Control method of cooling system and cooling device

Abstract

The invention provides a control method of a cooling system and a cooling device, the cooling system is used for cooling a to-be-cooled target, the cooling system comprises a cooling module, a pump and a circularly flowing liquid cooling medium, and the control method comprises the following steps: detecting the temperature rise rate (Tw / t) ct of the liquid cooling medium in unit time and comparing the temperature rise rate (Tw / t) ct with a set reference rate (Tw / t) set; when (Tw / t) ct is greater than (Tw / t) set, the cooling system enters an advanced pre-cooling working mode, and the cooling module is started to reduce the temperature of the liquid cooling medium in advance; and when (Tw / t) ct is smaller than or equal to (Tw / t) set, the cooling system enters a normal working mode. According to the invention, the heat dissipation demand of the to-be-cooled target is pre-judged through the temperature rise rate of the liquid cooling medium, so that the temperature of the to-be-cooled target is pre-cooled in advance, and the temperature rise rate of the to-be-cooled target is quickly followed, thereby achieving the purpose of quickly responding to the heat dissipation demand of the to-be-cooled target, and enhancing the operation stability of the to-be-cooled target.

Description

Technical Field

[0001] The present application relates to the field of refrigeration control technology, and in particular to a control method and a cooling device for a cooling system. Background Art

[0002] In recent years, the application of liquid-cooled battery energy storage systems has become more and more common. Battery energy storage systems include battery cells and liquid cooling units for cooling the battery cells. Different from the traditional heating end, the heat conduction of the battery cells has a time lag, which causes the temperature rise rate of the battery cells to be much faster than the temperature rise rate of the refrigerant in the liquid cooling unit. In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art:

[0003] On the one hand, the existing liquid cooling unit uses water temperature as the control target, and usually sets a low target water temperature to increase the temperature difference between the water temperature and the battery cell. The water temperature is set low and the high temperature difference between the water temperature and the battery cell is maintained to enhance the heat dissipation effect. However, this control method will cause the unit to maintain a high energy consumption operation state for a long time, resulting in serious energy loss, poor unit operation efficiency, and no energy saving. On the other hand, the liquid cooling unit does not pre-cool the battery before charging and discharging, resulting in the inability to quickly respond to the heat dissipation needs of the battery cell, resulting in the inability to keep up with the temperature rise rate of the battery cell during charging and discharging, and the inability to effectively dissipate the heat for the battery cell. Summary of the invention

[0004] In view of this, the present application provides a control method and a cooling device for a cooling system, aiming to effectively solve the problem that the existing liquid cooling unit cannot quickly respond to the heat dissipation requirements of the battery cell.

[0005] The present application provides a control method for a cooling system, wherein the cooling system is used to cool a target to be cooled, the cooling system comprises a cooling module, a pump, and a liquid cooling medium circulating between the target to be cooled, the cooling module, and the pump, the cooling module is used to exchange heat with the liquid cooling medium, the pump is used to drive the liquid cooling medium to circulate, and the control method comprises:

[0006] When the cooling module is in standby mode and the pump is started, the temperature rise rate (ΔT w / t) ct And with the set reference rate (△T w / t) set Compare;

[0007] When (△T w / t) ct >(△T w / t) set When the cooling module is turned on, the temperature of the liquid cooling medium is lowered in advance.

[0008] In one embodiment, when (ΔT w / t) ct ≤(△T w / t) set When the cooling system enters a normal working mode, the normal working mode includes: setting n temperature levels for the target to be cooled, which are T bat1 ,……,T bat(n-1) 、T batn , and T bat1 >……>T bat(n-1) >T batn , set n temperature levels for the liquid cooling medium, which are T set1 ,……,T set(n-1) 、T setn , and T set1 <……<T set(n-1) <T setn ; The control method comprises:

[0009] Detect the current temperature T of the target to be cooled bat and comparing it with the set temperature of the target to be cooled;

[0010] When T batn1 <T bat <T batn2 When the temperature of the liquid cooling medium is set to T setn2 ;

[0011] When T bat =T batn1 When the temperature of the liquid cooling medium is set to T setn1 ;

[0012] When T bat =T batn2 When the temperature of the liquid cooling medium is maintained at T setn2 ;

[0013] Wherein, n is an integer greater than or equal to 2, 1<n1≤n, 1≤n2<n, n1>n2, and n1 and n2 are adjacent integers.

