Liquid cooling system, battery swap station and liquid cooling control method

Abstract

The invention provides a liquid cooling system, a battery swap station and a liquid cooling control method. The liquid cooling system comprises a liquid cooling unit, a water outlet pipe assembly, a water return pipe assembly, a plurality of branch valves, a plurality of detection devices and a control device. The water outlet pipe assembly comprises a water outlet main pipe fitting and a plurality of water outlet branch pipe fittings. The water outlet main pipe fitting is connected to the liquid cooling unit and the water outlet branch pipe fitting suitable for being connected with the battery pack. The water return pipe assembly comprises a water return main pipe fitting and a plurality of water return branch pipe fittings. The water return main pipe fitting is connected to the liquid cooling unit and the water return branch pipe fitting suitable for being connected with the battery pack. And the branch valves are respectively arranged on the water outlet branch pipe fittings. The detection device is configured to send an in-place signal to the control device when the battery pack is in place. The control device is configured to control the corresponding branch valves to be switched between the opening state and the closing state according to whether the in-place signals are received or not. The opening and closing states of the corresponding branch valves are controlled according to the in-place condition of the battery pack, and the function of automatically controlling liquid cooling is achieved.

Description

Technical Field

[0001] The present application generally relates to the technical field of battery swap stations, and more specifically to a liquid cooling system, a battery swap station, and a liquid cooling control method. Background Art

[0002] Most of the liquid cooling systems in related technologies are used in energy storage power stations. The liquid cooling system includes a liquid replenishment unit, a liquid distribution control box, a flow valve body, a temperature monitor, a flow monitor and other components. The liquid cooling system is linked to the battery-side BMS system to obtain data such as the temperature of the battery pack itself to regulate the coolant. However, the structure of this liquid cooling system is relatively complex, and the temperature control process is relatively cumbersome, which will affect the battery replacement rhythm.

[0003] Therefore, it is necessary to provide a liquid cooling system, a battery swap station and a liquid cooling control method to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above-mentioned problems, the first aspect of the present application provides a liquid cooling system for use in a battery swap station, the liquid cooling system comprising a liquid cooling unit, a water outlet pipe assembly, a water return pipe assembly, a plurality of branch valves, a plurality of detection devices and a control device, the water outlet pipe assembly comprising a water outlet main pipe member and a plurality of water outlet branch pipe members, one end of the water outlet main pipe member is connected to the water outlet of the liquid cooling unit, one end of the water outlet branch pipe member is connected to an end of the water outlet main pipe member away from the liquid cooling unit, and the other end of the water outlet branch pipe member is suitable for connecting to a battery pack, the return pipe assembly comprises a return water main pipe member and a plurality of return water branch pipe members, one end of the return water main pipe member is connected to the water outlet of the liquid cooling unit A return water inlet, one end of the return water branch pipe is connected to an end of the return water main pipe away from the liquid cooling unit, and the other end of the return water branch pipe is suitable for connecting to a battery pack, each of the branch valves is respectively arranged on each of the outlet water branch pipes, and each of the detection devices is respectively used to detect the presence of each battery pack, the control device is electrically connected to the detection device and the branch valve, the detection device is configured to send a presence signal to the control device when the battery pack is in place, and the control device is configured to control the branch valve on the outlet water branch pipe connected to the corresponding battery pack to switch between an open state and a closed state according to whether the presence signal is received.

[0006] Optionally, the liquid cooling system further includes a bypass pipe fitting and a bypass valve, wherein two ends of the bypass pipe fitting are respectively connected to the water outlet main pipe fitting and the water return main pipe fitting, and the bypass valve is arranged on the bypass pipe fitting. The control device is also electrically connected to the bypass valve, and the control device is further configured to control the bypass valve to switch between an open state and a closed state and / or control the bypass valve to change its opening degree according to the number of the detection devices that send the in-place signal.

[0007] Optionally, the liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The control device is further configured to control the rotation speed of the water pump according to the number of the detection devices that send the presence signal, or to control the rotation speed of the water pump according to the duty cycle of the water pump.

[0008] Optionally, the detection device is a travel switch or a position sensor.

[0009] A second aspect of the present application provides a battery swap station, the battery swap station comprising at least one battery rack and the above-mentioned liquid cooling system; The battery rack includes multiple charging layers, and the charging layers are suitable for placing the battery pack and charging the battery pack; Each of the detection devices is respectively arranged at each of the charging layers to detect whether each battery pack is located at the charging layer.

[0010] The third aspect of the present application provides a liquid cooling control method, which is applied to the above-mentioned battery swap station, and the liquid cooling control method includes: When any of the detection devices detects that a battery pack is in place, the detection device sends a presence signal to the control device, and the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to an open state; When any detection device detects that the battery pack is not in place, the detection device does not send a presence signal to the control device, and the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to a closed state.

[0011] Optionally, the liquid cooling system also includes a bypass pipe fitting and a bypass valve, the two ends of the bypass pipe fitting are respectively connected to the water outlet main fitting and the water return main fitting, and the bypass valve is arranged on the bypass pipe fitting. The liquid cooling control method also includes: when a≥c, the control device controls the bypass valve to switch to a closed state, and when a<c, the control device controls the bypass valve to switch to an open state, wherein a is the quantity value of the detection device that sends the in-place signal, and c is a preset value; or, according to the change of the quantity value a of the detection device that sends the in-place signal, the control device controls the bypass valve to change its opening, and the opening of the bypass valve is negatively correlated with the quantity value a.

[0012] Optionally, the liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The liquid cooling control method further includes: According to the change of the quantity value a of the detection device that sends the in-place signal, the control device controls the rotation speed of the water pump, and the rotation speed of the water pump is positively correlated with the quantity value a.

[0013] Optionally, the liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The liquid cooling control method further includes: The control device receives a PWM signal of the water pump and determines a duty cycle b of the water pump according to the PWM signal; According to the change of the duty cycle b, the control device controls the rotation speed of the water pump, and the rotation speed of the water pump is at least partially positively correlated with the duty cycle b.

