Lead-acid storage battery liquid injection valve

Abstract

The invention discloses a lead-acid storage battery liquid injection valve which comprises a valve body and a liquid inlet pipe installed in the valve body, a valve element is arranged in the liquid inlet pipe, a conical inner hole is formed in the lower end in a water inlet channel, and the valve element is located in the conical inner hole and is in sealing fit with the conical inner hole when moving downwards; the liquid inlet pipe is provided with a liquid discharge branch pipe, the liquid discharge branch pipe is provided with a liquid discharge hole, the liquid discharge hole is provided with a plugging device, and when an electrolyte conveying pipe joint connected to the liquid inlet pipe is pulled out, the plugging device moves to open the liquid discharge hole so as to discharge the residual electrolyte in the water inlet channel into the battery. The first plugging plate is matched with the liquid discharge branch pipe, so that when the conveying pipe joint is removed, the liquid discharge hole is automatically opened to discharge the electrolyte remained in the liquid inlet pipe into the battery, further, more electrolyte is prevented from being remained in the liquid inlet pipe, and the first plugging plate is automatically reset to plug the liquid discharge hole again, so that the safety of the battery is improved. And electrolyte in the battery is prevented from being poured out from the liquid discharge hole.

Description

Technical Field

[0001] The present invention relates to the technical field of battery filling valves, and particularly relates to a filling valve for lead-acid batteries. Background Art

[0002] As a widely used chemical power source, the performance and safety of lead-acid batteries largely depend on the appropriate injection and management of the electrolyte. The battery filling valve is a key component in lead-acid batteries and is usually installed on the battery end cover. Its main function is to accurately inject the electrolyte into the battery or discharge the waste liquid when necessary to ensure the normal progress of the chemical reaction inside the battery. In the production and maintenance processes of lead-acid batteries, the filling valve not only needs to have high sealing performance to prevent electrolyte leakage but also needs to be easy to operate to meet the requirements of the automated production line. With the progress of technology, the design of lead-acid battery filling valves has been continuously optimized to improve the overall performance of the battery, extend its service life, and reduce maintenance costs.

[0003] For example, Chinese Patent Publication No. CN101847707A in the prior art discloses a battery filling valve, which includes a body, a valve core, a rotating shaft, a lever, a float, and a water inlet channel. A fixed rotating shaft is provided inside the body. On one side in the radial direction of the rotating shaft, a water inlet channel is arranged. The upper end of the water inlet channel is connected to a water inlet interface assembly, and the lower end of the water inlet channel is equipped with a valve core to form a valve device. A lever that can rotate around the rotating shaft is arranged on the rotating shaft. One end of the lever is movably connected to the valve core, and the other end of the lever is movably connected to a float. By introducing the lever structure principle, under the buoyancy provided by the liquid in the storage battery, it controls the opening and closing of the valve and prompts the user whether the storage battery lacks liquid and when to stop adding liquid. In such disclosed filling valves, during the process of adding electrolyte through the water inlet channel, after filling the electrolyte and pulling out the external liquid adding pipe, the lower end of the water inlet channel and the battery inner cavity are closed through the valve core, and the electrolyte will remain in the water adding channel and cannot enter the battery. During handling or use, when the electrolyte in the water adding channel splashes out, it will cause chemical contamination to other components, bringing risks to use. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a filling valve for lead-acid batteries.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions to be implemented:

[0006] A lead-acid battery liquid injection valve includes a valve body and a liquid inlet pipe installed in the valve body. A hollow water inlet channel is provided in the liquid inlet pipe, and a valve core is arranged in the liquid inlet pipe. A floating rod is arranged in the valve body, and a float is connected to the lower end of the floating rod. A rotating lever is arranged in the valve body. One end of the lever is clamped on the floating rod, and the other end of the lever is clamped on the lower end of the valve core. The middle part of the lever is rotatably connected to the valve body, so that when the floating rod moves upward, the valve core moves downward through the transmission of the lever. A conical inner hole is provided at the lower end of the water inlet channel, and the diameter of the upper end of the conical inner hole is larger than that of the lower end. The valve core is located in the conical inner hole and is in sealing cooperation with the conical inner hole when moving downward.

[0007] A drain branch pipe communicating with the inner cavity of the liquid inlet pipe is arranged on the liquid inlet pipe. A drain hole is arranged on the drain branch pipe, and a blocking device is arranged on the drain hole. When the electrolyte delivery pipe joint connected to the liquid inlet pipe is pulled out, the blocking device moves to open the drain hole to drain the residual electrolyte in the water inlet channel into the battery.

