Motor controller power device thermal management system based on endothermic reaction heat dissipation and working method

Abstract

The invention provides a motor controller power device thermal management system based on endothermic reaction heat dissipation, which comprises an isopropanol storage tank, a liquid level indicator I is arranged in the isopropanol storage tank I and is connected with a comparator, a liquid level indicator II is arranged in the isopropanol storage tank II and is connected with the comparator, and the liquid level indicator I is connected with the comparator. The comparator is also respectively connected with an electric pump II and an electric pump III, the isopropanol liquid storage tank I is connected with the isopropanol liquid storage tank II through two pipelines, the electric pump II is mounted on one pipeline, and the electric pump III is mounted on the other pipeline. According to the invention, power device waste heat-chemical energy-heat energy-electric energy is used as a core conversion mechanism, and a complete energy gradient utilization cycle is constructed while heat dissipation of a power density device is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal management of new energy vehicles, and in particular relates to a thermal management system and a working method for power devices of a motor controller based on endothermic reaction heat dissipation. Background Art

[0002] High power density demand: In the electric drive system of new energy vehicles, the power density of the motor controller power device IGBT (insulated gate bipolar transistor) has exceeded 500W / cm 2 , the operating temperature must be controlled below 150℃, otherwise the device life will be shortened (the life is halved for every 10℃ above the rated temperature).

[0003] Limitations of traditional cooling: Air / liquid cooling, whose efficiency depends on environmental conditions (such as vehicle speed and temperature), cannot recover waste heat, and the cooling system consumes approximately 15% of the power consumed by the IGBTs in the motor controller. Phase change material (PCM) provides only passive heat storage, cannot handle prolonged high-load conditions (such as continuous hill climbing), and lacks energy recovery.

[0004] Existing patents, such as CN112324736A or US10539773B2, use a methanol / formaldehyde, ammonia, and hydrogen system. Methanol is a neurotoxin, formaldehyde is carcinogenic, and ammonia is prone to leakage and has a wide explosion limit (15-28 vol%), making it unsuitable for the personnel safety requirements of an onboard environment.

[0005] Some chemical heat pumps are designed for high-temperature industrial waste heat. For example, US10539773B2 requires a heat source above 300°C and cannot directly adapt to the low-temperature waste heat of the motor controller power device IGBT. Additional energy boosting steps are required, which increases the system complexity.

[0006] Most studies use traditional Raney nickel or precious metal catalysts (such as Pt / Ru). The former's activity decreases significantly at low temperatures (for example, the dehydrogenation rate of traditional Raney nickel at 348K is 46% lower than that of the rapid quenching type, "Applied Thermal Engineering, 2014"). The latter is expensive (Pt price > $30,000 / kg), making it difficult to apply on a large scale. Summary of the Invention

[0007] The purpose of the present invention is to solve the defects of the above-mentioned prior art and provide a motor controller power device thermal management system and working method based on endothermic reaction heat dissipation. Through "chemical heat pump + Rankine cycle + thermal management synergy", energy upgrade across temperature zones is achieved, from low-grade waste heat → high-grade thermal energy → electrical energy, breaking through the limitations of single thermal management.

[0008] Adaptable to all operating conditions: Covering the cooling and heating needs of devices such as batteries, motors, electronic controls, and seat heating, the system combines waste heat recovery with active cooling to ensure efficient and safe equipment operation, significantly improves the comprehensive energy utilization rate, and provides an integrated "storage-use-control" solution for thermal management of power electronic equipment.

[0009] The system utilizes an isopropyl alcohol / acetone / hydrogen system (isopropyl alcohol has a low toxicity rating of 5000 mg / kg; acetone has an explosive limit of 2.5-13 vol%, making it safer than methanol / formaldehyde), meeting the safety requirements of onboard environments. The system precisely adapts the medium and low-temperature heat sources, allowing the acetone dehydrogenation reaction temperature to directly match the waste heat from the IGBT power devices in the motor controller, eliminating the need for additional energy boost. The high-temperature heat released by the hydrogenation reaction meets the high-temperature requirements of the Rankine cycle, eliminating the reliance of traditional chemical heat pumps on high-temperature heat sources (e.g., ammonia decomposition requires temperatures above 300°C).

