Natural cooling control method and system of energy storage battery liquid cooling unit

Abstract

The invention provides a natural cooling control method and system for an energy storage battery liquid cooling unit, and the method comprises the steps: 1, controlling the energy storage battery liquid cooling unit to start a gravity natural cooling mode, and cooling an energy storage battery in the gravity natural cooling mode; 2, the target state of the energy storage battery liquid cooling unit is collected in real time; 3, when the target state reaches a first preset condition, the energy storage battery liquid cooling unit is controlled to be switched to a liquid pump natural cooling mode, and cooling control is conducted on the energy storage battery according to the liquid pump natural cooling mode; 4, updating the target state in real time based on the cooling result, and when the target state reaches a second preset condition, controlling the energy storage battery liquid cooling unit to be switched to a gravity natural cooling mode; through a double-coupling mode of gravity natural cooling and liquid pump natural cooling, an outdoor natural cold source is fully utilized, the operation energy efficiency of the unit is greatly improved, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and in particular to a natural cooling control method and system for an energy storage battery liquid cooling unit. Background Art

[0002] At present, with the gradual deterioration of the global environment and the rapid changes in the energy structure, energy storage batteries, as a form of new energy, are currently in a period of rapid development in applications, such as household storage, industrial and commercial storage, energy storage power stations, etc. Liquid cooling units, as a common equipment for thermal management of energy storage batteries, are also in a period of rapid development;

[0003] Due to the heat dissipation requirements of energy storage batteries, liquid cooling units generally operate for cooling throughout the year. However, in the prior art, cooling is performed by using a compressor, which works on the refrigerant gas and has low efficiency. In addition, the compressor has a minimum operating pressure ratio limit, that is, the exhaust pressure is always greater than the return air pressure during operation. In low temperature seasons, the fan speed will be reduced to raise the exhaust pressure, resulting in the inability to fully utilize the outdoor natural cooling source, resulting in energy waste.

[0004] Therefore, in order to overcome the above technical problems, the present invention provides a natural cooling control method and system for an energy storage battery liquid cooling unit. Summary of the invention

[0005] The present invention provides a natural cooling control method and system for a liquid cooling unit of an energy storage battery, which is used to start a gravity natural cooling mode, and when a target state reaches a first preset condition, switch to a liquid pump natural cooling mode, and when the updated target state reaches a second preset condition, control the liquid cooling unit of the energy storage battery to switch to the gravity natural cooling mode. Through the dual coupling of gravity natural cooling and liquid pump natural cooling, the outdoor natural cold source is fully utilized, the unit operation energy efficiency is greatly improved, and energy conservation and emission reduction are achieved.

[0006] A natural cooling control method for an energy storage battery liquid cooling unit, comprising:

[0007] Step 1: Control the energy storage battery liquid cooling unit to start the gravity natural cooling mode, and cool the energy storage battery in the gravity natural cooling mode;

[0008] Step 2: Collect the target status of the energy storage battery liquid cooling unit in real time;

[0009] Step 3: When the target state reaches the first preset condition, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode, and the energy storage battery is cooled according to the liquid pump natural cooling mode;

[0010] Step 4: Update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

[0011] Preferably, a natural cooling control method for a liquid cooling unit of an energy storage battery, in step 1, controlling the liquid cooling unit of the energy storage battery to start a gravity natural cooling mode, comprises:

[0012] Real-time monitoring of whether the energy storage battery is in working condition. If the energy storage battery is in working condition and reaches the set temperature, a gravity natural cooling mode trigger instruction is generated;

[0013] At the same time, the position information of each one-way valve under the gravity natural cooling mode is obtained, and a serial number label is added to each one-way valve according to the position information;

[0014] Generate valve control instructions according to the serial number information of each one-way valve;

[0015] According to the gravity natural cooling mode triggering instruction and the valve control instruction, the energy storage battery liquid cooling unit is controlled to start the gravity natural cooling mode and work.

[0016] Preferably, a natural cooling control method for a liquid cooling unit of an energy storage battery, in step 3, when the target state reaches a first preset condition, the liquid cooling unit of the energy storage battery is controlled to switch to a liquid pump natural cooling mode, comprising:

[0017] The target state is read to determine the current ambient temperature of the energy storage battery liquid cooling unit in the target state, and at the same time, the current pipeline resistance of the energy storage battery liquid cooling unit is obtained;

[0018] Obtain a preset ambient temperature threshold and obtain a maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit;

[0019] Compare the current ambient temperature of the energy storage battery liquid cooling unit in the target state with the preset ambient temperature threshold, and at the same time, compare the current pipeline resistance of the energy storage battery liquid cooling unit with the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit to determine whether the first preset condition is met;

[0020] When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is lower than the preset ambient temperature threshold, and the current pipeline resistance of the energy storage battery liquid cooling unit is lower than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is not met;

[0021] When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is equal to or greater than the preset ambient temperature threshold, or the current pipeline resistance of the energy storage battery liquid cooling unit is equal to or greater than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is met;

[0022] When the first preset condition is reached, a liquid pump natural cooling mode trigger instruction is generated;

[0023] According to the liquid pump natural cooling mode trigger instruction, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode.

