Energy storage liquid cooling system capable of reducing auxiliary power consumption and control method

Abstract

The invention provides an energy storage liquid cooling system capable of reducing auxiliary power consumption and a control method.The energy storage liquid cooling system capable of reducing the auxiliary power consumption comprises a water cooling machine and a control system, a first liquid inlet of the water cooling machine and the control system is connected with a liquid storage tank, and a second liquid inlet of the water cooling machine and the control system is connected with a second liquid storage tank; a first liquid outlet of the water cooling machine and control system is connected with the radiator through the compressor; a liquid inlet of the energy storage battery is connected with a second liquid outlet of the water cooling machine and control system; a liquid inlet of the heater is connected with a liquid outlet of the energy storage battery, and a water pump and a water inlet temperature sensor are arranged on a pipeline between the heater and the energy storage battery. According to the invention, the energy loss in the system can be reduced, the problem of high power consumption of the energy storage system in the prior art is solved, and the conversion efficiency of the energy storage system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery control, and in particular to an energy storage liquid cooling system and a control method capable of reducing auxiliary power consumption. Background Art

[0002] Currently, the more mature technical routes for energy storage thermal management on the market are air cooling and liquid cooling. Liquid cooling solutions have significant comprehensive advantages in ensuring the thermal management performance, safety, heat dissipation efficiency, noise, etc. of energy storage systems. The penetration rate of liquid cooling solutions is expected to continue to increase in the future.

[0003] At present, the mainstream of liquid-cooled energy storage cabinets is the standard 0.5C charge and discharge rate. With the breakthrough of liquid-cooled energy storage battery technology, it can achieve a higher charge and discharge rate of 1.0 C. When the energy storage system is standing, charging, and discharging at high temperature or high cold, the liquid cooling system needs to control the temperature so that the energy storage battery can work within the optimal temperature range. When the existing energy storage liquid cooling system stops thermal management, the high-power consumption unit of the control system continues to be open and standby, which is one of the reasons for the high power consumption and low conversion efficiency of the energy storage system.

[0004] There is currently no effective solution to the problem of high power consumption of energy storage systems in existing related technologies. Summary of the invention

[0005] The present invention provides an energy storage liquid cooling system and a control method capable of reducing auxiliary power consumption, so as to solve the defect of high power consumption of the energy storage system in the prior art.

[0006] In a first aspect, the present invention provides an energy storage liquid cooling system capable of reducing auxiliary power consumption, comprising: A water cooler and control system, wherein a first liquid inlet of the water cooler and control system is connected to a liquid storage tank, and a first liquid outlet of the water cooler and control system is connected to a radiator via a compressor; An energy storage battery, wherein the liquid inlet of the energy storage battery is connected to the second liquid outlet of the water chiller and the control system; A heater, wherein the liquid inlet of the heater is connected to the liquid outlet of the energy storage battery, and a water pump and a water inlet temperature sensor are arranged on the pipeline between the heater and the energy storage battery; the liquid outlet of the heater is connected to the second liquid inlet of the water cooler and control system; and a water outlet temperature sensor is arranged on the pipeline between the water cooler and control system and the energy storage battery.

[0007] According to an energy storage liquid cooling system capable of reducing auxiliary power consumption provided by the present invention, a water outlet pressure sensor is provided on the pipeline between the water cooler and control system and the energy storage battery, and a water inlet pressure sensor is provided on the pipeline between the water pump and the energy storage battery.

[0008] According to an energy storage liquid cooling system capable of reducing auxiliary power consumption provided by the present invention, an expansion kettle is provided on the pipeline between the water pump and the energy storage battery, and the expansion kettle is used to balance the pressure in the pipeline.

[0009] According to an energy storage liquid cooling system capable of reducing auxiliary power consumption provided by the present invention, an electronic expansion valve is provided on the pipeline between the water chiller and the control system and the liquid storage tank.

