An automatic water replenishment system for traction lead-acid batteries

Abstract

The present invention provides an automatic water replenishing system for traction lead-acid batteries, which relates to the technical field of batteries and solves the technical problem that it is very inconvenient to replenish water by gravity in existing lead-acid batteries. The system includes a one-way pressure relief valve, a controller, a water replenishing device, a flow sensor and a main control liquid level sensor which are respectively connected to the controller in a signal connection manner. The water replenishing device includes a water outlet pipeline, a water return pipeline, a water tank, a pumping motor and a plurality of liquid injection valves; the main control liquid level sensor is located in the liquid injection valve at the end of water injection, and the one-way pressure relief valve and the flow sensor are installed in the water return pipeline. After the battery pack is short of water, the main control liquid level sensor sends a signal, and the controller starts the pumping motor to replenish water to the corresponding sub-control liquid injection valve. After the water replenishment is completed, the return water flushes open the one-way pressure relief valve, and the flow sensor sends a water replenishment completion signal to the controller. The controller controls the pumping motor to close, completing the fully automatic water filling and injection operation for the lead-acid battery. Compared with the existing method of replenishing water by gravity, it is very convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of storage batteries, and in particular to an automatic water replenishing system for traction lead-acid batteries. Background Art

[0002] Lead-acid batteries are still the mainstream for backup, storage, and starting power supplies at present. However, during the charge and discharge process, the evaporation rate of the electrolyte is relatively large. If distilled water is not added in time and the liquid level of the lead-acid battery is not maintained, the evaporation of the electrolyte will occur. The decrease in the electrolyte level of the lead-acid battery is likely to damage the electrode plates and affect its normal use. In severe cases, the battery will be damaged, causing economic losses to users. Most of the existing automatic water replenishing devices for forklift batteries use a float injection valve to install the water inlet pipe and then connect it to the liquid storage tank bucket filled with electrolyte for water replenishment. This water replenishing method requires placing the liquid storage bucket at a high position and relying on gravity to make the water flow automatically for water replenishment, that is, a certain height difference is required for water replenishment. Generally, the liquid storage bucket is 1.5 - 2 m higher than the injection valve of the battery. The liquid storage bucket needs to be configured on a relatively high storage rack. When the battery needs to be replenished with liquid, the storage rack has to be pushed to the equipment that needs to be filled with liquid, or the equipment that needs to be filled with liquid has to be moved to the storage rack side to replenish the liquid. It can be seen that the liquid replenishment process is very inconvenient. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic water replenishing system for traction lead-acid batteries to solve the technical problem that the gravity-based water replenishment of lead-acid batteries in the prior art is very inconvenient. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] An automatic water replenishing system for traction lead-acid batteries provided by the present invention includes a water replenishing device, a controller, a one-way pressure relief valve, a flow sensor, and a main control liquid level sensor. The water replenishing device, the flow sensor, and the main control liquid level sensor are respectively connected to the controller in a signal connection;

[0006] Among them, the water replenishing device includes a water outlet pipeline, a water return pipeline, a water tank, a pumping motor and a plurality of liquid injection valves. The water tank is communicated with the water inlet of the pumping motor, and the water outlet of the pumping motor is communicated with a plurality of liquid injection valves through the water outlet pipeline; one of the liquid injection valves can be correspondingly arranged in each battery pack, and the main control liquid level sensor is arranged in the liquid injection valve in the battery pack at the end of water injection; the one-way pressure relief valve and the flow sensor are installed in the water return pipeline; the controller can receive the water replenishing signal sent by the main control liquid level sensor to start the pumping motor to replenish water to the storage battery. After the water replenishment of each battery pack is completed, the plurality of liquid injection valves are automatically closed, and the water flows back through the water return pipeline and opens the one-way pressure relief valve through the pressure of the water. The return water enters the flow sensor through the one-way pressure relief valve, and the controller diagnoses the completion of water replenishment according to the signal fed back by the flow sensor and controls the pumping motor to close.

[0007] Optionally, the plurality of liquid injection valves are composed of a plurality of sub-control liquid inlet valves and at least one main control liquid inlet valve. The main control liquid inlet valve is located in the battery pack at the end of water injection, and the main control liquid level sensor is installed in the main control liquid inlet valve.