[0010] The present invention adopts the following technical solutions: A thermal management system for power devices in a motor controller based on heat dissipation through an endothermic reaction comprises an isopropyl alcohol storage tank, wherein a liquid level indicator I is installed in the isopropyl alcohol storage tank I and is connected to a comparator, and a liquid level indicator II is installed in the isopropyl alcohol storage tank II and is connected to the comparator. The comparator is also connected to an electric pump II and an electric pump III, respectively. The isopropyl alcohol storage tank I and the isopropyl alcohol storage tank II are connected by two pipes, one of which is equipped with the electric pump II, and the other is equipped with the electric pump III. Isopropyl alcohol storage tank I has two output pipes named as pipe A and pipe B, and one input pipe named as pipe C. Pipe A is sequentially installed with centrifugal pump II, flow controller II and flow meter II. Pipe B is sequentially installed with centrifugal pump I, flow controller I, flow meter I and isopropyl alcohol dehydrogenation endothermic reaction chamber. The heat required for the isopropyl alcohol dehydrogenation reaction comes from the heat generated by the motor controller power device IGBT. Pipe C is sequentially installed with flow meter III and electric pump I. The other ends of pipes A, B and C are all connected to heat exchanger I.

[0011] Furthermore, the isopropyl alcohol dehydrogenation endothermic reaction chamber is connected to a ring liquid vacuum pump.

[0012] Furthermore, the heat exchanger I is connected to the diverter I, the diverter I is connected to the isopropyl alcohol collection tank, the isopropyl alcohol collection tank is connected to the isopropyl alcohol storage tank II, the diverter I is connected to the condenser, the condenser is connected to the heat pump, and the heat pump outputs heat to heat the seat.

[0013] Furthermore, the condenser is connected to the heat exchange cavity of the motor through a pipe I, and the solenoid valve I is installed on the pipe I. The heat exchange cavity of the motor is connected to the heat pump through a pipe K, and the solenoid valve II is installed on the pipe K.

[0014] The heat pump is connected to the refrigerator, and the refrigerator is connected to the heat exchange cavity of the battery.

[0015] Furthermore, the condenser is connected to splitter II via pipe H. Splitter II is connected to an acetone collection tank and a hydrogen collection tank via two pipes, respectively. The acetone collection tank is connected to a reboiler via pipe O, and the hydrogen collection tank is connected to the reboiler via pipe P. A flow controller III is installed on pipe O, and a flow controller IV is installed on pipe P. The reboiler is connected to a compressor, which is connected to heat exchanger II. Heat exchanger II is connected to the acetone hydrogenation exothermic reaction chamber, which is connected to heat exchanger II. Heat exchanger II is connected to heat exchanger III, which is connected to splitter I. Heat exchanger III outputs heat for Rankine cycle power generation. This Rankine cycle power generation will charge a battery, whose heat exchange chamber is connected to the condenser.