[0014] Optionally, when 0%≤b<10%, the control device controls the speed of the water pump to 0; When 10%≤b<50%, the control device controls the speed of the water pump to be v1; When 50%≤b<90%, the control device controls the speed of the water pump to be v2; When 90%≤b≤100%, the control device controls the speed of the water pump to be v3; Wherein, v1<v2<v3, v1 is a fixed value, v3 is a fixed value and is the maximum value of the rotation speed of the water pump; v2 is a changing value, and v2 is linearly positively correlated with the duty cycle b.

[0015] Beneficial Effects (1) According to the liquid cooling system of the first aspect of the present application, the liquid cooling unit supplies coolant to the battery pack through the water outlet pipe assembly, and recovers coolant from the battery pack through the water return pipe assembly. When the detection device detects that the battery pack is in place, the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to an open state. When the detection device detects that the battery pack is not in place, the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to a closed state. Thus, the opening and closing states of the branch valves of the corresponding water outlet pipes can be controlled according to the presence of the battery pack. By adopting the above-mentioned technical means, the function of automatic control of liquid cooling can be realized without the linkage of the battery-end BMS system and station control communication, while simplifying the system structure and reducing costs.

[0016] (2) The liquid cooling system according to the first aspect of the present application can also control the bypass valve to switch between an open state and a closed state and / or control the bypass valve to change its opening according to the number of battery packs in place, so as to balance the pressure of the water outlet main pipe when providing coolant to battery packs with different numbers of battery packs in place.

[0017] (3) According to the liquid cooling system of the first aspect of the present application, the rotation speed of the water pump can also be controlled according to the number of battery packs in place.

[0018] (4) According to the liquid cooling system of the first aspect of the present application, the rotation speed of the water pump can also be controlled according to the duty cycle of the water pump.

[0019] (5) According to the battery swap station of the second aspect of the present application, by applying the above-mentioned liquid cooling system, the opening and closing state of the branch valve of the corresponding water outlet pipe can be controlled according to whether the battery pack is located in the charging layer, thereby realizing automatic control of the liquid cooling system. Moreover, the system structure of the battery swap station can be simplified and the cost can be reduced.

[0020] (6) According to the liquid cooling control method of the third aspect of the present application, the opening and closing state of the branch valve of the corresponding water outlet pipe can be controlled according to whether the battery pack is in place, thereby realizing automatic control of the liquid cooling system. The liquid cooling control method simplifies the control logic, which is conducive to improving the efficiency and stability of program control, and further helps to improve the efficiency of cooling the battery pack and reduce the cost.

[0021] (7) According to the liquid cooling control method of the third aspect of the present application, the bypass valve can also be automatically opened or closed or the opening degree of the bypass valve can be automatically controlled according to the number of battery packs in place, so as to achieve the purpose of balancing the pressure of the water outlet main pipe when providing coolant to different numbers of battery packs, thereby protecting the water outlet main pipe.

[0022] (8) According to the liquid cooling control method of the third aspect of the present application, the rotation speed of the water pump can also be controlled according to the duty cycle of the water pump, which helps to more accurately control the rotation speed of the water pump and balance the pressure of the water outlet main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings of the embodiments of the present application are used as a part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, which are used to explain the principle of the present application.

[0024] Figure 1 is a principle block diagram of a liquid cooling system according to a preferred embodiment of the present application; Figure 2 A three-dimensional view of a liquid cooling system not including a liquid cooling unit according to a preferred embodiment of the present application; Figure 3 A three-dimensional view of a liquid cooling system according to a preferred embodiment of the present application when applied to a pair of battery racks; Figure 4 This is a connection diagram of a control device, a detection device, a liquid cooling unit, a relay, a first branch valve and a power supply in a liquid cooling system according to a preferred embodiment of the present application.

[0025] Description of reference numerals: 100: First liquid cooling unit 101: Liquid pump device 102: Water pump 103: Cold source device 104: compressor 105: heat exchanger 106: first water outlet pipe assembly 107: first water outlet main pipe assembly 108: First water outlet branch pipe 109: First water return pipe assembly 111: First water return main pipe 112: First water return branch pipe 113: First branch valve 114: First bypass pipe fitting 115: First bypass valve 120: Control device 130: Second liquid cooling unit 131: Second water outlet pipe assembly 132: Second water outlet main pipe 133: Second water outlet branch pipe 134: Second water return pipe assembly 135: Second water return main pipe assembly 136: Second water return branch pipe 137: Second branch valve 138: Second bypass pipe fitting 139: Second bypass valve 150: First battery rack 151: Cache layer 152: first charging layer 153: detection device 160: Second battery rack 161: Second charging layer 170: Battery pack 181: Relay 182: Power supply D1: Length direction D2: Width direction D3: Height direction DETAILED DESCRIPTION

[0026] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0027] In order to fully understand the implementation of the present application, a detailed structure will be presented in the following description. Obviously, the implementation of the implementation of the present application is not limited to the specific details familiar to those skilled in the art.

[0028] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present application, and the singular forms "a", "an" and "said" / "the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof.

[0029] Ordinal numbers such as "first" and "second" cited in this application are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and similar expressions used in this application are for illustrative purposes only and are not limiting.

[0030] Terms like "center," "parallel," "perpendicular," "aligned," "symmetrical," etc., as used in this application do not necessarily require precision but may include typical engineering tolerances.

[0031] Hereinafter, specific embodiments of the present application will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present application and do not limit the present application.

[0032] See also Figures 1 to 4, an embodiment of the present application provides a liquid cooling system. The liquid cooling system is used in a battery swap station. The liquid cooling system includes a liquid cooling unit, a water outlet pipe assembly, a return pipe assembly, a plurality of branch valves, a plurality of detection devices 153 and a control device 120. The water outlet pipe assembly includes a water outlet main pipe and a plurality of water outlet branch pipes. One end of the water outlet main pipe is connected to the water outlet of the liquid cooling unit. One end of the water outlet branch pipe is connected to an end of the water outlet main pipe away from the liquid cooling unit. The other end of the water outlet branch pipe is suitable for connecting to a battery pack 170. The return pipe assembly includes a return water main pipe and a plurality of return water branch pipes. One end of the return water main pipe is connected to the return water outlet of the liquid cooling unit. One end of the return water branch pipe is connected to an end of the return water main pipe away from the liquid cooling unit. The other end of the return water branch pipe is suitable for connecting to a battery pack 170. Each branch valve is respectively arranged on each water outlet branch pipe. Each detection device 153 is used to detect the presence of each battery pack 170. The control device 120 is electrically connected to the detection device 153 and the branch valve. The detection device 153 is configured to send a presence signal to the control device 120 when the battery pack 170 is in place. The control device 120 is configured to control the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch between an open state and a closed state according to whether the presence signal is received.

