Energy-storage and energy-saving immersed control system

Abstract

The invention provides an energy-storage and energy-saving immersed control system. The system comprises a circulation module, a cooling and heating module, a battery management module and a control module, the circulating module comprises a liquid storage tank, a variable-frequency circulating pump, a liquid supply pipeline, a backflow pipeline and a control valve; the cooling and heating module consists of a cooling host and a heating host, and cools or heats the liquid according to an instruction of the control system module; the battery management module comprises a temperature sensor and a liquid level sensor which are respectively used for acquiring temperature and liquid level parameters in a battery box and feeding back the temperature and liquid level parameters to the control module; the control module receives data from the battery management module, analyzes the data, and issues an instruction to the circulating module and the cooling and heating module according to an analysis result; the working modes of the system comprise a comprehensive energy-saving cooling mode, an efficient working mode and an emergency mode. The system has high-efficiency heat management capability, realizes high-efficiency cooling of the battery cell by adjusting the liquid cooling flow, and improves the energy-saving effect.

Description

Technical Field

[0001] The invention belongs to the field of energy storage battery systems, and in particular relates to an energy storage energy-saving immersion control system. Background Art

[0002] Energy storage battery systems are widely used in power systems, energy storage equipment and other fields, but battery thermal management has become a key technical challenge. Traditional air cooling methods are inefficient in high energy density battery systems and it is difficult to effectively control battery temperature, especially in the case of thermal runaway, and it is difficult to prevent fire and explosion. Summary of the invention

[0003] In view of the shortcomings of the above technologies, the present invention provides an energy storage energy-saving immersion control system, the system comprising:

[0004] The system comprises: a circulation module, a cooling and heating module, a battery management module, and a control module. The circulation module comprises a liquid storage tank, a variable frequency circulation pump, a liquid supply pipeline, a return pipeline, and a control valve. The variable frequency circulation pump pressurizes the immersion cooling liquid, delivers it to each battery box through the liquid supply pipeline, and then returns the immersion cooling liquid to the liquid storage tank through the return pipeline. The control valve is arranged on the liquid supply pipeline and the return pipeline, and each battery box has a control valve at its liquid inlet. The cooling and heating module is composed of a cooling host and a heating host, and cools or heats the liquid according to the instructions of the control system module. The battery management module comprises a temperature sensor and a liquid level sensor. The temperature sensor is used to collect the temperature parameters and the cell temperature parameters in the battery box, and the liquid level sensor is used to collect the liquid level parameters in the battery box and feed them back to the control module. The control module receives the data from the battery management module, performs corresponding analysis according to the system working mode, and issues instructions to the circulation module and the cooling and heating module according to the analysis results. The system working modes include: comprehensive energy-saving cooling mode, high-efficiency working mode, and emergency mode.

[0005] When the system is set to the comprehensive energy-saving cooling mode, the control module cross-calculates the cooling demand of the system through a multivariate regression model based on the real-time data and weather forecast data provided by the battery management module, and controls the operation of the cooling and heating modules according to the cooling demand.

[0006] When the system is set to the high-efficiency working mode, the control module uses the PID control algorithm to calculate the system cooling demand based on the real-time data provided by the battery management module, and controls the cooling and heating modules to work according to the cooling demand.

[0007] When the system detects that the temperature of any temperature sensor inside the battery box reaches or exceeds the preset trigger temperature, the emergency mode is activated.

[0008] Furthermore, when the system is set to the comprehensive energy-saving cooling mode, the control module cross-calculates the cooling demand of the system through a multivariate regression model based on the real-time data and weather forecast data provided by the battery management module, including:

[0009] Read the real-time data of the battery management module, the real-time data including the internal temperature of the battery box, the battery core temperature, the liquid inlet temperature and the liquid return temperature; obtain the ambient temperature and the battery working status data;

[0010] Calculate the temperature difference: ΔT = T inlet -T outlet , where: T inlet is the inlet temperature, T outlet is the return liquid temperature; calculate the average temperature: Where n is the number of single cells in the battery pack, T cell,i is the temperature of the nth single cell;

[0011] According to the current battery cell temperature and charge and discharge rate, the battery cell operating temperature T is obtained by looking up the table. ideal ;

[0012] Cross-calculation cooling demand: C = a1·ΔT + a2·T avg +a3·T env +a4·W charge +a5·W discharge +a6·W idle +a7·(T avg -T ideal ), where T env is the ambient temperature, W charge Battery state of charge weight, W discharge is the battery discharge state weight, W idle is the battery idle state weight, a1, a2, a3, a4, a5, a6, a7 are weight coefficients;

[0013] Set the cooling demand threshold C threshold , when C>C threshold , start the cooling system.

