Battery thermal management method and device

Abstract

The invention discloses a battery thermal management method and device, the battery thermal management method is applied to a hovercar comprising an aircraft battery and a car battery, and the battery thermal management method comprises the following steps: obtaining a first full charge time of the car battery; determining a thermal management moment of the aircraft battery based on the take-off time of the hovercar and the first full charge time; and adjusting the temperature of the aircraft battery to a preset target temperature according to the thermal management moment, and reducing the power consumption of the aircraft battery.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular, to a battery thermal management method and device. Background Art

[0002] In order to solve the problem of increasingly busy road traffic congestion and jam, the development of flying cars has been born. More and more countries have begun to include the development of flying cars in their future development plans. With the research and development of flying cars, more and more flying cars with different styles have come out. Among them, the land-air split flying car, as an amphibious flying car, has become an important research and development field.

[0003] The flying car with land-air separation has the characteristic of flying by means of an aircraft, and the battery discharge power of the aircraft is large and the duration is long during the flight. In actual work, the high-power discharge process of the battery will cause the temperature of the battery to rise quickly, resulting in the battery of the aircraft being unable to be within the operating temperature range during the flight, causing great damage to the safety of the battery.

[0004] Furthermore, at the beginning of the flight, the aircraft needs the aircraft battery to provide current to the thermal management circuit and consume power, and then the flight battery is heated or cooled through the thermal management circuit, which not only causes power consumption of the flight battery but also requires a certain amount of pre-flight preparation time. Summary of the invention

[0005] In order to solve the above technical problems, the present application discloses a battery thermal management method and device for reducing the power consumption of aircraft batteries.

[0006] In order to achieve the above objectives, the present application discloses a battery thermal management method, which is applied to a flying car including an aircraft battery and a car battery. The battery thermal management method includes:

[0007] Obtaining a first full-charge time of the vehicle battery;

[0008] Determining a thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time;

[0009] The temperature of the aircraft battery is adjusted to a preset target temperature according to the thermal management time.

[0010] The present application discloses a battery thermal management method, which is applied to a flying car equipped with an aircraft battery and a car battery. The first full charge time of the car battery is obtained, and the thermal management time for the flying car to adjust the temperature is determined according to the first full charge time and the take-off time of the flying car. The temperature of the aircraft battery is adjusted according to the thermal management time, so that the temperature of the aircraft battery is adjusted before the take-off time, so as to avoid the aircraft battery consuming power to adjust its own temperature during the flight of the flying car, thereby reducing the power consumption of the aircraft battery.

[0011] In one embodiment, determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time includes:

[0012] Acquire a first state of charge of the vehicle battery, and compare the first state of charge with a preset state of charge threshold;

[0013] When the first state of charge is greater than the state of charge threshold, the thermal management time of the aircraft battery is calculated according to the first full-charge time and a preset first thermal management duration.

[0014] In this embodiment, when the first state of charge is greater than the state of charge threshold, it is determined that the car battery will be fully charged soon. At this time, in order to utilize an external charging power source to heat or cool the battery, the thermal management time is formulated according to the full charging time of the car battery to ensure that the temperature of the aircraft battery is adjusted before the car battery is fully charged to avoid power consumption of the aircraft battery.

[0015] In one embodiment, the determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full charge time further includes:

[0016] When the first state of charge is less than or equal to the state of charge threshold, calculating a first time difference between the first full charge time and the flight time;

[0017] Comparing the first time difference with a preset first duration threshold;

[0018] When the first time difference is less than or equal to the first duration threshold, the thermal management time of the aircraft battery is calculated according to the take-off time and a preset second thermal management duration.

[0019] In this embodiment, after determining that the second state of charge is less than the state of charge threshold, it is determined that the car battery needs a longer charging time. In this case, the time difference between the car battery and the take-off time is obtained to ensure that the thermal management time is before the car is fully charged based on the time difference, so as to achieve temperature regulation of the aircraft battery during the charging process of the flying car.

[0020] In one embodiment, the determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full charge time further includes:

[0021] When the first time difference is greater than the first time threshold, the charging operation of the vehicle battery is completed according to the first full-charging time.

