Electric vehicle thermal management system and thermal management method thereof

Abstract

The present invention discloses an electric vehicle thermal management system and a thermal management method thereof. The electric vehicle thermal management system comprises: a battery pack, a motor controller, a drive motor and a control mechanism. The battery pack, the motor controller and the drive motor are electrically connected in sequence. The motor controller and the drive motor also heat the battery pack through a heat exchange system. The control mechanism is connected to the motor controller and the drive motor. The control mechanism controls the drive motor to decouple from the vehicle transmission system, and controls the motor controller to control the drive motor to accelerate and decelerate. The heat generated by the motor controller and the drive motor is used to heat the battery pack. The present invention heats the battery by the heat generated by the motor controller and the drive motor. The power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field related to electric vehicles, and in particular to an electric vehicle thermal management system, a thermal management method of the electric vehicle thermal management system, an electronic device, a storage medium and a computer program product. Background Art

[0002] Currently, electric vehicles on the market are generally heated in winter using positive temperature coefficient thermistors (PTCs), which then use thermal management fluid to bring the heat to the battery water cooling plate. The battery temperature is raised from a low temperature state through heat exchange, thereby achieving a comfortable operating range for the battery at low temperatures. In this way, the acceleration performance and charging performance of electric vehicles at low temperatures can be achieved.

[0003] like Figure 1 The figure shows a thermal management system of an electric vehicle in the prior art, wherein the battery pack 100 supplies power to the motor controller 300, the drive motor 400 and the PTC 700 through the power management module 200, wherein the drive motor 400 is a three-phase motor including the U, V and W phases. The drive motor 400 may also be provided with a reduction gearbox. The drive motor 400 is cooled by the oil pump 500 and the oil cooler 600. The battery heating is mainly carried out by the external PTC 700, which consumes the power battery electric energy in the battery pack 100, converts it into heat energy and then exchanges heat to the thermal management liquid, and the expansion water tank 900 provides the thermal management liquid, which is driven by the water pump 800 connected to the PTC 700 and the expansion water tank 900 to flow into the heat exchange plate of the battery pack 100, and then the heat is transferred to the battery module through heat exchange, thereby achieving the effect of raising the battery temperature, so that the low-temperature charging and discharging performance of the battery is improved, thereby improving the low-temperature driving performance and charging performance of the electric vehicle. Finally, the thermal management liquid flows out of the battery pack 100 , passes through the radiator 1000 , and returns to the expansion water tank 900 .

[0004] However, the PTC heating method has the following problems.

[0005] 1) The use of PTC heating is limited by the size of PTC power. Affected by cost and space, the PTC power is generally around 3-7kW. There will be some path loss in the process of heat transfer by the thermal management fluid. At the same time, the heating of the passenger compartment takes away part of the heating power. The actual heat reaching the battery end is only 50%-75% of the heat generated by the PTC. Therefore, the heating speed is slow and the battery temperature rises slowly, affecting the performance output or charging process.

[0006] 2) When using PTC to heat the battery, the power allocation for heating the passenger compartment is insufficient. In order to ensure the battery charging performance at extremely low temperatures, the heating of the passenger compartment will be reduced or even turned off during the heating process. The passenger compartment is in a low temperature state for a long time, and the driving experience is not good;

[0007] 3) PTC heating can only increase the temperature of the battery system. The temperature of the electric drive oil and components in the electric drive system is still low. The transmission efficiency is low under low-temperature driving conditions. Long-term low-temperature driving puts a heavy load on the transmission system lubrication system, affecting endurance and life.

[0008] To this end, the prior art proposes to use electric drive idling to heat the battery with the heat generated by the electric drive idling. However, the prior art electric drive idling usually uses a constant speed, and does not intentionally control the speed, resulting in low heating efficiency. Summary of the invention

[0009] Based on this, it is necessary to provide an electric vehicle thermal management system, a thermal management method for an electric vehicle thermal management system, an electronic device, a storage medium and a computer program product to address the technical problem that the existing electric drive technology uses a constant speed when idling and the heating efficiency is low.

