Heat management control method for energy storage cabinet

Abstract

The invention discloses a heat management control method for an energy storage cabinet, and relates to the technical field of energy storage cabinets, the heat management control method is characterized in that a water chilling unit, a plurality of liquid cooling plates and an energy storage cabinet upper BMS control system are included, the water chilling unit is in communication connection with the plurality of liquid cooling plates, the plurality of liquid cooling plates are in communication connection with the energy storage cabinet upper BMS control system, and the plurality of liquid cooling plates are in communication connection with the energy storage cabinet upper BMS control system. The water chilling unit is in communication connection with the energy storage cabinet upper BMS control system; the water chilling unit comprises a refrigerant circulating flow path and a water circulating flow path; the refrigerant circulation flow path comprises a refrigeration compressor, a condenser, a throttle valve and an evaporator, the refrigeration compressor is connected with the condenser, the battery cell is provided with a temperature collection sensor, the temperature of the battery cell can be obtained in real time, data are fed back to the energy storage cabinet upper BMS control system, the system sends an instruction to the water chilling unit after information processing, and the energy storage cabinet upper BMS control system is used for controlling the water chilling unit to be cooled. And cold water, hot water or standby can be prepared, so that the temperature of the battery cell can be accurately regulated and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage cabinets, and more specifically, it relates to a thermal management control method for energy storage cabinets. Background Art

[0002] Energy storage cabinets are generally in the form of containers, and the charging and discharging electric powers are mostly 3-5 megawatts, commonly known as large energy storage. The functions of energy storage cabinets are as follows: for example, factories can turn on the charging mode to charge at night when the electricity cost is low, and turn on the discharging mode to provide electricity for factory equipment during the day when the electricity cost is high, reducing the electricity cost of production factories, which is also a new energy method encouraged by the state. During the charging-discharging process of the energy storage cabinet, the heat generated by the battery cells (batteries) in the PACK is relatively large, so it is necessary to cool the battery cells, that is, a thermal management temperature control system for energy storage is generated.

[0003] Currently, common thermal management methods for energy storage cabinets include air cooling and liquid cooling, etc. Although the air cooling method has a simple structure and low cost, its heat dissipation efficiency is limited, it is difficult to meet the heat dissipation requirements of high-power density energy storage systems, and there are deficiencies in temperature uniformity control. Compared with air cooling, the liquid cooling method has higher heat dissipation efficiency and better temperature uniformity, but existing liquid cooling systems often have problems with insufficiently refined control strategies. For example, it is impossible to accurately adjust the cooling or heating power according to the different working states (charging, discharging, standing still) of the energy storage cabinet and the real-time changes in the battery cell temperature, resulting in energy waste or poor temperature control effects. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a thermal management control method for energy storage cabinets.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A thermal management control method for energy storage cabinets includes a chiller, a plurality of liquid cooling plates, and an energy storage cabinet upper BMS control system. The chiller is communicatively connected to the plurality of liquid cooling plates, the plurality of liquid cooling plates are communicatively connected to the energy storage cabinet upper BMS control system, and the chiller is communicatively connected to the energy storage cabinet upper BMS control system; the chiller includes a refrigerant circulation flow path and a water circulation flow path;

[0007] The refrigerant circulation flow path includes a refrigeration compressor, a condenser, a throttle valve, and an evaporator. The refrigeration compressor is connected to the condenser, the condenser is connected to the throttle valve, the throttle valve is connected to the evaporator, and the refrigeration compressor is connected to the evaporator;

[0008] The water circulation path includes electric heating of the pipeline, a water pump, a return water temperature sensor, and an outlet water temperature sensor. The electric heating of the pipeline is connected between the water pump, and the electric heating of the pipeline is connected between the evaporator. The return water temperature sensor is installed at the return water end of the evaporator for detecting the return water temperature TH, and the outlet water temperature sensor is installed at the outlet end of the water pump for detecting the outlet water temperature TK;

[0009] Several energy storage PACKs are provided inside several liquid cooling plates. Several energy storage PACKs are provided with several battery cells, and temperature acquisition sensors are provided on the battery cells. The water circulation path of the chiller is connected to several liquid cooling plates for cooling or heating regulation of the energy storage PACKs inside the several liquid cooling plates;

[0010] The upper BMS system of the energy storage cabinet is communicatively connected to the control part of the chiller, and the upper BMS system of the energy storage cabinet is communicatively connected to the temperature acquisition sensors of the battery cells. The temperature acquisition sensors send the acquired battery cell temperatures to the upper BMS system of the energy storage cabinet. After information processing, the upper BMS system of the energy storage cabinet sends an instruction to the control part of the chiller to refrigerate water or heat water or standby. The chilled water in the chiller circulates in the liquid cooling plates to cool or heat the battery cells, and the temperature acquisition sensors feedback the temperature of the battery cells to the upper BMS system of the energy storage cabinet to continue heating or cooling.

[0011] Preferably, the following steps are further included:

[0012] Perform a power-on operation on the energy storage cabinet and make the chiller enter the startup mode. The upper BMS control system of the energy storage cabinet is used to detect whether the energy storage cabinet is in a charging state, a discharging state, or a stationary state;

[0013] When the energy storage cabinet is in a charging state, a discharging state, or a stationary state, control the chiller according to the outlet water temperature TK;

[0014] Dynamically adjust the refrigeration or heating power of the chiller according to the change rate of the battery cell temperature.