[0014] In one embodiment, a demand coefficient is added to each of the n temperature levels set for the liquid cooling medium, and the demand coefficient is 1+k, where the value range of k is 0% to 10%.

[0015] In one embodiment, the control method includes: after the cooling system is started, the pump runs at a first speed.

[0016] In one embodiment, the control method includes:

[0017] When the temperature of the liquid cooling medium is set to T setn3(1+k), detect the current temperature T of the liquid cooling medium x ;

[0018] When T x ≤T setn3 When (1+k), the pump maintains the first speed;

[0019] When T x >T setn3 (1+k), the pump runs at a second speed, the cooling module is started, and the second speed is greater than the first speed;

[0020] Wherein, 1≤n3≤n, and n3 is an integer.

[0021] In one embodiment, the control method includes:

[0022] The lowest critical temperature T of the target to be cooled is introduced baty , and T baty <T batn ;

[0023] When T bat <T baty When the cooling module stops running;

[0024] When T bat >T batn When , the cooling system enters the normal working mode.

[0025] In one embodiment, the control method includes:

[0026] When T baty ≤T bat <T batn When the temperature of the liquid cooling medium is set to T setn (1+k), detect the current temperature T of the liquid cooling medium x ;

[0027] When T x ≤T setn When (1+k), the pump maintains the first speed;

[0028] When T x >T setn When (1+k), the cooling module starts.

[0029] In one embodiment, the control method includes:

[0030] Introduce the warning temperature T of the target to be cooled bat0 , and T bat0 >T bat1 ;

[0031] When T bat ≥T bat0 When the cooling module is turned on, it operates at maximum power.

[0032] In one embodiment, the detection position of the liquid cooling medium in detecting the temperature and the temperature rise rate of the liquid cooling medium is the outlet of the target to be cooled.

[0033] The present application also provides a cooling device, which operates according to the control method of the cooling system as described above.

[0034] In summary, the present application provides a control method and a cooling device for a cooling system. The cooling system is used to cool a target to be cooled. The cooling system includes a cooling module, a pump, and a liquid cooling medium circulating between the target to be cooled, the cooling module, and the pump. The cooling module is used to exchange heat with the liquid cooling medium to cool the liquid cooling medium. The pump is used to drive the liquid cooling medium to circulate. The control method includes: when the cooling module is in a standby state and the pump is started, detecting the temperature rise rate (△T w / t) ct And with the set reference rate (△T w / t) set Compare; when (△T w / t) ct >(△T w / t) set When (△T w / t) ct ≤(△T w / t) set The cooling system enters the normal working mode. The present application predicts the heat dissipation demand of the target to be cooled by the temperature rise rate of the liquid cooling medium, so as to realize the advance precooling of the temperature of the target to be cooled, quickly follow the temperature rise rate of the target to be cooled, and then achieve the purpose of quickly responding to the heat dissipation demand of the target to be cooled, and enhance the stability of the operation of the target to be cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a flow chart of a control method for a cooling system of the present application.

[0036] Figure 2 This is a schematic diagram of the cooling system of the present application.

[0037] Figure 3 This is a schematic diagram of the principle of the cooling module of this application.

[0038] Reference numerals:

[0039] 10-cooling system; 12-battery energy storage system; 14-battery cell; 16-compressor; 18-cooling module; 20-liquid reservoir; 22-pump; 24-pipeline; 26-liquid cooling medium inlet; 28-liquid cooling medium outlet; 30-condenser; 32-evaporator; 34-throttle valve; 36-liquid storage tank; 38-pipeline. DETAILED DESCRIPTION

[0040] Before describing the embodiments in detail, it should be understood that the present application is not limited to the detailed structure or component arrangement described below or in the drawings in the present application. The present application may be an embodiment implemented in other ways. Moreover, it should be understood that the words and terms used herein are only used for descriptive purposes and should not be interpreted restrictively. The words "including", "comprising", "having" and the like used herein are meant to include the items listed thereafter, their equivalents and other additional items. In particular, when describing "a certain element", the present application does not limit the number of the element to one, but may also include multiple elements.