[0014] Furthermore, when the system is set to the high-efficiency working mode, the control module calculates the system cooling demand using the PID control algorithm according to the real-time data provided by the battery management module, including:

[0015] Read the real-time data of the battery management module, including the internal temperature of the battery box, the liquid inlet temperature and the liquid return temperature, and obtain the real-time ambient temperature and battery working status data;

[0016] Calculate the temperature difference: ΔT = T inlet -Toutlet , where: T inlet is the inlet temperature, T outlet is the liquid return temperature;

[0017] Calculate the average temperature: Where n is the number of single cells in the battery pack, T cell,i is the temperature of the nth single cell;

[0018] When T avg With T ideal When the difference between T and TC exceeds the preset threshold, the cooling system is started and the PID control algorithm is used to adjust the output of the cooling system so that T avg With T ideal The difference is less than the preset threshold.

[0019] Furthermore, when the emergency mode is activated, it includes:

[0020] Cut off all power output and input of the battery box, and stop charging and discharging;

[0021] Quickly transfer the cooling liquid in other battery boxes to the high-temperature box to ensure that the high-temperature box is filled with cooling liquid;

[0022] The cooling host runs at full power to cool the high-temperature box;

[0023] After the cooling time reaches the preset time, the temperature is manually checked to decide whether to stop cooling;

[0024] If no manual stop command is received, continue cooling and repeat the manual inspection process until a stop command is received.

[0025] Furthermore, the circulation module also includes a pressure relief valve, a main valve, a liquid inlet valve, an explosion-proof valve, and a filter, and the main valve is used to control the total flow of the liquid.

[0026] Furthermore, the temperature sensor includes a liquid inlet temperature sensor, a battery cell temperature sensor, an internal environment temperature sensor, and a liquid return temperature sensor, and each battery cell includes at least one battery cell temperature sensor.

[0027] The present application provides an energy storage energy-saving immersion control system with efficient thermal management capabilities. By adjusting the liquid cooling flow, efficient cooling of the battery cell is achieved. The liquid cooling flow is adjusted in real time according to the temperature of the battery pack to ensure that the battery operates within the optimal temperature range. By mobilizing the liquid between the boxes, the battery compartment does not need the thermal conductive liquid to completely cover the battery cell under non-extreme conditions, thereby saving the amount of thermal conductive liquid and playing a role in reducing costs and increasing efficiency. The immersion liquid level technology is adopted to allow the coolant to directly contact the battery cell, further improving the cooling effect. At the same time, the system is equipped with a fire-fighting function, which can respond in time when the battery thermal runaway is detected, and effectively control the fire by calling other boxes of hydrocarbon refrigerants and other fire-fighting measures to prevent the spread of the fire. The system adjusts the amount of new environmentally friendly hydrocarbon refrigerants according to the environmental conditions of different regions to ensure that reasonable temperature control can be achieved in various environments. The new environmentally friendly hydrocarbon refrigerants it uses are not only efficient, but also reduce carbon emissions, meet green environmental protection requirements, and have strong economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] Figure 1 It is a structural block diagram of the energy storage and energy-saving immersion control system in the embodiment.

[0030] Figure 2 It is a working flow chart of the energy storage and energy-saving immersion control system in the embodiment.

[0031] Figure 3 It is a workflow diagram of the comprehensive energy-saving cooling mode in the embodiment.

[0032] Figure 4 1 is a flowchart of the efficient working mode in the embodiment.

[0033] Figure 5 4 is an emergency mode workflow diagram in the embodiment.

[0034] 1. Frequency conversion circulation pump; 2. Cooling host; 3. Heating host; 4. Liquid supply pipeline pressure relief valve; 5. Main valve; 6. Liquid supply main pipeline; 7. Liquid inlet temperature sensor; 8. Liquid inlet valve; 9. Temperature sensor I; 10. Cell temperature sensor; 11. Liquid level sensor; 12. Temperature sensor II; 13. Pressure relief valve; 14. Explosion-proof valve; 15. Return liquid temperature sensor; 16. Return liquid main pipeline valve; 17. Filter; 18. Return pipeline pressure relief valve; 19. Liquid filling port; 20. Liquid storage tank; 21. Return main pipeline; 22. Liquid delivery main pipeline. DETAILED DESCRIPTION

[0035] This embodiment provides an energy storage energy-saving immersion control system, which specifically includes:

[0036] The system includes: a circulation module, a cooling and heating module, a battery management module, and a control module.

