push assembly; 211. Cam section; 2111. Cam connecting rod; 2112. Rotating shaft; 2113. Connecting seat; 212. Float; 22. Push rod; 221. Push rod body; 2211. Mounting hole; 222. Push rod base; 223. Indicator rod; 23. Seal;

[0032] 3. Acid filter tablets. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] A liquid replenishment device for flooded batteries, as shown in the attached... Figure 1 To be continued Figure 5 As shown, the device includes a housing 1 and a liquid replenishment unit 2. The housing 1 has a liquid inlet 111, a liquid outlet 121, an air inlet 112, a centralized exhaust port 113, a first channel for liquid flow, and a second channel for exhaust. The liquid inlet 111, the first channel, and the liquid outlet 121 form a liquid replenishment path, while the air inlet 112, the second channel, and the centralized exhaust port 113 form an exhaust path. The liquid replenishment path and the exhaust path are independent of each other and are physically isolated to ensure that the replenished electrolyte or water does not interfere with the discharged acid mist or hydrogen gas during liquid replenishment and exhaust. The liquid replenishment unit 2 includes a push assembly 21, a push rod 22, and a seal 23 that abut against each other in sequence. The push assembly 21 is used to drive the push rod 22 and then the seal 23 to move based on the change in the electrolyte level. The seal 23 is used to control the opening and closing of the first channel. The push assembly 21 can be in the form of a float or a combination of different types of liquid level sensors and an actuator such as a motor.

[0037] Specifically, the liquid replenishment device has a full liquid state, a liquid replenishment state, and a venting state.

[0038] As attached Figure 4 As shown, when the electrolyte level in the flooded battery is at the normal level, the push assembly 21 can use buoyancy to drive the push rod 22 to move. Simultaneously, the push rod 22 drives the seal 23 to move towards the inlet 111, causing the seal 23 to block the inlet 111, thus disconnecting the first channel from the inlet 111. External electrolyte or water cannot flow into the first channel through the inlet 111, effectively sealing the replenishment path. At this time, the replenishment device is in a full state. (See attached diagram) Figure 5As shown, when the electrolyte level drops during use due to electrolyte consumption or temperature changes, the push assembly 21 moves the push rod 22 away from the inlet 111, causing the seal 23 to move away from the inlet 111. This connects the first channel to the inlet 111, thus establishing a replenishment path. External electrolyte or water flows into the first channel through the inlet 111 and is finally injected into the battery through the outlet 121. At this time, the replenishment device is in replenishment mode. This cycle repeats, with the push assembly 21 moving the push rod 22 and seal 23 according to the electrolyte level, automatically switching between full and replenishment modes.

[0039] During the operation of a flooded battery, especially during charging, water decomposes to produce hydrogen gas. To prevent electrolyte stratification, air is introduced into the battery to create disturbance, which also carries away some acid mist. (See attached image) Figure 4 and attached Figure 5 As shown, these gases enter and converge through inlet 112, flow along an independent second channel, and are finally discharged through centralized exhaust port 113. Preferably, an external exhaust pipe is connected at centralized exhaust port 113, and the gases are converged through the external exhaust pipe and then connected to the main exhaust pipe to receive acid mist and hydrogen for unified emission treatment.

[0040] Because flooded batteries generate gases such as hydrogen during operation (especially during charging), accompanied by acid mist, and the electrolyte is continuously consumed due to water decomposition or temperature changes, venting and electrolyte replenishment often need to be performed simultaneously. This invention addresses this by setting up two isolated replenishment and venting paths, ensuring that the replenishment and venting processes do not interfere with each other. This avoids obstruction of the venting path by the replenishment fluid flow, promptly releasing the increased pressure inside the flooded battery caused by gas generation and maintaining stable internal pressure. Furthermore, it prevents some electrolyte from being carried out with the gas during venting, reducing unnecessary electrolyte loss. This allows for simultaneous electrolyte replenishment and gas venting, improving the response efficiency and accuracy of the replenishment device. It also enables more timely and accurate automatic switching between full and replenishment states, ensuring the electrolyte level remains within a suitable range and extending the battery's lifespan.

