Thermal management system, method, and vehicle

Abstract

The application relates to a heat management system, a method and a vehicle, and belongs to the technical field of heat management. The heat management system comprises an electric drive heat management circuit, a battery heat management circuit and a passenger cabin heat management circuit; a multi-way valve is arranged between the electric drive heat management circuit and the battery heat management circuit, and is used for controlling the electric drive heat management circuit and the battery heat management circuit to be connected in series or independent of each other by opening and closing different valve ports; a heat exchanger is arranged between the battery heat management circuit and the passenger cabin heat management circuit; and a control device is used for controlling the opening and closing relationship between different valve ports of the multi-way valve according to the temperature of a power battery, so as to control the electric drive heat management circuit and the battery heat management circuit to be connected in series or independent of each other. Through the system provided by the application, heat flow can be reasonably distributed, the cost of the heat management system can be reduced, the cruising range can be improved, and the waste heat utilization efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, specifically to a thermal management system, a thermal management method, and a vehicle. Background Technology

[0002] With the increasing demand for environmental protection both domestically and internationally, and the technological need for electrification in transportation vehicles (such as electric vehicles and electric ships), the development of electric vehicles and electric ships has been strongly encouraged and promoted by governments around the world. In electric transportation vehicles, some components require cooling, while others require both cooling and heating control. The rational allocation and management of the cooling and heating of each component, the precise temperature control of each component, the rational management of heat flow, and the reduction of losses in the thermal management system are the current technical challenges and core issues of thermal management systems.

[0003] In current technologies, thermal management of various components is still in the stage of independent management. For example, the thermal management system of an electric vehicle includes three separate thermal management components: a passenger compartment cooling and heating system, a battery pack temperature control system, and a cooling water circulation system for the electric drive system (electric drive motor controller). The passenger compartment cooling and heating system relies on air conditioning control, while the electric drive system relies on independent water cooling to dissipate heat. At the same time, the power battery, due to its high power and long-term operation, requires water cooling, resulting in the loss of heat without any utilization. The thermal management system is costly and cannot rationally allocate heat flow, wasting a lot of energy in both cooling and heating, thus reducing the driving range of electric vehicles. Summary of the Invention

[0004] One objective of this invention is to provide a thermal management system to solve the problems of high cost and inability to rationally allocate heat flow in existing thermal management systems, which waste a lot of energy in both cooling and heating, thus reducing the driving range of electric vehicles; a second objective is to provide a thermal management system method; and a third objective is to provide a vehicle.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A thermal management system includes: an electric drive thermal management circuit, a battery thermal management circuit, and a passenger cabin thermal management circuit;

[0007] A multi-way valve is disposed between the electric drive thermal management circuit and the battery thermal management circuit, and is used to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series by opening and closing different valve ports, or to control the electric drive thermal management circuit and the battery thermal management circuit to be independent of each other;

[0008] A heat exchanger is disposed between the battery thermal management circuit and the passenger cabin thermal management circuit to control the heat exchange between the battery thermal management circuit and the passenger cabin thermal management circuit.

[0009] The control device is used to control the on / off relationship between different valve ports of the multi-way valve according to the power battery temperature, so as to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series or independent of each other.

[0010] The method of the present invention is applicable not only to the thermal management system of electric vehicles, but also to the thermal management system of electric ships and other vehicles with electric drive, batteries and passenger cabins. Those skilled in the art can set it up according to the actual situation, and no limitation is made in the present invention.

[0011] Based on the above-mentioned technical means, heat flow can be rationally allocated, reducing energy consumption for cooling and heating, lowering the cost of the thermal management system, increasing driving range, pre-storing heat, releasing electric drive heat to the passenger compartment when needed, improving the overall vehicle energy efficiency ratio, and transferring electric drive heat to the power battery to improve waste heat utilization efficiency.

[0012] Furthermore, the power battery temperature includes the current highest temperature of a single battery cell; the step of controlling the on / off relationship between different valve ports of the multi-way valve according to the power battery temperature to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series or independent of each other includes: when the current highest temperature of a single battery cell is less than the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0013] Based on the above technical means, when the temperature of a single battery cell is lower than the maximum heat storage temperature of the single battery cell, the power battery can store heat, rationally allocate the heat flow, reduce energy waste, improve waste heat utilization efficiency, reduce the extra energy consumed for battery cooling during fast charging, and cool the electric drive through the power battery coolant to ensure the safe operation of the electric drive.

[0014] Furthermore, the electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit;

[0015] The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit;

[0016] The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery.

