A portable residual charge discharge protection device for flow battery stacks before maintenance

Abstract

The application relates to the technical field of battery stack discharge protection, in particular to a portable residual charge discharge protection device for liquid flow battery stack maintenance, which comprises an equipment seat, a equipment rack is fixedly connected in the middle of the equipment seat, electrolyte bottles are placed on the two sides of the equipment rack, a stack limiting assembly is arranged in the middle of the equipment rack, a stack is arranged in the stack limiting assembly, a transmission mechanism is fixedly connected to the inner wall of the middle of the equipment rack, a lifting seat is arranged above the transmission mechanism, a reciprocating seat is slidably arranged on the lifting seat, a connecting mechanism is fixedly connected to the reciprocating seat, a heat dissipation mechanism is arranged on one side of the transmission mechanism, the transmission mechanism, the lifting seat and the reciprocating seat can drive the stack to shake, the quick vibration can effectively increase the flow and mixing of the electrolyte, help the unreacted electrolyte to fully activate and participate in the reaction, thereby accelerating the completion of the discharge process, and making the battery reach the safe state more quickly.

Description

Technical Field

[0001] This invention relates to the field of battery stack discharge protection technology, and in particular to a portable residual charge discharge protection device for flow battery stacks before maintenance. Background Technology

[0002] Flow batteries primarily rely on the chemical reactions of the electrolyte circulating within the stack to achieve charging and discharging. However, during experiments, leaks or other unexpected situations may occur, necessitating the cessation of circulation and disassembly of the stack for repair. Often, the charging and discharging process is not fully completed. Furthermore, under large-size single-cell conditions, factors such as the large reaction area, uneven flow field distribution, and insufficient electrolyte circulation can also lead to incomplete electrolyte reactions within the stack. In such cases, the graphite felt inside the stack becomes filled with a large amount of unreacted electrolyte, resulting in residual electrochemical energy within the single cell. During disassembly, accidental contact with the positive and negative electrodes may pose a safety hazard, and irreversible damage may be caused to critical components such as the ion exchange membrane and electrode graphite felt, severely impacting the battery's subsequent performance and lifespan. In summary, there is an urgent need for a portable residual charge discharge protection device for flow battery stacks before maintenance that is simple in structure, easy to operate, and adaptable to single flow battery cells of different specifications. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing a portable residual charge discharge protection device for flow battery stacks before maintenance.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a portable residual charge discharge protection device for flow battery stacks before maintenance, comprising a device base, a device frame fixedly connected to the middle of the device base, electrolyte bottles placed on both sides of the device frame, a stack limiting component disposed in the middle of the device frame, a stack disposed within the stack limiting component, a transmission mechanism fixedly connected to the inner wall of the middle of the device frame, a lifting seat disposed above the transmission mechanism, a reciprocating seat slidably disposed on the lifting seat, a connecting mechanism fixedly connected to the reciprocating seat, and a heat dissipation mechanism disposed on one side of the transmission mechanism.

[0005] Preferably, the fuel cell stack limiting assembly includes two limiting plates connected by bolts, and the bottom end of the limiting plate is provided with a plug hole.

[0006] Preferably, the transmission mechanism includes a motor, which is fixedly connected to the inner wall of the middle part of the equipment frame. A bent rod is fixedly connected to the output end of the motor, and a drive wheel is fixedly connected to the other end of the bent rod.

[0007] Preferably, guide rods are slidably fitted through both sides of the lifting seat, and the two ends of the guide rods are fixedly connected to the inner wall of the middle part of the equipment frame. A sliding frame is fixedly connected to the bottom of the lifting seat, and the inner wall of the sliding frame is slidably fitted to the bend of the bending rod. Two sliding grooves are symmetrically opened at the top of the lifting seat. A transmission rod is fixedly connected to the end of the lifting seat near the heat dissipation mechanism, and the top of the transmission rod is slidably fitted through the inner wall of the middle part of the equipment frame. A connecting rod is rotatably connected to the top of the transmission rod.

[0008] Preferably, the bottom of the reciprocating seat is symmetrically connected with two slide bars, which are slidably engaged with the inner wall of the slide groove. A roller is rotatably connected to one side of the reciprocating seat, and a slant frame is slidably engaged with the outer wall of the roller. The top of the slant frame is fixedly connected to the inner wall of the middle part of the equipment frame.

