A new energy vehicle thermal management system using heat storage regulation and control method thereof

Abstract

The present invention discloses a new energy vehicle thermal management system using heat storage regulation and a control method thereof. The system includes: a first solenoid valve, a second solenoid valve, a third solenoid valve, a circulating pump, a first working fluid pipeline, a heater, a second working fluid pipeline, a fourth solenoid valve, a fan, a first temperature sensor, an engine, a second temperature sensor, a motor, a third temperature sensor, a power battery pack, a phase change energy storage box, a pedal position sensor and a control module. The present invention makes full use of the energy storage characteristics and high heat capacity characteristics of phase change materials, and can quickly take away heat in the peak heat load state of the power system to achieve heat load peak shaving. The device structure of the present invention is simple and compact, and there is no need to significantly modify the original thermal management system. The device can be directly connected to the original thermal management system, which can avoid the redundant design of the original thermal management system caused by coping with short-term extremely high peak heat loads, and reduce the mass and volume of the original thermal management system.

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 for new energy vehicles using heat storage regulation and a control method thereof. Background Art

[0002] Effective thermal regulation is the key to reducing thermal runaway of new energy vehicles and promoting safe operation. The increase in power density of new energy vehicles has caused a sharp increase in peak thermal load. In order to cope with this extremely high peak thermal load in a short period of time, the vehicle thermal management system usually adopts a redundant design to ensure the stability and safety of the system.

[0003] Phase change energy storage materials have excellent heat storage capacity due to their high heat capacity. They can absorb and release a large amount of phase change energy to achieve the purpose of regulating temperature and have broad application prospects. Rational use of phase change energy storage materials, design of heat storage regulation systems with simple operation, low cost and high thermal conductivity, and application in thermal management of new energy vehicles are technical problems that relevant personnel in this field need to solve.

[0004] At present, the combination of phase change materials and battery thermal management is often used to ensure that the battery is at a safe temperature to extend battery life, ensure high-efficiency performance, and avoid thermal runaway of the battery. However, there are few technical solutions that combine phase change materials with the thermal management system of the whole vehicle. The small number of technical solutions that apply phase change energy storage materials to the thermal management system of the whole vehicle also have the following shortcomings or deficiencies: ① It does not take into account the current increase in the power density of new energy vehicles, which causes a sharp increase in peak thermal load. In order to cope with the redundant design of the thermal management system caused by short-term extremely high peak thermal loads, the high thermal capacity of phase change energy storage materials can be used to achieve thermal load peak shaving and reduce the mass and volume of the thermal management system. ② In cold environments, there is no technical solution for the efficient use of cooling, heating, and heat storage for phase change energy storage in new energy vehicles. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and provides the following solutions:

[0006] A new energy vehicle thermal management system using heat storage regulation, comprising: a first solenoid valve, a second solenoid valve, a third solenoid valve, a circulating pump, a first working fluid pipeline, a heater, a second working fluid pipeline, a fourth solenoid valve, a fan, a first temperature sensor, an engine, a second temperature sensor, a motor, a third temperature sensor, a power battery pack, a phase change energy storage box, a pedal position sensor and a control module;

[0007] The first solenoid valve, the second solenoid valve, the third solenoid valve and the circulation pump are all arranged on the first working medium pipeline, and the fourth solenoid valve and the fan are arranged on the second working medium pipeline;

[0008] The first working fluid pipeline and the second working fluid pipeline both pass through the heater, and the heater is arranged in the phase change energy storage box;

[0009] The first working medium pipeline forms three branch pipelines at the engine, the motor and the power battery pack respectively, and the branch pipelines are evenly distributed in the heat concentration area;

[0010] The first temperature sensor is arranged on the engine, the second temperature sensor is arranged on the electric motor, the third temperature sensor is arranged on the power battery pack, and the pedal position sensor is arranged on the pedal;

[0011] The first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump, the heater, the fourth solenoid valve, the fan, the first temperature sensor, the engine, the second temperature sensor, the motor, and the third temperature sensor are electrically connected to the control module respectively;

[0012] The motor is electrically connected to the heater.

[0013] Preferably, the material of the first working fluid pipeline and the second working fluid pipeline is copper;

[0014] The interior of the first working medium pipeline is filled with a liquid working medium with good thermal conductivity;

[0015] The interior of the second working medium pipeline is not filled with working medium, and is an air circulation pipeline.