[0037] The circulation module includes a liquid storage tank, a variable frequency circulation pump, a liquid supply pipe, a return pipe, and a control valve. The variable frequency circulation pump pressurizes the immersion coolant, transports it to each battery box through the liquid supply pipe, and then returns the immersion coolant to the liquid storage tank through the return pipe. The control valve is arranged on the liquid supply pipe and the return pipe, and each battery box has a control valve at its liquid inlet.

[0038] The cooling and heating module is composed of a cooling host and a heating host, and cools or heats the liquid according to the instructions of the control system module.

[0039] The battery management module includes a temperature sensor and a liquid level sensor. The temperature sensor is used to collect temperature parameters and cell temperature parameters in the battery box. The liquid level sensor is used to collect liquid level parameters in the battery box and feed them back to the control module.

[0040] The control module receives data from the battery management module, performs corresponding analysis according to the system working mode, and issues instructions to the circulation module and the cooling and heating module according to the analysis results.

[0041] The circulation module also includes a pressure relief valve, a main valve, a liquid inlet valve, an explosion-proof valve, and a filter. The main valve is used to control the total flow of the liquid.

[0042] As the fourth type of coolant (cold plate coolant / fluorinated liquid / oil), immersion coolant has the advantages of safety, environmental protection, high efficiency and energy saving, good refrigeration effect, strong adaptability and easy filling.

[0043] The temperature sensors include a liquid inlet temperature sensor, a battery cell temperature sensor, an in-box ambient temperature sensor, and a liquid return temperature sensor, and each battery cell includes at least one battery cell temperature sensor.

[0044] like Figure 1 As shown, the liquid filling port 19 adds immersion coolant to the liquid storage tank 20, and the immersion coolant is pressurized by the variable frequency circulation pump 1, and after the temperature is adjusted by the cooling host 2 or the heating host 3, it is sent to the liquid delivery main pipeline 22 through the liquid supply main pipeline 6, and then sent to each battery box. A liquid supply pipeline pressure relief valve 4 and a main valve 5 are arranged on the liquid supply main pipeline 6, and a liquid inlet temperature sensor 7 and a liquid inlet valve 8 are arranged on the liquid delivery main pipeline 22. The liquid inlet valve 8 is used to control the flow rate of the liquid entering the battery box.

[0045] After the immersion coolant passes through each battery box to adjust the temperature of the battery box, it is returned to the variable frequency circulation pump 1 through the reflux main pipe 21 to complete a cycle. A return liquid temperature sensor 15 is provided at the outlet pipe of each box, and a return liquid main pipe valve 16, a filter 17, and a reflux pipe pressure relief valve 18 are provided on the reflux main pipe 21.

[0046] A temperature sensor I9, a temperature sensor II12, a liquid level sensor 11, a pressure relief valve 13, and an explosion-proof valve 14 are also provided inside each box, and a battery cell temperature sensor 10 is provided inside each battery cell.

[0047] The system working modes include: comprehensive energy-saving cooling mode, high-efficiency working mode, emergency mode, such as Figure 2 When the system is set to the comprehensive energy-saving cooling mode, the control module cross-calculates the system cooling demand through the multivariate regression model according to the real-time data of the battery management module and the weather forecast data, and controls the cooling and heating modules to work according to the cooling demand; when the system is set to the high-efficiency working mode, the control module calculates the system cooling demand according to the real-time data of the battery management module using the PID control algorithm, and controls the cooling and heating modules to work according to the cooling demand; when the system detects that the temperature of any temperature collection point inside the battery box reaches or exceeds the preset trigger temperature, the emergency mode is activated.

[0048] When the system is set to comprehensive energy-saving cooling mode, its working process is as follows: Figure 3 shown.

[0049] Read the real-time data of the battery management module, the data including the internal temperature of each battery pack, the battery cell temperature, the liquid inlet temperature and the liquid outlet temperature; obtain real-time weather forecast data, battery cell table value, historical ambient temperature, real-time ambient temperature, and battery working status data.

[0050] Calculate the temperature difference: ΔT = T inlet -T outlet .

[0051] Calculate the average temperature:

[0052] According to the current battery cell temperature and charge and discharge rate, the ideal temperature T is obtained by looking up the table. indeal .

[0053] Cross-calculation cooling demand: C = a1·ΔT + a2·T avg +a3·T env +a4·W charge +a5·W discharge +a6·W idle +a7·(T avg -T ideal). charge , W discharge , W idle Usually the value is 0 or 1.

[0054] a1 (temperature difference): Generally, the larger the temperature difference, the greater the demand for the thermal management system, so the coefficient should be a positive value.

[0055] a2 (average temperature): When the average temperature of the battery pack is higher, the demand on the thermal management system usually increases, so this coefficient should also be positive.