[0024] Preferably, a natural cooling control method for a liquid cooling unit of an energy storage battery, in step 3, cooling control of the energy storage battery is performed according to the natural cooling mode of the liquid pump, including:

[0025] The first control of the liquid pump and the electronic expansion valve is performed, and the specific process is as follows:

[0026] Collecting the ambient temperature and determining a first temperature threshold;

[0027] When the ambient temperature is lower than the first temperature threshold, the minimum frequency of the liquid pump operation is obtained, and the liquid pump is controlled to start operation according to the minimum frequency, and at the same time, the electronic expansion valve is controlled to maintain operation at the initial opening;

[0028] Real-time detection of the running time of the liquid pump, and when the running time of the liquid pump reaches the preset time threshold,

[0029] Read the return air superheat ΔT and obtain the preset return air superheat parameter range [ΔT S +a, ΔT S +a], where ΔT S is set in advance, and the value range is (2, 4) °C; a is set in advance, and the value range is (1, 3) °C;

[0030] When ΔT>ΔT S -a, the electronic expansion valve opening is controlled to be gradually opened according to the target action step in each adjustment cycle, and when the electronic expansion valve opening exceeds 80% of the maximum opening, the control liquid pump is controlled to gradually increase the frequency according to the target adjustment amplitude in each adjustment cycle;

[0031] When ΔT S +a≥ΔT≥ΔT S -a, the electronic expansion valve and the liquid pump are controlled to maintain the current state;

[0032] When ΔT<ΔT S-a, the control liquid pump gradually reduces the frequency according to the target condition amplitude in each adjustment cycle, and when the frequency of the liquid pump is reduced to the lowest frequency, the control electronic expansion valve opening is gradually closed according to the target action step in each adjustment cycle;

[0033] The fan speed is controlled in the second step. The specific process is as follows:

[0034] According to the liquid supply temperature sensor, the liquid supply temperature T o At the same time, obtain the preset liquid supply temperature threshold T os , and determine the preset liquid supply temperature threshold T os The permissible fluctuation range of

[0035] According to the preset liquid supply temperature threshold T os And the preset liquid supply temperature threshold T os The allowable fluctuation range of the fan speed adjustment judgment interval [T os -b,T os +b], where the value range of b is (1, 3)℃;

[0036] When T o >T os +b, the fan speed is controlled to increase gradually according to the preset adjustment range in each adjustment cycle;

[0037] When T os +b≥T o ≥T os -b, the fan speed is controlled to remain unchanged;

[0038] When T o <T os -b, the fan speed is controlled to decrease gradually in each cycle according to the preset adjustment range.

[0039] Preferably, a natural cooling control method for a liquid cooling unit of an energy storage battery, in step 4, the target state is updated in real time based on the cooling result, and when the target state reaches a second preset condition, the liquid cooling unit of the energy storage battery is controlled to switch to a gravity natural cooling mode, including:

[0040] Read the updated target state to determine the current operating frequency of the liquid pump, the operating duration of the liquid pump, and the liquid supply temperature T o ;

[0041] Reading the ambient temperature and obtaining a second temperature threshold;

[0042] When the ambient temperature is less than the second temperature threshold, determining whether the current operating frequency of the liquid pump is the lowest operating frequency;

[0043] If the current operating frequency of the liquid pump is the lowest operating frequency, determining whether the operating duration of the liquid pump reaches a first preset time threshold;

[0044] When the running duration of the liquid pump is equal to or greater than the first preset time threshold, the preset liquid supply temperature threshold T is obtained. os The maximum allowable value T os +b;

[0045] Set the supply temperature T o With the maximum allowable value T os +b for comparison, when T o ≤T os +b, determining whether the switching from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds a second preset time threshold;

[0046] If the time from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds the second preset time threshold, it is determined that the second preset condition is met;

[0047] When the second preset condition is reached, the energy storage battery liquid cooling unit is controlled to switch to the gravity natural cooling mode.

[0048] Preferably, a natural cooling control method for an energy storage battery liquid cooling unit, in step 2, real-time acquisition of the target state of the energy storage battery liquid cooling unit includes:

[0049] Read the structural composition of the energy storage battery liquid cooling unit, and build a status monitoring window for each structure according to the structural composition of the energy storage battery liquid cooling unit;

[0050] Obtain the monitoring dimensions for dynamic monitoring of each structure in the energy storage battery liquid cooling unit;

[0051] Create a sub-status monitoring window in the status monitoring window of each structure according to the monitoring dimension of dynamic monitoring of each structure in the energy storage battery liquid cooling unit;

[0052] According to the state monitoring window and the sub-state monitoring window, the collected working operation data of the energy storage battery liquid cooling unit is stored and analyzed to obtain the target state of the energy storage battery liquid cooling unit.

[0053] Preferably, a natural cooling control method for an energy storage battery liquid cooling unit stores and analyzes the collected working operation data of the energy storage battery liquid cooling unit according to a state monitoring window and a sub-state monitoring window, including:

[0054] Obtain the dimension identifier of the monitoring dimension, and encapsulate the dimension identifier in the sub-status monitoring window;

[0055] Construct a data receiving end, and connect the data receiving end with each state monitoring window, and each state monitoring window is connected with the corresponding sub-state monitoring window;

[0056] Based on the data receiving end, the working operation data of the energy storage battery liquid cooling unit is collected in real time, and the working operation data is read according to the data receiving end, the structural keywords in the working operation data are determined, and the working operation data is divided according to the structural keywords to obtain multiple sub-working operation data;

[0057] Transmit sub-task operation data to the corresponding status monitoring window;

[0058] Read the sub-work operation data according to the status monitoring window to determine the data identifier of the sub-work operation data;

[0059] Match the data identifier of the sub-work running data with the dimension identifier, and transmit the sub-work running data to the corresponding sub-status monitoring window according to the matching result;

[0060] Read the sub-work operation data according to the sub-state monitoring window, and determine the sub-target state of the sub-work operation data corresponding to each sub-state monitoring window;

[0061] The sub-target states corresponding to each sub-state monitoring window are integrated to obtain the target state of each structure in the energy storage battery liquid cooling unit.

[0062] Preferably, a natural cooling control method for an energy storage battery liquid cooling unit, after obtaining the target state of each structure in the energy storage battery liquid cooling unit, further comprises:

[0063] The target status of each structure is synthesized to generate a status report of the energy storage battery liquid cooling unit;

[0064] Obtain the time information when the target state is determined, and add a time tag to the state report according to the time information to obtain the target state report;

[0065] At the same time, the target status report is transmitted to the monitoring terminal.

