Temperature control method for battery power automobile

Abstract

The invention discloses a battery power automobile temperature control method which is characterized in that two sets of air conditioner heat exchange systems sharing one compressor are adopted to independently control the temperature of an automobile compartment and a battery pack, and the temperature of the battery pack is detected in real time in the control process; when the temperature of the battery pack is lower than the battery low-temperature early-warning threshold value, a heat exchanger close to the battery pack is controlled to be converted into a condenser and supply heat to the battery pack, and when the temperature of the battery pack is higher than the battery high-temperature early-warning threshold value, the heat exchanger is controlled to be converted into an evaporator and supply cold to the battery pack. The temperature control requirements of the compartment and the battery can be better met, the cold and heat utilization efficiency is better improved, and more energy and consumption are saved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery electric vehicles, and in particular to a battery electric vehicle temperature control method. BACKGROUND

[0002] A battery electric vehicle, referred to as an electric vehicle, is a vehicle that uses a vehicle-mounted power supply as power, drives wheels by using an electric motor, and meets the requirements of road traffic and safety regulations. The electric vehicle is the most widely used new energy vehicle type at present. The electric vehicle uses electric power as the driving force, has the advantages of low energy consumption, fast effect, no emission, and does not need to rely on traditional energy, and is the mainstream direction of future automobile development. With the intensification of global climate change and the depletion of fossil energy, the low-carbon transformation of the transportation field has become a strategic focus of each country. The electric vehicle (including a hybrid electric vehicle) is widely regarded as a key solution to replace traditional fuel vehicles due to its zero-emission characteristics. However, the large-scale promotion of the electric vehicle still faces multiple technical challenges, and the performance of the thermal management system is directly related to the safety, energy efficiency and user experience of the vehicle, and becomes a core link that needs to be broken through.

[0003] As the core power source of the electric vehicle, the performance and service life of the lithium ion battery are highly dependent on the temperature environment. Research shows that the optimal working temperature range of the battery is 25-40°C, and the temperature difference between the battery modules needs to be strictly controlled within 5°C. Exceeding this range not only causes the capacity of the battery to decay rapidly, but also significantly increases the risk of thermal runaway, and in extreme cases, may cause a fire and other safety accidents. Therefore, the vehicle-mounted air conditioner used in the existing thermal management system of the electric vehicle not only bears the function of adjusting the temperature in the vehicle cabin of the traditional air conditioning system, but also needs to participate in the battery thermal management to reduce the energy consumption of the whole vehicle, prolong the cruising range and prolong the service life of the battery. It not only maintains a comfortable temperature environment in the vehicle, but also controls and protects the temperature of the power battery.

[0004] The current mainstream thermal management system of the electric vehicle adopts a split design, and the vehicle cabin air conditioner and the battery heat exchange circuit operate independently, resulting in redundant system structure and low energy utilization efficiency. In some electric vehicles, a secondary heat exchange circuit connected with the battery pack is arranged on the basis of the vehicle cabin air conditioning system, and the cold energy of the evaporator or the heat energy of the condenser in the air conditioning system is input into the battery pack as needed to achieve temperature control. This mode also has the problem of mismatch between the single heat source / cold source supply mode and the differentiated thermal demands of the battery, the vehicle cabin and other components. At the same time, since the heat exchangers of the vehicle cabin air conditioner are located at different positions from the battery pack, a large amount of energy is wasted during the secondary output flow of the cold and heat energy, resulting in low energy utilization efficiency. SUMMARY

[0005] In view of the above problems of the prior art, the technical problem to be solved by the present application is how to provide a battery-powered vehicle temperature control method which can better meet the respective temperature control requirements of the vehicle cabin and the battery, better improve the cold and heat utilization efficiency, and save energy and reduce consumption.

[0006] To solve the above technical problem, the present application adopts the following technical solution: A battery-powered vehicle temperature control method, characterized in that two sets of air conditioning heat exchange systems sharing one compressor are used to independently control the temperature of the vehicle cabin and the battery pack, and in the control process, the temperature of the battery pack is detected in real time, when the temperature of the battery pack is lower than the low-temperature early warning threshold of the battery, a heat exchanger arranged close to the battery pack is controlled to be converted into a condenser and to supply heat to the battery pack, and when the temperature of the battery pack is higher than the high-temperature early warning threshold of the battery, the heat exchanger is controlled to be converted into an evaporator and to supply cold to the battery pack.

[0007] In this way, the vehicle cabin and the battery pack each use a set of air conditioning heat exchange systems to achieve independent control, which can better meet the respective temperature control requirements of the vehicle cabin and the battery. Two sets of air conditioning systems share one compressor, which better saves equipment costs. Among them, a single heat exchanger arranged close to the battery pack is used to supply heat or cold to the battery pack when needed to achieve battery temperature control, avoiding the loss of cold and heat during flow, and better improving the cold and heat utilization efficiency. Therefore, it has the characteristics of better energy saving and consumption reduction.

[0008] Further, the method is realized by relying on an electric vehicle cabin and battery temperature control system, the electric vehicle cabin and battery temperature control system comprises a cabin vehicle outside heat exchanger installed on the outside of the vehicle body and a cabin vehicle inside heat exchanger installed in the cabin, a cabin expansion valve is arranged in series at one end between the cabin vehicle outside heat exchanger and the cabin vehicle inside heat exchanger, and the other end is connected to a compressor by using a reversible adjustment circuit and constitutes a cabin heat exchange control circuit capable of realizing reverse conversion control as a whole, wherein, a battery vehicle outside heat exchanger installed on the outside of the vehicle body and a battery vehicle inside heat exchanger installed at the position of the battery pack are further included, a battery expansion valve is arranged in series at one end between the battery vehicle outside heat exchanger and the battery vehicle inside heat exchanger, and the other end is connected to the reversible adjustment circuit and constitutes a battery heat exchange control circuit capable of realizing reverse conversion control as a whole; the battery vehicle inside heat exchanger further comprises a second flow channel, the second flow channel of the battery vehicle inside heat exchanger is connected to a battery heat exchange circulating pipeline, a battery heat exchange pump is installed on the battery heat exchange circulating pipeline, and the battery heat exchange pump flows through the battery pack to realize heat exchange.