[0041] In some embodiments of this utility model, as shown in the appendix Figure 1 To be continued Figure 5As shown, the housing 1 includes an outer shell 11 and an inner shell 12. A liquid inlet 111, an air inlet 112, and a centralized exhaust outlet 113 are located on the outer shell 11. Specifically, the outer shell 11 communicates with the outside through a first cavity 114 via the centralized exhaust outlet 113. The inner shell 12 is located within the first cavity 114 and spaced apart from the inner wall of the outer shell 11. A liquid outlet 121 is located on the inner shell 12. The inner shell 12 has a connecting hole 122 communicating with the outside and an axially extending second cavity 123. A push rod 22 and a sealing element 23 are located within the second cavity 123. A pushing assembly 21 is located outside the housing 1, and the pushing assembly 21 and the push rod 22 abut against each other through the connecting hole 122. The second cavity 123, located outside the push rod 22 and the sealing element 23, constitutes a first channel. The water inlet of the first channel is connected to the liquid inlet 111 via the sealing element 23. Therefore, acid mist and hydrogen gas can enter the first cavity 114 through the air inlet 112 and then be discharged to the outside through the centralized exhaust port 113, forming an independent exhaust path. This exhaust path is outside the inner shell 12. The electrolyte or water to be replenished enters the first channel through the liquid inlet 111 and then is discharged into the flooded battery through the liquid outlet 121, forming an independent liquid replenishment path. The liquid replenishment path and the exhaust path do not overlap at all. That is, through the nested arrangement of the inner shell 12 and the outer shell 11, in conjunction with the liquid replenishment unit 2, the liquid replenishment path and the exhaust path are completely separated in space, with no direct interference between them, ensuring the normal operation of the liquid replenishment device.

[0042] In some embodiments of this utility model, as shown in the appendix Figure 4 and attached Figure 5 As shown, to prevent external gas from flowing back into the flooded battery when not in the venting state, a venting gap 115 communicating with the air inlet 112 is provided between the outer wall of the inner shell 12 and the inner wall of the outer shell 11. The venting gap 115 and the first cavity 114 communicate to form the second channel in the venting path. The narrow venting gap 115 creates a large resistance to the reverse flow of gas, and because the external gas does not have sufficient pressure, the external gas cannot flow back into the flooded battery through the venting gap 115. This ensures that the gas can only flow unidirectionally along the direction of the air inlet 112, the second channel, and the centralized exhaust port 113, preventing the introduction of impurity gas that could contaminate the electrolyte.

[0043] In some embodiments of this utility model, as shown in the appendix Figure 4 and attached Figure 5 As shown, it also includes an acid filter 3, which is disposed within the first cavity 114 and downstream of the venting gap 115. When there is an open flame or spark outside the flooded battery, it can act as a barrier, preventing the flooded battery from exploding. In this embodiment, the replenishment device integrates multiple functions such as automatic water replenishment, acid filtration, explosion prevention, and centralized venting, effectively improving the versatility of the replenishment device.

[0044] In some embodiments of this utility model, as shown in the appendix Figure 1 To be continued Figure 5 As shown, the actuating component 21 includes a cam portion 211 and a float 212. The cam portion 211 is rotatably connected to the outside of the housing 1 and fixedly connected to the float 212. Specifically, when the electrolyte level drops, the float 212 sinks, causing the cam portion 211 to rotate. The push rod 22 is driven to move away from the inlet 111, thereby driving the seal 23 to move and open the electrolyte replenishment path, initiating the electrolyte replenishment state. When the electrolyte level gradually rises after replenishment, the float 212 rises, causing the cam portion 211 to rotate in the opposite direction. The push rod 22 is driven to move closer to the inlet 111, thereby driving the seal 23 to move and seal the electrolyte replenishment path. The electrolyte replenishment device returns to the full state and stops replenishment. This cycle repeats, with the float 212 rotating according to the electrolyte level, thereby driving the cam portion 211 to rotate and the seal 23 to move, automatically switching between the full state and the replenishment state, ensuring that the electrolyte level inside the battery is always maintained within a suitable range.

[0045] Furthermore, a lever system is formed between the cam 211 and the float 212, with the float 212 as the force-bearing end and the contact portion between the cam 211 and the push rod 22 as the action end. By utilizing the lever principle, the buoyancy force on the float 212 is amplified, thereby enabling precise control of the contact state between the seal 23 and the inlet 111 even when the float 212 is subjected to a small buoyancy force provided by the electrolyte level. This effectively improves the response capability to minute changes in electrolyte level and enables more timely and accurate automatic switching between full and replenishment states.

