Power battery temperature control system, thermal management system and control method of electric vehicle

Abstract

The application provides a power battery temperature control system, a thermal management system and a control method for an electric vehicle, and the system comprises: a heat preservation layer arranged outside a power battery pack and used for preserving heat of the power battery pack; a circulating medium loop connected with the power battery pack; a temperature regulation component arranged on a pipeline of the circulating medium loop and used for controlling circulation of a circulating medium between a temperature regulation device and the power battery pack through the circulating medium loop; a temperature detection module used for detecting a temperature of the power battery pack; and a control module used for controlling the temperature regulation component to regulate the temperature of the power battery pack according to the temperature of the power battery pack. The system can solve the problem that the electric vehicle cannot normally charge and discharge in a cold region and the problem of a large decrease in a cruising range, and can simultaneously preserve heat of the power battery in winter and dissipate heat of the power battery in summer, so that efficient control of the temperature of the power battery under all-year working conditions is realized, and the safety and the cruising performance of the electric vehicle are improved.

Description

Electric vehicle power battery temperature control system, thermal management system and control method Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a power battery temperature control system, thermal management system and control method for electric vehicles. Background Technology

[0002] With the increasing severity of the traditional energy crisis and environmental pollution, electric vehicles powered by new energy sources are attracting more and more attention. As one of the core components of new energy vehicles, the temperature control of the power battery is crucial for the safe and efficient operation of electric vehicles. Excessive battery temperature can lead to battery pack leakage and thermal runaway, causing serious safety hazards; conversely, excessively low battery temperature can cause the vehicle to fail to start, charging difficulties, and a sharp reduction in driving range, severely impacting vehicle performance. Especially in winter, the significant performance degradation caused by excessively low battery temperature has become a major obstacle to the widespread application of electric vehicles in cold regions.

[0003] Existing electric vehicle battery thermal management systems employ passive insulation or active heating to control battery temperature during winter. Passive insulation technology, which involves directly adding an insulation shell, suffers from problems such as impaired heat dissipation and increased risk of thermal runaway in high-temperature environments when battery temperatures are too high in summer. Similarly, existing active heating technologies suffer from long start-up times, high energy consumption, reduced battery capacity, and impact on vehicle range.

[0004] Therefore, there is an urgent need for a power battery temperature control system for electric vehicles that can solve the above problems and balance the insulation of the power battery in winter and the heat dissipation in summer, while maintaining low operating energy consumption. Summary of the Invention

[0005] This invention provides a power battery temperature control system, thermal management system, and control method for electric vehicles, which solves the technical defects of existing technologies such as the inability to meet the temperature control requirements of different operating conditions throughout the year and the high energy consumption of the temperature control system, thereby improving the safety and range performance of electric vehicles in cold regions.

[0006] This invention provides a power battery temperature control system for an electric vehicle, comprising: an insulation layer disposed outside the power battery pack for insulating the power battery pack; a circulating medium loop connected to the power battery pack; a temperature regulating component disposed on a pipeline of the circulating medium loop for controlling the circulating medium to circulate between the temperature regulating component and the power battery pack through the circulating medium loop; a temperature detection module for detecting the temperature of the power battery pack; and a control module for controlling the temperature regulating component to regulate the temperature of the power battery pack based on the temperature of the power battery pack.

[0007] According to the present invention, a power battery temperature control system for an electric vehicle includes a temperature regulating device, which is an electric heating device and a single-cooling vapor compression refrigeration cycle device or a heat pump vapor compression refrigeration cycle device.

[0008] According to the present invention, a power battery temperature control system for an electric vehicle includes a temperature control component further comprising: a waste heat source for recovering and heating the power battery pack when the temperature of the waste heat source is higher than a preset temperature threshold; and a natural cold source for naturally cooling the power battery pack when the ambient temperature is lower than the preset temperature threshold.

[0009] According to the present invention, a power battery temperature control system for an electric vehicle further includes a first channel, a second channel, and a third channel arranged in parallel on the circulating medium circuit; the temperature control component further includes: a first valve disposed on the connecting pipe between the first channel and the circulating medium circuit; a second valve disposed on the connecting pipe between the second channel and the circulating medium circuit; a third valve disposed on the connecting pipe between the third channel and the circulating medium circuit; a fourth valve and a fifth valve disposed on the pipe between the first channel and the second channel; a first circulation pump disposed on the pipe between the power battery pack and the first channel; and a second circulation pump disposed on the pipe between the second channel and the third channel.