[0008] Further, the blocking device includes a connecting rod and a first blocking plate fixed on the connecting rod. The drain hole is located at the bottom of the drain branch pipe and is horizontally arranged. The first blocking plate is located below the drain branch pipe and fits on the bottom of the drain branch pipe to block the drain hole. A first compression spring is arranged in the valve body. The first compression spring is located below the first blocking plate, and one end of the first compression spring abuts against the first blocking plate. A driving mechanism is arranged on the liquid inlet pipe. The driving mechanism is used to drive the connecting rod to move downward when the delivery pipe joint is pulled out of the liquid inlet pipe.

[0009] Further, a sealing ring is arranged at one end of the first blocking plate close to the drain branch pipe, and the sealing ring is located outside the drain hole.

[0010] Further, the driving mechanism includes a movable rod slidably installed on the side wall of the liquid inlet pipe. One end of the movable rod extends into the liquid inlet pipe and is provided with a conical joint. A driving boss extending downward is arranged at the bottom of the rod body of the movable rod located outside the liquid inlet pipe. A second compression spring is arranged at the end of the movable rod far from the liquid inlet pipe. One end of the second compression spring abuts against the end of the movable rod to make the movable rod extend into the liquid inlet pipe. The movable rod is located above the connecting rod. The upper end of the connecting rod passes through the drain branch pipe and extends to the bottom of the movable rod. The height of the lower end of the driving boss is lower than the height of the upper end of the connecting rod.

[0011] Further, transition inclined surfaces are arranged on both sides of the driving boss.

[0012] Further, the movable rod is in sealing cooperation with the liquid inlet pipe, and a limiting block is fixedly connected to the movable rod. The limiting block is located on the side of the liquid inlet pipe close to the second compression spring.

[0013] Further, a end plate is provided at the lower end of the valve body, and the floating rod passes through the end plate and is slidably engaged with the end plate.

[0014] Further, a sealing plate is provided at the upper end of the valve body, the liquid inlet pipe passes through the sealing plate, and the movable rod is located below the sealing plate.

[0015] Further, a sealing ring is provided on the outer side of the valve body, and the sealing ring is cooperated with the battery case to achieve a sealing fit.

[0016] Further, a transmission rod is fixedly connected to the lower end of the valve core, a first groove is formed on the transmission rod, one end of the lever is inserted into the first groove, a second groove is formed on the floating rod, and the other end of the lever is inserted into the second groove.

[0017] The lead-acid battery liquid injection valve provided by the present invention has the following beneficial effects: by the cooperation of the valve core and the conical inner hole, when the electrolyte is filled to the required amount, the valve core plugs the lower end of the liquid inlet pipe, so that the electrolyte cannot be injected into the battery anymore, avoiding overfilling of the electrolyte; by the cooperation of the first sealing plate and the liquid discharge branch pipe, when the delivery pipe joint for injecting the electrolyte is removed after the filling is completed, the liquid discharge hole is automatically opened to discharge the remaining electrolyte in the liquid inlet pipe into the battery, thereby avoiding a large amount of remaining electrolyte in the liquid inlet pipe, and the first sealing plate automatically resets to plug the liquid discharge hole again, preventing the electrolyte inside the battery from pouring out from the liquid discharge hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes in detail the specific embodiments of the present invention with reference to the drawings:

[0019] Figure 1 is a schematic structural diagram of a lead-acid battery liquid injection valve provided by the present invention;

[0020] Figure 2 is Figure 1 a partial structural diagram of part A in

[0021] Figure 3 is Figure 1 a partial structural diagram of part B in

[0022] Figure 4 is a schematic side view of the cooperation between the transmission rod and the lever in a lead-acid battery liquid injection valve provided by the present invention;

[0023] Figure 5 is a schematic side view of the cooperation between the floating rod and the lever in a lead-acid battery liquid injection valve provided by the present invention;

[0024] Figure 6 is a schematic structural diagram of the state of a lead-acid battery liquid injection valve provided by the present invention when connecting the delivery pipe joint;

[0025] Figure 7 Schematic diagram of electrolyte flow in the open state of the liquid discharge hole in a liquid injection valve of a lead-acid battery provided by the present invention.