[0008] Optionally, the liquid injection valve includes a control valve body, a water inlet tee, a diverter, an extension rod, a movable lever, a stop valve and a float. The diverter is arranged in the accommodating cavity of the control valve body, and the water inlet tee is buckled and clamped on the control valve body; the lower end of the extension rod is fixedly connected with the float, and the middle section of the extension rod is slidably sleeved at the bottom of the diverter; the water inlet of the water inlet tee is communicated with the water outlet pipeline, the water outlet of the water inlet tee is communicated with the water inlet of the diverter, and the stop valve is slidably arranged at the water outlet of the diverter; the first end of the movable lever is rotatably arranged on the extension rod, the diverter has a convex fulcrum, and the second end of the movable lever is clamped on the stop valve.

[0009] Optionally, the liquid injection valve further includes an upper cover, and the upper cover has a display window; the upper end of the extension rod extends upward to form a color display part, and the color display part is correspondingly arranged with the display window.

[0010] Optionally, the water inlet of the reducing tee is communicated with the water tank, the first water outlet of the reducing tee is communicated with the water outlet pipeline after passing through the pumping motor, and the second water outlet of the reducing tee is communicated with the water return pipeline.

[0011] Optionally, the water replenishing system further includes a control unit housing. The circuit board of the controller, the reducing tee, the pumping motor, the one-way pressure relief valve and the flow sensor are all arranged in the control unit housing; and an inlet joint, an outlet joint and a return water joint are arranged on the control unit housing.

[0012] Optionally, the one-way pressure relief valve includes a water inlet housing, a flow dividing plug, a spring, and a water outlet housing. The water inlet housing is snap-connected to the water outlet housing to form a receiving cavity. The flow dividing plug is axially slidably disposed on the side of the receiving cavity close to the water inlet housing and seals the receiving cavity. The first end of the spring is sleeved and abutted against the flow dividing plug, and the second end of the spring abuts against the inner wall of the water outlet housing.

[0013] Optionally, the flow sensor includes an upper housing, a lower housing, an impeller, and a magnet. The upper housing and the lower housing are respectively provided with a water outlet and a water inlet. The impeller is disposed in a cavity formed between the upper housing and the lower housing; two magnets are disposed at the upper ends of the blades of the impeller.

[0014] Optionally, the water replenishing device further includes a water inlet three-way joint and a water return three-way joint. The water outlet pipeline includes two parallel water supply branches, and each water supply branch has a plurality of the sub-control liquid inlet valves and a main control liquid inlet valve; the water inlet three-way joint is located at the connection of the water outlet pipeline and the two water supply branches, and the water return three-way joint is located at the connection of the two water supply branches and the water return pipeline.

[0015] Optionally, the main control liquid level sensor is a photoelectric switch.

[0016] An automatic water replenishing system for a traction lead-acid battery provided by the present invention includes a water replenishing device, a controller, a one-way pressure relief valve, a flow sensor, and a main control liquid level sensor. The water replenishing device, the flow sensor, and the main control liquid level sensor are respectively in signal connection with the controller; a liquid injection valve is provided in each battery pack constituting the battery. When a battery pack is short of water, the main control liquid level sensor in the liquid injection valve at the end of the battery pack sends a water replenishing signal to the controller. The controller starts a pumping motor, and water is replenished to each liquid injection valve through a water outlet pipeline. After each battery pack is filled, its corresponding liquid injection valve closes, and water is replenished to the next battery pack; after the water replenishment of the battery packs is completed, each liquid injection valve automatically closes; at this time, the pressure in the water return pipeline increases to open the one-way pressure relief valve, and water enters the flow sensor through the one-way pressure relief valve. The flow sensor transmits a signal to the controller, and the controller diagnoses whether the water levels of all the battery packs are filled. If so, the controller controls the pumping motor to close, thereby completing the fully automatic water filling and injection operation of the lead-acid battery. Compared with the existing gravity water replenishing method, it is very convenient and efficient, avoids the phenomenon that the lead-acid battery loses water due to untimely maintenance, resulting in battery failure, and effectively increases the service life of the lead-acid battery. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of an automatic water replenishing system for a forklift traction lead-acid battery provided by the specific embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the positional relationship between the water tank and the battery;