[0066] A natural cooling control system for an energy storage battery liquid cooling unit, comprising:

[0067] The first control start module is used to control the energy storage battery liquid cooling unit to start the gravity natural cooling mode and cool the energy storage battery in the gravity natural cooling mode;

[0068] The state acquisition module is used to collect the target state of the energy storage battery liquid cooling unit in real time;

[0069] The second control start module controls the energy storage battery liquid cooling unit to switch to a liquid pump natural cooling mode when the target state reaches a first preset condition, and performs cooling control on the energy storage battery according to the liquid pump natural cooling mode;

[0070] The mode switching module is used to update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

[0071] Preferably, in a natural cooling control system of an energy storage battery liquid cooling unit, in a first control starting module, the components of the energy storage battery liquid cooling unit include: a compressor, a return air temperature sensor, a return liquid temperature sensor, a liquid supply temperature sensor, a medium heat exchanger, an electronic expansion valve, a one-way valve 1, a liquid pump, an ambient temperature sensor, a fan, an outer heat exchanger, a return air pressure sensor, a one-way valve 2, a one-way valve 3, an exhaust pressure sensor, and an exhaust temperature sensor.

[0072] Compared with the prior art, the beneficial effects of the present invention are as follows: by starting the gravity natural cooling mode, and when the target state reaches the first preset condition, switching to the liquid pump natural cooling mode, and when the updated target state reaches the second preset condition, controlling the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode, through the dual coupling of gravity natural cooling and liquid pump natural cooling, full use is made of the outdoor natural cold source, greatly improving the unit's operating energy efficiency, and saving energy and reducing emissions.

[0073] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in this application document.

[0074] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0076] Figure 1 This is a flow chart of a natural cooling control method for a liquid cooling unit of an energy storage battery in an embodiment of the present invention;

[0077] Figure 2 This is a structural diagram of a natural cooling control system of an energy storage battery liquid cooling unit in an embodiment of the present invention;

[0078] Figure 3 This is a structural diagram of the energy storage battery liquid cooling unit system in an embodiment of the present invention. DETAILED DESCRIPTION

[0079] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0080] Embodiment 1:

[0081] This embodiment provides a natural cooling control method for a liquid cooling unit of an energy storage battery. Figure 1 As shown, including:

[0082] Step 1: Control the energy storage battery liquid cooling unit to start the gravity natural cooling mode, and cool the energy storage battery in the gravity natural cooling mode;

[0083] Step 2: Collect the target status of the energy storage battery liquid cooling unit in real time;

[0084] Step 3: When the target state reaches the first preset condition, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode, and the energy storage battery is cooled according to the liquid pump natural cooling mode;

[0085] Step 4: Update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

[0086] In this embodiment, the target state can be a state that characterizes each structure corresponding to the energy storage battery cold liquid unit, such as: ambient temperature, pipeline resistance, liquid pump operating frequency, etc. The target state can be updated in real time with the cooling process and the operation change of the energy storage battery cold liquid unit.

[0087] In this embodiment, the first preset condition can be that when the current ambient temperature of the energy storage battery liquid cooling unit in the target state is equal to or greater than the preset ambient temperature threshold, or the current pipeline resistance of the energy storage battery liquid cooling unit is equal to or greater than the maximum gravity of the liquid refrigerant in the energy storage battery liquid cooling unit, it is used as a standard for determining whether to start the liquid pump natural cooling mode.

[0088] In this embodiment, the second preset condition may be used as a standard for determining whether to switch to the gravity natural cooling mode.

[0089] In this embodiment, under low temperature environment, a dual coupling method of gravity natural cooling and liquid pump natural cooling is adopted to make full use of outdoor natural cold source to achieve efficient and energy-saving operation. According to the detailed design of pipeline pressure loss and static pressure difference to be overcome, the height difference between the outer heat exchanger and the medium heat exchanger is used to realize gravity liquid supply, and efficient refrigeration can be achieved without turning on the compressor and the main consumable parts of the liquid pump. When the gravity liquid supply is insufficient, the auxiliary liquid supply is turned on by controlling the liquid pump to ensure sufficient refrigeration capacity. The liquid pump drives the liquid and the compressor drives the gas. Since the density of the liquid is much greater than that of the gas, the operating efficiency of the liquid pump is much higher than that of the compressor. Only turning on the liquid pump can still ensure the efficient operation of the system.

[0090] The working principle and beneficial effects of the above technical solution are: by starting the gravity natural cooling mode, and when the target state reaches the first preset condition, switching to the liquid pump natural cooling mode, and when the updated target state reaches the second preset condition, controlling the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode, through the dual coupling of gravity natural cooling and liquid pump natural cooling, full use is made of the outdoor natural cold source, greatly improving the unit's operating energy efficiency, saving energy and reducing emissions.

[0091] Embodiment 2:

[0092] Based on Example 1, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit. In step 1, the energy storage battery liquid cooling unit is controlled to start a gravity natural cooling mode, including:

[0093] Real-time monitoring of whether the energy storage battery is in working condition. If the energy storage battery is in working condition and reaches the set temperature, a gravity natural cooling mode trigger instruction is generated;

[0094] At the same time, the position information of each one-way valve under the gravity natural cooling mode is obtained, and a serial number label is added to each one-way valve according to the position information;

[0095] Generate valve control instructions according to the serial number information of each one-way valve;

[0096] According to the gravity natural cooling mode triggering instruction and the valve control instruction, the energy storage battery liquid cooling unit is controlled to start the gravity natural cooling mode and work.

[0097] In this embodiment, the gravity natural cooling mode trigger instruction can be automatically generated after the energy storage battery reaches a set temperature, and is used to control the energy storage battery liquid cooling unit to enter the gravity natural cooling mode.

[0098] In this embodiment, the serial number label is generated according to the position information of the one-way valve and is used to distinguish different one-way valves.

