A navigation segment-based power battery thermal management method and system

Abstract

The application provides a power battery thermal management method and system based on navigation segmentation, and relates to the technical field of new energy vehicle battery management.In the vehicle navigation mileage corresponding to the vehicle navigation route, a first power battery thermal management mode is adopted for the power battery in the front section of the vehicle navigation route, and in the rear section of the vehicle navigation route, the power battery is subjected to the first power battery thermal management mode or the second power battery thermal management mode in combination with the charging state of the vehicle-mounted charger, that is, in combination with the navigation mileage corresponding to the vehicle navigation route, the thermal management demand is distinguished according to the segmentation of the vehicle navigation route, different power battery thermal management modes are used, the power battery thermal management energy consumption in different navigation route sections is coordinated and planned, the energy waste phenomenon caused by the adoption of the whole consistent vehicle power battery thermal management is avoided, and the total endurance of the vehicle is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy automobile battery management, and more particularly to a power battery thermal management method and system based on navigation segmentation. BACKGROUND

[0002] With the rapid development of the automobile industry and the continuous progress of electronic technology, new energy vehicles have become the goal pursued by people. New energy vehicles use new energy to provide power, which helps to alleviate the impact of automobile exhaust on the environment. Therefore, researching and optimizing new energy vehicle technology is of great significance to environmental protection and reducing the burden of traditional energy on the country.

[0003] As the power source of new energy vehicles, the temperature of power batteries is a key factor affecting their safety and performance. Excessive or insufficient temperature has a negative impact on the life of the battery. During the charging and discharging process of the battery, low temperature may cause a sharp decline in battery capacity and power, and even cause short circuits. High temperature may cause battery decomposition, corrosion, fire, and even explosion. Cooling and heating of power batteries is an extremely important part of power battery thermal management.

[0004] Currently, the development and popularization of new energy vehicles face many challenges. The actual power consumption of new energy vehicles during driving is relatively high, and the corresponding traditional battery thermal management method also has the disadvantage of energy waste. The prior art discloses a thermal management method and system (publication number: CN116021944A, publication date: April 28, 2023). First, a predicted value of the working temperature of the thermal management target device is obtained. The temperature prediction value is predicted according to the road condition parameters of the vehicle driving route. Then, according to the temperature prediction value, the thermal management mode of the target device is switched, i.e. the target device is heated or cooled. This technical solution can effectively reduce the energy consumption of the thermal management system, realize the smoothing of the temperature adjustment power, and improve the thermal management efficiency. This thermal management method uses the predicted working temperature as the most direct thermal management control standard. However, in the actual driving needs of new energy vehicles, users are more concerned about the impact of power battery energy consumption on vehicle range. Therefore, it is crucial to adopt a thermal management method that affects the energy consumption of power batteries. The current thermal management method does not take into account the vehicle range, so how to balance the vehicle range and coordinate the energy consumption of power battery thermal management in the vehicle range is a technical problem that needs to be solved. SUMMARY

[0005] One of the purposes of the present application is to provide a power battery thermal management method based on navigation segmentation, which solves the problem of how to balance the vehicle range and coordinate the planning of the power battery thermal management energy consumption, avoids the energy waste phenomenon of vehicle power battery thermal management, and improves the total endurance of the vehicle.

[0006] In order to achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0007] A power battery thermal management method based on navigation segmentation, comprising the following steps:

[0008] Obtaining a vehicle navigation route;

[0009] Dividing the vehicle navigation route into a navigation front section route and a navigation rear section route;

[0010] In the navigation front section route, a first power battery thermal management mode is adopted for the power battery of the vehicle;

[0011] In the navigation rear section route, if the on-board charger is in a charging state, the first power battery thermal management mode is adopted for the power battery of the vehicle, and if the on-board charger is in a non-charging state, a second power battery thermal management mode is adopted for the power battery of the vehicle.

[0012] According to the above technical means, after dividing the vehicle navigation route into a navigation front section route and a navigation rear section route, in the vehicle navigation range corresponding to the vehicle navigation route, the first power battery thermal management mode is adopted for the power battery of the vehicle in the navigation front section route, and in the navigation rear section route, the first power battery thermal management mode or the second power battery thermal management mode is adopted for the power battery of the vehicle in combination with the charging state of the on-board charger, that is, in combination with the navigation range corresponding to the vehicle navigation route, the thermal management demand is distinguished according to the navigation route segmentation, the power battery thermal management energy consumption in different navigation route sections is coordinated and planned by using different power battery thermal management modes, the energy waste phenomenon of adopting the whole consistent vehicle power battery thermal management is avoided, and the total endurance of the vehicle is further improved.