[0015] Preferably, when the energy storage cabinet is in a charging state, control the chiller according to the outlet water temperature TK, which specifically includes the following steps:

[0016] Respectively compare the outlet water temperature TK with a preset first outlet water temperature threshold T1 and a preset second outlet water temperature threshold T2;

[0017] If the outlet water temperature TK ≥ the preset first outlet water temperature threshold T1, the chiller turns on the refrigeration mode to cool down, and dynamically adjusts the refrigeration power of the chiller according to the change rate of the battery cell temperature;

[0018] If the preset second outlet water temperature threshold T2 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, the chiller is turned off and there is no need to operate in the cooling mode or heating mode, and the water pump is turned on and operates;

[0019] If the outlet water temperature TK ≤ the preset second outlet water temperature threshold T2, the chiller turns on the heating mode to make the pipeline electric heating work and the pipeline electric heating is in the state of making hot water, and the heating power of the chiller is dynamically adjusted according to the change rate of the core temperature.

[0020] Preferably, when the energy storage cabinet is in the discharging state, the chiller is controlled according to the outlet water temperature TK, which specifically includes the following steps:

[0021] Compare the outlet water temperature TK with the preset first outlet water temperature threshold T1, the preset third outlet water temperature threshold T3, and the preset fifth outlet water temperature threshold T5 respectively;

[0022] If the outlet water temperature TK ≥ the preset first outlet water temperature threshold T1, the chiller turns on the cooling mode to cool down until the outlet water temperature TK ≤ the preset third outlet water temperature threshold T3 within a predetermined time period, then the chiller is turned off, and the water pump is turned on and operates, and the cooling power of the chiller is dynamically adjusted according to the change rate of the core temperature;

[0023] If the preset third outlet water temperature threshold T3 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, the chiller turns on the cooling mode to cool down until the outlet water temperature TK ≤ the preset third outlet water temperature threshold T3 within a predetermined time period, then the chiller is turned off, and the water pump operates;

[0024] If the preset fifth outlet water temperature threshold T5 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, the water pump operates, and the chiller does not need to operate in the cooling mode or heating mode;

[0025] If the outlet water temperature TK ≤ the preset fifth outlet water temperature threshold T5, the chiller turns on the heating mode, and the heating power of the chiller is dynamically adjusted according to the change rate of the core temperature.

[0026] Preferably, when the energy storage cabinet is in the static state, the chiller is controlled according to the outlet water temperature TK, which specifically includes the following steps:

[0027] Compare the outlet water temperature TK with the preset sixth outlet water temperature threshold T7 and the preset seventh outlet water temperature threshold T7 respectively;

[0028] If the outlet water temperature TK ≥ the preset sixth outlet water temperature threshold T7, the chiller turns on the cooling mode to cool down, and the cooling power of the chiller is dynamically adjusted according to the change rate of the core temperature;

[0029] When the preset seventh outlet water temperature threshold T8 < the outlet water temperature TK < the preset sixth outlet water temperature threshold T7, the chiller is turned off and the water pump starts to work;

[0030] When the outlet water temperature TK ≤ the preset seventh outlet water temperature threshold T7, the chiller turns on the heating mode and dynamically adjusts the heating power of the chiller according to the change rate of the cell temperature.

[0031] Preferably, dynamically adjusting the cooling or heating power of the chiller according to the change rate of the cell temperature specifically includes the following steps:

[0032] When the chiller is in the heating mode, compare the change rate of the cell temperature with the preset first temperature change rate threshold;

[0033] When the change rate of the cell temperature is greater than the preset first temperature change rate threshold, increase the heating power of the chiller;

[0034] When the change rate of the cell temperature is less than the preset first temperature change rate threshold, decrease the heating power of the chiller;

[0035] When the chiller is in the cooling mode, compare the change rate of the cell temperature with the preset second temperature change rate threshold;

[0036] When the change rate of the cell temperature is greater than the preset second temperature change rate threshold, increase the cooling power of the chiller;

[0037] When the change rate of the cell temperature is less than the preset second temperature change rate threshold, decrease the cooling power of the chiller.

[0038] Preferably, it further includes the following steps:

[0039] A water quality monitoring sensor is also provided in the water circulation flow path of the chiller. The water quality monitoring sensor is used to monitor the water quality of the circulating water in real time. When the water quality does not meet the preset standard, the upper BMS control system of the energy storage cabinet controls the purification device to purify the circulating water.

[0040] Preferably, it further includes the following steps:

[0041] The upper BMS control system of the energy storage cabinet is also used to monitor the operating parameters of the system in real time. When abnormal parameters are detected, it determines that a fault has occurred and issues an alarm signal.

[0042] Preferably, the upper BMS control system of the energy storage cabinet is also used to monitor the operating parameters of the system in real time. When abnormal parameters are detected, it determines that a fault has occurred and issues an alarm signal, specifically including the following steps:

[0043] Determine whether the refrigeration compressor is faulty based on the abnormal current of the refrigeration compressor, determine whether the water pump is faulty based on the pressure change of the water circulation flow path of the water pump, and determine whether the pipeline electric heating is faulty based on the power consumption of the pipeline electric heating.

[0044] Preferably, determine whether the refrigeration compressor is faulty based on the abnormal current of the refrigeration compressor, determine whether the water pump is faulty based on the pressure change of the water circulation flow path of the water pump, and determine whether the pipeline electric heating is faulty based on the power consumption of the pipeline electric heating. Specifically, it includes the following steps:

[0045] Compare the current of the refrigeration compressor with the standard current. If the current of the refrigeration compressor does not belong to the standard current, it is determined that the refrigeration compressor has a fault;

[0046] Compare the pressure of the water circulation flow path of the water pump with the standard pressure. If the pressure of the water circulation flow path of the water pump does not belong to the standard pressure, the water pump has a fault;

[0047] Compare the power consumption of the pipeline electric heating with the standard power. If the power consumption of the pipeline electric heating does not belong to the standard power, the pipeline electric heating has a fault.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] A temperature acquisition sensor is provided on the battery cell to obtain the battery cell temperature in real time and feed the data back to the upper BMS control system of the energy storage cabinet. After information processing, this system sends an instruction to the chiller to make cold water, hot water or standby, so as to achieve precise control of the battery cell temperature. For example, when the battery cell temperature is too high, the chiller makes cold water, and the cold water circulates in the liquid cooling plate through the water circulation flow path to achieve temperature reduction; when the temperature is too low, hot water is made for heating up, ensuring that the battery cell is always in a suitable working temperature range, and improving the stability and reliability of the energy storage system.