[0016] A method for operating a thermal management system for a motor controller power device based on endothermic reaction heat dissipation includes: Step 1. After the isopropyl alcohol in the isopropyl alcohol storage tank I passes through the centrifugal pump I, the flow controller I, and the flow meter I, a dehydrogenation reaction occurs in the isopropyl alcohol dehydrogenation endothermic reaction chamber. The heat generated by the IGBT power device of the motor controller is used to carry out the reaction, and the heat energy is stored. Step 2. The isopropyl alcohol in isopropyl alcohol storage tank I passes through pipeline A and is heated in heat exchanger I by the mixture of reactants and products at the outlet of the isopropyl alcohol dehydrogenation reaction chamber at a higher temperature. After heating, the isopropyl alcohol is returned to isopropyl alcohol storage tank I through pipeline C. Step 3. After passing through heat exchanger I, the acetone vapor and hydrogen gas flow through a condenser and into an acetone collection tank and a hydrogen collection tank, respectively. The mixture is then mixed by adjusting the molar ratio using a flow control. The mixture is heated in a reboiler and pressure-dropped by a compressor. A hydrogenation reaction then occurs in the acetone hydrogenation exothermic reaction chamber, releasing high-temperature heat. Step 4. The released heat is used to heat the reaction products, acetone and hydrogen, through heat exchanger II to promote continued reaction. Isopropyl alcohol and unreacted acetone enter heat exchanger III. Because acetone has a lower boiling point than isopropyl alcohol, the hot isopropyl alcohol is first cooled to a liquid state, separated from the acetone, and returned to pipeline D. The heat exchanged in heat exchanger III is used to drive the Rankine cycle for power generation. Step 5. The isopropyl alcohol cooled to a liquid phase in the reaction product of step 1 and the isopropyl alcohol cooled to a liquid phase in step 4 are returned to the isopropyl alcohol collection tank after passing through splitter I, and finally returned to the liquid storage tank II.

[0017] Furthermore, a liquid ring vacuum pump is provided on the isopropyl alcohol dehydrogenation endothermic reaction chamber for rapidly removing generated gaseous products, reducing pressure, promoting the conversion of acetone dissolved in the liquid phase to the gas phase, and reducing the acetone concentration in the liquid phase isopropyl alcohol, thereby breaking through the chemical equilibrium limit, increasing the isopropyl alcohol conversion rate, and promoting the occurrence of the reaction.

[0018] Furthermore, the cooled reaction products are cooled by the condenser and the battery coolant, and enter the heat exchange cavity of the motor to replace the cooling medium that has not been fully heat exchanged, thereby achieving refrigeration.

[0019] Furthermore, when there is a large load or the temperature demand does not match, the solenoid valves on both sides of the motor are closed, and the reaction products exchange heat with the battery coolant in the condenser to preheat the battery.

[0020] Furthermore, when the battery needs to be cooled, the heat pump is started to recover the temperature of the battery coolant and heat the seats at the same time.

[0021] Furthermore, when the battery needs to be heated up, the heat pump is started and the battery coolant is used to remove the seat temperature.

[0022] Furthermore, when the battery temperature rises to a level that is difficult to control, the refrigerator is also started at the same time to lower the temperature of the battery coolant.

[0023] Beneficial effects of the present invention: (1) The replacement of low-toxic reaction systems improves safety and temperature compatibility. The isopropyl alcohol / acetone / hydrogen system (isopropyl alcohol LD50 = 5000mg / kg, low toxicity; acetone explosion limit 2.5-13%, safer than methanol / formaldehyde) is adopted to meet the personnel safety requirements of the vehicle environment.

[0024] (2) The dehydrogenation reaction temperature directly matches the IGBT waste heat, without the need for additional energy boost. The hydrogenation reaction releases high-temperature heat, which is adapted to the high-temperature requirements of the Rankine cycle and avoids the dependence of traditional chemical heat pumps on high-temperature heat sources (such as ammonia decomposition requires above 300°C).

[0025] (3) Through the “chemical heat pump + Rankine cycle + thermal management synergy”, energy upgrade across temperature zones is achieved, low-grade waste heat → high-grade thermal energy → electrical energy, breaking through the limitations of single thermal management.

[0026] (4) Adaptability to all operating conditions: covers the cooling and heating requirements of electronic control, battery / motor, as well as the cooling and heating requirements of electronic control and seat heating. Combining waste heat recovery with active cooling ensures efficient and safe operation of the equipment.

