A control method of a cooling system and a cooling device

Abstract

The application provides a control method of a cooling system and a cooling device, the cooling system is used for cooling a target to be cooled, and the cooling system comprises a cooling module, a pump and a liquid cooling medium in circulation. The control method comprises the following steps: detecting a temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time and comparing the temperature rise rate with a set reference rate (△T w / t) set ; when (△T w / t) ct >(△T w / t) set , the cooling system enters an early pre-cooling working mode, and the cooling module is started to reduce the temperature of the liquid cooling medium in advance; and when (△T w / t) ct ≤(△T w / t) set , the cooling system enters a normal working mode. The application can predict the heat dissipation demand of the target to be cooled through the temperature rise rate of the liquid cooling medium, realize 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 achieve the purpose of quickly responding to the heat dissipation demand of the target to be cooled, thereby enhancing the stability of the operation of the target to be cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration control, in particular to a control method of a cooling system and a cooling device. BACKGROUND

[0002] In recent years, the application of liquid-cooled battery energy storage systems is more and more, the battery energy storage system includes battery cells and liquid cooling units for cooling the battery cells, which is different from the traditional heat source. The heat conduction of the battery cells has a time lag, which causes the temperature rise speed of the battery cells to be much higher than the temperature rise speed of the refrigerant of the liquid cooling unit. In the process of implementing the present application, the inventors found that at least the following problems exist in the prior art:

[0003] On the one hand, the existing liquid cooling unit takes 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 cells. The water temperature is set low and the high temperature difference between the water temperature and the battery cells is maintained to enhance the heat dissipation effect. However, this control method will cause the unit to maintain a high energy consumption operating state for a long time, resulting in serious energy loss and poor unit operating efficiency, and is not energy-saving. On the other hand, the liquid cooling unit does not pre-cool before the battery is charged and discharged, which causes the liquid cooling unit to be unable to quickly respond to the heat dissipation demand of the battery cells, and the liquid cooling unit is unable to follow the temperature rise speed of the battery cells during charging and discharging, and is unable to effectively dissipate heat for the battery cells. SUMMARY

[0004] Therefore, the present application provides a control method of a cooling system and a cooling device to effectively solve the problem that the existing liquid cooling unit cannot quickly respond to the heat dissipation demand of the battery cells.

[0005] The present application provides a control method of a cooling system, the cooling system is used for cooling 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 for heat exchange with the liquid cooling medium, and the pump is used for driving the liquid cooling medium to circulate, and the control method includes:

[0006] When the cooling module is in standby state and the pump is started, the temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time is detected, and compared with a set reference rate (△T w / t) set .

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

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

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

[0010] when T batn1 < T bat < T batn2 , setting the temperature of the liquid cooling medium as T setn2 ;

[0011] when T bat = T batn1 , setting the temperature of the liquid cooling medium as T setn1 ;

[0012] when T bat = T batn2 , the temperature of the liquid cooling medium is maintained as T setn2 ;

[0013] wherein n is an integer greater than or equal to 2, 1 < n1≤ n, 1≤ n2< n, n1> n2, and n1and n2are adjacent integers.

[0014] In an embodiment, the n temperature levels set for the liquid cooling medium are respectively attached with demand coefficients, and the demand coefficient is 1+k, wherein the value range of k is 0%~10%.

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

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

[0017] when the temperature of the liquid cooling medium is set as T setn3(1+k), detecting a current temperature T of the liquid cooling medium x ;

[0018] When T x ≤ T setn3 (1+k), the pump is maintained to operate at the first rotating speed;

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

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

[0021] In an embodiment, the control method comprises:

[0022] Introducing a minimum critical temperature T baty of the target to be cooled, and T baty <T batn ;

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

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

[0025] In an embodiment, the control method comprises:

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

[0027] When T x ≤ T setn (1+k), the pump is maintained to operate at the first rotating speed;

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

[0029] In an embodiment, the control method comprises:

[0030] Introducing a pre-warning temperature T bat0 of the target to be cooled, and T bat0 >T bat1 ;

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

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

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

[0034] In summary, the application provides a control method of a cooling system and a cooling device, the cooling system being used for cooling a target to be cooled, the cooling system comprising 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 being used for heat exchange with the liquid cooling medium to cool and lower the temperature of the liquid cooling medium, and the pump being used for driving the liquid cooling medium to circulate, the control method comprising: when the cooling module is in a standby state and the pump is started, detecting the temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time and comparing it with a set reference rate (△T w / t) set ; when (△T w / t) ct > (△T w / t) set , the cooling system enters an early pre-cooling working mode, and the cooling module is turned on to lower the temperature of the liquid cooling medium in advance; and when (△T w / t) ct ≤ (△T w / t) set , the cooling system enters a normal working mode. The application predicts the heat dissipation demand of the target to be cooled through the temperature rise rate of the liquid cooling medium, so as to realize early pre-cooling of the temperature of the target to be cooled, quickly follow the temperature rise speed 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 and enhancing the stability of the operation of the target to be cooled. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a flowchart of the control method of the cooling system of the application.