[0026] Explanation of the reference numerals in the figure: 1. Valve body; 11. End plate; 12. Sealing plate; 13. Sealing ring; 2. Liquid inlet pipe; 21. Water inlet channel; 22. Conical inner hole; 3. Valve core; 31. Transmission rod; 32. First groove; 4. Floating rod; 41. Second groove; 5. Float; 6. Lever; 7. Liquid discharge branch pipe; 71. Liquid discharge hole; 8. Plugging device; 81. Connecting rod; 82. First plugging plate; 83. First compression spring; 84. Sealing ring; 9. Driving mechanism; 91. Movable rod; 92. Conical joint; 93. Driving boss; 94. Second compression spring; 95. Transition slope; 96. Limit block; 10. Delivery pipe joint. Specific embodiments

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that all directional indications (such as up-down-left-right-front-back...) in the embodiments of the present invention are only used to explain the relative positional relationship - movement conditions, etc. between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. The described connection can be a direct connection or an indirect connection.

[0030] Such as Figures 1-7As shown in the figure, a liquid injection valve for a lead-acid battery includes a valve body 1 and a liquid inlet pipe 2 installed inside the valve body 1. A hollow water inlet channel 21 is provided in the liquid inlet pipe 2. A valve core 3 is arranged inside the liquid inlet pipe 2. A floating rod 4 is arranged inside the valve body 1, and a float 5 is connected to the lower end of the floating rod 4. A rotating lever 6 is arranged inside the valve body 1. One end of the lever 6 is clamped on the floating rod 4, and the other end of the lever 6 is clamped on the lower end of the valve core 3. The middle part of the lever 6 is rotatably connected to the valve body 1, so that when the floating rod 4 moves upward, the valve core 3 is driven to move downward through the transmission of the lever 6. A conical inner hole 22 is arranged at the lower end inside the water inlet channel 21. The diameter of the upper end of the conical inner hole 22 is larger than that of the lower end. The valve core 3 is located in the conical inner hole 22 and is in sealing cooperation with the conical inner hole 22 when moving downward.

[0031] A liquid discharge branch pipe 7 communicating with the inner cavity of the liquid inlet pipe 2 is arranged on the liquid inlet pipe 2. A liquid discharge hole 71 is arranged on the liquid discharge branch pipe 7, and a blocking device 8 is arranged on the liquid discharge hole 71. When the electrolyte delivery pipe joint 10 connected to the liquid inlet pipe 2 is pulled out, the blocking device 8 moves to open the liquid discharge hole 71 to discharge the residual electrolyte in the water inlet channel 21 into the battery.

[0032] With the above technical solution, the battery liquid injection valve is installed on the upper cover of the battery. When it is necessary to inject electrolyte into the battery, the delivery pipe connected to the external electrolyte delivery pump is inserted into the liquid inlet pipe 2 through the joint, and electrolyte is delivered into the liquid inlet pipe 2. The electrolyte flows into the battery through the liquid inlet pipe 2. When the electrolyte in the battery reaches the set amount, the float 5 contacts the electrolyte liquid level and generates buoyancy. Under the buoyancy of the float 5, the floating rod 4 moves upward. The upward movement of the floating rod 4 drives the lever 6 to rotate. One end of the lever 6 close to the valve core 3 moves downward to drive the valve core 3 to move downward. After the valve core 3 moves downward, the valve core 3 is in sealing cooperation with the conical inner hole 22. The valve core 3 blocks the lower end of the liquid inlet pipe 2, so that the liquid inlet pipe 2 is closed with the inner cavity of the battery, and the electrolyte cannot enter the battery from the liquid inlet pipe 2, avoiding overfilling. After the electrolyte addition is completed, the electrolyte delivery pump stops delivering, and the delivery pipe joint 10 is pulled out; when the delivery pipe joint 10 is pulled out, it drives the blocking device 8 to open the liquid discharge hole 71 on the liquid discharge branch pipe 7, so that the electrolyte remaining in the liquid inlet pipe 2 flows into the battery through the liquid discharge hole 71, thereby avoiding the retention of electrolyte in the liquid inlet pipe 2.

