A chiller energy-saving and noise reduction control method and terminal

Abstract

This invention discloses an energy-saving and noise-reduction control method and terminal for a chiller unit, including the following steps: S1, acquiring the ambient temperature, setting the initial operating state of the chiller unit based on the ambient temperature, and running the chiller unit in the initial state for a first set time; Step S2, acquiring the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient, calculating the cooling demand based on the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient, and adjusting the operating state of the chiller unit according to the cooling demand and rated cooling capacity. It can be seen that by adjusting the operating state of the chiller unit based on the cooling demand and rated cooling capacity, the chiller unit can operate in a low-power, low-noise state when unnecessary, thereby reducing the power consumption and noise of the liquid cooling system during operation.

Description

Technical Field

[0001] This invention relates to the field of energy storage system technology, and in particular to an energy-saving and noise-reduction control method and terminal for chiller units. Background Technology

[0002] With the promotion and application of new energy sources such as solar and wind power, energy storage technology has also developed. Lithium batteries have gradually become the mainstream energy storage product due to their advantages such as high energy density, long service life, high rated voltage, ability to withstand high temperature and high power conditions, very low self-discharge rate, light weight, green and environmentally friendly properties, and minimal water consumption during production.

[0003] Currently, liquid cooling technology is increasingly widely used in the integration of containerized energy storage systems, offering significant advantages such as energy saving, small temperature difference, and long battery life. However, older liquid cooling systems are mostly used in industrial and other fields, and their noise levels are typically above 80 dB, making them unsuitable for urban areas, office buildings, and other areas with high population density. Furthermore, industrial and commercial energy storage has stringent requirements regarding cost and electricity consumption, necessitating further development of energy-saving technologies for liquid-cooled units. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an energy-saving and noise-reducing control method and terminal for water chiller units, which can reduce the power consumption and noise during the operation of liquid cooling systems.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A method for energy saving and noise reduction control of a chiller unit, comprising the following steps:

[0007] S1. Obtain the ambient temperature, set the initial operating state of the chiller unit according to the ambient temperature, and make the chiller unit run in the initial state for a first set time.

[0008] S2. Obtain the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Calculate the cooling demand based on the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Adjust the operating status of the chiller unit according to the cooling demand and rated cooling capacity.

[0009] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0010] A chiller unit energy-saving and noise-reducing control terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the steps described above.

[0011] The beneficial effects of the present invention are as follows: a method and terminal for energy saving and noise reduction control of a chiller unit, which adjusts the operating state of the chiller unit according to the cooling demand and rated cooling capacity, so that the chiller unit operates in a low power consumption and low noise state when unnecessary, thereby reducing the power consumption and noise of the liquid cooling system during operation. Attached Figure Description

[0012] Figure 1 This is a schematic flowchart of an energy-saving and noise-reduction control method for a chiller unit according to an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the energy storage system according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the chiller unit involved in the embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the structure of an energy-saving and noise-reducing control terminal for a chiller unit according to an embodiment of the present invention.

[0016] Label Explanation:

[0017] 1. An energy-saving and noise-reducing control terminal for a chiller unit; 2. Processor; 3. Memory; 4. Equipment compartment; 5. Chiller unit; 6. Battery compartment; 7. Electrical cabinet; 8. Battery cluster liquid cooling device; 9. Condenser fan; 10. Outdoor heat exchanger; 11. First solenoid valve; 12. Water pump; 13. Second solenoid valve; 14. Heat exchanger; 15. Compressor; 16. Condenser; 17. Expansion valve. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figure 1-3 A method for energy saving and noise reduction control of a chiller unit, comprising the following steps:

[0020] S1. Obtain the ambient temperature, set the initial operating state of the chiller unit according to the ambient temperature, and make the chiller unit run in the initial state for a first set time.

[0021] S2. Obtain the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Calculate the cooling demand based on the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Adjust the operating status of the chiller unit according to the cooling demand and rated cooling capacity.