[0033] It can be understood that the service object of the liquid cooling system in this embodiment is the battery pack 170 in the battery swap station. There is a structure for storing the battery pack 170 in the battery swap station. The structure for storing the battery pack 170 is usually a battery rack, and the battery rack has a charging layer for placing the battery pack and charging the battery pack. The above-mentioned "the presence of the battery pack 170" refers to the position of the battery pack 170 with respect to the battery rack (charging layer). Specifically, when the battery pack 170 is in the charging layer of the battery rack and the detection device 153 is triggered, it indicates that the battery pack 170 is in place, and when the battery pack 170 is out of the charging layer of the battery rack and the detection device 153 is not triggered, it indicates that the battery pack 170 is not in place.

[0034] According to the liquid cooling system of this embodiment, the liquid cooling unit supplies coolant to the battery pack 170 through the water outlet pipe assembly, and recovers coolant from the battery pack 170 through the water return pipe assembly. When the detection device 153 detects that the battery pack 170 is in place, the control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to an open state so that the coolant flows to the battery pack 170. When the detection device 153 detects that the battery pack 170 is not in place, the control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state to prevent the coolant from flowing to the battery pack 170. Thus, the opening and closing state of the branch valve of the corresponding water outlet pipe can be controlled according to the presence of the battery pack 170. By adopting the above-mentioned technical means, the function of automatic control of liquid cooling can be realized without the linkage of the battery-end BMS system and the station control communication, and there is no need to obtain the temperature data of the battery pack 170, while simplifying the design and structure of the system and reducing costs.

[0035] See also Figures 1 to 3 In addition, the liquid cooling system also includes a bypass pipe fitting and a bypass valve. The two ends of the bypass pipe fitting are respectively connected to the water outlet main fitting and the water return main fitting. The bypass valve is arranged on the bypass pipe fitting. The control device 120 is also electrically connected to the bypass valve. The control device 120 is also configured to control the bypass valve to switch between an open state and a closed state and / or control the bypass valve to change its opening according to the number of detection devices 153 that send in-place signals. The number of detection devices 153 that send in-place signals can be used to characterize the number of battery packs 170 in place. The embodiments of the present application can control the bypass valve to switch between an open state and a closed state and / or control the bypass valve to change its opening according to the number of battery packs 170 in place, so as to balance the pressure of the water outlet main fitting when providing coolant to different numbers of battery packs 170.

[0036] See also Figure 1 and Figure 4 In some embodiments, the liquid cooling unit includes a water pump 102. The control device 120 is also electrically connected to the water pump 102. The control device 120 is also configured to control the speed of the water pump 102 according to the number of detection devices 153 that send in-place signals. According to this embodiment, the speed of the water pump 102 can be controlled according to the number of battery packs 170 in place.

[0037] See also Figure 1 and Figure 4 In other embodiments, the liquid cooling unit includes a water pump 102. The control device 120 is also electrically connected to the water pump 102. The control device 120 is also configured to control the speed of the water pump 102 according to the duty cycle of the water pump 102. According to this embodiment, the speed of the water pump 102 can be controlled according to the duty cycle of the water pump 102.

[0038] The embodiment of the present application also provides a battery swap station. The battery swap station includes at least one battery rack and the above-mentioned liquid cooling system. The battery rack includes multiple charging layers. The charging layer is suitable for placing the battery pack 170 and charging the battery pack 170. Each detection device 153 is respectively arranged at each charging layer to detect whether each battery pack 170 is located at the charging layer.

[0039] According to the battery swap station of the embodiment of the present application, by applying the above-mentioned liquid cooling system, the opening and closing states of the branch valves of the corresponding water outlet pipes can be controlled according to whether each battery pack 170 is located at each charging layer, thereby realizing automatic control of the liquid cooling system. Moreover, the system structure of the battery swap station can be simplified and the cost can be reduced.

[0040] See also Figure 3 , the battery swap station includes two battery racks. The length direction D1, width direction D2, and height direction D3 of the two battery racks are respectively consistent. The two battery racks are arranged oppositely along the length direction D1. The two battery racks include a first battery rack 150 and a second battery rack 160. The first battery rack 150 includes a cache layer 151 and a first charging layer 152. When the number of cache layers 151 is two or more, each cache layer 151 is arranged at intervals in the height direction D3. Each cache layer 151 is suitable for placing a battery pack 170. The battery pack 170 stored in any cache layer 151 can be a battery pack 170 in a depleted state transferred by a battery swap robot, or it can be a charged battery pack 170 transferred from the first charging layer 152 by a palletizer. The first charging layer 152 is located above the cache layer 151. When the number of first charging layers 152 is two or more, each first charging layer 152 is arranged at intervals in the height direction D3. Each first charging layer 152 is suitable for placing a battery pack 170. The second battery rack 160 includes a second charging layer 161. When the number of second charging layers 161 is two or more, the second charging layers 161 are arranged at intervals in the height direction D3. Each second charging layer 161 is suitable for placing a battery pack 170. Each first charging layer 152 is respectively provided with a detection device 153 to detect whether each battery pack 170 is located in the first charging layer 152. Each second charging layer 161 is respectively provided with a detection device 153 to detect whether each battery pack 170 is located in the second charging layer 161.

[0041] See below Figure 2 and Figure 3 The liquid cooling system of some embodiments of the present application is further described.