[0022] In this embodiment, when it is determined that the first time difference is greater than the first time threshold, it is determined that the car is fully charged a long time before the take-off time. In order to avoid the temperature of the aircraft battery changing during the waiting time and causing a waste of power, the charging operation is directly completed and the management process of the aircraft battery is stopped.

[0023] In one embodiment, before obtaining the first full charge time of the vehicle battery, the method includes:

[0024] Obtaining a second full-charge time of the aircraft battery, and calculating a second time difference between the second full-charge time and the take-off time;

[0025] Comparing the second time difference with a preset second duration threshold;

[0026] It is determined that the second time difference is greater than the second duration threshold.

[0027] In this embodiment, before obtaining the full charge time of the car battery, the full charge time of the aircraft battery is first obtained, and the time difference between the full charge time and the take-off time is calculated, and the second time threshold is set to ensure that there is time to perform thermal management on the aircraft battery.

[0028] In one embodiment, before obtaining the first full charge time of the vehicle battery, the method includes:

[0029] When the second time difference is less than or equal to the second duration threshold, the thermal management time of the aircraft battery is calculated according to the take-off time and a preset third thermal management duration.

[0030] In this embodiment, after determining that there is only a short time between the aircraft battery being fully charged and the take-off time, the aircraft battery is temperature-regulated before the take-off time based on the third thermal management time to ensure that the aircraft battery is heated or cooled in advance before the flight plan.

[0031] In one embodiment, before calculating the second time difference between the second full-charge time and the take-off time, the method includes:

[0032] comparing the second full-charge time with the take-off time;

[0033] It is determined that the second full-charging time is less than the take-off time.

[0034] In this implementation, based on comparing the second full-charge time with the take-off time, it is ensured that sufficient charging support is provided to the aircraft battery.

[0035] In one embodiment, before calculating the second time difference between the second full-charge time and the take-off time, the method includes:

[0036] When the second full-charge time is greater than or equal to the take-off time, comparing the temperature of the aircraft battery with a preset first temperature threshold and a second temperature threshold;

[0037] When the temperature of the aircraft battery is greater than or equal to the first temperature threshold or the temperature of the aircraft battery is less than or equal to the first temperature threshold, adjusting the temperature of the aircraft battery to a first temperature;

[0038] updating the second full charge time of the aircraft battery to a third full charge time according to the first temperature, and comparing the third full charge time with the take-off time;

[0039] It is determined that the third full-charging time is less than the take-off time.

[0040] In this embodiment, after determining that the aircraft battery cannot be charged before the take-off time, it is determined whether the current temperature of the aircraft battery is too high or too low, and the temperature of the battery is adjusted in time to ensure the charging of the aircraft battery.

[0041] In one embodiment, adjusting the temperature of the aircraft battery to a preset target temperature according to the thermal management time comprises:

[0042] activating a thermal management loop of the aircraft battery according to the thermal management moment;

[0043] determining a regulating current corresponding to the thermal management loop according to the target temperature and a third state of charge of the aircraft battery at the thermal management moment;

[0044] During the takeoff time, the regulating current is sent to the thermal management loop to adjust the temperature of the aircraft battery to the target temperature through the thermal management loop; wherein the target temperature is the temperature of the aircraft battery under discharge power.

[0045] In this embodiment, the target temperature of the aircraft battery is determined based on the discharge power of the aircraft battery, so as to ensure that the aircraft battery is within the operating temperature range when the flying car takes off according to the take-off time. It is not necessary to consume the power of the flight battery to adjust the temperature of the aircraft battery, and at the same time, it is ensured that the power output is normal during flight, thus saving pre-flight preparation time.

[0046] On the other hand, the present application discloses a battery thermal management device, which is applied to a flying car including an aircraft battery and a car battery, wherein the battery thermal management device includes a charging time module, a thermal management time calculation module, and a temperature control module;

[0047] The charging time module is used to obtain the first full charging time of the vehicle battery;

[0048] The thermal management time calculation module is used to determine the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time;

[0049] The temperature control module is used to adjust the temperature of the aircraft battery to a preset target temperature according to the thermal management time.