[0022] As can be seen from the above description, the beneficial effects of the present invention are as follows: a chiller unit energy-saving and noise reduction control method, which adjusts the operating state of the chiller unit according to the cooling demand and rated cooling capacity, so that the chiller unit operates in a low power consumption and low noise state when unnecessary, thereby reducing the power consumption and noise of the liquid cooling system during operation.

[0023] Furthermore, the chiller unit includes a heat exchanger, a battery cluster liquid cooling device, a water pump, a first solenoid valve, a second solenoid valve, an outdoor heat exchanger, a compressor, an expansion valve, a condenser, and a condensing fan. The first end of the first coil of the heat exchanger is connected back to the second end of the first coil via the compressor, the condenser, and the expansion valve. The first end of the second coil of the heat exchanger is connected back to the second end of the second coil via the second solenoid valve, the first solenoid valve, and the outdoor heat exchanger. One end of the water pump is connected between the first and second solenoid valves, and the other end is connected to one end of the battery cluster liquid cooling device. The other end of the battery cluster liquid cooling device is connected to the second end of the second coil of the heat exchanger.

[0024] The step S1 comprises:

[0025] Step S11: Determine whether the ambient temperature is in the high temperature range. If so, set the first solenoid valve to be closed and the second solenoid valve to be open, and the refrigeration circuit to work. Determine whether the ambient temperature is in the low temperature range. If so, set the first solenoid valve to be open and the second solenoid valve to be closed, and the refrigeration circuit to be inactive. The condenser fan and the outdoor heat exchanger work to cool the coolant.

[0026] Step S12: Set the compressor's duty cycle and the fan speed according to the ambient temperature.

[0027] As described above, the system divides the ambient temperature range and uses solenoid valves to control the cooling scheme of the chiller unit, allowing the chiller unit to operate at a lower power consumption.

[0028] Furthermore, the high temperature range specifically refers to an ambient temperature greater than or equal to 0 degrees and less than or equal to 45 degrees, and the low temperature range specifically refers to a temperature less than 0 degrees Celsius and greater than or equal to -40 degrees Celsius.

[0029] As can be seen from the above description, the specific division of the high temperature range and the low temperature range is given.

[0030] Furthermore, step S12 specifically involves:

[0031] If the ambient temperature is in the high temperature range, determine whether the ambient temperature is greater than or equal to 35 degrees Celsius. If so, the chiller unit will run in high temperature and high power mode for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to 25 degrees Celsius. If so, the chiller unit will run in high temperature and medium power mode for a first set time. Otherwise, the chiller unit will run in high temperature and low power mode for a first set time.

[0032] If the ambient temperature is in the low-temperature range, determine whether the ambient temperature is greater than or equal to -10 degrees Celsius and less than 0 degrees Celsius. If so, the chiller unit will operate in a low-temperature, high-power state for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -20 degrees Celsius and less than -10 degrees Celsius. If so, the chiller unit will operate in a low-temperature, medium-power state for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -30 degrees Celsius and less than -20 degrees Celsius. If so, the chiller unit will operate in a low-temperature, low-power state for a first set time. Otherwise, the chiller unit will operate in a low-temperature, lowest-power state for a first set time.

[0033] As described above, the initial operating state is controlled according to the specific temperature, thereby ensuring stable operation of the system upon startup.

[0034] Further,

[0035] If the ambient temperature is in the high temperature range, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at high temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than or equal to 50% of the rated cooling capacity, the chiller unit will be operated at high temperature and medium power. Otherwise, the chiller unit will be operated at high temperature and low power.

[0036] If the ambient temperature is in the low-temperature range and greater than or equal to -30 degrees Celsius, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at low temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than or equal to 50% of the rated cooling capacity, the chiller unit will be operated at low temperature and medium power. Otherwise, the chiller unit will be operated at low temperature and low power.