[0013] Further, the first power battery thermal management mode is used for cooling or heating the power battery in the navigation front section route, and is used for cooling or heating the power battery in the charging state of the on-board charger, and the second power battery thermal management mode is used for cooling or heating the power battery in the navigation rear section route and in the non-charging state of the on-board charger.

[0014] Further, before the step of obtaining the vehicle navigation route, the method further comprises:

[0015] If yes, a vehicle navigation route is acquired; otherwise, waiting until a power battery cooling or heating request signal is acquired.

[0016] According to the above technical means, the execution of the navigation segment-based power battery thermal management method is based on the premise that the power battery sends a cooling or heating request signal. If the power battery does not request cooling or heating, the power battery thermal management is not performed.

[0017] Further, the process of acquiring the vehicle navigation route comprises:

[0018] Acquiring current position information of the vehicle;

[0019] If yes, acquiring position information of a preset destination, and obtaining a vehicle navigation route according to the current position information of the vehicle and the position information of the preset destination; otherwise, when the power battery cooling or heating request signal is acquired, a first thermal management mode is used to cool or heat the power battery of the vehicle.

[0020] Further, based on the whole vehicle CAN communication, the current position information of the vehicle, a navigation state signal, a remaining mileage signal of the vehicle from a preset destination, a power battery cell temperature signal, a power battery heating and cooling request signal, and a charging state signal of a vehicle-mounted charger are acquired; when the remaining mileage signal of the vehicle from the preset destination is acquired, the remaining mileage signal of the vehicle from the preset destination is filtered.

[0021] Through the above technical means, considering that the remaining mileage signal fluctuates in a large range, the filtering processing is performed to remove the interference of the false remaining mileage signal.

[0022] Further, the process of dividing the vehicle navigation route into a pre-navigation segment route and a post-navigation segment route comprises:

[0023] Acquiring road condition parameters P1, navigation mileage P2, and environmental temperature P3 in a vehicle driving process under the vehicle navigation route;

[0024] Different influence factors a1, a2, and a3 are respectively assigned to the road condition parameters of the vehicle driving, the navigation mileage, and the environmental temperature in the vehicle driving process;

[0025] Setting the length of the pre-navigation segment route as X and the length of the post-navigation segment route as Y, taking the minimum power battery energy consumption as an optimization target, and considering the road condition parameters of the vehicle driving, the navigation mileage, and the environmental temperature in the vehicle driving process under different influence factors, a target function is constructed:

[0026] min E=y α1,α2,α3 (X, P1, P2, P3) + y α1,α2,α3(Y, P1, P2, P3)

[0027] wherein, E represents the power battery energy consumption; y α1,α2,α3 (X, P1, P2, P3) represents the power battery energy consumption under the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the navigation front section route; y α1,α2,α3 (Y, P1, P2, P3) represents the power battery energy consumption under the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the navigation rear section route;

[0028] The optimization algorithm is used to solve the objective function, and the navigation front section route length X and the navigation rear section route length Y are obtained, so that the division point of the vehicle navigation route divided into the navigation front section route and the navigation rear section route is obtained.

[0029] According to the above technical means, the corresponding vehicle driving road condition parameters, navigation mileage and environmental temperature and other information parameters under the total navigation route are considered, different influence factors are set for different information parameters, the power battery energy consumption under the influence of several parameters is comprehensively considered, the division point of the navigation front section route and the navigation rear section route under the current driving is calculated, then the heat management demand is distinguished according to the road segmentation, the heat management energy consumption is optimized, the energy is saved as much as possible, and the vehicle mileage target is ensured.

[0030] Further, the first power battery heat management mode is a standard battery heating and cooling mode, and the second power battery heat management mode is a special battery heating and cooling mode; when the battery is cooled, the cooling threshold of the special battery heating and cooling mode is greater than that of the standard battery heating and cooling mode, and the temperature of the power battery in the navigation rear section route is allowed to rise to a limit value, and after the vehicle reaches the preset destination, the power battery is naturally cooled by the environment; when the battery is heated, the temperature threshold of the special battery heating and cooling mode is less than that of the standard battery heating and cooling mode, and the temperature of the power battery in the navigation rear section route is allowed to drop to a limit value until the vehicle reaches the preset destination, so as to avoid that after the vehicle reaches the destination, the power battery dissipates too much energy.

[0031] Further, the cooling or heating control mode under the standard battery heating and cooling mode and the special battery heating and cooling mode includes: cooling fan speed control, battery target inlet water temperature control, battery water pump speed control, heat management valve body control, electric compressor speed control and electric heater control.