[0016] Preferably, the box body material of the phase change energy storage box is a heat insulating material, and the interior of the phase change energy storage box is filled with a flexible solid-liquid phase change material.

[0017] The present invention also provides a control method for a new energy vehicle thermal management system using heat storage regulation, the control method is used to control the thermal management system described in any of the above items, including: vehicle cold start condition control, vehicle normal operation stage control, peak heat load condition control and parking condition control.

[0018] Preferably, the vehicle cold start condition control includes:

[0019] The control module controls the third solenoid valve, the circulation pump, the heater and the motor to be turned on, and the circulation pump enables the first working fluid pipeline to form a loop;

[0020] The control module controls the engine to start, and drives the motor to run in reverse through the engine, and the heater is powered by the motor running in reverse, and the heater heats the flexible solid-liquid phase change material in the phase change energy storage box;

[0021] The circulating pump drives the liquid working medium in the first working medium pipeline to flow, absorbs heat in the phase change energy storage box, and releases heat at the power battery pack;

[0022] The third temperature sensor collects the temperature signal T of the power battery pack in real time 3 , and transmit the temperature signal to the control module to set the first target temperature T of the power battery pack 0 , when the temperature signal T 3 The first target temperature T 0 When the control module controls the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the fan to be closed.

[0023] Preferably, the vehicle normal operation stage control includes:

[0024] The control module controls the fourth solenoid valve and the fan to be turned on, and controls the first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump and the heater to be turned off;

[0025] The fan forms a loop with the second working medium pipeline, and cools the cold air through the second working medium pipeline to store the cold energy in the flexible solid-liquid phase change material in the phase change energy storage box;

[0026] The upper limit of the normal operating temperature of the engine T is set in the control module. m1 and the normal operating temperature of the engine T n1 , and T m1 >T n1 When the control module receives the temperature signal T fed back by the first temperature sensor 1 >T m1 When the temperature signal T 1 <T n1 ;

[0027] The upper limit of the normal operating temperature of the motor T is set in the control module. m2 and the normal operating temperature of the motor T n2 , and T m2 >T n2 When the control module receives the temperature signal T fed back by the second temperature sensor 2 >T m2 When the temperature signal T 2 <T n2 ;

[0028] The upper limit of the normal operating temperature of the power battery pack is set in the control module. m3 And the normal operating temperature of the power battery pack T n3 , and T m3 >T n3 When the control module receives the temperature signal T fed back by the third temperature sensor 3 >T m3 When the temperature signal T 3 <T n3 .

[0029] Preferably, the peak heat load condition control includes:

[0030] When the temperature signal T collected in the control module 1 >T m1 , the temperature signal T 2 >T m2 and the temperature signal T 3 >T m3 If at least one of the above is true, and the pedal movement stroke collected by the pedal position sensor is greater than 90% of the maximum movement stroke, it is determined that the vehicle has reached a peak thermal load state;

[0031] When the vehicle reaches the peak heat load state, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump, the fourth solenoid valve and the fan to open, and enables the circulation pump and the fan to operate at maximum power;

[0032] When the pedal movement stroke collected by the pedal position sensor is less than 75% of the maximum movement stroke, it is determined that the vehicle is not in the peak heat load state, and the control module controls the heater to be turned off.

[0033] Preferably, the parking condition control includes:

[0034] Set the second target temperature T for waste heat recovery to stop operation r When the vehicle stops running, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve and the circulation pump to open, so that the first working fluid pipeline forms a loop, and controls the heater, the fourth solenoid valve and the fan to close;

[0035] The circulating pump allows the liquid working medium to flow in the first working medium pipeline, absorbs waste heat at the engine, the motor and the power battery pack, releases heat in the phase change energy storage box, and stores heat in the flexible solid-liquid phase change material until the temperature signal T 1 The second target temperature Tr .