[0010] According to the present invention, a power battery temperature control system for an electric vehicle is provided, wherein the waste heat source is a drive motor, which is disposed on the second channel for exchanging heat with the circulating medium in the second channel; the natural cold source is an air-cooled heat exchanger, which is disposed on the third channel for driving ambient air from outside the vehicle to flow through the air-cooled heat exchanger and exchange heat with the circulating medium in the third channel.

[0011] According to the present invention, a power battery temperature control system for an electric vehicle is provided, wherein the insulation layer is detachably wrapped around the outside of the power battery pack.

[0012] The present invention also provides a power battery thermal management system for electric vehicles, including the aforementioned power battery temperature control system for electric vehicles, and further including a power battery pack with a receiving space; the power battery pack includes: a power battery pack shell disposed outside the receiving space; a power battery module and a power battery heat exchange device disposed inside the receiving space; the power battery module includes multiple power battery cells; the power battery heat exchange device is connected to the circulating medium loop through a circulating medium inlet and a circulating medium outlet.

[0013] The present invention also provides a control method for the power battery temperature control system of an electric vehicle according to the above, comprising: determining the vehicle state, the temperature of the power battery pack, the ambient temperature outside the vehicle, and the temperature of the drive motor; and determining the operating mode of the temperature regulation component based on the vehicle state, the temperature of the power battery pack, the ambient temperature outside the vehicle, and the temperature of the drive motor.

[0014] According to the present invention, a control method for a power battery temperature control system of an electric vehicle is provided, wherein the operating mode of the temperature regulation component includes: when the vehicle is in a charging or driving state and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3 <T 3,H When the air-cooled heat exchanger is in charging or driving condition, open the fan, third valve, fourth valve, and fifth valve; when T 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in a charging or driving state and T 0,L <T 2,L And T4≤T 4,L At that time, or when the vehicle is in a pre-start state and T 0,L <T 2,L At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in parked state and T 0,L <T 1,L At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3≥T 3,H At that time, the temperature control device and the first valve are activated; when the vehicle is in charging or driving mode and T... 0,L <T 2,L And T4>T 4,L When the vehicle is in charging or driving state and T... 0,L ≥T 2,L And T 0,H ≤T 2,H At that time, or when the vehicle is in a pre-start state and T 0,L ≥T 2,L And T 0,H ≤T 2,HAt that time, or when the vehicle is in parked state and T 0,L ≥T 1,L And T 0,H ≤T 1,H When T is not running; 1,H To preset the maximum threshold temperature of the power battery during vehicle parking, T 1,L To preset the minimum threshold temperature of the power battery during vehicle parking; T 2,H T is the preset maximum temperature threshold of the power battery during vehicle charging or driving. 2,L The minimum threshold temperature of the power battery during vehicle charging or driving is preset; T 3,H To preset the maximum threshold for natural cooling of outdoor ambient temperature; T 4,L The minimum temperature threshold for the waste heat recovery drive motor is preset; T 0,H To obtain the highest single-cell temperature of the power battery module, T 0,L T3 is the lowest single-cell temperature of the power battery module; T4 is the ambient temperature outside the vehicle; and T5 is the temperature of the drive motor.

[0015] The present invention also provides an electric vehicle, including the above-described power battery thermal management system for the electric vehicle.

[0016] The present invention provides a power battery temperature control system, thermal management system and control method for electric vehicles, which can solve the problems of electric vehicles being unable to charge and discharge normally in cold regions and the significant reduction in driving range. It takes into account both the winter insulation and summer heat dissipation of the power battery, achieves efficient control of the power battery temperature under all-year operating conditions, and improves the safety and driving range performance of electric vehicles. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the structure of the power battery thermal management system for electric vehicles provided by the present invention;

[0019] Figure 2 is a flowchart illustrating a control method for a power battery temperature control system of an electric vehicle provided by the present invention.

[0020] Figure 3 is a schematic diagram of the control method of the power battery temperature control system for electric vehicles provided by the present invention.