[0036] Figure 2 It is a schematic diagram of the principle of the cooling system of the application.

[0037] Figure 3 It is a schematic diagram of the principle of the cooling module of the 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 - pipe; 26 - liquid cooling medium inlet; 28 - liquid cooling medium outlet; 30 - condenser; 32 - evaporator; 34 - throttle valve; 36 - liquid storage tank; 38 - pipe. DETAILED DESCRIPTION

[0040] Before the embodiments are described in detail, it should be understood that the application is not limited to the detailed structure or arrangement of elements described hereinafter or illustrated in the drawings. The application can be implemented in other ways. Moreover, it should be understood that the language and terminology used herein are for the purpose of description and not of limitation. As used herein, the terms "comprise", "comprise", "have" and the like are intended to encompass the items listed thereafter, their equivalents, and additional items. In particular, when describing "one certain element", the application does not limit the number of the element to one, but can include multiple.

[0041] Referring to Figure 1 The application provides a control method of a cooling system 10 for cooling a target to be cooled, such as a battery energy storage system 12, specifically 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 for heat exchange 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 standby state and the pump 22 is started, detecting the temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time and comparing it with a set reference rate (△T w / t) set When (△T w / t) ct >(△T w / t) set , the cooling system 10 enters an early pre-cooling working mode, and the cooling module 18 is turned on to reduce the temperature of the liquid cooling medium in advance; when (△T w / t) ct ≤(△T w / t) setWhen the cooling system 10 enters the normal working mode. That is, when the cooling module 18 is in the on state to refrigerate the liquid cooling medium, the system does not detect the temperature rise rate of the liquid cooling medium, and 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 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 realize the pre-cooling 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, enhance the stability and reliability of the operation of the target to be cooled, and ensure that the target to be cooled is in a safe and reasonable temperature range.

[0042] In this embodiment, please refer to Figure 2 As shown in the figure, the cooling system 10 cools and cools the battery energy storage system 12 by liquid cooling heat exchange. Specifically, the cooling system 10 includes the battery energy storage system 12, the cooling module 18, the liquid reservoir 20, the pump 22, and the pipeline 24 connecting the above-mentioned devices. The liquid cooling medium circulates between the devices along the pipeline 24. The liquid cooling medium can be water, coolant or antifreeze, etc. The flow direction is indicated 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 temperature and temperature rise rate is the outlet of the target to be cooled, that 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 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. 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 pre-set lower temperature by heat exchange with the liquid cooling medium. The liquid cooling medium enters the battery energy storage system 12 from the liquid cooling medium inlet 26 after being cooled to the pre-set temperature. The liquid cooling medium absorbs the heat generated by the battery cell 14 during the flow process, and 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 for cooling and cooling. In this way, the battery energy storage system 12 is cooled by the liquid cooling medium.

[0043] Further, please refer to Figure 3As shown, the cooling module 18 can be a conventional refrigeration mechanism, for example, the cooling module 18 includes a compressor 16, a condenser 30, an evaporator 32, a throttle valve 34, a liquid tank 36, and pipes 38 connecting the above-mentioned devices, and a refrigerant circulates between the devices along the pipes 38 in the direction indicated by the arrows in the figure, absorbs heat to evaporate or releases heat to condense, and realizes refrigeration. Specifically, the compressor 16 includes a suction port and a discharge port, wherein the suction port is connected to the outlet of the evaporator 32, and the discharge port is connected to the inlet of the condenser 30. The low-temperature and low-pressure refrigerant vapor formed by the evaporator 32 absorbs heat to evaporate, and in the process of flowing through the compressor 16, the compressor 16 converts it into high-temperature and high-pressure refrigerant gas by doing work, and delivers it to the condenser 30 to condense. The inlet of the condenser 30 is connected to the compressor 16, and the outlet is connected to the inlet of the liquid 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 medium-temperature and medium-pressure liquid refrigerant, and delivering it to the liquid tank 36 through the outlet of the condenser 30. The liquid tank 36 is used to store refrigerant that does not enter the circulation, and the inlet is connected to the condenser 30, and the outlet is connected to the inlet of the throttle valve 34. The inlet of the throttle valve 34 is connected to the liquid 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 it, and the medium-temperature and medium-pressure liquid refrigerant becomes low-temperature and low-pressure liquid refrigerant after the throttling effect of the throttle valve 34. The start of the cooling module 18 in the present application can also be considered as the start of the compressor 16.