[0027] (5) Significantly improved the comprehensive energy utilization rate and provided an integrated “storage-use-control” solution for thermal management of power electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention; In the figure: 1-electric pump I, 2-electric pump II, 3-flow meter III, 4-comparator, 5-isopropyl alcohol storage tank II, 6-liquid level indicator II, 7-electric pump III, 8-isopropyl alcohol storage tank I, 9-liquid level indicator I, 10-centrifugal pump I, 11-flow controller I, 12-flow meter I, 13-isopropyl alcohol dehydrogenation endothermic reaction chamber, 14-liquid ring vacuum pump, 15-heat exchanger I, 16-centrifugal pump II, 17-flow controller II, 18-flow meter II, 19 -Splitter I, 20-Condenser, 21-Solenoid Valve I, 22-Motor, 23-Solenoid Valve II, 24-Heat Exchanger III, 25-Acetone Hydrogenation Exothermic Reaction Chamber, 26-Heat Exchanger II, 27-Compressor, 28-Reboiler, 29-Flow Controller III, 30-Flow Controller IV, 31-Acetone Collection Tank, 32-Hydrogen Collection Tank, 33-Splitter II, 34-Isopropanol Collection Tank, 35-Battery, 36-Seat Heating, 37-Heat Pump, 38-Refrigerator. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] Technical principle: Heat absorption section (IGBT heat dissipation): Utilizes IGBT waste heat to drive the liquid-phase dehydrogenation reaction of isopropyl alcohol to generate acetone and hydrogen, storing chemical energy.

[0031] Exothermic section (energy recovery): Acetone and hydrogen react at high temperature to release heat to drive the Rankine cycle to generate electricity.

[0032] Key coupling: Through gas-liquid separation, hydrogen storage module and catalyst optimization, the full process closed loop of "dehydrogenation-hydrogenation-condensation reflux" is realized.

[0033] The low-toxic, medium- and low-temperature compatible isopropyl alcohol / acetone system is selected to replace the traditional high-risk chemical heat pump system (such as methanol / formaldehyde).

[0034] Catalyst: Rapidly quenched Raney nickel (amorphous alloy) increases low-temperature activity by 46%, and a SiO2 coating layer provides resistance to oil poisoning (activity retention >95% at 50ppm oil).

[0035] This system is equipped with two liquid storage tanks, one for real-time raw material supply and the other for liquid level control via a liquid level indicator, serving as a recovery container for the circulating isopropyl alcohol.

[0036] like Figure 1 As shown, a thermal management system for power devices of a motor controller based on endothermic reaction heat dissipation of the present invention includes an electric pump, a flow meter, a comparator 4, an isopropyl alcohol storage tank, a liquid level indicator, a centrifugal pump, a flow controller, an isopropyl alcohol dehydrogenation endothermic reaction chamber 13, a liquid ring vacuum pump 14, a heat exchanger, a diverter, a condenser 20, a solenoid valve, a motor 22, an acetone hydrogenation exothermic reaction chamber 25, a compressor 27, a reboiler 28, an acetone collection tank 31, a hydrogen collection tank 32, an isopropyl alcohol collection tank 34, a battery 35, a seat heater 36, a heat pump 37, and a refrigerator 38.

[0037] A liquid level indicator I9 is ​​installed in the isopropyl alcohol storage tank I8, and the liquid level indicator I9 is ​​connected to the comparator 4. A liquid level indicator II6 is installed in the isopropyl alcohol storage tank II5, and the liquid level indicator 2 is connected to the comparator 4. The comparator 4 is also connected to the electric pump II6 and the electric pump III7 respectively. The isopropyl alcohol storage tank I and the isopropyl alcohol storage tank II are connected by two pipes, one of which is equipped with an electric pump II2 and the other is equipped with an electric pump III7.