[0033] Specifically, the sealing device 8 includes a connecting rod 81 and a first sealing plate 82 fixed on the connecting rod 81, the drainage hole 71 is located at the bottom of the drainage branch pipe 7 and is horizontally arranged, wherein the first sealing plate 82 is located below the drainage branch pipe 7 and fits against the bottom of the drainage branch pipe 7 to seal the drainage hole 71, and a first compression spring 83 is arranged in the valve body 1, and the first compression spring 83 is located below the first sealing plate 82 and one end of the first compression spring 83 abuts against the first sealing plate 82; a driving mechanism 9 is arranged on the liquid inlet pipe 2, and the driving mechanism 9 is used to drive the connecting rod 81 to move downward when the delivery pipe joint 10 is pulled out of the liquid inlet pipe 2. The sealing device 8 seals the drainage hole 71 through the first sealing plate 82. When the delivery pipe joint 10 is pulled out of the liquid inlet pipe 2, the driving connecting rod 81 moves downward, thereby driving the first sealing plate 82 to separate from the drainage branch pipe 7, and the drainage hole 71 is connected with the inner cavity of the valve body 1, and the drainage branch pipe 7 is connected with the liquid inlet pipe 2, so that the electrolyte in the liquid inlet pipe 2 flows downward from the drainage hole 71 in the drainage branch pipe 7 into the battery, avoiding the electrolyte remaining in the liquid inlet pipe 2 to the pipe mouth of the liquid inlet pipe 2; after the driving mechanism 9 is separated from the connecting rod 81, the elastic force of the first compression spring 83 causes the first sealing plate 82 to reset and fit to the bottom of the drainage branch pipe 7, and the drainage hole 71 is sealed again, avoiding the electrolyte inside the battery from pouring out from the drainage hole 71.

[0034] Specifically, a sealing ring 84 is provided on the first blocking plate 82 near one end of the drainage branch pipe 7, and the sealing ring 84 is located outside the drainage hole 71. The sealing ring 84 contacts the outer wall of the drainage branch pipe 7 to form a sealing fit.

[0035] Specifically, the driving mechanism 9 includes a movable rod 91 slidably mounted on the side wall of the liquid inlet pipe 2, one end of the movable rod 91 extends into the liquid inlet pipe 2 and is provided with a conical joint 92, the conical joint 92 is used to abut against the delivery pipe joint 10, the movable rod 91 is located on the outside of the liquid inlet pipe 2 and is provided with a downwardly extending driving boss 93 at the bottom of the rod body, the movable rod 91 is provided with a second compression spring 94 at one end of the movable rod 91 away from the liquid inlet pipe 2, one end of the second compression spring 94 abuts against the end of the movable rod 91 so that the movable rod 91 extends into the liquid inlet pipe 2; the movable rod 91 is located above the connecting rod 81, the upper end of the connecting rod 81 passes through the discharge branch pipe 7 and extends to the bottom of the movable rod 91, and the lower end height of the driving boss 93 is lower than the upper end height of the connecting rod 81. When the delivery pipe joint 10 is pulled out, the second compression spring 94 provides elastic force to move the movable rod 91 toward the center position of the liquid inlet pipe 2. When the movable rod 91 moves parallely, it drives the driving boss 93 to move parallely, and then drives the boss 93 to squeeze the connecting rod 81 so that the connecting rod 81 bounces downward to drive the first blocking plate 82 to disengage from the drainage branch pipe 7, and open the drainage hole 71 to discharge the retained electrolyte in the liquid inlet pipe 2 into the battery.

[0036] Specifically, transition inclined surfaces 95 are provided on both sides of the driving boss 93. When the driving boss 93 moves parallelly, the transition inclined surfaces 95 are in contact with the upper end of the connecting rod 81, thereby squeezing the connecting rod 81 to move downward. The movable rod 91 is in sealing fit with the liquid inlet pipe 2, and a limiting block 96 is fixedly connected to the movable rod 91. The limiting block 96 is located on the side of the liquid inlet pipe 2 close to the second compression spring 94. By providing the limiting block 96, the moving displacement of the movable rod 91 is limited to prevent the movable rod 91 from extending too far into the liquid inlet pipe 2 under the elastic force of the second compression spring 94.

[0037] A end plate 11 is provided at the lower end of the valve body 1. The floating rod 4 passes through the end plate 11 and is in sliding fit with the end plate 11. A sealing plate 12 is provided at the upper end of the valve body 1. The liquid inlet pipe 2 passes through the sealing plate 12, and the movable rod 91 is located below the sealing plate 12. A sealing ring 13 is provided on the outer side of the valve body 1. The sealing ring 13 is in sealing fit with the battery case to form a relatively enclosed space for the electrolyte in the battery case, preventing the internal electrolyte from flowing out.