[0042] See also Figure 2 and Figure 3The liquid cooling system includes two groups of liquid cooling units, two groups of water outlet pipe assemblies, water return pipe assemblies, two groups of branch valves, and two groups of detection devices 153. One of the two groups of liquid cooling units, the two groups of water outlet pipe assemblies, the water return pipe assemblies, and the two groups of branch valves forms a first liquid cooling circuit. The other of the two groups of liquid cooling units, the two groups of water outlet pipe assemblies, the two groups of water return pipe assemblies, and the two groups of branch valves forms a second liquid cooling circuit. The first liquid cooling circuit is at least suitable for cooling the battery pack 170 located in the first battery rack 150. The second liquid cooling circuit is at least suitable for cooling the battery pack 170 located in the second battery rack 160. One of the two groups of detection devices 153 is suitable for being arranged in the first battery rack 150. The other of the two groups of detection devices 153 is suitable for being arranged in the second battery rack 160.

[0043] See also Figure 2 and Figure 3 , the first battery rack 150 includes three layers of first charging layers 152. The second battery rack 160 includes five layers of second charging layers 161. The two groups of liquid cooling units include the first liquid cooling unit 100 and the second liquid cooling unit 130. The two groups of water outlet pipe assemblies include the first water outlet pipe assembly 106 and the second water outlet pipe assembly 131. Among them, the first water outlet pipe assembly 106 includes a first water outlet main pipe component 107 and four first water outlet branch pipe components 108. Three of the four first water outlet branch pipe components 108 are arranged corresponding to the first battery rack 150, and the remaining first water outlet branch pipe component 108 is arranged corresponding to the second battery rack 160. The second water outlet pipe assembly 131 includes a second water outlet main pipe component 132 and four second water outlet branch pipe components 133. All four second water outlet branch pipe components 133 are arranged corresponding to the second battery rack 160. The two groups of return pipe assemblies include the first return pipe assembly 109 and the second return pipe assembly 134. The first water return pipe assembly 109 includes a first water return main pipe 111 and four first water return branch pipes 112. Three of the four first water return branch pipes 112 are arranged corresponding to the first battery rack 150. The second water return pipe assembly 134 includes a second water return main pipe 135 and four second water return branch pipes 136. All four second water return branch pipes 136 are arranged corresponding to the second battery rack 160. The two groups of branch valves include four first branch valves 113 and four second branch valves 137. The four first branch valves 113 are respectively arranged on the four first water outlet branch pipes 108. The four second branch valves 137 are respectively arranged on the four second water outlet branch pipes 133.

[0044] See also Figure 1, the first liquid cooling unit 100 and the second liquid cooling unit 130 are the same. Taking the first liquid cooling unit 100 as an example, the first liquid cooling unit 100 includes a liquid pump device 101 and a cold source device 103. Among them, the liquid pump device 101 is used to provide power for the circulation of the coolant. The liquid pump device 101 includes a water pump 102. The cold source device 103 is used to provide coldness to the circulation pipeline of the coolant. The cold source device 103 includes a compressor 104 and a heat exchanger 105. The circulation pipeline between the compressor 104 and the heat exchanger 105 is used to circulate the refrigerant. When the refrigerant flows through the heat exchanger 105, it exchanges heat with the coolant flowing back from the battery pack 170 to the first liquid cooling unit 100, so that the coolant obtains coldness.

[0045] exist Figure 2 and Figure 3 In the example shown, two groups of bypass pipes and bypass valves are provided. The two groups of bypass pipes include a first bypass pipe 114 and a second bypass pipe 138. The first bypass pipe 114 is connected to the first water outlet main pipe 107. The second bypass pipe 138 is connected to the second water outlet main pipe 132. The two groups of bypass valves include a first bypass valve 115 and a second bypass valve 139. The first bypass valve 115 is provided on the first bypass pipe 114. The second bypass valve 139 is provided on the second bypass pipe 138.

[0046] It is understood that in the battery swap station with the first battery rack 150 and the second battery rack 160 used in the liquid cooling system of the present application, the number of the first charging layers 152 is set according to the specific application and can be other than three layers. The number of the second charging layers 161 is set according to the specific application and can be other than five layers.

[0047] It is understandable that in the liquid cooling system of the present application, the number of the first water outlet branch pipe members 108 in the first water outlet pipe assembly 106 may be other numbers. The number of the second water outlet branch pipe members 133 in the second water outlet pipe assembly 131 may be other numbers. The number of the first water outlet branch pipe members 108 may be equal to or unequal to the number of the second water outlet branch pipe members 133. When the number of the first water outlet branch pipe members 108 is equal to the number of the second water outlet branch pipe members 133, it is helpful to balance the workload of the first liquid cooling unit 100 and the second liquid cooling unit 130. The number of the first water return branch pipe members 112 in the first water return pipe assembly 109 may be other numbers. The number of the second water return branch pipe members 136 in the second water return pipe assembly 134 may be other numbers. The number of the first water return branch pipe members 112 and the number of the second water return branch pipe members 136 may be equal to or unequal to each other. When the number of the first water return branch pipes 112 is equal to the number of the second water return branch pipes 136 , it helps to balance the working loads of the first liquid cooling unit 100 and the second liquid cooling unit 130 .

[0048] It is understandable that in some other battery swap stations where the liquid cooling system of the present application is used, a battery rack may not be provided.

[0049] See also Figure 3 In this embodiment, the detection device 153 is a travel switch, which can reduce the cost while meeting the application requirements of detecting the position of the battery pack 170. In other optional embodiments, the detection device 153 is a position sensor. In addition, the detection device 153 can also be other detection devices with position sensing functions other than the travel switch and the position sensor, such as a micro switch.

[0050] Optionally, each of the branch pipe valves mentioned above may be a solenoid valve such as an electric two-way valve.