[0044] Preferably, the cooling system 10 further includes a control module, and the compressor 16 and the pump 22 are respectively connected to the control module, and the control module can control the start / stop and parameter adjustment 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 a plurality of temperature detectors, and the plurality of temperature detectors can be used to detect the real-time temperature of the battery cell and the liquid cooling medium.

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

[0046] n temperature levels are set for the battery cell 14, respectively T bat1 , …, T bat(n-1) , T batn , and T bat1 > … > T bat(n-1) > T batn , and correspondingly, n temperature levels are set for the liquid cooling medium, respectively T set1 , …, T set(n-1) , T setn , and T set1 < … < T set(n-1) < T setn, the n temperature grades of the battery cell 14 and the n temperature grades of the liquid cooling medium are one-to-one corresponding according to the index number; the control method comprises:

[0047] detecting the current temperature T of the battery cell 14 bat and comparing with the set temperature of the battery cell 14;

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

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

[0050] when T bat =T batn2 , the temperature of the liquid cooling medium is maintained to T setn2 ;

[0051] wherein n is an integer greater than or equal to 2, 1 set1 <n, 1 set(n-1) ≤n2 setn <n, n1 setn3 >n2, and n1 and n2 are adjacent integers. By setting multiple grades for the battery cell temperature and setting the target liquid cooling medium temperature control corresponding to the gradient, the battery cell temperature can be controlled in a safe and reasonable range, and the target liquid cooling medium temperature is not too low to cause excessive running power consumption of the cooling system, achieving the purpose of energy saving and meeting the battery cell heat dissipation. Moreover, the system adjusts the target temperature of the liquid cooling medium according to the battery cell temperature, reasonably adds or reduces the load, so that the cooling system 10 runs in an energy-saving state, improving energy efficiency.

[0052] After the cooling system 10 starts, the pump 22 runs at a first speed;

[0053] Preferably, the n temperature grades set for the liquid cooling medium are respectively attached with a demand coefficient, the demand coefficient is 1+k, wherein the value range of k is 0%~10%, and the n temperature grades set for the liquid cooling medium are respectively: T set1 (1+k), …, T set(n-1) (1+k), T setn (1+k). If no demand coefficient is attached, the cooling module 18 will stop when the temperature of the liquid cooling medium decreases after the system starts, and the cooling module 18 will start to cool again when the temperature of the liquid cooling medium rises after stopping, which causes the problem of frequent start and stop of the cooling module 18. By attaching the demand coefficient to the temperature grade of the liquid cooling medium, the present application can effectively prevent the frequent start and stop of the cooling module 18.

[0054] when the temperature of the liquid cooling medium is set to T setn3 (1+k), detecting the current temperature Tx ;

[0055] When T x ≤ T setn3 (1+k), the pump 22 maintains the first rotating speed, at this time, the temperature of the liquid cooling medium is lower than the corresponding set value, and the temperature of the liquid cooling medium does not need to be reduced by increasing the flow speed of the liquid cooling medium;

[0056] When T x >T setn3 (1+k), the pump 22 operates at the second rotating speed, and the compressor 16 is started, the second rotating speed is greater than the first rotating speed, at this time, the temperature of the liquid cooling medium is higher than the corresponding set value, and the temperature of the liquid cooling medium needs to be reduced by increasing the flow speed of the liquid cooling medium and by means of the compressor 16 to achieve the heat dissipation demand of the electric core 14;

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

[0058] Further, the lowest critical temperature T baty of the electric core 14 is introduced, and T baty <T batn ;

[0059] When T bat <T baty , it indicates that the current electric core temperature is lower than the set lowest critical temperature, the system does not need to be pre-cooled, and the compressor 16 is stopped;

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

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

[0062] When T x ≤ T setn (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 rotating speed;

[0063] When T x >T setn (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] Further, the pre-warning temperature T bat0 of the electric core 14 is introduced, and T bat0 >T bat1; by increasing the maximum pre-warning temperature T bat0 of the battery energy storage system 12 to warn of an impending thermal runaway, at which point the cooling system 10 releases the maximum refrigeration capacity, shortens the time to increase the cooling capacity, and strives for more processing time before thermal runaway occurs, thereby achieving the purpose of improving reliability.

