CN115946496A - New energy automobile battery thermal management control method - Google Patents
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- CN115946496A CN115946496A CN202211703577.XA CN202211703577A CN115946496A CN 115946496 A CN115946496 A CN 115946496A CN 202211703577 A CN202211703577 A CN 202211703577A CN 115946496 A CN115946496 A CN 115946496A
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Abstract
The invention discloses a new energy automobile battery thermal management control method, which has the main design concept that a power battery thermal management comprehensive control strategy through a motor and electronic control waste heat recovery is provided, so that when a low-temperature driving is heated, the waste heat recovery of the motor and a multi-in-one power distribution box is carried out, the power battery is heated, the driving heating power consumption is reduced, and the vehicle endurance mileage is increased; and the driving heating cut-off temperature threshold can be set according to the temperature of the battery standing in the environment instead of the driving heating cut-off according to the fixed threshold, so that the energy is saved, and the driving mileage of the vehicle is improved. In addition, in spring and autumn, when the power battery needs to dissipate heat, the radiator is started to dissipate heat preferentially, power consumption generated by directly starting the battery cooler of the air conditioner is reduced, and therefore the endurance mileage of the vehicle can be increased. The invention is beneficial to reducing the energy consumption of the new energy automobile, and the endurance mileage of the pure electric vehicle is obviously increased while the low-temperature operation efficiency of the power battery is improved.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a new energy automobile battery thermal management control method.
Background
Heat management of a power battery of a new energy automobile is a key technical component of the new energy automobile. Taking an economical pure electric light-truck logistics vehicle as an example, the overall vehicle cost is sensitive, a low-cost battery heating film heating mode is generally adopted for battery thermal management, a natural cooling mode is adopted, namely when the battery needs to be charged at a low temperature (below 0 ℃), a control strategy is designed to start the heating film, the heating film is heated to 1 ℃ or above, a heating and charging mode is started, the lowest temperature of the battery is above 15 ℃, high-rate charging is carried out, a battery cooling mode is generally adopted, low-cost natural cooling is adopted, namely, a battery core is charged, discharged and heated, heat is conducted to a battery core shell, the battery core shell conducts heat to an aluminum alloy box body, the box body exchanges heat with the natural environment, the high-temperature heat dissipation efficiency is low, and the service life of a power battery is not kept favorably.
In the mode, the battery runs in an early high-temperature environment, reliable heat dissipation treatment is not available, the running temperature of the battery is close to 50 ℃, the high-temperature charging time is long, the high-temperature charging and discharging of the battery are realized, and the service life of the battery is influenced.
In addition, the prior art also comprises the steps of performing liquid heating by adopting W-ptc (with higher power, such as 6.5 kW), and cooling by adopting an air conditioner Chiller in high-temperature environment operation, namely when the battery needs to be charged at low temperature (below 0 ℃), designing a control strategy to start a heating film, heating to 1 ℃ or above, starting a heating and charging mode, and performing high-rate charging when the lowest temperature of the battery is above 15 ℃; and a battery cooling mode, namely, air conditioner Chiller cooling is adopted for heat exchange, battery circulating water is cooled by the air conditioner Chiller and then is introduced into a liquid cooling plate in the battery pack, and the liquid cooling plate is used for cooling the battery. The cooling mode can ensure that the battery pack is always in a more proper charging and discharging temperature range in a high-temperature environment, is beneficial to maintaining the service life of the battery, and has less application cases due to higher cost.
In the mode, the cost of the battery liquid cooling system is high, and when the battery liquid cooling system discharges at low temperature, the electric energy loss of the driving is large due to the high power of the configured W-ptc, and the driving mileage of the vehicle is obviously reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a new energy automobile battery thermal management control method to solve the aforementioned technical problems.