[0020] Figure 3 It is a schematic diagram of the connection relationship of each device inside the control unit housing;

[0021] Figure 4 It is a front view sectional structural diagram of a liquid injection valve provided by the specific embodiment of the present invention;

[0022] Figure 5 It is a rear view structural diagram of the liquid injection valve;

[0023] Figure 6 It is a sectional structural diagram of the liquid injection valve, and the arrow in the figure shows the flow direction of the liquid entering from the three-way valve;

[0024] Figure 7 It is a connection structural diagram of the control valve body and the three-way valve;

[0025] Figure 8 It is a partial sectional view structural diagram after removing the control valve body;

[0026] Figure 9 It is a three-dimensional structural diagram of the liquid injection valve;

[0027] Figure 10 It is an exploded structural diagram of the sub-control liquid inlet valve;

[0028] Figure 11 It is an exploded structural diagram of the main control liquid inlet valve;

[0029] Figure 12 It is a three-dimensional structural diagram of the one-way pressure relief valve;

[0030] Figure 13 It is an exploded structural diagram of the one-way pressure relief valve;

[0031] Figure 14 A sectional structural diagram of the one-way pressure relief valve, and the arrow in the figure is the water flow direction;

[0032] Figure 15It is a schematic diagram of the explosion structure of a flow sensor, and the arrow in the figure indicates the water flow direction;

[0033] Figure 16 It is a schematic diagram of the control process of an automatic water replenishing system for a forklift traction lead-acid battery according to the present invention;

[0034] Figure 17 It is the control circuit diagram of the automatic water replenishing system for a forklift traction lead-acid battery.

[0035] In the figure: 1. Control unit housing; 2. Water tank; 3. Three-way joint; 4. Battery; 5. Sub-control liquid inlet valve; 6. Main-control liquid inlet valve; 7. Outlet pipeline; 71. Water supply branch; 8. Bracket; 9. Flow sensor; 91. Upper housing; 92. Sealing ring; 93. Vane; 94. Lower housing; 95. Magnet; 10. One-way pressure relief valve; 101. Inlet housing; 102. First sealing ring; 103. Second sealing ring; 104. Shunt plug; 105. Spring; 106. Outlet housing; 107. First installation groove; 108. Second installation groove; 11. Three-way two-way joint; 12. Return water joint; 13. Inlet joint; 14. Outlet joint; 15. Pumping motor; 16. Circuit board; 17. Reducing three-way; 18. Control valve body; 19. Upper cover; 191. Display window; 20. Inlet three-way; 21. Inlet sealing ring; 22. Inlet hole; 23. Shunt; 24. Extension rod; 241. Color display part; 25. Main body sealing ring; 26. Movable lever; 27. Stop valve; 28. Stop valve port; 29. Main-control liquid level sensor; 30. Floating ball; 31. Return water pipeline. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope protected by the present invention.

[0037] As Figure 1 and Figure 2 shown, an automatic water replenishing system for a traction lead-acid battery includes a water replenishing device, a controller, a one-way pressure relief valve 10, a flow sensor 9 and a main-control liquid level sensor 29. The water replenishing device, the flow sensor 9 and the main-control liquid level sensor 29 are respectively connected to the controller in a signal manner;

[0038] Among them, the water replenishing device includes a water outlet pipeline 7, a water return pipeline 31, a water tank 2, a pumping motor 15 and a plurality of liquid injection valves. The water tank 2 is communicated with the water inlet of the pumping motor 15, and the water outlet of the pumping motor 15 is communicated with the plurality of liquid injection valves through the water outlet pipeline 7; a liquid injection valve can be correspondingly arranged in each battery pack, and the main control liquid level sensor 29 is arranged in the liquid injection valve in the battery pack at the end of water injection; a one-way pressure relief valve 10 and a flow sensor 9 are installed in the water return pipeline 31; the controller can receive the water replenishing signal sent by the main control liquid level sensor 29 to start the pumping motor 15 to replenish water to the storage battery 4. After the water replenishment of each battery pack is completed, the plurality of liquid injection valves close automatically, and the water flows back through the water return pipeline 31 and opens the one-way pressure relief valve 10 through the pressure of the water. The return water enters the flow sensor 9 through the one-way pressure relief valve 10, and the controller diagnoses that the water replenishment is completed according to the signal fed back by the flow sensor 9 and controls the pumping motor 15 to close. The water tank 2 is installed on the upper side of the storage battery 4 through a bracket 8.