[0051] See also Figure 4 , take the control of the first branch valve 113 by the control device 120 as an example. The control device 120 controls whether the power supply circuit of the first branch valve 113 is connected by controlling the switch state of the relay 181. Specifically, the normally closed contact of the relay 181, the power supply 182 and the first branch valve 113 are connected in series. The control device 120 controls the coil of the relay 181 to be energized, so that the normally closed contact of the relay 181 is closed, so that the first branch valve 113 is energized. Similarly, the control device 120 controls the coil of the relay 181 to be de-energized, so that the normally closed contact of the relay 181 is disconnected, so that the first branch valve 113 is de-energized. The first branch valve 113 is energized corresponding to one of the open state and the closed state. The first branch valve 113 is de-energized corresponding to the other of the open state and the closed state. Therefore, the control device 120 can control the first branch valve 113 to switch between the open state and the closed state.

[0052] Optionally, the control device 120 may be a programmable logic controller, ie, a PLC. The control device 120 may also be a single chip microcomputer or other control device with programmable and logic control functions.

[0053] The liquid cooling system of the present application is a liquid cooling system having a liquid cooling unit and a coolant circulation flow path, which can simplify the system equipment and the control process of the system and reduce the safety risks of the system.

[0054] See also Figures 1 to 4 The embodiment of the present application also provides a liquid cooling control method, which is applied to the above-mentioned battery swap station. The liquid cooling control method includes: When any detection device 153 detects that the battery pack 170 is in place, the detection device 153 sends a presence signal to the control device 120, and the control device 120 receives the presence signal sent by the detection device 153. The control device 120 can control the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to an open state according to the presence signal; When any detection device 153 detects that the battery pack 170 is not in place, the detection device 153 does not send a presence signal to the control device 120, and the control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state.

[0055] According to the liquid cooling control method of this embodiment, the opening and closing state of the branch valve of the corresponding water outlet pipe can be controlled according to whether the battery pack 170 is in place, thereby realizing automatic control of the liquid cooling system. The liquid cooling control method simplifies the control logic, which is conducive to improving the program control efficiency and program control stability, and further helps to improve the efficiency of cooling the battery pack 170 and reduce the cost.

[0056] In some embodiments, if the detection device 153 is a detection device 153 that can send both a presence signal and an absence signal, the liquid cooling control method includes: When any detection device 153 detects that the battery pack 170 is not in place, the detection device 153 sends an absence signal to the control device 120, and the control device 120 receives the absence signal sent by the detection device 153. The control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state according to the absence signal.

[0057] In some embodiments, the control device 120 can determine that the battery pack 170 is not in place according to the disappearance of the in-place signal. Therefore, the liquid cooling control method includes: When any detection device 153 detects that the battery pack 170 is not in place, the control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state according to the disappearance of the in-place signal.

[0058] Furthermore, when the control device 120 has a delay function, the liquid cooling control method includes: When any detection device 153 detects that the battery pack 170 is not in place, the control device 120 controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state when the in-place signal disappears for a preset time.

[0059] In other examples, the control device 120 may immediately control the branch valve on the water outlet branch pipe connected to the corresponding battery pack 170 to switch to a closed state when the presence signal disappears.

[0060] For the liquid cooling system of a battery swap station, the maximum number of battery packs 170 that can be connected is a fixed value. When the total amount of coolant provided by the outlet pipe is constant, a reduction in the number of battery packs 170 in place will cause the pressure of the outlet pipe to increase, which in turn will cause the pressure difference between the outlet pipe and the return pipe to increase. For the outlet pipe, if the same pipe diameter and material as the return pipe are used, there may be a risk of pipe bursting or a sharp reduction in life; if the outlet pipe is different from the return pipe in terms of pipe diameter and material, the complexity of the production process will increase, and the manufacturing cost will increase.

[0061] In order to solve the above problem, in some embodiments, the control device 120 has a counting function. The number of detection devices 153 that send out in-place signals is recorded as a.

[0062] The liquid cooling control method also includes: When a≥c, the control device 120 controls the bypass valve to switch to a closed state, and when a<c, the control device 120 controls the bypass valve to switch to an open state. Wherein, c is a preset value. The preset value c is stored in the control device 120.

[0063] According to this embodiment, the opening and closing state of the bypass valve can be automatically controlled according to whether the number of detection devices 153 that send out in-place signals exceeds a preset value, so as to control whether the coolant in the water outlet main pipe is diverted to the water return main pipe, thereby achieving the purpose of automatically balancing the pressure of the water outlet main pipe when the number of battery packs 170 in place is large and the number of battery packs 170 in place is small, thereby protecting the water outlet main pipe. Moreover, it is beneficial to use the same water outlet main pipe as the water return main pipe, thereby reducing production costs. In this embodiment, the bypass valve can be an electric two-way valve, which has only two states: open and closed.

[0064] In order to solve the above problem, in some other embodiments, the control device 120 has a counting function. The number of the detection devices 153 that send out the presence signal is recorded as a.

[0065] The liquid cooling control method also includes: According to the change of the quantity value a of the detection device 153 that sends the in-place signal, the control device 120 controls the bypass valve to change the opening, and the opening of the bypass valve is negatively correlated with the quantity value a.

[0066] That is, the larger the quantity value a is, the smaller the opening of the bypass valve is, thereby reducing the amount of coolant diverted by the bypass pipe, ensuring that the larger demand for coolant from the battery pack 170 can be met. The smaller the quantity value a is, the less the demand for coolant from the battery pack 170 is, and the larger the opening of the bypass valve is, thereby increasing the amount of coolant diverted by the bypass pipe, so that more coolant flows to the return water main pipe through the bypass pipe, thereby reducing the pressure of the water outlet main pipe, that is, balancing the pressure of the water outlet main pipe when corresponding to different numbers of battery packs in place.

[0067] According to this embodiment, the bypass valve can be automatically controlled to change its opening according to the change in the number of detection devices 153 that send out the in-place signal, so as to adaptively adjust the amount of coolant diverted from the water outlet main pipe to the water return main pipe, thereby achieving the purpose of balancing the pressure of the water outlet main pipe when providing coolant to battery packs with different numbers of in-place, thereby protecting the water outlet main pipe. In this embodiment, the bypass valve can be a proportional flow valve, which has not only two states of open and closed, but also any intermediate state with a corresponding opening between the open state and the closed state.

