Thermal management system and control method of electric industrial vehicle

Abstract

The present invention discloses a thermal management system for an electric industrial vehicle and a control method thereof, which comprises a first circuit and a second circuit for thermal management of a power system and a power battery system respectively, wherein a first heat exchange tank and a second heat exchange tank are connected via a coupling device, and a temperature sensor is connected to the first circuit and the second circuit; the thermal management system further comprises a control device, and the control device is electrically connected to the first circuit, the second circuit and the coupling device respectively. The thermal management system can effectively control the temperature of the power system and the power battery system at the same time, and can use the waste heat of the power system to keep the power battery system warm, reduce the energy consumption of the thermal management system, improve the efficiency of the thermal management system, reduce the cost and improve the reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal management of electric vehicles, and in particular relates to a thermal management system of an electric industrial vehicle and a control method thereof. Background Art

[0002] Traditional electric industrial vehicles mainly use lead-acid power battery systems and AC asynchronous motor power systems as mainstream technical solutions, both of which generally use natural cooling for heat dissipation. Since electric industrial vehicles are in a state of high current charging and discharging and high load operation for a long time, the power battery system and the power system will generate a large amount of accumulated heat load. If the high load operation continues, the power system and the power battery system will enter the thermal protection state and stop working; when the ambient temperature is low, the available power of the power battery system will be actively reduced. If there is no forced heating or insulation measures, it will cause irreversible life damage to the power battery system. If it is in an extremely low ambient temperature and there is no forced heating measures, the power battery system will stop charging and discharging.

[0003] At present, with the development of new energy technologies, the power battery system of electric industrial vehicles is gradually transforming to a lithium battery power system, and the power system motor is gradually upgrading to a more efficient permanent magnet synchronous motor. In view of the more sensitive temperature characteristics of lithium batteries and permanent magnet synchronous motors compared to lead-acid batteries and AC asynchronous motors, the existing natural cooling measures without a thermal management system can no longer meet the use requirements of various systems; and adding a separate fan and heating PTC for thermal management of the power battery system will result in high energy consumption and low thermal management efficiency, while lacking thermal management measures for the power system. Summary of the invention

[0004] In view of this, it is necessary for the present invention to provide a thermal management system for an electric industrial vehicle and a control method thereof, which can effectively control the temperature of the power system and the power battery system at the same time, and can use the waste heat of the power system to keep the power battery system warm, thereby reducing the energy consumption of the thermal management system, improving the efficiency of the thermal management system, while reducing costs and improving reliability, so as to solve the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a thermal management system for an electric industrial vehicle, which comprises a first circuit and a second circuit for respectively performing thermal management on a power system and a power battery system, wherein the first circuit is formed by sequentially connecting a first heat exchange water tank, a first electronic water pump, and a first heat dissipation water channel for heat dissipation of a housing through pipelines, and the second circuit is formed by sequentially connecting a second heat exchange water tank, a water-heating PTC, a second electronic water pump, and a second heat dissipation water channel for heat dissipation of a bottom plate through pipelines, wherein the first heat exchange water tank and the second heat exchange water tank are connected through a coupling device, and temperature sensors are connected to both the first circuit and the second circuit; the thermal management system further comprises a control device, and the control device is electrically connected to the first circuit, the second circuit, and the coupling device, respectively.

[0007] Further, the temperature sensor includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor which are electrically connected to the control device respectively: the first temperature sensor is arranged at the water inlet of the first heat dissipation water channel, and the second temperature sensor is arranged at the water outlet of the first heat dissipation water channel;

[0008] The third temperature sensor is disposed at the water inlet of the second heat dissipation water channel, and the fourth temperature sensor is disposed at the water outlet of the second heat dissipation water channel.

[0009] Furthermore, the first heat exchange water tank comprises a water outlet, a water inlet, a water filling port, a coupling water port and a breathable cap, and the structure of the second heat exchange water tank is the same as that of the first heat exchange water tank.

[0010] Furthermore, the first heat exchange tank is provided with a first fan, the second heat exchange tank is provided with a second fan, the first fan and the second fan are electrically connected to the control device respectively, and the rotation speeds of the first fan and the second fan are adjustable.

[0011] Furthermore, the first electronic water pump and the second electronic water pump are electrically connected to the control device respectively, and the rotation speeds of the first electronic water pump and the second electronic water pump are adjustable.