[0009] Preferably, the connecting mechanism includes a second motor, which is fixedly connected to the reciprocating seat. A worm gear is fixedly connected to the output end of the second motor, and worm wheel shafts are meshed and driven on both sides of the worm gear. The bottom end of the worm wheel shaft is rotatably connected to the reciprocating seat.

[0010] Preferably, the top end of the worm gear shaft extends through the inner wall of the equipment frame to the outside and is fixedly connected to an adjusting rod. The other end of the adjusting rod is fixedly connected to a plug rod, which is movably plugged into a plug hole.

[0011] Preferably, the heat dissipation mechanism includes an air duct, both ends of which are fixedly connected to the inner wall of the equipment frame. A universal joint is rotatably connected to the bottom inner wall of the air duct. A fan blade is fixedly connected to the inner end of the universal joint. An electric actuator is fixedly connected to the outer end of the universal joint. A driven wheel is fixedly connected to the output end of the electric actuator. The driven wheel is meshed with the driving wheel for transmission.

[0012] Preferably, a jet head is rotatably connected to one side of the top end of the air guide pipe, the air inlet end of the jet head is fixedly connected to the top end of the air guide pipe via a hose, and one side of the bottom end of the jet head is rotatably connected to the other end of the connecting rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Through the transmission mechanism, lifting seat, and reciprocating seat, after the battery stack limiting component with the fixed battery stack is placed on the connecting mechanism, it can drive the battery stack limiting component on the connecting mechanism to vibrate rapidly up and down and back and forth. This enables the battery stack to follow the vibration. The rapid vibration can effectively increase the flow and mixing of electrolyte, help unreacted electrolyte to be fully activated and participate in the reaction, thereby accelerating the completion of the discharge process, allowing the battery to reach a safe state more quickly, avoiding local charge residue caused by uneven flow, and ensuring a more thorough discharge process. This not only improves the discharge efficiency and safety of the flow battery stack, but also provides a more convenient user experience for the maintenance process. By setting an adjustable connection mechanism, the angle between the two adjusting rods can be adjusted to insert the battery stack limiting components with different thicknesses, making the device adaptable to batteries of various specifications and models, improving the equipment's versatility and adaptability, greatly reducing equipment limitations caused by changes in battery size, and making the maintenance process of flow battery stacks not only more flexible and adaptable, but also improving safety, efficiency and ease of operation. By incorporating a heat dissipation mechanism, when the discharge stack overheats, the transmission mechanism drives the stack to vibrate while simultaneously blowing air onto it to dissipate heat. This prevents the electrolyte from precipitating due to localized overheating and avoids irreversible damage to the ion exchange membrane and graphite felt due to high temperatures, significantly extending the subsequent service life of the stack. Simultaneously, it prevents problems such as decreased discharge efficiency and device damage caused by overheating. This achieves a synergistic effect between heat dissipation and vibration, completely solving the pain point of stack overheating during discharge and further highlighting the device's core advantages of "simple structure, convenient operation, strong adaptability, and safety and reliability." Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a portable flow battery stack residual charge discharge protection device before maintenance according to the present invention; Figure 2 This is a partial cross-sectional view of a portable flow battery stack residual charge discharge protection device before maintenance, according to the present invention. Figure 3 This is a schematic diagram of the stack limiting component structure of a portable flow battery stack residual charge discharge protection device before maintenance, according to the present invention. Figure 4 This is a schematic diagram of the transmission mechanism of a portable flow battery stack residual charge discharge protection device before maintenance, according to the present invention. Figure 5 This is a schematic diagram of the lifting base structure of a portable flow battery stack residual charge discharge protection device before maintenance according to the present invention; Figure 6This is a schematic diagram of the reciprocating seat structure of a portable flow battery stack residual charge discharge protection device before maintenance according to the present invention; Figure 7 This is a schematic diagram of the connection mechanism of a portable flow battery stack residual charge discharge protection device before maintenance, according to the present invention. Figure 8 This is a partial cross-sectional schematic diagram of the heat dissipation mechanism of a portable flow battery stack residual charge discharge protection device before maintenance, according to the present invention.