[0009] Thus, in the present application, on the basis of the existing vehicle cabin heat exchange control circuit air conditioning system, a semi-independent battery heat exchange control circuit is designed, which can supply cold or heat from outside the vehicle to the battery vehicle interior heat exchanger and release it to the battery pack according to the needs, realizing the heating or cooling function of the battery pack. In this way, since the battery vehicle interior heat exchanger is directly installed at the location of the battery pack and both cooling and heating for the battery are directly realized through the battery vehicle interior heat exchanger, when the battery heat exchange pump is opened to realize the temperature regulation of the battery through the battery vehicle interior heat exchanger and the battery heat exchange, the heat or cold of the battery vehicle interior heat exchanger is directly supplied to the battery pack through the second flow channel and the battery heat exchange circulating pipeline, avoiding the energy loss caused by the long-distance secondary flow of heat or cold in the delivery process. At the same time, the independence of the battery heat exchange control circuit makes the temperature regulation of the battery by the battery vehicle interior heat exchanger not affected by the vehicle cabin interior heat exchanger (i.e. they can operate simultaneously in cooling and heating). In addition, since the battery heat exchange control circuit and the vehicle cabin heat exchange control circuit are coupled through the reversible regulation circuit, they can share a compressor to realize air conditioning cooling (or heating), and the compressor is a core component of the air conditioning system with high cost. Therefore, this way not only saves the cost of the device by sharing the compressor, but also can realize the flow distribution of the heat exchange medium in the battery heat exchange control circuit and the vehicle cabin heat exchange control circuit through the reversible regulation circuit; for example, when the weather temperature is moderate and the temperature control and regulation demand in the vehicle cabin is low, more heat exchange medium can be delivered to the battery heat exchange control circuit, better ensuring the temperature control demand of the battery.

[0010] Further, the reversible adjustment circuit comprises a first tee joint installed on a pipe connected to one end of the vehicle cabin heat exchanger, the pipe is connected to a sixth switch valve, a second tee joint, a fourth switch valve, a third tee joint, the vehicle cabin heat exchanger and a vehicle cabin expansion valve in sequence, and then connected to the other end of the vehicle cabin heat exchanger; a third port of the first tee joint is connected to a fourth tee joint through a pipe installed with an eighth switch valve, and then connected to a third port of a fifth tee joint, a third port of the second tee joint is connected to a first inlet of a mixing device through a pipe; a pipe connected to one end of the battery heat exchanger is connected to a sixth tee joint and a fifth switch valve in sequence, and then connected to a second inlet of the mixing device; a third port of the sixth tee joint is connected to a third port of the fourth tee joint through a pipe connected with a seventh switch valve; an outlet of the mixing device is connected to the compressor, and then connected to a first port of the fifth tee joint; a second port of the fifth tee joint is connected to a second port of a four-way joint through a pipe connected with a second switch valve; a third port of the four-way joint is connected to a third inlet of the mixing device through a pipe connected with a third switch valve; a third port of the four-way joint is connected to the third tee joint through a pipe connected with a first switch valve; a fourth port of the four-way joint is connected to the third tee joint through a pipe connected with the battery heat exchanger and a battery expansion valve in sequence, and then connected to the other end of the battery heat exchanger.

[0011] In this way, by the above-mentioned pipe connection structure, the switching of various working modes can be realized by controlling the switch valves and the communication valve, so as to better adapt to the different temperature control requirements of the vehicle cabin and the battery.

[0012] 1. The battery heating mode alone, in this mode, the third switch valve and the seventh switch valve are opened, and the other switch valves are closed; the heat exchange medium flows out of the compressor, and then passes through the fifth tee joint, the fourth tee joint, the seventh switch valve, the sixth tee joint, the battery heat exchanger, the battery expansion valve, the battery heat exchanger, the four-way joint, the third switch valve, and the mixing device in sequence, and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery heat exchanger is a condenser and releases heat to warm up the battery, and the battery heat exchanger is an evaporator to absorb heat from the outside.

[0013] 2. The vehicle cabin heating mode alone, in this mode, the fourth switch valve and the eighth switch valve are opened, and the other switch valves are closed; the heat exchange medium flows out of the compressor, and then passes through the fifth tee joint, the fourth tee joint, the eighth switch valve, the first tee joint, the vehicle cabin heat exchanger, the vehicle cabin expansion valve, the vehicle cabin heat exchanger, the third tee joint, the fourth switch valve, the second tee joint, and the mixing device in sequence, and then flows back to the compressor to complete the cycle. Therefore, in this state, the vehicle cabin heat exchanger is a condenser and releases heat to warm up the vehicle cabin, and the vehicle cabin heat exchanger is an evaporator to absorb heat from the outside.

[0014] 3. The battery and the compartment dual heating mode, in this mode, the third switch valve, the seventh switch valve, the fourth switch valve and the eighth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then flows forward through the fifth three-way valve and the fourth three-way valve in turn and is then divided into two paths, one of which flows forward through the seventh switch valve, the sixth three-way valve, the battery indoor heat exchanger, the battery expansion valve, the battery outdoor heat exchanger, the four-way valve, the third switch valve, the mixing device and then flows back to the compressor to complete the cycle; the other path flows forward through the eighth switch valve, the first three-way valve, the compartment indoor heat exchanger, the compartment expansion valve, the compartment outdoor heat exchanger, the third three-way valve, the fourth switch valve, the second three-way valve, the mixing device and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery indoor heat exchanger and the compartment indoor heat exchanger are both in the condenser state and release heat, and at the same time, the battery pack and the compartment are heated. At the same time, the battery outdoor heat exchanger and the compartment outdoor heat exchanger are both in the evaporator state and absorb heat from the outside of the vehicle.

[0015] 4. The battery alone refrigeration mode, in this mode, the second switch valve and the fifth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then flows forward through the fifth three-way valve, the second switch valve, the four-way valve, the battery outdoor heat exchanger, the battery expansion valve, the battery indoor heat exchanger, the sixth three-way valve, the fifth switch valve, the mixing device and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery indoor heat exchanger is in the evaporator state and absorbs heat to cool and cool the battery pack, and the battery outdoor heat exchanger is in the condenser state and releases heat to the outside of the vehicle.

[0016] 5. The compartment alone refrigeration mode, in this mode, the second switch valve, the first switch valve and the sixth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then flows forward through the fifth three-way valve, the second switch valve, the four-way valve, the first switch valve, the third three-way valve, the compartment outdoor heat exchanger, the compartment expansion valve, the compartment indoor heat exchanger, the first three-way valve, the sixth switch valve, the second three-way valve, the mixing device and then flows back to the compressor to complete the cycle. Therefore, in this state, the compartment indoor heat exchanger is in the evaporator state and absorbs heat to cool the inside of the compartment, and the compartment outdoor heat exchanger is in the condenser state and releases heat to the outside of the vehicle.

