Liquid cooling system capable of being used for cooling power distribution cabinet of battery compartment

Abstract

The invention relates to a liquid cooling system for cooling a battery compartment power distribution cabinet, and belongs to the field of energy storage. According to the system, a power distribution room cooling branch is connected with a PCS cooling branch and an energy storage battery bin cooling branch in parallel, a deionization unit is connected with a cooling unit in parallel, and when a power distribution room is in a high-voltage state, switch valves of the power distribution room cooling branch, the PCS cooling branch and the energy storage battery bin cooling branch are opened; the refrigeration cycles of the power distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are all started, the deionization unit is put into the circulation loop, the cooling water conductivity of the circulation loop is controlled, and the operation requirement of high-power power electronic equipment is met; and when the distribution room is in a low-voltage state, switching valves of the PCS cooling branch and the energy storage battery compartment cooling branch are closed, and an ion unit is removed, so that the liquid cooling system works in a low-power-consumption state, and cooling capacity is only provided for natural heat dissipation equipment of the distribution room. The problem that in the prior art, the refrigeration requirements of the power distribution room in different working states cannot be met is solved.

Description

Technical Field

[0001] The invention relates to a liquid cooling system that can be used for cooling a battery compartment power distribution cabinet, and belongs to the field of energy storage. Background Art

[0002] The power distribution room in the energy storage cabin is used to supply power to the liquid cooling system, fire protection system and other auxiliary equipment. Depending on whether high-power power electronic equipment is used, the power distribution room is divided into high-voltage working state and low-voltage working state. In order to ensure the safe and stable operation of the indoor power distribution circuit, an external industrial air conditioner is installed outside the power distribution room to make the indoor equipment work in a suitable temperature and humidity environment. However, the noise and energy consumption problems during the operation of industrial air conditioners have caused continuous troubles to customers, especially under the premise that society has higher and higher requirements on environmental indicators such as energy consumption and noise of equipment, the cooling method of the power distribution room needs to be further optimized.

[0003] The Chinese patent application publication document with publication number CN116683086A discloses a centralized liquid cooling system for energy storage batteries, including a refrigeration cycle pipeline, a cooling cycle pipeline and a valve pipeline unit, wherein the valve pipeline unit includes several energy storage battery compartment cooling and PCS cooling branches. The energy storage system realizes centralized liquid cooling, wherein the PCS and the energy storage battery compartment have basically the same cooling requirements, therefore, the system can provide a good cold source for multiple cooled devices.

[0004] However, as a very important equipment, the distribution cabinet has a higher demand for cooling compared with PCS and energy storage batteries, and is divided into different working states. Therefore, the existing refrigeration system cannot meet the cooling needs of different working states of the distribution room. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid cooling system that can be used for cooling a battery compartment distribution cabinet, so as to solve the problem that the prior art cannot meet the refrigeration requirements of the distribution room under different working conditions.

[0006] To achieve the above object, the solution of the present invention includes: A liquid cooling system that can be used for cooling a battery compartment distribution cabinet of the present invention comprises a refrigeration unit and a cooling unit, the refrigeration unit provides cooling energy for the cooling unit, the cooling unit is connected in series with a valve pipeline unit, the valve pipeline unit comprises a PCS cooling branch and an energy storage battery compartment cooling branch connected in parallel, the valve pipeline unit also comprises a deionization unit connected in parallel with the cooling unit and a distribution room cooling branch connected in parallel with the PCS cooling branch and the energy storage battery compartment cooling branch, when the distribution room is in a high pressure state, the refrigeration cycles of the distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are all turned on, and the deionization unit is put into the refrigeration cycle; when the distribution room is in a low pressure state, the refrigeration cycle of the distribution room cooling branch is turned on, the refrigeration cycles of the PCS cooling branch and the energy storage battery compartment cooling branch are all turned off, and the deionization unit is removed from the refrigeration cycle.

[0007] Furthermore, when the power distribution room cooling branch, PCS cooling branch and energy storage battery compartment cooling branch are connected in parallel, the PCS cooling branch and the energy storage battery cooling branch are connected in parallel at the rear end of the power distribution room cooling branch, and the total liquid inlet of the PCS cooling branch and the energy storage battery compartment cooling branch is provided with a first switch valve, and the refrigeration cycle of the PCS cooling branch and the energy storage battery compartment cooling branch is turned on and off by controlling the first switch valve.