[0099] The working principle and beneficial effects of the above technical solution are: by monitoring whether the energy storage battery is in a working state, and when the energy storage battery is in a working state and the energy storage battery reaches a set temperature, a gravity natural cooling mode trigger instruction is effectively generated, and by determining the position information of each one-way valve under the gravity natural cooling mode, a serial number label is effectively added to each one-way valve, thereby generating a valve control instruction, and then the energy storage battery liquid cooling unit is controlled to start the gravity natural cooling mode and work through the gravity natural cooling mode trigger instruction and the valve control instruction, which effectively improves the effectiveness and orderliness of the control, thereby ensuring the intelligence of the gravity natural cooling mode.

[0100] Embodiment 3:

[0101] Based on Example 1, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit. In step 3, when the target state reaches a first preset condition, the energy storage battery liquid cooling unit is controlled to switch to a liquid pump natural cooling mode, including:

[0102] The target state is read to determine the current ambient temperature of the energy storage battery liquid cooling unit in the target state, and at the same time, the current pipeline resistance of the energy storage battery liquid cooling unit is obtained;

[0103] Obtain a preset ambient temperature threshold and obtain a maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit;

[0104] Compare the current ambient temperature of the energy storage battery liquid cooling unit in the target state with the preset ambient temperature threshold, and at the same time, compare the current pipeline resistance of the energy storage battery liquid cooling unit with the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit to determine whether the first preset condition is met;

[0105] When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is lower than the preset ambient temperature threshold, and the current pipeline resistance of the energy storage battery liquid cooling unit is lower than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is not met;

[0106] When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is equal to or greater than the preset ambient temperature threshold, or the current pipeline resistance of the energy storage battery liquid cooling unit is equal to or greater than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is met;

[0107] When the first preset condition is reached, a liquid pump natural cooling mode trigger instruction is generated;

[0108] According to the liquid pump natural cooling mode trigger instruction, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode.

[0109] In this embodiment, the current pipeline resistance can be used to characterize the state of each pipeline in the energy storage battery liquid cooling unit, thereby providing a parameter basis for determining whether the first preset condition is met.

[0110] In this embodiment, the maximum gravity value may be the gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, which is determined based on the weight of the liquid refrigerant in the energy storage battery liquid cooling unit and the gravitational acceleration.

[0111] The working principle and beneficial effect of the above technical solution are: by determining the current ambient temperature and current pipeline resistance of the energy storage battery liquid cooling unit, and at the same time, determining the ambient temperature threshold and the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, the current ambient temperature of the energy storage battery liquid cooling unit in the target state is effectively compared with the preset ambient temperature threshold, and at the same time, the current pipeline resistance of the energy storage battery liquid cooling unit is compared with the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit to determine whether the first preset condition is met; when the current ambient temperature of the energy storage battery liquid cooling unit in the target state is equal to or greater than the preset ambient temperature threshold, or the current pipeline resistance of the energy storage battery liquid cooling unit is equal to or greater than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is met, and when the first preset condition is met, a liquid pump natural cooling mode trigger instruction is generated and the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode, effectively realizing the switching of the liquid pump natural cooling mode, thereby ensuring efficient cooling of the energy storage battery.

[0112] Embodiment 4:

[0113] Based on Example 1, this embodiment provides a natural cooling control method for a liquid cooling unit of an energy storage battery. In step 3, cooling control is performed on the energy storage battery according to the natural cooling mode of the liquid pump, including:

[0114] The first control of the liquid pump and the electronic expansion valve is performed, and the specific process is as follows:

[0115] Collecting the ambient temperature and determining a first temperature threshold (wherein the first temperature threshold may be obtained according to the design working conditions of a specific product, and at least ensures that the natural cooling mode of the liquid pump operating at the ambient temperature Tb can provide more than 80% to 90% of the rated cooling capacity);

[0116] When the ambient temperature is lower than the first temperature threshold, the minimum frequency of the liquid pump operation is obtained (generally the minimum frequency specified in the liquid pump technical specification), and the liquid pump is controlled to start running according to the minimum frequency, and at the same time, the electronic expansion valve is controlled to maintain operation at the initial opening;

[0117] Real-time detection of the running time of the liquid pump, and when the running time of the liquid pump reaches the preset time threshold (one minute),

[0118] Read the return air superheat ΔT and obtain the preset return air superheat parameter range [ΔT S +a, ΔT S +a], where ΔT S is set in advance, and the value range is (2, 4) °C; a is set in advance, and the value range is (1, 3) °C;

[0119] When ΔT>ΔT S -a, the electronic expansion valve opening is controlled to be gradually opened according to the target action step according to each adjustment cycle (each action step generally does not exceed 2% of its maximum opening), and when the electronic expansion valve opening exceeds 80% of the maximum opening, the liquid pump is controlled to gradually increase the frequency according to the target adjustment amplitude according to each adjustment cycle (the frequency adjustment amplitude generally does not exceed 8Hz each time, and the electronic expansion valve is adjusted first to prevent the liquid pump from generating additional power consumption in order to overcome the throttling resistance of the electronic expansion valve);

[0120] When ΔT S +a≥ΔT≥ΔT S -a, the electronic expansion valve and the liquid pump are controlled to maintain the current state;

[0121] When ΔT<ΔT S -a, the control liquid pump gradually reduces the frequency according to the target condition amplitude in each adjustment cycle (the frequency adjustment amplitude is generally not more than 8Hz each time), and when the frequency of the liquid pump is reduced to the minimum frequency (generally the minimum frequency specified in the technical specification of the liquid pump), the electronic expansion valve opening is controlled to be gradually closed according to the target action step in each adjustment cycle (each action step is generally not more than 2% of its maximum opening);

[0122] The fan speed is controlled in the second step. The specific process is as follows:

[0123] According to the liquid supply temperature sensor, the liquid supply temperature T o At the same time, obtain the preset liquid supply temperature threshold T os , and determine the preset liquid supply temperature threshold T os The permissible fluctuation range of

[0124] According to the preset liquid supply temperature threshold T os And the preset liquid supply temperature threshold T os The allowable fluctuation range of the fan speed adjustment judgment interval [T os -b,T os +b], where the value range of b is (1, 3)℃;

[0125] When T o >T os+b, the fan speed is controlled to increase gradually according to the preset adjustment range in each adjustment cycle (the speed adjustment range each time generally does not exceed 5% of its maximum speed);

[0126] When T os +b≥T o ≥T os -b, the fan speed is controlled to remain unchanged;

[0127] When T o <T os -b, the fan speed is controlled to be gradually reduced according to the preset adjustment range in each cycle (the speed adjustment range each time generally does not exceed 5% of its maximum speed).