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention makes full use of the energy storage characteristics and high heat capacity characteristics of phase change materials, and can quickly remove heat in the peak heat load state of the power system to achieve heat load peak reduction. The device structure of the present invention is simple and compact, and there is no need to significantly modify the original thermal management system. The device can be directly connected to the original thermal management system, which can avoid the redundant design of the original thermal management system caused by the short-term extremely high peak heat load, and reduce the mass and volume of the original thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 A schematic diagram of the system structure of an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of phase change material distribution according to an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. First solenoid valve; 2. Second solenoid valve; 3. Third solenoid valve; 4. Circulation pump; 5. First working fluid pipeline; 6. Heater; 7. Second working fluid pipeline; 8. Fourth solenoid valve; 9. Fan; 10. First temperature sensor; 11. Engine; 12. Second temperature sensor; 13. Motor; 14. Third temperature sensor; 15. Power battery pack; 16. Phase change energy storage box; 17. Pedal position sensor. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Embodiment 1

[0046] In this embodiment, if Figure 1 , Figure 2 As shown, a new energy vehicle thermal management system using heat storage regulation includes: a first solenoid valve 1, a second solenoid valve 2, a third solenoid valve 3, a circulating pump 4, a first working fluid pipeline 5, a heater 6, a second working fluid pipeline 7, a fourth solenoid valve 8, a fan 9, a first temperature sensor 10, an engine 11, a second temperature sensor 12, a motor 13, a third temperature sensor 14, a power battery pack 15, a phase change energy storage box 16, a pedal position sensor 17 and a control module.

[0047] The first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3 and the circulation pump 4 are all arranged on the first working medium pipeline 5, and the fourth solenoid valve 8 and the fan 9 are arranged on the second working medium pipeline 7. The material of the first working medium pipeline 5 and the second working medium pipeline 7 is copper, and the interior of the first working medium pipeline 5 is filled with liquid working medium with good thermal conductivity, and the interior of the second working medium pipeline 7 is not filled with working medium, and is an air circulation pipeline.

[0048] The first working fluid pipeline 5 and the second working fluid pipeline 7 both pass through the heater 6, and the heater 6 is arranged in the phase change energy storage box 16. The box material of the phase change energy storage box 16 is a heat insulation material, and the interior of the phase change energy storage box 16 is filled with a flexible solid-liquid phase change material.

[0049] The first working medium pipeline 5 forms three branch pipelines at the engine 11, the motor 13 and the power battery pack 15, and the branch pipelines are evenly distributed in the heat concentration area. The motor 13 is electrically connected to the heater 6, and the motor 13 can be operated in both positive and negative working conditions, and can be used as a motor 13 and a generator.

[0050] The first temperature sensor 10 is disposed on the engine 11 and is used to collect the temperature of the engine 11 and generate a temperature signal T 1 The second temperature sensor 12 is disposed on the motor 13 for collecting the temperature of the motor 13 and generating a temperature signal T 2 The third temperature sensor 14 is disposed on the power battery pack 15 and is used to collect the temperature of the power battery pack 15 and generate a temperature signal T 3 ; The pedal position sensor 17 is arranged on the pedal to collect the movement stroke of the pedal.

[0051] The first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, the circulation pump 4, the heater 6, the fourth solenoid valve 8, the fan 9, the first temperature sensor 10, the engine 11, the second temperature sensor 12, the motor 13, and the third temperature sensor 14 are electrically connected to the control module respectively.

[0052] Embodiment 2

[0053] In this embodiment, a control method for a new energy vehicle thermal management system using heat storage regulation is provided, including: vehicle cold start condition control, vehicle normal operation stage control, peak heat load condition control and parking condition control.

[0054] The vehicle cold start condition control includes: the control module controls the third solenoid valve 3, the circulation pump 4, the heater 6 and the motor 13 to be turned on, and the circulation pump 4 forms a loop for the first working fluid pipeline 5; the control module controls the engine 11 to start, and drives the motor 13 to run in the reverse direction through the engine 11, and supplies power to the heater 6 through the reverse running motor 13, and the heater 6 heats the flexible solid-liquid phase change material in the phase change energy storage box 16; the circulation pump 4 drives the liquid working fluid in the first working fluid pipeline 5 to flow, absorbs heat in the phase change energy storage box 16, and releases heat at the power battery pack 15; the third temperature sensor 14 collects the temperature signal T of the power battery pack 15 in real time 3 , and transmit the temperature signal to the control module. When the temperature signal T 3 is the first target temperature T 0 When T 0 It is usually set to around 10℃.