[0050] Communication connections are established among the chiller, several liquid cooling plates and the upper BMS control system of the energy storage cabinet to form an organic whole. As the control center, the upper BMS control system of the energy storage cabinet can monitor and control the operation of the entire system in real time, and intelligently adjust the working state of the chiller according to the battery cell temperature and other relevant parameters, realizing intelligent and automatic control of the energy storage cabinet thermal management, reducing the cost of manual intervention, and improving the system management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram in a thermal management control method for an energy storage cabinet proposed by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0052] Refer to Figure 1 as shown.

[0053] Embodiment 1 further illustrates a thermal management control method for an energy storage cabinet proposed by the present invention.

[0054] A thermal management control method for an energy storage cabinet includes a chiller 100, a number of liquid cooling plates 200, and an upper BMS control system 300 of the energy storage cabinet. The chiller 100 is communicatively connected to the number of liquid cooling plates 200, the number of liquid cooling plates 200 is communicatively connected to the upper BMS control system 300 of the energy storage cabinet, and the chiller 100 is communicatively connected to the upper BMS control system 300 of the energy storage cabinet; the chiller 100 includes a refrigerant circulation flow path and a water circulation flow path (50% ethylene glycol aqueous solution);

[0055] The refrigerant circulation flow path includes a refrigeration compressor 101, a condenser 102, a throttle valve 103, and an evaporator 104. The refrigeration compressor 101 is connected to the condenser 102, the condenser 102 is connected to the throttle valve 103, the throttle valve 103 is connected to the evaporator 104, and the refrigeration compressor 101 is connected to the evaporator 104;

[0056] The water circulation flow path includes a pipeline electric heater 105, a water pump 106, a return water temperature sensor 107, and a water outlet temperature sensor 108. The pipeline electric heater 105 is connected to the water pump 106, the pipeline electric heater 105 is connected to the evaporator 104, the return water temperature sensor 107 is installed at the return water end of the evaporator 104 for detecting the return water temperature TH, and the water outlet temperature sensor 108 is installed at the water outlet end of the water pump 106 for detecting the water outlet temperature TK;

[0057] A number of energy storage PACKs are provided inside the number of liquid cooling plates 200, a number of battery cells are provided in the number of energy storage PACKs, temperature acquisition sensors are provided on the battery cells, and the water circulation flow path of the chiller 100 is connected to the number of liquid cooling plates 200 for cooling or heating regulation of the energy storage PACKs inside the number of liquid cooling plates 200;

[0058] The upper BMS system 300 of the energy storage cabinet is communicatively connected to the control part of the chiller 100, and the upper BMS system 300 of the energy storage cabinet is communicatively connected to the temperature acquisition sensors of the battery cells. The temperature acquisition sensors send the obtained battery cell temperatures to the upper BMS system 300 of the energy storage cabinet. After information processing, the upper BMS system 300 of the energy storage cabinet sends instructions to the control part of the chiller 100 to refrigerate water or heat water or standby. The cold water in the chiller 100 circulates in the liquid cooling plates 200 to realize temperature reduction or increase of the battery cells, and the temperature acquisition sensors feedback the temperatures of the battery cells to the upper BMS system 300 of the energy storage cabinet to continue heating or cooling.

[0059] In this application, the chiller 100 is the core equipment for thermal management, including a refrigerant circulation flow path and a water circulation flow path. The refrigerant circulation flow path realizes a refrigeration cycle to prepare refrigerant through a refrigeration compressor 101, a condenser 102, a throttle valve 103, and an evaporator 104; the water circulation flow path exchanges heat with the refrigerant to provide circulating water for cooling or heating the liquid cooling plate, thereby controlling the temperature of the energy storage PACK.

[0060] Several liquid cooling plates 200 are internally provided with energy storage PACKs, and the PACKs contain battery cells. The liquid cooling plate 200 is a place where the battery cells exchange heat with the circulating water. The circulating water flows therein to take away or provide heat, realizing the cooling or heating of the battery cells and maintaining the appropriate working temperature of the battery cells.

[0061] The upper-level BMS control system 300 of the energy storage cabinet, as the control center of the system, is communicatively connected to the chiller 100, the liquid cooling plate 200, and the temperature acquisition sensors of the battery cells. It receives the battery cell temperature information sent by the temperature acquisition sensors, and after processing, sends instructions to the control part of the chiller 100 to control its refrigeration, heating, or standby state, realizing precise control of the thermal management of the energy storage system.

[0062] The refrigeration compressor 101 compresses the refrigerant in the refrigerant circulation flow path, increasing the pressure and temperature of the refrigerant and providing power for the refrigeration cycle. The condenser 102 dissipates heat and condenses the high-temperature and high-pressure refrigerant, releasing the heat to the external environment and changing the refrigerant from a gaseous state to a liquid state. The throttle valve 103 throttles and reduces the pressure of the liquid refrigerant, making it into a low-temperature and low-pressure liquid refrigerant to prepare for the endothermic evaporation of the evaporator. In the evaporator 104, the low-temperature and low-pressure liquid refrigerant absorbs heat and evaporates, exchanging heat with the water in the water circulation flow path, thereby realizing the refrigeration or heating of the water.

[0063] The pipeline electric heater 105 is in the water circulation flow path. When it is necessary to heat the water, the pipeline electric heater works to provide heat for the water, raising the temperature of the water to meet the demand for heating the battery cells. The water pump 106 provides power for the water in the water circulation flow path, pushing the water to flow in the pipeline and circulating it between the evaporator and the liquid cooling plate to realize heat transfer.