[0068] Specifically, after receiving the in-place signal, the control device 120 first determines the number of battery packs 170 in place, as follows: The presence status of each battery pack 170 is detected by a detection device 153. When the control device 120 receives a presence signals, it can determine that the number of battery packs 170 in place is a.

[0069] After determining the number of battery packs 170 in place, the control device 120 controls the bypass valve to change to an opening that matches the number of battery packs 170 in place, as follows: The control device 120 has a preset correspondence table between the number of battery packs 170 in place and the opening of the bypass valve. Based on the correspondence table and the determined number of battery packs 170 in place, the control device 120 sends an opening control signal to the bypass valve or a circuit board connected to the bypass valve to change the opening of the bypass valve to a corresponding size.

[0070] For example, the battery rack can accommodate up to 4 battery packs 170 and the bypass valve has four opening levels: When the number of battery packs 170 in place is 0, the opening of the bypass valve is controlled to be 100% of the maximum opening; The number of battery packs 170 in place is 0, which means that the demand for coolant by the battery pack 170 is 0. The coolant in the water outlet main component does not need to flow to the battery pack 170. The opening of the bypass valve is adjusted to the maximum, and the coolant in the water outlet main component flows to the return water main component through the bypass pipe, thereby avoiding the coolant gathering in the water outlet main component and causing excessive pressure in the water outlet main component.

[0071] When the number of battery packs 170 in place is 1, the opening of the bypass valve is controlled to be 75% of the maximum opening; When the number of battery packs 170 in place is 2, the opening of the bypass valve is controlled to be 50% of the maximum opening; When the number of battery packs 170 in place is 3, the opening of the bypass valve is controlled to be 25% of the maximum opening; When the number of battery packs 170 in place is 4, the bypass valve is controlled to be closed.

[0072] As the number of battery packs 170 increases, the demand for coolant by the battery packs 170 increases, and the opening of the bypass valve decreases as the number of battery packs 170 increases, reducing the flow of coolant diverted from the bypass pipe, allowing more coolant to flow to the battery packs 170 for use.

[0073] At the same time, when the number of battery packs 170 in place is not zero but is relatively small, the flow of coolant in the water outlet main component to the battery pack 170 is still relatively small. If the bypass valve is completely closed, the water outlet main component will still be under greater pressure. Therefore, the opening of the bypass valve gradually decreases as the number of battery packs 170 in place increases, so as to achieve balanced regulation of the pressure of the water outlet main component.

[0074] The following is an example of a bypass valve with three openings: When the number of battery packs in place is ≤1, the opening of the bypass valve is controlled to be 75% of the maximum opening; When the number of battery packs in place is ≥2 and the number of battery packs in place is <4, the opening of the bypass valve is controlled to be 50% of the maximum opening; When the number of battery packs in place is 4, the bypass valve is controlled to close.

[0075] In order to realize the above functions, the control device 120 stores and can execute programs related to the above methods, or the control device 120 can execute programs related to the above methods stored in a storage medium.

[0076] The following embodiment is used to illustrate the method of controlling the rotation speed of the water pump 102 according to the embodiment of the present application.

[0077] In order to control the rotation speed of the water pump 102, in some embodiments, the liquid cooling control method further includes: According to the change of the quantity value a of the detection device 153 that sends the in-place signal, the control device 120 controls the rotation speed of the water pump 102, and the rotation speed of the water pump 102 is positively correlated with the quantity value a.

[0078] According to this embodiment, the change in the number of battery packs 170 in place can be determined based on the change in the number value a of the detection device 153 that sends the in-place signal, thereby controlling the rotation speed of the water pump 102. The more battery packs 170 in place, the higher the rotation speed of the water pump 102 to meet the demand for coolant from more battery packs 170. The fewer battery packs 170 in place, the lower the rotation speed of the water pump 102 to reduce the pressure in the water outlet main pipe. It can be understood that the method for adjusting the rotation speed of the water pump 102 is dynamic. Using this method, the rotation speed of the water pump 102 can be controlled to increase as the number value a increases, and the rotation speed of the water pump 102 can be controlled to decrease as the number value a decreases.

[0079] When the number of battery packs 170 in place increases, it is necessary to increase the flow rate of the coolant in the water outlet main pipe. In order to increase the flow rate of the coolant, it is necessary to increase the speed of the water pump 102. Correspondingly, when the number of battery packs 170 in place decreases, it is necessary to reduce the flow rate of the coolant in the water outlet main pipe. In order to reduce the flow rate of the coolant, it is necessary to reduce the speed of the water pump 102. It can be seen that the flow rate of the coolant output by the water pump 102 is positively correlated with the number of battery packs 170 in place. The water pump 102 here refers in particular to an electronic water pump. According to the water pump characteristic formula, it can be seen that the flow rate Q is proportional to the speed n. For example, when the speed of an electronic water pump increases from 2000r / min to 4000r / min at rated voltage, the flow rate increases from 10L / min to 20L / min. Therefore, the number of battery packs 170 in place is positively correlated with the speed of the electronic water pump. In order to control the flow rate of the coolant pumped out by the electronic water pump, this can be achieved by controlling the rotation speed of the electronic water pump.

[0080] The following takes the example that each water pump 102 supplies coolant to a maximum of four battery packs 170 to illustrate the relationship between the rotation speed of the water pump 102 and the number of battery packs 170 in place.

[0081] When it is detected that 0 battery packs 170 are in place, the speed of the water pump 102 is controlled to be zero; When it is detected that one battery pack 170 is in place, the water pump 102 is controlled to run at 25% of the rated speed; When it is detected that two battery packs 170 are in place, the water pump 102 is controlled to run at 50% of the rated speed; When it is detected that three battery packs 170 are in place, the water pump 102 is controlled to run at 75% of the rated speed; When it is detected that four battery packs 170 are in place, the water pump 102 is controlled to run at a rated speed. In order to control the speed of the water pump 102, in other embodiments, the liquid cooling control method further includes: The control device 120 receives the PWM signal of the water pump 102 and determines the duty cycle b of the water pump 102 according to the PWM signal; According to the change of the duty cycle b, the control device 120 controls the rotation speed of the water pump 102, and the rotation speed of the water pump 102 is at least partially positively correlated with the duty cycle b.