[0055] The control of the normal operation stage of the vehicle includes: the control module controls the fourth solenoid valve 8 and the fan 9 to open, and controls the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, the circulation pump 4 and the heater 6 to close; the fan 9 forms a loop with the second working fluid pipeline 7, and the cold air passes through the second working fluid pipeline 7 to store the cold energy in the flexible solid-liquid phase change material in the phase change energy storage box 16; the control module sets the upper limit of the normal operating temperature T of the engine m1 and the normal operating temperature of the engine T n1 , and T m1 >T n1 When the control module receives the temperature signal T fed back by the first temperature sensor 10 1 >T m1 When the temperature signal T 1 <T n1 ; Set the upper limit of the normal operating temperature T of the motor in the control module m2 and the normal operating temperature of the motor T n2 , and T m2 >T n2 When the control module receives the temperature signal T fed back by the second temperature sensor 12 2 >T m2 When the temperature signal T 2 <T n2; Set the upper limit of normal operating temperature T of the power battery pack in the control module m3 And the normal operating temperature of the power battery pack T n3 , and T m3 >T n3 When the control module receives the temperature signal T fed back by the third temperature sensor 14 3 >T m3 When the temperature signal T 3 <T n3 .

[0056] Furthermore, in this embodiment, T m1 Generally 95~105℃, T n1 Generally, it is 80~90℃. In order to avoid frequent switching of the control system, T m1 The value must be at least greater than T n1 Value more than 10℃; T m2 Generally 50~60℃, T n2 Generally, it is 40~50℃. In order to avoid frequent switching of the control system, T m2 The value must be at least greater than T n2 Value more than 10℃; T m3 Generally 35~40℃, T n3 Generally, it is 20-25℃. In order to avoid frequent switching of the control system, T m3 The value must be at least greater than T n3 The value is 10℃ higher.

[0057] Peak heat load condition control includes: when the temperature signal T collected in the control module 1 >T m1 , temperature signal T 2 >T m2 and temperature signal T 3 >T m3 If at least one of the following is true, and the pedal movement stroke collected by the pedal position sensor 17 is greater than 90% of the maximum movement stroke, it is determined that the vehicle has reached a peak thermal load state; when the vehicle reaches a peak thermal load state, the control module controls the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, the circulation pump 4, the fourth solenoid valve 8 and the fan 9 to open, and the circulation pump 4 and the fan 9 to operate at maximum power; when the pedal movement stroke collected by the pedal position sensor 17 is less than 75% of the maximum movement stroke, it is determined that the vehicle is not in a peak thermal load state, and the control module controls the heater 6 to turn off.

[0058] The parking condition control includes: setting the second target temperature T of the waste heat recovery stop operation r In this embodiment, T rGenerally, it is set to about 20℃. When the vehicle stops running, the control module controls the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3 and the circulation pump 4 to open, so that the first working fluid pipeline 5 forms a loop, and controls the heater 6, the fourth solenoid valve 8 and the fan 9 to close; the circulation pump 4 allows the liquid working fluid to flow in the first working fluid pipeline 5, absorbs waste heat at the engine 11, the motor 13 and the power battery pack 15, and releases heat in the phase change energy storage box 16, and stores the heat in the flexible solid-liquid phase change material until the temperature signal T 1 <Second target temperature T r , that is, the engine temperature drops to T r After the temperature drops below 0.05, stop the waste heat recovery.

[0059] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A new energy vehicle thermal management system using heat storage regulation, characterized in that: include: A first solenoid valve, a second solenoid valve, a third solenoid valve, a circulating pump, a first working fluid pipeline, a heater, a second working fluid pipeline, a fourth solenoid valve, a fan, a first temperature sensor, an engine, a second temperature sensor, a motor, a third temperature sensor, a power battery pack, a phase change energy storage box, a pedal position sensor and a control module; The first solenoid valve, the second solenoid valve, the third solenoid valve and the circulation pump are all arranged on the first working medium pipeline, and the fourth solenoid valve and the fan are arranged on the second working medium pipeline; The first working fluid pipeline and the second working fluid pipeline both pass through the heater, and the heater is arranged in the phase change energy storage box; The first working medium pipeline forms three branch pipelines at the engine, the motor and the power battery pack respectively, and the branch pipelines are evenly distributed in the heat concentration area; The first temperature sensor is arranged on the engine, the second temperature sensor is arranged on the electric motor, the third temperature sensor is arranged on the power battery pack, and the pedal position sensor is arranged on the pedal; The first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump, the heater, the fourth solenoid valve, the fan, the first temperature sensor, the engine, the second temperature sensor, the motor, and the third temperature sensor are electrically connected to the control module respectively; The motor is electrically connected to the heater.