[0010] The present invention provides an electric vehicle thermal management system, comprising: a battery pack, a motor controller, a drive motor and a control mechanism, wherein the battery pack, the motor controller and the drive motor are electrically connected in sequence, and the motor controller and the drive motor also heat the battery pack through a heat exchange system. The control mechanism is connected to the motor controller and the drive motor, and the control mechanism controls the drive motor to decouple from the vehicle transmission system, and controls the motor controller to control the drive motor to accelerate and decelerate. The heat generated by the motor controller and the drive motor is used to heat the battery pack.

[0011] Furthermore, the heat exchange system includes: a water tank, a first water pump, an oil cooler and an oil pump, the water tank is respectively connected to the input end of the first water pump and the first liquid output end of the battery pack, the output end of the first water pump is connected to the liquid input end of the motor controller, the liquid output end of the motor controller is connected to the liquid input end of the oil cooler, the liquid output end of the oil cooler is connected to the liquid input end of the battery pack, the oil output end of the drive motor is connected to the input end of the oil pump, the output end of the oil pump is connected to the oil input end of the oil cooler, and the oil output end of the oil cooler is connected to the oil input end of the drive motor.

[0012] Furthermore, the heat exchange system also includes: an electric heater, a second water pump, a radiator and a second water tank, the power supply end of the electric heater is electrically connected to the battery pack, the second water tank is connected to the input end of the second water pump, the output end of the second water pump is connected to the liquid input end of the electric heater, the liquid output end of the electric heater is connected to the liquid input end of the battery pack, the second liquid output end of the battery pack is connected to the liquid input end of the radiator, and the liquid output end of the radiator is connected to the second water tank.

[0013] The present invention provides a thermal management method for an electric vehicle thermal management system as described above, comprising:

[0014] In response to a battery heating request, controlling the drive motor to be decoupled from a vehicle transmission system;

[0015] Controlling the driving motor to accelerate and decelerate rotation;

[0016] The heat exchange system is controlled to transfer the heat generated by the motor controller and the drive motor to the battery pack for heating.

[0017] Further, controlling the driving motor to accelerate and decelerate rotation includes:

[0018] The drive motor is controlled to continuously perform multiple acceleration and deceleration rotations, each acceleration and deceleration rotation includes setting the motor controller to a driving mode, controlling the drive motor to accelerate to reach or exceed a preset first speed threshold, and then setting the motor controller to a power generation mode until the drive motor decelerates to reach or fall below a preset second speed threshold, wherein the first speed threshold is higher than the second speed threshold.

[0019] Furthermore, controlling the drive motor to accelerate and decelerate rotation also includes: adjusting the time for the drive motor to accelerate to reach or exceed a preset first speed threshold, and / or adjusting the time for the drive motor to decelerate to reach or fall below a preset second speed threshold.

[0020] Furthermore, controlling the drive motor to accelerate or decelerate rotation further includes: adjusting the first speed threshold and / or the second speed threshold.

[0021] The present invention provides an electronic device, comprising:

[0022] at least one processor; and,

[0023] a memory communicatively connected to at least one of the processors; wherein,

[0024] The memory stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one processor to execute the thermal management method of the thermal management system of an electric vehicle as described above.

[0025] The present invention provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the thermal management method of the electric vehicle thermal management system as described above.

[0026] The present invention provides a computer program product, comprising a computer program / instruction, which implements the thermal management method of the electric vehicle thermal management system as described above when the computer program / instruction is executed by a processor.

[0027] The present invention controls the drive motor to decouple from the vehicle transmission system when heating is required, and controls the motor controller to control the drive motor to accelerate and decelerate, and heats the battery pack through the heat generated by the motor controller and the drive motor. Since the drive motor adopts accelerated and decelerated rotation, the heating power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system schematic diagram of an existing electric vehicle thermal management system;

[0029] Figure 2 This is a system principle diagram of a thermal management system for an electric vehicle according to an embodiment of the present invention;

[0030] Figure 3 This is a working flow chart of a thermal management method of a thermal management system for an electric vehicle according to an embodiment of the present invention;

[0031] Figure 4 This is a working flow chart of a thermal management method of a thermal management system for an electric vehicle according to another embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of energy conversion between the motor controller and the drive motor;

[0033] Figure 6 This is a schematic diagram of the change of the motor controller power and the driving motor speed according to an example of the present invention;

[0034] Figure 7 The figure is a schematic diagram of the hardware structure of an electronic device of the present invention.