[0017] 6. The battery and the compartment dual refrigeration mode, in this mode, the second switch valve, the fifth switch valve, the first switch valve and the sixth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then passes through the fifth three-way valve, the second switch valve and the four-way valve in turn, and then is divided into two paths, one of which flows through the battery vehicle outside heat exchanger, the battery expansion valve, the battery vehicle inside heat exchanger, the sixth three-way valve, the fifth switch valve, the mixing device and then flows back to the compressor to complete the cycle; the other path flows through the first switch valve, the third three-way valve, the compartment vehicle outside heat exchanger, the compartment expansion valve, the compartment vehicle inside heat exchanger, the first three-way valve, the sixth switch valve, the second three-way valve, the mixing device and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery vehicle inside heat exchanger and the compartment vehicle inside heat exchanger are both in the evaporator state and absorb heat to cool the compartment and the battery pack, and the battery vehicle outside heat exchanger and the compartment vehicle outside heat exchanger are both in the condenser state and release heat to the outside of the vehicle.

[0018] 7. The battery and the compartment mixed mode, in this mode, the second switch valve, the fifth switch valve, the eighth switch valve and the fourth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then passes through the fifth three-way valve to be divided into two paths, one of which passes through the second switch valve, the four-way valve, the battery vehicle outside heat exchanger, the battery expansion valve, the battery vehicle inside heat exchanger, the sixth three-way valve, the fifth switch valve, the mixing device and then flows back to the compressor to complete the cycle; the other path passes through the fourth three-way valve, the eighth switch valve, the first three-way valve, the compartment vehicle inside heat exchanger, the compartment expansion valve, the compartment vehicle outside heat exchanger, the third three-way valve, the fourth switch valve, the second three-way valve, the mixing device and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery vehicle inside heat exchanger is in the evaporator state and absorbs heat to cool the battery pack, and the battery vehicle outside heat exchanger is in the condenser state and releases heat to the outside of the vehicle. At the same time, the compartment vehicle inside heat exchanger is in the condenser state and releases heat to heat the inside of the compartment, and the compartment vehicle outside heat exchanger is in the evaporator state to absorb heat from the outside of the vehicle.

[0019] Further, the mixing device is an ejector, a first inlet is arranged in the middle of the rear end of the ejector, a second inlet and a third inlet are arranged radially along the side of the rear of the ejector, a booster section with a gradually decreasing diameter from rear to front, a mixing section with an equal diameter and an expansion section with a gradually increasing diameter are sequentially and smoothly connected in the inner cavity of the ejector from rear to front, the booster section rear end is connected with the first inlet, the second inlet and the third inlet are connected at the joint position of the booster section and the mixing section, and the outlet is arranged at the front end of the expansion section.

[0020] In this way, the heat exchange medium entering the first inlet passes through the pressurizing section, the water pressure and flow rate increase, and suction is generated, which can better suck the heat exchange medium flowing back from the second inlet or the third inlet, and quickly and uniformly mix under the action of high pressure. Therefore, when the vehicle cabin and the battery need to be simultaneously temperature-controlled, the heat exchange medium flowing back from the vehicle cabin and the battery can be fully and uniformly mixed under different flow rates and temperatures of the two circuits, and the heat exchange medium with different temperatures and flow rates can be prevented from affecting the working effect of the compressor due to uneven mixing.

[0021] Further, the first inlet, the second inlet and the third inlet of the mixing device are respectively provided with flow regulating valves. The corresponding backflow flow rate can be adjusted according to the temperature control requirements of the two circuits of the vehicle cabin and the battery, so as to better improve the overall temperature control efficiency.

[0022] Further, the vehicle cabin expansion valve and the battery expansion valve are both electronic expansion valves.

[0023] In this way, the electronic expansion valve can adjust the liquid supply amount according to the electric signal, and when the vehicle cabin and the battery need to be simultaneously temperature-controlled, the heat exchange medium flow rate of the two circuits can be adjusted according to the requirements to match the temperature environment requirements of the vehicle cabin and the battery, so as to better improve the overall temperature control efficiency.

[0024] Further, an automatic control system is also included, which comprises a vehicle cabin temperature sensor arranged in the vehicle cabin and a battery temperature sensor arranged on the battery pack, the vehicle cabin temperature sensor and the battery temperature sensor being connected to a controller, and the controller being connected to the first, second, third, fourth, fifth, sixth and seventh switch valves; an automatic control module is arranged in the controller, which is used to compare and judge the detected battery temperature and vehicle cabin temperature; when the battery temperature is lower than the battery low temperature threshold value and the vehicle cabin temperature is in the vehicle cabin comfortable temperature range, the third and seventh switch valves are controlled to be opened (the battery heat pump is also started), and the remaining switch valves are closed, so as to realize the battery-only heating mode; when the vehicle cabin temperature is lower than the vehicle cabin low temperature threshold value and the battery temperature is in the battery comfortable temperature range, the fourth and eighth switch valves are controlled to be opened, and the remaining switch valves are closed, so as to realize the vehicle cabin-only heating mode; when the battery temperature is lower than the battery low temperature threshold value and the vehicle cabin temperature is lower than the vehicle cabin low temperature threshold value, the third, seventh, fourth and eighth switch valves are controlled to be opened (the battery heat pump is also started), and the remaining switch valves are kept closed, so as to realize the battery and vehicle cabin dual-heating mode; when the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is in the vehicle cabin comfortable temperature range, the second and fifth switch valves are controlled to be opened (the battery heat pump is also started), and the remaining switch valves are kept closed, so as to realize the battery-only cooling mode; when the vehicle cabin temperature is higher than the vehicle cabin high temperature threshold value and the battery temperature is in the battery comfortable temperature range, the second, first and sixth switch valves are controlled to be opened, and the remaining switch valves are kept closed, so as to realize the vehicle cabin-only cooling mode; when the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is higher than the vehicle cabin high temperature threshold value, the second, fifth, first and sixth switch valves are controlled to be opened (the battery heat pump is also started), and the remaining switch valves are kept closed, so as to realize the battery and vehicle cabin dual-cooling mode; when the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is lower than the vehicle cabin low temperature threshold value, the second, fifth, eighth and fourth switch valves are controlled to be opened (the battery heat pump is also started), and the remaining switch valves are kept closed, so as to realize the battery and vehicle cabin mixed mode.