[0056] a3 (ambient temperature): The higher the ambient temperature, the more cooling the system requires, so this coefficient should also be positive.

[0057] a4 (Charging state): The charging state usually generates more heat than the discharging state, so it is reasonable to have a higher weight.

[0058] a5 (discharge state): Discharge also generates heat, but it is usually lower than charging, so the coefficient should be lower than the charging state.

[0059] a6 (stationary state): The stationary state usually does not generate heat, so the coefficient should be minimum or close to zero.

[0060] a7 (ideal temperature difference): When the actual temperature is far from the ideal temperature, more thermal management system intervention is required, so the coefficient should be a positive value.

[0061] Set the cooling demand threshold C threshold , when C>C threshold , start the cooling system.

[0062] Assume we have the following data: ΔT = 5°C, T avg =30℃、T env = 35℃, the weather forecast shows that the ambient temperature will be 30℃ in the next few days, and the battery is charging, so W charge =1, W discharge =0, W idle =0, check the table to get the ideal temperature T ideal =25°C, set regression coefficients a1=0.5, a2=0.3, a3=0.2, a4=1, a5=1, a6=1, a7=0.4.

[0063] Calculate cooling requirements: C = 0.5*5+0.3*30+0.2*35+1*1+1*0+1*0+0.4*(30-25)] = 21.5.

[0064] Set the cooling demand threshold C threshold =15, so C=21.5>15, so the cooling system needs to be started.

[0065] Comparison of optimization and energy saving effects:

[0066] Energy consumption of traditional cooling system: The cooling system power is 5kW, cooling for 8 hours per day, and the daily energy consumption is: E trad =5kW×8h=40kWh / day.

[0067] Energy saving estimation of this system: Assume that the new solution can reduce the cooling time by 2 hours per day through the optimization strategy, that is, cooling for 6 hours per day. new =5kW×6h=30kWh / day. Daily energy saving: ΔE=E trad -E new =40kWh / day-30kWh / day=10kWh / day. Annual energy saving: Based on 365 days per year, annual energy saving is: ΔE year =10kWh / day×365days=3650kWh / year.

[0068] The above optimization scheme can achieve more accurate cooling demand judgment and system control, significantly improve energy saving effect, and ensure system safety and stability. Combining the cell temperature and charge and discharge rate table value, the cooling strategy is further optimized, improving the energy saving and safety of the system.

[0069] When the system is set to high-efficiency working mode, its workflow is as follows Figure 4 shown.

[0070] Read the real-time data of the battery management module, including the internal single cell temperature, liquid inlet temperature and liquid outlet temperature of each battery pack, obtain the battery cell table value, real-time ambient temperature and battery working status data.

[0071] Calculate the temperature difference: ΔT = T inlet -T outlet .

[0072] Calculate the average temperature:

[0073] When T avg With T ideal When the difference between T and TC exceeds the preset threshold, the cooling system is started and the PID control algorithm is used to adjust the output of the cooling system so that T avg With T ideal The difference is less than the preset threshold.

[0074] The goal of keeping the battery cell temperature constant at 25°C is achieved through an efficient cooling system. Based on real-time monitoring data, the system dynamically adjusts the cooling system output to ensure that the internal temperature of the battery pack is stable within the ideal range. Regardless of energy consumption, the system will continue to work and provide a stable cooling effect. This solution ensures the optimal operating temperature of the battery cell and ensures efficient operation and long life of the battery system.

[0075] When the system is in emergency mode, its workflow is as follows Figure 5 shown.

[0076] Cut off all power output and input of the battery box, and stop charging and discharging.

[0077] Quickly transfer the cooling liquid in other battery boxes to the high-temperature box to ensure that the high-temperature box is filled with cooling liquid.

[0078] The cooling host runs at full power to cool the high-temperature box.

[0079] After the cooling time reaches the preset time, the temperature is manually checked to decide whether to stop cooling.

[0080] If no manual stop command is received, continue cooling and repeat the manual inspection process until a stop command is received.

[0081] The emergency mode uses a temperature sensor to preset the temperature and make predictive actions. If there is a risk of thermal runaway of the battery cells inside the box, the control system unit will issue a command to draw liquid from other boxes to the box that needs to be quickly extinguished or put out the fire, thereby preventing the battery cells inside the box from spreading to other cells and avoiding a domino effect.