[0008] Furthermore, a second switch valve is provided at the liquid inlet of the cooling branch of the power distribution room, and the refrigeration cycle of the cooling branch of the power distribution room is opened and closed by controlling the second switch valve.

[0009] Furthermore, a third switch valve is provided at the liquid inlet of the deionization unit, and the deionization unit is put into and removed from the refrigeration cycle by controlling the third switch valve.

[0010] Furthermore, the valve pipeline unit also includes a water replenishment unit, which includes a check valve, a water replenishment pump and a water storage tank. The water replenishment pump is arranged between the water storage tank and the check valve, and the water replenishment unit is arranged at the liquid inlet of the deionization unit.

[0011] Furthermore, the valve pipeline unit also includes a pressure stabilizing unit, which includes a pressure stabilizing tank, which is arranged between the liquid outlet of the cooling branch of the distribution room and the circulation pump of the cooling unit.

[0012] Furthermore, the refrigeration unit includes a compressor, a condenser, a regulating valve and an evaporator connected in series, the evaporator includes an evaporation side and a heat exchange side, the evaporation side is connected in series in the refrigeration unit, and the heat exchange side is connected in series in the cooling unit.

[0013] Furthermore, the valve pipeline unit also includes a heating unit, which includes a heater, and the heater is connected in series with the heat exchange side of the evaporator of the cooling unit.

[0014] Furthermore, the cooling unit includes a filter, a circulation pump and an evaporator connected in series, and the power distribution room cooling branch, the PCS cooling branch, the energy storage battery compartment cooling branch and the deionization unit are all connected in parallel with the evaporator.

[0015] The beneficial effects of the present invention are as follows: as an improved invention, the valve pipeline of the system also includes a deionization unit connected in parallel with the evaporator of the cooling unit and a power distribution room cooling branch connected in parallel with the PCS cooling branch and the energy storage battery compartment cooling branch. When the power distribution room is in a high-pressure state, the switch valves of the power distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are opened, so that the refrigeration cycles of the power distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are all turned on, and the switch valve of the deionization unit is opened to put the deionization unit into operation, so as to control the cooling of the circulation loop in real time. The water conductivity is reduced to meet the operation requirements of high-power power electronic equipment; when the distribution room is in a low-pressure state, the control system closes the switch valves of the PCS cooling branch and the energy storage battery compartment cooling branch, and only opens the switch valve of the distribution room cooling branch, so that the refrigeration cycle of the PCS cooling branch and the energy storage battery compartment cooling branch is closed, and the switch valve of the deionization unit is closed at the same time, and the deionization unit is exited. The liquid cooling system works in a low-power state and only provides cooling capacity for the natural heat dissipation equipment in the distribution room. Therefore, the present invention solves the problem that the prior art cannot meet the refrigeration requirements of the distribution room under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a process flow chart of a liquid cooling system with integrated cooling function for the power distribution room; Figure 2 This is the process flow chart of the liquid cooling system under high-voltage working condition in the power distribution room; Figure 3 It is the process flow chart of the liquid cooling system in the low-voltage working state of the distribution room. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail in a clear and complete manner in conjunction with the accompanying drawings and embodiments.

[0018] The idea of ​​the present invention is that the cooling branch of the distribution room is connected in parallel with the PCS cooling branch and the energy storage battery compartment cooling branch, and the deionization unit is connected in parallel with the cooling unit. When the distribution room is in a high-pressure state, the switch valves of the cooling branch of the distribution room, the PCS cooling branch and the energy storage battery compartment cooling branch are opened, and the deionization unit is put into use; when the distribution room is in a low-pressure state, the switch valves of the PCS cooling branch and the energy storage battery compartment cooling branch are closed, and the deionization unit is removed.

[0019] System Example: like Figure 1The process flow chart of the liquid cooling system with integrated power distribution room cooling function shown in the figure includes a refrigeration unit, a cooling unit and a valve pipeline unit. The refrigeration unit provides cooling energy for the cooling unit. The cooling unit is connected in series with the valve pipeline unit. The valve pipeline unit includes a power distribution room cooling branch, a PCS cooling branch and an energy storage battery compartment cooling branch connected in parallel, and a deionization unit connected in parallel with the cooling unit, wherein the PCS cooling branch and the energy storage battery compartment cooling branch are connected in parallel at the rear end of the power distribution room cooling branch, and the total liquid inlet of the PCS cooling branch and the energy storage battery compartment cooling branch is provided with a first switch valve (VK01 switch valve), and the refrigeration cycle of the PCS cooling branch and the energy storage battery compartment cooling branch is turned on and off by controlling the first switch valve; the liquid inlet of the power distribution room cooling branch is provided with a second switch valve (VK02 switch valve), and the refrigeration cycle of the power distribution room cooling branch is turned on and off by controlling the second switch valve; the liquid inlet of the deionization unit is provided with a third switch valve (VK03 switch valve), and the deionization unit is put into and removed from the refrigeration cycle by controlling the third switch valve.