[0021] Figure label:

[0022] 1: Power battery pack; 11: Power battery pack housing; 12: Power battery module; 13: Power battery heat exchange device; 14: Circulating medium inlet; 15: Circulating medium outlet; 2: Insulation layer; 3: Circulating medium loop; 4: Temperature control component; 41: Temperature control device; 42: Waste heat source; 43: Natural cold source; 44: First valve; 45: Second valve; 46: Third valve; 47: Fourth valve; 48: Fifth valve; 49: First circulating pump; 410: Second circulating pump; 5: Control module; 6: First channel; 7: Second channel; 8: Third channel. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] The following description, in conjunction with Figures 1-3, describes a power battery temperature control system, thermal management system, and control method for an electric vehicle according to the present invention.

[0025] Currently, with the gradual depletion of fossil fuels such as oil, the application of electric vehicles is becoming increasingly widespread. As the power source for electric vehicles, the performance of the power battery directly affects the overall vehicle performance. The lifespan and performance of power batteries are greatly affected by different regions and ambient temperatures. For example, during charging and discharging at high temperatures, the rate of irreversible reaction formation inside the battery accelerates. This irreversible reaction leads to a reduction in the battery's usable capacity, affecting its lifespan. Conversely, during charging and discharging at low temperatures, the battery's internal resistance increases, resulting in reduced charging and discharging efficiency, decreased discharge capacity, and lower battery output voltage. This affects the normal operation of the load and can also damage the battery itself. Therefore, the development of temperature control systems for electric vehicle power batteries is of significant importance and value.

[0026] Please refer to Figure 1, which is a schematic diagram of the structure of the power battery thermal management system for electric vehicles provided by the present invention.

[0027] This invention provides a power battery temperature control system for an electric vehicle, comprising: an insulation layer 2 disposed outside a power battery pack 1 for insulating the power battery pack 1; a circulating medium loop 3 connected to the power battery pack 1; a temperature control component 4 disposed on a pipeline of the circulating medium loop 3 for controlling the circulating medium to circulate between the temperature control device and the power battery pack 1 through the circulating medium loop 3; a temperature detection module for detecting the temperature of the power battery pack 1; and a control module 5 for controlling the temperature control component 4 to regulate the temperature of the power battery pack 1 according to the temperature of the power battery pack 1.

[0028] Considering the temperature control requirements under different operating conditions throughout the year, this invention provides a power battery temperature control system for electric vehicles. An insulation layer 2 is provided on the outside of the power battery pack 1, and a circulating medium loop 3 connected to the power battery pack 1 is also provided. A temperature control component is connected to the circulating medium loop 3, which can control the circulation of the circulating medium between the temperature control device and the power battery pack 1. A temperature detection module (not shown in the figure) can detect the temperature of the power battery pack 1. The control module 5 can control the temperature control component 4 based on the detected temperature of the power battery pack 1, thereby regulating the temperature of the power battery pack 1 to maintain it within a suitable temperature range, improving performance, reducing damage, and extending lifespan. The temperature detection module can be a temperature sensor. For example, when the temperature detection module detects that the temperature of the power battery pack 1 is higher than a preset temperature threshold, the control module 5 controls the temperature control component 4 to operate in cooling mode, thereby lowering the temperature of the circulating medium and thus reducing the temperature of the power battery pack 1 to a suitable temperature range; when the temperature detection module detects that the temperature of the power battery pack 1 is lower than the preset temperature threshold, the control module 5 controls the temperature control component 4 to operate in heating mode, thereby raising the temperature of the circulating medium and thus raising the temperature of the power battery pack 1 to a suitable temperature range.

[0029] Furthermore, the flow direction of the circulating medium in the circulating medium circuit 3 can be either clockwise or counterclockwise, depending on the installation direction of the circulating pump. This invention does not impose any particular limitation on this.

[0030] This invention takes into account both winter insulation and summer heat dissipation of the power battery, which can meet the temperature control requirements of the power battery under year-round operating conditions and has low system energy consumption. It improves the safety and range performance of electric vehicles and solves the problem that electric vehicles cannot charge and discharge normally in cold regions and the range is greatly reduced.