[0041] Please refer to Figure 1 As shown, the present application provides a control method for a cooling system, wherein the cooling system 10 is used to cool a target to be cooled, wherein the target to be cooled is, for example, a battery energy storage system 12, and specifically, it may be a battery cell 14 of the battery energy storage system 12. The cooling system 10 includes a cooling module 18, a pump 22, and a liquid cooling medium circulating between the battery energy storage system 12, the cooling module 18, and the pump 22, wherein the cooling module 18 is used to exchange heat with the liquid cooling medium to cool the liquid cooling medium, and the pump 22 is used to drive the liquid cooling medium to circulate. The control method includes: when the cooling module 18 is in a standby state and the pump 22 is started, detecting the temperature rise rate (△T w / t) ct And with the set reference rate (△T w / t) set Compare; when (△T w / t) ct >(△T w / t) set When (△T w / t) ct ≤(△T w / t) set, the cooling system 10 enters the normal working mode. That is to say, when the cooling module 18 is in the on state to cool the liquid-cooling medium, the system will not detect the temperature rise rate of the liquid-cooling medium. Only when the cooling module 18 is in the standby state, the system will detect the temperature rise rate of the liquid-cooling medium and compare it with the reference rate. The present application predicts the heat dissipation demand of the target to be cooled by increasing the temperature rise rate of the liquid-cooling medium, so as to achieve early pre-cooling of the temperature of the target to be cooled, quickly follow the temperature rise rate of the target to be cooled, and thus achieve the purpose of quickly responding to the heat dissipation demand of the target to be cooled, enhance the stability and reliability of the operation of the target to be cooled, and ensure that the target to be cooled is within a safe and reasonable temperature range.

[0042] In this embodiment, please refer to Figure 2 As shown, the cooling system 10 realizes cooling and lowering of the battery energy storage system 12 by means of liquid cooling heat exchange. Specifically, the cooling system 10 includes a battery energy storage system 12, a cooling module 18, a liquid reservoir 20, a pump 22, and a pipeline 24 connecting the above-mentioned components. The liquid cooling medium circulates between the components along the pipeline 24. The liquid cooling medium can be set to water, coolant or antifreeze, etc. The flow direction is shown by the arrow in the figure. Among them, the battery energy storage system 12 includes a liquid cooling medium inlet 26 and a liquid cooling medium outlet 28. The detection position of the liquid cooling medium in detecting the temperature and temperature rise rate of the liquid cooling medium is the outlet of the target to be cooled. The outlet of the target to be cooled is the liquid cooling medium outlet 28. That is, the above-mentioned detection of the temperature rise rate of the liquid cooling medium per unit time (△T w / t) ct And with the set reference rate (△T w / t) set Comparison refers to detecting the temperature rise rate of the liquid cooling medium at the liquid cooling medium outlet 28. The pump 22 is arranged between the liquid cooling medium inlet 26 and the liquid reservoir 20, and the cooling module 18 is arranged between the liquid cooling medium outlet 28 and the liquid reservoir 20. The liquid reservoir 20 is used to store the liquid cooling medium that does not enter the circulation, and the pump 22 is used to drive the liquid cooling medium to circulate in the pipeline 24. The cooling module 18 cools the liquid cooling medium with a higher temperature to a preset lower temperature through heat exchange with the liquid cooling medium. After the liquid cooling medium is cooled to the preset temperature, it enters the battery energy storage system 12 from the liquid cooling medium inlet 26. During the flow process, the liquid cooling medium absorbs the heat energy generated by the battery cell 14. The temperature of the liquid cooling medium rises and flows out from the liquid cooling medium outlet 28, and then enters the cooling module 18 to cool down. In this cycle, the battery energy storage system 12 is cooled by the liquid cooling medium.