[0020] The heat dissipation equipment in the power distribution room includes high-power power electronic equipment and natural heat dissipation equipment. When the high-power power electronic equipment in the power distribution room is put into operation, that is, the power distribution room is in a high-voltage working state, the liquid cooling system with integrated power distribution room cooling function is controlled to open the VK01 switch valve and the VK02 switch valve, so that the refrigeration cycle of the power distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are all turned on. At the same time, the control system opens the VK03 switch valve of the deionization unit to put the deionization unit into operation, and controls the cooling water conductivity of the circulation loop in real time to meet the operation requirements of high-power power electronic equipment (system flow chart as shown in the figure below). Figure 2 As shown); when the high-power electronic equipment in the distribution room is not put into operation, that is, the distribution room is in a low-voltage working state, the control system closes VK01 and only opens the VK02 switch valve to close the refrigeration cycle of the PCS cooling branch and the energy storage battery compartment cooling branch. At the same time, the VK03 switch valve is closed, the deionization unit is exited, and the liquid cooling system works in a low-power state, only providing cooling capacity for the natural heat dissipation equipment in the distribution room (the system flow chart is shown in Figure 3 as shown).

[0021] Specifically, the refrigeration unit includes a compressor, a condenser, a throttling component (such as a one-way valve, a regulating valve, a solenoid valve) and an evaporator connected in series. The evaporator includes an evaporation side and a heat exchange side. The evaporation side is connected in series in the refrigeration unit, and the heat exchange side is connected in series in the cooling unit. The working principle of the refrigeration unit is as follows: the compressor compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous state, sends it to the condenser for cooling, and becomes a medium-temperature and high-pressure liquid refrigerant after being cooled by the environment, enters the throttling component for throttling and pressure reduction, and becomes a low-temperature and low-pressure gas-liquid mixture, and absorbs the heat of the refrigerant through the evaporator and vaporizes, becomes a gaseous state, and then returns to the compressor for compression, and continues to circulate for refrigeration. Among them, the compressor can adopt various forms such as vortex type and rotor type; the condenser can adopt various forms such as copper tube aluminum fin type heat exchanger, parallel flow microchannel radiator, etc.; the throttling component can be a thermal expansion valve, an electronic expansion valve, etc.; the evaporator adopts a plate heat exchanger or a shell and tube heat exchanger or other forms of partition heat exchanger.

[0022] The cooling unit includes a filter, a circulation pump and an evaporator connected in series. The cooling branch of the power distribution room, the PCS cooling branch, the energy storage battery compartment cooling branch and the deionization unit are all connected in parallel with the evaporator in the cooling unit. Among them, the circulation pump can be a centrifugal pump, a shielded pump and other forms. Driven by the circulation pump, the refrigerant is transported to the evaporator of the refrigeration unit. The cooled refrigerant is supplied to the cooled device (power distribution room, PCS, energy storage battery compartment), and absorbs heat in the cooled device to complete the entire cycle, and this cycle repeats.

[0023] The valve pipeline unit also includes a water replenishment unit, a voltage stabilizing unit and a heating unit. The water replenishment unit is arranged at the liquid inlet of the deionization unit. The water replenishment unit includes a check valve, a water replenishment pump and a water storage tank. The water replenishment pump is arranged between the water storage tank and the check valve. The water replenishment pump can be a centrifugal pump, a shielded pump and other forms. The water storage tank is provided with a liquid level gauge and a liquid level switch. The system is also provided with a one-way valve and a solenoid valve. When the system needs to replenish water, the solenoid valve can be opened; the deionization unit consists of a deionization tank, a maintenance valve, an electric switch valve, a check valve The electric switch valve can control the on / off state of the deionization circuit, and the check valve controls the flow direction of the cooling water in the deionization circuit to prevent the raw water from directly entering the cooling circuit of the high-power electronic devices in the power distribution room; the voltage stabilizing unit is arranged between the outlet of the cooling branch of the power distribution room and the circulating pump of the cooling unit. The voltage stabilizing unit includes a pressure stabilizing tank and valves. The pressure stabilizing tank can be a capsule pressure stabilizing tank or a gas pressure stabilizing tank. The pressure stabilizing unit is provided with exhaust valves, safety valves and other valves. When the system pressure is higher than the set value, the safety valve releases the pressure. The heating unit includes a heater, which is connected in series with the evaporator of the cooling unit. When the ambient temperature is relatively low in winter, the heater starts, heats the circulating water and supplies it to the cooled device, and completes the entire cycle in the cooled device, and repeats this cycle over and over again.