[0031] Based on the above embodiments:

[0032] In a preferred embodiment, the temperature control component 4 includes a temperature control device 41, which is an electric heating device and a single-cooling vapor compression refrigeration cycle device or a heat pump vapor compression refrigeration cycle device.

[0033] To reduce the energy consumption of the system, in this embodiment, the temperature control component 4 can be a temperature regulating device 41, such as an electric heating device and a single-cooling vapor compression refrigeration cycle device. The electric heating device can heat the circulating medium, and the single-cooling vapor compression refrigeration cycle device can cool the circulating medium. Alternatively, an electric heating device and a heat pump type vapor compression refrigeration cycle device can be used, which can both heat and cool the circulating medium. The overall device has a simple structure, occupies less space, is reliable in operation, and has low energy consumption.

[0034] To further reduce the energy consumption of the system operation, as a preferred embodiment, the temperature control component 4 also includes: a waste heat source 42, used to recover and heat the power battery pack when the temperature of the waste heat source is higher than a preset temperature threshold; and a natural cold source 43, used to naturally cool and dissipate heat from the power battery when the ambient temperature is lower than a preset temperature threshold.

[0035] Of course, the temperature of the power battery can also be controlled by combining the temperature control device 41. The system is highly flexible and practical, enhances the battery's adaptability to the environment, extends the battery's service life, and can further realize the efficient operation of the system under different working conditions, reduce the operating energy consumption of the power battery temperature control system, and improve the vehicle's range performance.

[0036] In a preferred embodiment, the system further includes a first channel 6, a second channel 7, and a third channel 8 connected in parallel on the circulating medium circuit 3; the temperature control component 4 further includes: a first valve 44 disposed on the connecting pipe between the first channel 6 and the circulating medium circuit 3; a second valve 45 disposed on the connecting pipe between the second channel 7 and the circulating medium circuit 3; a third valve 46 disposed on the connecting pipe between the third channel 8 and the circulating medium circuit 3; a fourth valve 47 and a fifth valve 48 disposed on the pipe between the first channel 6 and the second channel 7; a first circulation pump 49 disposed on the pipe between the power battery pack 1 and the first channel 6; and a second circulation pump 410 disposed on the pipe between the second channel 7 and the third channel 8.

[0037] In a preferred embodiment, the waste heat source 42 is a drive motor, which is installed on the second channel 7 and is used to exchange heat with the circulating medium in the second channel 7; the natural cold source 43 is an air-cooled heat exchanger, which is installed on the third channel 8 and is used to drive the ambient air outside the vehicle to flow through the air-cooled heat exchanger and exchange heat with the circulating medium in the third channel 8.

[0038] In this embodiment, multiple heat and cold sources, including waste heat source 42 and natural cold source 43, can be fully utilized. When the ambient temperature is low, the battery is cooled by natural cooling. When the temperature of the waste heat source is high, the battery is heated by waste heat recovery. The waste heat source 42 can be a drive motor, and the heat generated by the drive motor is recovered and exchanged with the circulating medium in the second channel 7. The natural cold source 43 can be an air-cooled heat exchanger, and the ambient air is flowed through the air-cooled heat exchanger to exchange heat with the circulating medium in the third channel 8. Combined with the temperature control device 41, the system can achieve efficient operation under varying working conditions, reduce the operating energy consumption of the power battery temperature control system, and improve the vehicle's range performance.

[0039] As a preferred embodiment, the insulation layer 2 can be made of thermal insulation material, which can completely or partially cover the power battery pack 1, the circulating medium inlet 14 and the circulating medium outlet 15. The insulation layer 2 can be a detachable structure outside the power battery pack 1, so that the power battery can be kept warm in winter and can be removed from the power battery pack 1 in summer to dissipate heat from the power battery pack 1 and reduce the risk of thermal runaway.

[0040] In addition, the insulation layer 2 can also be a fixed structure on the outside of the power battery pack 1, and the present invention does not make any special limitation here.

[0041] The system of the present invention weakens the heat exchange between the battery and the low-temperature environment under low-temperature conditions through the insulation layer 2, thereby reducing the heat loss of the battery and reducing the heating requirement of the battery. It also achieves active control of battery temperature by exchanging heat with the battery through a high-temperature circulating medium. Under high-temperature conditions, it achieves active control of battery temperature by exchanging heat with the battery through a low-temperature circulating medium, thereby avoiding the influence of the insulation structure on battery heat dissipation and improving battery safety performance.