[0010] In a second aspect, the present invention further provides a method for controlling energy storage liquid cooling capable of reducing auxiliary power consumption, which is applied to the energy storage liquid cooling system capable of reducing auxiliary power consumption described in the first aspect, comprising: Determine the working condition of the energy storage battery; the working condition of the energy storage battery includes a working state and a static state; Under the working conditions corresponding to the energy storage battery, the temperature of the coolant is monitored to obtain a monitoring result; Determining the thermal management requirements of the energy storage battery based on the monitoring results; the thermal management requirements include cooling requirements and heating requirements; The coolant temperature is adjusted according to the thermal management requirements of the energy storage battery until the coolant temperature is within the required range of the energy storage battery, and the coolant is delivered to the energy storage battery to adjust the temperature of the energy storage battery.

[0011] According to a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, the energy storage battery is in a working state: If the energy storage battery has a cooling demand, the compressor and the radiator are controlled to work, the temperature of the coolant is adjusted to the required range of the energy storage battery, and the water pump is controlled to transport the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the compressor, water pump and radiator are turned off.

[0012] According to a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, the energy storage battery is in a working state: If the energy storage battery has a heating demand, the heater is controlled to work to heat the temperature of the coolant to the required range of the energy storage battery, and the water pump is controlled to transport the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the water pump and heater are turned off.

[0013] According to a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, the energy storage battery is in a stationary state: When the energy storage battery has no thermal management requirements and the coolant temperature exceeds the required range of the energy storage battery, the compressor, water pump and radiator are controlled to operate, and the compressor, water pump and radiator are turned off after the coolant temperature is adjusted to the required range of the energy storage battery.

[0014] According to a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, the energy storage battery is in a stationary state: When the energy storage battery has no thermal management requirements and the coolant temperature is lower than the required range of the energy storage battery, the heater and the water pump are controlled to operate, and the heater and the water pump are turned off after the coolant temperature is heated to the required range of the energy storage battery.

[0015] According to a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, a chiller and a control system include several power units inside. When there is no thermal management requirement for the energy storage battery, the power units inside the chiller and the control system are turned off.

[0016] The energy storage liquid cooling system provided by the present invention can reduce the auxiliary power consumption, and obtains the monitoring results by monitoring the temperature of the coolant. The thermal management requirements of the energy storage battery are determined based on the monitoring results, that is, it is determined whether the energy storage battery has a cooling requirement or a heating requirement, or has no thermal management requirement. Then, according to the thermal management requirements of the energy storage battery, the temperature of the coolant is adjusted by a radiator or a heater until the temperature of the coolant meets the requirement range of the energy storage battery. If the energy storage battery is in a working state, the coolant needs to be transported to the energy storage battery by a water pump to adjust the temperature of the energy storage battery. After the temperature adjustment is completed, the radiator, heater, water pump, water cooling unit and power unit inside the control system are turned off to reduce the energy loss in the system, thereby solving the problem of high power consumption of the energy storage system in the existing related technologies and improving the conversion efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural block diagram of the energy storage liquid cooling system provided by the present invention that can reduce auxiliary power consumption; Figure 2 It is a flow chart of the energy storage liquid cooling control method provided by the present invention which can reduce auxiliary power consumption.

[0019] Reference numerals: 1: Energy storage battery; 2: Water outlet temperature sensor; 3: Water outlet pressure sensor; 4: Water cooler and control system; 5: Electronic expansion valve; 6: Liquid storage tank; 7: Radiator; 8: Compressor; 9: Heater; 10: Water pump; 11: Water inlet temperature sensor; 12: Expansion kettle; 13: Water inlet pressure sensor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention provides an energy storage liquid cooling system capable of reducing auxiliary power consumption. Figure 1 is a structural block diagram of the energy storage liquid cooling system provided by the present invention that can reduce auxiliary power consumption, such as Figure 1 As shown, the system includes: A water cooler and control system 4, wherein a first liquid inlet of the water cooler and control system 4 is connected to a liquid storage tank 6, and a first liquid outlet of the water cooler and control system 4 is connected to a radiator 7 via a compressor 8; Energy storage battery 1, the liquid inlet of the energy storage battery 1 is connected to the second liquid outlet of the water cooling machine and control system 4; Heater 9, the liquid inlet of heater 9 is connected with the liquid outlet of energy storage battery 1, and a water pump 10 and a water inlet temperature sensor 11 are arranged on the pipeline between heater 9 and energy storage battery 1; the liquid outlet of heater 9 is connected with the second liquid inlet of water cooler and control system 4; the water outlet temperature sensor 2 is arranged on the pipeline between water cooler and control system 4 and energy storage battery 1.