[0043] For further information, please refer to Figure 3As shown, the cooling module 18 can be a traditional refrigeration mechanism, for example, the cooling module 18 includes a compressor 16, a condenser 30, an evaporator 32, a throttle valve 34, a liquid storage tank 36 and a pipe 38 connecting the above-mentioned various components. The refrigerant circulates along the pipe 38 between the various components, and the flow direction is shown by the arrow in the figure, absorbing heat and evaporating or releasing heat and condensing to achieve refrigeration. Specifically, the compressor 16 includes an air intake and an exhaust port, wherein the air intake is connected to the outlet of the evaporator 32, and the exhaust port is connected to the inlet of the condenser 30. The low-temperature and low-pressure refrigerant vapor formed by the endothermic evaporation of the evaporator 32 flows through the compressor 16, and the compressor 16 works on it to convert it into a high-temperature and high-pressure refrigerant gas, and transports it to the condenser 30 for condensation. The inlet of the condenser 30 is connected to the compressor 16, and the outlet is connected to the inlet of the liquid storage tank 36. The high-temperature and high-pressure refrigerant gas from the compressor 16 releases heat and liquefies in the process of flowing through the condenser 30, forming a medium-temperature and medium-pressure liquid refrigerant and transported to the liquid storage tank 36 from the outlet of the condenser 30. The liquid storage tank 36 is used to store refrigerant that does not enter the cycle, and its inlet is connected to the condenser 30, and its outlet is connected to the inlet of the throttle valve 34. The inlet of the throttle valve 34 is connected to the liquid storage tank 36, and the outlet is connected to the inlet of the evaporator 32. The throttle valve 34 has a throttling effect on the refrigerant flowing through, and the medium-temperature and medium-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after the throttling effect of the throttle valve 34. The startup of the cooling module 18 mentioned in the text can also be considered as the startup of the compressor 16.

[0044] Preferably, the cooling system 10 further includes a control module, the compressor 16 and the pump 22 are respectively connected to the control module, and the control module can control the start / stop, parameter adjustment, etc. of the compressor and the pump according to the control method of the present application. The control module can include a central processing unit and multiple temperature detectors, and the multiple temperature detectors can be used to detect the real-time temperature of the battery cell and the liquid cooling medium.

[0045] In this embodiment, the normal working mode of the cooling system 10 includes:

[0046] Set n temperature levels for the battery cell 14, which are T bat1 ,……,T bat(n-1) 、T batn , and T bat1 >……>T bat(n-1) >T batn , correspondingly, n temperature levels are set for the liquid cooling medium, namely T set1 ,……,T set(n-1) 、T setn , and T set1 <……<T set(n-1) <T setn, the n temperature levels of the battery cell 14 correspond to the n temperature levels of the liquid cooling medium according to the corner numbers; the control method includes:

[0047] Detect the current temperature T of the battery cell 14 bat and compares it with the set temperature of the battery cell 14;

[0048] When T batn1 <T bat <T batn2 When the temperature of the liquid cooling medium is set to T setn2 ;

[0049] When T bat =T batn1 When the temperature of the liquid cooling medium is set to T setn1 ;

[0050] When T bat =T batn2 When the temperature of the liquid cooling medium is maintained at T setn2 ;

[0051] Wherein, n is an integer greater than or equal to 2, 1<n1≤n, 1≤n2<n, n1>n2, and n1 and n2 are adjacent integers. By setting multiple gears for the battery cell temperature and setting the corresponding gradient target liquid cooling medium temperature control, the battery cell temperature can be controlled within a safe and reasonable range, and the target liquid cooling medium temperature is not too low to cause excessive power consumption of the cooling system, thereby achieving both energy saving and satisfying the purpose of battery cell heat dissipation. Moreover, the system adjusts the target temperature of the liquid cooling medium according to the battery cell temperature, and reasonably increases or decreases the load, so that the cooling system 10 operates in an energy-saving state, thereby improving energy efficiency.