[0015] The diagram shows: 1. Equipment base; 2. Equipment frame; 3. Electrolyte bottle; 4. Battery stack limiting assembly; 5. Battery stack; 6. Transmission mechanism; 7. Lifting seat; 8. Reciprocating seat; 9. Connecting mechanism; 10. Heat dissipation mechanism; 401. Limiting plate; 402. Insertion hole; 601. Motor 1; 602. Bending rod; 603. Drive wheel; 701. Guide rod; 702. Sliding frame; 703. Sliding groove; 7 04. Transmission rod; 705. Connecting rod; 801. Sliding bar; 802. Roller; 803. Inclined slot frame; 901. Motor II; 902. Worm gear; 903. Worm wheel shaft; 904. Adjusting rod; 905. Connecting rod; 1001. Air guide pipe; 1002. Universal joint; 1003. Fan blade; 1004. Electric actuator; 1005. Driven wheel; 1006. Jet nozzle; 1007. Hose. Detailed Implementation

[0016] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0017] like Figures 1-8 The portable residual charge discharge protection device for a flow battery stack before maintenance, shown, includes a base 1, a frame 2 fixedly connected to the middle of the base 1, electrolyte bottles 3 placed on both sides of the frame 2, a stack limiting component 4 in the middle of the frame 2, a stack 5 inside the stack limiting component 4, a transmission mechanism 6 fixedly connected to the inner wall of the middle of the frame 2, a lifting seat 7 above the transmission mechanism 6, a reciprocating seat 8 slidably fitted on the lifting seat 7, a connecting mechanism 9 fixedly connected to the reciprocating seat 8, and a heat dissipation mechanism 10 on one side of the transmission mechanism 6.

[0018] The electrolyte bottle 3 is made of corrosion-resistant transparent material, which makes it easy to observe the remaining amount and state of the electrolyte. The bottle mouth is equipped with a sealing connector, which can be precisely connected to the electrolyte inlet and outlet of the fuel cell stack 5 to ensure smooth and leak-free electrolyte delivery.

[0019] like Figure 3As shown, the fuel cell stack limiting assembly 4 includes two limiting plates 401, which are connected by bolts. The bottom end of the limiting plate 401 is provided with a plug hole 402.

[0020] Two limiting plates 401 are symmetrically arranged, and each has a flexible protective pad on its inner wall. The flexible protective pad is made of wear-resistant and corrosion-resistant material, which can fit tightly against the outer shell of the fuel cell stack 5. This ensures that the fuel cell stack 5 is firmly fixed and avoids damage caused by friction between the limiting plates 401 and the outer shell of the fuel cell stack 5. It can also buffer the impact force when the fuel cell stack 5 shakes. The bolt connection method allows for quick adjustment of the distance between the two limiting plates 401 to accommodate fuel cell stacks of different thicknesses.

[0021] like Figure 4 As shown, the transmission mechanism 6 includes a motor 601, which is fixedly connected to the inner wall of the middle part of the equipment frame 2. A bent rod 602 is fixedly connected to the output end of the motor 601, and a drive wheel 603 is fixedly connected to the other end of the bent rod 602.

[0022] The bending rod 602 is made of carbon steel and can drive the sliding frame 702 to slide up and down and the drive wheel 603 to rotate simultaneously under the drive of the motor 601, so as to realize the synchronous distribution of transmission power. No additional power mechanism is required, which simplifies the equipment structure.

[0023] like Figure 5 As shown, guide rods 701 are slidably fitted through both sides of the lifting seat 7. The two ends of the guide rods 701 are fixedly connected to the inner wall of the middle part of the equipment frame 2. A sliding frame 702 is fixedly connected to the bottom of the lifting seat 7. The inner wall of the sliding frame 702 is slidably fitted to the bend of the bent rod 602. Two sliding grooves 703 are symmetrically opened at the top of the lifting seat 7. A transmission rod 704 is fixedly connected to the end of the lifting seat 7 near the heat dissipation mechanism 10. The top of the transmission rod 704 is slidably fitted through the inner wall of the middle part of the equipment frame 2. A connecting rod 705 is rotatably connected to the top of the transmission rod 704.

[0024] The guide rod 701 is made of stainless steel with a smooth polished surface. It slides tightly with the through hole of the lifting seat 7, with low sliding resistance and no jamming. The transmission rod 704 is welded and fixed to the lifting seat 7, with a firm connection. It can move up and down synchronously with the lifting seat 7. The top of the transmission rod 704 is rotatably connected to the connecting rod 705, which can convert the up and down movement of the lifting seat 7 into the swing of the connecting rod 705, thereby driving the angle adjustment of the jet head 1006 of the heat dissipation mechanism 10, realizing flexible adjustment of the heat dissipation range.