[0064] The return water temperature sensor 107 is installed at the return water end of the evaporator 104 and is used to detect the return water temperature TH, providing temperature feedback information for system control to adjust the temperature of the water circulation.

[0065] The outlet water temperature sensor 108 is installed at the outlet water end of the water pump 106 and is used to detect the outlet water temperature TK, also providing temperature feedback information for system control to assist the system in precisely controlling the water temperature and the thermal management process.

[0066] The temperature acquisition sensor is installed on the battery cell to collect the temperature information of the battery cell in real time and send the temperature data to the upper BMS control system 300 of the energy storage cabinet, providing a basis for the system to make thermal management decisions.

[0067] The upper BMS control system of the energy storage cabinet processes and analyzes the received temperature information to determine whether the battery cell temperature is within the set reasonable range. If the temperature is too high, it sends an instruction to the control part of the chiller to make cold water; if the temperature is too low, it sends an instruction to make hot water; if the temperature is appropriate, it sends a standby instruction.

[0068] The water circulation path of the chiller 100 includes components such as the pipe electric heater 105, the water pump 106, the return water temperature sensor 107, and the outlet water temperature sensor 108. When receiving the refrigeration or heating instruction, the refrigerant circulation path in the chiller 100 works first, and the refrigeration compressor 101, the condenser 102, the throttle valve 103, and the evaporator 104 work together to prepare the refrigerant with the corresponding temperature. The refrigerant exchanges heat with the water in the water circulation path, and the water enters the liquid cooling plate and circulates under the action of the water pump 106. If it is cold water, it can take away the heat of the energy storage PACK to achieve the temperature reduction of the battery cell; if it is hot water, it heats the energy storage PACK to achieve the temperature increase of the battery cell.

[0069] The return water temperature sensor 107 and the outlet water temperature sensor 108 respectively detect the water temperature at the return end of the evaporator and the outlet end of the water pump. At the same time, the temperature acquisition sensor continuously feeds back the battery cell temperature to the upper BMS control system of the energy storage cabinet, and the system further adjusts the working state of the chiller according to the feedback information to continuously heat or cool the battery cell to maintain the battery cell temperature within a suitable range.

[0070] Embodiment 2

[0071] On the basis of Embodiment 1, the following technical features are added: The following steps are also included:

[0072] Perform a power-on operation on the energy storage cabinet and make the chiller 100 enter the startup mode. The upper BMS control system 300 of the energy storage cabinet is used to detect whether the energy storage cabinet is in the charging state, the discharging state, or the static state;

[0073] When the energy storage cabinet is in the charging state, the discharging state, or the static state, control the chiller 100 according to the outlet water temperature TK;

[0074] Dynamically adjust the refrigeration or heating power of the chiller 100 according to the change rate of the battery cell temperature.

[0075] Power on the energy storage cabinet, and at the same time, start the chiller 100 in the startup mode, and the system starts to run. The upper BMS control system 300 of the energy storage cabinet continuously detects the state of the energy storage cabinet, and judges whether it is in the charging state, discharging state or static state. When the energy storage cabinet is in any of the above three states, the upper BMS control system 300 of the energy storage cabinet controls the chiller 100 according to the outlet water temperature TK detected by the outlet water temperature sensor 108. For example, if the outlet water temperature is too high and the energy storage cabinet is in the charging state, it may be necessary to increase the refrigeration power of the chiller to ensure that the battery cells will not be affected in terms of performance and lifespan due to excessive temperature during charging; if the outlet water temperature is too low and in the discharging state, it may be necessary to appropriately increase the heating power of the chiller.

[0076] The temperature acquisition sensors on the battery cells continuously monitor the battery cell temperature and send the temperature data to the upper BMS control system 300 of the energy storage cabinet. The system calculates the change rate of the battery cell temperature. If the change rate is large, it means that the battery cell temperature changes rapidly and may soon exceed the appropriate operating temperature range. At this time, the system will dynamically adjust the refrigeration or heating power of the chiller 100. For example, when the change rate of the battery cell temperature is positive and the value is large, it indicates that the battery cell temperature is rising rapidly, and the system will increase the refrigeration power of the chiller; if the change rate is negative and the value is large, it means that the battery cell temperature is dropping rapidly, then appropriately increase the heating power to maintain the stability of the battery cell temperature.

[0077] Embodiment III

[0078] Based on Embodiment II, add the following technical features: when the energy storage cabinet is in the charging state, control the chiller 100 according to the outlet water temperature TK, which specifically includes the following steps:

[0079] Compare the outlet water temperature TK with the preset first outlet water temperature threshold T1 (30°C) and the preset second outlet water temperature threshold T2 (16°C) respectively;

[0080] If the outlet water temperature TK ≥ the preset first outlet water temperature threshold T1, then the chiller 100 turns on the refrigeration mode to cool down, and dynamically adjusts the refrigeration power of the chiller 100 according to the change rate of the battery cell temperature;

[0081] If the preset second outlet water temperature threshold T2 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, then the chiller 100 is turned off and there is no need to perform the refrigeration mode or heating mode, and the water pump 106 is turned on to work;

[0082] If the outlet water temperature TK ≤ the preset second outlet water temperature threshold T2, then the chiller 100 turns on the heating mode to make the pipeline electric heater 105 work and the pipeline electric heater 105 is in the state of producing hot water, and dynamically adjusts the heating power of the chiller 100 according to the change rate of the battery cell temperature.