[0022] In this system, the temperature of the coolant is monitored to obtain monitoring results. Based on the monitoring results, the thermal management requirements of the energy storage battery 1 are determined, that is, it is determined whether the energy storage battery 1 has a cooling requirement or a heating requirement, or has no thermal management requirement. Then, according to the thermal management requirements of the energy storage battery 1, the temperature of the coolant is adjusted through the radiator 7 or the heater 9 until the temperature of the coolant meets the requirement range of the energy storage battery 1. If the energy storage battery 1 is in a working state, the coolant needs to be transported to the energy storage battery 1 through the water pump 10 to adjust the temperature of the energy storage battery 1. After the temperature adjustment is completed, the radiator 7, the heater 9, the water pump 10, and the power units inside the water cooling unit and the control system 4 are turned off to reduce the energy loss in the system, thereby solving the problem of high power consumption of the energy storage system in the existing related technologies.

[0023] In some of the embodiments, a water outlet pressure sensor 3 is provided on the pipeline between the water cooler and control system 4 and the energy storage battery 1 , and a water inlet pressure sensor 13 is provided on the pipeline between the water pump 10 and the energy storage battery 1 .

[0024] In this embodiment, the coolant pressure in the system pipeline can be monitored in real time through the water inlet pressure sensor 13 and the water outlet pressure sensor 3, so that the staff can promptly detect abnormal coolant pressure conditions and deal with abnormal faults, thereby improving the safety of the system pipeline hydraulics.

[0025] Furthermore, an expansion kettle 12 is provided on the pipeline between the water pump 10 and the energy storage battery 1, and the expansion kettle 12 is used to balance the pressure in the pipeline. When the hydraulic pressure of the coolant in the system pipeline is abnormal, the expansion kettle 12 can balance the coolant, thereby preventing serious leakage accidents due to the staff's failure to find the abnormality in time, and further improving the safety of the system pipeline.

[0026] In some of the embodiments, an electronic expansion valve 5 is provided on the pipeline between the water-cooling machine and control system 4 and the liquid storage tank 6. The electronic expansion valve 5 can facilitate the staff to control the circulation of the coolant in the system pipeline.

[0027] The present invention provides a method for controlling energy storage liquid cooling capable of reducing auxiliary power consumption, which is applied to the energy storage liquid cooling system capable of reducing auxiliary power consumption as claimed in the claims. Figure 2 is a flow chart of a method for controlling energy storage liquid cooling that can reduce auxiliary power consumption provided by the present invention, such as Figure 2 As shown, the method comprises the following steps: Step S201, determining the working condition of the energy storage battery; the working condition of the energy storage battery includes a working state and a static state.

[0028] Step S202, under the working conditions corresponding to the energy storage battery, monitor the temperature of the coolant to obtain a monitoring result.

[0029] Step S203, determining the thermal management requirements of the energy storage battery based on the monitoring results; the thermal management requirements include cooling requirements and heating requirements.

[0030] Step S204, adjusting the temperature of the coolant according to the thermal management requirements of the energy storage battery until the temperature of the coolant is within the required range of the energy storage battery, and delivering the coolant to the energy storage battery to adjust the temperature of the energy storage battery.