[0038] Specifically, a transmission rod 31 is fixedly connected to the lower end of the valve core 3. A first groove 32 is formed in the transmission rod 31. One end of the lever 6 is inserted into the first groove 32. A second groove 41 is formed in the floating rod 4. The other end of the lever 6 is inserted into the second groove 41. By inserting one end into the first groove 32 and the other end into the second groove 41, the lever 6 realizes the transfer of the up and down movement of the floating rod 4 to the valve core 3 to drive the valve core 3 to move. The float 5 is of a hollow structure. Thus, after a certain amount of electrolyte is filled, the float 5 contacts the electrolyte liquid level. The hollow float 5 generates a large buoyancy force, thereby driving the floating rod 4 to move upward as the electrolyte liquid level rises.

[0039] The working principle of a liquid injection valve for a lead-acid battery provided by the present invention is as follows: When in use, the battery liquid injection valve is installed on the upper cover of the battery. When it is necessary to inject electrolyte into the battery, the delivery pipe connected to the external electrolyte delivery pump is inserted into the liquid inlet pipe 2 through the delivery pipe joint 10. When the delivery pipe joint 10 is inserted into the liquid inlet pipe 2, it drives the moving rod to move away from the liquid inlet pipe 2 and remains clamped on the delivery pipe joint 10, so that the delivery pipe is kept stable. When the moving rod moves away from the liquid inlet pipe 2, it drives the boss 93 to drive the connecting rod 81 to move downward and then the connecting rod 81 resets, so that the first sealing plate 82 seals the drain hole 71 and keeps the drain hole 71 in a closed state; The electrolyte is delivered into the liquid inlet pipe 2, and the electrolyte flows into the battery through the liquid inlet pipe 2. When the electrolyte in the battery reaches the set amount, the float 5 contacts the electrolyte liquid level and generates buoyancy. As the electrolyte continues to be injected, the electrolyte liquid level rises, so that the float 5 rises under the action of buoyancy, and then the floating rod 4 moves upward. The upward movement of the floating rod 4 drives the lever 6 to rotate. The end of the lever 6 close to the valve core 3 moves downward to drive the valve core 3 to move downward. After the valve core 3 moves downward, the valve core 3 is in sealing fit with the conical inner hole 22, and the valve core 3 seals the lower end of the liquid inlet pipe 2, so that the liquid inlet pipe 2 is closed with the battery inner cavity, and the electrolyte cannot enter the battery from the liquid inlet pipe 2, avoiding over-adding. After the electrolyte addition is completed, the electrolyte delivery pump stops delivering, and the delivery pipe joint 10 is pulled out; When the delivery pipe joint 10 is pulled out, the second compression spring 94 provides elastic force to make the movable rod 91 move towards the center position of the liquid inlet pipe 2. When the movable rod 91 moves parallelly, it drives the driving boss 93 to move parallelly. After the driving boss 93 moves, it contacts and presses the connecting rod 81 to make the connecting rod 81 bounce downward to drive the first sealing plate 82 to disengage from the drain branch pipe 7. The drain hole 71 is communicated with the inner cavity of the valve body 1, and the drain branch pipe 7 is communicated with the liquid inlet pipe 2, so that the electrolyte in the liquid inlet pipe 2 flows downward from the drain hole 71 in the drain branch pipe 7 into the battery, avoiding the electrolyte filled to the pipe orifice of the liquid inlet pipe 2 remaining in the liquid inlet pipe 2; After the driving boss 93 continues to move and disengages from the connecting rod 81, under the action of the elastic force of the first compression spring 83, the first sealing plate 82 resets and fits on the bottom of the drain branch pipe 7, and seals the drain hole 71 again, avoiding the electrolyte inside the battery from pouring out from the drain hole 71.

[0040] For the parts not involved in this technical solution, the prior art can be adopted to implement them.

[0041] The above shows and describes the basic principle, main features and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention includes the appended claims and their equivalents.