[0017] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to be connected to the fourth valve port and the second valve port to be connected to the third valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series;

[0018] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0019] Based on the above technical means, when the temperature of a single battery cell is lower than the maximum heat storage temperature of the single battery cell, the power battery can store heat, rationally allocate the heat flow, reduce energy waste, improve waste heat utilization efficiency, reduce the extra energy consumed for battery cooling during fast charging, and cool the electric drive through the power battery coolant to ensure the safe operation of the electric drive.

[0020] Furthermore, the electric drive thermal management circuit also includes: a three-way valve having a fifth valve port, a sixth valve port, and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system;

[0021] The control device is also used for:

[0022] Determine the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage.

[0023] When the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage, the fifth valve port and the seventh valve port are opened to input the electric drive coolant into the electric drive system by the electric drive water pump.

[0024] When the highest temperature of the electric drive system is greater than the highest temperature of the electric drive heat storage or the temperature of the coolant circuit is greater than the highest temperature of the coolant circuit heat storage, the fifth valve port and the sixth valve port are opened to allow the electric drive coolant to be input to the motor radiator by the electric drive water pump.

[0025] Based on the above technical means, when the electric drive system reaches its highest temperature and the coolant circuit temperature is low, the coolant can be directly transferred to the electric drive system to prevent the external motor radiator from dissipating heat and achieve the heat preservation function; when the electric drive system reaches its highest temperature and the coolant circuit temperature is low, the excess heat can be released to the outside to ensure the safety of the entire vehicle system.

[0026] Furthermore, the maximum battery thermal storage temperature is determined by the following methods: determining the power battery input power and the total battery capacity; using the correspondence between the power battery input power and the battery thermal storage temperature, determining the base maximum battery thermal storage temperature corresponding to the power battery input power; using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient, determining the base maximum battery thermal storage temperature coefficient corresponding to the total battery capacity; and determining the maximum battery thermal storage temperature based on the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient.

[0027] Based on the above technical means, the state of charge and input power of the power battery can be identified, and the maximum temperature of battery heat storage can be accurately determined, so that the multi-way valve can be precisely controlled and the heat flow can be rationally distributed.

[0028] Furthermore, the maximum temperature of the electric drive heat storage is determined by the following methods: determining the motor waste heat power and the current ambient temperature; determining the basic maximum temperature of the electric drive heat storage corresponding to the motor waste heat power based on the correspondence between waste heat power and electric drive heat storage temperature; determining the basic maximum temperature coefficient of the electric drive heat storage corresponding to the current ambient temperature using the correspondence between the current ambient temperature and the electric drive heat storage temperature coefficient; and determining the maximum temperature of the electric drive heat storage based on the basic maximum temperature of the electric drive heat storage and the basic maximum temperature coefficient of the electric drive heat storage.

[0029] Based on the above technical means, the maximum heat storage temperature of the electric drive system can be accurately determined according to the waste heat power of the motor and the current ambient temperature. This allows for precise control of the three-way valve, reasonable management of the insulation and heat dissipation of the electric drive thermal management circuit, and ensures the safety of the entire vehicle system.

[0030] Furthermore, the maximum heat storage temperature of the coolant circuit is determined by the following method: determining the current ambient temperature; and determining the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature based on the correspondence between the current ambient temperature and the heat storage temperature of the coolant circuit.

[0031] Based on the above technical means, the maximum heat storage temperature of the coolant circuit can be accurately determined according to the ambient temperature, which enables precise control of the three-way valve, reasonable management of the insulation and heat dissipation of the electric drive thermal management circuit, and ensures the safety of the entire vehicle system.

[0032] A thermal management method, applied to the thermal management system described above, includes: controlling the on / off relationship between different valve ports of a multi-way valve set between the electric drive thermal management circuit and the battery thermal management circuit according to the power battery temperature, so as to control whether the electric drive thermal management circuit and the battery thermal management circuit are connected in series or independent of each other.

[0033] Furthermore, the power battery temperature includes the current highest temperature of a single battery cell; based on the power battery temperature, the on / off relationship between different valve ports of a multi-way valve connected between the electric drive thermal management circuit and the battery thermal management circuit is controlled to control whether the electric drive thermal management circuit and the battery thermal management circuit are connected in series or independent of each other, including: when the current highest temperature of a single battery cell is less than the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0034] Furthermore, the electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit;

[0035] The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit;

[0036] The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery.

[0037] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to connect with the fourth valve port and the second valve port to connect with the third valve port, so as to connect the electric drive thermal management circuit and the battery thermal management circuit in series.