[0046] In some embodiments of this utility model, as shown in the appendix Figure 1 To be continued Figure 5As shown, the cam section 211 includes a cam connecting rod 2111, a rotating shaft 2112, and a connecting seat 2113. The bottom end of the cam connecting rod 2111 is fixedly connected to the float 212, and the top end of the cam connecting rod 2111 abuts against the push rod 22. The rotating shaft 2112 is rotatably connected to the connecting seat 2113, serving as a fulcrum for rotation, allowing the cam connecting rod 2111 to rotate relative to the connecting seat 2113 under the drive of the float 212, thereby driving the push rod 22 to move. The connecting seat 2113 is fixedly connected to the bottom outer wall of the housing 1 to prevent wobbling or displacement of the cam connecting rod 2111 during rotation, ensuring stable rotation of the cam connecting rod 2111 around the rotating shaft 2112 as a fulcrum and guaranteeing the accuracy of transmission. More specifically, when the electrolyte level drops, the float 212 sinks accordingly, causing the cam connecting rod 2111 to rotate downward around the rotating shaft 2112. The push rod 22 is driven by the top of the cam connecting rod 2111 to move away from the liquid inlet 111, thereby driving the seal 23 to move to open the liquid replenishment path. Electrolyte or water flows into the liquid replenishment path, and the liquid replenishment state is activated. When the electrolyte level gradually rises after liquid replenishment, the float 212 rises accordingly, causing the cam connecting rod 2111 to rotate upward around the rotating shaft 2112. The push rod 22 is driven by the top of the cam connecting rod 2111 to move towards the liquid inlet 111, thereby driving the seal 23 to move to seal the liquid replenishment path. The liquid replenishment device returns to the full state, stops liquid replenishment, and repeats the cycle, automatically switching between the full state and the liquid replenishment state.

[0047] It is worth noting that the distance from the connection end of the cam connecting rod 2111 to the float 212 to the rotating shaft 2112 is L1, and the distance from the connection end of the cam connecting rod 2111 to the push rod 22 to the rotating shaft 2112 is L2. The ratio of L1 to L2, the position of the fulcrum, and other parameters can be selected and adjusted by those skilled in the art according to the water replenishment height requirements, product requirements, and quality requirements, so as to adjust the leverage force on the push rod 22 and the seal 23, thereby adapting to different liquid replenishment needs. No limitation is made here. Preferably, L1 > L2. This is because, according to the lever principle, L1 > L2 means that the effort arm of the lever is greater than the resistance arm, and a smaller amount of power is needed to overcome a larger resistance. Therefore, in the liquid replenishment device, the smaller buoyancy of the float 212 can cause the push rod 22 to experience a larger force through the cam connecting rod 2111, thereby achieving a rapid response to changes in liquid level and improving the sensitivity of the liquid replenishment device.

[0048] In some embodiments of this utility model, as shown in the appendix Figure 1As shown, the push rod 22 includes a push rod body 221 and a push rod base 222. The top end of the push rod body 221 is provided with a mounting hole 2211 for overlapping and fitting with the seal 23. The bottom end of the push rod body 221 is fixedly connected to the top end of the push rod base 222. The bottom end of the push rod base 222 abuts against the cam portion 211. The push rod base 222 plays a supporting role and can transmit force to the push rod body 221 under the action of the cam portion 211 and drive the seal 23 to move.

[0049] In some embodiments of this utility model, as shown in the appendix Figure 1 As shown, the push rod body 221 is cross-shaped and integrally formed. The inner angle area formed by the intersection of adjacent plates can serve as a guide channel to help the electrolyte or water flow along the direction of the guide channel, effectively guiding the electrolyte or water to enter the outlet 121 through the first channel and into the flooded battery more quickly.

[0050] In some embodiments of this utility model, as shown in the appendix Figure 1 As shown, the outer casing 11 also includes a top cover 116 and a side wall 117. The top cover 116 is sealed and fixed to the top of the side wall 117. Preferably, the top cover 116 is fixed by ultrasonic welding to ensure airtightness and prevent liquid leakage from the connection between the top cover 116 and the side wall 117. A liquid inlet 111 is opened on the top cover 116, and there is at least one liquid outlet 121 opened at the bottom of the inner casing 12. The liquid replenishment path consists of the liquid inlet 111, the first channel, and the liquid outlet 121 from top to bottom. A centralized exhaust port 113 is opened on the side wall 117, and the exhaust path consists of the air inlet 112, the second channel, and the centralized exhaust port 113.