[0065] When T bat ≥ T bat0 , it indicates that the temperature of the battery energy storage system 12 is too high, and an impending thermal runaway is about to occur. The cooling system 10 releases the maximum power of the cooling module 18, and the compressor 16 operates at the maximum speed, thereby shortening the time to increase the refrigeration capacity of the cooling module 18, achieving rapid cooling, striving for more processing time before thermal runaway occurs, greatly reducing the incidence of thermal runaway, and reducing losses.

[0066] Preferably, the temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time is detected, wherein the unit time is 4-6 minutes, and preferably 5 minutes.

[0067] In some embodiments, the battery cell temperature can be distinguished according to the temperature characteristics (service life) of the battery cell in use, for example, five temperature levels are set, which are T bat1 , T bat2 , T bat3 , T bat4 , and T bat5 , i.e. n=5, and 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 at different battery cell temperatures, the temperature control targets of the liquid cooling medium in the cooling system 10 are also divided into five levels, which are T set1 , T set2 , T set3 , T set4 , and T set5 , and their sizes are T set1 <T set2 <T set3 <T set4 <T set5 . For example, the five temperature control targets of the liquid cooling medium can be respectively attached with demand coefficients, which are T set1 (1+k), T set2 (1+k), T set3 (1+k), T set4 (1+k), and T set5 .(1+k). By setting the target liquid cooling medium temperature control according to the battery cell temperature gradient, 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 the operation power consumption of the cooling module 18 to be too large, achieving the purpose of energy saving and meeting the heat dissipation of the battery cell 14.

[0068] For example, after the battery energy storage system 12 is started, the cooling system 10 receives a start-up command and starts, and the pump 22 operates at a first speed. At this time, the current battery cell temperature received by the cooling system 10 is T bat , the system judges that T bat is between T bat4 and T bat5 , and sets the target temperature of the liquid cooling medium to T set4 (1+k). The detected current liquid cooling medium temperature T x of the system is compared with T set4 (1+k), if T x is less than T set4 (1+k), the pump 22 maintains the current first speed, if T x is greater than T set4 (1+k), the pump 22 is replaced by operating at a second speed, and the compressor 16 is started.

[0069] During operation, if the battery cell temperature T bat rises 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 is lowered, and the compressor 16 is loaded; if the battery cell temperature T bat falls 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 is increased, and the compressor 16 is unloaded; if the battery cell temperature T bat4 is maintained, the cooling system will maintain the current target temperature setting of the liquid cooling medium and continue to operate.

[0070] When the system judges that T bat is less than T bat5 , the target temperature control of the liquid cooling medium is set to T set5 (1+k) at this time, if T x is greater than T set5 (1+k) at this time, the compressor 16 is normally started. If T x is less than T set5 (1+k), the pump 22 maintains the first speed; but if the system calculates the change rate (△T x / t) w of T ct in 5 minutes w / t) set , indicating that the battery cell temperature rises rapidly, the heat dissipation demand increases, and early pre-cooling is needed to respond, at this time the system enters the early pre-cooling working mode, and the compressor 16 is started to reduce the temperature of the liquid cooling medium in advance, realizing the early pre-cooling of the battery cell temperature to quickly respond to the heat dissipation demand of the battery cell 14; if T bat continues to drop, when T bat <T baty , the compressor 16 stops; if T bat continues to rise, T bat >T bat5 , the related control logic of the above normal working mode is run.

[0071] When T bat continues to rise to T bat0 (preparation for thermal runaway), the cooling system 10 releases the upper limit speed of the compressor 16, so that the compressor 16 can run at the maximum speed, and the refrigerating capacity of the cooling module 18 is increased in a short time to realize rapid cooling and strive for more processing time before thermal runaway occurs, greatly reducing the occurrence rate of thermal runaway and reducing losses.

[0072] The application also provides a cooling device, which comprises the above cooling system 10 and can operate according to the above control method.