[0052] After the cooling system 10 is started, the pump 22 operates at a first speed;

[0053] Preferably, a demand coefficient is added to each of the n temperature levels set for the liquid cooling medium, and the demand coefficient is 1+k, wherein the value range of k is 0% to 10%. The n temperature levels set for the liquid cooling medium are: T set1 (1+k), ..., T set(n-1) (1+k), T setn (1+k). If there is no additional demand coefficient, the cooling module 18 will shut down when the temperature of the liquid cooling medium drops after the system is started, and will start cooling again when the temperature of the liquid cooling medium rises after the shutdown, resulting in the problem of frequent start and stop of the cooling module 18. The present application can effectively prevent the frequent start and stop of the cooling module 18 by adding a demand coefficient to the temperature level of the liquid cooling medium.

[0054] When the temperature of the liquid cooling medium is set to T setn3 (1+k), detect the current temperature T of the liquid cooling mediumx ;

[0055] When T x ≤T setn3 When (1+k), the pump 22 maintains the first speed, at which time the temperature of the liquid cooling medium is lower than the corresponding set value, and there is no need to increase the flow rate of the liquid cooling medium to reduce the temperature of the liquid cooling medium;

[0056] When T x >T setn3 When (1+k), the pump 22 runs at the second speed, the compressor 16 is started, and the second speed is greater than the first speed. At this time, the temperature of the liquid cooling medium is higher than the corresponding set value. It is necessary to increase the flow rate of the liquid cooling medium and reduce the temperature of the liquid cooling medium with the help of the compressor 16 to achieve a rapid response to the heat dissipation demand of the battery cell 14;

[0057] Wherein, 1≤n3≤n, and n3 is an integer.

[0058] Furthermore, the minimum critical temperature T of the battery cell 14 is introduced. baty , and T baty <T batn ;

[0059] When T bat <T baty When , it indicates that the current battery cell temperature is lower than the set minimum critical temperature, the system does not need precooling, and the compressor 16 stops running;

[0060] When T bat >T batn When , the cooling system 10 enters the normal working mode.

[0061] When T baty ≤T bat <T batn When the temperature of the liquid cooling medium is set to T setn (1+k), detect the current temperature T of the liquid cooling medium x ;

[0062] When T x ≤T setn When (1+k), it indicates that the current temperature of the liquid cooling medium is lower than the corresponding set value, and the pump 22 maintains the first speed operation;

[0063] When T x >T setn When (1+k), it indicates that the current temperature of the liquid cooling medium is higher than the corresponding set value, and the compressor 16 is started to reduce the temperature of the liquid cooling medium.

[0064] Furthermore, the warning temperature T of the battery cell 14 is introduced. bat0 , and T bat0 >T bat1; By increasing the maximum warning temperature T of the battery cell 14 bat0 To warn that the battery energy storage system 12 is about to experience thermal runaway, the cooling system 10 releases its maximum cooling capacity and improves the cooling capacity in a short period of time, thereby gaining more processing time before thermal runaway occurs and achieving the purpose of improving reliability.

[0065] When T bat ≥T bat0 When the temperature of the battery energy storage system 12 is too high and thermal runaway is about to occur, the cooling system 10 releases the maximum power of the cooling module 18, allowing the compressor 16 to run at the maximum speed, thereby increasing the cooling capacity of the cooling module 18 in a short period of time, achieving rapid cooling, and gaining more processing time before thermal runaway occurs, thereby greatly reducing the incidence of thermal runaway and reducing losses.

[0066] Preferably, the temperature rise rate (ΔT w / t) ct , wherein the unit time is 4 to 6 minutes, preferably 5 minutes.

[0067] In some embodiments, the temperature of the battery cell can be differentiated according to the temperature characteristics (lifespan) of the battery cell during use. For example, five temperature levels are set, namely, T bat1 、T bat2 、T bat3 、T bat4 、T bat5 , that is, n = 5, the temperature of the above five levels is T bat1 >T bat2 >T bat3 >T bat4 >T bat5 ; In order to cope with the differentiated heat dissipation requirements under different battery core temperatures, the temperature control targets of the liquid cooling medium in the cooling system 10 are also divided into five levels, namely, T set1 、T set2 、T set3 、T set4 、T set5 , whose size is T set1 <T set2 <T set3 <T set4 <T set5 For example, the five temperature control targets of the liquid cooling medium can be given demand coefficients, which are: T set1 (1+k), T set2 (1+k), T set3 (1+k), T set4 (1+k), T set5(1+k). By setting a target liquid cooling medium temperature control with a gradient according to the battery cell temperature, it is ensured that the battery cell temperature is controlled within a reasonable range, and the target temperature of the liquid cooling medium is not too low to cause excessive power consumption of the cooling module 18, thereby achieving the purpose of energy saving and heat dissipation of the battery cell 14.