[0038] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0039] Furthermore, the electric drive thermal management circuit also includes: a three-way valve having a fifth valve port, a sixth valve port, and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system;

[0040] The thermal management method further includes: determining the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage; when the maximum temperature of the electric drive system is less than or equal to the maximum temperature of the electric drive heat storage, and the coolant circuit temperature is less than or equal to the maximum temperature of the coolant circuit heat storage, opening the fifth valve port and the seventh valve port to input the electric drive coolant into the electric drive system by the electric drive water pump; when the maximum temperature of the electric drive system is greater than the maximum temperature of the electric drive heat storage or the coolant circuit temperature is greater than the maximum temperature of the coolant circuit heat storage, opening the fifth valve port and the sixth valve port to input the electric drive coolant into the motor radiator by the electric drive water pump.

[0041] Furthermore, the maximum battery thermal storage temperature is determined by the following methods: determining the power battery input power and the total battery capacity; using the correspondence between the power battery input power and the battery thermal storage temperature, determining the base maximum battery thermal storage temperature corresponding to the power battery input power; using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient, determining the base maximum battery thermal storage temperature coefficient corresponding to the total battery capacity; and determining the maximum battery thermal storage temperature based on the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient.

[0042] Furthermore, the maximum temperature of the electric drive heat storage is determined by the following methods: determining the motor waste heat power and the current ambient temperature; determining the basic maximum temperature of the electric drive heat storage corresponding to the motor waste heat power based on the correspondence between waste heat power and electric drive heat storage temperature; determining the basic maximum temperature coefficient of the electric drive heat storage corresponding to the current ambient temperature using the correspondence between the current ambient temperature and the electric drive heat storage temperature coefficient; and determining the maximum temperature of the electric drive heat storage based on the basic maximum temperature of the electric drive heat storage and the basic maximum temperature coefficient of the electric drive heat storage.

[0043] Furthermore, the maximum heat storage temperature of the coolant circuit is determined by the following method: determining the current ambient temperature; and determining the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature based on the correspondence between the current ambient temperature and the heat storage temperature of the coolant circuit.

[0044] A vehicle equipped with the thermal management system described above.

[0045] The beneficial effects of this invention are:

[0046] (1) The present invention can rationally allocate heat flow, reduce energy consumption for cooling and heating, and reduce the cost of thermal management system;

[0047] (2) The present invention can reduce energy consumption caused by thermal management and improve driving range;

[0048] (3) The present invention can store heat in advance and release electric drive heat to the passenger compartment when needed, thereby improving the overall vehicle energy consumption ratio and reducing the extra energy consumed for battery cooling during fast charging.

[0049] (4) The present invention can transfer the heat of the electric drive to the power battery, improve the waste heat utilization efficiency, reduce the extra energy consumed for battery cooling during fast charging, and cool the electric drive through the power battery coolant to ensure the safe operation of the electric drive. Attached Figure Description

[0050] Figure 1 A schematic diagram of a thermal management system provided in an embodiment of the present invention;

[0051] Figure 2 A flowchart of multi-way valve control in a thermal management method provided in an embodiment of the present invention;

[0052] Figure 3 A flowchart of the three-way valve control in the thermal management method provided in the embodiments of the present invention. Detailed Implementation

[0053] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0054] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0055] Please refer to Figure 1 This embodiment proposes a thermal management system, including: an electric drive thermal management circuit, a battery thermal management circuit, and a passenger cabin thermal management circuit;

[0056] A multi-way valve is disposed between the electric drive thermal management circuit and the battery thermal management circuit, and is used to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series by opening and closing different valve ports, or to control the electric drive thermal management circuit and the battery thermal management circuit to be independent of each other;

[0057] A heat exchanger is disposed between the battery thermal management circuit and the passenger cabin thermal management circuit to control the heat exchange between the battery thermal management circuit and the passenger cabin thermal management circuit.

[0058] The control device is used to control the on / off relationship between different valve ports of the multi-way valve according to the power battery temperature, so as to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series or independent of each other.

[0059] Specifically, in this embodiment of the invention, the thermal management system includes three thermal management loops: an electric drive thermal management loop, a battery thermal management loop, and a passenger cabin thermal management loop. A multi-way valve is provided between the electric drive thermal management loop and the battery thermal management loop. The multi-way valve can control the electric drive thermal management loop and the battery thermal management loop to be connected in series or to control the electric drive thermal management loop and the battery thermal management loop to be independent of each other.