[0035] Marking Description

[0036] 1. Battery pack; 2. Motor controller; 3. Drive motor; 4. Water tank; 5. First water pump; 6. Oil cooler; 7. Oil pump; 8. Electric heater; 9. Second water pump; 10. Radiator; 11. Second water tank; 12. Power management module. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0038] like Figure 2 The figure shows a system schematic diagram of a thermal management system for an electric vehicle according to an embodiment of the present invention, comprising: a battery pack 1, a motor controller 2, a drive motor 3 and a control mechanism (not shown in the figure), wherein the battery pack 1, the motor controller 2 and the drive motor 3 are electrically connected in sequence, and the motor controller 2 and the drive motor 3 also heat the battery pack 1 through a heat exchange system, and the control mechanism is connected to the motor controller 2 and the drive motor 3, and the control mechanism controls the drive motor 3 to decouple from the vehicle transmission system, and controls the motor controller 2 to control the drive motor 3 to accelerate and decelerate, and the heat generated by the motor controller 2 and the drive motor 3 is used to heat the battery pack 1.

[0039] Specifically, in some embodiments, the battery pack 1 is electrically connected to the motor controller 2 and the drive motor 3 through the power management module 12. The control mechanism is connected to the motor controller 2 and the drive motor 3. The control mechanism controls the drive motor to be separated and decoupled from the transmission system, so that the drive motor 3 does not serve as an electric vehicle drive unit in a specific mode, and the drive motor 3 can be freely driven to operate and work, and is converted to other purposes other than driving the vehicle.

[0040] In some embodiments, the control mechanism includes a controller and a shift actuator that is communicatively connected to the controller. The shift actuator may be a coupling controller, a two-speed reducer, etc. When the drive motor 3 needs to be decoupled from the transmission system, the controller controls the shift actuator to decouple the drive motor 3 from the vehicle transmission system. The shift actuator can control the disengagement and engagement of the drive motor 3 from the vehicle transmission system. When the drive motor 3 is disengaged from the vehicle transmission system, the drive motor 3 is decoupled from the vehicle transmission system. The vehicle transmission system is a system for driving wheels.

[0041] In some embodiments, the control mechanism includes a vehicle controller, a shift controller, and a shift actuator, the vehicle controller is in communication connection with the shift controller, and the shift controller is in communication connection with the shift actuator. When the drive motor 3 needs to be decoupled from the transmission system, the vehicle controller sends decoupling information to the shift controller, and the shift controller controls the shift actuator to decouple the drive motor 3 from the vehicle transmission system.

[0042] When the drive motor 3 decoupled from the transmission system can be driven freely, the control mechanism controls the drive motor 3 to accelerate or decelerate rotation through the motor controller 2 .

[0043] Specifically, acceleration and deceleration refers to increasing the speed of the drive motor 3 through the motor controller 2, consuming battery power in the process and converting the battery energy into mechanical energy for the motor rotation; in this process, the power conversion is divided into: P total power = P battery discharge + P battery internal resistance power consumption; P battery discharge = P motor controller driving power + P motor controller acceleration process heat + P line loss, where the line loss is extremely small and can be ignored; P motor controller driving power = P motor acceleration process mechanical power + P motor acceleration process electromagnetic heat + P motor acceleration process mechanical loss + P motor acceleration process oil stirring loss. In this process, the short-term electric power will change from 0 to tens of Kw, and the instantaneous large current will increase the battery internal resistance and accelerate the battery heat generation speed; the power change will cause the motor controller 2 and the drive motor 3 to generate heat and mechanical work of the motor.

[0044] When the motor speed is pulled up to a speed close to the set safety target speed, the motor controller 2 is converted from the driving mode to the power generation mode; in this process, the motor mechanical work is consumed, and the mechanical energy is converted into electrical energy to be charged into the battery; in this process, the power conversion is divided into: P charging power = P battery charging + P battery internal resistance power consumption; P battery charging = P motor controller power generation + P motor controller deceleration process heat generation + P line loss, where the line loss is extremely small and can be ignored; P motor controller power generation = P motor deceleration process mechanical power + P motor deceleration process electromagnetic heat + P motor deceleration process mechanical loss + P motor deceleration process oil stirring loss. Therefore, the motor controller 2 and the drive motor 3 will also generate heat.