2. A new energy vehicle thermal management system using heat storage regulation according to claim 1, characterized in that: The material of the first working fluid pipeline and the second working fluid pipeline is copper; The interior of the first working medium pipeline is filled with a liquid working medium with good thermal conductivity; The interior of the second working medium pipeline is not filled with working medium, and is an air circulation pipeline.

3. According to claim 1, a new energy vehicle thermal management system using heat storage regulation is characterized in that: The box body material of the phase change energy storage box is a heat insulation material, and the interior of the phase change energy storage box is filled with a flexible solid-liquid phase change material.

4. A control method for a thermal management system of a new energy vehicle using heat storage regulation, the control method being used to control the thermal management system according to any one of claims 1 to 3, characterized in that: include: Vehicle cold start condition control, vehicle normal operation stage control, peak thermal load condition control and parking condition control.

5. According to claim 4, a control method for a new energy vehicle thermal management system using heat storage regulation is characterized in that: The vehicle cold start condition control includes: The control module controls the third solenoid valve, the circulation pump, the heater and the motor to be turned on, and the circulation pump enables the first working fluid pipeline to form a loop; The control module controls the engine to start, and drives the motor to run in reverse through the engine, and the heater is powered by the motor running in reverse, and the heater heats the flexible solid-liquid phase change material in the phase change energy storage box; The circulating pump drives the liquid working medium in the first working medium pipeline to flow, absorbs heat in the phase change energy storage box, and releases heat at the power battery pack; The third temperature sensor collects the temperature signal T3 of the power battery pack in real time, and transmits the temperature signal to the control module to set the first target temperature T0 of the power battery pack. When the temperature signal T3 is the first target temperature T0, the control module controls the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the fan to be closed.

6. According to claim 4, a control method for a new energy vehicle thermal management system using heat storage regulation is characterized in that: The vehicle normal operation stage control includes: The control module controls the fourth solenoid valve and the fan to be turned on, and controls the first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump and the heater to be turned off; The fan forms a loop with the second working medium pipeline, and cools the cold air through the second working medium pipeline to store the cold energy in the flexible solid-liquid phase change material in the phase change energy storage box; The upper limit of the normal operating temperature of the engine T is set in the control module. m1 and the normal operating temperature of the engine T n1 , and T m1 >T n1 When the control module receives the temperature signal T1>T fed back by the first temperature sensor m1 When the temperature signal T1 is less than T n1 ; The upper limit of the normal operating temperature of the motor T is set in the control module. m2 and the normal operating temperature of the motor T n2 , and T m2 >T n2 When the control module receives the temperature signal T2>T fed back by the second temperature sensor m2 When the temperature signal T2 is less than T n2 ; The upper limit of the normal operating temperature of the power battery pack is set in the control module. m3 And the normal operating temperature of the power battery pack T n3 , and T m3 >T n3 When the control module receives the temperature signal T3>T fed back by the third temperature sensor m3 When the temperature signal T3 is less than T n3 .

7. A control method for a new energy vehicle thermal management system using heat storage regulation according to claim 6, characterized in that: The peak heat load condition control includes: When the temperature signal T1 collected by the control module is greater than T m1 , the temperature signal T2>T m2 and the temperature signal T3>T m3 If at least one of the above is true, and the pedal movement stroke collected by the pedal position sensor is greater than 90% of the maximum movement stroke, it is determined that the vehicle has reached a peak thermal load state; When the vehicle reaches the peak heat load state, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve, the circulation pump, the fourth solenoid valve and the fan to open, and enables the circulation pump and the fan to operate at maximum power; When the pedal movement stroke collected by the pedal position sensor is less than 75% of the maximum movement stroke, it is determined that the vehicle is not in the peak heat load state, and the control module controls the heater to be turned off.

8. The control method of a new energy vehicle thermal management system using heat storage regulation according to claim 6 is characterized in that: The parking condition control includes: Set the second target temperature T at which the waste heat recovery stops running r When the vehicle stops running, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve and the circulation pump to open, so that the first working fluid pipeline forms a loop, and controls the heater, the fourth solenoid valve and the fan to close; The circulating pump allows the liquid working medium to flow in the first working medium pipeline, absorbs waste heat at the engine, the motor and the power battery pack, releases heat in the phase change energy storage box, and stores heat in the flexible solid-liquid phase change material until the temperature signal T1 is less than the second target temperature T r .

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