[0012] Furthermore, the coupling device includes an electromagnetic water valve, which is respectively connected to the first water exchange tank and the second water exchange tank through pipelines, and the electromagnetic water valve is electrically connected to the control device.

[0013] Preferably, the electromagnetic water valve is a normally closed two-way electromagnetic valve.

[0014] Furthermore, a heat conducting material is provided on the bottom plate.

[0015] The present invention also provides a control method for a thermal management system as described in any one of the above, comprising the following steps:

[0016] The control device receives temperature signals from temperature sensors in the first circuit and the second circuit, and determines the coolant temperature in the first circuit and the second circuit;

[0017] The control device receives temperature signals from the temperature sensor inside the power system and the temperature sensor inside the power battery system, and determines the temperature of the power system and the power battery system;

[0018] The thermal management system is turned on or off according to the coolant temperature in the first circuit and the second circuit, the temperature of the power system and the power battery system.

[0019] Furthermore, the specific steps of controlling the thermal management system to be turned on or off according to the coolant temperature in the first circuit and the second circuit, the temperature of the power system and the power battery system are as follows:

[0020] When the control device determines that the coolant temperature in the first circuit is not higher than the coolant temperature in the second circuit, or the control device determines that the temperature signal value of the temperature sensor inside the power battery system in the second circuit does not reach the temperature for heating management of the second circuit, the coupling device is closed, and the first circuit and the second circuit are disconnected from each other and enter their respective independent working modes: when the control device determines that the temperature signal of the temperature sensor inside the power system is lower than the set temperature of the power system, the power system enters the thermal management system shutdown mode; when the control device determines that the temperature signal of the temperature sensor inside the power system is higher than the set temperature, the power system enters the heat dissipation mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heat dissipation set temperature and higher than its heating set temperature, the power battery system enters the thermal management system shutdown mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is higher than its heat dissipation set temperature, the power battery system enters the heat dissipation mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heating set temperature, the power battery system enters the heating mode;

[0021] When the control device determines that the coolant temperature in the first circuit is higher than the coolant temperature in the second circuit, and the temperature of the internal temperature sensor of the power battery system in the second circuit is higher than the temperature signal value of the second circuit for heating management, the first circuit and the second circuit are coupled and connected, the power system enters the heat dissipation mode and the power battery system enters the heating mode.

[0022] Compared with the prior art, the thermal management system in the present invention can perform heat management on the power system and the power battery system respectively, and by coupling the first circuit for thermal management of the power system with the second circuit for thermal management of the power battery system, it is ensured that the operating temperature of the power system and the power battery system is always controlled within a reasonable range, thereby realizing the thermal management of the entire industrial vehicle; the thermal management system realizes the function of heating and keeping the power battery system warm by utilizing the waste heat of the power system by coupling the first circuit and the second circuit, so that the entire thermal management system has high working efficiency, improves the energy utilization rate of the industrial vehicle and the service life of the power battery, reduces energy consumption and increases the operating time of the industrial vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An electrical connection topology diagram of a thermal management system in a preferred embodiment of the present invention;

[0024] Figure 2 for Figure 1 A topological diagram in which the first circuit 10 and the second circuit 20 are connected via an electromagnetic water valve 30;

[0025] Figure 3 for Figure 1 A schematic structural diagram of the first water exchange tank 101;

[0026] Figure 4 It is a schematic diagram of the coolant flow direction when the first circuit 10 works alone;

[0027] Figure 5 It is a schematic diagram of the coolant flow direction when the second circuit 20 works alone;

[0028] Figure 6 It is a schematic diagram of the coolant flow direction when the first circuit 10 and the second circuit 20 are coupled and working.

[0029] In the figure: first circuit 10, first heat exchange water tank 101, water outlet 1011, water inlet 1012, water filling port 1013, air permeable cap 1014, coupling water port 1015, first fan 1016, first electronic water pump 102, first temperature sensor 103, first heat dissipation water channel 104, second temperature sensor 105;

[0030] The second circuit 20, the second water exchange tank 201, the second fan 2016, the water heating PTC 202, the second electronic water pump 203, the third temperature sensor 204, the second heat dissipation water channel 205, and the fourth temperature sensor 206;

[0031] Solenoid water valve 30;

[0032] Control device 40. DETAILED DESCRIPTION

[0033] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] Electric industrial vehicles generally include a power system and a power battery system. This embodiment discloses a thermal management system for electric industrial vehicles. Figure 1 As shown in, the thermal management system includes a first circuit 10, a second circuit 20 and a control device 40. The first circuit 10 is used to perform thermal management on the power system, and the second circuit 20 is used to perform thermal management on the power battery system. The first circuit 10 and the second circuit 20 are connected by a coupling device, and the control device 40 is respectively connected to the first circuit 10, the second circuit 20 and the coupling device. The thermal management system is controlled by controlling the first circuit 10, the second circuit 20 and the coupling device. It can be understood that the control device 40 here can be any conventional controller in the field, which can realize functions such as signal acquisition and sending instructions, which will not be elaborated here.