[0128] In this embodiment, the return air superheat ΔT=Th-Te, wherein Th represents the return air temperature, which is detected by the return air temperature sensor; Te represents the return air pressure saturation temperature, which is obtained by the return air pressure sensor and converted by the program.

[0129] In this embodiment, the initial opening degree may be the opening amplitude of the electronic expansion valve when it starts to work.

[0130] In this embodiment, the target action step is set in advance and is used to represent a specific value for adjusting the opening of the electronic expansion valve each time.

[0131] In this embodiment, the target condition magnitude is known in advance.

[0132] In this embodiment, the allowable fluctuation range may be a preset liquid supply temperature threshold T os The up and down fluctuation amplitude.

[0133] The working principle and beneficial effect of the above technical solution are: different situations are limited by the control steps and control conditions of the liquid pump, electronic expansion valve and fan speed, so that it is convenient to adopt the corresponding control scheme at the corresponding time according to the control requirements to effectively control the energy storage battery liquid cooling unit, thereby ensuring the natural cooling effect of the energy storage battery liquid cooling unit and saving energy at the same time.

[0134] Embodiment 5:

[0135] Based on Example 1, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit. In step 4, the target state is updated in real time based on the cooling result, and when the target state reaches a second preset condition, the energy storage battery liquid cooling unit is controlled to switch to a gravity natural cooling mode, including:

[0136] Read the updated target state to determine the current operating frequency of the liquid pump, the operating duration of the liquid pump, and the liquid supply temperature T o ;

[0137] Read the ambient temperature and obtain a second temperature threshold (the second temperature threshold may be obtained according to the design conditions of the specific product, and at least ensure that the gravity natural cooling mode can provide 80% to 90% of the rated cooling capacity at the ambient temperature Tz);

[0138] When the ambient temperature is less than the second temperature threshold, determining whether the current operating frequency of the liquid pump is the lowest operating frequency;

[0139] If the current operating frequency of the liquid pump is the lowest operating frequency, determine whether the operating duration of the liquid pump reaches a first preset time threshold (the first preset time threshold is 30 minutes);

[0140] When the running duration of the liquid pump is equal to or greater than the first preset time threshold, the preset liquid supply temperature threshold T is obtained. os The maximum allowable value T os +b;

[0141] Set the supply temperature T o With the maximum allowable value T os +b for comparison, when T o ≤T os +b, determine whether the switching from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds the second preset time threshold (the second preset time threshold is 2 hours);

[0142] If the time from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds the second preset time threshold, it is determined that the second preset condition is met;

[0143] When the second preset condition is reached, the energy storage battery liquid cooling unit is controlled to switch to the gravity natural cooling mode.

[0144] In this embodiment, the energy storage battery liquid cooling unit is switched to the gravity natural cooling mode by shutting down the liquid pump, controlling the electronic expansion valve according to the target return air superheat △Ts, and controlling the fan according to the target liquid supply temperature T os Control, where the fan speed runs at the maximum speed for more than 15 minutes and T o >T os +b If there is no downward trend for 3 consecutive minutes, the liquid pump will run in natural cooling mode.

[0145] The working principle and beneficial effect of the above technical solution are: by reading the updated target state and parsing the real-time target state after reading, the switching timing of the cooling mode of the energy storage battery liquid cooling unit can be accurately and effectively determined, so as to facilitate timely switching of the cooling mode of the energy storage battery liquid cooling unit to the gravity natural cooling mode, thereby ensuring the cooling effect of the energy storage battery liquid cooling unit.

[0146] Embodiment 6:

[0147] Based on Example 1, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit. In step 2, real-time acquisition of the target state of the energy storage battery liquid cooling unit includes:

[0148] Read the structural composition of the energy storage battery liquid cooling unit, and build a status monitoring window for each structure according to the structural composition of the energy storage battery liquid cooling unit;

[0149] Obtain the monitoring dimensions for dynamic monitoring of each structure in the energy storage battery liquid cooling unit;

[0150] Create a sub-status monitoring window in the status monitoring window of each structure according to the monitoring dimension of dynamic monitoring of each structure in the energy storage battery liquid cooling unit;

[0151] According to the state monitoring window and the sub-state monitoring window, the collected working operation data of the energy storage battery liquid cooling unit is stored and analyzed to obtain the target state of the energy storage battery liquid cooling unit.

[0152] In this embodiment, the monitoring dimensions may include: the temperature of each structure, the operating time, etc.

[0153] In this embodiment, the status monitoring window may represent a mechanism for monitoring and collecting operating data of various structures in the energy storage battery liquid cooling unit.

[0154] In this embodiment, the monitoring dimension may be the type of monitoring of each structure in the energy storage battery liquid cooling unit.

[0155] In this embodiment, the sub-state monitoring windows correspond to the monitoring dimensions one by one, and each sub-state monitoring window is used to monitor a type of data of a structure.

[0156] The working principle and beneficial effects of the above technical solution are: by determining the structural composition of the energy storage battery liquid cooling unit, the construction of the status monitoring window is effectively realized; by determining the monitoring dimension for dynamic monitoring of each structure in the energy storage battery liquid cooling unit, the creation of a sub-status monitoring window in the status monitoring window of each structure is effectively realized, so that the collected working operation data of the energy storage battery liquid cooling unit is stored and analyzed according to the status monitoring window and the sub-status monitoring window, the target state of the energy storage battery liquid cooling unit is obtained, and the comprehensiveness and effectiveness of the status detection of the energy storage battery liquid cooling unit are effectively improved.