The technical scheme adopted by the invention is as follows:
the invention provides a new energy automobile battery thermal management control method, which comprises the following steps:
s0, judging the current operation stage of the battery;
the method comprises the following steps that S1, in a charging and cooling stage, when the lowest temperature of a battery is in a first preset interval and the average temperature is higher than a first preset threshold value, a radiator is used for radiating heat of the battery;
s2, in a charging and cooling stage, when the lowest temperature of the battery is higher than the upper limit of a first preset interval and the average temperature is higher than a third preset threshold value, the battery is cooled by a cooler, and the motor and the all-in-one controller use a radiator for heat dissipation;
s3, in the charging and heating stage, when the lowest temperature of the battery is lower than a fourth preset threshold and the highest temperature of the battery is lower than the lower limit of a first preset interval, starting a battery heating film for heating, and radiating heat by adopting an external radiator for the motor and the all-in-one controller;
s4, in the charging and heating stage, when the lowest temperature of the battery is in a second preset interval and the highest temperature of the battery is lower than a sixth preset threshold, the battery is closed to be heated, and the waste heat of the motor and the all-in-one controller is recycled to be used for heating the battery;
step S5, in the driving cooling stage, when the lowest temperature of the battery is higher than a seventh preset threshold and the average temperature is higher than an eighth preset threshold, a battery cooler is started, and the motor and the all-in-one controller adopt a radiator for radiating heat;
s6, in the driving cooling stage, when the lowest temperature of the battery is in a third preset interval and the average temperature is higher than a sixth preset threshold value, the battery, the motor and the all-in-one controller are cooled by using a radiator;
s7, in the heating stage of driving, when the lowest temperature of the battery is lower than a first dynamic threshold and the highest temperature of the battery is lower than a fifth preset threshold, the battery cooler is closed and the air conditioner is disabled, the motor and the all-in-one controller dissipate heat by using an external radiator, and the battery starts a heating film to heat automatically;
and S8, in the driving heating stage, when the lowest temperature of the battery is between the first dynamic threshold and the fifth preset threshold and the highest temperature of the battery is lower than the first preset threshold, the battery is heated by utilizing the waste heat of the motor.
In at least one possible implementation manner, the step S1 further includes: and when the highest temperature of the battery is lower than a first preset threshold or the average temperature is lower than a second preset threshold, the battery is closed to be cooled, and the heat radiator is used for radiating heat of the motor and the all-in-one controller.
In at least one possible implementation manner, the step S2 further includes: and turning off the battery cooler until the highest temperature of the battery is lower than the lower limit of the first preset interval or the average temperature is lower than a second preset threshold.
In at least one possible implementation manner, the step S3 further includes: and when the lowest temperature of the battery is higher than a fifth preset threshold or the highest temperature of the battery is higher than a sixth preset threshold, the battery is closed to heat, and the waste heat of the motor and the all-in-one controller is recovered to heat the battery.
In at least one possible implementation manner, the step S4 further includes: and when the lowest temperature of the battery is higher than a second preset threshold or the highest temperature of the battery is higher than a sixth preset threshold, the heating of the battery heating film is closed, the battery cooler is forbidden to be energized, and the motor and the all-in-one controller are radiated by an external radiator.
In at least one possible implementation manner, the step S5 further includes: and when the highest temperature of the battery is lower than an eighth preset threshold or the average temperature of the battery is lower than a ninth preset threshold, the battery cooler is closed, and the battery, the motor and the all-in-one controller all adopt the radiator to radiate heat.
In at least one possible implementation manner, the step S6 further includes: and (4) turning off the battery cooler and disabling the air conditioner until the highest temperature of the battery is lower than a sixth preset threshold or the average temperature is lower than the lower limit of the first preset interval, and radiating heat by using the external radiator by using the motor and the all-in-one controller.
In at least one possible implementation manner, the step S7 further includes: when the lowest temperature of the battery is higher than a second dynamic threshold or the highest temperature of the battery is higher than a first preset threshold. The battery utilizes the motor waste heat to heat.
In at least one possible implementation, the first dynamic threshold and the second dynamic threshold are both related to a battery temperature at power-up of the vehicle.
In at least one possible implementation manner, the step S8 further includes: when the lowest temperature of the battery is higher than a fifth preset threshold or the highest temperature of the battery is higher than a tenth preset threshold, the battery cooler is closed and the air conditioner is disabled, and the motor and the all-in-one controller dissipate heat by utilizing the external radiator.