[0060] The control device, connected to a multi-way valve, can acquire the power battery temperature. When the power battery temperature is low, excess heat from the electric drive is stored in the power battery. The internal passage of the multi-way valve is adjusted to connect the electric drive thermal management circuit and the battery thermal management circuit in series, allowing excess heat from the electric drive to be stored in the power battery. This waste heat collection is then used to cool the electric drive through the power battery coolant, ensuring safe operation. When the power battery temperature is high, the internal passage of the multi-way valve is adjusted to make the electric drive thermal management circuit and the battery thermal management circuit independent, with each circuit storing its own heat.

[0061] An internal heat exchanger is installed between the battery thermal management circuit and the passenger compartment thermal management circuit. This internal heat exchanger controls the heat exchange between the two circuits. The battery thermal management circuit includes a passenger compartment refrigerant circuit and a passenger compartment coolant circuit. The passenger compartment refrigerant circuit includes a compressor and an electronic expansion valve connected in series, while the passenger compartment coolant circuit includes a heating and ventilation pump and a heating and ventilation core connected in series. The internal heat exchanger is located on the passenger compartment refrigerant circuit from the compressor to the electronic expansion valve, and on the passenger compartment coolant circuit from the heating and ventilation core to the heating and ventilation pump, for heat exchange between the two circuits. If the maximum temperature of a single battery cell in the battery thermal management circuit exceeds the set temperature, and if the control device receives a user-triggered heating command, it controls the heat exchanger to transfer heat from the battery thermal management circuit to the passenger compartment thermal management circuit, using the excess heat from the power battery to raise the temperature of the passenger compartment.

[0062] Based on the above-mentioned technical means, heat flow can be rationally allocated, reducing energy consumption for cooling and heating, lowering the cost of the thermal management system, increasing driving range, pre-storing heat, releasing electric drive heat to the passenger compartment when needed, improving the overall vehicle energy efficiency ratio, and transferring electric drive heat to the power battery to improve waste heat utilization efficiency.

[0063] In this embodiment, the power battery temperature includes the current highest temperature of a single battery cell; controlling the on / off relationship between different valve ports of the multi-way valve according to the power battery temperature to control the electric drive thermal management circuit and the battery thermal management circuit to be connected in series or independent of each other includes: when the current highest temperature of a single battery cell is less than the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; and when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0064] Specifically, in this embodiment of the invention, the control device can determine the temperature of the power battery based on the current highest temperature of the individual battery cells. If the current highest temperature of the individual battery cells is lower than the maximum heat storage temperature of the battery, it indicates that the power battery temperature is low. Excess heat inside the electric drive can be stored in the power battery. The internal passage of the multi-way valve is adjusted to connect the electric drive thermal management circuit and the battery thermal management circuit in series, allowing excess heat inside the electric drive to be stored in the power battery. Waste heat is collected, and the electric drive is cooled by the power battery coolant to ensure safe operation. If the current highest temperature of the individual battery cells is greater than or equal to the maximum heat storage temperature of the battery, it indicates that the power battery temperature is too high, exceeding the upper limit of battery heat storage, and no more excess heat can be stored. Therefore, the control device adjusts the internal passage of the multi-way valve to make the electric drive thermal management circuit and the battery thermal management circuit independent, with each circuit storing heat independently.

[0065] Based on the above technical means, when the temperature of a single battery cell is lower than the maximum heat storage temperature of the single battery cell, the power battery can store heat, rationally allocate the heat flow, reduce energy waste, improve waste heat utilization efficiency, reduce the extra energy consumed for battery cooling during fast charging, and cool the electric drive through the power battery coolant to ensure the safe operation of the electric drive.

[0066] In this embodiment, the electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit;

[0067] The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit;

[0068] The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery.

[0069] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to be connected to the fourth valve port and the second valve port to be connected to the third valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series;

[0070] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0071] Specifically, in this embodiment of the invention, the electric drive thermal management circuit includes an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit. The battery thermal management circuit includes a battery water pump and a power battery connected in series in the battery coolant circuit. The multi-way valve has four valve ports: a first valve port, a second valve port, a third valve port, and a fourth valve port. The multi-way valve can connect multiple valve ports by switching its internal valves. The first valve port is connected to the electric drive water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery.

[0072] Please refer to Figure 2 The control device determines whether the current highest temperature of a single battery cell is lower than the maximum heat storage temperature of the battery. If the current highest temperature of a single battery cell is lower than the maximum heat storage temperature of the battery, the power battery is in a discharging state and the temperature is low. The control device connects the first valve port to the fourth valve port and the second valve port to the third valve port to connect the electric drive thermal management circuit and the battery thermal management circuit in series. This transfers the heat from the electric drive to the power battery, stores the heat, and cools the electric drive using the battery's cooling water, ensuring safe operation of the electric drive. When the battery is fast-charging and cooling of the power battery is required, the battery thermal management circuit can use the heat stored in the power battery to compensate for some of the energy consumption during cooling, reducing the extra energy consumed for cooling the battery during fast charging. If the current highest temperature of a single battery cell is greater than or equal to the maximum heat storage temperature of the battery, it indicates that the power battery temperature is too high, exceeding the battery's heat storage limit, and no more excess heat can be stored. The control device connects the first valve port to the second valve port and the third valve port to the fourth valve port to make the electric drive thermal management circuit and the battery thermal management circuit independent, storing their respective heat.