[0045] The electricity consumed by the drive motor 3 during the driving acceleration and power generation deceleration process will be converted into heat of the motor controller 2 and the drive motor 3 in different forms, and then collected to the battery pack 1 through the heat exchange system.

[0046] By accelerating and decelerating the driving motor 3 , the heating power of the battery pack 1 at low temperatures can be greatly increased.

[0047] The present invention controls the drive motor to decouple from the vehicle transmission system when heating is required, and controls the motor controller to control the drive motor to accelerate and decelerate, and heats the battery pack through the heat generated by the motor controller and the drive motor. Since the drive motor adopts accelerated and decelerated rotation, the heating power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time.

[0048] In one embodiment, the heat exchange system includes: a water tank 4, a first water pump 5, an oil cooler 6 and an oil pump 7, the water tank 4 is respectively connected to the input end of the first water pump 5 and the first liquid output end of the battery pack 1, the output end of the first water pump 5 is connected to the liquid input end of the motor controller 2, the liquid output end of the motor controller 2 is connected to the liquid input end of the oil cooler 6, the liquid output end of the oil cooler 6 is connected to the liquid input end of the battery pack 1, the oil output end of the drive motor 3 is connected to the input end of the oil pump 7, the output end of the oil pump 7 is connected to the oil input end of the oil cooler 6, and the oil output end of the oil cooler 6 is connected to the oil input end of the drive motor 3.

[0049] Specifically, the thermal management liquid can be water. The water tank 4, the first water pump 5, and the oil cooler 6 constitute the first thermal management route. The flow of the thermal management liquid is water tank 4->first water pump 5->motor controller 2->oil cooler 6->battery pack 1->water tank 4. The flow of the thermal management liquid is driven by the first water pump 5, so that the heat generated by the motor controller 2 and the heat of the oil cooler 6 are transferred to the battery pack 1. The oil cooler 6 is connected to the drive motor 3 through the oil pump 7 to form an electric drive oil heat route, which brings out the heat of the drive motor 3 and merges into the first thermal management liquid heat route through the oil cooler 6 to enter the battery pack 1. Specifically, the thermal management liquid of the first thermal management liquid heat route enters the heat exchange plate of the battery pack 1, and then transfers the heat to the battery module of the battery pack 1 through heat exchange.

[0050] The heat exchange system of this embodiment collects the heat of the motor controller and the drive motor into the battery pack.

[0051] In one embodiment, the heat exchange system further includes: an electric heater 8, a second water pump 9, a radiator 10 and a second water tank 11, the power supply end of the electric heater 8 is electrically connected to the battery pack 1, the second water tank 11 is connected to the input end of the second water pump 9, the output end of the second water pump 9 is connected to the liquid input end of the electric heater 8, the liquid output end of the electric heater 8 is connected to the liquid input end of the battery pack 1, the second liquid output end of the battery pack 1 is connected to the liquid input end of the radiator 10, and the liquid output end of the radiator 10 is connected to the second water tank 11.

[0052] Specifically, the electric heater 8 may be a PTC. The electric heater 8, the second water pump 9, the radiator 10, and the second water tank 11 form a second thermal management liquid heat route. The flow of the thermal management liquid is: second water tank 11->second water pump 9->electric heater 8->battery pack 1->radiator 10->second water tank 11. The heat provided by the electric heater 8 is transported to the battery pack 1 through the second thermal management liquid heat route.

[0053] Specifically, the thermal management fluid of the second thermal management fluid heat route enters the heat exchange plate of the battery pack 1 and then transfers the heat to the battery module of the battery pack 1 through heat exchange.

[0054] This embodiment adds an electric heater to supplement the heat provided by the motor controller and the drive motor.

[0055] like Figure 3 The figure shows a working flow chart of a thermal management method of the electric vehicle thermal management system as described above according to an embodiment of the present invention, including:

[0056] Step S301, in response to a battery heating request, controlling the drive motor 3 to be decoupled from the vehicle transmission system;

[0057] Step S302, controlling the driving motor 3 to accelerate and decelerate rotation;

[0058] Step S303 , controlling the heat exchange system to transfer the heat generated by the motor controller 2 and the drive motor 3 to the battery pack 1 for heating.

[0059] Specifically, the present invention can be applied to electronic devices with processing capabilities, such as vehicle controllers. For example, the vehicle's electronic control unit (ECU) and vehicle control unit (VCU). The controller is preferably a vehicle control unit (VCU), and the thermal management method is executed in the vehicle control unit.