[0036] For further information, see Figure 2 The first circuit 10 is formed by connecting the first heat exchange water tank 101, the first electronic water pump 102, the first temperature sensor 103, the first heat dissipation channel 104 and the second temperature sensor 105 in sequence. The first heat dissipation channel 104 is used to dissipate heat from the housing. The housing here refers to the housing of the motor and the motor controller in the power system. The first heat dissipation channel 104 is arranged inside the housing. Further, as Figure 3As shown in the figure, the first water exchange tank 101 is respectively provided with a water outlet 1011, a water inlet 1012, a water filling port 1013, a breathable cap 1014 and a coupling water port 1015, and their distribution is not specifically limited, and can be designed according to the layout of the first circuit 10 and the layout of the thermal management system. A first fan 1016 is also installed on the first water exchange tank 101. The installation method of the first fan 1016 on the first water exchange tank 101 is conventional in the field, and is usually arranged on the side of the first water exchange tank 101, which will not be elaborated here. In this embodiment, the water outlet 1011 and the coupling water inlet 1015 are respectively located on the lower side of the first heat exchange water tank 101, and the water inlet 1012, the water filling port 1013 and the breathable cap 1014 are respectively located on the upper end surface of the first heat exchange water tank 101, which is convenient for adding coolant and other operations. More specifically, in the first circuit 10, the water outlet 1011 of the first heat exchange water tank 101 is connected to the water inlet of the first electronic water pump 102, the water outlet of the first electronic water pump 102 is connected to the water inlet of the first heat dissipation water channel 104, and the first temperature sensor 103 is arranged on the first At the water inlet of the heat dissipation water channel 104, the water outlet of the first heat dissipation water channel 104 is connected to the water inlet 1012 of the first heat exchange water tank 101, and the second temperature sensor 105 is arranged at the water outlet of the first heat dissipation water channel 104. The first temperature sensor 103 and the second temperature sensor 105 are used to detect the water temperature of the first heat dissipation water channel 104. It can be understood that the connection here is through connecting the pipe joint at the corresponding port, and connecting through the pipe joint and the pipeline. Since the connection between the pipe joint and the pipeline belongs to a known connection method, it will not be described in detail here. For further information, please continue to refer to Figure 1 The first fan 1016 , the first electronic water pump 102 , the first temperature sensor 103 , and the second temperature sensor 105 are electrically connected to the control device 40 respectively and are controlled by the control device 40 .

[0037] See also Figure 2 The second circuit 20 is formed by connecting the second heat exchange water tank 201, the water-heating PTC 202, the second electronic water pump 203, the third temperature sensor 204, the second heat dissipation channel 205 and the fourth temperature sensor 206 in sequence, wherein the second heat dissipation channel 205 is used to dissipate heat from the bottom plate in the power battery system, where the bottom plate refers to the battery bottom plate. It should be noted that the structure of the second heat exchange water tank 201 is the same as that of the first heat exchange water tank 101, and a second fan 2016 is installed on its side, which will not be elaborated here. Specifically, Figure 2As shown in, in the second circuit 20, the water outlet of the second heat exchange water tank 201 is connected to the water heating PTC 202 and the second electronic water pump 203 in sequence, the water outlet of the second electronic water pump 203 is connected to the water inlet of the second heat dissipation water channel 205, the third temperature sensor 204 is arranged at the water inlet of the second heat dissipation water channel 205, the water outlet of the second heat dissipation water channel 205 is connected to the water inlet of the second heat exchange water tank 201, the fourth temperature sensor 206 is arranged at the water outlet of the second heat dissipation water channel 205, the third temperature sensor 204 and the fourth temperature sensor 206 are used to detect the water temperature in the second heat dissipation water channel 205. It can also be understood that the connections described here are all to connect pipe joints at the corresponding ports, and to connect through pipe joints and pipelines. Since the connection between pipe joints and pipelines belongs to a known connection method, it will not be elaborated in detail. For further information, please continue to refer to Figure 1 The second fan 2016, the water-heating PTC 202, the second electronic water pump 203, the third temperature sensor 204 and the fourth temperature sensor 206 are electrically connected to the control device 40, respectively, and the control device 40 receives the temperature signals thereof. It is understood that the electrical connection described herein, unless otherwise specified, refers to the electrical connection of the control device 40 and related electrical components through a wiring harness.