[0073] Based on the above technical means, when the temperature of a single battery cell is lower than the maximum heat storage temperature of the single battery cell, the power battery can store heat, rationally allocate the heat flow, reduce energy waste, improve waste heat utilization efficiency, reduce the extra energy consumed for battery cooling during fast charging, and cool the electric drive through the power battery coolant to ensure the safe operation of the electric drive.

[0074] In this embodiment, the electric drive thermal management circuit further includes: a three-way valve having a fifth valve port, a sixth valve port and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system;

[0075] The control device is also used for:

[0076] Determine the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage.

[0077] When the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage, the fifth valve port and the seventh valve port are opened to input the electric drive coolant into the electric drive system by the electric drive water pump.

[0078] When the highest temperature of the electric drive system is greater than the highest temperature of the electric drive heat storage or the temperature of the coolant circuit is greater than the highest temperature of the coolant circuit heat storage, the fifth valve port and the sixth valve port are opened to allow the electric drive coolant to be input to the motor radiator by the electric drive water pump.

[0079] Specifically, in this embodiment of the invention, a three-way valve is provided in the electric drive thermal management circuit. The three-way valve has three valve ports: a fifth valve port, a sixth valve port, and a seventh valve port. The fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system.

[0080] Please refer to Figure 3 The control device determines whether the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and whether the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage. If the temperatures of the electric drive system and the coolant circuit are low, i.e., the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage, it indicates that the overall temperature of the electric drive system is low and heat needs to be conserved. The control device only opens the fifth and seventh valve ports, controls the three-way valve on the electric drive side to switch to the bypass side, cuts off the connection of the other valve ports, and inputs the electric drive coolant from the electric drive water pump to the bypass side of the electric drive system without passing through the external motor radiator.

[0081] A high temperature in the electric drive system or the coolant circuit (i.e., the highest temperature of the electric drive system exceeds the highest temperature of the electric drive heat storage, or the coolant circuit temperature exceeds the highest temperature of the coolant circuit heat storage) indicates that the electric drive temperature is too high, which may affect the safe operation of the electric drive. The control device only opens the fifth and sixth valve ports, controlling the three-way valve on the electric drive side to switch to the motor radiator side, cutting off the connection of the other valve ports. This allows the electric drive coolant to be input to the motor radiator by the electric drive water pump, dissipating the heat from the electric drive to the outside.

[0082] Based on the above technical means, when the electric drive system reaches its highest temperature and the coolant circuit temperature is low, the coolant can be directly transferred to the electric drive system to prevent the external motor radiator from dissipating heat and achieve the heat preservation function; when the electric drive system reaches its highest temperature and the coolant circuit temperature is low, the excess heat can be released to the outside to ensure the safety of the entire vehicle system.

[0083] In this embodiment, the maximum battery thermal storage temperature is determined as follows: the input power of the power battery and the total battery capacity are determined; the maximum base battery thermal storage temperature corresponding to the input power of the power battery is determined using the correspondence between the input power of the power battery and the battery thermal storage temperature; the maximum base battery thermal storage temperature coefficient corresponding to the total battery capacity is determined using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient; and the maximum battery thermal storage temperature is determined based on the maximum base battery thermal storage temperature and the maximum base battery thermal storage temperature coefficient.

[0084] Specifically, in this embodiment of the invention, the power input power and total battery capacity transmitted by the power battery are received, and the highest base battery heat storage temperature T corresponding to the power battery input power is looked up from the table of correspondence between input power and battery heat storage temperature. BaseBotSavHeat Using the table showing the correspondence between battery capacity and battery thermal storage temperature coefficient, find the highest base battery thermal storage temperature coefficient K2 corresponding to the total battery capacity. Then, use the highest base battery thermal storage temperature T... BaseBotSavHeat Calculate the maximum battery storage temperature T using the base battery thermal maximum temperature coefficient K2. BatMaxSavHeat :T BatMaxSavHeat =T BaseBatSavHeat *K2.

[0085] Based on the above technical means, the state of charge and input power of the power battery can be identified, and the maximum temperature of battery heat storage can be accurately determined, so that the multi-way valve can be precisely controlled and the heat flow can be rationally distributed.