The main design concept of the invention is that a power battery heat management comprehensive control strategy through a motor and electric control waste heat recovery is provided, so that when a low-temperature running vehicle is heated, the waste heat recovery of the motor and an all-in-one distribution box is carried out, the power battery is heated, the running vehicle heating power consumption is reduced, and the vehicle endurance mileage is increased; and the driving heating cut-off temperature threshold can be set according to the temperature of the battery standing in the environment instead of the driving heating cut-off according to the fixed threshold, so that the energy is saved, and the driving mileage of the vehicle is improved. In addition, in spring and autumn, when the power battery needs to dissipate heat, the radiator is started to dissipate heat preferentially, power consumption generated by directly starting the battery cooler of the air conditioner is reduced, and therefore the endurance mileage of the vehicle can be increased. The invention is beneficial to reducing the energy consumption of the new energy automobile, and the endurance mileage of the pure electric vehicle is obviously increased while the low-temperature operation efficiency of the power battery is improved.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is an architecture diagram of a new energy vehicle battery thermal management control system according to an embodiment of the present invention;
fig. 2 is a flowchart of a new energy vehicle battery thermal management control method provided in an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
The invention provides an embodiment of a battery thermal management control system of a new energy automobile, and particularly, as shown in fig. 1, the battery thermal management control system comprises:
the present invention provides the following hardware system to implement, as shown in fig. 1, the system architecture includes: the system comprises air conditioning components (such as an APTC (advanced persistent threat), an air conditioner evaporator in a cab, an EXT (extensible extra-portable) electronic expansion valve, a TXT (TXT thermal expansion valve), an electronic valve, an air conditioner condenser and a radiator outside the cab, a motor hot water loop, a water circulation loop of an all-in-one controller, a Chiller battery cooler and a super kettle integrated double-water pump device with a five-way valve, wherein in the figure, T is a water path temperature sensor, PT is a pressure temperature sensor and P is a pressure sensor;
in the system, a circulation loop mainly comprises three parts, namely a refrigerant circulation loop (comprising a battery Chiller branch), a motor, a water circulation loop of an all-in-one control box and a battery water circulation loop, wherein the two water circulation loops are connected through a super kettle (integrating a double water pump and a five-way reversing valve).
On the basis of the system architecture, at least the following five different modes can be realized:
the first mode is as follows: namely, in the initial state, the five-way valve is in communication 1-2, communication 3-4 and closed 5. The battery chiller does not operate and the EXT electronic expansion valve is disconnected. The five-way valve motor circulation loop water pump works, and the motor and the all-in-one controller utilize an external radiator to dissipate heat:
and a second mode: and (5) the five-way valve is communicated with 1-2 and 3-4, and is closed. The battery is cooled by a chiller and is opened, the air conditioner compressor works, and the EXT electronic expansion valve is opened (the opening degree is controlled by a VCU). The motor and the all-in-one controller are cooled by an external radiator;
and a third mode: 2-3 communication, 1-5 communication, 4 closing, and disconnecting the EXT electronic expansion valve, wherein the battery is heated by utilizing the waste heat of the motor, so that the battery is suitable for the low-temperature heating working condition, and a waste heat recovery control strategy is described later;
and a fourth mode: 1-4 communication, 2-3 communication, 5 closing, the EXT electronic expansion valve is disconnected, the battery and the motor are in large circulation, and the entire vehicle radiator is used for cooling the battery and cooling the motor, so that the method is suitable for the spring/autumn low-temperature quick-charging working condition, the Chiller opening time of battery cooling is reduced, the energy consumption of the vehicle is effectively reduced, and the mileage of the vehicle is promoted;
and a fifth mode: the five-way valve is communicated 1-2, communicated 3-4 and closed 5, the EXT electronic expansion valve is disconnected, the battery miller is cooled and closed, the motor and the all-in-one controller dissipate heat by using an external radiator, and the battery is started and is provided with a heating film to heat the battery.
Therefore, the invention provides a new energy automobile battery thermal management control method, as shown in fig. 2, including:
s0, judging the current operation stage of the battery (the judgment result is shown in the following);
step S1, in a charging and cooling stage, when the lowest temperature of the battery is in a first preset interval and the average temperature is higher than a first preset threshold (20), the heat of the battery is dissipated by using a radiator, and further, until the highest temperature of the battery is lower than the first preset threshold or the average temperature is lower than a second preset threshold (18), the battery is shut down for cooling, and the radiator is used for dissipating heat of the motor and the all-in-one controller;
for example, when the temperature is more than or equal to 24 ℃ and less than or equal to Tmin (the lowest temperature of the battery) and less than or equal to 27 ℃ and Tave (the average temperature of the battery) and more than or equal to 20 ℃, the heat of the battery is dissipated by using the heat dissipater until Tmax (the highest temperature of the battery) and less than or equal to 20 ℃ or Tave and less than or equal to 18 ℃ turns off the mode III, the mode I is entered, the battery is turned off for cooling, and the heat dissipater is used for motor and all-in-one cooling.