[0051] In some embodiments of this utility model, as shown in the appendix Figure 1 Appendix Figure 4 and attached Figure 5 As shown, the end of the push rod 22 connected to the seal 23 is provided with an indicator rod 223. The indicator rod 223 moves with the movement of the float 212. The housing 1 is provided with a mounting position 13 corresponding to the indicator rod 223. The mounting position 13 is made of transparent material, so the user can directly observe the position of the liquid level indicator block 4 and use it to judge the liquid level of the electrolyte in the rich electrolyte battery.

[0052] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A liquid replenishing device for a flooded battery, characterized by comprising: Includes the housing and the liquid replenishment unit. The housing has a liquid inlet, a liquid outlet, an air inlet, a centralized exhaust outlet, a first channel for liquid flow, and a second channel for exhaust. The liquid inlet, the first channel, and the liquid outlet form a liquid replenishment path, and the air inlet, the second channel, and the centralized exhaust outlet form an exhaust path. The liquid replenishment path and the exhaust path are independent of each other. The electrolyte replenishment unit includes a pushing component, a push rod, and a sealing element that are sequentially connected. The pushing component is used to drive the push rod and then the sealing element to move by the change in the electrolyte level. The sealing element is used to control the opening and closing of the first channel.

2. The liquid replenishing device for a liquid rich battery according to claim 1, wherein The housing includes an outer shell and an inner shell; The liquid inlet, the air inlet, and the centralized exhaust outlet are located on the outer shell. The outer shell is specifically connected to the outside through a first cavity via the centralized exhaust outlet. The inner shell is located within the first cavity and is spaced apart from the inner wall of the outer shell. The liquid outlet is located on the inner shell. The inner shell has a connecting hole connected to the outside and an axially extending second cavity. The push rod and the sealing element are located within the second cavity. The pushing assembly is located outside the shell. The pushing assembly and the push rod abut against each other through the connecting hole. The second cavity located outside the push rod and the seal forms the first channel, and the water inlet of the first channel is connected to the liquid inlet through the seal.

3. The liquid replenishing device for a liquid rich battery according to claim 2, wherein There is a ventilation gap between the outer wall of the inner shell and the inner wall of the outer shell, which communicates with the air inlet. The ventilation gap and the first cavity communicate to form the second channel.

4. The liquid replenishing device for a liquid rich battery according to claim 3, wherein It also includes an acid filter, which is disposed in the first cavity and located downstream of the ventilation gap.

5. The liquid replenishing device for a liquid rich battery according to claim 1, wherein The pushing assembly includes a cam and a float. The cam is rotatably connected to the outside of the housing and fixedly connected to the float, so that it rotates relative to the housing through a lever action driven by the float and drives the push rod to move.

6. The liquid replenishing device for a liquid rich battery according to claim 5, wherein The cam section includes a cam connecting rod, a rotating shaft, and a connecting seat. The connecting seat is fixedly connected to the outer wall of the bottom of the housing. The bottom end of the cam connecting rod is fixedly connected to the float. The top end of the cam connecting rod abuts against the push rod. The rotating shaft is rotatably connected to the connecting seat so that the cam connecting rod can rotate relative to the connecting seat under the drive of the float, thereby driving the push rod to move.

7. The liquid replenishing device for a liquid rich battery according to claim 5, wherein The push rod includes a push rod body and a push rod base. The top end of the push rod body is provided with a mounting hole for fitting with the seal. The bottom end of the push rod body is fixedly connected to the top end of the push rod base. The bottom end of the push rod base abuts against the cam portion so as to drive the push rod body to move under the action of the cam portion.

8. The liquid replenishing device for a liquid rich battery according to claim 7, wherein The push rod body is cross-shaped and integrally formed.

9. The liquid replenishing device for a liquid rich battery of claim 2 wherein, The outer casing also includes a top cover and a side wall. The top cover is sealed and fixed to the top of the side wall. The liquid inlet is opened on the top cover, and the centralized exhaust port is opened on the side wall. The number of liquid outlets is at least one and is located at the bottom end of the inner shell.

10. The liquid replenishing device for a liquid rich battery of claim 1 wherein, The end of the push rod connected with the sealing element is provided with an indicating rod, the housing is provided with a mounting position corresponding to the indicating rod, and the mounting position is made of transparent material.

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