[0039] A liquid injection valve is arranged in each battery pack that constitutes the storage battery 4. When the battery pack is short of water, the main control liquid level sensor 29 in the liquid injection valve at the end of the battery pack sends a water replenishing signal to the controller. The controller starts the pumping motor 15, and the water replenishes each liquid injection valve through the water outlet pipeline 7. After each battery pack is filled, its corresponding liquid injection valve closes, and the next battery pack is replenished with water; after the water replenishment of the battery pack is completed, each liquid injection valve automatically closes; at this time, the pressure in the water return pipeline 31 increases to open the one-way pressure relief valve 10, and the water enters the flow sensor 9 through the one-way pressure relief valve 10. The flow sensor 9 measures the flow rate and transmits the signal to the controller. The controller diagnoses whether the water level of the battery pack is fully filled. The controller compares the values of the water outlet flow rate and the water return flow rate. If the two are the same, it is determined that it is fully filled, and the controller controls the pumping motor 15 to close, thus completing the fully automatic water filling and injection operation of the lead-acid storage battery 4. Compared with the existing method of relying on gravity to replenish water, it is very convenient and efficient, avoiding the phenomenon that the lead-acid storage battery 4 loses water due to untimely maintenance, resulting in the failure of the storage battery 4, and effectively increasing the service life of the lead-acid storage battery 4.

[0040] As an optional implementation manner, the plurality of liquid injection valves are composed of a plurality of sub-control liquid inlet valves 5 and at least one main control liquid inlet valve 6. The main control liquid inlet valve 6 is located in the battery pack at the end of water injection, and the main control liquid level sensor 29 is installed in the main control liquid inlet valve 6.

[0041] The difference between the main control liquid inlet valve 6 and the sub-control liquid inlet valve 5 is that the main control liquid level sensor 29 for sending a water replenishing signal to the controller is arranged in the main control liquid inlet valve 6; the main control liquid inlet valve 6 is placed in the battery pack at the end of water replenishment, and the sub-control liquid inlet valves 5 are placed in all other battery packs.

[0042] As an optional implementation manner, as Figures 4 - 11As shown in the figure, the liquid injection valve includes a control valve body 18, a water inlet tee 20, a diverter 23, an extension rod 24, a movable lever 26, a stop valve 27, and a float 30. The diverter 23 is disposed in the accommodation cavity of the control valve body 18, and the water inlet tee 20 is snap-fitted to the control valve body 18; the lower end of the extension rod 24 is fixedly connected to the float 30, and the middle section of the extension rod 24 is slidably sleeved on the bottom of the diverter 23; the water inlet of the water inlet tee 20 is communicated with the water outlet pipeline 7, the water outlet of the water inlet tee 20 is communicated with the water inlet of the diverter 23, and the stop valve 27 is slidably disposed at the water outlet of the diverter 23; the first end of the movable lever 26 is rotatably disposed on the extension rod 24, the diverter 23 has a convex fulcrum, and the second end of the movable lever 26 is clamped to the stop valve 27.

[0043] When the liquid level rises, the float 30 drives the extension rod 24 to move upward, the extension rod 24 drives the movable lever 26 to move, the first end of the movable lever 26 moves upward, and the second end of the movable lever 26 moves downward under the action of the convex fulcrum, thereby pressing down to drive the stop valve 27 to move downward. The plug of the stop valve seals the water outlet of the diverter 23, and the liquid filling of this battery pack is completed, and the liquid is diverted to the next battery pack for liquid filling; conversely, when the float 30 descends, the float 30 and the extension rod 24 descend under the action of gravity and drive the stop valve 27 to move upward, and the water outlet channel of the diverter 23 is opened for water replenishment.

[0044] As Figure 7 shown, the control valve body 18 is snap-connected to the water inlet tee 20. As Figure 6 shown, after the liquid injection valve is filled with liquid, a sealed space is formed in the water inlet channel, and the water inlet channel no longer admits water. The diverter 23 is integrally formed by injection molding and is divided into two parts during assembly. See Figure 10 and Figure 11 .