[0038] It should also be noted that temperature sensors (not shown in the figure) are also configured inside the power system and the power battery system. Since it is a conventional configuration, it will not be explained in detail here. The control device 40 in this embodiment is also electrically connected to the temperature sensors inside the power system and the power battery system, and cooperates with the temperature sensors in the first circuit 10 and the second circuit 20 to achieve thermal management of the electric industrial vehicle.

[0039] Furthermore, preferably, in the present embodiment, the first electronic water pump 102, the first fan 1016, the second electronic water pump 203, and the second fan 2016 are all of adjustable speed type, and the speed can be adjusted according to actual conditions through the control device 40, thereby meeting the thermal management requirements while maximizing the reduction of energy consumption of the thermal management system.

[0040] For further information, please refer to Figure 2 The first circuit 10 and the second circuit 20 are connected through a coupling device, and the coupling device mainly includes an electromagnetic water valve 30. Specifically, the coupling water port 1015 of the first heat exchange water tank 101 is connected to one of the valve ports of the electromagnetic water valve 30, and the other valve port of the electromagnetic water valve 30 is connected to the coupling water port of the second heat exchange water tank 201. The connection here is also through a pipe joint and a pipeline connection, which will not be elaborated here. The electromagnetic water valve 30 is electrically connected to the control device 40. In this embodiment, the electromagnetic water valve 30 is a normally closed two-way electromagnetic valve, and the control device 40 can control the opening / closing of the electromagnetic water valve 30.

[0041] Furthermore, in the thermal management system of the present embodiment, a thermally conductive material is also provided on the bottom plate of the power battery system, which can realize the heat exchange between the battery module and the battery bottom plate chassis, and further improve the thermal management effect. It can be understood that the thermally conductive material here can adopt conventional ones in the field, and specific examples include but are not limited to thermal grease, thermally conductive silicone pads, etc.

[0042] The present embodiment further discloses a control method for the thermal management system, which is controlled by a control device 40. The heating or cooling demand is calculated according to the temperature signals of the first temperature sensor 103, the second temperature sensor 105, the third temperature sensor 204 or the fourth temperature sensor 206, in cooperation with the temperature signals sent by the temperature sensors inside the power system and the temperature sensors inside the power battery system, and the first electronic water pump 102, the second electronic water pump 203, the first fan 1016, the second fan 2016, the water-heating PTC 202 or the electromagnetic water valve 30 are comprehensively controlled. Specifically, the control device 40 receives the temperature signals of the first temperature sensor 103, the second temperature sensor 105, the third temperature sensor 204 and the fourth temperature sensor 206, and calculates the coolant temperature in the first circuit 10 through the temperature signals of the first temperature sensor 103 and the second temperature sensor 105, and calculates the coolant temperature in the second circuit 20 through the temperature signals of the third temperature sensor 204 and the fourth temperature sensor 206:

[0043] 1. When the control device 40 determines that the coolant temperature in the first circuit 10 is not higher than the coolant temperature in the second circuit 20, or the control device 40 determines that the temperature signal value of the temperature sensor inside the power battery system in the second circuit 20 does not reach the set temperature in the second circuit 20 (i.e., the temperature at which the second circuit 20 performs heating management), the first circuit 10 and the second circuit 20 are not connected to each other, and the thermal management system enters a mode in which the first circuit 10 and the second circuit 20 work independently, and the control device 40 controls the electromagnetic water valve 30 to close, and the first circuit 10 and the second circuit 20 are not connected to each other.

[0044] (1) When the control device 40 detects that the temperature signal of the temperature sensor inside the power system is lower than the set temperature of the power system, the control device 40 controls the power system to enter the thermal management system shutdown mode: at this time, the control device 40 controls the first electronic water pump 102 and the first fan 1016 in the first circuit 10 to be turned off, and the coolant in the first circuit 10 does not flow;

[0045] (2) When the control device 40 detects that the temperature signal of the temperature sensor inside the power system is higher than the set temperature, the control device 40 controls the power system to enter the cooling mode: at this time, the control device 40 controls the first electronic water pump 102 in the first circuit to turn on and the first fan 1016 to turn on or off. At this time, the running direction of the coolant in the first circuit 10 is as follows: Figure 4 As shown in , the coolant flows out from the first water exchange tank 101 , passes through the first electronic water pump 102 and the first heat dissipation water channel 104 in sequence, and then flows back to the first water exchange tank 101 .