[0083] When the energy storage cabinet is powered on, the chiller 100 enters the startup mode. The upper BMS control system 300 of the energy storage cabinet detects whether the energy storage cabinet is in the charge-discharge state. When the energy storage cabinet is in the non-discharge state, i.e., the charging state. When the starting outlet water temperature TK ≥ 30°C (charging refrigeration setting) lasts for 3 seconds, the BMS commands the chiller to turn on the refrigeration mode to cool down until the outlet water temperature TK ≤ 25°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. If the outlet water temperature TK > 25°C, the BMS commands the chiller water to continue to turn on the refrigeration mode to cool down. The chiller is always in the state of making cold water until the outlet water temperature TK ≤ 25°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. When 16°C < the outlet water temperature TK < 30°C, only the water pump circulates, and there is no need for refrigeration or heating. When the outlet water temperature TK ≤ 16°C (charging heating setting) lasts for 3 seconds, the BMS commands the cold water to turn on the hot water production mode and the pipeline electric heating is turned on. When the outlet water temperature TK ≥ 22°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates. If the outlet water temperature TK < 22°C, the BMS commands the chiller to turn on the hot water production mode to heat up. The pipeline electric heating is always in the state of making hot water. Until the outlet water temperature TK ≥ 22°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates.

[0084] Embodiment 4

[0085] On the basis of Embodiment 3, the following technical features are added: When the energy storage cabinet is in the discharge state, the chiller 100 is controlled according to the outlet water temperature TK, which specifically includes the following steps:

[0086] The outlet water temperature TK is respectively compared with a preset first outlet water temperature threshold T1 (30°C), a preset third outlet water temperature threshold T3 (25°C), and a preset fifth outlet water temperature threshold T5 (12°C);

[0087] If the outlet water temperature TK ≥ the preset first outlet water temperature threshold T1, the chiller 100 turns on the refrigeration mode to cool down until the outlet water temperature TK ≤ the preset third outlet water temperature threshold T3 25 within a predetermined time period, then the chiller 100 is turned off, and the water pump 106 starts to work, and the refrigeration power of the chiller 100 is dynamically adjusted according to the change rate of the cell temperature;

[0088] If the preset third outlet water temperature threshold T3 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, the chiller 100 turns on the refrigeration mode to cool down until the outlet water temperature TK ≤ the preset third outlet water temperature threshold T3 25 within a predetermined time period, then the chiller 100 is turned off, and the water pump 106 works;

[0089] When the preset fifth outlet water temperature threshold T5 < the outlet water temperature TK < the preset first outlet water temperature threshold T1, the water pump 106 operates, and the chiller 100 does not need to operate in the cooling mode or the heating mode;

[0090] If the outlet water temperature TK ≤ the preset fifth outlet water temperature threshold T5, the chiller 100 turns on the heating mode and dynamically adjusts the heating power of the chiller 100 according to the change rate of the cell temperature.

[0091] When the initial outlet water temperature TK ≧ 30°C (discharge cooling setting) lasts for 3 seconds, the BMS commands the chiller to turn on the cooling mode to cool down until the outlet water temperature TK ≦ 25°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. If the outlet water temperature TK > 25°C, the BMS commands the chiller to continue to turn on the cooling mode to cool down. The chiller is always in the state of making cold water until the outlet water temperature TK ≦ 25°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. When the initial 6°C < the outlet water temperature TK < 30°C, only the water pump circulates and there is no need for cooling or heating. When the outlet water temperature TK ≦ 6°C (discharge heating setting) lasts for 3 seconds, the BMS commands the chiller to turn on the hot water production mode and the pipeline electric heating is turned on. When the outlet water temperature TK ≧ 12°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates. If the outlet water temperature TK < 12°C, the BMS commands the chiller to turn on the hot water production mode to heat up. The pipeline electric heating is always in the state of making hot water. Until the outlet water temperature TK ≧ 12°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates.

[0092] Embodiment Five

[0093] On the basis of Embodiment Four, the following technical features are added: When the energy storage cabinet is in a static state, the chiller 100 is controlled according to the outlet water temperature TK, which specifically includes the following steps:

[0094] Compare the outlet water temperature TK with the preset sixth outlet water temperature threshold T7 (28°C) and the preset seventh outlet water temperature threshold T8 (12°C) respectively;

[0095] If the outlet water temperature TK ≥ the preset sixth outlet water temperature threshold T7, the chiller 100 turns on the cooling mode to cool down and dynamically adjusts the cooling power of the chiller 100 according to the change rate of the cell temperature;

[0096] When the preset seventh outlet water temperature threshold T8 < the outlet water temperature TK < the preset sixth outlet water temperature threshold T7, the chiller 100 is turned off and the water pump 106 starts to operate;

[0097] When the outlet water temperature TK ≤ the preset seventh outlet water temperature threshold T7, the chiller 100 turns on the heating mode and dynamically adjusts the heating power of the chiller 100 according to the change rate of the cell temperature.

[0098] When the initial outlet water temperature TK ≥ 36°C (standing refrigeration setting) lasts for 3 seconds, the BMS commands the chiller to turn on the refrigeration mode for cooling until the outlet water temperature TK ≤ 28°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. If the outlet water temperature TK > 28°C, the BMS commands the chiller to continue to turn on the refrigeration mode for cooling. The chiller is always in the state of making cold water until the outlet water temperature TK ≤ 28°C lasts for 3 seconds (i.e., the chiller outlet water temperature), then the chiller is turned off and only the water pump circulates. When 12°C < the outlet water temperature TK < 30°C, only the water pump circulates and there is no need for refrigeration or heating. When the outlet water temperature TK ≤ 12°C (standing heating setting) lasts for 3 seconds, the BMS commands the cold water to turn on the hot water production mode and the pipeline electric heating is turned on. When the outlet water temperature TK ≥ 18°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates. If the outlet water temperature TK < 18°C, the BMS commands the chiller to turn on the hot water production mode for heating up. The pipeline electric heating is always in the state of making hot water. Until the outlet water temperature TK ≥ 18°C lasts for 3 seconds, the electric heating is turned off and only the water pump circulates.