[0045] As an optional implementation manner, as Figure 9 shown, the liquid injection valve further includes an upper cover 19, and the upper cover 19 has a display window 191; the upper end of the extension rod extends upward to form a color display portion, and the color display portion is correspondingly disposed with the display window 191. The color display function is added, and the water replenishment condition can also be observed in the manual mode or when the controller fails, improving the reliability of the system.

[0046] The basic functions of the sub-control liquid inlet valve 5 and the main control liquid inlet valve 6 are both to stop automatically when the water is full. After the battery pack where the sub-control liquid inlet valve 5 is located is filled with water, it depends on the color display to observe whether it is full, and only each one can be observed separately; while the main control liquid inlet valve 6 is installed at the end of the water filling system and is located in the last battery pack filled with water. After it is full of water, the main control liquid level sensor 29 will transmit a signal to the circuit board 16 of the controller, and the controller controls the alarm lamp. By observing the alarm lamp, the water filling condition can be known, so there is no need to observe whether each battery pack is full of water anymore.

[0047] As an alternative implementation, the water replenishing device further includes a reducing tee 17. The water inlet of the reducing tee 17 is communicated with the water outlet of the pumping motor 15, and the two water outlets of the reducing tee 17 are respectively communicated with the water outlet pipeline 7 and the water return pipeline 31.

[0048] After the water replenishment is completed, the water returns through the water return pipeline 31 and is communicated with the water outlet pipeline 7 through the reducing tee 17, which can form an internal circulation inside the water replenishment system before the pumping motor 15 is turned off to prevent the water pipe from bursting.

[0049] As an alternative implementation, as Figure 3 shown, the water replenishment system further includes a control unit housing 1. The circuit board 16 of the controller, the reducing tee 17, the pumping motor 15, the one-way pressure relief valve 10 and the flow sensor 9 are all arranged inside the control unit housing 1; and an inlet joint 13, an outlet joint 14 and a return water joint 12 are arranged on the control unit housing 1. This way is convenient for centralized control.

[0050] Both ends of the inlet joint 13 are respectively communicated with the water tank 2 and the inlet of the reducing tee 17, and the first water outlet of the reducing tee is further communicated with the water inlet of the pumping motor 15; both ends of the outlet joint 14 are respectively communicated with the water outlet of the pumping motor 15 and the water inlet of the front end injection valve; both ends of the return water joint 12 are respectively connected with the injection valve at the end and the water inlet of the one-way pressure relief valve 10.

[0051] As an alternative implementation, as Figures 12 - 14 shown, the one-way pressure relief valve 10 includes an inlet housing 101, a shunt plug 104, a spring 105 and an outlet housing 106. The inlet housing 101 is clamped with the outlet housing 106 to form an accommodation cavity. The shunt plug 104 is blocked and axially slidably arranged on one side of the accommodation cavity close to the inlet housing 101. The first end of the spring 105 is sleeved and abutted against the shunt plug 104, and the second end of the spring 105 abuts against the inner wall of the outlet housing 106.

[0052] The inner wall of the inlet housing 101 has a conical surface, and the shunt plug 104 has a conical section, and the conical section is blocked at the conical surface under the action of the spring 105.

[0053] A first installation groove 107 is formed on the shunt plug 104, and a one-way pressure relief valve 10 seal ring 92 is arranged in the first installation groove 107; a second installation groove 108 is formed on one side of the outlet housing 106 close to the inlet housing 101, and a plug seal ring 92 is arranged in the second installation groove 108.

[0054] When the water in the battery box is filled up, it enters the water inlet of the one-way pressure relief valve 10 through the return water pipeline 31. The water pressure gradually increases. After reaching a certain pressure, the shunt plug 104 is flushed open, the spring 105 is compressed, and the shunt plug 104 moves towards the water outlet housing 106 side. The seal 7 is opened at the sealing cone surfaces of the water inlet housing 101 and the shunt plug 104, and the water flows out from the water outlet; after the water inlet motor is closed, the water flow pressure decreases, the spring 105 rebounds to push the shunt plug 104 to seal with the water inlet housing 101, and the water flow is closed.

[0055] As an alternative embodiment, as Figure 15 shown, the flow sensor 9 includes an upper housing 91, a lower housing 94, an impeller, and a magnet 95. The upper housing 91 and the lower housing 94 are respectively provided with a water outlet and a water inlet. The impeller is arranged in the cavity formed between the upper housing 91 and the lower housing 94; two magnets 95 are arranged at the upper ends of the blades 93 of the impeller.