[0025] like Figure 6As shown, the bottom of the reciprocating seat 8 is symmetrically connected with two slide bars 801. The slide bars 801 are slidably engaged with the inner wall of the slide groove 703. A roller 802 is rotatably connected to one side of the reciprocating seat 8. A slant frame 803 is slidably engaged with the outer wall of the roller 802. The top of the slant frame 803 is fixedly connected to the inner wall of the middle part of the equipment frame 2.

[0026] The slide bar 801 is made of carbon steel, which is rigid and not easily deformed. The surface of the slide bar 801 is smooth, and it slides smoothly with the inner wall of the slide groove 703. The roller 802 is made of wear-resistant rubber, which rotates smoothly without jamming. The outer wall of the roller 802 fits tightly with the inner wall of the inclined groove of the inclined frame 803, and the sliding resistance is small. When the lifting seat 7 moves up and down, it drives the reciprocating seat 8 to move up and down synchronously. At this time, the roller 802 slides along the inclined groove of the inclined frame 803. Due to the guiding effect of the inclined groove, it can drive the reciprocating seat 8 to slide back and forth along the slide groove 703, thereby realizing the back and forth shaking of the fuel cell stack 5. Combined with the up and down shaking of the lifting seat 7, it forms a three-dimensional shaking effect, which further accelerates the flow and mixing of electrolyte and improves the discharge efficiency.

[0027] Through the transmission mechanism 6, lifting seat 7, and reciprocating seat 8, after the stack limiting component 4, on which the stack 5 is fixed, is placed on the connecting mechanism 9, during the residual charge discharge protection step before maintenance of the flow battery stack 5, the stack limiting component 4 on the connecting mechanism 9 can be driven to vibrate rapidly up and down and back and forth. This allows the stack 5 to follow the vibration. The rapid vibration can effectively increase the flow and mixing of the electrolyte, helping unreacted electrolyte to be fully activated and participate in the reaction, thereby accelerating the completion of the discharge process. This allows the battery to reach a safe state more quickly, avoids local residual charge caused by uneven flow, and ensures a more thorough discharge process. This not only improves the discharge efficiency and safety of the flow battery stack 5, but also provides a more convenient user experience for the maintenance process.

[0028] like Figure 7 As shown, the connecting mechanism 9 includes a second motor 901, which is fixedly connected to the reciprocating seat 8. A worm gear 902 is fixedly connected to the output end of the second motor 901. Worm gear shafts 903 are meshed and driven on both sides of the worm gear 902. The bottom end of the worm gear shaft 903 is rotatably connected to the reciprocating seat 8.

[0029] The top end of the worm gear shaft 903 extends through the inner wall of the equipment frame 2 to the outside and is fixedly connected to an adjusting rod 904. The other end of the adjusting rod 904 is fixedly connected to a plug rod 905, which is movably plugged into the plug hole 402.

[0030] Motor 2 901 adopts a miniature precision motor with accurate speed and stable operation. The adjusting rod 904 is made of carbon steel and is welded and fixed to the worm gear shaft 903, with a firm connection. It can rotate synchronously with the worm gear shaft 903. The length of the adjusting rod 904 is adapted to the width of the fuel cell stack limit assembly 4. The plug rod 905 is made of stainless steel with rounded corners at the top, which facilitates quick insertion into the plug hole 402, greatly improving the equipment's versatility and adaptability and simplifying the operation process.

[0031] like Figure 8 As shown, the heat dissipation mechanism 10 includes an air guide pipe 1001. Both ends of the air guide pipe 1001 are fixedly connected to the inner wall of the equipment frame 2. A universal joint 1002 is rotatably connected to the inner wall of the bottom end of the air guide pipe 1001. A fan blade 1003 is fixedly connected to the inner end of the universal joint 1002. An electric actuator 1004 is fixedly connected to the outer end of the universal joint 1002. A driven wheel 1005 is fixedly connected to the output end of the electric actuator 1004. The driven wheel 1005 is meshed with the driving wheel 603 for transmission.

[0032] The electric actuator 1004 is a miniature precision electric actuator with high telescopic accuracy. It can flexibly adjust the position of the driven wheel 1005 to realize the engagement and disengagement of the driven wheel 1005 and the driving wheel 603. When the fuel cell stack 5 does not need heat dissipation, the electric actuator 1004 can retract to drive the driven wheel 1005 to separate from the driving wheel 603, stop the operation of the heat dissipation mechanism 10, and save energy.