[0024] The valve pipeline is composed of a self-operated differential pressure control valve, a check valve, a flow regulating valve, and a circulation pipeline. The circulation pipeline can be arranged in a ring network and cooperated with a self-operated differential pressure control valve to ensure that the flow at each end meets the rated requirements.

[0025] The control system consists of a main control board, multiple sensors for temperature, pressure, flow, and control software. The main control board can be in the form of a PLC, a single-chip microcomputer, an industrial computer, etc. Through the electrical control system, the intelligence and energy saving of each control object of the energy storage battery centralized liquid cooling system can be achieved, including mode switching function, call status holding function, timed power on and off function, energy-saving control function, etc.

Claims

1. A liquid cooling system that can be used for cooling a battery compartment power distribution cabinet, comprising a refrigeration unit and a cooling unit, wherein the refrigeration unit provides cooling energy for the cooling unit, the cooling unit is connected in series with a valve pipeline unit, and the valve pipeline unit comprises a parallel PCS cooling branch and an energy storage battery compartment cooling branch, characterized in that: The valve piping unit also includes a deionization unit connected in parallel with the cooling unit and a distribution room cooling branch connected in parallel with the PCS cooling branch and the energy storage battery compartment cooling branch. When the distribution room is in a high-pressure state, the refrigeration cycles of the distribution room cooling branch, the PCS cooling branch and the energy storage battery compartment cooling branch are all turned on, and the deionization unit is put into the refrigeration cycle; when the distribution room is in a low-pressure state, the refrigeration cycle of the distribution room cooling branch is turned on, the refrigeration cycles of the PCS cooling branch and the energy storage battery compartment cooling branch are both closed, and the deionization unit is removed from the refrigeration cycle.

2. The liquid cooling system for cooling a battery compartment power distribution cabinet according to claim 1, characterized in that: When the power distribution room cooling branch, PCS cooling branch and energy storage battery compartment cooling branch are connected in parallel, the PCS cooling branch and the energy storage battery cooling branch are connected in parallel at the rear end of the power distribution room cooling branch, and the total liquid inlet of the PCS cooling branch and the energy storage battery compartment cooling branch is provided with a first switch valve, and the refrigeration cycle of the PCS cooling branch and the energy storage battery compartment cooling branch is opened and closed by controlling the first switch valve.

3. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The liquid inlet of the cooling branch of the power distribution room is provided with a second switch valve, and the refrigeration cycle of the cooling branch of the power distribution room is turned on and off by controlling the second switch valve.

4. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The liquid inlet of the deionization unit is provided with a third switch valve, and the deionization unit is put into and removed from the refrigeration cycle by controlling the third switch valve.

5. The liquid cooling system for cooling a battery compartment power distribution cabinet according to claim 1, characterized in that: The valve pipeline unit also includes a water replenishment unit, which includes a check valve, a water replenishment pump and a water storage tank. The water replenishment pump is arranged between the water storage tank and the check valve, and the water replenishment unit is arranged at the liquid inlet of the deionization unit.

6. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The valve pipeline unit also includes a pressure stabilizing unit, which includes a pressure stabilizing tank, which is arranged between the liquid outlet of the cooling branch of the distribution room and the circulation pump of the cooling unit.

7. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The refrigeration unit comprises a compressor, a condenser, a regulating valve and an evaporator connected in series. The evaporator comprises an evaporation side and a heat exchange side. The evaporation side is connected in series in the refrigeration unit, and the heat exchange side is connected in series in the cooling unit.

8. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The valve pipeline unit further comprises a heating unit, wherein the heating unit comprises a heater, and the heater is connected in series with a heat exchange side of an evaporator of the cooling unit.

9. The liquid cooling system for cooling a battery compartment and a power distribution cabinet according to claim 1, characterized in that: The cooling unit includes a filter, a circulation pump and an evaporator connected in series, and the power distribution room cooling branch, the PCS cooling branch, the energy storage battery compartment cooling branch and the deionization unit are all connected in parallel with the evaporator.

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