[0056] When water enters the housing from the water inlet, it drives the impeller to rotate. There are two small magnets 95 installed at the upper end of the impeller. When the impeller rotates, real-time data is transmitted through electromagnetic induction, and the water addition condition of the battery pack can be accurately determined through the real-time data. When the data of the water inlet flow and the water outlet flow are the same, it indicates that the water has been completely filled.

[0057] As an alternative embodiment, as Figure 1 shown, the water replenishing device further includes a water inlet three-way joint 3 and a water return three-way joint 3. The water outlet pipeline 7 includes two parallel water supply branches 71. Each water supply branch 71 has a plurality of sub-control liquid inlet valves 5 and a main control liquid inlet valve 6; the water inlet three-way joint 3 is located at the connection of the water outlet pipeline 7 and the two water supply branches 71, and the water return three-way joint 3 is located at the connection of the two water supply branches 71 and the return water pipeline 31.

[0058] Adopting two water supply branches 71 improves the water replenishing speed and has higher efficiency. The injection valves in each water supply branch 71 are connected in series.

[0059] As an alternative embodiment, the main control liquid level sensor 29 is a photoelectric switch.

[0060] The main control liquid level sensor 29 is a groove type photoelectric switch, adopting a standard U-shaped structure. Its transmitter and receiver are respectively located on both sides of the U-shaped groove and can form an optical axis. When the extension rod 24 moves up with the float 30 and passes through the U-shaped groove and blocks the optical axis, the photoelectric switch generates a switching signal and transmits it to the controller.

[0061] The working process of an automatic water replenishing system for a forklift traction lead-acid battery provided by the specific embodiment of the present invention is as follows: (For the main control flow, see Figure 16 , and for the control circuit diagram, see Figure 17 )

[0062] When the liquid level of the storage battery is lower than the float, the float 30 of the liquid injection valve sinks. The sub-control liquid inlet valve 5 opens, and the main control liquid inlet valve 6 opens synchronously and sends a water replenishment signal to the controller. The circuit board of the controller receives the signal, and the red light starts to flash. Turn on the controller switch to start the water pumping motor 15, draw the replenishing liquid from the water tank 2, pass through the reducing tee 17 in the control unit housing 1, and send the water along the water pipe through the water outlet joint 14 to the water inlet tee joint 3 of the storage battery, and the water is divided and enters from both side branches. After the battery pack is replenished with liquid, the float 30 floats up, and the water inlet channel of the sub-control liquid inlet valve 5 is closed. The water flows together at the return water tee joint 3. At this time, the float 30 of the main control liquid inlet valve 6 floats up, and the built-in main control liquid level sensor 29 sends a signal to the controller, and the full water green light flashes. At this time, the water flows from the return water tee joint 3 through the return water pipe to the return water joint 12 on the control unit housing 1 and converges at the water inlet of the one-way pressure relief valve 10. When the water pressure increases, the one-way pressure relief valve 10 is opened by the impact of the water pressure, and the water flows to the flow sensor 9. After the controller analyzes and judges that the water is full according to the data fed back by the flow sensor 9, the controller controls and closes the water pumping motor 15. Before the water pumping motor 15 is turned off, the excess water flows back to the reducing tee 17 in the control unit housing 1 to form a loop with the water outlet pipeline 7 to prevent the water flow from gathering and causing the pipe to burst. After the liquid addition is completed, the controller enters the screen-off sleep state, and the fully automatic water addition and injection action is completed. Figure 17 Among them, R1 and R2 are 100Ω current-limiting resistors, and R3, R4, and R5 are 510Ω current-limiting resistors; LED1, LED2, and LED3 are all indicator lights.