[0033] A jet head 1006 is rotatably connected to one side of the top end of the air duct 1001. The air inlet end of the jet head 1006 is fixedly connected to the top end of the air duct 1001 via a hose 1007. The bottom end of the jet head 1006 is rotatably connected to the other end of the connecting rod 705.

[0034] The jet head 1006 adopts a rotatable structure and has a trumpet-shaped design, which can expand the heat dissipation range and ensure that the cold air can evenly cover the surface of the fuel cell stack 5, thereby improving the heat dissipation effect. The hose 1007 is a flexible and wear-resistant hose with good flexibility and corrosion resistance, which can be adapted to the angle adjustment of the jet head 1006.

[0035] Working principle: First, place the electrolyte bottle 3 on both sides of the equipment rack 2, ensuring it is firmly placed. Connect the outlet of the electrolyte bottle 3 to the electrolyte inlet and outlet of the fuel cell stack 5 through pipes, ensuring a sealed and leak-free connection. Adjust the spacing of the fuel cell stack limiting components 4 according to the thickness of the fuel cell stack 5 to be repaired. Attach the two limiting plates 401 to both sides of the fuel cell stack 5 respectively, and tighten them with bolts to ensure the fuel cell stack 5 is firmly fixed. The flexible protective pads on the inner walls of the limiting plates 401 fit tightly against the outer shell of the fuel cell stack 5 to prevent damage to the fuel cell stack 5. Then, activate the connecting mechanism 9. Motor 2 901 drives worm 902 to rotate. Worm 902 meshes with worm wheel shafts 903 on both sides, driving the two worm wheel shafts 903 to rotate synchronously in opposite directions. This, in turn, drives adjusting rod 904 to open or close, adjusting the distance between the two plug rods 905 so that the plug rods 905 are precisely aligned with the plug holes 402 at the bottom of the limiting plate 401. The fuel cell stack limiting assembly 4, on which the fuel cell stack 5 is fixed, is placed above the connecting mechanism 9, so that the plug rods 905 are inserted into the plug holes 402, thus completing the fixing of the fuel cell stack 5.

[0036] Then, the motor 601 of the transmission mechanism 6 is started. The motor drives the bending rod 602 to rotate. The bending part of the bending rod 602 slides and engages with the slide frame 702, causing the lifting seat 7 to slide up and down along the guide rod 701, thus realizing the up and down shaking of the fuel cell stack 5. At the same time, when the lifting seat 7 moves up and down, the slide bar 801 at the bottom of the reciprocating seat 8 slides along the slide groove 703, and the roller 802 on one side of the reciprocating seat 8 slides along the inclined groove of the inclined frame 803, causing the reciprocating seat 8 to slide back and forth, thereby causing the fuel cell stack 5 to shake back and forth. The up and down shaking and the back and forth shaking work together to form a three-dimensional shaking effect, which accelerates the flow and mixing of the electrolyte inside the fuel cell stack 5, promotes the full participation of unreacted electrolyte in the reaction, and accelerates the discharge speed of residual charge. Meanwhile, the bending rod 602 drives the drive wheel 603 to rotate. The drive wheel 603 meshes with the driven wheel 1005, driving the electric push rod 1004, universal joint 1002 and fan blade 1003 to rotate synchronously. The fan blade 1003 rotates to draw in external cold air, which is then delivered to the jet head 1006 through the air guide pipe 1001 and hose 1007. The jet head 1006 rotates back and forth under the drive of the connecting rod 705, spraying cold air evenly onto the surface of the fuel cell stack 5 to achieve synchronous heat dissipation and prevent the fuel cell stack 5 from overheating. According to the amount of residual charge in the fuel cell stack 5, the speed of the motor 601 is adjusted to adjust the vibration frequency, ensuring complete discharge and high efficiency.

[0037] Then, given the unique characteristics of flow battery discharge, as long as it is a single-cell stack, regardless of its area, the discharge voltage is between 0.8V and 1.7V. Therefore, by simply measuring the voltage, one can determine the state of charge (SOC) of the battery at that time. The reaction area of ​​a single cell determines its discharge current. For example, a 50mm*50mm single cell, when measured in a non-flowing state, has a current of 601.5mA at 1.546V and a current of 577.2mA at 1.318V. Therefore, the discharge current is related to the battery voltage and reaction area, and may reach several amperes, or even tens or twenty amperes.