[0037] If the ambient temperature is below -30 degrees Celsius but above or equal to -40 degrees Celsius, determine if the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will operate at low temperature and medium power. Otherwise, determine if the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than 50% of the rated cooling capacity, the chiller unit will operate at low temperature and low power. Otherwise, the chiller unit will operate at low temperature and minimum power.

[0038] As can be seen from the above description, a specific scheme for controlling the operation of the chiller unit according to the cooling demand has been given.

[0039] Furthermore, the high-temperature high-power state specifically means that the compressor operates at 80% duty cycle and the fan operates at 80% speed; the high-temperature medium-power state specifically means that the compressor operates at 50% duty cycle and the fan operates at 50% speed; the high-temperature low-power state specifically means that the compressor operates at 30% duty cycle and the fan operates at 35% speed; the low-temperature high-power state specifically means that the compressor does not operate and the fan operates at 80% speed; the low-temperature medium-power state specifically means that the compressor does not operate and the fan operates at 50% speed; the low-temperature low-power state specifically means that the compressor does not operate and the fan operates at 35% speed; and the low-temperature minimum-power state specifically means that the compressor does not operate and the fan operates at 25% speed.

[0040] As described above, the noise level is below 70 dB and the power consumption is 80% of the rated value under high temperature and high power conditions; the noise level is below 60 dB and the power consumption is 65% of the rated value under high temperature and medium power conditions; the noise level is below 50 dB and the power consumption is 45% of the rated value under high temperature and low power conditions; the noise level is below 70 dB and the power consumption is 30% of the rated value under low temperature and high power conditions; the noise level is below 60 dB and the power consumption is 25% of the rated value under low temperature and medium power conditions; the noise level is below 50 dB and the power consumption is 20% of the rated value under low temperature and low power conditions; and the noise level is below 40 dB and the power consumption is 15% of the rated value under the lowest low temperature and lowest power conditions.

[0041] Furthermore, in step S2, the cooling requirement is specifically calculated according to the formula (Tcell-TL)*Num*h, where Tcell is the average temperature of the battery cell, TL is the temperature of the coolant, Num is the number of battery cells, and h is the heat transfer coefficient of the battery cell.

[0042] As can be seen from the above description, the calculation of cooling demand has been achieved.

[0043] A chiller unit energy-saving and noise-reducing control terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the steps described above.

[0044] This invention is used to control the operation of the chiller unit of an energy storage system, so as to reduce the power consumption and noise of the liquid cooling system during the operation of the energy storage system.

[0045] Please refer to Figure 1 Embodiment 1 of the present invention is as follows:

[0046] A method for energy-saving and noise-reduction control of chiller units, which is applied to Figure 3 In the chiller unit 5 shown, the chiller unit is located as follows: Figure 2The energy storage system shown includes an equipment compartment 4 and a battery compartment 6. A chiller unit 5 is placed in the equipment compartment 4, and an electrical cabinet 7 is installed in the battery compartment 6. The chiller unit 5 is used to cool the individual battery clusters in the electrical cabinet 7. The chiller unit 5 includes a heat exchanger 14, a battery cluster liquid cooling device 8, a water pump 12, a first solenoid valve 11, a second solenoid valve 13, an outdoor heat exchanger 10, a compressor 15, an expansion valve 17, a condenser 16, and a condensing fan 9. The first end of the first coil of the heat exchanger 14 is connected back to the second end of the first coil after passing through the compressor 15, the condenser 16, and the expansion valve 17. The first end of the second coil of the heat exchanger 14 is connected back to the second end of the second coil after passing through the second solenoid valve 13, the first solenoid valve 11, and the outdoor heat exchanger 10. One end of the water pump 12 is connected between the first and second solenoid valves, and the other end is connected to one end of the battery cluster liquid cooling device 8. The other end of the battery cluster liquid cooling device 8 is connected to the second end of the second coil of the heat exchanger 14. The condenser fan 9 is used for heat exchange between the condenser 16 and the outdoor heat exchanger 10.