S2, in a charging and cooling stage, when the lowest temperature of the battery is higher than the upper limit (27) of a first preset interval and the average temperature is higher than a third preset threshold (25), the battery is cooled by using a cooler, the motor and the all-in-one controller use a radiator for heat dissipation, and further, the battery cooler is closed until the highest temperature of the battery is lower than the lower limit (24) of the first preset interval or the average temperature is lower than a second preset threshold (18);
for example, when Tmin (lowest temperature of battery) is greater than or equal to 27 ℃ and Tave is greater than or equal to 25 ℃, chiller cooling is started, mode two is entered, the battery is cooled by the Chiller, the motor and the all-in-one are still cooled by the radiator, and the Chller cooling is turned off until Tmax (highest temperature of battery) is less than or equal to 24 ℃ or Tave (average temperature) is less than or equal to 18 ℃, so that mode three can be entered.
S3, in the charging and heating stage, when the lowest temperature of the battery is lower than a fourth preset threshold (12) and the highest temperature of the battery is lower than the lower limit of a first preset interval, a battery heating film is started to heat, and the motor and the all-in-one controller adopt an external radiator to dissipate heat; further, when the lowest temperature of the battery is higher than a fifth preset threshold (15) or the highest temperature of the battery is higher than a sixth preset threshold (26), the battery is closed to heat, and the waste heat of the motor and the all-in-one controller is recycled to heat the battery;
for example, when the temperature Tmin (the lowest temperature of the battery) is less than or equal to 12 ℃ and the temperature Tmax is less than or equal to 24 ℃, the mode five is entered, the heating film of the battery is started for heating, the motor and the all-in-one controller use the external radiator for radiating heat, when the temperature Tmin is more than or equal to 15 or the temperature Tmax is more than or equal to 26, the mode three is entered, the battery is closed for heating, and the motor and the all-in-one waste heat are recycled for heating the battery.
S4, in a charging and heating stage, when the lowest temperature of the battery is in a second preset interval and the highest temperature of the battery is lower than a sixth preset threshold (26), the battery is closed to heat, and the waste heat of the motor and the all-in-one controller is recycled to heat the battery; further, when the lowest temperature of the battery is higher than a second preset threshold (18) or the highest temperature of the battery is higher than a sixth preset threshold (26), the heating of the battery heating film is closed, the battery cooler is disabled, and the motor and the all-in-one controller adopt an external radiator for heat dissipation;
for example, when the temperature is 12 ℃ < Tmin (the lowest temperature of the battery) is less than or equal to 18 ℃ and Tmax is less than or equal to 26 ℃, entering a third mode, turning off the heating of the battery, entering a motor, and recovering all-in-one waste heat to heat the battery; and when the Tmin is more than 18 or the Tmax is more than or equal to 26, entering a first mode, turning off the heating film of the battery for heating, turning off the Chiller for cooling the battery, and radiating heat by using an external radiator for the motor and the all-in-one controller.
S5, in a driving cooling stage, when the lowest temperature of the battery is higher than a seventh preset threshold (36) and the average temperature is higher than an eighth preset threshold (32), a battery cooler is started, and the motor and the all-in-one controller adopt a radiator for heat dissipation; further, when the highest temperature of the battery is lower than an eighth preset threshold (32) or the average temperature is lower than a ninth preset threshold, the battery cooler is closed, and the battery, the motor and the all-in-one controller are all cooled by using radiators;
for example, when Tmin (the lowest temperature of the battery) is more than or equal to 36 ℃ and Tave is more than or equal to 32 ℃, entering a mode two, turning on the Chiller cooling, radiating heat by the heat radiator for the motor and the all-in-one controller, turning off the Chller cooling until Tmax (the highest temperature of the battery) is less than or equal to 32 ℃ or Tave (the average temperature) is less than or equal to 28 ℃, entering a mode four, and radiating heat by the heat radiator for the battery, the motor and the all-in-one controller.