[0025] Therefore, the automatic detection and control of multiple function modes are realized. In implementation, the battery low temperature threshold value and the battery high temperature threshold value are determined according to the performance parameters of the battery, and the battery comfortable temperature range is between the two threshold values. The vehicle cabin low temperature threshold value and the vehicle cabin high temperature threshold value are determined according to the minimum and maximum values of the human comfortable temperature range, and the vehicle cabin comfortable temperature range is the human comfortable temperature range.

[0026] Further, the fourth three-way and the fifth three-way are flow-regulating three-way valves (capable of regulating the flow area of each interface) and are connected to the controller, the four-way is a flow-regulating four-way valve (capable of regulating the flow area of each interface) and is connected to the controller, and the automatic control module further has a flow self-regulating function. When the battery temperature is less than the battery low temperature threshold value and the cabin temperature is less than the cabin low temperature threshold value (double heating mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the fourth three-way are adjusted in proportion to the proportion. When the battery temperature is higher than the battery high temperature threshold value and the cabin temperature is higher than the cabin high temperature threshold value (double cooling mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the four-way are adjusted in proportion to the proportion. When the battery temperature is higher than the battery high temperature threshold value and the cabin temperature is lower than the cabin low temperature threshold value (battery and cabin mixed mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the fifth three-way are adjusted in proportion to the proportion.

[0027] In this way, when the cabin and the battery need to be simultaneously temperature-controlled, the proportion of the refrigerant flow in the circuit can be adjusted according to the demand for cooling or heating of the battery and the cabin, so that more refrigerant is distributed to the circuit with greater demand for temperature control adjustment, thereby better improving the overall temperature control efficiency of the vehicle.

[0028] Further, the second flow channels are provided in the cabin heat exchanger and the battery heat exchanger, and the pipes of the circulating pumps connected to the two ends of the respective second flow channels constitute a mixed mode heat exchange circulating pipeline.

[0029] In this way, the circulating pump is connected to the controller, and when the battery temperature is higher than the battery high temperature threshold value and the cabin temperature is lower than the cabin low temperature threshold value (battery and cabin mixed mode), the automatic control module of the controller controls the second, fifth, eighth, and fourth on-off valves to be opened, and simultaneously controls the circulating pump to be turned on (the circulating pump is in an off state in the remaining modes), so that the battery heat exchanger releases heat to directly heat the cabin heat exchanger, thereby greatly improving the heat exchange temperature control efficiency of the two sets of heat exchange pipelines.

[0030] Therefore, this solution constructs a high-efficiency, low-carbon all-weather air conditioning system for new energy vehicles through injector efficiency enhancement and multi-loop coupling, solving the core pain points of low energy efficiency and poor environmental compatibility of traditional systems. This solution has the following innovations: 1) Injector efficiency enhancement and compressor synergistic enhancement: Traditional electric vehicle heat pump systems mostly rely on single-stage compressors and PTC auxiliary heating, resulting in limited efficiency. This design innovatively integrates adjustable nozzle injectors at the compressor front end, utilizing high-pressure mainstream to induce low-pressure secondary flow, improving the reflux mixing effect and significantly increasing compressor suction pressure, reducing compression power consumption, and improving system COP. 2) Multi-loop coupled dynamic thermal management: Employing dual condensers, dual evaporators / coolers, and independent electronic expansion valve (EEV) control, it achieves complete decoupling of the vehicle compartment and battery thermal management loops and independent pressure / temperature optimization, supporting efficient and precise temperature control under complex all-weather conditions. 3) High applicability and promotional value: This solution, through multi-mode switching and wide temperature range adaptation design, accurately covers the full-scenario thermal management needs of new energy vehicles and electric aircraft. In terms of extreme climate adaptability, the R600a COP reaches 4.37 in heating mode at low temperatures (−25°C), improving range by 30-50% compared to traditional PTC systems and effectively alleviating range anxiety in winter. In high-temperature environments (45°C), the cooling mode maintains a COP of 5.20. Regarding multi-objective collaborative management, the hybrid mode supports simultaneous operation of cabin heating (condensation temperature 60°C) and battery cooling (evaporation temperature −25°C), addressing complex thermal demands such as high-load driving in winter. The system dynamically adjusts the pressure of each evaporator through independent EEV, meeting the requirements of electric vehicles for high-energy-density and high-efficiency thermal control systems, and possesses significant cross-industry application potential.

[0031] In summary, this invention can better meet the temperature control requirements of both the vehicle compartment and the battery, improve the efficiency of heat and cold utilization, and save energy and consumption. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the electric vehicle compartment and battery temperature control system in Embodiment 1 of the present invention.

[0033] Figure 2 for Figure 1 A schematic diagram of the heat exchange medium flow direction in battery-only heating mode, with arrows indicating the flow direction.

[0034] Figure 3 for Figure 1 A schematic diagram of the heat exchange medium flow direction in the individual heating mode of the carriage. The arrows in the diagram indicate the flow direction.

[0035] Figure 4 for Figure 1 A schematic diagram of the heat exchange medium flow direction under dual heating modes of battery and vehicle compartment. The arrows in the diagram indicate the flow direction.

[0036] Figure 5 For Figure 1 The heat exchange medium flow direction schematic diagram in the battery independent refrigeration mode, the arrow in the figure indicates the flow direction.

[0037] Figure 6 For Figure 1 The heat exchange medium flow direction schematic diagram in the car compartment independent refrigeration mode, the arrow in the figure indicates the flow direction.

[0038] Figure 7 For Figure 1 The heat exchange medium flow direction schematic diagram in the battery and car compartment double refrigeration mode, the arrow in the figure indicates the flow direction.

[0039] Figure 8 For Figure 1 The heat exchange medium flow direction schematic diagram in the battery and car compartment mixed mode, the arrow in the figure indicates the flow direction.

[0040] Figure 9 The structure schematic diagram of the electric vehicle car compartment and battery temperature control system in the embodiment 2 of the present application. DETAILED DESCRIPTION

[0041] The present application will be further described in detail below in combination with specific embodiments.

[0042] Embodiment 1: a battery-powered vehicle temperature control method, characterized in that two sets of air conditioning heat exchange systems sharing one compressor are used to independently control the temperature of the car compartment and the battery pack, and the battery pack temperature is detected in real time during the control process, when the battery pack temperature is lower than the battery low temperature warning threshold, a heat exchanger close to the battery pack is controlled to be converted into a condenser and supply heat for the battery pack, when the battery pack temperature is higher than the battery high temperature warning threshold, the heat exchanger is controlled to be converted into an evaporator and supply cold for the battery pack.