[0038] Isopropyl alcohol storage tank I8 has two output pipes, designated Pipeline A and Pipeline B, and one input pipe, designated Pipeline C. Pipeline A is sequentially equipped with a centrifugal pump II 16, a flow controller II 17, and a flow meter II 18. Pipeline B is sequentially equipped with a centrifugal pump I 10, a flow controller I 11, a flow meter 12, and an endothermic isopropyl alcohol dehydrogenation reaction chamber 13. The heat required for the isopropyl alcohol dehydrogenation reaction comes from the IGBT. This endothermic isopropyl alcohol dehydrogenation reaction chamber 13 is equipped with a liquid-circulating vacuum pump 14. Pipeline C is sequentially equipped with a flow meter III 3 and an electric pump I 1. The other ends of Pipelines A, B, and C are all connected to a heat exchanger I 15.

[0039] Isopropyl alcohol storage tank I8, with the help of electronic equipment such as centrifugal pumps (centrifugal pump I10, centrifugal pump II16), flow controllers (flow controller I11, flow controller II17), etc., automatically controls the flow rate according to the actual temperature operating conditions of the motor controller power device IGBT, so that isopropyl alcohol of a suitable flow rate participates in the dehydrogenation reaction. The waste heat of the motor controller power device IGBT is absorbed by the isopropyl alcohol, driving the dehydrogenation reaction to generate acetone and hydrogen. The thermal energy is stored in the form of chemical energy, and the temperature of the motor controller power device IGBT is controlled to be within the optimal operating range.

[0040] At the outlet of the endothermic isopropyl alcohol dehydrogenation reaction chamber 13, a liquid ring vacuum pump 14 is installed to rapidly extract the gaseous acetone vapor and hydrogen, breaking the chemical equilibrium limit of the "dehydrogenation reaction" and driving the reaction toward the formation of acetone and hydrogen, thereby increasing the chemical heat storage limit. After the reaction, the mixture of reactants and products at the outlet, which has a higher temperature, is preheated by heat exchanger I 15 in the liquid in isopropyl alcohol storage tank I 8, raising the initial temperature of the raw materials and promoting the rapid endothermic reaction in the heat dissipation reaction chamber of the motor controller power device IGBT. Simultaneously, the heat-exchanged mixture passes through splitter I 19, separating the isopropyl alcohol into isopropyl alcohol collection tank 34 and then returning to isopropyl alcohol storage tank II 5.

[0041] The heat exchanger I15 is connected to the diverter I19 through a pipe D, the diverter 19 is connected to the isopropyl alcohol collection tank 34 through a pipe E, the isopropyl alcohol collection tank 34 is connected to the isopropyl alcohol storage tank II5 through a pipe F, the diverter 19 is connected to the condenser 20 through a pipe G, the condenser 20 is connected to the diverter II33 through a pipe H, and the condenser 20 is also connected to the heat exchange cavity of the motor 22 through a pipe I. In addition, the condenser 20 is connected to the heat pump 37 through a pipe J, the solenoid valve I21 is installed on the pipe I, the heat exchange cavity of the motor 22 is connected to the heat pump 37 through a pipe K, the solenoid valve II23 is installed on the pipe K, the heat pump 37 outputs heat to the seat heater 36 through a pipe L, the heat pump 37 is connected to the refrigerator 38 through a pipe M, and the refrigerator 38 is connected to the heat exchange cavity of the battery 35 through a pipe N.

[0042] The cooling part is controlled by the series connection of the condenser 20 and the battery coolant. When the load is small, the solenoid valve (solenoid valve I 21 and solenoid valve II 23) is opened, and the liquid cooling medium that has not been fully heat-exchanged in the heat exchange cavity of the motor 22 is used to assist the battery thermal management and cooling, or preheat the battery when the temperature is appropriate. When the load is large or the temperature demand does not match, the solenoid valve (solenoid valve I 21 and solenoid valve II 23) is closed to isolate the motor 22, replace its heat separately, and maintain the motor 22 at a suitable working temperature, thereby achieving thermal coordination of multiple components.