[0086] In this embodiment, the maximum temperature of the electric drive heat storage is determined as follows: the waste heat power of the motor and the current ambient temperature are determined; based on the correspondence between waste heat power and electric drive heat storage temperature, the basic maximum temperature of the electric drive heat storage corresponding to the waste heat power of the motor is determined; using the correspondence between the current ambient temperature and the electric drive heat storage temperature coefficient, the basic maximum temperature coefficient of the electric drive heat storage corresponding to the current ambient temperature is determined; and based on the basic maximum temperature of the electric drive heat storage and the basic maximum temperature coefficient of the electric drive heat storage, the maximum temperature of the electric drive heat storage is determined.

[0087] Specifically, in this embodiment of the invention, the current ambient temperature is obtained, and the motor waste heat power from the motor controller is received. Using a table showing the correspondence between waste heat power and electric drive heat storage temperature, the highest base electric drive heat storage temperature T corresponding to the motor waste heat power is found. BaseMotSavHeat By referring to the correspondence table between ambient temperature and electric drive thermal storage temperature coefficient, the highest basic electric drive thermal storage temperature coefficient K1 corresponding to the current ambient temperature is obtained. Based on the highest basic electric drive thermal storage temperature T... BaseMotSavHeat The maximum temperature T of the electric drive thermal storage is determined by the basic electric drive thermal storage maximum temperature coefficient K1. MotMaxSavHeat :T MotMaxSavHeat =T BaseMotSavHeat *K1.

[0088] Based on the above technical means, the maximum heat storage temperature of the electric drive system can be accurately determined according to the waste heat power of the motor and the current ambient temperature. This allows for precise control of the three-way valve, reasonable management of the insulation and heat dissipation of the electric drive thermal management circuit, and ensures the safety of the entire vehicle system.

[0089] In this embodiment, the maximum heat storage temperature of the coolant circuit is determined by the following method: determining the current ambient temperature; and determining the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature based on the correspondence between the current ambient temperature and the heat storage temperature of the coolant circuit.

[0090] Specifically, in this embodiment of the invention, the ambient temperature is obtained, and according to the correspondence table between ambient temperature and coolant heat storage temperature, the highest coolant circuit heat storage temperature T corresponding to the current ambient temperature is found. LoopMaxSavHeat .

[0091] Based on the above technical means, the maximum heat storage temperature of the coolant circuit can be accurately determined according to the ambient temperature, which enables precise control of the three-way valve, reasonable management of the insulation and heat dissipation of the electric drive thermal management circuit, and ensures the safety of the entire vehicle system.

[0092] A thermal management method, applied to the thermal management system described above, includes: controlling the on / off relationship between different valve ports of a multi-way valve set between the electric drive thermal management circuit and the battery thermal management circuit according to the power battery temperature, so as to control whether the electric drive thermal management circuit and the battery thermal management circuit are connected in series or independent of each other.

[0093] The power battery temperature includes the current highest temperature of a single battery cell. Based on the power battery temperature, the on / off relationship between different valve ports of a multi-way valve connected between the electric drive thermal management circuit and the battery thermal management circuit is controlled to control whether the electric drive thermal management circuit and the battery thermal management circuit are connected in series or independently. This includes: when the current highest temperature of a single battery cell is less than the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; and when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of battery heat storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0094] In this embodiment, the electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit;

[0095] The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit;

[0096] The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery.

[0097] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to connect with the fourth valve port and the second valve port to connect with the third valve port, so as to connect the electric drive thermal management circuit and the battery thermal management circuit in series.

[0098] The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

[0099] In this embodiment, the electric drive thermal management circuit further includes: a three-way valve having a fifth valve port, a sixth valve port, and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system;

[0100] The thermal management method further includes: determining the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage; when the maximum temperature of the electric drive system is less than or equal to the maximum temperature of the electric drive heat storage, and the coolant circuit temperature is less than or equal to the maximum temperature of the coolant circuit heat storage, opening the fifth valve port and the seventh valve port to input the electric drive coolant into the electric drive system by the electric drive water pump; when the maximum temperature of the electric drive system is greater than the maximum temperature of the electric drive heat storage or the coolant circuit temperature is greater than the maximum temperature of the coolant circuit heat storage, opening the fifth valve port and the sixth valve port to input the electric drive coolant into the motor radiator by the electric drive water pump.