[0043] In this way, the car compartment and the battery pack each use a set of air conditioning heat exchange system to achieve independent control, which can better meet the temperature control needs of the car compartment and the battery. Two sets of air conditioning systems share one compressor, which better saves equipment cost. Among them, a single heat exchanger close to the battery pack is used to supply heat or cold for the battery pack to achieve battery temperature control when needed, avoiding the loss of cold and heat during flow, and better improving the cold and heat utilization efficiency. Therefore, it has the characteristics of better energy saving and consumption saving.

[0044] The method of the embodiment is realized by an electric vehicle cabin and battery temperature control system, as shown in 1-8. The electric vehicle cabin and battery temperature control system comprises a cabin vehicle outside heat exchanger 1 installed on the outside of the vehicle body and a cabin vehicle inside heat exchanger 2 installed inside the cabin. A cabin expansion valve 3 is arranged in series between the cabin vehicle outside heat exchanger 1 and the cabin vehicle inside heat exchanger 2. The other end of the cabin expansion valve 3 is connected to a compressor 4 through a reversible regulation loop to form a cabin heat exchange control loop capable of realizing reverse conversion control. The system further comprises a battery vehicle outside heat exchanger 5 installed on the outside of the vehicle body and a battery vehicle inside heat exchanger 6 installed at the position of the battery pack. A battery expansion valve 7 is arranged in series between the battery vehicle outside heat exchanger 5 and the battery vehicle inside heat exchanger 6. The other end of the battery expansion valve 7 is connected to the reversible regulation loop to form a battery heat exchange control loop capable of realizing reverse conversion control. The battery vehicle inside heat exchanger further comprises a second flow channel. The second flow channel of the battery vehicle inside heat exchanger is connected to a battery heat exchange circulating pipeline 8. A battery heat exchange pump 9 is installed on the battery heat exchange circulating pipeline 8 to realize heat exchange by flowing through the battery pack 10.

[0045] Thus, in the present application, on the basis of the existing cabin heat exchange control loop air conditioning system, a semi-independent battery heat exchange control loop is designed. The battery vehicle outside heat exchanger located on the outside of the vehicle body can directly supply cold or heat from the outside of the vehicle to the battery vehicle inside heat exchanger and release it to the battery pack, realizing the heating or cooling function of the battery pack. Since the battery vehicle inside heat exchanger is directly installed at the position of the battery pack and the cooling or heating of the battery is realized directly through the battery vehicle inside heat exchanger, when the battery vehicle inside heat exchanger and the battery heat exchange realize the temperature regulation of the battery, the battery heat exchange pump is opened, and the heat or cold of the battery vehicle inside heat exchanger is directly supplied to the battery pack through the second flow channel connected to the battery heat exchange circulating pipeline, avoiding the energy loss caused by the long-distance secondary flow of heat or cold in the delivery process. At the same time, the independence of the battery heat exchange control loop makes the temperature regulation of the battery by the battery vehicle inside heat exchanger not affected by the cabin vehicle inside heat exchanger (i.e., they can operate simultaneously in cooling and heating). In addition, since the battery heat exchange control loop and the cabin heat exchange control loop are coupled through the reversible regulation loop, they can share a compressor to realize air conditioning refrigeration (or heating), and the compressor is a core component of the air conditioning system with high cost. Therefore, this method saves device cost by sharing the compressor, and also realizes the flow distribution of the heat exchange medium in the battery heat exchange control loop and the cabin heat exchange control loop through the reversible regulation loop; for example, when the weather temperature is moderate and the cabin temperature control regulation demand is low, more heat exchange medium can be delivered to the battery heat exchange control loop to better ensure the temperature control demand of the battery.

[0046] The reversible adjustment circuit comprises a first three-way valve G1 installed on a pipe connected to one end of the vehicle cabin heat exchanger, the pipe is connected to a sixth switch valve V6, a second three-way valve G2, a fourth switch valve V4, a third three-way valve G3, the vehicle cabin heat exchanger and a vehicle cabin expansion valve in sequence, and then connected to the other end of the vehicle cabin heat exchanger; a third port of the first three-way valve G1 is connected to a fourth three-way valve G4 through a pipe with an eighth switch valve V8, and then connected to a third port of a fifth three-way valve G5; a third port of the second three-way valve G2 is connected to a first inlet of a mixing device 11 through a pipe; a pipe connected to one end of the battery heat exchanger is connected to a sixth three-way valve G6 and a fifth switch valve V5 in sequence, and then connected to a second inlet of the mixing device 11; a third port of the sixth three-way valve G6 is connected to a third port of the fourth three-way valve G4 through a pipe; an outlet of the mixing device is connected to the compressor, and then connected to a first port of the fifth three-way valve G5; a second port of the fifth three-way valve G5 is connected to a first port of a four-way valve G7 through a pipe with a second switch valve V2; a second port of the four-way valve G7 is connected to a third inlet of the mixing device through a pipe with a third switch valve V3; a third port of the four-way valve G7 is connected to the third three-way valve G3 through a pipe with a first switch valve V1; and a fourth port of the four-way valve G7 is connected to the other end of the battery heat exchanger through a pipe with the battery heat exchanger and a battery expansion valve in sequence.

[0047] In this way, through the above-mentioned pipe connection structure, the switching of various working modes can be realized by controlling the switch valves and the communication valve, so as to better adapt to the different temperature control requirements of the vehicle cabin and the battery.

[0048] 1. The battery heating mode alone, in this mode, the third switch valve and the seventh switch valve are opened, and the other switch valves are closed; the heat exchange medium flows out of the compressor, and then passes through the fifth three-way valve, the fourth three-way valve, the seventh switch valve, the sixth three-way valve, the battery heat exchanger, the battery expansion valve, the battery heat exchanger, the four-way valve, the third switch valve, and the mixing device in sequence, and then flows back to the compressor to complete the cycle. Therefore, in this state, the battery heat exchanger is a condenser and releases heat to warm up the battery, and the battery heat exchanger is an evaporator to absorb heat from the outside.