[0046] (3) When the control device 40 detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heat dissipation setting temperature and higher than its heating setting temperature, the control device 40 controls the power battery system to enter the thermal management system shutdown mode: at this time, the control device 40 controls the second electronic water pump 203, the water-heating PTC 202 and the second fan 2016 in the second circuit 20 to be turned off, and the coolant in the second circuit 20 does not flow.

[0047] (4) When the control device 40 detects that the temperature signal of the temperature sensor inside the power battery system is higher than its heat dissipation setting temperature, the control device 40 controls the power battery system to enter the heat dissipation mode: at this time, the control device 40 controls the second electronic water pump 203 in the second circuit 20 to turn on, the second fan 2016 to turn on or off, and the water heating PTC 202 to turn off. At this time, the flow direction of the coolant in the second circuit 20 is as follows: Figure 5 As shown in , the coolant flows out from the second water exchange tank 201 , passes through the second electronic water pump 203 and the second heat dissipation water channel 205 in sequence, and then flows back to the second water exchange tank 201 .

[0048] (5) When the control device 40 detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heating setting temperature, the control device 40 controls the power battery system to enter the heating mode: at this time, the control device 40 controls the second electronic water pump 203 in the second circuit 20 to turn on, the second fan 2016 to turn off, and the water-heating PTC 202 to turn on. At this time, the coolant in the second circuit 20 flows in the same direction as Figure 5 As shown in .

[0049] 2. When the control device 40 determines that the coolant temperature in the first circuit 10 is higher than the coolant temperature in the second circuit 20, and the control device 40 determines that the temperature signal value of the internal temperature sensor of the power battery system in the second circuit 20 is higher than the temperature signal value of the second circuit 20 for heating management, the thermal management system enters the state of coupling operation of the first circuit 10 and the second circuit 20. At this time, the control device 40 controls the electromagnetic water valve 30 to open, connecting the first circuit 10 and the second circuit 20. At this time, the state of the thermal management system is that the power system enters the heat dissipation mode and the power battery system enters the heating mode, which is as follows:

[0050] The control device 40 controls the first electronic water pump 102 in the first circuit 10 to turn on and the first fan 1016 to turn on or off; at the same time, the second electronic water pump 203 in the second circuit 20 is turned on, the second fan 2016 is not turned on, and the water-heating PTC 202 is not turned on; at this time, the flow direction of the coolant is as follows Figure 6 As shown in: the first heat exchange tank 101 of the first circuit 10 and the second heat exchange tank 201 of the second circuit 20 are connected by a coupling device; in the second circuit 20, the coolant flows back to the second heat exchange tank 201 through the relevant pipelines via the second heat exchange tank 201, the second electronic water pump 203, and the second heat dissipation water channel 205; in the first circuit 10, the coolant flows back to the first heat exchange tank 101 through the relevant pipelines via the first heat exchange tank 101, the first electronic water pump 102, and the first heat dissipation water channel 104. By mixing the coolant in the first heat exchange tank 101 and the second heat exchange tank 201, the power system is radiated through the first circuit 10, and the power battery system is heated through the second circuit 20. This mode is usually started under low temperature conditions, and there is no need to turn on the water heating PTC 202 for heating, which saves energy. The heat emitted by the power system can be used to keep the power battery system warm or heat it, thereby improving the working efficiency of the thermal management system.