[0157] Embodiment 7:

[0158] Based on Example 6, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit, which stores and analyzes the collected working operation data of the energy storage battery liquid cooling unit according to the status monitoring window and the sub-status monitoring window, including:

[0159] Obtain the dimension identifier of the monitoring dimension, and encapsulate the dimension identifier in the sub-status monitoring window;

[0160] Construct a data receiving end, and connect the data receiving end with each state monitoring window, and each state monitoring window is connected with the corresponding sub-state monitoring window;

[0161] Based on the data receiving end, the working operation data of the energy storage battery liquid cooling unit is collected in real time, and the working operation data is read according to the data receiving end, the structural keywords in the working operation data are determined, and the working operation data is divided according to the structural keywords to obtain multiple sub-working operation data;

[0162] Transmit sub-task operation data to the corresponding status monitoring window;

[0163] Read the sub-work operation data according to the status monitoring window to determine the data identifier of the sub-work operation data;

[0164] Match the data identifier of the sub-work running data with the dimension identifier, and transmit the sub-work running data to the corresponding sub-status monitoring window according to the matching result;

[0165] Read the sub-work operation data according to the sub-state monitoring window, and determine the sub-target state of the sub-work operation data corresponding to each sub-state monitoring window;

[0166] The sub-target states corresponding to each sub-state monitoring window are integrated to obtain the target state of each structure in the energy storage battery liquid cooling unit.

[0167] In this embodiment, the dimension identifier is a marking symbol used to mark different monitoring dimensions.

[0168] In this embodiment, the operating data may be the operating data corresponding to the energy storage battery liquid cooling unit during normal operation.

[0169] In this embodiment, the structural keyword may be a data segment in the work operation data that can represent the data core or main content.

[0170] In this embodiment, the sub-task running data may be different data segments obtained by dividing the task running data according to the structural keywords.

[0171] In this embodiment, the data identifier is symbol information used to distinguish sub-task running data.

[0172] In this embodiment, the sub-target state may be a result obtained after the sub-state monitoring window analyzes the corresponding sub-task operation data.

[0173] The working principle and beneficial effects of the above technical solution are: by determining the monitoring dimension and encapsulating the monitoring dimension and the sub-state monitoring window, at the same time, the structural keywords of the working operation data of the energy storage battery liquid cooling unit are determined, and the working operation data are divided according to the structural keywords, so as to facilitate the input of working operation data of different dimensions into the corresponding sub-state monitoring window for analysis; secondly, the sub-working operation data is read and analyzed through the sub-state monitoring window, and the analysis results are summarized, so as to realize the accurate and effective determination of the target state of each structure in the energy storage battery liquid cooling unit, thereby providing convenience and guarantee for the cooling of the energy storage battery liquid cooling unit.

[0174] Embodiment 8:

[0175] Based on Example 7, this embodiment provides a natural cooling control method for an energy storage battery liquid cooling unit. After obtaining the target state of each structure in the energy storage battery liquid cooling unit, the method further includes:

[0176] The target status of each structure is synthesized to generate a status report of the energy storage battery liquid cooling unit;

[0177] Obtain the time information when the target state is determined, and add a time tag to the state report according to the time information to obtain the target state report;

[0178] At the same time, the target status report is transmitted to the monitoring terminal.

[0179] In this embodiment, the status report may be a data report obtained by summarizing the target status of each structure and capable of characterizing the overall operating status of the energy storage battery liquid cooling unit.

[0180] In this embodiment, the time tag is generated according to the time information of the target state, and is used to characterize the specific time attribute in the state report, so as to facilitate effective understanding of the operation status of the energy storage battery liquid cooling unit at different times.

[0181] In this embodiment, the target status report may be a result obtained by adding a time tag to the status report.

[0182] The working principle and beneficial effects of the above technical solution are: by generating a status report and adding a time tag, the timeliness of obtaining the target status report is guaranteed, and by transmitting the target status report to the monitoring terminal, the target status of the energy storage battery liquid cooling unit is effectively read, thereby improving the effectiveness of obtaining the target status of the energy storage battery liquid cooling unit.

[0183] Embodiment 9:

[0184] A natural cooling control system for a liquid cooling unit of an energy storage battery, such as Figure 2 As shown, including:

[0185] The first control start module is used to control the energy storage battery liquid cooling unit to start the gravity natural cooling mode and cool the energy storage battery in the gravity natural cooling mode;

[0186] The state acquisition module is used to collect the target state of the energy storage battery liquid cooling unit in real time;

[0187] The second control start module controls the energy storage battery liquid cooling unit to switch to a liquid pump natural cooling mode when the target state reaches a first preset condition, and performs cooling control on the energy storage battery according to the liquid pump natural cooling mode;

[0188] The mode switching module is used to update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

[0189] In this embodiment, in the first control startup module, Figure 3 As shown, the energy storage battery liquid cooling unit includes: a compressor 1, a return air temperature sensor 2, a return liquid temperature sensor 3, a liquid supply temperature sensor 4, a medium heat exchanger 5, an electronic expansion valve 6, a one-way valve 1 7, a liquid pump 8, an ambient temperature sensor 9, a fan 10, an outer heat exchanger 11, a return air pressure sensor 12, a one-way valve 2 13, a one-way valve 3 14, an exhaust pressure sensor 15, and an exhaust temperature sensor 16.