[0043] At the same time, when the battery needs to be cooled, the heat pump 37 can be started to recover waste heat and assist the seat heating 36. When the temperature needs to be increased, the heat of the seat can also be taken away to heat the battery 35. If the temperature rises and is difficult to control, the refrigerator 38 can be activated at the same time to quickly cool down and ensure that the battery 35 is always at the ideal working temperature.

[0044] Splitter II 33 is connected to the acetone collection tank 31 and the hydrogen collection tank 32 via two pipes, respectively. The acetone collection tank 31 is connected to the reboiler 28 via pipe O, and the hydrogen collection tank 32 is connected to the reboiler 28 via pipe P. A flow controller III 29 is installed on pipe O, and a flow controller IV 30 is installed on pipe P. Reboiler 28 is connected to compressor 27 via pipe Q, which is connected to heat exchanger II 26 via pipe R. Heat exchanger II 26 is connected to the acetone hydrogenation exothermic reaction chamber 25 via pipe S, which is in turn connected to heat exchanger II 26 via pipe T. Heat exchanger II 26 is connected to heat exchanger III 24 via pipe U, which is connected to splitter I 19 via pipe V. Heat exchanger III 24 outputs heat via pipe W for Rankine cycle power generation. This Rankine cycle power generation will charge battery 35, whose heat exchange chamber is connected to condenser 20 via pipe X.

[0045] Acetone vapor and hydrogen flow through condenser 20 into acetone collection tank 31 and hydrogen collection tank 32, respectively. Flow controllers (flow controller III 29 and flow controller IV 30) then mix the mixture at the optimal reaction molar ratio before entering the highly exothermic acetone hydrogenation reaction zone. After being heated in reboiler 28 (compressor 27 compensates for pressure drop), the mixed reactants undergo a hydrogenation reaction in acetone hydrogenation exothermic reaction chamber 25, releasing a high level of heat (chemical energy is converted back into thermal energy, completing the cross-temperature zone upgrade).

[0046] The high-temperature heat passes through heat exchanger II 26 and heat exchanger III 24, and is used to heat the reaction products (to ensure the reaction proceeds spontaneously and smoothly) and drive the Rankine cycle to generate electricity (to achieve electrical energy output) to charge the battery.

[0047] The mixture of the reactants and products after heat exchange enters the splitter I 19, and the liquid isopropyl alcohol returns to the isopropyl alcohol collection tank 34 and finally flows into the isopropyl alcohol storage tank II 5.

[0048] At the same time, the present invention also provides a working method of a thermal management system for a motor controller power device based on endothermic reaction heat dissipation, comprising: Step 1. After the isopropyl alcohol in the isopropyl alcohol storage tank Ⅰ8 passes through the centrifugal pump Ⅰ10, the flow controller Ⅰ11, and the flow meter Ⅰ12, a dehydrogenation reaction occurs in the isopropyl alcohol dehydrogenation endothermic reaction chamber 13. The heat generated by the motor controller power device IGBT is used to carry out the reaction, and the heat energy is stored; Step 2. The isopropyl alcohol in the isopropyl alcohol storage tank I8 passes through pipeline A and is heated in the heat exchanger I15 by the mixture of reactants and products at the outlet of the isopropyl alcohol dehydrogenation reaction chamber 13 at a higher temperature. After heating, the mixture returns to the isopropyl alcohol storage tank I8 through pipeline C. Step 3. After passing through heat exchanger I 15, the acetone vapor and hydrogen gas flow through condenser 20 and into acetone collection tank 31 and hydrogen collection tank 32, respectively. The mixture is then adjusted to an optimal molar ratio through flow control. The mixture is heated in reboiler 28 and pressure drop is compensated in compressor 27. A hydrogenation reaction then occurs in acetone hydrogenation exothermic reaction chamber 25, releasing high-temperature heat. Step 4. The released heat is used to heat the reaction products, acetone and hydrogen, through heat exchanger II 26 to promote continued reaction. Isopropyl alcohol and unreacted acetone enter heat exchanger III 24. Because acetone has a lower boiling point than isopropyl alcohol, the hot isopropyl alcohol is first cooled to a liquid state to separate from the acetone and return to pipeline D. The heat exchanged in heat exchanger III is used to drive the Rankine cycle for power generation, thereby ensuring that the circulating isopropyl alcohol is always at a high concentration. Step 5. The isopropyl alcohol cooled to a liquid phase in the reaction product of step 1 and the isopropyl alcohol cooled to a liquid phase in step 4 are returned to the isopropyl alcohol collection tank after passing through splitter I, and finally returned to the liquid storage tank II.