[0050] The present application discloses a battery thermal management device, which is applied to a flying car equipped with an aircraft battery and a car battery. The first full charge time of the car battery is obtained, and the thermal management time for the flying car to adjust the temperature is determined according to the first full charge time and the take-off time of the flying car. The temperature of the aircraft battery is adjusted according to the thermal management time, so that the temperature of the aircraft battery is adjusted before the take-off time, so as to avoid the aircraft battery consuming power to adjust its own temperature during the flight of the flying car, thereby reducing the power consumption of the aircraft battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments, wherein:

[0052] Figure 1 : A schematic diagram of a battery thermal management method according to an embodiment of the present application;

[0053] Figure 2 : Another schematic diagram of the process of the battery thermal management method provided in the embodiment of the present application;

[0054] Figure 3 : Another schematic diagram of a battery thermal management method according to an embodiment of the present application;

[0055] Figure 4 : A schematic diagram of the structure of a battery thermal management device provided in an embodiment of the present application;

[0056] Figure 5 : Another flow chart of the battery thermal management method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the implementation methods described below with reference to the drawings are exemplary and are only used to explain the implementation methods of the present application, and cannot be understood as limiting the implementation methods of the present application.

[0058] During the use of the ground-air split flying car, the discharge power of the aircraft battery is large and the duration is long, which causes the temperature of the aircraft battery to rise rapidly during the high-power discharge process and cannot keep its own temperature within a reasonable operating temperature range. In addition, the aircraft battery also needs to consume its own power to regulate its own temperature, which increases the power consumption of the aircraft battery.

[0059] Based on the above problems you may encounter, please refer to Figure 1 The present application embodiment provides a battery thermal management method, which is applied to a flying car including an aircraft battery and a car battery, and the method includes:

[0060] Step 101: Obtain a first full-charge time of the vehicle battery.

[0061] Step 102: Determine the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time.

[0062] In one embodiment, step 102 includes: obtaining a first state of charge of the vehicle battery, and comparing the first state of charge with a preset state of charge threshold.

[0063] When the first state of charge is greater than the state of charge threshold, the thermal management time of the aircraft battery is calculated according to the first full-charge time and a preset first thermal management duration.

[0064] When the first state of charge is less than or equal to the state of charge threshold, a first time difference between the first full-charge time and the flight time is calculated.

[0065] The first time difference is compared with a preset first duration threshold.

[0066] When the first time difference is less than or equal to the first duration threshold, the thermal management time of the aircraft battery is calculated according to the take-off time and a preset second thermal management duration.

[0067] When the first time difference is greater than the first time threshold, the charging operation of the vehicle battery is completed according to the first full-charging time.

[0068] In one embodiment, step 102 arranges the thermal management time of the aircraft battery based on the charging process of the car battery and the take-off time of the flying car, so as to adjust the temperature of the aircraft battery during the charging process of the flying car and reduce the power consumption of the aircraft battery for changing its own temperature.

[0069] Step 103: Adjust the temperature of the aircraft battery to a preset target temperature according to the thermal management time.

[0070] In one embodiment, after determining the flight time of the flying car, the aircraft battery of the flying car is charged first, and before obtaining the first full charge time of the vehicle battery, refer to Figure 2 , before step 101, the step further includes:

[0071] Step 201: Obtain a second full-charge time of the aircraft battery, and calculate a second time difference between the second full-charge time and the take-off time.

[0072] In an implementation manner of the present application, the step 201 mainly includes: before calculating the second time difference between the second full-charging time and the take-off time, comparing the second full-charging time with the take-off time, and determining that the second full-charging time is less than the take-off time.

[0073] When the second full-charge time is greater than or equal to the take-off time, the temperature of the aircraft battery is compared with a preset first temperature threshold and a second temperature threshold.

[0074] When the temperature of the aircraft battery is greater than or equal to the first temperature threshold or the temperature of the aircraft battery is less than or equal to the first temperature threshold, the temperature of the aircraft battery is adjusted to a first temperature.

[0075] The second full charge time of the aircraft battery is updated to a third full charge time according to the first temperature, the third full charge time is compared with the take-off time, and it is determined that the third full charge time is less than the take-off time.

[0076] In one embodiment, before obtaining the full charge time of the car battery, step 201 first obtains the full charge time of the aircraft battery, calculates the time difference between the full charge time and the take-off time, and sets the second time threshold to ensure that there is time to perform thermal management on the aircraft battery, thereby reducing pre-flight preparation time.

[0077] Step 202: Compare the second time difference with a preset second duration threshold.

