Energy storage liquid injection tooling control circuit

Abstract

The utility model relates to a kind of energy storage liquid injection tool control circuit, power supply is connected with parallel water pump control circuit, water pump starting circuit and operation monitoring circuit after power circuit breaker respectively, the water pump control circuit includes selection switch, pressure switch, thermal relay normally closed switch and alternating current contactor connected in turn, the water pump starting circuit includes alternating current contactor normally open contact, thermal relay and water pump starting contact connected in turn, the operation monitoring circuit includes alternating current contactor normally open switch and operation pilot lamp connected in turn.The circuit can realize hand automatic switching, pressure precision, multiple protection and the state intuitive liquid storage control.

Description

Technical Field

[0001] This utility model relates to a control circuit, specifically a control circuit for an energy storage liquid injection tool. Background Technology

[0002] As the global energy structure shifts towards clean energy, the installed capacity of energy storage systems, such as electrochemical energy storage and integrated photovoltaic-energy storage systems, is growing rapidly, making temperature control during operation increasingly critical. Liquid cooling technology, due to its high heat dissipation efficiency and good temperature uniformity, has become the mainstream temperature control solution for medium and large-scale energy storage systems. The core of a liquid cooling system lies in the stable injection and pressure maintenance of the water system—the consistency of the injection pressure directly affects the flow efficiency of the heat dissipation circuit. If the injection pressure is too low, it will lead to incomplete venting and insufficient local heat dissipation; if the pressure is too high, it may cause risks such as pipe leaks and damage to seals.

[0003] Currently, water system injection operations at energy storage sites largely rely on manual control of water pumps by operators, lacking an automated pressure feedback mechanism. Differences in operating habits among different personnel, such as start / stop timing and pressure judgment standards, can easily lead to significant deviations in injection pressure within the same batch of systems. Some systems may require rework due to substandard pressure, reducing production efficiency. Furthermore, on-site operators must constantly monitor pressure gauges and manually switch water pump statuses, especially in scenarios involving multiple venting and refilling operations. This cumbersome process is prone to human error, leading to pressure exceeding limits. Additionally, injection pressures exceeding the system's tolerance threshold can cause pipeline ruptures, equipment failures, and increased costs. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a control circuit for an energy storage liquid injection fixture that enables manual / automatic switching, precise pressure control, multiple protections, and intuitive status display.

[0005] The technical solution adopted by this utility model is: a control circuit for an energy storage liquid injection fixture, including a power supply and a power circuit breaker, characterized in that: the power supply is connected in parallel to a water pump control circuit, a water pump start circuit, and an operation monitoring circuit after passing through the power circuit breaker; the water pump control circuit includes a selector switch, a pressure switch, a normally closed thermal relay switch, and an AC contactor connected in series; the water pump start circuit includes a normally open AC contactor contactor contactor, a thermal relay, and a water pump start contactor connected in series; and the operation monitoring circuit includes a normally open AC contactor switch and an operation indicator light connected in series.

[0006] The power supply is AC 220V or 380V.

[0007] A pressure switch and a normally closed thermal relay switch are sequentially installed on the automatic gear position circuit of the selector switch.

[0008] The manual gear circuit of the selector switch is directly connected to the AC contactor and the automatic gear circuit is connected in parallel.

[0009] A power-on circuit is connected in parallel after the power circuit breaker, and a power-on indicator light is installed on the power-on circuit.

[0010] The power circuit breaker is an air switch.

[0011] The beneficial effects of this utility model are as follows: 1. Achieve consistent injection pressure control and improve system stability. In automatic switch mode, precise threshold control via the pressure switch allows for accurate control of injection pressure deviations, avoiding pressure fluctuations caused by human error. This ensures uniform pressure in the heat dissipation circuit of the energy storage liquid cooling system, reduces rework due to substandard pressure, and improves injection efficiency.

[0012] 2. Flexible switching between manual and automatic modes to adapt to various scenarios. The dual-mode design of the selector switch, with manual and automatic settings, not only meets the needs of automated fluid injection in normal scenarios, but also addresses the mandatory fluid injection requirements in special scenarios such as system venting and replenishment, and pipeline cleaning, avoiding operational limitations caused by a single mode.

[0013] 3. Multiple safety protections reduce equipment failure risks. The system integrates a triple protection mechanism: air switch short-circuit protection, thermal relay overload protection, and pressure switch overpressure protection. This covers core fault scenarios such as power abnormalities, water pump overload, and excessive pressure. The overload protection response can quickly cut off the water pump power supply to prevent motor burnout; the pressure switch's threshold accuracy can precisely match the pressure requirements of different specifications of energy storage liquid cooling systems, reducing the risk of pipeline leakage.

[0014] 4. Visualized status monitoring simplifies operation. With dual indications from the power-on indicator and the running indicator, operators can quickly determine the working status of the tooling without having to inspect the pressure gauge or water pump at close range. This is especially suitable for managing multi-station synchronous liquid injection scenarios, reducing operational intensity. Attached Figure Description

[0015] Figure 1 This is the circuit diagram of this utility model.