[0032] A power battery heat management system based on navigation segmentation, comprising:

[0033] A car navigation unit is configured to obtain a vehicle navigation route.

[0034] A thermal management controller unit is configured to divide a vehicle navigation route into a navigation front section and a navigation rear section.

[0035] A thermal management unit is configured to adopt a first power battery thermal management mode for the power battery of the vehicle in the navigation front section, and adopt the first power battery thermal management mode for the power battery of the vehicle if the on-board charger is in a charging state, or adopt a second power battery thermal management mode for the power battery of the vehicle if the on-board charger is in a non-charging state in the navigation rear section.

[0036] Further, the power battery thermal management system based on navigation segmentation further comprises:

[0037] A battery management unit is configured to acquire a power battery cooling or heating request signal before acquiring the vehicle navigation route.

[0038] The present application has the following beneficial effects:

[0039] The present application provides a power battery thermal management method and system based on navigation segmentation. In the vehicle navigation mileage corresponding to the vehicle navigation route, the first power battery thermal management mode is adopted for the power battery of the vehicle in the navigation front section of the vehicle, and the first power battery thermal management mode or the second power battery thermal management mode is adopted for the power battery of the vehicle in the navigation rear section of the vehicle in combination with the charging state of the on-board charger. That is, in combination with the navigation mileage corresponding to the vehicle navigation route, the thermal management demand is distinguished according to the navigation route segmentation, different power battery thermal management modes are used, the power battery thermal management energy consumption in different navigation route sections is coordinated and planned, the energy waste phenomenon caused by the overall consistent vehicle power battery thermal management is avoided, and the total cruising range of the vehicle is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Fig. 1 is a schematic diagram of the overall flow of the power battery thermal management method based on navigation segmentation according to an embodiment of the present application;

[0041] Figure 2 Fig. 2 is a schematic diagram of the flow of acquiring the vehicle navigation route according to an embodiment of the present application;

[0042] Figure 3 Fig. 3 is a schematic diagram of a specific implementation flow of the power battery thermal management method based on navigation segmentation according to an embodiment of the present application;

[0043] Figure 4 Fig. 4 is a schematic diagram of the power battery thermal management system based on navigation segmentation according to an embodiment of the present application.

[0044] In the present application, 101 is a navigation unit of a vehicle machine, 102 is a thermal management controller unit, 103 is a thermal management unit, and 104 is a battery management unit. DETAILED DESCRIPTION

[0045] Other advantages and embodiments of the application will be more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0046] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, that since the application is of a generic nature, it can be implemented in many different forms, and that it should not be confined to the details given in the following description.

[0047] The following describes the English terms used in the embodiments:

[0048] CAN is short for Controller Area Network, a serial communication protocol.

[0049] In the embodiments, a navigation-segment-based power battery thermal management method is provided, as shown in Figure 1 The method comprises the following steps:

[0050] S1. Obtain a vehicle navigation route.

[0051] S2. Divide the vehicle navigation route into a navigation front-segment route and a navigation rear-segment route.

[0052] S3. In the navigation front-segment route, adopt a first power battery thermal management mode for the power battery of the vehicle.

[0053] S4. In the navigation rear-segment route, if the on-board charger is in a charging state, adopt the first power battery thermal management mode for the power battery of the vehicle, and if the on-board charger is in a non-charging state, adopt a second power battery thermal management mode for the power battery of the vehicle.

[0054] In the embodiments, the first power battery thermal management mode is used to cool or heat the power battery in the navigation front-segment route and the power battery in the charging state of the on-board charger, and the second power battery thermal management mode is used to cool or heat the power battery in the navigation rear-segment route and the power battery in the non-charging state of the on-board charger. That is, different power battery thermal management modes are adopted for different navigation route segments and different states of the on-board charger.

[0055] The above implementation process combines the navigation mileage corresponding to the vehicle navigation route, distinguishes the thermal management demand according to the vehicle navigation route segmentation, and uses different power battery thermal management modes to coordinate and plan the power battery thermal management energy consumption in different navigation route segments, thereby avoiding the energy waste phenomenon of using overall consistent vehicle power battery thermal management, and further improving the total endurance of the vehicle.