[0082] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0083] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An energy storage energy-saving immersion control system, used for battery thermal management in energy storage battery systems, characterized in that: The system includes: a circulation module, a cooling and heating module, a battery management module, and a control module; The circulation module includes a liquid storage tank, a variable frequency circulation pump, a liquid supply pipe, a return pipe, and a control valve. The variable frequency circulation pump pressurizes the immersion coolant and delivers it to each battery box through the liquid supply pipe, and then returns the immersion coolant to the liquid storage tank through the return pipe. The control valve is arranged on the liquid supply pipe and the return pipe, and each battery box has a control valve at its liquid inlet. The cooling and heating module is composed of a cooling host and a heating host, and cools or heats the liquid according to the instructions of the control system module; The battery management module includes a temperature sensor and a liquid level sensor. The temperature sensor is used to collect temperature parameters and cell temperature parameters in the battery box. The liquid level sensor is used to collect liquid level parameters in the battery box and feed them back to the control module. The control module receives data from the battery management module, performs corresponding analysis according to the system working mode, and issues instructions to the circulation module and the cooling and heating module according to the analysis results; The system working modes include: comprehensive energy-saving cooling mode, high-efficiency working mode, and emergency mode; When the system is set to the comprehensive energy-saving cooling mode, the control module cross-calculates the cooling demand of the system through a multivariate regression model based on the real-time data and weather forecast data provided by the battery management module, and controls the operation of the cooling and heating modules according to the cooling demand; When the system is set to high-efficiency working mode, the control module uses the PID control algorithm to calculate the system cooling demand based on the real-time data provided by the battery management module, and controls the cooling and heating modules to work according to the cooling demand; When the system detects that the temperature of any temperature sensor inside the battery box reaches or exceeds the preset trigger temperature, the emergency mode is activated.

2. The control system according to claim 1, characterized in that: When the system is set to the comprehensive energy-saving cooling mode, the control module cross-calculates the cooling demand of the system through a multivariate regression model based on the real-time data and weather forecast data provided by the battery management module, including: Read the real-time data of the battery management module, the real-time data including the internal temperature of the battery box, the battery core temperature, the liquid inlet temperature and the liquid return temperature; obtain the ambient temperature and the battery working status data; Calculate the temperature difference: ΔT = T inlet -T outlet , where: T inlet is the inlet temperature, T outlet is the return liquid temperature; calculate the average temperature: Where n is the number of single cells in the battery pack, T cell,i is the temperature of the nth single cell; According to the current battery cell temperature and charge and discharge rate, the battery cell operating temperature T is obtained by looking up the table. ideal ; Cross-calculation cooling demand: C = a1·ΔT + a2·T avg +a3·T env +a4·W charge +a5·W charge +a6·W idle +a7·(T avg -T ideal ), where T env is the ambient temperature, W charge Battery state of charge weight, W discharge is the battery discharge state weight, W idle is the battery idle state weight, a1, a2, a3, a4, a5, a6, a7 are weight coefficients; Set the cooling demand threshold C threshold , when C>C threshold , start the cooling system.

3. The control system according to claim 1, characterized in that: When the system is set to the high-efficiency working mode, the control module uses the PID control algorithm to calculate the system cooling demand according to the real-time data provided by the battery management module, including: Read the real-time data of the battery management module, including the internal temperature of the battery box, the liquid inlet temperature and the liquid return temperature, and obtain the real-time ambient temperature and battery working status data; Calculate the temperature difference: ΔT = T inlet -T outlet , where: T inlet is the inlet temperature, T outlet is the liquid return temperature; Calculate the average temperature: Where n is the number of single cells in the battery pack, T cell,i is the temperature of the nth single cell; When T avg With T ideal When the difference between T and TC exceeds the preset threshold, the cooling system is started and the PID control algorithm is used to adjust the output of the cooling system so that T avg With T ideal The difference is less than the preset threshold.

4. The control system according to claim 1, characterized in that: When the emergency mode is activated, it includes: Cut off all power output and input of the battery box, and stop charging and discharging; Quickly transfer the cooling liquid in other battery boxes to the high-temperature box to ensure that the high-temperature box is filled with cooling liquid; The cooling host runs at full power to cool the high-temperature box; After the cooling time reaches the preset time, the temperature is manually checked to decide whether to stop cooling; If no manual stop command is received, continue cooling and repeat the manual inspection process until a stop command is received.

5. The control system according to any one of claims 1 to 4, characterized in that: The circulation module also includes a pressure relief valve, a main valve, a liquid inlet valve, an explosion-proof valve, and a filter. The main valve is used to control the total flow of the liquid.

6. The control system according to any one of claims 1 to 4, characterized in that: The temperature sensors include a liquid inlet temperature sensor, a battery cell temperature sensor, an in-box ambient temperature sensor, and a liquid return temperature sensor, and each battery cell includes at least one battery cell temperature sensor.

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