[0047] The energy-saving and noise-reduction control method for a chiller unit includes the following steps:

[0048] S1. Obtain the ambient temperature, set the initial operating state of the chiller unit based on the ambient temperature, and make the chiller unit run in the initial state for a first set time.

[0049] Specifically, it includes:

[0050] Step S11: Determine whether the ambient temperature is in the high temperature range. If so, set the first solenoid valve to close and the second solenoid valve to open. Determine whether the ambient temperature is in the low temperature range. If so, set the first solenoid valve to open and the second solenoid valve to close.

[0051] In this embodiment, the high temperature range specifically refers to an ambient temperature greater than or equal to 0 degrees and less than or equal to 45 degrees, and the low temperature range specifically refers to a temperature less than 0 degrees Celsius and greater than or equal to -40 degrees Celsius.

[0052] That is, when the ambient temperature is in the high-temperature range, the first solenoid valve 11 is closed and the second solenoid valve 13 is open, and the refrigeration circuit (compressor 15, condenser 16, condenser fan 9, heat exchanger 14, expansion valve 17) operates normally to cool the battery pack water. When the ambient temperature is in the low-temperature range, the first solenoid valve 11 is open and the second solenoid valve 13 is closed, the refrigeration circuit does not work, achieving maximum energy saving at low temperatures, and the condenser fan 9 and the outdoor heat exchanger 10 work to directly cool the coolant.

[0053] Step S12: Set the compressor's duty cycle and the fan speed according to the ambient temperature.

[0054] Specifically, if the ambient temperature is in the high temperature range, it is determined whether the ambient temperature is greater than or equal to 35 degrees Celsius. If so, the chiller unit is operated in a high temperature and high power state for a first set time. Otherwise, it is determined whether the ambient temperature is greater than or equal to 25 degrees Celsius. If so, the chiller unit is operated in a high temperature and medium power state for a first set time. Otherwise, it is determined whether the ambient temperature is greater than or equal to 0 degrees Celsius and less than 25 degrees Celsius. If so, the chiller unit is operated in a high temperature and low power state for a first set time.

[0055] If the ambient temperature is in the low-temperature range, determine whether the ambient temperature is greater than or equal to -10 degrees Celsius and less than 0 degrees Celsius. If so, the chiller unit will operate in low-temperature, high-power mode for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -20 degrees Celsius and less than -10 degrees Celsius. If so, the chiller unit will operate in low-temperature, medium-power mode for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -30 degrees Celsius and less than -20 degrees Celsius. If so, the chiller unit will operate in low-temperature, low-power mode for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -40 degrees Celsius and less than -30 degrees Celsius. If so, the chiller unit will operate in low-temperature, lowest-power mode for a set time.

[0056] In this embodiment, the first set duration can be, for example, 30 minutes. In other equivalent embodiments, it can also be adjusted according to actual needs.

[0057] In this embodiment, the high temperature and high power state specifically means that the compressor operates at 80% duty cycle and the fan operates at 80% speed; the high temperature and medium power state specifically means that the compressor operates at 50% duty cycle and the fan operates at 50% speed; the high temperature and low power state specifically means that the compressor operates at 30% duty cycle and the fan operates at 35% speed; the low temperature and high power state specifically means that the compressor does not operate and the fan operates at 80% speed; the low temperature and medium power state specifically means that the compressor does not operate and the fan operates at 50% speed; the low temperature and low power state specifically means that the compressor does not operate and the fan operates at 35% speed; and the low temperature and lowest power state specifically means that the compressor does not operate and the fan operates at 25% speed.

[0058] In this embodiment, the noise level is below 70dB and the power consumption is 80% of the rated value when operating under high temperature and high power conditions; the noise level is below 60dB and the power consumption is 65% of the rated value when operating under high temperature and medium power conditions; and the noise level is below 50dB and the power consumption is 45% of the rated value when operating under high temperature and low power conditions.