[0078] Step 203: Determine whether the second time difference is greater than the second duration threshold.

[0079] In one embodiment, step 203 further includes: when the second time difference is less than or equal to the second duration threshold, calculating the thermal management time of the aircraft battery according to the take-off time and a preset third thermal management duration.

[0080] In step 203, after determining that there is only a short period of time between the aircraft battery being fully charged and the take-off time, the aircraft battery is temperature-regulated before the take-off time based on the third thermal management time to ensure that the aircraft battery is heated or cooled in advance before the flight plan.

[0081] It is understandable that the thermal management time in the embodiment of the present application can be the thermal management time determined according to the charging process of the car battery, or the thermal management time determined according to the charging process of the aircraft battery. Figure 3 , the step 103 comprises:

[0082] Step 301: Start the thermal management loop of the aircraft battery according to the thermal management time.

[0083] Step 302: Determine a regulation current corresponding to the thermal management loop according to the target temperature and the third state of charge of the aircraft battery at the thermal management moment.

[0084] Step 303: During the take-off time, sending the regulating current to the thermal management circuit to adjust the temperature of the aircraft battery to the target temperature through the thermal management circuit; wherein the target temperature is the temperature of the aircraft battery under discharge power.

[0085] A battery thermal management device is also provided in the embodiment of the present application. The battery thermal management method in the embodiment of the present application can be performed by the battery thermal management device in the embodiment of the present application. Specifically, the battery thermal management device can refer to Figure 4 , mainly including a charging time module 401, a thermal management time calculation module 402 and a temperature control module 403.

[0086] The charging time module 401 is used to obtain a first full charging time of the vehicle battery.

[0087] The thermal management time calculation module 402 is used to determine the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full charging time.

[0088] The temperature control module 403 is used to adjust the temperature of the aircraft battery to a preset target temperature according to the thermal management time.

[0089] The battery thermal management method and device provided in the embodiments of the present application are applied to a flying car equipped with an aircraft battery and a car battery. The first full charge time of the car battery is obtained, and the thermal management time for the flying car to adjust the temperature is determined according to the first full charge time and the take-off time of the flying car. The temperature of the aircraft battery is adjusted according to the thermal management time, so that the temperature of the aircraft battery is adjusted before the take-off time, so as to avoid the aircraft battery consuming power to adjust its own temperature during the flight of the flying car, thereby reducing the power consumption of the aircraft battery.

[0090] See also Figure 5 , is another flow chart of the battery thermal management method provided in the embodiment of the present application, which mainly includes steps 501 to 507, wherein the steps are mainly:

[0091] Step 501: When the flying car is connected to a charging power source, the take-off time of the flying car and the first full charging time of the aircraft battery in the flying car are obtained.

[0092] In the embodiment of the present application, when the integrated land-air flying car is charged and replenished, a pop-up window is displayed through the vehicle screen or the mobile phone APP to remind the flying car when there will be a flight plan. If the flight plan clearly sets the time for the flight. At this time, the battery management system estimates the current temperature and SOC of the aircraft battery and the charging capacity of the charging pile connected to the flying car to determine the first full charging time of the aircraft battery.

[0093] Step 502: Compare the first full-charge time with the take-off time to obtain the comparison result.

[0094] In the embodiment of the present application, the first full-charge time is compared with the take-off time to determine whether the first full-charge time is less than or equal to the take-off time.

[0095] Step 503: When the first full-charge time is greater than or equal to the take-off time, the temperature of the aircraft battery is compared with a preset temperature threshold to determine whether to replace the charging power source according to the comparison result, until the first full-charge time is less than the take-off time.

[0096] In an embodiment of the present application, if the first full charging time is greater than or equal to the take-off time, that is, it is determined that the flying car is not fully charged by the time of the planned flight or there is no time to pre-cool or preheat the aircraft battery, then it is determined whether the charging time is insufficient due to the capacity of the charging pile or the current temperature is too high or too low.

[0097] The aircraft battery is compared with a preset temperature threshold, and the temperature threshold is set to include a high temperature threshold and a low temperature threshold. If the battery temperature is ≥ the high temperature threshold (the initial value can be set to 45°C) or the battery temperature is ≤ the low temperature threshold (the initial value can be set to 0°C), the charging time is re-estimated according to the battery cooling to the second temperature (the initial value can be set to 25°C) or heating to the third temperature (the initial value can be set to 10°C). If the re-estimated first full charge time still does not meet the flight plan time, the user is prompted through the vehicle computer or APP that the current charging pile power is too low to meet the flight plan, and it is recommended to replace the charging pile.