[0101] In this embodiment, the maximum battery thermal storage temperature is determined as follows: the input power of the power battery and the total battery capacity are determined; the maximum base battery thermal storage temperature corresponding to the input power of the power battery is determined using the correspondence between the input power of the power battery and the battery thermal storage temperature; the maximum base battery thermal storage temperature coefficient corresponding to the total battery capacity is determined using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient; and the maximum battery thermal storage temperature is determined based on the maximum base battery thermal storage temperature and the maximum base battery thermal storage temperature coefficient.

[0102] In this embodiment, the maximum temperature of the electric drive heat storage is determined by the following methods: determining the motor waste heat power and the current ambient temperature; determining the basic maximum temperature of the electric drive heat storage corresponding to the motor waste heat power based on the correspondence between waste heat power and electric drive heat storage temperature; determining the basic maximum temperature coefficient of the electric drive heat storage corresponding to the current ambient temperature using the correspondence between the current ambient temperature and the electric drive heat storage temperature coefficient; and determining the maximum temperature of the electric drive heat storage based on the basic maximum temperature of the electric drive heat storage and the basic maximum temperature coefficient of the electric drive heat storage.

[0103] In this embodiment, the maximum heat storage temperature of the coolant circuit is determined by the following method: determining the current ambient temperature; and determining the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature based on the correspondence between the current ambient temperature and the heat storage temperature of the coolant circuit.

[0104] A vehicle equipped with the thermal management system described above.

[0105] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A thermal management system, the thermal management system comprising: The thermal management system comprises an electric drive thermal management circuit, a battery thermal management circuit, and a passenger cabin thermal management circuit, characterized in that the thermal management system further includes: A multi-way valve is disposed between the electric drive thermal management circuit and the battery thermal management circuit, and is used to control the switching between the electric drive thermal management circuit and the battery thermal management circuit in series and independently by opening and closing different valve ports; A heat exchanger is disposed between the battery thermal management circuit and the passenger cabin thermal management circuit to control the heat exchange between the battery thermal management circuit and the passenger cabin thermal management circuit. A control device is used to control the on / off relationship between different valve ports of the multi-way valve according to the power battery temperature, so as to control the switching between series connection and independent connection between the electric drive thermal management circuit and the battery thermal management circuit; specifically, it includes: when the current highest temperature of a single battery cell is lower than the highest temperature of battery storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of battery storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent; the power battery temperature includes the current highest temperature of a single battery cell; The maximum battery thermal storage temperature is determined as follows: The input power of the power battery and the total battery capacity are determined; using the correspondence between the power battery input power and the battery thermal storage temperature, the base maximum battery thermal storage temperature corresponding to the power battery input power is determined; using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient, the base maximum battery thermal storage temperature coefficient corresponding to the total battery capacity is determined; based on the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient, the maximum battery thermal storage temperature is determined, wherein the maximum battery thermal storage temperature is the product of the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient.

2. The thermal management system according to claim 1, characterized in that, The electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit; The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit; The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery. The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to be connected to the fourth valve port and the second valve port to be connected to the third valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

3. The thermal management system according to claim 2, characterized in that, The electric drive thermal management circuit further includes: a three-way valve having a fifth valve port, a sixth valve port and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system; The control device is also used for: Determine the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage. When the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage, the fifth valve port and the seventh valve port are opened to input the electric drive coolant into the electric drive system by the electric drive water pump. When the highest temperature of the electric drive system is greater than the highest temperature of the electric drive heat storage or the temperature of the coolant circuit is greater than the highest temperature of the coolant circuit heat storage, the fifth valve port and the sixth valve port are opened to allow the electric drive coolant to be input to the motor radiator by the electric drive water pump.

4. The thermal management system according to claim 3, characterized in that, The maximum temperature of the electric-driven thermal storage is determined in the following way: Determine the motor's waste heat power and the current ambient temperature; Based on the correspondence between waste heat power and electric drive heat storage temperature, determine the maximum basic electric drive heat storage temperature corresponding to the motor waste heat power. By utilizing the correlation between the current ambient temperature and the electric drive thermal storage temperature coefficient, the maximum basic electric drive thermal storage temperature coefficient corresponding to the current ambient temperature is determined. The maximum temperature of the electric drive heat storage is determined based on the maximum temperature of the basic electric drive heat storage and the coefficient of the maximum temperature of the basic electric drive heat storage.

5. The thermal management system according to claim 3, characterized in that, The maximum heat storage temperature of the coolant circuit is determined by the following method: Determine the current ambient temperature; Based on the correlation between the current ambient temperature and the heat storage temperature of the coolant circuit, determine the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature.