[0059] Noise level is below 70dB and power consumption is 30% of the rated value when operating at low temperature and high power; noise level is below 60dB and power consumption is 25% of the rated value when operating at low temperature and medium power; noise level is below 50dB and power consumption is 20% of the rated value when operating at low temperature and low power; noise level is below 40dB and power consumption is 15% of the rated value when operating at low temperature and lowest power.

[0060] Step S2: Obtain the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Calculate the cooling demand based on the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Adjust the operating status of the chiller unit according to the cooling demand and rated cooling capacity.

[0061] Specifically, the cooling demand is calculated using the formula (Tcell-TL)*Num*h, where Tcell is the average temperature of the battery cells, specifically the average temperature of all battery cells, TL is the coolant temperature, Num is the number of battery cells, and h is the heat transfer coefficient of the battery cells.

[0062] Specifically, if the ambient temperature is in the high temperature range, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at high temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If so, the chiller unit will be operated at high temperature and medium power. Otherwise, determine whether the cooling demand is less than 50% of the rated cooling capacity. If so, the chiller unit will be operated at high temperature and low power.

[0063] If the ambient temperature is in the low-temperature range and greater than or equal to -30 degrees Celsius, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at low temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If so, the chiller unit will be operated at low temperature and medium power. Otherwise, determine whether the cooling demand is less than 50% of the rated cooling capacity. If so, the chiller unit will be operated at low temperature and low power.

[0064] If the ambient temperature is below -30 degrees Celsius but above or equal to -40 degrees Celsius, determine if the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will operate at low temperature and medium power. Otherwise, determine if the cooling demand is greater than or equal to 50% of the rated cooling capacity. If so, the chiller unit will operate at low temperature and low power. Otherwise, determine if the cooling demand is less than 50% of the rated cooling capacity. If so, the chiller unit will operate at low temperature and minimum power.

[0065] Please refer to Figure 4 Embodiment two of the present invention is as follows:

[0066] A chiller unit energy-saving and noise-reducing control terminal 1 includes a memory 3, a processor 2, and a computer program stored in the memory 3 and run on the processor 2. When the processor 2 executes the computer program, it implements the steps of the above embodiment 1.

[0067] In summary, the present invention provides an energy-saving and noise-reducing control method and terminal for a chiller unit, which adjusts the operating state of the chiller unit according to the cooling demand and rated cooling capacity, so that the chiller unit operates in a low-power and low-noise state when unnecessary, thereby reducing the power consumption and noise of the liquid cooling system during operation.