[0099] Dynamically adjust the refrigeration or heating power of the chiller 100 according to the change rate of the cell temperature, specifically including the following steps:

[0100] When the chiller 100 is in the heating mode, compare the change rate of the cell temperature with the preset first temperature change rate threshold;

[0101] When the change rate of the cell temperature is greater than the preset first temperature change rate threshold, increase the heating power of the chiller 100;

[0102] When the change rate of the cell temperature is less than the preset first temperature change rate threshold, decrease the heating power of the chiller 100;

[0103] When the chiller 100 is in the refrigeration mode, compare the change rate of the cell temperature with the preset second temperature change rate threshold;

[0104] When the change rate of the cell temperature is greater than the preset second temperature change rate threshold, increase the refrigeration power of the chiller 100;

[0105] When the change rate of the cell temperature is less than the preset second temperature change rate threshold, decrease the refrigeration power of the chiller 100.

[0106] The temperature acquisition sensor on the battery cell continuously and real-time acquires the battery cell temperature data and transmits it to the upper BMS control system 300 of the energy storage cabinet. This system analyzes and calculates the continuous temperature data to obtain the change rate of the battery cell temperature.

[0107] Power adjustment in the heating mode: When the chiller 100 is in the heating mode, the upper BMS control system 300 of the energy storage cabinet compares the calculated change rate of the battery cell temperature with a preset first temperature change rate threshold.

[0108] If the change rate of the battery cell temperature is greater than the preset first temperature change rate threshold, it indicates that the battery cell temperature is rising relatively fast. In order to increase the temperature faster to meet the working requirements of the battery cell, the system will increase the heating power of the chiller 100 to speed up the heating speed.

[0109] If the change rate of the battery cell temperature is less than the preset first temperature change rate threshold, it means that the battery cell temperature is rising relatively slowly. At this time, the system will reduce the heating power of the chiller 100 to avoid energy waste caused by overheating.

[0110] Power adjustment in the cooling mode: When the chiller 100 is in the cooling mode, the upper BMS control system 300 of the energy storage cabinet compares the change rate of the battery cell temperature with a preset second temperature change rate threshold.

[0111] If the change rate of the battery cell temperature is greater than the preset second temperature change rate threshold, it means that the battery cell temperature is dropping relatively fast. In order to reduce the temperature more quickly, the system will increase the cooling power of the chiller 100.

[0112] If the change rate of the battery cell temperature is less than the preset second temperature change rate threshold, it indicates that the battery cell temperature is dropping relatively slowly. The system will then reduce the cooling power of the chiller 100 to save energy.

[0113] Embodiment Six

[0114] Based on Embodiment Five, the following technical features are added: The following steps are further included:

[0115] A water quality monitoring sensor 109 is further provided in the water circulation flow path of the chiller 100. The water quality monitoring sensor 109 is used to monitor the water quality of the circulating water in real time. When the water quality does not meet the preset standard, the upper BMS control system 300 of the energy storage cabinet controls the purification device to purify the circulating water.

[0116] The water quality monitoring sensor 109 is installed in the water circulation flow path of the chiller 100 to monitor the water quality of the circulating water in real time and obtain water quality parameter information such as pH value, impurity content, conductivity, etc. The water quality monitoring sensor 109 transmits the real-time monitored water quality parameter information to the upper BMS control system 300 of the energy storage cabinet. This system compares and judges the received water quality parameters with the preset water quality standards. If the water quality parameters do not meet the preset standards, indicating that the water quality of the circulating water is poor, the upper BMS control system 300 of the energy storage cabinet will issue a control instruction to start the purification device to purify the circulating water. The purification device removes impurities and harmful substances in the water through filtration, ion exchange, disinfection, etc., adjusts the water quality parameters, and makes the circulating water meet the preset water quality standards. The treated circulating water continues to participate in heat exchange in the water circulation flow path, providing a stable and reliable cooling or heating medium for the thermal management of the battery cells.

[0117] It also includes the following steps:

[0118] The upper BMS control system 300 of the energy storage cabinet is also used to monitor the operating parameters of the system in real time. When abnormal parameters are detected, it determines that a fault has occurred and issues an alarm signal.

[0119] The upper BMS control system 300 of the energy storage cabinet is also used to monitor the operating parameters of the system in real time. When abnormal parameters are detected, it determines that a fault has occurred and issues an alarm signal, specifically including the following steps:

[0120] Judge whether the refrigeration compressor 101 is faulty according to the abnormal current of the refrigeration compressor 101, judge whether the water pump 106 is faulty according to the pressure change of the water circulation flow path of the water pump 106, and judge whether the pipeline electric heater 105 is faulty according to the power consumption of the pipeline electric heater 105.

[0121] Judge whether the refrigeration compressor 101 is faulty according to the abnormal current of the refrigeration compressor 101, judge whether the water pump 106 is faulty according to the pressure change of the water circulation flow path of the water pump 106, and judge whether the pipeline electric heater 105 is faulty according to the power consumption of the pipeline electric heater 105, specifically including the following steps:

[0122] Compare the current of the refrigeration compressor 101 with the standard current. If the current of the refrigeration compressor 101 does not belong to the standard current, it is determined that the refrigeration compressor 101 has a fault;

[0123] Compare the pressure of the water circulation flow path of the water pump 106 with the standard pressure. If the pressure of the water circulation flow path of the water pump 106 does not belong to the standard pressure, the water pump 106 has a fault;

[0124] Compare the power consumption of the pipeline electric heater 105 with the standard power. If the power consumption of the pipeline electric heater 105 does not belong to the standard power, the pipeline electric heater 105 has a fault.

[0125] The upper BMS control system 300 of the energy storage cabinet real-time collects operation parameters such as the current of the refrigeration compressor 101, the pressure of the water circulation flow path of the water pump 106, and the power consumption of the pipeline electric heater 105. These parameters are real-time detected by corresponding sensors (such as current sensors, pressure sensors, power sensors, etc.), and the data is transmitted to the upper BMS control system 300 of the energy storage cabinet.