S6, in a driving cooling stage, when the lowest temperature of the battery is in a third preset interval and the average temperature is higher than a sixth preset threshold value, the battery, the motor and the all-in-one controller adopt a radiator to dissipate heat; further, the battery cooler is closed and the air conditioner is disabled until the highest temperature of the battery is lower than a sixth preset threshold or the average temperature is lower than the lower limit of the first preset interval, and the motor and the all-in-one controller utilize an external radiator to dissipate heat;
for example, when the temperature is more than or equal to 28 ℃ and less than or equal to Tmin (the lowest temperature of the battery) and more than or equal to 26 ℃ and the Tave is more than or equal to 26 ℃, the four mode is entered, the battery, the motor and the all-in-one radiator are used for radiating heat until Tmax (the highest temperature of the battery) and less than or equal to 26 ℃ or Tave (the average temperature) and less than or equal to 24 ℃ enters the one mode, the cooling of the battery miller is turned off, the air conditioner is not turned on, and the motor and the all-in-one controller are used for radiating heat by using an external radiator.
S7, in the heating stage of driving, when the lowest temperature of the battery is lower than a first dynamic threshold and the highest temperature of the battery is lower than a fifth preset threshold, the battery cooler is closed and the air conditioner is disabled, the motor and the all-in-one controller dissipate heat by using an external radiator, and the battery starts a heating film to heat automatically; further, when the lowest temperature of the battery is higher than a second dynamic threshold or the highest temperature of the battery is higher than a first preset threshold. The battery is heated by utilizing the waste heat of the motor;
for example, when Tmin (battery minimum temperature). Ltoreq.T 1 and Tmax. Ltoreq.15 ℃, enter mode five, battery chiller is turned off, and the air conditioner is not turned on. The motor and the all-in-one controller use an external radiator to dissipate heat, the battery is started to be provided with a heating film to heat the battery, when Tmin is larger than or equal to T2 or Tmax is larger than or equal to 20 ℃, the mode III is entered, and the battery uses the residual heat of the motor to heat.
S8, in a driving heating stage, when the lowest temperature of the battery is between a first dynamic threshold and a fifth preset threshold and the highest temperature of the battery is lower than the first preset threshold, the battery is heated by utilizing the waste heat of the motor; further, when the lowest temperature of the battery is higher than a fifth preset threshold or the highest temperature of the battery is higher than a tenth preset threshold, the battery cooler is closed and the air conditioner is disabled, and the motor and the all-in-one controller dissipate heat by utilizing the external radiator;
for example, when T1 < Tmin (the lowest temperature of the battery) is less than or equal to 15 ℃ and Tmax is less than or equal to 20 ℃, entering a third mode, and heating the battery by using the waste heat of the motor; and when the Tmin is more than or equal to 15 ℃ or the Tmax is more than or equal to 30 ℃, entering a mode I, cooling and closing the battery miller, and not starting the air conditioner. The motor and the all-in-one controller utilize an external radiator to dissipate heat.
Finally, it can be stated that the first dynamic threshold and the second dynamic threshold are both related to the temperature of the vehicle at power-on, and different dynamic thresholds can be set in advance according to different battery temperatures at power-on (preferably, a table is formed to facilitate the table look-up operation).
In summary, the main design concept of the invention is to provide a power battery thermal management comprehensive control strategy through a motor and electronic control waste heat recovery, so that when a low-temperature vehicle is heated, the waste heat recovery of the motor and an all-in-one distribution box is carried out, the power battery is heated, the vehicle heating power consumption is reduced, and the vehicle endurance mileage is increased; and the driving heating cut-off temperature threshold can be set according to the temperature of the battery standing in the environment instead of the driving heating cut-off according to the fixed threshold, so that the energy is saved, and the driving mileage of the vehicle is improved. In addition, in spring and autumn, when the power battery needs to dissipate heat, the radiator is started to dissipate heat preferentially, power consumption generated by directly starting the battery cooler of the air conditioner is reduced, and therefore the endurance mileage of the vehicle can be increased. The invention is beneficial to reducing the energy consumption of the new energy automobile, and the endurance mileage of the pure electric vehicle is obviously increased while the low-temperature operation efficiency of the power battery is improved.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.