6. A thermal management method, applied to the thermal management system according to any one of claims 1-5, characterized in that, The thermal management method includes: Based on the power battery temperature, the on / off relationship between different valve ports of a multi-way valve located between the electric drive thermal management circuit and the battery thermal management circuit is controlled to switch the electric drive thermal management circuit and the battery thermal management circuit between series connection and independent operation. Specifically, this includes: when the current highest temperature of a single battery cell is lower than the highest temperature of the battery storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series; when the current highest temperature of a single battery cell is greater than or equal to the highest temperature of the battery storage, controlling the on / off relationship between different valve ports of the multi-way valve so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other; the power battery temperature includes the current highest temperature of a single battery cell. The maximum battery thermal storage temperature is determined as follows: The input power of the power battery and the total battery capacity are determined; using the correspondence between the power battery input power and the battery thermal storage temperature, the base maximum battery thermal storage temperature corresponding to the power battery input power is determined; using the correspondence between the total battery capacity and the battery thermal storage temperature coefficient, the base maximum battery thermal storage temperature coefficient corresponding to the total battery capacity is determined; based on the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient, the maximum battery thermal storage temperature is determined, wherein the maximum battery thermal storage temperature is the product of the base maximum battery thermal storage temperature and the base maximum battery thermal storage temperature coefficient.

7. The thermal management method according to claim 6, characterized in that, The electric drive thermal management circuit includes: an electric drive water pump, a motor radiator, and an electric drive system connected in series in the electric drive coolant circuit; The battery thermal management circuit includes: a battery water pump and a power battery connected in series in the battery coolant circuit; The multi-port valve has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the electric water pump, the second valve port is connected to the electric drive system, the third valve port is connected to the battery water pump, and the fourth valve port is connected to the power battery. The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, so that the electric drive thermal management circuit and the battery thermal management circuit are connected in series, includes: when the current highest temperature of the battery cell is lower than the highest temperature of the battery storage, controlling the first valve port to connect with the fourth valve port and the second valve port to connect with the third valve port, so as to connect the electric drive thermal management circuit and the battery thermal management circuit in series. The step of controlling the on / off relationship between different valve ports of the multi-way valve when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other, includes: when the current highest temperature of the battery cell is greater than or equal to the highest temperature of the battery heat storage, controlling the first valve port to be connected to the second valve port, and the third valve port to be connected to the fourth valve port, so that the electric drive thermal management circuit and the battery thermal management circuit are independent of each other.

8. The thermal management method according to claim 7, characterized in that, The electric drive thermal management circuit further includes: a three-way valve having a fifth valve port, a sixth valve port and a seventh valve port, wherein the fifth valve port is connected to the electric drive water pump, the sixth valve port is connected to the motor radiator, and the seventh valve port is connected to the electric drive system; The thermal management method further includes: Determine the maximum temperature of the electric drive system, the maximum temperature of the electric drive heat storage, the coolant circuit temperature, and the maximum temperature of the coolant circuit heat storage. When the highest temperature of the electric drive system is less than or equal to the highest temperature of the electric drive heat storage, and the temperature of the coolant circuit is less than or equal to the highest temperature of the coolant circuit heat storage, the fifth valve port and the seventh valve port are opened to input the electric drive coolant into the electric drive system by the electric drive water pump. When the highest temperature of the electric drive system is greater than the highest temperature of the electric drive heat storage or the temperature of the coolant circuit is greater than the highest temperature of the coolant circuit heat storage, the fifth valve port and the sixth valve port are opened to allow the electric drive coolant to be input to the motor radiator by the electric drive water pump.

9. The thermal management method according to claim 8, characterized in that, The maximum temperature of the electric-driven thermal storage is determined in the following way: Determine the motor's waste heat power and the current ambient temperature; Based on the correspondence between waste heat power and electric drive heat storage temperature, determine the maximum basic electric drive heat storage temperature corresponding to the waste heat power of the motor. By utilizing the correlation between the current ambient temperature and the electric drive thermal storage temperature coefficient, the maximum basic electric drive thermal storage temperature coefficient corresponding to the current ambient temperature is determined. The maximum temperature of the electric drive heat storage is determined based on the maximum temperature of the basic electric drive heat storage and the coefficient of the maximum temperature of the basic electric drive heat storage.

10. The thermal management method according to claim 8, characterized in that, The maximum heat storage temperature of the coolant circuit is determined by the following method: Determine the current ambient temperature; Based on the correlation between the current ambient temperature and the heat storage temperature of the coolant circuit, determine the maximum heat storage temperature of the coolant circuit corresponding to the current ambient temperature.

11. A vehicle, characterized in that, The system is equipped with the thermal management system described in any one of claims 1-5.

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