[0042] The present invention also provides a power battery system for an electric vehicle, including the above-mentioned power battery temperature control system for an electric vehicle, and further including a power battery pack 1 with a housing space; the power battery pack 1 includes: a power battery pack shell 11 disposed outside the housing space; a power battery module 12 disposed inside the housing space and a power battery heat exchange device 13; the power battery module 12 includes a plurality of power battery cells; the power battery heat exchange device 13 is connected to the circulating medium circuit 3 through a circulating medium inlet 14 and a circulating medium outlet 15.

[0043] Specifically, the power battery pack 1 includes a power battery pack housing 11, a power battery module 12, and a power battery heat exchange device 13. The power battery module 12 includes multiple power battery cells. The power battery pack housing 11 can protect the power battery module 12 and the power battery heat exchange device 13. The power battery heat exchange device 13 is connected to the circulating medium loop 3 through the circulating medium inlet 14 and the circulating medium outlet 15 to realize heat exchange between the power battery and the circulating medium.

[0044] Furthermore, the control module 5 and the temperature detection module can be located inside or outside the housing cavity of the power battery pack 1, and the present invention does not impose any particular limitation on them.

[0045] The power battery heat exchange device 13 can be any type of heat exchange component and can be arranged at least one of the upper surface, lower surface, side surface of the battery module and between the battery cells. The present invention does not make any particular limitation.

[0046] For an introduction to the power battery system for an electric vehicle provided by the present invention, please refer to the above embodiment of the power battery temperature control system for electric vehicles. The present invention will not be described again here.

[0047] Please refer to Figure 2, which is a flowchart illustrating a control method for a power battery temperature control system of an electric vehicle provided by the present invention.

[0048] Please refer to Figure 3, which is a schematic diagram of the control method of the power battery temperature control system for electric vehicles provided by the present invention.

[0049] The present invention also provides a control method for a power battery temperature control system of an electric vehicle, comprising:

[0050] 201: Determine the vehicle status, the temperature of the power battery pack 1, the ambient temperature outside the vehicle, and the temperature of the drive motor;

[0051] 202: Determine the operating mode of the temperature control component 4 based on the vehicle status, the temperature of the power battery pack 1, the ambient temperature outside the vehicle, and the temperature of the drive motor.

[0052] As a preferred embodiment of the operating mode, it includes: when the vehicle is in a charging or driving state and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3 <T 3,H When the air-cooled heat exchanger is in charging or driving state, the fan, third valve 46, fourth valve 47, and fifth valve 48 are turned on; 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in a charging or driving state and T 0,L <T 2,L And T4≤T 4,L At that time, or when the vehicle is in a pre-start state and T0,L <T 2,L At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in parked state and T 0,L <T 1,L At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3≥T 3,H When the vehicle is in charging or driving state and T 0,L <T 2,L And T4 > T 4,L When the vehicle is in charging or driving state and T... 0,L ≥T 2,L And T 0,H ≤T 2,H At that time, or when the vehicle is in a pre-start state and T 0,L ≥T 2,L And T 0,H ≤T 2,H At that time, or when the vehicle is in parked state and T 0,L ≥T 1,L And T 0,H ≤T 1,H When T is not running; 1,H To preset the maximum threshold temperature of the power battery during vehicle parking, T 1,L To preset the minimum threshold temperature of the power battery during vehicle parking; T 2,H T is the preset maximum temperature threshold of the power battery during vehicle charging or driving. 2,L The minimum threshold temperature of the power battery during vehicle charging or driving is preset; T 3,H To preset the maximum threshold for natural cooling of outdoor ambient temperature; T 4,L The minimum temperature threshold for the waste heat recovery drive motor is preset; T 0,H To obtain the highest single-cell temperature of the power battery module 12, T 0,L T1 is the lowest single-cell temperature of the power battery module 12; T2 is the ambient temperature outside the vehicle; T3 is the temperature of the drive motor.

[0053] Specifically, in step S11, when the vehicle status is parked, proceed to step S21;

[0054] Step S12: When the vehicle status is pre-start, proceed to step S22;

[0055] Step S13: When the vehicle status is charging or driving, proceed to step S23.