[0068] For example, after the battery energy storage system 12 is turned on, the cooling system 10 is started after receiving the power-on command, and the pump 22 runs at the first speed. At this time, the current battery cell temperature received by the cooling system 10 is T bat , the system determines T bat Between T bat4 With T bat5 and set the target temperature of the liquid cooling medium to T set4 (1+k), the current liquid cooling medium temperature T x With T set4 (1+k) comparison, if T x Less than T set4 (1+k), the pump 22 maintains the current first speed. If T x Greater than T set4 (1+k), the pump 22 is switched to operate at the second speed, and the compressor 16 is turned on.

[0069] During operation, if the battery cell temperature T bat Rise to T bat3 , the target temperature setting of the liquid cooling medium is changed to T set3 (1+k), the target liquid cooling medium temperature decreases, and the compressor 16 is loaded; if the battery core temperature T bat Down to T bat5 , the target temperature setting of the liquid cooling medium is changed to T set5 (1+k), the target liquid cooling medium temperature increases, and the compressor 16 reduces the load; if it is detected that the battery cell temperature is maintained at T bat4 , the cooling system will maintain the current target temperature setting of the liquid cooling medium and continue to operate.

[0070] When the system determines T bat <T bat5 When the temperature control target of the liquid cooling medium is set to T set5 (1+k), if T x >T set5 (1+k), the compressor 16 is normally turned on. x <T set5 (1+k), the pump 22 maintains the first speed; but if the system calculates T within 5 minutes x Rate of change (△T w / t) ct >(△T w / t) set , indicating that the battery cell temperature rises rapidly, the heat dissipation demand increases, and pre-cooling is required to cope with it. At this time, the system enters the pre-cooling working mode and turns on the compressor 16 to reduce the temperature of the liquid cooling medium in advance to achieve pre-cooling of the battery cell temperature in advance, so as to quickly respond to the heat dissipation demand of the battery cell 14; if T bat Continue to decrease, when T bat <T baty When T bat Continue to rise, T bat >T bat5 , it will run according to the relevant control logic of the normal working mode mentioned above.

[0071] When T bat Continue to rise to T bat0 When the temperature is about to rise (when thermal runaway is about to occur), the cooling system 10 releases the upper speed limit of the compressor 16, allowing the compressor 16 to run at the maximum speed, thereby increasing the cooling capacity of the cooling module 18 in a short period of time, achieving rapid cooling, and gaining more processing time before thermal runaway occurs, thereby greatly reducing the incidence of thermal runaway and reducing losses.

[0072] The present application also provides a cooling device, which includes the above-mentioned cooling system 10 and can be operated according to the control method as described above.

[0073] In summary, the present application provides a control method and a cooling device for a cooling system. The cooling system is used to cool a target to be cooled. The cooling system includes a cooling module, a pump, and a liquid cooling medium circulating between the target to be cooled, the cooling module, and the pump. The cooling module is used to exchange heat with the liquid cooling medium to cool the liquid cooling medium. The pump is used to drive the liquid cooling medium to circulate. The control method includes: when the cooling module is in a standby state and the pump is started, detecting the temperature rise rate (△T w / t) ct And with the set reference rate (△T w / t) set Compare; when (△T w / t) ct >(△T w / t) set When (△T w / t) ct ≤(△T w / t) setThe cooling system enters the normal working mode. The present application predicts the heat dissipation demand of the target to be cooled by the temperature rise rate of the liquid cooling medium, so as to realize the advance precooling of the temperature of the target to be cooled, quickly follow the temperature rise rate of the target to be cooled, and then achieve the purpose of quickly responding to the heat dissipation demand of the target to be cooled, and enhance the stability of the operation of the target to be cooled.