[0068] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for energy-saving and noise-reduction control of a chiller unit, characterized in that, Including the following steps: S1. Obtain the ambient temperature, set the initial operating state of the chiller unit according to the ambient temperature, and make the chiller unit run in the initial state for a first set time. S2. Obtain the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Calculate the cooling demand based on the average cell temperature, coolant temperature, number of cells, and cell heat transfer coefficient. Adjust the operating status of the chiller unit according to the cooling demand and rated cooling capacity. The chiller unit includes a heat exchanger, a battery cluster liquid cooling device, a water pump, a first solenoid valve, a second solenoid valve, an outdoor heat exchanger, a compressor, an expansion valve, a condenser, and a condensing fan. The first end of the first coil of the heat exchanger is connected back to the second end of the first coil via the compressor, the condenser, and the expansion valve. The first end of the second coil of the heat exchanger is connected back to the second end of the second coil via the second solenoid valve, the first solenoid valve, and the outdoor heat exchanger. One end of the water pump is connected between the first and second solenoid valves, and the other end is connected to one end of the battery cluster liquid cooling device. The other end of the battery cluster liquid cooling device is connected to the second end of the second coil of the heat exchanger. The step S1 comprises: Step S11: Determine whether the ambient temperature is in the high temperature range. If so, set the first solenoid valve to be closed and the second solenoid valve to be open, and the refrigeration circuit to work. Determine whether the ambient temperature is in the low temperature range. If so, set the first solenoid valve to be open and the second solenoid valve to be closed, and the refrigeration circuit to be inactive. The condenser fan and the outdoor heat exchanger work to cool the coolant. Step S12: Set the compressor's duty cycle and the fan speed according to the ambient temperature; The high temperature range specifically refers to an ambient temperature greater than or equal to 0 degrees Celsius and less than or equal to 45 degrees Celsius, and the low temperature range specifically refers to a temperature less than 0 degrees Celsius and greater than or equal to -40 degrees Celsius. Step S12 specifically involves: If the ambient temperature is in the high temperature range, determine whether the ambient temperature is greater than or equal to 35 degrees Celsius. If so, the chiller unit will run in high temperature and high power mode for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to 25 degrees Celsius. If so, the chiller unit will run in high temperature and medium power mode for a first set time. Otherwise, the chiller unit will run in high temperature and low power mode for a first set time. If the ambient temperature is in the low-temperature range, determine whether the ambient temperature is greater than or equal to -10 degrees Celsius and less than 0 degrees Celsius. If so, the chiller unit will operate in a low-temperature, high-power state for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -20 degrees Celsius and less than -10 degrees Celsius. If so, the chiller unit will operate in a low-temperature, medium-power state for a first set time. Otherwise, determine whether the ambient temperature is greater than or equal to -30 degrees Celsius and less than -20 degrees Celsius. If so, the chiller unit will operate in a low-temperature, low-power state for a first set time. Otherwise, the chiller unit will operate in a low-temperature, lowest-power state for a first set time.

2. The energy-saving and noise-reduction control method for a chiller unit according to claim 1, characterized in that, If the ambient temperature is in the high temperature range, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at high temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than or equal to 50% of the rated cooling capacity, the chiller unit will be operated at high temperature and medium power. Otherwise, the chiller unit will be operated at high temperature and low power. If the ambient temperature is in the low-temperature range and greater than or equal to -30 degrees Celsius, determine whether the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will be operated at low temperature and high power. Otherwise, determine whether the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than or equal to 50% of the rated cooling capacity, the chiller unit will be operated at low temperature and medium power. Otherwise, the chiller unit will be operated at low temperature and low power. If the ambient temperature is below -30 degrees Celsius but above or equal to -40 degrees Celsius, determine if the cooling demand is greater than or equal to 80% of the rated cooling capacity. If so, the chiller unit will operate at low temperature and medium power. Otherwise, determine if the cooling demand is greater than or equal to 50% of the rated cooling capacity. If the cooling demand is greater than 50% of the rated cooling capacity, the chiller unit will operate at low temperature and low power. Otherwise, the chiller unit will operate at low temperature and minimum power.

3. The energy-saving and noise-reduction control method for a chiller unit according to claim 1, characterized in that, The high-temperature, high-power state specifically means that the compressor operates at 80% duty cycle and the fan operates at 80% speed. The high-temperature, medium-power state specifically means that the compressor operates at 50% duty cycle and the fan operates at 50% speed. The high-temperature, low-power state specifically means that the compressor operates at 30% duty cycle and the fan operates at 35% speed. The low-temperature, high-power state specifically means that the compressor does not operate and the fan operates at 80% speed. The low-temperature, medium-power state specifically means that the compressor does not operate and the fan operates at 50% speed. The low-temperature, low-power state specifically means that the compressor does not operate and the fan operates at 35% speed. The low-temperature, lowest-power state specifically means that the compressor does not operate and the fan operates at 25% speed.

4. The energy-saving and noise-reduction control method for a chiller unit according to claim 1, characterized in that, In step S2, the cooling requirement is specifically calculated according to the formula (Tcell-TL)*Num*h, where Tcell is the average temperature of the battery cell, TL is the temperature of the coolant, Num is the number of battery cells, and h is the heat transfer coefficient of the battery cell.

5. A chiller unit energy-saving and noise-reduction control terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1-4.

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