[0060] When the battery pack 1 needs to be heated, a battery heating request is generated, triggering step S301 to control the drive motor 3 to be decoupled from the vehicle transmission system.

[0061] Specifically, the power management module 12 may monitor the battery pack 1 , and when the temperature of the battery pack 1 is lower than a temperature threshold and it is determined that the battery pack 1 needs to be heated, a battery heating request is generated to trigger step S301 .

[0062] When executing step S301 , the shift actuator may be controlled to decouple the drive motor 3 from the vehicle transmission system, so that the drive motor 3 can be driven freely.

[0063] Then, step S302 is executed to control the driving motor 3 to accelerate or decelerate.

[0064] Specifically, the motor controller 2 can be used to control the drive motor 3 to accelerate or decelerate its rotation.

[0065] Finally, step S303 is executed to control the heat exchange system to transfer the heat generated by the motor controller 2 and the drive motor 3 to the battery pack 1 for heating.

[0066] Specifically, the heat exchange system includes: a water tank 4, a first water pump 5, an oil cooler 6 and an oil pump 7, the water tank 4 is respectively connected to the input end of the first water pump 5 and the first liquid output end of the battery pack 1, the output end of the first water pump 5 is connected to the liquid input end of the motor controller 2, the liquid output end of the motor controller 2 is connected to the liquid input end of the oil cooler 6, the liquid output end of the oil cooler 6 is connected to the liquid input end of the battery pack 1, the oil output end of the drive motor 3 is connected to the input end of the oil pump 7, the output end of the oil pump 7 is connected to the oil input end of the oil cooler 6, and the oil output end of the oil cooler 6 is connected to the oil input end of the drive motor 3.

[0067] By starting the first water pump 5 , the heat generated by the motor controller 2 and the drive motor 3 is collected and sent to the battery pack 1 , so as to heat the battery pack 1 .

[0068] The present invention controls the drive motor to decouple from the vehicle transmission system when heating is required, and controls the motor controller to control the drive motor to accelerate and decelerate, and heats the battery pack through the heat generated by the motor controller and the drive motor. Since the drive motor adopts accelerated and decelerated rotation, the heating power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time.

[0069] like Figure 4 FIG. 1 is a flowchart of a thermal management method of the electric vehicle thermal management system as described above according to another embodiment of the present invention, comprising:

[0070] Step S401, in response to a battery heating request, controlling the drive motor 3 to be decoupled from the vehicle transmission system;

[0071] Step S402, controlling the drive motor 3 to continuously perform multiple acceleration and deceleration rotations, each acceleration and deceleration rotation includes setting the motor controller 2 to a driving mode, controlling the drive motor 3 to accelerate to or exceed a preset first speed threshold, and then setting the motor controller 2 to a power generation mode until the drive motor 3 decelerates to or below a preset second speed threshold, wherein the first speed threshold is higher than the second speed threshold;

[0072] Step S403 , controlling the heat exchange system to transfer the heat generated by the motor controller 2 and the drive motor 3 to the battery pack 1 for heating.

[0073] Specifically, when the battery pack 1 needs to be heated, a battery heating request is generated, triggering step S401 to control the drive motor 3 to be decoupled from the vehicle transmission system.

[0074] After the drive motor 3 is decoupled from the vehicle transmission system, step S402 is executed to control the drive motor 3 to perform multiple acceleration and deceleration rotations continuously, each acceleration and deceleration rotation includes setting the motor controller 2 to a driving mode, controlling the drive motor 3 to accelerate to or exceed a preset first speed threshold, and then setting the motor controller 2 to a power generation mode until the drive motor 3 decelerates to reach or fall below a preset second speed threshold, wherein the first speed threshold is higher than the second speed threshold.