[0049] 2. The car compartment alone heating mode, in this mode, the fourth and eighth switch valves are opened, and the rest of the switch valves are closed; the heat exchange medium flows out of the compressor, and then sequentially passes through the fifth, fourth, eighth switch valves, first three-way valve, car compartment indoor heat exchanger, car compartment expansion valve, car compartment outdoor heat exchanger, third three-way valve, fourth switch valve, second three-way valve, and then flows back to the compressor to complete the circulation. Therefore, in this state, the car compartment indoor heat exchanger is a condenser and releases heat to warm up the car compartment, and the car compartment outdoor heat exchanger is an evaporator to absorb heat from the outside.

[0050] 3. The battery and car compartment dual heating mode, in this mode, the third, seventh, fourth and eighth switch valves are opened, and the rest of the switch valves are closed; the heat exchange medium flows out of the compressor, and then sequentially passes through the fifth and fourth three-way valves, and then is divided into two paths, one of which flows forward through the seventh switch valve, sixth three-way valve, battery indoor heat exchanger, battery expansion valve, battery outdoor heat exchanger, four-way valve, third switch valve, mixing device, and then flows back to the compressor to complete the circulation; the other path flows forward through the eighth switch valve, first three-way valve, car compartment indoor heat exchanger, car compartment expansion valve, car compartment outdoor heat exchanger, third three-way valve, fourth switch valve, second three-way valve, mixing device, and then flows back to the compressor to complete the circulation. Therefore, in this state, the battery and car compartment indoor heat exchangers are condensers and release heat, and at the same time, the battery and car compartment are heated. At the same time, the battery and car compartment outdoor heat exchangers are evaporators and absorb heat from the outside.

[0051] 4. The battery alone cooling mode, in this mode, the second and fifth switch valves are opened, and the rest of the switch valves are closed; the heat exchange medium flows out of the compressor, and then sequentially passes through the fifth three-way valve, second switch valve, four-way valve, battery outdoor heat exchanger, battery expansion valve, battery indoor heat exchanger, sixth three-way valve, fifth switch valve, mixing device, and then flows back to the compressor to complete the circulation. Therefore, in this state, the battery indoor heat exchanger is an evaporator and absorbs heat to cool the battery, and the battery outdoor heat exchanger is a condenser and releases heat to the outside.

[0052] 5. The car compartment alone cooling mode, in this mode, the second, first and sixth switch valves are opened, and the rest of the switch valves are closed; the heat exchange medium flows out of the compressor, and then sequentially passes through the fifth three-way valve, second switch valve, four-way valve, first switch valve, third three-way valve, car compartment outdoor heat exchanger, car compartment expansion valve, car compartment indoor heat exchanger, first three-way valve, sixth switch valve, second three-way valve, mixing device, and then flows back to the compressor to complete the circulation. Therefore, in this state, the car compartment indoor heat exchanger is an evaporator and absorbs heat to cool the car compartment, and the car compartment outdoor heat exchanger is a condenser and releases heat to the outside.

[0053] 6. The battery and the compartment dual refrigeration mode, in this mode, the second switch valve, the fifth switch valve, the first switch valve and the sixth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then passes through the fifth three-way valve, the second switch valve and the four-way valve in turn, and then is divided into two paths, one of which flows through the battery vehicle outside heat exchanger, the battery expansion valve, the battery vehicle inside heat exchanger, the sixth three-way valve, the fifth switch valve, the mixing device and then flows back to the compressor to complete the circulation; the other path flows through the first switch valve, the third three-way valve, the compartment vehicle outside heat exchanger, the compartment expansion valve, the compartment vehicle inside heat exchanger, the first three-way valve, the sixth switch valve, the second three-way valve and the mixing device and then flows back to the compressor to complete the circulation. Therefore, in this state, the battery vehicle inside heat exchanger and the compartment vehicle inside heat exchanger are in the evaporator state and absorb heat to cool the compartment and the battery pack, and the battery vehicle outside heat exchanger and the compartment vehicle outside heat exchanger are in the condenser state and release heat to the outside of the vehicle.

[0054] 7. The battery and the compartment mixed mode, in this mode, the second switch valve, the fifth switch valve, the eighth switch valve and the fourth switch valve are controlled to be in the open state, and the remaining switch valves are in the closed state; the heat exchange medium flows out from the compressor and then passes through the fifth three-way valve and is divided into two paths, one of which passes through the second switch valve, the four-way valve, the battery vehicle outside heat exchanger, the battery expansion valve, the battery vehicle inside heat exchanger, the sixth three-way valve, the fifth switch valve, the mixing device and then flows back to the compressor to complete the circulation; the other path passes through the fourth three-way valve, the eighth switch valve, the first three-way valve, the compartment vehicle inside heat exchanger, the compartment expansion valve, the compartment vehicle outside heat exchanger, the third three-way valve, the fourth switch valve, the second three-way valve and the mixing device and then flows back to the compressor to complete the circulation. Therefore, in this state, the battery vehicle inside heat exchanger is in the evaporator state and absorbs heat to cool the battery pack, and the battery vehicle outside heat exchanger is in the condenser state and releases heat to the outside of the vehicle. At the same time, the compartment vehicle inside heat exchanger is in the condenser state and releases heat to heat the inside of the compartment, and the compartment vehicle outside heat exchanger is in the evaporator state to absorb heat from the outside of the vehicle.

[0055] The mixing device 11 is an ejector, a first inlet is arranged in the middle of the rear end of the ejector, a second inlet and a third inlet are arranged radially on the side of the rear of the ejector, a booster section with a gradually decreasing diameter from rear to front, a mixing section with an equal diameter and an expansion section with a gradually increasing diameter are sequentially and smoothly connected in the cavity of the ejector, the booster section is connected with the first inlet at the rear end, the second inlet and the third inlet are connected at the joint position of the booster section and the mixing section, and an outlet is arranged at the front end of the expansion section.

[0056] In this way, the heat exchange medium entering through the first inlet passes through the pressurizing section, and the water pressure and flow rate increase, generating suction, which can better suck the heat exchange medium flowing back through the second inlet or the third inlet and mix uniformly under high pressure. Therefore, when the vehicle cabin and the battery need to be simultaneously temperature-controlled, the heat exchange medium flowing back at different flow rates and temperatures in the respective circuits can be fully mixed and uniform, avoiding the influence of mixed heat exchange medium at different temperatures and flow rates on the working effect of the compressor.