[0126] The upper BMS control system 300 of the energy storage cabinet compares the current of the refrigeration compressor 101 collected with the preset standard current. If the current of the refrigeration compressor 101 is not within the standard current range, it indicates that its operation state is abnormal, and it is determined that the refrigeration compressor 101 has a fault. For example, too large a current may indicate problems such as overloading of the compressor or internal short circuit; too small a current may mean that the compressor fails to start normally or there are mechanical jamming and other faults.

[0127] The system compares the pressure of the water circulation flow path of the water pump 106 with the standard pressure. If the pressure of the water circulation flow path of the water pump 106 deviates from the standard pressure, that is, it does not belong to the standard pressure range, it is determined that the water pump 106 has a fault. Abnormal pressure may be caused by reasons such as damage to the water pump impeller, pipeline blockage, valve failure, etc., affecting the normal progress of water circulation and further affecting the thermal management effect.

[0128] The upper BMS control system 300 of the energy storage cabinet compares the power consumption of the pipeline electric heater 105 with the standard power. When the power consumption of the pipeline electric heater 105 does not conform to the standard power, it is determined that the pipeline electric heater 105 has a fault. Abnormal power may be caused by factors such as damage to the heating element, control circuit failure, etc., affecting the normal realization of the heating function.

[0129] Once it is determined that components such as the refrigeration compressor 101, the water pump 106, or the pipeline electric heater 105 have faults, the upper BMS control system 300 of the energy storage cabinet immediately issues an alarm signal to notify the operation and maintenance personnel that the system has a fault, so as to conduct inspections and repairs in a timely manner.

[0130] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solutions, in essence, or the part that makes contributions to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal management control method for an energy storage cabinet, comprising a water chiller (100), a plurality of liquid cooling plates (200) and an upper BMS control system (300) for the energy storage cabinet, wherein the water chiller (100) and the plurality of liquid cooling plates (200) are communicatively connected, the plurality of liquid cooling plates (200) and the upper BMS control system (300) for the energy storage cabinet are communicatively connected, and the water chiller (100) and the upper BMS control system (300) for the energy storage cabinet are communicatively connected; characterized in that: The chiller (100) comprises a refrigerant circulation flow path and a water circulation flow path; The refrigerant circulation flow path comprises a refrigeration compressor (101), a condenser (102), a throttle valve (103) and an evaporator (104); the refrigeration compressor (101) and the condenser (102) are connected, the condenser (102) and the throttle valve (103) are connected, the throttle valve (103) and the evaporator (104) are connected, and the refrigeration compressor (101) and the evaporator (104) are connected; The water circulation flow path comprises a pipeline electric heater (105), a water pump (106), a return water temperature sensor (107) and an outlet water temperature sensor (108); the pipeline electric heater (105) and the water pump (106) are connected, the pipeline electric heater (105) and the evaporator (104) are connected, the return water temperature sensor (107) is installed at the return water end of the evaporator (104) to detect the return water temperature TH, and the outlet water temperature sensor (108) is installed at the outlet water end of the water pump (106) to detect the outlet water temperature TK; A plurality of energy storage PACK packages are arranged inside the plurality of liquid cooling plates (200), the plurality of energy storage PACK packages are provided with a plurality of battery cells, and the battery cells are provided with temperature collection sensors. The water circulation flow path of the water chiller (100) is connected to the plurality of liquid cooling plates (200) and is used to perform cooling or heating control on the energy storage PACK packages in the plurality of liquid cooling plates (200); The energy storage cabinet BMS system (300) is communicatively connected to the control part of the water chiller (100), and the energy storage cabinet BMS system (300) is communicatively connected to the temperature acquisition sensor of the battery cell. The temperature acquisition sensor sends the acquired battery cell temperature to the energy storage cabinet BMS system (300). After information processing, the energy storage cabinet BMS system (300) sends an instruction to the control part of the water chiller (100) to cool water or make hot water or to standby. The cold water in the water chiller (100) circulates in the liquid cooling plate (200) to cool or heat the battery cell. The temperature acquisition sensor feeds back the temperature of the battery cell to the energy storage cabinet BMS system (300) to continue heating or cooling.

2. The energy storage cabinet thermal management control method according to claim 1, characterized in that: The following steps are also included: The energy storage cabinet is powered on, and the chiller (100) is put into a startup mode, and the upper BMS control system (300) of the energy storage cabinet is used to detect whether the energy storage cabinet is in a charging state, a discharging state, or a static state; When the energy storage cabinet is in a charging state, a discharging state, or a static state, the chiller (100) is controlled according to the outlet water temperature TK; The cooling or heating power of the chiller (100) is dynamically adjusted according to the rate of change of the battery core temperature.

3. The energy storage cabinet thermal management control method according to claim 2, characterized in that: When the energy storage cabinet is in a charging state, the chiller (100) is controlled according to the outlet water temperature TK, specifically comprising the following steps: The water outlet temperature TK is respectively compared with a preset first water outlet temperature threshold T1 and a preset second water outlet temperature threshold T2; If the outlet water temperature TK is greater than or equal to a preset first outlet water temperature threshold value T1, the chiller (100) starts a refrigeration mode to cool the temperature, and dynamically adjusts the refrigeration power of the chiller (100) according to the rate of change of the battery core temperature; If the preset second outlet water temperature threshold value T2 is less than the outlet water temperature TK and less than the preset first outlet water temperature threshold value T1, the chiller (100) is turned off without the need to perform cooling mode or heating mode, and the water pump (106) is turned on; If the outlet water temperature TK is less than or equal to the preset second outlet water temperature threshold value T2, the chiller (100) turns on the heating mode to make the pipeline electric heater (105) work so that the pipeline electric heater (105) is in a hot water production state, and the heating power of the chiller (100) is dynamically adjusted according to the rate of change of the battery core temperature.