[0075] Specifically, Figure 5 As shown, the motor controller 2 increases the speed of the drive motor 3, and in this process, the battery power is consumed, and the battery energy is converted into mechanical energy for the motor rotation; in this process, the power conversion is divided into: P total power = P battery discharge + P battery internal resistance power consumption; P battery discharge = P motor controller driving power + P motor controller acceleration process heat + P line loss, where the line loss is extremely small and can be ignored; P motor controller driving power = P motor acceleration process mechanical power + P motor acceleration process electromagnetic heat + P motor acceleration process mechanical loss + P motor acceleration process oil stirring loss. In this process, the short-term electric power will change from 0 to tens of Kw, and the instantaneous large current will increase the internal resistance of the battery and accelerate the battery heat generation speed; the power change will cause the motor controller 2 and the drive motor 3 to generate heat and mechanical work of the motor. Among them, Ptotal power is the total power, Pbattery discharge is the battery discharge power, Pbattery internal resistance power consumption is the battery internal resistance power consumption, Pmotor controller driving power is the motor controller driving power, Pmotor controller acceleration process heat generation is the motor controller heating process heat generation power, Pline loss is the line loss power, Pmotor acceleration process mechanical power is the motor mechanical power, Pmotor acceleration process electromagnetic heat generation is the motor electromagnetic heat generation power, Pmotor acceleration process mechanical loss is the motor mechanical loss power, Pmotor acceleration process oil stirring loss is the motor oil stirring power.

[0076] When the motor speed is pulled up to a speed close to the set safety target speed, the motor controller 2 is converted from the driving mode to the power generation mode; in this process, the motor mechanical work is consumed, and the mechanical energy is converted into electrical energy to be charged into the battery; in this process, the power conversion is divided into: P charging power = P battery charging + P battery internal resistance power consumption; P battery charging = P motor controller power generation + P motor controller deceleration process heat generation + P line loss, where the line loss is extremely small and can be ignored; P motor controller power generation = P motor deceleration process mechanical power + P motor deceleration process electromagnetic heat + P motor deceleration process mechanical loss + P motor deceleration process oil stirring loss. Therefore, the motor controller 2 and the drive motor 3 will also generate heat. Among them, P charging power is the charging power, P battery charging is the battery charging power, P battery internal resistance power consumption is the battery internal resistance power consumption, P motor controller power generation is the motor controller power generation, P motor controller deceleration process heat generation is the click controller heat power, P line loss is the line loss heat power, P motor deceleration process mechanical power is the motor mechanical power, P motor deceleration process electromagnetic heat generation is the motor electromagnetic heat generation power, P motor deceleration process mechanical loss is the motor mechanical loss power, P motor deceleration process oil stirring loss is the motor deceleration process oil stirring loss power.

[0077] The electricity consumed by the drive motor 3 during the driving acceleration and power generation deceleration process will be converted into heat of the motor controller 2 and the drive motor 3 in different forms, and then collected to the battery pack 1 through the heat exchange system.

[0078] By accelerating and decelerating the driving motor 3 , the heating power of the battery pack 1 at low temperatures can be greatly increased.

[0079] Finally, step S403 is executed to control the heat exchange system to transfer the heat generated by the motor controller 2 and the drive motor 3 to the battery pack 1 for heating.

[0080] This embodiment controls the drive motor to decouple from the vehicle transmission system when heating is required, and controls the motor controller to control the drive motor to perform motor drive acceleration and power generation deceleration processes, and heats the battery pack through the heat generated by the motor controller and the drive motor. Since the drive motor uses acceleration and deceleration rotation, the heating power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time.

[0081] In one embodiment, controlling the drive motor 3 to accelerate and decelerate rotation also includes: adjusting the time for the drive motor 3 to accelerate to reach or exceed a preset first speed threshold, and / or adjusting the time for the drive motor 3 to decelerate to reach or fall below a preset second speed threshold.

[0082] Specifically, the time for the drive motor 3 to accelerate to or exceed a preset first speed threshold value and / or the time for the drive motor 3 to decelerate to or below a preset second speed threshold value can be adjusted according to demand. Figure 6 As shown, in the rapid acceleration and deceleration section 62, the time for the drive motor 3 to accelerate to or exceed the preset first speed threshold and the time for the drive motor 3 to decelerate to or below the preset second speed threshold are both much shorter than the initial operation section 61 and the power adjustable section 63.

[0083] By reducing the time for the drive motor 3 to accelerate to or exceed the preset first speed threshold and reducing the time for the drive motor 3 to decelerate to or below the preset second speed threshold, the heat generation of the drive motor 3 and the motor controller 2 can be increased. Increasing the time for the drive motor 3 to accelerate to or exceed the preset first speed threshold and reducing the time for the drive motor 3 to decelerate to or below the preset second speed threshold will reduce the heat generation of the drive motor 3 and the motor controller 2.