[0049] Furthermore, a liquid ring vacuum pump is provided on the isopropyl alcohol dehydrogenation endothermic reaction chamber for rapidly removing generated gaseous products, reducing pressure, promoting conversion of acetone dissolved in the liquid phase to the gas phase, and reducing the acetone concentration in the liquid phase isopropyl alcohol, thereby breaking through the chemical equilibrium limit and improving the isopropyl alcohol conversion rate.

[0050] Furthermore, the cooled reaction products are cooled by the condenser and the battery coolant, and enter the heat exchange cavity of the motor to replace the cooling medium that has not been fully heat exchanged, thereby achieving refrigeration.

[0051] Furthermore, when there is a large load or the temperature demand does not match, the solenoid valves on both sides of the motor are closed, and the reaction products exchange heat with the battery coolant in the condenser to preheat the battery.

[0052] Furthermore, when the battery needs to be cooled, the heat pump 37 is started to recover the temperature of the battery coolant and heat the seat 36 at the same time.

[0053] Furthermore, when the battery needs to be heated up, the heat pump 37 is started to remove the seat temperature using the battery coolant.

[0054] Furthermore, when the battery temperature rises to a level that is difficult to control, the refrigerator 38 is also started to reduce the temperature of the battery coolant.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A thermal management system for power devices of a motor controller based on endothermic reaction heat dissipation, characterized in that: The invention comprises an isopropyl alcohol storage tank, wherein a liquid level indicator I is installed in the isopropyl alcohol storage tank I, and the liquid level indicator I is connected to a comparator; a liquid level indicator II is installed in the isopropyl alcohol storage tank II, and the liquid level indicator is connected to the comparator; the comparator is also connected to an electric pump II and an electric pump III respectively; the isopropyl alcohol storage tank I and the isopropyl alcohol storage tank II are connected by two pipes, one of which is equipped with the electric pump II, and the other is equipped with the electric pump III; Isopropyl alcohol storage tank I has two output pipes named as pipe A and pipe B, and one input pipe named as pipe C. Pipe A is sequentially installed with centrifugal pump II, flow controller II and flow meter II. Pipe B is sequentially installed with centrifugal pump I, flow controller I, flow meter I and isopropyl alcohol dehydrogenation endothermic reaction chamber. The heat required for the isopropyl alcohol dehydrogenation reaction comes from the heat generated by the motor controller power device IGBT. Pipe C is sequentially installed with flow meter III and electric pump I. The other ends of pipes A, B and C are all connected to heat exchanger I.

2. The system according to claim 1, wherein: The isopropyl alcohol dehydrogenation endothermic reaction chamber is connected to a ring liquid vacuum pump.

3. The system according to claim 1, wherein: Heat exchanger I is connected to diverter I, diverter I is connected to the isopropyl alcohol collection tank, the isopropyl alcohol collection tank is connected to the isopropyl alcohol storage tank II, diverter I is connected to the condenser, the condenser is connected to the heat pump, the heat pump outputs heat to heat the seat, the condenser is also connected to the heat exchange cavity of the motor through pipe I, solenoid valve I is installed on pipe I, the heat exchange cavity of the motor is connected to the heat pump through pipe K, solenoid valve II is installed on pipe K, the heat pump is connected to the refrigerator, and the refrigerator is connected to the heat exchange cavity of the battery.