[0063] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An automatic water replenishing system for a traction lead-acid battery, characterized in that, It includes a water replenishing device, a controller, a one-way pressure relief valve, a flow sensor and a main control liquid level sensor. The water replenishing device, the flow sensor and the main control liquid level sensor are respectively connected to the controller by signals; Among them, the water replenishing device includes an outlet pipeline, a return pipeline, a water tank, a pumping motor and a plurality of liquid injection valves. The water tank is communicated with the water inlet of the pumping motor. The water outlet of the pumping motor is communicated with the plurality of liquid injection valves through the outlet pipeline. One of the liquid injection valves can be correspondingly arranged in each battery pack. The main control liquid level sensor is arranged in the liquid injection valve in the battery pack at the end of water injection. The one-way pressure relief valve and the flow sensor are installed in the return pipeline. The controller can receive the water replenishing signal sent by the main control liquid level sensor to start the pumping motor to replenish water to the storage battery. After the water replenishment of each battery pack is completed, the plurality of liquid injection valves close automatically. The water flows back through the return pipeline and opens the one-way pressure relief valve through the pressure of the water. The return water enters the flow sensor through the one-way pressure relief valve. The controller diagnoses the completion of water replenishment according to the signal fed back by the flow sensor and controls the pumping motor to close; The plurality of liquid injection valves are composed of a plurality of sub-control liquid inlet valves and at least one main control liquid inlet valve. The main control liquid inlet valve is located in the battery pack at the end of water injection, and the main control liquid level sensor is installed in the main control liquid inlet valve; The liquid injection valve includes a control valve body, an inlet tee, a diverter, an extension rod, a movable lever, a stop valve and a float. The diverter is arranged in the accommodating cavity of the control valve body. The inlet tee is buckled and clamped on the control valve body. The lower end of the extension rod is fixedly connected with the float, and the middle section of the extension rod is slidably sleeved at the bottom of the diverter. The water inlet of the inlet tee is communicated with the outlet pipeline, the water outlet of the inlet tee is communicated with the water inlet of the diverter, and the stop valve is slidably arranged at the water outlet of the diverter. The first end of the movable lever is rotatably arranged on the extension rod, and the diverter has a convex fulcrum. The second end of the movable lever is clamped on the stop valve.

2. The automatic water replenishing system for traction lead-acid batteries according to claim 1, wherein The liquid injection valve further includes an upper cover, and the upper cover has a display window. The upper end of the extension rod extends upward to form a color display part, and the color display part is correspondingly arranged with the display window.

3. The automatic water replenishing system for traction lead-acid batteries according to claim 1, characterized in that, The water replenishing device further includes a reducing tee. The water inlet of the reducing tee is communicated with the water tank. The first water outlet of the reducing tee is communicated with the outlet pipeline after passing through the pumping motor. The second water outlet of the reducing tee is communicated with the return pipeline.

4. The automatic water replenishing system for traction lead-acid batteries according to claim 3, wherein It further includes a control unit housing. The circuit board of the controller, the reducing tee, the pumping motor, the one-way pressure relief valve and the flow sensor are all arranged in the control unit housing. And an inlet joint, an outlet joint and a return water joint are arranged on the control unit housing.

5. The automatic water replenishing system for a traction lead-acid battery according to claim 1, characterized in that, The one-way pressure relief valve includes a water inlet housing, a shunt plug, a spring and a water outlet housing. The water inlet housing is clamped with the water outlet housing to form an accommodation cavity. The shunt plug is axially slidably arranged on one side of the accommodation cavity close to the water inlet housing in a sealing manner. The first end of the spring is sleeved and abutted against the shunt plug, and the second end of the spring abuts against the inner wall of the water outlet housing.

6. The automatic water replenishing system for a traction lead-acid battery according to claim 1, characterized in that, The flow sensor includes an upper housing, a lower housing, an impeller and a magnet. The upper housing and the lower housing are respectively provided with a water outlet and a water inlet. The impeller is arranged in a cavity formed between the upper housing and the lower housing; the two magnets are arranged at the upper ends of the blades of the impeller.

7. The automatic water replenishing system for traction lead-acid batteries according to claim 1, characterized in that, The water replenishing device further includes a water inlet three-way joint and a water return three-way joint. The water outlet pipeline includes two parallel water supply branches, and each water supply branch has a plurality of the sub-control liquid inlet valves and a main control liquid inlet valve; the water inlet three-way joint is located at the connection of the water outlet pipeline and the two water supply branches, and the water return three-way joint is located at the connection of the two water supply branches and the water return pipeline.

8. The automatic water replenishing system for traction lead-acid batteries according to claim 1, characterized in that, The main control liquid level sensor is a photoelectric switch.

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