[0098] Step 504: When the first full-charging time is less than the take-off time, a first time difference between the first full-charging time and the take-off time is calculated, and a comparison result between the first time difference and a preset first duration threshold is obtained.

[0099] In the embodiment of the present application, when the first full charging time is less than the take-off time, it means that the aircraft battery can be fully charged before the planned flight, and the car battery can continue to be charged after the aircraft battery is fully charged.

[0100] Optionally, a first time difference between the aircraft's full charge time and the flight plan time is calculated, and the first time difference is compared with a preset first duration threshold to determine whether the first time difference is less than or equal to the first duration threshold.

[0101] Step 505: When the first time difference is less than or equal to the first duration threshold, the charging is switched to the vehicle battery after the flight battery is fully charged, and the temperature of the aircraft battery is adjusted to the target temperature at the first thermal management duration before the flight plan.

[0102] In the embodiment of the present application, if the first time threshold is 1 hour and the first thermal management time is 30 minutes, then if the difference T2 between the full charge time of the aircraft battery and the first time of the flight plan is ≤1 hour, the vehicle battery will be switched to charge after the aircraft battery is fully charged, and the aircraft battery thermal management loop will be cooled or heated to the target temperature 30 minutes before the flight plan.

[0103] The target temperature is determined according to the discharge power of the aircraft battery. Here, the initial value of the target temperature can be set to 15°C.

[0104] Step 506: When the first time difference is greater than the first time length threshold, the state of charge of the vehicle battery is compared with a preset state of charge threshold, and a comparison result is obtained.

[0105] In an embodiment of the present application, if the time difference T2>1h, the state of charge of the vehicle battery is obtained, and the state of charge is compared with a preset state of charge threshold to determine whether the state of charge is less than or equal to the state of charge threshold.

[0106] Step 507: When the state of charge is greater than the state of charge threshold, the aircraft battery is switched to the vehicle battery for charging after the flight battery is fully charged, and the temperature of the aircraft battery is adjusted to the target temperature at the second thermal management time before the vehicle battery is fully charged.

[0107] In the embodiment of the present application, the state of charge threshold is set to 90%. If the time difference T2>1h, and the car battery SOC>90%, the vehicle battery is switched to the car battery for charging after the flight battery is fully charged, and the aircraft battery thermal management circuit is turned on for heating or cooling 5 minutes before the car battery is fully charged. The charging demand current of the battery thermal management circuit is determined according to the battery temperature and SOC, and the battery cell allowed charging parameter table is checked, and the current consumed by heating or cooling is sent to ensure that the battery is neither discharged nor charged until the battery temperature reaches the target temperature. The charging demand current is sent according to the actual battery demand current until the battery is fully charged.

[0108] Step 508: When the state of charge is less than or equal to the state of charge threshold, a second time difference between a second full charge time of the vehicle battery and the take-off time is calculated, and a comparison result between the second time difference and a preset second duration threshold is obtained.

[0109] In an embodiment of the present application, if the time difference T2>1h and the car battery SOC≤90%, the charging is switched to the car battery after the flight battery is fully charged, and the second time difference between the full charging time of the car battery and the take-off time is calculated to determine whether the second time difference is less than or equal to a preset second time threshold.

[0110] Step 509: When the second time difference is less than or equal to a preset second duration threshold, the temperature of the aircraft battery is adjusted to a target temperature at a first thermal management duration before the flight plan.

[0111] In an embodiment of the present application, if the battery at the vehicle end is fully charged 30 minutes before and the flight plan is ≤1 hour, the aircraft battery thermal management circuit is turned on for heating or cooling 30 minutes before the flight plan until the battery temperature reaches the target temperature.

[0112] Step 510: When the second time difference is greater than a preset second time threshold, charging is terminated after the vehicle battery is fully charged.

[0113] In the embodiment of the present application, if the battery at the vehicle end is fully charged 30 minutes before and the flight plan is greater than 1 hour, charging is terminated after the battery at the vehicle end is fully charged.