[0073] In summary, the application provides a control method of a cooling system and a cooling device, the cooling system is used for cooling a target to be cooled, and 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 for heat exchange with the liquid cooling medium to cool and lower the temperature of the liquid cooling medium, and the pump is used for driving the liquid cooling medium to circulate, the control method comprises: when the cooling module is in a standby state and the pump is started, detecting the temperature rise rate (△T w / t) ct of the liquid cooling medium per unit time and comparing it with a set reference rate (△T w / t) set ; when (△T w / t) ct >(△T w / t) set , the cooling system enters an early pre-cooling working mode, and the cooling module is started to reduce the temperature of the liquid cooling medium in advance; when (△T w / t) ct ≤(△T w / t) setWhen the temperature of the liquid cooling medium reaches a preset temperature, the cooling system enters a normal working mode. The application predicts the heat dissipation requirement of the target to be cooled through the temperature rising rate of the liquid cooling medium, so as to realize the pre-cooling of the target to be cooled, quickly follow the temperature rising speed of the target to be cooled, and achieve the purpose of quickly responding to the heat dissipation requirement of the target to be cooled, and enhance the stability of the target to be cooled.

[0074] The concepts described herein can be embodied in other forms without departing from the spirit and nature of the subject matter set forth herein. The specific embodiments disclosed are to be considered as illustrative and not restrictive. The scope of the application is therefore determined by the appended claims, rather than by the foregoing description. Any alterations and further modifications in the described embodiments are to be construed as being within the scope of the present application.

Claims

1. A control method for a cooling system, characterized in that, The cooling system is used to cool 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, and 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) of the liquid cooling medium per unit time is detected. w / t) ct and compared with the set reference rate (ΔT) w / t) set Compare; When (△T) w / t) ct > (△T) w / t) set At that time, the cooling module is turned on to lower the temperature of the liquid cooling medium in advance; When (△T) w / t) ct ≤(△T w / t) set When the cooling system enters normal operating mode, the normal operating mode includes: setting n temperature levels for the target to be cooled, namely T bat1 ... T bat（n-1） T batn And T bat1 > ... > T bat（n-1） >T batn The liquid cooling medium is set with n temperature levels, namely T set1 ... T set（n-1） T setn And T set1 <...<T set（n-1） <T setn The control method includes: Detect the current temperature T of the target to be cooled. bat And compare it with the set temperature of the target to be cooled; When T batn1 <T bat <T batn2 At that time, the temperature of the liquid cooling medium is set to T. setn2 ; When T bat =T batn1 At that time, the temperature of the liquid cooling medium is set to T. setn1 ; When T bat =T batn2 At that time, the temperature of the liquid cooling medium is maintained at T. setn2 ; Where n is an integer greater than or equal to 2, 1 < n1 ≤ n, 1 ≤ n2 < n, n1 > n2, and n1 and n2 are consecutive integers; A demand coefficient is added to each of the n temperature settings of the liquid cooling medium. The demand coefficient is 1+k, where the value of k ranges from 0% to 10%.

2. The control method for the cooling system as described in claim 1, characterized in that, The control method includes: after the cooling system is started, the pump operates at a first speed.

3. The control method for the cooling system as described in claim 2, characterized in that, The control method includes: When the temperature of the liquid cooling medium is set to T setn3 When (1+k), the current temperature T of the liquid cooling medium is detected. x ; When T x ≤T setn3 When (1+k), the pump maintains the first speed. When T x >T setn3 When (1+k), the pump operates at a second speed, the cooling module is started, and the second speed is greater than the first speed; Where 1≤n3≤n, and n3 is an integer.

4. The control method for the cooling system as described in claim 2, characterized in that, The control method includes: The minimum critical temperature T of the target to be cooled is introduced. baty And T baty <T batn ; When T bat <T baty When this occurs, the cooling module stops operating; When T bat >T batn At that time, the cooling system enters the normal operating mode.

5. The control method for the cooling system as described in claim 4, characterized in that, The control method includes: When T baty ≤T bat <T batn At that time, 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 is activated.

6. The control method for the cooling system as described in claim 2, characterized in that, The control method includes: Introducing the warning temperature T of the target to be cooled bat0 And T bat0 >T bat1 ; When T bat ≥T bat0 At that time, the cooling module operates at maximum power.

7. The control method for the cooling system as described in any one of claims 1-6, characterized in that, The detection location for the liquid cooling medium, which measures the temperature and temperature rise rate of the liquid cooling medium, is the outlet of the target to be cooled.

8. A cooling device, characterized in that, The cooling device is operated according to the control method of the cooling system as described in any one of claims 1-7.

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