[0056] Step S21, T 0,H T 0,L With T 1,H T 1,L Compare and determine the temperature control requirements of the power battery, when T 0,L <T 1,L The result is determined to be a single heating cycle, proceeding to step S31; when T 0,H >T 1,H If the result is a single cooling cycle, proceed to step S32; otherwise, if the result is no temperature control required, the system will not run, and the process will end.

[0057] Step S22, T 0,H T 0,L With T 2,H T 2,L Compare and determine the temperature control requirements of the power battery, when T 0,L <T 2,L The result is determined to be a single heating cycle, proceeding to step S31; when T 0,H >T 2,H If the result is a single cooling cycle, proceed to step S32; otherwise, if the result is no temperature control required, the system will not run, and the process will end.

[0058] Step S23, T 0,H T 0,L With T 2,H T 2,L Compare and determine the temperature control requirements of the power battery, when T 0,L <T 2,L The determination result is continuous heating, proceed to step S33; when T 0,H >T 2,H If the result indicates continuous cooling, proceed to step S34; otherwise, if the result indicates no temperature control is required, the system will not run, and the process will end.

[0059] Step S31: Open the temperature control device 41 and the first valve 44 to heat the power battery to T. 2,L End the process;

[0060] Step S32, when T3 <T 3,H Turn on the fan of the air-cooled heat exchanger, the third valve 46, the fourth valve 47, and the fifth valve 48; otherwise, turn on the temperature regulating device 41 and the first valve 44 to reduce the power battery temperature to T. 2,H End the process;

[0061] Step S33, when T4 > T 4,L Open the second valve 45, the fourth valve 47, and the fifth valve 48; otherwise, open the temperature regulating device 41 and the first valve 44 to control the power battery temperature at T.2,L To T 2,H Within the specified range, the process ends;

[0062] Step S34, when T3 <T 3,H Turn on the fan of the air-cooled heat exchanger, the third valve 46, the fourth valve 47, and the fifth valve 48; otherwise, turn on the temperature control device 41 and the first valve 44 to control the power battery temperature at T. 2,L To T 2,H Within the specified range, the process ends.

[0063] Furthermore, the vehicle status can be determined based on vehicle control signals, and this invention does not impose any particular limitations on this.

[0064] For a description of the control method of the power battery temperature control system for electric vehicles provided by the present invention, please refer to the above embodiment of the power battery temperature control system for electric vehicles. The present invention will not be described again here.

[0065] The present invention also provides an electric vehicle, including a power battery thermal management system for the electric vehicle.

[0066] For an introduction to the electric vehicle provided by this invention, please refer to the above embodiment of the power battery temperature control system for electric vehicles. This invention will not be described in detail here.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a power battery temperature control system of an electric vehicle, characterized in that, The power battery temperature control system of an electric vehicle includes: an insulation layer (2) disposed outside the power battery pack (1) for insulating the power battery pack (1); a circulating medium loop (3) connected to the power battery pack (1); a temperature control component (4) disposed on the pipeline of the circulating medium loop (3) for controlling the circulating medium to circulate between the temperature control component (4) and the power battery pack (1) through the circulating medium loop (3); a temperature detection module for detecting the temperature of the power battery pack (1); and a control module (5) for controlling the temperature control component (4) according to the temperature of the power battery pack (1) to regulate the temperature of the power battery pack (1); the control method includes: determining the vehicle state, the temperature of the power battery pack (1), the ambient temperature outside the vehicle, and the temperature of the drive motor; determining the working mode of the temperature control component (4) according to the vehicle state, the temperature of the power battery pack (1), the ambient temperature outside the vehicle, and the temperature of the drive motor; the working mode of the temperature control component (4) includes: when the vehicle state is charging or driving and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3 <T 3,H At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3 <T 3,H When the air-cooled heat exchanger is in a charging or driving state, the fan, third valve (46), fourth valve (47), and fifth valve (48) are turned on; 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in a charging or driving state and T 0,L <T 2,L And T4≤T 4,L At that time, or when the vehicle is in a pre-start state and T 0,L <T 2,L At that time, or when the vehicle is in a pre-start state and T 0,H >T 2,H And T3≥T 3,H At that time, or when the vehicle is in parked state and T 0,L <T 1,L At that time, or when the vehicle is in parked state and T 0,H >T 1,H And T3≥T 3,H When the vehicle is in charging or driving state and T 0,L <T 2,L And T4>T 4,L When the vehicle is in a charging or driving state and T 0,L ≥T 2,L And T 0,H ≤T 2,H At that time, or when the vehicle is in a pre-start state and T 0,L ≥T 2,L And T 0,H ≤T 2,H At that time, or when the vehicle is in parked state and T 0,L ≥T 1,L And T 0,H ≤T 1,H When T is not running, the system does not operate; among them, T 1,H To preset the maximum threshold temperature of the power battery during vehicle parking, T 1,L To preset the minimum threshold temperature of the power battery during vehicle parking; T 2,H T is the preset maximum temperature threshold of the power battery during vehicle charging or driving. 2,L The minimum threshold temperature of the power battery during vehicle charging or driving is preset; T 3,H To preset the maximum threshold for natural cooling of outdoor ambient temperature; T 4,L The minimum temperature threshold for the waste heat recovery drive motor is preset; T 0,H To obtain the highest single-cell temperature of the power battery module (12), T 0,L T3 is the lowest single-cell temperature of the power battery module (12); T4 is the ambient temperature outside the vehicle; and T5 is the temperature of the drive motor.