[0082] According to this embodiment, the duty cycle of the water pump 102 can be determined based on the PWM signal fed back by the water pump 102, so that the speed of the water pump 102 can be controlled based on the change of the duty cycle, which helps to more accurately control the speed of the water pump 102 and further more accurately control the flow rate of the coolant.

[0083] Among them, PWM is a technology that uses digital signals (high and low levels) to simulate analog signals. Its core is to indirectly control the average voltage or power of the output by adjusting the duty cycle of the pulse signal (the proportion of the high level time to the entire cycle). Duty cycle is one of the key parameters of PWM, which refers to the proportion of the high level time to the cycle. The formula for duty cycle is duty cycle = (high level time / cycle) × 100%, ranging from 0% to 100%. For example, a duty cycle of 50% means that the high level and low level time are equal. PWM realizes the control of analog circuits by digital signals through duty cycle adjustment, and its core lies in "time proportion control". Its applications cover all aspects of electronic equipment, from simple LED dimming to complex industrial motor drives, all relying on the high efficiency and flexibility of PWM.

[0084] Among them, the speed of the water pump 102 is at least partially positively correlated with the duty cycle b, which can be understood as the speed of the water pump 102 is related to the duty cycle interval. If the step-by-step speed regulation is adopted, the speed of the water pump 102 is a fixed value in some duty cycle intervals, and the speed of the water pump 102 will increase with the increase of the duty cycle and decrease with the decrease of the duty cycle in other duty cycle intervals, which means that the speed of the water pump 102 is partially positively correlated with the duty cycle b. If the linear speed regulation is adopted, the speed of the water pump 102 always increases with the increase of the duty cycle and decreases with the decrease of the duty cycle, which also means that the speed of the water pump 102 is completely positively correlated with the duty cycle b.

[0085] In this embodiment, the water pump 102 is an electronic water pump. This embodiment can also accurately control the speed of the electronic water pump according to the PWM signal fed back by the electronic water pump. The core control logic is: the control device 120 analyzes the duty cycle change or encoding information in the PWM signal fed back by the electronic water pump, and dynamically adjusts the duty cycle of the output PWM in combination with a preset algorithm (such as PID or FOC), thereby accurately controlling the speed of the electronic water pump. The specific process is as follows: (1) Input control: The control device 120 sends an operation instruction to the driving circuit of the electronic water pump through the PWM duty cycle according to the target speed. The target speed is the speed corresponding to the required flow rate that matches the number of battery packs 170 in place.

[0086] (2) Feedback status: The built-in sensor (such as Hall element, current sensor) of the electronic water pump detects the actual speed, encodes the speed information into a PWM duty cycle and transmits it back to the control device 120, thereby the control device 120 determines the actual speed of the electronic water pump.

[0087] (3) Dynamic adjustment: The control device 120 compares the target speed with the actual speed, and uses the PID algorithm to correct the duty cycle of the PWM sent to the electronic water pump in real time, thereby controlling the actual speed to approach the target speed, and further controlling the flow rate of the coolant.

[0088] Further, when 0%≤b<10%, the control device 120 controls the speed of the water pump 102 to be 0; When 10%≤b<50%, the control device 120 controls the speed of the water pump 102 to be v1; When 50%≤b<90%, the control device 120 controls the speed of the water pump 102 to be v2; When 90%≤b≤100%, the control device 120 controls the rotation speed of the water pump 102 to be v3.

[0089] Wherein, v1<v2<v3, v1 is a fixed value, v3 is a fixed value and is the maximum value of the rotation speed of the water pump 102. v2 is a variable value, and v2 is linearly positively correlated with the duty cycle b.

[0090] According to this embodiment, the water pump 102 can be adjusted in four gears according to the duty cycle interval, and has a duty cycle interval suitable for linear speed regulation, further improving the control accuracy of the water pump 102 speed and compatibility with more application scenarios.

[0091] Optionally, v1 is a reference speed. The reference speed of the water pump 102 generally refers to a standard or design speed under specific conditions, and this value may vary depending on the application, design, and specific control strategy. The specific value of the reference speed may also vary for different application scenarios and equipment types. v2 is determined based on a linear correlation parameter between the speed and duty cycle of the motor of the water pump 102. For a certain water pump, the linear correlation parameter between the speed and duty cycle of its motor is determined. v3 is the rated speed of the motor of the water pump 102.

[0092] Of course, the specific values ​​of the rotation speed v1, v2, and v3 of the water pump 102 can be determined according to actual conditions; the interval of the duty cycle b that controls the change in the rotation speed of the water pump 102 can also be adaptively adjusted differently from the present embodiment.

[0093] The water pump 102 is an electronic water pump. The step-by-step speed regulation of the electronic water pump is to control the speed of the electronic water pump based on the PWM duty cycle interval. The core logic and implementation principle of the step-by-step speed regulation are described below.

[0094] 1. The core logic of speed regulation in different stages By dividing the PWM duty cycle into 4 key intervals, the electronic water pump can achieve precise control of different speed ranges. Each interval corresponds to a specific function and speed range, as follows:

[0095] In the table, rpm (Revolutions Per Minute) is a common unit of speed, indicating the number of revolutions per minute of a device. It is a standard unit for describing the speed of rotating machinery (such as motors, pumps, engines, etc.) in engineering and industry.

[0096] 2. Implementation principle of step-by-step speed regulation (1) Stop state (0-10% duty cycle) When the duty cycle is lower than 10%, the average PWM voltage is lower than the motor start threshold (such as below 3V), and the motor has no torque output.

[0097] (2) Minimum speed operation (10%-50% duty cycle) In the range of 10%-50% duty cycle, the motor efficiency is the highest (typical value 80%-90%), which is suitable for normal working conditions (such as low-load operation of cooling system). The output pressure is maintained stable (error ±2%) through the closed-loop PID algorithm.

[0098] (3) Linear speed regulation range (50%-90% duty cycle) For every 1% increase in duty cycle, the speed increases by about 50-100 rpm (depending on the motor parameters).