4. The energy storage cabinet thermal management control method according to claim 2, characterized in that: When the energy storage cabinet is in a discharging state, the chiller (100) is controlled according to the outlet water temperature TK, specifically comprising the following steps: The outlet water temperature TK is compared with a preset first outlet water temperature threshold T1, a preset third outlet water temperature threshold T3 and a preset fifth outlet water temperature threshold T5 respectively; If the outlet water temperature TK is greater than or equal to a preset first outlet water temperature threshold value T1, the chiller (100) starts a cooling mode to cool down the temperature until the outlet water temperature TK is less than or equal to a preset third outlet water temperature threshold value T3 (25) within a predetermined time period, after which the chiller (100) is turned off and the water pump (106) is started to work, and the cooling power of the chiller (100) is dynamically adjusted according to the rate of change of the battery core temperature; If the preset third outlet water temperature threshold value T3 is less than the outlet water temperature TK and less than the preset first outlet water temperature threshold value T1, the chiller (100) starts the cooling mode to cool down the water until the outlet water temperature TK is less than or equal to the preset third outlet water temperature threshold value T3 (25) within a predetermined time period, then the chiller (100) is turned off and the water pump (106) is operated; If the preset fifth outlet water temperature threshold value T5 is less than the outlet water temperature TK and less than the preset first outlet water temperature threshold value T1, the water pump (106) works and the chiller (100) does not need to be in cooling mode or heating mode; If the outlet water temperature TK is less than or equal to the preset fifth outlet water temperature threshold value T5, the chiller (100) starts the heating mode and dynamically adjusts the heating power of the chiller (100) according to the rate of change of the battery core temperature.

5. The energy storage cabinet thermal management control method according to claim 2, characterized in that: When the energy storage cabinet is in a static state, the chiller (100) is controlled according to the outlet water temperature TK, specifically comprising the following steps: The outlet water temperature TK is compared with the preset sixth outlet water temperature threshold T7 and the preset seventh outlet water temperature threshold T7 respectively; If the outlet water temperature TK is greater than or equal to a preset sixth outlet water temperature threshold value T7, the chiller (100) starts a refrigeration mode to cool the temperature, and dynamically adjusts the refrigeration power of the chiller (100) according to the rate of change of the battery core temperature; When the preset seventh outlet water temperature threshold value T8 is less than the outlet water temperature TK and less than the preset sixth outlet water temperature threshold value T7, the chiller (100) is turned off and the water pump (106) is turned on; When the outlet water temperature TK is less than or equal to the preset seventh outlet water temperature threshold value T7, the chiller (100) starts the heating mode and dynamically adjusts the heating power of the chiller (100) according to the rate of change of the battery core temperature.

6. The energy storage cabinet thermal management control method according to claim 2, characterized in that: Dynamically adjusting the cooling or heating power of the chiller (100) according to the rate of change of the battery core temperature specifically comprises the following steps: When the chiller (100) is in a heating mode, comparing the rate of change of the battery core temperature with a preset first temperature change rate threshold; When the rate of change of the battery core temperature is greater than a preset first temperature change rate threshold, increasing the heating power of the chiller (100); When the rate of change of the battery core temperature is less than a preset first temperature change rate threshold, reducing the heating power of the chiller (100); When the chiller (100) is in a cooling mode, comparing the rate of change of the battery core temperature with a preset second temperature change rate threshold; When the rate of change of the battery core temperature is greater than a preset second temperature change rate threshold, increasing the cooling power of the chiller (100); When the rate of change of the battery core temperature is less than a preset second temperature change rate threshold, the cooling power of the chiller (100) is reduced.

7. The energy storage cabinet thermal management control method according to claim 1, characterized in that: The following steps are also included: A water quality monitoring sensor (109) is also provided in the water circulation flow path of the water chiller (100). The water quality monitoring sensor (109) is used to monitor the water quality of the circulating water in real time. When the water quality does not meet the preset standard, the energy storage cabinet upper BMS control system (300) controls the purification device to purify the circulating water.

8. The energy storage cabinet thermal management control method according to claim 1, characterized in that: The following steps are also included: The energy storage cabinet upper BMS control system (300) is also used to monitor the operating parameters of the system in real time, and when abnormal parameters are monitored, it is determined that a fault has occurred and an alarm signal is issued.

9. The energy storage cabinet thermal management control method according to claim 8, characterized in that: The energy storage cabinet upper BMS control system (300) is also used to monitor the operating parameters of the system in real time. When abnormal parameters are monitored, it is determined that a fault has occurred and an alarm signal is issued, which specifically includes the following steps: Whether the refrigeration compressor (101) is faulty is determined based on the abnormal current of the refrigeration compressor (101), whether the water pump (106) is faulty is determined based on the pressure change of the water circulation flow path of the water pump (106), and whether the pipeline electric heater (105) is faulty is determined based on the power consumption of the pipeline electric heater (105).

10. A method for thermal management control of an energy storage cabinet according to claim 9, characterized in that: Judging whether the refrigeration compressor (101) is faulty according to the abnormal current of the refrigeration compressor (101), judging whether the water pump (106) is faulty according to the pressure change of the water circulation flow path of the water pump (106), and judging whether the pipeline electric heater (105) is faulty according to the power consumption of the pipeline electric heater (105), specifically comprises the following steps: Comparing the current of the refrigeration compressor (101) with a standard current, and if the current of the refrigeration compressor (101) does not correspond to the standard current, determining that the refrigeration compressor (101) is faulty; Comparing the pressure of the water circulation flow path of the water pump (106) with the standard pressure, if the pressure of the water circulation flow path of the water pump (106) does not correspond to the standard pressure, then the water pump (106) is faulty; The power consumption of the pipeline electric heating (105) is compared with the standard power. If the power consumption of the pipeline electric heating (105) does not belong to the standard power, the pipeline electric heating (105) has a fault.

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