[0016] In the diagram: Power supply 1, air switch QF, power-on indicator HL1, water pump indicator HL2, AC contactor KM, AC contactor normally open contact KM-1, AC contactor normally open switch KM-2, thermal relay FR, thermal relay normally closed switch FR-1, selector switch SA, manual gear position circuit SA-1, automatic gear position circuit SA-2, pressure switch HP, water pump M1. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Figure 1 As shown: A control circuit for an energy storage liquid injection fixture includes a power supply 1 and an air switch QF. The power supply 1, via the air switch QF, is connected in parallel to a water pump control circuit, a water pump start-up circuit, a power-on circuit, and a running monitoring circuit. The power-on circuit is equipped with a power-on indicator light HL1. The water pump control circuit includes a selector switch SA, a pressure switch HP, a normally closed thermal relay switch FR-1, and an AC contactor KM. The manual gear position circuit SA-1 of the selector switch SA is directly connected to the AC contactor KM. The manual gear position circuit SA-1 is connected in parallel with the automatic gear position circuit SA-2. The normally closed thermal relay switch FR-1 and the pressure switch HP are connected in series on the automatic gear position circuit SA-2. The water pump start-up circuit includes the normally open AC contactor contactor KM-1, the thermal relay FR, and the water pump M1 start contact connected in series. The running monitoring circuit includes the normally open AC contactor switch KM-2 and the running indicator light HL2 connected in series.

[0019] In this embodiment, the power supply is an AC 220V or 380V power supply.

[0020] The control process of this circuit revolves around five stages: "power-on initialization - mode selection - liquid injection execution - fault protection - stop". The specific process is as follows: 1. Power-on initialization phase: Close the air switch QF, and the power supply is input to the circuit through QF; the power-on circuit is turned on, the power-on indicator light HL1 lights up, indicating that the power supply has been connected normally, and the circuit enters the standby state; at this time, the water pump control circuit, water pump start circuit, and operation monitoring circuit are all in the disconnected state, the water pump M1 is not started, and the operation indicator light HL2 is off.

[0021] 2. Manual mode control process (applicable to special scenarios such as refilling and venting): Switch the selector switch SA to the manual mode circuit; Current path: Power supply → QF → SA (manual mode) → KM coil → Power supply, the KM coil is energized and closes; the normally open contact of KM closes, the water pump starting circuit is turned on, current → QF → KM normally open contact → FR → M1, the water pump M1 starts running; When the KM normally open switch closes synchronously, the operation monitoring circuit is activated, the operation indicator light HL2 illuminates, indicating that the water pump has entered manual operation mode; Stop control: When SA is switched to the stop position, the KM coil is de-energized, the contacts and switch are open, M1 stops running, and HL2 is turned off.

[0022] 3. Automatic Mode Control Flow (Applicable to Regular Consistent Injection Scenarios): Switch the selector switch SA to the automatic mode circuit; initially, the pressure switch HP is closed. If the thermal relay FR is not overloaded (normally closed contact remains closed), the current path is: power supply → QF → SA (automatic mode) → FR normally closed switch (closed) → pressure switch HP (closed) → KM coil → power supply, and the KM coil is energized and engaged; water pump start and status feedback: the KM normally open contact closes, and M1 starts injection; simultaneously, the KM normally open switch closes, and HL2 lights up, indicating that automatic injection has started; pressure threshold stop: as injection proceeds, the water system pressure gradually increases. When the pressure reaches the preset qualified threshold of the pressure switch HP, the pressure switch HP opens, and the KM coil is de-energized; circuit reset: the KM normally open contact opens, and M1 stops injection; the KM normally open switch opens, HL2 goes out, and the automatic injection process is completed; secondary injection trigger: if the system pressure drops to the pressure switch HP after venting... The loop control automatically closes when the threshold is below, and the repeated steps are automatically restarted.

Claims

1. An energy storage liquid injection tool control circuit, comprising a power supply and a power supply breaker, characterized in that: The power supply is connected in parallel to a water pump control circuit, a water pump start-up circuit, and an operation monitoring circuit after passing through a power circuit breaker. The water pump control circuit includes a selector switch, a pressure switch, a normally closed thermal relay switch, and an AC contactor connected in series. The water pump start-up circuit includes a normally open AC contactor contactor contactor, a thermal relay, and a water pump start contactor connected in series. The operation monitoring circuit includes a normally open AC contactor switch and an operation indicator light connected in series.

2. The control circuit for an energy storage liquid injection fixture according to claim 1, characterized in that: The power supply is AC 220V or 380V.

3. The energy storage liquid injection tool control circuit of claim 1, wherein: A pressure switch and a normally closed thermal relay switch are sequentially installed on the automatic gear position circuit of the selector switch.

4. The energy storage liquid injection tool control circuit of claim 1, wherein: The manual gear circuit of the selector switch is directly connected to the AC contactor and the automatic gear circuit is connected in parallel.

5. The energy storage liquid injection tool control circuit according to claim 1, characterized in that: A power-on circuit is connected in parallel after the power circuit breaker, and a power-on indicator light is installed on the power-on circuit.

6. The energy storage liquid injection tool control circuit according to claim 1, characterized in that: The power circuit breaker is an air switch.

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