[0057] The automatic control system includes a vehicle cabin temperature sensor arranged in the vehicle cabin and a battery temperature sensor installed on the battery pack (not shown in the figure), and the vehicle cabin temperature sensor and the battery temperature sensor are connected to the controller. The controller is connected to the first, second, third, fourth, fifth, sixth and seventh switch valves. An automatic control module is arranged in the controller, which is used to compare and judge the detected battery temperature and vehicle cabin temperature. When the battery temperature is less than the battery low temperature threshold value and the vehicle cabin temperature is in the comfortable temperature range of the vehicle cabin, the third and seventh switch valves are opened (the battery heat pump is also started), and the remaining switch valves are closed, realizing the battery heating mode alone. When the vehicle cabin temperature is less than the low temperature threshold value of the vehicle cabin and the battery temperature is in the comfortable temperature range of the battery, the fourth and eighth switch valves are opened, and the remaining switch valves are closed, realizing the vehicle cabin heating mode alone. When the battery temperature is less than the battery low temperature threshold value and the vehicle cabin temperature is less than the low temperature threshold value of the vehicle cabin, the third, seventh, fourth and eighth switch valves are opened (the battery heat pump is also started), and the remaining switch valves are kept closed, realizing the battery and vehicle cabin heating mode. When the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is in the comfortable temperature range of the vehicle cabin, the second and fifth switch valves are opened (the battery heat pump is also started), and the remaining switch valves are kept closed, realizing the battery cooling mode alone. When the vehicle cabin temperature is higher than the high temperature threshold value of the vehicle cabin and the battery temperature is in the comfortable temperature range of the battery, the second, first and sixth switch valves are opened, and the remaining switch valves are kept closed, realizing the vehicle cabin cooling mode alone. When the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is higher than the high temperature threshold value of the vehicle cabin, the second, fifth, first and sixth switch valves are opened (the battery heat pump is also started), and the remaining switch valves are kept closed, realizing the battery and vehicle cabin cooling mode. When the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is lower than the low temperature threshold value of the vehicle cabin, the second, fifth, eighth and fourth switch valves are opened (the battery heat pump is also started), and the remaining switch valves are kept closed, realizing the battery and vehicle cabin mixed mode.

[0058] Thus, the automatic detection control of multiple function modes is realized. In the implementation, the battery low temperature threshold and the battery high temperature threshold are determined by the battery performance parameters, and the battery comfortable temperature range is between the two thresholds. The vehicle cabin low temperature threshold and the vehicle cabin high temperature threshold are determined by the minimum and maximum values of the human comfortable temperature range, and the human comfortable temperature range is the vehicle cabin comfortable temperature range.

[0059] In the embodiment, the fourth three-way valve and the fifth three-way valve are flow regulating three-way valves (capable of regulating the flow area of each interface) and are connected to the controller, the four-way valve is a flow regulating four-way valve (capable of regulating the flow area of each interface) and is connected to the controller, and the automatic control module further has a flow self-regulating function. When the battery temperature is less than the battery low temperature threshold and the vehicle cabin temperature is less than the vehicle cabin low temperature threshold (double heating mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the fourth three-way valve are adjusted in proportion to the proportion. When the battery temperature is higher than the battery high temperature threshold and the vehicle cabin temperature is higher than the vehicle cabin high temperature threshold (double cooling mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the four-way valve are adjusted in proportion to the proportion. When the battery temperature is higher than the battery high temperature threshold and the vehicle cabin temperature is lower than the vehicle cabin low temperature threshold (battery and vehicle cabin mixed mode), the proportion of the respective difference values of the two is compared, and the flow areas of the two outflow interfaces of the fifth three-way valve are adjusted in proportion to the proportion.

[0060] Thus, when the vehicle cabin and the battery need to be simultaneously controlled, the proportion of the refrigerant flow of the circuit can be adjusted according to the demand for cooling or heating of the vehicle cabin and the battery, so that more refrigerant is distributed to the circuit with higher demand for temperature control, thereby improving the overall temperature control efficiency of the vehicle.

[0061] As another implementation, the first inlet, the second inlet, and the third inlet of the mixing device are respectively provided with flow regulating valves. The flow of the corresponding circuit can be adjusted according to the temperature control demand of the vehicle cabin and the battery, thereby improving the overall temperature control efficiency.

[0062] In the implementation, the vehicle cabin expansion valve and the battery expansion valve can also be electronic expansion valves.

[0063] Thus, the electronic expansion valve can adjust the liquid supply according to the electric signal. When the vehicle cabin and the battery need to be simultaneously controlled, the flow of the two circuits can be adjusted according to the demand for temperature control of the vehicle cabin and the battery, thereby improving the overall temperature control efficiency.

[0064] Embodiment 2, see Figure 9The embodiment is based on the embodiment 1, and a mixed mode heat exchange circulation pipeline is added. The other schemes are completely consistent. Specifically, in the embodiment, the second flow channel is arranged in the vehicle compartment heat exchanger and the battery heat exchanger, and the pipeline of the circulating pump 12 is externally connected to the two ends of the respective second flow channels to form a mixed mode heat exchange circulation pipeline 13. The other schemes are described in the embodiment 1, and are not repeated here.

[0065] In this way, the circulating pump and the controller are connected. When it is detected that the battery temperature is higher than the battery high temperature threshold value and the vehicle compartment temperature is lower than the vehicle compartment low temperature threshold value (battery and vehicle compartment mixed mode), the automatic control module of the controller controls the second, fifth, eighth and fourth switch valves to be opened, and simultaneously controls the circulating pump to be started (the circulating pump is in a closed state in the other modes), so that the battery heat exchanger replaces the released heat to directly heat the vehicle compartment heat exchanger, and the heat exchange temperature control efficiency of the two sets of heat exchange pipelines is greatly improved.

Claims

1. A method for temperature control of a battery electric vehicle, characterized by, The two sets of air conditioning heat exchange systems share one compressor to independently control the temperature of the vehicle cabin and the battery pack. During the control process, the battery pack temperature is detected in real time. When the battery pack temperature is lower than the low temperature warning threshold, a heat exchanger close to the battery pack is converted into a condenser to provide heat for the battery pack. When the battery pack temperature is higher than the high temperature warning threshold, the heat exchanger is converted into an evaporator to provide cooling for the battery pack.