[0114] A battery thermal management method provided in an embodiment of the present application combines flight planning with charging. The remaining charging time can be calculated with the flight plan to adjust the battery charging strategies of the aircraft and the vehicle, thereby ensuring that the aircraft battery is heated or cooled to the optimal flight power in advance using the electricity from the charging pile before the flight plan, thereby reducing the increase in energy consumption caused by heating or cooling the battery output power, and saving the time for heating or cooling the flight battery to the optimal flight power before the flight.

[0115] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery thermal management method, characterized in that: Applied to a flying car including an aircraft battery and a car battery, the battery thermal management method comprises: Obtaining a first full-charge time of the vehicle battery; Determining a thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time; The temperature of the aircraft battery is adjusted to a preset target temperature according to the thermal management time.

2. A battery thermal management method according to claim 1, characterized in that: The step of determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time includes: Acquire a first state of charge of the vehicle battery, and compare the first state of charge with a preset state of charge threshold; When the first state of charge is greater than the state of charge threshold, the thermal management time of the aircraft battery is calculated according to the first full-charge time and a preset first thermal management duration.

3. A battery thermal management method according to claim 2, characterized in that: The step of determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time further includes: When the first state of charge is less than or equal to the state of charge threshold, calculating a first time difference between the first full charge time and the flight time; Comparing the first time difference with a preset first duration threshold; When the first time difference is less than or equal to the first duration threshold, the thermal management time of the aircraft battery is calculated according to the take-off time and a preset second thermal management duration.

4. A battery thermal management method according to claim 3, characterized in that: The step of determining the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time further includes: When the first time difference is greater than the first time threshold, the charging operation of the vehicle battery is completed according to the first full-charging time.

5. A battery thermal management method according to any one of claims 1 to 4, characterized in that: Before obtaining the first full charge time of the vehicle battery, the method includes: Obtaining a second full-charge time of the aircraft battery, and calculating a second time difference between the second full-charge time and the take-off time; Comparing the second time difference with a preset second duration threshold; It is determined that the second time difference is greater than the second duration threshold.

6. A battery thermal management method according to claim 5, characterized in that: Before obtaining the first full charge time of the vehicle battery, the method includes: When the second time difference is less than or equal to the second duration threshold, the thermal management time of the aircraft battery is calculated according to the take-off time and a preset third thermal management duration.

7. A battery thermal management method according to claim 5, characterized in that: Before calculating the second time difference between the second full-charge time and the take-off time, the method includes: comparing the second full-charge time with the take-off time; It is determined that the second full-charging time is less than the take-off time.

8. A battery thermal management method according to claim 7, characterized in that: Before calculating the second time difference between the second full-charge time and the take-off time, the method includes: When the second full-charge time is greater than or equal to the take-off time, comparing the temperature of the aircraft battery with a preset first temperature threshold and a second temperature threshold; When the temperature of the aircraft battery is greater than or equal to the first temperature threshold or the temperature of the aircraft battery is less than or equal to the first temperature threshold, adjusting the temperature of the aircraft battery to a first temperature; updating the second full charge time of the aircraft battery to a third full charge time according to the first temperature, and comparing the third full charge time with the take-off time; It is determined that the third full-charging time is less than the take-off time.

9. A battery thermal management method according to any one of claims 1 to 8, characterized in that: The step of adjusting the temperature of the aircraft battery to a preset target temperature according to the thermal management time comprises: activating a thermal management loop of the aircraft battery according to the thermal management moment; determining a regulating current corresponding to the thermal management loop according to the target temperature and a third state of charge of the aircraft battery at the thermal management moment; During the takeoff time, the regulating current is sent to the thermal management loop to adjust the temperature of the aircraft battery to the target temperature through the thermal management loop; wherein the target temperature is the temperature of the aircraft battery under discharge power.

10. A battery thermal management device, characterized in that: Applied to a flying car including an aircraft battery and a car battery, the battery thermal management device includes a charging time module, a thermal management time calculation module and a temperature control module; The charging time module is used to obtain the first full charging time of the vehicle battery; The thermal management time calculation module is used to determine the thermal management time of the aircraft battery based on the take-off time of the flying car and the first full-charge time; The temperature control module is used to adjust the temperature of the aircraft battery to a preset target temperature according to the thermal management time.

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