[0099] (4) Maximum speed operation (90%-100% duty cycle) When the duty cycle is close to 100%, the motor reaches the rated speed (such as 5000 rpm) and the flow rate reaches the maximum value. It is necessary to ensure that the power supply voltage and the drive circuit (such as the H-bridge drive circuit) can withstand the peak current (such as a 3V system needs to limit the current to ≤2A).

[0100] The liquid cooling control method of the present application monitors the status of the battery pack 170, regulates the opening and closing of each valve on the pipeline and the rotation speed of the water pump 102 in the liquid cooling unit, realizes the control of the valve body interception flow of the outlet pipe assembly and the bypass pipe, and the circulation flow rate of the coolant in the liquid cooling unit, can balance the pipeline pressure, and reduce the risk of pipe burst. The present application realizes the autonomous control of the liquid cooling system, simplifies the pipeline structure, and simplifies the control logic. The liquid cooling control method provided by the present application does not require the participation of the battery pack BMS system feedback, does not need to obtain the temperature data of the battery pack 170, and the original data required for control is the status of each battery pack 170, which greatly simplifies the complexity of the program control process and the program, and the program control efficiency is higher.

[0101] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0102] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. A liquid cooling system for a battery swap station, characterized in that: The liquid cooling system comprises: Liquid cooling unit; A water outlet pipe assembly, the water outlet pipe assembly comprising a water outlet main pipe and a plurality of water outlet branch pipes, one end of the water outlet main pipe is connected to the water outlet of the liquid cooling unit, one end of the water outlet branch pipe is connected to an end of the water outlet main pipe away from the liquid cooling unit, and the other end of the water outlet branch pipe is suitable for connecting to a battery pack; A water return pipe assembly, the water return pipe assembly comprising a water return main pipe and a plurality of water return branch pipes, one end of the water return main pipe is connected to the water return port of the liquid cooling unit, one end of the water return branch pipe is connected to an end of the water return main pipe away from the liquid cooling unit, and the other end of the water return branch pipe is suitable for connecting to a battery pack; A plurality of branch valves, each of which is respectively arranged on each of the water outlet branch pipes; A plurality of detection devices, each of which is used to detect the presence of each battery pack; and A control device, wherein the control device is electrically connected to the detection device and the branch valve, the detection device is configured to send an in-place signal to the control device when the battery pack is in place, and the control device is configured to control the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch between an open state and a closed state according to whether the in-place signal is received.

2. The liquid cooling system according to claim 1, characterized in that: The liquid cooling system also includes: A bypass pipe fitting, two ends of which are respectively connected to the water outlet main pipe fitting and the water return main pipe fitting; and A bypass valve, wherein the bypass valve is arranged on the bypass pipe fitting, The control device is also electrically connected to the bypass valve, and is further configured to control the bypass valve to switch between an open state and a closed state and / or control the bypass valve to change its opening degree according to the number of the detection devices that send the in-place signal.

3. The liquid cooling system according to claim 1 or 2, characterized in that: The liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The control device is further configured to control the rotation speed of the water pump according to the number of the detection devices that send the presence signal, or to control the rotation speed of the water pump according to the duty cycle of the water pump.

4. The liquid cooling system according to claim 1 or 2, characterized in that: The detection device is a travel switch or a position sensor.

5. A battery swap station, characterized in that: The battery swap station comprises at least one battery rack and a liquid cooling system according to any one of claims 1 to 4; The battery rack includes multiple charging layers, and the charging layers are suitable for placing the battery pack and charging the battery pack; Each of the detection devices is respectively arranged at each of the charging layers to detect whether each battery pack is located at the charging layer.

6. A liquid cooling control method, applied to the battery swap station according to claim 5, characterized in that: The liquid cooling control method comprises: When any of the detection devices detects that a battery pack is in place, the detection device sends a presence signal to the control device, and the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to an open state; When any detection device detects that the battery pack is not in place, the detection device does not send a presence signal to the control device, and the control device controls the branch valve on the water outlet branch pipe connected to the corresponding battery pack to switch to a closed state.

7. The liquid cooling control method according to claim 6, characterized in that: The liquid cooling system also includes: A bypass pipe fitting, two ends of which are respectively connected to the water outlet main pipe fitting and the water return main pipe fitting; and A bypass valve, wherein the bypass valve is arranged on the bypass pipe fitting, The liquid cooling control method further includes: When a≥c, the control device controls the bypass valve to switch to a closed state, and when a<c, the control device controls the bypass valve to switch to an open state, wherein a is the number value of the detection device that sends the in-place signal, and c is a preset value; or According to the change of the quantity value a of the detection device that sends the in-place signal, the control device controls the bypass valve to change the opening, and the opening of the bypass valve is negatively correlated with the quantity value a.

8. The liquid cooling control method according to claim 6 or 7, characterized in that: The liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The liquid cooling control method further includes: According to the change of the quantity value a of the detection device that sends the in-place signal, the control device controls the rotation speed of the water pump, and the rotation speed of the water pump is positively correlated with the quantity value a.

9. The liquid cooling control method according to claim 6 or 7, characterized in that: The liquid cooling unit includes a water pump, and the control device is also electrically connected to the water pump; The liquid cooling control method further includes: The control device receives a PWM signal of the water pump and determines a duty cycle b of the water pump according to the PWM signal; According to the change of the duty cycle b, the control device controls the rotation speed of the water pump, and the rotation speed of the water pump is at least partially positively correlated with the duty cycle b.

10. The liquid cooling control method according to claim 9, characterized in that: When 0%≤b<10%, the control device controls the speed of the water pump to 0; When 10%≤b<50%, the control device controls the speed of the water pump to be v1; When 50%≤b<90%, the control device controls the speed of the water pump to be v2; When 90%≤b≤100%, the control device controls the speed of the water pump to be v3; Wherein, v1<v2<v3, v1 is a fixed value, v3 is a fixed value and is the maximum value of the rotation speed of the water pump; v2 is a changing value, and v2 is linearly positively correlated with the duty cycle b.

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