[0031] In this method, the chiller and the control system include several power units. When the energy storage battery has no thermal management requirements, the power units inside the chiller and the control system are turned off. First, the temperature of the coolant is monitored to obtain the monitoring results. Based on the monitoring results, the thermal management requirements of the energy storage battery are determined, that is, it is determined whether the energy storage battery has cooling requirements or heating requirements, or has no thermal management requirements. Then, according to the thermal management requirements of the energy storage battery, the temperature of the coolant is adjusted through a radiator or a heater until the temperature of the coolant meets the required range of the energy storage battery. If the energy storage battery is in working condition, the coolant needs to be transported to the energy storage battery through a water pump to adjust the temperature of the energy storage battery. After the temperature adjustment is completed, the radiator, heater, water pump, and power units inside the water cooling unit and the control system are turned off to reduce the energy loss in the system, thereby solving the problem of high power consumption of the energy storage system in the existing related technologies.

[0032] Specifically, when the energy storage battery is in working state: if the energy storage battery has cooling demand, the compressor and radiator are controlled to work, the temperature of the coolant is adjusted to the required range of the energy storage battery, and the water pump is controlled to deliver the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the compressor, water pump and radiator are turned off. If the energy storage battery has heating demand, the heater is controlled to work, the temperature of the coolant is heated to the required range of the energy storage battery, and the water pump is controlled to deliver the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the water pump and heater are turned off.

[0033] For example, under high temperature conditions, when the energy storage battery is working, there is a need for thermal management, and the energy storage battery has a cooling demand. The control system controls the compressor to work for cooling and the radiator to work, so that the coolant temperature drops to the range required by the battery, and controls the water pump to work so that the coolant flows into the energy storage battery to cool the energy storage battery, so that the energy storage battery is within a suitable temperature range. When the energy storage battery has no thermal management demand, the compressor, water pump and radiator, water cooling unit and control system power unit are turned off to reduce power consumption.

[0034] Under low temperature conditions, there is a need for thermal management when the energy storage battery is working, and the energy storage battery has a heating demand. The control system controls the heater to heat the coolant temperature to within the battery requirement range, and controls the water pump to allow the coolant to flow into the energy storage battery to heat the energy storage battery. When the energy storage battery is within the appropriate temperature range and there is no need for thermal management, the heater, water pump, water cooling unit and control system power unit are turned off to reduce power consumption.

[0035] There is no need for thermal management when the energy storage battery is working. It is prohibited to turn on the compressor, water pump, radiator, heater, water cooling unit and control system power unit to reduce power consumption.

[0036] When the energy storage battery is in a static state: When the energy storage battery has no thermal management requirements and the coolant temperature exceeds the required range of the energy storage battery, the compressor, water pump and radiator are controlled to work, and the coolant temperature is adjusted to the required range of the energy storage battery, and then the compressor, water pump and radiator are turned off. When the energy storage battery has no thermal management requirements and the coolant temperature is lower than the required range of the energy storage battery, the heater and water pump are controlled to work, and the coolant temperature is heated to the required range of the energy storage battery, and then the heater and water pump are turned off.

[0037] For example, when the energy storage battery is at rest and there is no need for thermal management, and the coolant temperature is too high, the control system controls the compressor to work for cooling, the radiator and the water pump to work, so that the coolant temperature drops to the target temperature value. After the coolant reaches the target temperature value, the compressor, water pump and radiator, water cooling unit and control system power unit are turned off to reduce power consumption.

[0038] When the energy storage battery is at rest and there is no need for thermal management, and the coolant temperature is too low, the control system controls the heater and water pump to work so that the coolant temperature is heated to the target temperature value. After the coolant temperature reaches the target temperature value, the heater, water pump, water cooling unit and control system power unit are turned off to reduce power consumption.