Claims (10)
1. A new energy automobile battery thermal management control method is characterized by comprising the following steps:
s0, judging the current operation stage of the battery;
step S1, in a charging and cooling stage, when the lowest temperature of a battery is in a first preset interval and the average temperature is higher than a first preset threshold value, a radiator is used for radiating heat of the battery;
s2, in a charging and cooling stage, when the lowest temperature of the battery is higher than the upper limit of a first preset interval and the average temperature of the battery is higher than a third preset threshold value, the battery is cooled by a cooler, and the motor and the all-in-one controller are cooled by a radiator;
s3, in the charging and heating stage, when the lowest temperature of the battery is lower than a fourth preset threshold and the highest temperature of the battery is lower than the lower limit of a first preset interval, starting a battery heating film for heating, and radiating heat by adopting an external radiator for the motor and the all-in-one controller;
s4, in the charging and heating stage, when the lowest temperature of the battery is in a second preset interval and the highest temperature of the battery is lower than a sixth preset threshold, the battery is closed to be heated, and the waste heat of the motor and the all-in-one controller is recycled to be used for heating the battery;
step S5, in a driving cooling stage, when the lowest temperature of the battery is higher than a seventh preset threshold and the average temperature of the battery is higher than an eighth preset threshold, a battery cooler is started, and the motor and the all-in-one controller adopt a radiator for radiating heat;
s6, in the driving cooling stage, when the lowest temperature of the battery is in a third preset interval and the average temperature is higher than a sixth preset threshold value, the battery, the motor and the all-in-one controller are cooled by using a radiator;
s7, in the heating stage of driving, when the lowest temperature of the battery is lower than a first dynamic threshold and the highest temperature of the battery is lower than a fifth preset threshold, the battery cooler is closed and the air conditioner is disabled, the motor and the all-in-one controller dissipate heat by using an external radiator, and the battery starts a heating film to heat automatically;
and S8, in the driving heating stage, when the lowest temperature of the battery is between the first dynamic threshold and the fifth preset threshold and the highest temperature of the battery is lower than the first preset threshold, the battery is heated by utilizing the waste heat of the motor.
2. The new energy automobile battery thermal management control method according to claim 1, wherein the step S1 further comprises: and when the highest temperature of the battery is lower than a first preset threshold or the average temperature is lower than a second preset threshold, the battery is closed to be cooled, and the heat radiator is used for radiating heat of the motor and the all-in-one controller.
3. The new energy automobile battery thermal management control method according to claim 1, wherein the step S2 further comprises: and turning off the battery cooler until the highest temperature of the battery is lower than the lower limit of the first preset interval or the average temperature is lower than a second preset threshold.
4. The new energy automobile battery thermal management control method according to claim 1, wherein the step S3 further comprises: and when the lowest temperature of the battery is higher than a fifth preset threshold or the highest temperature of the battery is higher than a sixth preset threshold, the battery is closed to heat, and the waste heat of the motor and the all-in-one controller is recovered to heat the battery.
5. The new energy automobile battery thermal management control method according to claim 1, wherein the step S4 further comprises: and when the lowest temperature of the battery is higher than a second preset threshold or the highest temperature of the battery is higher than a sixth preset threshold, the heating of the battery heating film is closed, the battery cooler is forbidden to be energized, and the motor and the all-in-one controller are radiated by an external radiator.
6. The new energy automobile battery thermal management control method according to claim 1, wherein the step S5 further comprises: and when the highest temperature of the battery is lower than an eighth preset threshold or the average temperature of the battery is lower than a ninth preset threshold, the battery cooler is closed, and the battery, the motor and the all-in-one controller are all cooled by adopting the radiator.
7. The new energy automobile battery thermal management control method according to claim 1, wherein the step S6 further comprises: and when the highest temperature of the battery is lower than a sixth preset threshold or the average temperature of the battery is lower than the lower limit of the first preset interval, the battery cooler is closed, the air conditioner is disabled, and the motor and the all-in-one controller are used for radiating heat by using the external radiator.
8. The new energy automobile battery thermal management control method according to claim 1, wherein the step S7 further includes: when the lowest temperature of the battery is higher than a second dynamic threshold or the highest temperature of the battery is higher than a first preset threshold. The battery utilizes the motor waste heat to heat.
9. The new energy automobile battery thermal management control method according to claim 8, wherein the first dynamic threshold and the second dynamic threshold are related to a battery temperature when a vehicle is powered on.
10. The new energy automobile battery thermal management control method according to any one of claims 1 to 9, wherein the step S8 further includes: when the lowest temperature of the battery is higher than a fifth preset threshold or the highest temperature of the battery is higher than a tenth preset threshold, the battery cooler is closed and the air conditioner is disabled, and the motor and the all-in-one controller dissipate heat by utilizing the external radiator.
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