[0084] Among them, reducing the time for the drive motor 3 to accelerate to or exceed the preset first speed threshold value means controlling the drive motor 3 to rotate quickly, and reducing the time for the drive motor 3 to decelerate to or below the preset second speed threshold value means controlling the drive motor 3 to generate electricity quickly, and increasing the time for the drive motor 3 to accelerate to or exceed the preset first speed threshold value means controlling the drive motor 3 to rotate slowly, and reducing the time for the drive motor 3 to decelerate to or below the preset second speed threshold value means controlling the drive motor 3 to generate electricity slowly.

[0085] During the acceleration phase, the motor controller 2 consumes electricity, and during the deceleration process, the motor controller 2 generates electricity. The faster the acceleration, the greater the power consumption, and the heat generation power of the motor controller during the acceleration process and the electromagnetic heat generation power of the motor during the acceleration process increase. The faster the deceleration, the greater the power generation power, and the heat generation power of the motor controller during the deceleration process and the electromagnetic heat generation power of the motor during the deceleration process increase. Therefore, in the rapid acceleration and deceleration section 62, the power consumption and power generation power of the motor controller 2 are greater than those in the other two stages, thereby increasing the heat generation.

[0086] This embodiment adjusts the heat generation of the motor controller and the drive motor by adjusting the time for the drive motor to accelerate to reach or exceed a preset first speed threshold, and / or adjusting the time for the drive motor to decelerate to reach or fall below a preset second speed threshold.

[0087] In one of the embodiments, controlling the driving motor 3 to accelerate or decelerate rotation further includes: adjusting the first speed threshold and / or the second speed threshold.

[0088] Specifically, the heating power may be determined according to the heating demand, and then the first rotation speed threshold and / or the second rotation speed threshold may be determined according to the heating power.

[0089] The heat generated by the motor and the motor controller is reduced by reducing the first speed threshold and / or increasing the second motor speed threshold while lengthening the time to reach the corresponding speed range; the heat generated by the motor and the motor controller is increased by increasing the first speed threshold and / or reducing the second motor speed threshold while shortening the time to reach the corresponding speed range.

[0090] In this embodiment, the heat generated by the motor and the motor controller is changed by adjusting the first speed threshold and / or the second speed threshold.

[0091] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0092] like Figure 7 The figure shows a hardware structure diagram of an electronic device of the present invention, including:

[0093] at least one processor 701; and,

[0094] A memory 702 that is communicatively connected to at least one of the processors 701; wherein,

[0095] The memory 702 stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors so that the at least one processor can execute the thermal management method of the thermal management system of the electric vehicle as described above.

[0096] Figure 7 A processor 701 is taken as an example.

[0097] The electronic device may further include: an input device 703 and a display device 704 .

[0098] The processor 701, the memory 702, the input device 703 and the display device 704 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0099] The memory 702 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the thermal management method of the electric vehicle thermal management system in the embodiment of the present application, for example, Figure 3 , Figure 4 The processor 701 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 702, that is, the thermal management method of the electric vehicle thermal management system in the above embodiment is implemented.

[0100] The memory 702 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created according to the use of the thermal management method of the electric vehicle thermal management system, etc. In addition, the memory 702 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 702 may optionally include a memory remotely arranged relative to the processor 701, and these remote memories may be connected to a device for executing the thermal management method of the electric vehicle thermal management system via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0101] The input device 703 can receive user clicks and generate signal inputs related to user settings and function control of the thermal management method of the electric vehicle thermal management system. The display device 704 can include display devices such as a display screen.

[0102] The one or more modules are stored in the memory 702 , and when executed by the one or more processors 701 , the thermal management method of the electric vehicle thermal management system in any of the above method embodiments is executed.

[0103] The present invention controls the drive motor to decouple from the vehicle transmission system when heating is required, and controls the motor controller to control the drive motor to accelerate and decelerate, and heats the battery pack through the heat generated by the motor controller and the drive motor. Since the drive motor adopts accelerated and decelerated rotation, the heating power of the motor controller and the drive motor is relatively high, so the heating power at low temperatures can be greatly improved. At the same time, since the drive motor itself generates heat, the temperature of the electric drive oil and components in the electric drive system can also be increased at the same time.