[0190] In this embodiment, the working principle of the gravity natural cooling mode is as follows: in a limited unit box, the outer heat exchanger 11 is placed at the top and the medium heat exchanger 5 is placed at the bottom, forming a height difference between the outer heat exchanger 11 and the medium heat exchanger 5. The liquid refrigerant condensed in the outer heat exchanger 11 overcomes the pipeline resistance and static pressure difference between the outer heat exchanger 11 and the medium heat exchanger 5 under the action of gravity, and enters the medium heat exchanger 5 through the one-way valve 1 7 to exchange heat with the cooling medium and evaporate to become a gaseous refrigerant. Under the action of the pressure difference between the medium heat exchanger 5 and the outer heat exchanger 11, the gaseous refrigerant overcomes the pipeline resistance, passes through the one-way valve 2 13, returns to the outer heat exchanger 11 to exchange heat with the external low-temperature air and condenses into a liquid refrigerant. This cycle forms a gravity natural cooling operation mode.

[0191] In this embodiment, the working principle of the liquid pump natural cooling mode is: when the outdoor ambient temperature is high or the pipeline resistance is large, and gravity alone is insufficient to form a sufficient refrigerant circulation flow, the liquid pump 8 is turned on, and the liquid pump 8 provides power to transport the liquid refrigerant condensed in the outer heat exchanger 11 to the medium heat exchanger 5. The liquid refrigerant exchanges heat with the cooling medium in the medium heat exchanger 5 and evaporates to become a gaseous refrigerant. Under the action of the pressure difference between the medium heat exchanger 5 and the outer heat exchanger 11, the gaseous refrigerant overcomes the pipeline resistance, passes through the one-way valve 13, returns to the outer heat exchanger 11, exchanges heat with the external low-temperature air, and condenses into a liquid refrigerant. This cycle forms the liquid pump natural cooling operation mode.

[0192] The working principle and beneficial effects of the above technical solution are: by starting the gravity natural cooling mode, and when the target state reaches the first preset condition, switching to the liquid pump natural cooling mode, and when the updated target state reaches the second preset condition, controlling the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode, through the dual coupling of gravity natural cooling and liquid pump natural cooling, full use is made of the outdoor natural cold source, greatly improving the unit's operating energy efficiency, saving energy and reducing emissions.

[0193] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A natural cooling control method for a liquid cooling unit of an energy storage battery, characterized in that: include: Step 1: Control the energy storage battery liquid cooling unit to start the gravity natural cooling mode, and cool the energy storage battery in the gravity natural cooling mode; Step 2: Collect the target status of the energy storage battery liquid cooling unit in real time; Step 3: When the target state reaches the first preset condition, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode, and the energy storage battery is cooled according to the liquid pump natural cooling mode; Step 4: Update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

2. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 1, characterized in that: In step 1, the energy storage battery liquid cooling unit is controlled to start the gravity natural cooling mode, including: Real-time monitoring of whether the energy storage battery is in working condition. If the energy storage battery is in working condition and reaches the set temperature, a gravity natural cooling mode trigger instruction is generated; At the same time, the position information of each one-way valve under the gravity natural cooling mode is obtained, and a serial number label is added to each one-way valve according to the position information; Generate valve control instructions according to the serial number information of each one-way valve; According to the gravity natural cooling mode triggering instruction and the valve control instruction, the energy storage battery liquid cooling unit is controlled to start the gravity natural cooling mode and work.

3. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 1, characterized in that: In step 3, when the target state reaches the first preset condition, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode, including: The target state is read to determine the current ambient temperature of the energy storage battery liquid cooling unit in the target state, and at the same time, the current pipeline resistance of the energy storage battery liquid cooling unit is obtained; Obtain a preset ambient temperature threshold and obtain a maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit; Compare the current ambient temperature of the energy storage battery liquid cooling unit in the target state with the preset ambient temperature threshold, and at the same time, compare the current pipeline resistance of the energy storage battery liquid cooling unit with the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit to determine whether the first preset condition is met; When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is lower than the preset ambient temperature threshold, and the current pipeline resistance of the energy storage battery liquid cooling unit is lower than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is not met; When the current ambient temperature of the energy storage battery liquid cooling unit in the target state is equal to or greater than the preset ambient temperature threshold, or the current pipeline resistance of the energy storage battery liquid cooling unit is equal to or greater than the maximum gravity value of the liquid refrigerant in the energy storage battery liquid cooling unit, it is determined that the first preset condition is met; When the first preset condition is reached, a liquid pump natural cooling mode trigger instruction is generated; According to the liquid pump natural cooling mode trigger instruction, the energy storage battery liquid cooling unit is controlled to switch to the liquid pump natural cooling mode.

4. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 1, characterized in that: In step 3, the energy storage battery is cooled and controlled according to the natural cooling mode of the liquid pump, including: The first control of the liquid pump and the electronic expansion valve is performed, and the specific process is as follows: Collecting the ambient temperature and determining a first temperature threshold; When the ambient temperature is lower than the first temperature threshold, the minimum frequency of the liquid pump operation is obtained, and the liquid pump is controlled to start operation according to the minimum frequency, and at the same time, the electronic expansion valve is controlled to maintain operation at the initial opening; Real-time detection of the running time of the liquid pump, and when the running time of the liquid pump reaches the preset time threshold, Read the return air superheat ΔT and obtain the preset return air superheat parameter range [ΔT S +a, ΔT S +a], where ΔT S is set in advance, and the value range is (2, 4) °C; a is set in advance, and the value range is (1, 3) °C; When ΔT>ΔT S -a, the electronic expansion valve opening is controlled to be gradually opened according to the target action step in each adjustment cycle, and when the electronic expansion valve opening exceeds 80% of the maximum opening, the control liquid pump is controlled to gradually increase the frequency according to the target adjustment amplitude in each adjustment cycle; When ΔT S +a≥ΔT≥ΔT S -a, the electronic expansion valve and the liquid pump are controlled to maintain the current state; When ΔT<ΔT S -a, the control liquid pump gradually reduces the frequency according to the target condition amplitude in each adjustment cycle, and when the frequency of the liquid pump is reduced to the lowest frequency, the control electronic expansion valve opening is gradually closed according to the target action step in each adjustment cycle; The fan speed is controlled in the second step. The specific process is as follows: According to the liquid supply temperature sensor, the liquid supply temperature T o At the same time, obtain the preset liquid supply temperature threshold T os , and determine the preset liquid supply temperature threshold T os The permissible fluctuation range of According to the preset liquid supply temperature threshold T os And the preset liquid supply temperature threshold T os The allowable fluctuation range of the fan speed adjustment judgment interval [T os -b,T os +b], where the value range of b is (1, 3)℃; When T o >T os +b, the fan speed is controlled to increase gradually according to the preset adjustment range in each adjustment cycle; When T os +b≥T o ≥T os -b, the fan speed is controlled to remain unchanged; When T o <T os -b, the fan speed is controlled to decrease gradually in each cycle according to the preset adjustment range.

5. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 1, characterized in that: In step 4, the target state is updated in real time based on the cooling result, and when the target state reaches the second preset condition, the energy storage battery liquid cooling unit is controlled to switch to the gravity natural cooling mode, including: Read the updated target state to determine the current operating frequency of the liquid pump, the operating duration of the liquid pump, and the liquid supply temperature T o ; Reading the ambient temperature and obtaining a second temperature threshold; When the ambient temperature is less than the second temperature threshold, determining whether the current operating frequency of the liquid pump is the lowest operating frequency; If the current operating frequency of the liquid pump is the lowest operating frequency, determining whether the operating duration of the liquid pump reaches a first preset time threshold; When the running duration of the liquid pump is equal to or greater than the first preset time threshold, the preset liquid supply temperature threshold T is obtained. os The maximum allowable value T os +b; Set the supply temperature T o With the maximum allowable value T os +b for comparison, when T o ≤T os +b, determining whether the switching from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds a second preset time threshold; If the time from the gravity natural cooling mode to the liquid pump natural cooling mode exceeds the second preset time threshold, it is determined that the second preset condition is met; When the second preset condition is reached, the energy storage battery liquid cooling unit is controlled to switch to the gravity natural cooling mode.

6. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 1, characterized in that: In step 2, the target state of the energy storage battery liquid cooling unit is collected in real time, including: Read the structural composition of the energy storage battery liquid cooling unit, and build a status monitoring window for each structure according to the structural composition of the energy storage battery liquid cooling unit; Obtain the monitoring dimensions for dynamic monitoring of each structure in the energy storage battery liquid cooling unit; Create a sub-status monitoring window in the status monitoring window of each structure according to the monitoring dimension of dynamic monitoring of each structure in the energy storage battery liquid cooling unit; According to the state monitoring window and the sub-state monitoring window, the collected working operation data of the energy storage battery liquid cooling unit is stored and analyzed to obtain the target state of the energy storage battery liquid cooling unit.

7. A natural cooling control method for a liquid cooling unit of an energy storage battery according to claim 6, characterized in that: According to the status monitoring window and the sub-status monitoring window, the collected working data of the energy storage battery liquid cooling unit is stored and analyzed, including: Obtain the dimension identifier of the monitoring dimension, and encapsulate the dimension identifier in the sub-status monitoring window; Construct a data receiving end, and connect the data receiving end with each state monitoring window, and each state monitoring window is connected with the corresponding sub-state monitoring window; Based on the data receiving end, the working operation data of the energy storage battery liquid cooling unit is collected in real time, and the working operation data is read according to the data receiving end, the structural keywords in the working operation data are determined, and the working operation data is divided according to the structural keywords to obtain multiple sub-working operation data; Transmit sub-task operation data to the corresponding status monitoring window; Read the sub-work operation data according to the status monitoring window to determine the data identifier of the sub-work operation data; Match the data identifier of the sub-work running data with the dimension identifier, and transmit the sub-work running data to the corresponding sub-status monitoring window according to the matching result; Read the sub-work operation data according to the sub-state monitoring window, and determine the sub-target state of the sub-work operation data corresponding to each sub-state monitoring window; The sub-target states corresponding to each sub-state monitoring window are integrated to obtain the target state of each structure in the energy storage battery liquid cooling unit.

8. The natural cooling control method of the energy storage battery liquid cooling unit according to claim 7, characterized in that: After obtaining the target state of each structure in the energy storage battery liquid cooling unit, it also includes: The target status of each structure is synthesized to generate a status report of the energy storage battery liquid cooling unit; Obtain the time information when the target state is determined, and add a time tag to the state report according to the time information to obtain the target state report; At the same time, the target status report is transmitted to the monitoring terminal.

9. A natural cooling control system for a liquid cooling unit of an energy storage battery, characterized in that: include: The first control start module is used to control the energy storage battery liquid cooling unit to start the gravity natural cooling mode and cool the energy storage battery in the gravity natural cooling mode; The state acquisition module is used to collect the target state of the energy storage battery liquid cooling unit in real time; The second control start module controls the energy storage battery liquid cooling unit to switch to a liquid pump natural cooling mode when the target state reaches a first preset condition, and performs cooling control on the energy storage battery according to the liquid pump natural cooling mode; The mode switching module is used to update the target state in real time based on the cooling result, and when the target state reaches the second preset condition, control the energy storage battery liquid cooling unit to switch to the gravity natural cooling mode.

10. A natural cooling control system for an energy storage battery liquid cooling unit according to claim 9, characterized in that: In the first control start module, the components of the energy storage battery liquid cooling unit include: a compressor (1), a return air temperature sensor (2), a return liquid temperature sensor (3), a liquid supply temperature sensor (4), a medium heat exchanger (5), an electronic expansion valve (6), a check valve 1 (7), a liquid pump (8), an ambient temperature sensor (9), a fan (10), an outer heat exchanger (11), a return air pressure sensor (12), a check valve 2 (13), a check valve 3 (14), an exhaust pressure sensor (15), and an exhaust temperature sensor (16).

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