Claims

1. A lead-acid battery filling valve, comprising a valve body (1) and a liquid inlet pipe (2) installed in the valve body (1), wherein a hollow water inlet channel (21) is arranged in the liquid inlet pipe (2), a valve core (3) is arranged in the liquid inlet pipe (2), a floating rod (4) is arranged in the valve body (1), and a float (5) is connected to the lower end of the floating rod (4); a rotatable lever (6) is arranged in the valve body (1), one end of the lever (6) is clamped on the floating rod (4), and the other end of the lever (6) is clamped on the lower end of the valve core (3), and the middle part of the lever (6) is rotatably connected to the valve body (1), so that when the floating rod (4) moves upward, the valve core (3) is moved downward through the transmission of the lever (6), characterized in that: A conical inner hole (22) is provided at the lower end of the water inlet channel (21), the upper end diameter of the conical inner hole (22) is larger than the lower end diameter, the valve core (3) is located in the conical inner hole (22), and the valve core (3) is sealed with the conical inner hole (22) when moving downward; The liquid inlet pipe (2) is provided with a drainage branch pipe (7) which is in communication with the inner cavity of the liquid inlet pipe (2); the drainage branch pipe (7) is provided with a drainage hole (71); the drainage hole (71) is provided with a blocking device (8); when the electrolyte delivery pipe joint (10) connected to the liquid inlet pipe (2) is pulled out, the blocking device (8) moves to open the drainage hole (71) so as to discharge the residual electrolyte in the water inlet channel (21) into the battery.

2. A lead-acid battery filling valve according to claim 1, characterized in that: The blocking device (8) comprises a connecting rod (81) and a first blocking plate (82) fixed on the connecting rod (81); the drainage hole (71) is located at the bottom of the drainage branch pipe (7) and is arranged horizontally, wherein the first blocking plate (82) is located below the drainage branch pipe (7) and is attached to the bottom of the drainage branch pipe (7) to block the drainage hole (71); a first compression spring (83) is arranged in the valve body (1); the first compression spring (83) is located below the first blocking plate (82) and one end of the first compression spring (83) abuts against the first blocking plate (82); a driving mechanism (9) is arranged on the liquid inlet pipe (2); the driving mechanism (9) is used to drive the connecting rod (81) to move downward when the delivery pipe joint (10) is pulled out of the liquid inlet pipe (2).

3. A lead-acid battery filling valve according to claim 2, characterized in that: A sealing ring (84) is provided on one end of the first sealing plate (82) close to the drainage branch pipe (7), and the sealing ring (84) is located outside the drainage hole (71).

4. A lead-acid battery filling valve according to claim 2, characterized in that: The driving mechanism (9) comprises a movable rod (91) slidably mounted on the side wall of the liquid inlet pipe (2), one end of the movable rod (91) extending into the liquid inlet pipe (2) and provided with a conical joint (92), a driving boss (93) extending downwardly provided at the bottom of the rod body of the movable rod (91) located outside the liquid inlet pipe (2), a second compression spring (94) provided at one end of the movable rod (91) away from the liquid inlet pipe (2), one end of the second compression spring (94) abutting against the end of the movable rod (91) so that the movable rod (91) extends into the liquid inlet pipe (2); the movable rod (91) is located above the connecting rod (81), the upper end of the connecting rod (81) passes through the liquid discharge branch pipe (7) and extends to the bottom of the movable rod (91), and the lower end of the driving boss (93) is lower than the upper end of the connecting rod (81).

5. A lead-acid battery filling valve according to claim 4, characterized in that: Transition slopes (95) are provided on both sides of the driving boss (93).

6. A lead-acid battery filling valve according to claim 4, characterized in that: The movable rod (91) is sealed and matched with the liquid inlet pipe (2); a limit block (96) is fixedly connected to the movable rod (91); and the limit block (96) is located on a side of the liquid inlet pipe (2) close to the second compression spring (94).

7. A lead-acid battery filling valve according to claim 2, characterized in that: An end plate (11) is provided at the lower end of the valve body (1), and the floating rod (4) passes through the end plate (11) and is slidably matched with the end plate (11).

8. A lead-acid battery filling valve according to claim 2, characterized in that: A sealing plate (12) is provided at the upper end of the valve body (1), the liquid inlet pipe (2) passes through the sealing plate (12), and the movable rod (91) is located below the sealing plate (12).

9. A lead-acid battery filling valve according to claim 2, characterized in that: A sealing ring (13) is provided on the outer side of the valve body (1), and the sealing ring (13) cooperates with the battery housing to achieve sealing.

10. A lead-acid battery filling valve according to claim 2, characterized in that: The lower end of the valve core (3) is fixedly connected to a transmission rod (31), the transmission rod (31) is provided with a first groove (32), one end of the lever (6) is inserted into the first groove (32), and the floating rod (4) is provided with a second groove (41), the other end of the lever (6) is inserted into the second groove (41).

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