[0039] When the static coolant temperature of the energy storage battery is within the target temperature range, it is prohibited to start the compressor, water pump, radiator, heater, water cooling unit and control system power unit to reduce power consumption.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy storage liquid cooling system capable of reducing auxiliary power consumption, characterized in that: include: A water cooler and control system (4), wherein a first liquid inlet of the water cooler and control system (4) is connected to a liquid storage tank (6), and a first liquid outlet of the water cooler and control system (4) is connected to a radiator (7) via a compressor (8); An energy storage battery (1), wherein a liquid inlet of the energy storage battery (1) is connected to a second liquid outlet of the water cooling machine and control system (4); A heater (9), wherein a liquid inlet of the heater (9) is connected to a liquid outlet of the energy storage battery (1), and a water pump (10) and a water inlet temperature sensor (11) are provided on a pipeline between the heater (9) and the energy storage battery (1); the liquid outlet of the heater (9) is connected to a second liquid inlet of the water cooling machine and control system (4); and a water outlet temperature sensor (2) is provided on a pipeline between the water cooling machine and control system (4) and the energy storage battery (1).

2. The energy storage liquid cooling system capable of reducing auxiliary power consumption according to claim 1 is characterized in that: A water outlet pressure sensor (3) is provided on the pipeline between the water cooling machine and control system (4) and the energy storage battery (1), and a water inlet pressure sensor (13) is provided on the pipeline between the water pump (10) and the energy storage battery (1).

3. The energy storage liquid cooling system capable of reducing auxiliary power consumption according to claim 1 is characterized in that: An expansion kettle (12) is provided on the pipeline between the water pump (10) and the energy storage battery (1), and the expansion kettle (12) is used to balance the pressure in the pipeline.

4. The energy storage liquid cooling system capable of reducing auxiliary power consumption according to claim 1 is characterized in that: An electronic expansion valve (5) is provided on the pipeline between the water cooling machine and control system (4) and the liquid storage tank (6).

5. A method for controlling energy storage liquid cooling capable of reducing auxiliary power consumption, applied to the energy storage liquid cooling system capable of reducing auxiliary power consumption as claimed in any one of claims 1 to 4, characterized in that: include: Determine the working condition of the energy storage battery; the working condition of the energy storage battery includes a working state and a static state; Under the working conditions corresponding to the energy storage battery, the temperature of the coolant is monitored to obtain a monitoring result; Determining the thermal management requirements of the energy storage battery based on the monitoring results; the thermal management requirements include cooling requirements and heating requirements; The coolant temperature is adjusted according to the thermal management requirements of the energy storage battery until the coolant temperature is within the required range of the energy storage battery, and the coolant is delivered to the energy storage battery to adjust the temperature of the energy storage battery.

6. The energy storage liquid cooling control method capable of reducing auxiliary power consumption according to claim 5 is characterized in that: The energy storage battery is in working condition: If the energy storage battery has a cooling demand, the compressor and the radiator are controlled to work, the temperature of the coolant is adjusted to the required range of the energy storage battery, and the water pump is controlled to transport the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the compressor, water pump and radiator are turned off.

7. The energy storage liquid cooling control method capable of reducing auxiliary power consumption according to claim 5 is characterized in that: The energy storage battery is in working condition: If the energy storage battery has a heating demand, the heater is controlled to work to heat the temperature of the coolant to the required range of the energy storage battery, and the water pump is controlled to transport the coolant to the energy storage battery until the energy storage battery has no thermal management demand, and the water pump and heater are turned off.

8. The energy storage liquid cooling control method capable of reducing auxiliary power consumption according to claim 5 is characterized in that: The energy storage battery is in a static state: When the energy storage battery has no thermal management requirements and the coolant temperature exceeds the required range of the energy storage battery, the compressor, water pump and radiator are controlled to operate, and the compressor, water pump and radiator are turned off after the coolant temperature is adjusted to the required range of the energy storage battery.

9. The energy storage liquid cooling control method capable of reducing auxiliary power consumption according to claim 5, characterized in that: The energy storage battery is in a static state: When the energy storage battery has no thermal management requirements and the coolant temperature is lower than the required range of the energy storage battery, the heater and the water pump are controlled to operate, and the heater and the water pump are turned off after the coolant temperature is heated to the required range of the energy storage battery.

10. The energy storage liquid cooling control method capable of reducing auxiliary power consumption according to claim 5, characterized in that: The chiller and the control system include several power units inside. When the energy storage battery has no thermal management requirements, the power units inside the chiller and the control system are turned off.

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