2. The battery electric vehicle temperature control method of claim 1, wherein, The method is realized by an electric vehicle cabin and battery temperature control system. The electric vehicle cabin and battery temperature control system comprises a cabin vehicle outside heat exchanger installed on the outside of the vehicle body and a cabin vehicle inside heat exchanger installed in the cabin. A cabin expansion valve is connected in series between the cabin vehicle outside heat exchanger and the cabin vehicle inside heat exchanger. The other end is connected to a compressor by a reversible regulation circuit to form a cabin heat exchange control circuit capable of realizing reverse conversion control. The system further comprises a battery vehicle outside heat exchanger installed on the outside of the vehicle body and a battery vehicle inside heat exchanger installed at the position of the battery pack. A battery expansion valve is connected in series between the battery vehicle outside heat exchanger and the battery vehicle inside heat exchanger. The other end is connected to the reversible regulation circuit to form a battery heat exchange control circuit capable of realizing reverse conversion control. The battery vehicle inside heat exchanger further comprises a second flow channel. The second flow channel of the battery vehicle inside heat exchanger is connected to a battery heat exchange circulating pipeline. A battery heat exchange pump is installed on the battery heat exchange circulating pipeline to realize heat exchange of the battery pack.

3. The battery electric vehicle temperature control method of claim 2, wherein, The reversible regulation circuit comprises a first three-way valve installed on the one end of the cabin vehicle inside heat exchanger. The outlet pipe of the one end is connected to a sixth switch valve, a second three-way valve, a fourth switch valve, a third three-way valve, the cabin vehicle outside heat exchanger, and the cabin expansion valve in sequence, and then connected to the other end of the cabin vehicle inside heat exchanger. The third interface of the first three-way valve is connected to a fourth three-way valve through a pipe with an eighth switch valve installed thereon. The third interface of the second three-way valve is connected to a first inlet of a mixing device through a pipe. The one end of the battery vehicle inside heat exchanger is connected to a sixth three-way valve and a fifth switch valve in sequence and then connected to a second inlet of the mixing device. The third interface of the sixth three-way valve is connected to the third interface of the fourth three-way valve through a pipe with a seventh switch valve installed thereon. The outlet of the mixing device is connected to the compressor and then connected to a first interface of the fifth three-way valve. The second interface of the fifth three-way valve is connected to a second switch valve and then connected to a first interface of a four-way valve. The second interface of the four-way valve is connected to a third switch valve and then connected to a third inlet of the mixing device. The third interface of the four-way valve is connected to a first switch valve and then connected to the third three-way valve. The fourth interface of the four-way valve is connected to the battery vehicle outside heat exchanger and the battery expansion valve in sequence and then connected to the other end of the battery vehicle inside heat exchanger.

4. The battery electric vehicle temperature control method of claim 3, wherein, The mixing device is an injector, a first inlet is arranged in the middle of the rear end of the injector, a second inlet and a third inlet are arranged in the radial direction of the rear side of the injector, an inner cavity of the injector is sequentially and smoothly connected from the rear to the front by a booster section with a gradually decreasing diameter, a mixing section with an equal diameter, and an expansion section with a gradually increasing diameter, the booster section is connected with the first inlet, the second inlet and the third inlet are connected at the joint position of the booster section and the mixing section, and an outlet is arranged at the front end of the expansion section.

5. The battery electric vehicle temperature control method of claim 3, wherein, The first inlet, the second inlet and the third inlet of the mixing device are respectively provided with a flow regulating valve.

6. The battery electric vehicle temperature control method of claim 3, wherein, The vehicle cabin expansion valve and the battery expansion valve are both electronic expansion valves.

7. The battery electric vehicle temperature control method of claim 3, wherein, An automatic control system is further included, the automatic control system comprises a vehicle cabin temperature sensor arranged in the vehicle cabin and a battery temperature sensor arranged on the battery pack, the vehicle cabin temperature sensor and the battery temperature sensor are connected with a controller, the controller is connected with the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, the sixth switch valve and the seventh switch valve; an automatic control module is arranged in the controller, the automatic control module is used for comparing and judging according to the detected battery temperature and the vehicle cabin temperature; when the battery temperature is less than a battery low temperature threshold value and the vehicle cabin temperature is in a vehicle cabin comfortable temperature range, the third switch valve and the seventh switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a battery-only heating mode; when the vehicle cabin temperature is less than a vehicle cabin low temperature threshold value and the battery temperature is in a battery comfortable temperature range, the fourth switch valve and the eighth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a vehicle-only heating mode; when the battery temperature is less than the battery low temperature threshold value and the vehicle cabin temperature is less than the vehicle cabin low temperature threshold value, the third switch valve, the seventh switch valve, the fourth switch valve and the eighth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a battery and vehicle double heating mode; when the battery temperature is higher than a battery high temperature threshold value and the vehicle cabin temperature is in the vehicle cabin comfortable temperature range, the second switch valve and the fifth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a battery-only cooling mode; when the vehicle cabin temperature is higher than a vehicle cabin high temperature threshold value and the battery temperature is in the battery comfortable temperature range, the second switch valve, the first switch valve and the sixth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a vehicle-only cooling mode; when the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is higher than the vehicle cabin high temperature threshold value, the second switch valve, the fifth switch valve, the first switch valve and the sixth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a battery and vehicle double cooling mode; when the battery temperature is higher than the battery high temperature threshold value and the vehicle cabin temperature is lower than the vehicle cabin low temperature threshold value, the second switch valve, the fifth switch valve, the eighth switch valve and the fourth switch valve are controlled to be opened, and the remaining switch valves are controlled to be closed, so as to realize a battery and vehicle mixed mode.

8. The battery electric vehicle temperature control method of claim 7, wherein, The fourth and fifth three-way valves are flow-regulating three-way valves and are connected to the controller, the four-way valve is a flow-regulating four-way valve and is connected to the controller, and the automatic control module further has a flow self-regulating function; when the battery temperature is less than the battery low temperature threshold value and the cabin temperature is less than the cabin low temperature threshold value, the proportion of the respective difference values of the two is compared, and the flow area of the two outflow interfaces of the fourth three-way valve is adjusted in proportion to the proportion; when the battery temperature is higher than the battery high temperature threshold value and the cabin temperature is higher than the cabin high temperature threshold value, the proportion of the respective difference values of the two is compared, and the flow area of the two outflow interfaces of the four-way valve is adjusted in proportion to the proportion; when the battery temperature is higher than the battery high temperature threshold value and the cabin temperature is less than the cabin low temperature threshold value, the proportion of the respective difference values of the two is compared, and the flow area of the two outflow interfaces of the fifth three-way valve is adjusted in proportion to the proportion.

9. The battery electric vehicle temperature control method of claim 7, wherein, The second flow channels are provided in the cabin external heat exchanger and the battery external heat exchanger, and the pipes of the circulating pumps connected to the two ends of the respective second flow channels constitute a mixed-mode heat exchange circulating pipeline.

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