[0038] The discharge process is as follows: Discharge circuit: Battery positive terminal → electrode clamp → wire → emergency stop button → normally open relay terminal → multi-position resistor group → shunt (voltage) converter → ammeter (voltage) meter → electrode clamp → battery negative terminal (forming a closed circuit).

[0039] Control circuit: External 5V DC power supply → power switch → ammeter power supply terminal → alarm module → cooling fan → temperature sensor → relay coil → power supply negative terminal.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A portable residual charge discharge protection device for flow battery stacks before maintenance, comprising a device base (1), characterized in that: An equipment frame (2) is fixedly connected to the middle of the equipment base (1). Electrolyte bottles (3) are placed on both sides of the equipment frame (2). A battery stack limiting component (4) is set in the middle of the equipment frame (2). A battery stack (5) is set inside the battery stack limiting component (4). A transmission mechanism (6) is fixedly connected to the inner wall of the middle of the equipment frame (2). A lifting seat (7) is set above the transmission mechanism (6). A reciprocating seat (8) is slidably fitted on the lifting seat (7). A connecting mechanism (9) is fixedly connected to the reciprocating seat (8). A heat dissipation mechanism (10) is set on one side of the transmission mechanism (6). The transmission mechanism (6) includes a motor. (601), the motor (601) is fixedly connected to the inner wall of the middle part of the equipment frame (2), the output end of the motor (601) is fixedly connected to a bent rod (602), the other end of the bent rod (602) is fixedly connected to a drive wheel (603), both sides of the lifting seat (7) are slidably connected to guide rods (701), both ends of the guide rods (701) are fixedly connected to the inner wall of the middle part of the equipment frame (2), the bottom end of the lifting seat (7) is fixedly connected to a sliding frame (702), the inner wall of the sliding frame (702) is slidably connected to the bent part of the bent rod (602), and the top of the lifting seat (7) is symmetrically structured. There are two slid grooves (703). The bottom of the reciprocating seat (8) is symmetrically connected with two slide bars (801). The slide bars (801) are slidably engaged with the inner wall of the slid groove (703). A roller (802) is rotatably connected to one side of the reciprocating seat (8). A slant frame (803) is slidably engaged with the outer wall of the roller (802). The top of the slant frame (803) is fixedly connected to the inner wall of the middle part of the equipment frame (2). The fuel cell stack limiting assembly (4) includes two limiting plates (401). The two limiting plates (401) are connected by bolts. The bottom end of the limiting plate (401) is provided with a plug hole (402). The connecting mechanism (9) includes a second motor (901), which is fixedly connected to the reciprocating seat (8). A worm gear (902) is fixedly connected to the output end of the second motor (901). Worm gear shafts (903) are meshed and driven on both sides of the worm gear (902). The bottom end of the worm gear shaft (903) is rotatably connected to the reciprocating seat (8). The top end of the worm gear shaft (903) extends through the inner wall of the equipment frame (2) to the outside and is fixedly connected to an adjusting rod (904). The other end of the adjusting rod (904) is fixedly connected to a plug rod (905). The plug rod (905) is movably plugged into the plug hole (402).

2. The portable residual charge discharge protection device for flow battery stacks before maintenance according to claim 1, characterized in that: The lifting seat (7) is fixedly connected to a transmission rod (704) at one end near the heat dissipation mechanism (10). The top end of the transmission rod (704) is slidably connected to the inner wall of the middle part of the equipment frame (2). The top end of the transmission rod (704) is rotatably connected to a connecting rod (705).

3. The portable residual charge discharge protection device for flow battery stacks before maintenance according to claim 2, characterized in that: The heat dissipation mechanism (10) includes an air guide pipe (1001), both ends of which are fixedly connected to the inner wall of the equipment frame (2). A universal joint (1002) is rotatably connected to the inner wall of the bottom end of the air guide pipe (1001). A fan blade (1003) is fixedly connected to the inner end of the universal joint (1002). An electric actuator (1004) is fixedly connected to the outer end of the universal joint (1002). A driven wheel (1005) is fixedly connected to the output end of the electric actuator (1004). The driven wheel (1005) is meshed with the driving wheel (603) for transmission.

4. The portable residual charge discharge protection device for flow battery stacks before maintenance according to claim 3, characterized in that: A jet head (1006) is rotatably connected to one side of the top end of the air duct (1001). The air inlet end of the jet head (1006) is fixedly connected to the top end of the air duct (1001) through a hose (1007). The bottom end of the jet head (1006) is rotatably connected to the other end of the connecting rod (705).

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