2. The control method for the power battery temperature control system of an electric vehicle according to claim 1, characterized in that, The temperature control component (4) includes a temperature control device (41), which is an electric heating device and a single-cooling vapor compression refrigeration cycle device or a heat pump vapor compression refrigeration cycle device.

3. The control method for the power battery temperature control system of an electric vehicle according to claim 2, characterized in that, The temperature control component (4) further includes: a waste heat source (42) for recovering and heating the power battery pack (1) when the temperature of the waste heat source is higher than the preset temperature threshold; and a natural cold source (43) for naturally cooling the power battery pack (1) when the ambient temperature is lower than the preset temperature threshold.

4. The control method for the power battery temperature control system of an electric vehicle according to claim 3, characterized in that, It also includes a first channel (6), a second channel (7), and a third channel (8) connected in parallel on the circulating medium circuit (3); the temperature control component (4) further includes: a first valve (44) disposed on the connecting pipe between the first channel (6) and the circulating medium circuit (3); a second valve (45) disposed on the connecting pipe between the second channel (7) and the circulating medium circuit (3); a third valve (46) disposed on the connecting pipe between the third channel (8) and the circulating medium circuit (3); a fourth valve (47) and a fifth valve (48) disposed on the pipe between the first channel (6) and the second channel (7); a first circulation pump (49) disposed on the pipe between the power battery pack (1) and the first channel (6); and a second circulation pump (410) disposed on the pipe between the second channel (7) and the third channel (8).

5. The control method for the power battery temperature control system of an electric vehicle according to claim 4, characterized in that, The waste heat source (42) is a drive motor, which is installed on the second channel (7) and is used to exchange heat with the circulating medium in the second channel (7); the natural cold source (43) is an air-cooled heat exchanger, which is installed on the third channel (8) and is used to drive the ambient air outside the vehicle to flow through the air-cooled heat exchanger and exchange heat with the circulating medium in the third channel (8).

6. The control method for the power battery temperature control system of an electric vehicle according to any one of claims 1 to 5, characterized in that, The insulation layer (2) is detachably wrapped around the outside of the power battery pack (1).

7. A power battery thermal management system for an electric vehicle, characterized in that, The thermal management system operates the control method of the power battery temperature control system of the electric vehicle according to any one of claims 1 to 6. The thermal management system includes the power battery temperature control system of the electric vehicle and also includes a power battery pack (1) with a housing space. The power battery pack (1) includes: a power battery pack shell (11) disposed outside the housing space; a power battery module (12) and a power battery heat exchange device (13) disposed inside the housing space; the power battery module (12) includes multiple power battery cells; the power battery heat exchange device (13) is connected to the circulating medium loop (3) through a circulating medium inlet (14) and a circulating medium outlet (15).

8. An electric vehicle, characterized in that, Including the power battery thermal management system for electric vehicles as described in claim 7.

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