4. The system according to claim 1, wherein: The condenser is connected to the splitter II through a pipe H. The splitter II is connected to the acetone collecting tank and the hydrogen collecting tank through two pipes respectively. The acetone collecting tank is connected to the reboiler through a pipe O. The hydrogen collecting tank is connected to the reboiler through a pipe P. A flow controller III is installed on the pipe O. A flow controller IV is installed on the pipe P. The reboiler is connected to the compressor. The compressor is connected to the heat exchanger II. The heat exchanger II is connected to the acetone hydrogenation exothermic reaction chamber. The acetone hydrogenation exothermic reaction chamber is connected to the heat exchanger II. The heat exchanger II is connected to the heat exchanger III. The heat exchanger III is connected to the splitter I. The heat exchanger III outputs heat for Rankine cycle power generation. The Rankine cycle power generation will charge the battery. The heat exchange chamber of the battery is connected to the condenser.

5. A method for operating a thermal management system for a motor controller power device based on endothermic reaction heat dissipation, characterized in that: include: Step 1. After the isopropyl alcohol in the isopropyl alcohol storage tank I passes through the centrifugal pump I, the flow controller I, and the flow meter I, a dehydrogenation reaction occurs in the isopropyl alcohol dehydrogenation endothermic reaction chamber. Heat generated by the IGBT power device of the motor controller is used to advance the reaction, and the heat energy is stored. A liquid ring vacuum pump is provided in the isopropyl alcohol dehydrogenation endothermic reaction chamber to quickly remove the generated gaseous products, reduce the pressure, and promote the reaction. Step 2. The isopropyl alcohol in isopropyl alcohol storage tank I passes through pipeline A and is heated in heat exchanger I by the mixture of reactants and products at the outlet of the isopropyl alcohol dehydrogenation reaction chamber at a higher temperature. After heating, the isopropyl alcohol is returned to isopropyl alcohol storage tank I through pipeline C. Step 3. After passing through heat exchanger I, the acetone vapor and hydrogen gas flow through a condenser and into an acetone collection tank and a hydrogen collection tank, respectively. The mixed molar ratio is then adjusted using flow control. The mixture is heated in a reboiler and pressure drop is compensated for by a compressor. A hydrogenation reaction then occurs in the acetone hydrogenation exothermic reaction chamber, releasing high-temperature heat. Step 4. The released heat is used to heat the reaction products, acetone and hydrogen, through heat exchanger II to promote continued reaction. Isopropyl alcohol and unreacted acetone enter heat exchanger III. Because acetone has a lower boiling point than isopropyl alcohol, the hot isopropyl alcohol is first cooled to a liquid state, separated from the acetone, and returned to pipeline D. The heat exchanged in heat exchanger III is used to drive the Rankine cycle for power generation. Step 5. The isopropyl alcohol cooled to a liquid phase in the reaction product of step 1 and the isopropyl alcohol cooled to a liquid phase in step 4 are returned to the isopropyl alcohol collection tank after passing through splitter I, and finally returned to the liquid storage tank II.

6. The method according to claim 5, characterized in that The cooled reaction products are cooled by the condenser and the battery coolant, and then enter the heat exchange cavity of the motor to replace the cooling medium that has not been fully heat exchanged, thereby achieving refrigeration.

7. The method according to claim 5, characterized in that When there is a large load or the temperature demand does not match, the solenoid valves on both sides of the motor are closed, and the reaction products exchange heat with the battery coolant in the condenser to preheat the battery.

8. The method according to claim 5, characterized in that When the battery needs to be cooled, the heat pump is started to recover the temperature of the battery coolant and heat the seats at the same time.

9. The method according to claim 5, characterized in that When the battery needs to be heated up, the heat pump is started and the battery coolant is used to remove the seat temperature.

10. The method according to claim 5, characterized in that When the battery temperature rises to the limit temperature, the cooler is also started at the same time to reduce the temperature of the battery coolant.

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