[0051] From the above, it can be seen that the electric industrial vehicle thermal management system of the present invention can perform heat management on the power system and the power battery system respectively, and couple the thermal management circuit of the power system with the thermal management circuit of the power battery system to ensure that the operating temperature of the power system and the power battery system is always controlled within a reasonable range. At the same time, through the coupling of the thermal management circuit, the function of heating and keeping the power battery system warm by utilizing the waste heat of the power system is realized. The entire thermal management system has high working efficiency, improves the energy utilization rate of the industrial vehicle and the service life of the power battery, reduces energy consumption and increases the operating time of the industrial vehicle; in addition, the thermal management system uses an electronic water pump and an electronic fan with adjustable speed, and through the energy-saving control algorithm of the controller, the electronic water pump, the electronic fan and the water-heating PTC are reasonably controlled to maximize the reduction of the energy consumption of the thermal management system while meeting the needs of the thermal management system.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A thermal management system for an electric industrial vehicle, comprising a first circuit and a second circuit for thermal management of a power system and a power battery system, respectively, characterized in that: The first circuit is formed by connecting a first heat exchange water tank, a first electronic water pump, and a first heat dissipation water channel for heat dissipation of the housing in sequence through pipelines; the second circuit is formed by connecting a second heat exchange water tank, a water-heating PTC, a second electronic water pump, and a second heat dissipation water channel for heat dissipation of the bottom plate in sequence through pipelines; the first heat exchange water tank and the second heat exchange water tank are connected by a coupling device, and temperature sensors are connected to the first circuit and the second circuit; the thermal management system also includes a control device, which is electrically connected to the first circuit, the second circuit, and the coupling device respectively; The first heat exchange water tank comprises a water outlet, a water inlet, a water filling port, a coupling water port and a breathable cap, and the structure of the second heat exchange water tank is the same as that of the first heat exchange water tank; The coupling device includes an electromagnetic water valve, which is respectively connected to the first water exchange tank and the second water exchange tank through pipelines, and the electromagnetic water valve is electrically connected to the control device.

2. The thermal management system according to claim 1, characterized in that: The temperature sensor comprises a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor which are electrically connected to the control device respectively: the first temperature sensor is arranged at the water inlet of the first heat dissipation water channel, and the second temperature sensor is arranged at the water outlet of the first heat dissipation water channel; The third temperature sensor is disposed at the water inlet of the second heat dissipation water channel, and the fourth temperature sensor is disposed at the water outlet of the second heat dissipation water channel.

3. The thermal management system according to claim 1, characterized in that: The first heat exchange water tank is provided with a first fan, the second heat exchange water tank is provided with a second fan, the first fan and the second fan are electrically connected to the control device respectively, and the rotation speeds of the first fan and the second fan are adjustable.

4. The thermal management system according to claim 1, characterized in that: The first electronic water pump and the second electronic water pump are electrically connected to the control device respectively, and the rotation speeds of the first electronic water pump and the second electronic water pump are adjustable.

5. The thermal management system according to claim 1, characterized in that: The electromagnetic water valve is a normally closed two-way electromagnetic valve.

6. The thermal management system according to claim 1, wherein: The bottom plate is provided with heat conducting material.

7. The control method of a thermal management system according to any one of claims 1 to 6, characterized in that: The following steps are involved: The control device receives temperature signals from temperature sensors in the first circuit and the second circuit, and determines the coolant temperature in the first circuit and the second circuit; The control device receives temperature signals from the temperature sensor inside the power system and the temperature sensor inside the power battery system, and determines the temperature of the power system and the power battery system; The thermal management system is turned on or off according to the coolant temperature in the first circuit and the second circuit, the temperature of the power system and the power battery system.

8. The control method according to claim 7, characterized in that: The specific steps of controlling the thermal management system to turn on or off according to the coolant temperature in the first circuit and the second circuit, the temperature of the power system and the power battery system are as follows: When the control device determines that the coolant temperature in the first circuit is not higher than the coolant temperature in the second circuit, or the control device determines that the temperature signal value of the temperature sensor inside the power battery system in the second circuit does not reach the temperature for heating management of the second circuit, the coupling device is closed, and the first circuit and the second circuit are disconnected from each other and enter their respective independent working modes: when the control device determines that the temperature signal of the temperature sensor inside the power system is lower than the set temperature of the power system, the power system enters the thermal management system shutdown mode; when the control device determines that the temperature signal of the temperature sensor inside the power system is higher than the set temperature, the power system enters the heat dissipation mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heat dissipation set temperature and higher than its heating set temperature, the power battery system enters the thermal management system shutdown mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is higher than its heat dissipation set temperature, the power battery system enters the heat dissipation mode; when the control device detects that the temperature signal of the temperature sensor inside the power battery system is lower than its heating set temperature, the power battery system enters the heating mode; When the control device determines that the coolant temperature in the first circuit is higher than the coolant temperature in the second circuit, and the temperature of the internal temperature sensor of the power battery system in the second circuit is higher than the temperature signal value of the second circuit for heating management, the first circuit and the second circuit are coupled and connected, the power system enters the heat dissipation mode and the power battery system enters the heating mode.

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