[0104] An embodiment of the present invention provides a storage medium, wherein the storage medium stores computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the thermal management method of the electric vehicle thermal management system as described above.

[0105] In the context of the present disclosure, a storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-temporary computer-readable storage medium, for example, a non-temporary computer-readable storage medium may be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0106] An embodiment of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the thermal management method of the electric vehicle thermal management system as described above.

[0107] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. 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, which 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 vehicle, characterized in that: include: A battery pack (1), a motor controller (2), a drive motor (3), and a control mechanism, wherein the battery pack (1), the motor controller (2), and the drive motor (3) are electrically connected in sequence, the motor controller (2) and the drive motor (3) also heat the battery pack (1) through a heat exchange system, the control mechanism is connected to the motor controller (2) and the drive motor (3), the control mechanism controls the drive motor (3) to decouple from a vehicle transmission system, and controls the motor controller (2) to control the drive motor (3) to accelerate and decelerate rotation, the heat generated by the motor controller (2) and the drive motor (3) is used to heat the battery pack (1), and the control mechanism controls the drive motor (3) to accelerate and decelerate rotation, comprising: Controlling the drive motor (3) to continuously perform multiple acceleration and deceleration rotations, each acceleration and deceleration rotation comprising setting the motor controller (2) to a driving mode, controlling the drive motor (3) to accelerate to reach or exceed a preset first speed threshold, and then setting the motor controller (2) to a power generation mode until the drive motor (3) decelerates to reach or fall below a preset second speed threshold, the first speed threshold being higher than the second speed threshold; The heat exchange system comprises: a water tank (4), a first water pump (5), an oil cooler (6) and an oil pump (7); the water tank (4) is respectively connected to an input end of the first water pump (5) and a first liquid output end of the battery pack (1); the output end of the first water pump (5) is connected to a liquid input end of the motor controller (2); the liquid output end of the motor controller (2) is connected to a liquid input end of the oil cooler (6); the liquid output end of the oil cooler (6) is connected to a liquid input end of the battery pack (1); the oil output end of the drive motor (3) is connected to an input end of the oil pump (7); the output end of the oil pump (7) is connected to an oil input end of the oil cooler (6); and the oil output end of the oil cooler (6) is connected to an oil input end of the drive motor (3).

2. The electric vehicle thermal management system according to claim 1, characterized in that: The heat exchange system further comprises: an electric heater (8), a second water pump (9), a radiator (10) and a second water tank (11); a power supply end of the electric heater (8) is electrically connected to the battery pack (1); the second water tank (11) is connected to an input end of the second water pump (9); an output end of the second water pump (9) is connected to a liquid input end of the electric heater (8); a liquid output end of the electric heater (8) is connected to a liquid input end of the battery pack (1); a second liquid output end of the battery pack (1) is connected to a liquid input end of the radiator (10); and a liquid output end of the radiator (10) is connected to the second water tank (11).

3. A thermal management method for an electric vehicle thermal management system according to any one of claims 1 to 2, characterized in that: include: In response to a battery heating request, controlling the drive motor (3) to be decoupled from the vehicle transmission system; Controlling the drive motor (3) to accelerate and decelerate rotation; The heat exchange system is controlled to transfer the heat generated by the motor controller (2) and the drive motor (3) to the battery pack (1) for heating.

4. The thermal management method of the electric vehicle thermal management system according to claim 3, characterized in that: The controlling the drive motor (3) to accelerate or decelerate rotation further comprises: adjusting the time for the drive motor (3) to accelerate to or exceed a preset first rotation speed threshold and / or adjusting the time for the drive motor (3) to decelerate to or below a preset second rotation speed threshold.

5. The thermal management method of the electric vehicle thermal management system according to claim 3, characterized in that: The controlling the drive motor (3) to accelerate or decelerate rotation further comprises: adjusting the first rotation speed threshold and / or the second rotation speed threshold.

6. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors to enable at least one of the processors to execute the thermal management method of the electric vehicle thermal management system as described in any one of claims 3 to 5.

7. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the thermal management method of the electric vehicle thermal management system as described in any one of claims 3 to 5.

8. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the thermal management method of the electric vehicle thermal management system as claimed in any one of claims 3 to 5 is implemented.

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