[0074] The concepts described herein may be implemented in other forms without departing from their spirit and characteristics. The specific embodiments disclosed should be considered illustrative rather than restrictive. Therefore, the scope of this application is determined by the appended claims rather than by the preceding description. Any changes within the literal meaning and equivalent scope of the claims should fall within the scope of these claims.

Claims

1. A method for controlling a cooling system, characterized in that: The cooling system is used to cool down the target to be cooled. The cooling system includes a cooling module, a pump, and a liquid cooling medium circulating between the target to be cooled, the cooling module, and the pump. The cooling module is used to exchange heat with the liquid cooling medium. The pump is used to drive the liquid cooling medium to circulate. The control method includes: When the cooling module is in standby mode and the pump is started, the temperature rise rate (ΔT w / t) ct and the set reference rate (△T w / t) set Compare; When (△T w / t) ct >(△T w / t) set When the cooling module is turned on, the temperature of the liquid cooling medium is lowered in advance.

2. The control method of the cooling system according to claim 1, characterized in that: When (△T w / t) ct ≤(△T w / t) set When the cooling system enters a normal working mode, the normal working mode includes: setting n temperature levels for the target to be cooled, which are T bat1 ,……,T bat(n-1) 、T batn , and T bat1 >……>T bat(n-1) >T batn , set n temperature levels for the liquid cooling medium, which are T set1 ,……,T set(n-1) 、T setn , and T set1 <……<T set(n-1) <T setn ; The control method comprises: Detect the current temperature T of the target to be cooled bat and comparing it with the set temperature of the target to be cooled; When T batn1 <T bat <T batn2 When the temperature of the liquid cooling medium is set to T setn2 ; When T bat =T batn1 When the temperature of the liquid cooling medium is set to T setn1 ; When T bat =T batn2 When the temperature of the liquid cooling medium is maintained at T setn2 ; Wherein, n is an integer greater than or equal to 2, 1<n1≤n, 1≤n2<n, n1>n2, and n1 and n2 are adjacent integers.

3. The control method of the cooling system according to claim 2, characterized in that: A demand coefficient is added to each of the n temperature levels set for the liquid cooling medium, and the demand coefficient is 1+k, wherein the value range of k is 0% to 10%.

4. The control method of the cooling system according to claim 3, characterized in that: The control method includes: after the cooling system is started, the pump runs at a first speed.

5. The control method of the cooling system according to claim 4, characterized in that: The control method comprises: When the temperature of the liquid cooling medium is set to T setn3 (1+k), detect the current temperature T of the liquid cooling medium x ; When T x ≤T setn3 When (1+k), the pump maintains the first speed; When T x >T setn3 (1+k), the pump runs at a second speed, the cooling module is started, and the second speed is greater than the first speed; Wherein, 1≤n3≤n, and n3 is an integer.

6. The control method of the cooling system according to claim 4, characterized in that: The control method comprises: The lowest critical temperature T of the target to be cooled is introduced baty , and T baty <T batn ; When T bat <T baty When the cooling module stops running; When T bat >T batn When , the cooling system enters the normal working mode.

7. The control method of the cooling system according to claim 6, characterized in that: The control method comprises: When T baty ≤T bat <T batn When the temperature of the liquid cooling medium is set to T setn (1+k), detect the current temperature T of the liquid cooling medium x ; When T x ≤T setn When (1+k), the pump maintains the first speed; When T x >T setn When (1+k), the cooling module starts.

8. The control method of the cooling system according to claim 4, characterized in that: The control method comprises: Introduce the warning temperature T of the target to be cooled bat0 , and T bat0 >T bat1 ; When T bat ≥T bat0 When the cooling module is turned on, it operates at maximum power.

9. The method for controlling a cooling system according to any one of claims 1 to 8, characterized in that: The detection position of the liquid cooling medium in detecting the temperature and the temperature rise rate of the liquid cooling medium is the outlet of the target to be cooled.

10. A cooling device, characterized in that: The cooling device operates according to the control method of the cooling system according to any one of claims 1 to 9.

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