[0056] Before the step S1 of obtaining the vehicle navigation route, the following steps are further included:

[0057] It is judged whether the power battery cooling or heating request signal is obtained. If yes, the step S1 is entered to obtain the vehicle navigation route. Otherwise, the waiting is performed until the power battery cooling or heating request signal is obtained. This step also shows that the execution of the power battery thermal management method based on navigation segmentation proposed in this embodiment is based on the premise that the power battery sends a cooling or heating request signal. If the power battery does not request cooling or heating, the power battery thermal management is not performed.

[0058] Referring to Figure 2 In the step S1, the process of obtaining the vehicle navigation route includes:

[0059] S11. Obtain the current position information of the vehicle;

[0060] S12. It is judged whether the vehicle enters navigation. If yes, the position information of the preset destination is obtained, and the vehicle navigation route is obtained according to the current position information of the vehicle and the position information of the preset destination. Otherwise, when the power battery cooling or heating request signal is obtained, the first thermal management mode is used to cool or heat the vehicle power battery.

[0061] In this embodiment, based on the whole vehicle CAN communication, the current position information of the vehicle, the navigation state signal (whether the vehicle enters navigation), the remaining mileage signal of the vehicle from the preset destination, the power battery cell temperature signal, the power battery heating and cooling request signal and the charging state signal of the vehicle-mounted charger are obtained. When the remaining mileage signal of the vehicle from the preset destination is obtained, the remaining mileage signal of the vehicle from the preset destination is filtered to remove the interference of the false remaining mileage signal, and the refresh step and refresh time of the rising or falling of the remaining mileage are controlled.

[0062] In the embodiment, the first power battery thermal management mode is a standard battery heating and cooling mode, i.e. the battery heating and cooling mode equipped in the vehicle in the conventional case, which is not subjected to other transformation setting processing and will not be adjusted in different navigation routes. The second power battery thermal management mode is a special battery heating and cooling mode proposed in the embodiment. In the standard battery heating and cooling mode, for the special battery heating and cooling mode, when the battery is cooled, the cooling threshold of the special battery heating and cooling mode is greater than the cooling threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter navigation route is allowed to rise to the limit value. After the vehicle reaches the preset destination, the power battery is naturally cooled by the environment. When the battery is heated, the temperature threshold of the special battery heating and cooling mode is less than the temperature threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter navigation route is allowed to drop to the limit value until the vehicle reaches the preset destination, so as to avoid that the power battery dissipates too much energy after the vehicle reaches the destination.

[0063] The cooling or heating control modes in the standard battery heating and cooling mode and the special battery heating and cooling mode include cooling fan rotating speed control, battery target inlet water temperature control, battery water pump rotating speed control, thermal management valve control, electric compressor rotating speed control and electric heater control. How to operate each cooling or heating control mode is not described in detail here, which is obtained through simulation analysis and real vehicle calibration of the vehicle thermal management unit in actual implementation.

[0064] At this time, the two thermal management modes are combined with the navigation mileage corresponding to the vehicle navigation route, and the thermal management demand is distinguished according to the vehicle navigation route segmentation. For the former navigation route, the standard battery heating and cooling mode will not consider increasing the cooling threshold, and the thermal management is performed according to the normal standard setting. For the latter navigation route, when the battery is cooled, the cooling threshold of the special battery heating and cooling mode is greater than the cooling threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter navigation route is allowed to rise to the limit value. After the vehicle reaches the preset destination, the power battery is naturally cooled by the environment. When the battery is heated, the temperature threshold of the special battery heating and cooling mode is less than the temperature threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter navigation route is allowed to drop to the limit value until the vehicle reaches the preset destination, so as to avoid that the power battery dissipates too much energy after the vehicle reaches the destination. At this time, the different power battery thermal management modes are used to coordinate and plan the power battery thermal management energy consumption in different navigation route segments, avoid the energy waste phenomenon of the whole consistent vehicle power battery thermal management, and can improve the actual endurance of the vehicle.

[0065] In the above described process, the division of the front navigation section and the rear navigation section in the vehicle navigation route is crucial, and in the embodiment, the process of dividing the vehicle navigation route into the front navigation section and the rear navigation section is as follows:

[0066] Firstly, the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the vehicle driving process under the vehicle navigation route are obtained; wherein, the navigation mileage P2 can be directly obtained under the known vehicle navigation route, the road condition parameter P2 in the vehicle driving process can be displayed based on the vehicle navigation route through the vehicle background platform, and the environmental temperature P3 in the vehicle driving process can also be displayed based on the vehicle navigation route through the vehicle background platform, but the influence of different parameter information on the power battery energy consumption of the vehicle itself under the entire vehicle navigation route is different, so:

[0067] Different influence factors a1, a2 and a3 are respectively assigned to the road condition parameter in the vehicle driving process, the navigation mileage and the environmental temperature in the vehicle driving process; in the specific implementation, the influence of the road condition parameter in the vehicle driving process on the power battery energy consumption is generally that the smoother the road condition, the less the additional energy consumption, and the more the obstacles in the driving road condition, the greater the additional energy consumption, and the influence of the environmental temperature in the vehicle driving process is generally that the higher the environmental temperature, the stronger the heat dissipation performance of the vehicle, and the greater the power battery energy consumption, but among the three parameters of the road condition parameter in the vehicle driving process, the navigation mileage and the environmental temperature in the vehicle driving process, the length of the navigation mileage has the greatest influence on the power battery energy consumption, and in the application, a1, a2 and a3 are respectively set to 0.25, 0.5 and 0.25, under the condition that the above influence factors and different influence factor adaptors are known, according to the vehicle navigation route, the length of the front navigation section is X, and the length of the rear navigation section is Y, the power battery energy consumption is minimized as the optimization target, the road condition parameter in the vehicle driving process, the navigation mileage and the environmental temperature in the vehicle driving process under different influence factors are considered, and the objective function is constructed:

[0068] min E=y α1,α2,α3 (X, P1, P2, P3) + y α1,α2,α3 (Y, P1, P2, P3)

[0069] Wherein, E represents the power battery energy consumption; y α1,α2,α3 (X, P1, P2, P3) represents the power battery energy consumption under the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the vehicle driving process in the front navigation section; y α1,α2,α3 (Y, P1, P2, P3) represents the power battery energy consumption under the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the vehicle driving process in the rear navigation section.

[0070] The optimization algorithm is used to solve the objective function, such as genetic algorithm, to obtain the length X of the navigation front section and the length Y of the navigation rear section, so as to obtain the division point of the vehicle navigation route divided into the navigation front section and the navigation rear section.

[0071] The above vehicle power battery thermal management process is integrated, and the specific implementation process can be referred to Figure 3 , first, step S101 is executed. It is determined that the ON mode of the vehicle power supply is valid.

[0072] S102. Obtain information through vehicle CAN communication, including: obtaining the current position information of the vehicle, the navigation state signal and the remaining distance signal of the vehicle from the preset destination through vehicle CAN communication, obtaining the cell temperature signal of the power battery and the heating or cooling request signal of the power battery through vehicle CAN communication, that is, whether the power battery sends a heating or cooling request signal; obtaining the charging state signal of the vehicle-mounted charger through vehicle CAN communication, that is, whether the vehicle-mounted charger is in a charging state.

[0073] S103. Determine whether the power battery cooling or heating request signal is obtained, if yes, execute step S104; otherwise, execute step S105;

[0074] S104. Determine whether the vehicle is in navigation, if yes, execute step S106; otherwise, execute step S107;

[0075] S105. Wait until the power battery cooling or heating request signal is obtained, return to step S104. If the power battery does not request cooling or heating, the power battery thermal management is not performed.

[0076] S106. Determine whether the remaining distance of the vehicle navigation route is less than Y, if yes, execute step S108; otherwise, execute step S107;

[0077] Here, the remaining distance is compared with Y to determine whether the remaining distance is in the navigation front section or the navigation rear section, so as to determine whether the first thermal management mode or the second thermal management mode is used.

[0078] S107. The first thermal management mode is used to cool or heat the vehicle power battery, and after the cooling or heating is completed, it is returned to step S103 to determine whether the power battery cooling or heating request signal is obtained.

[0079] S108. Determine whether the vehicle-mounted charger is in a charging state, if yes, return to step S107; otherwise, execute step S109;

[0080] S109. Use the second thermal management mode to cool or heat the vehicle's power battery. After cooling or heating is completed, return to step S103 to determine whether a power battery cooling or heating request signal has been obtained.

[0081] like Figure 4 As shown, in this embodiment, a power battery thermal management system based on navigation segmentation is also proposed, see [link to relevant documentation]. Figure 4 ,include:

[0082] The vehicle navigation unit 101 is used to obtain the vehicle navigation route;

[0083] The thermal management controller unit 102 is used to divide the vehicle navigation route into a navigation front section and a navigation back section. In this embodiment, the thermal management controller unit 102 adapts the influence factors of different information parameters based on the obtained road condition parameters, navigation mileage and ambient temperature of the vehicle, and then calculates the division point of the front and back sections in the current navigation route.

[0084] The thermal management unit 103 adopts a first power battery thermal management mode for the vehicle's power battery during the initial navigation route; during the later navigation route, if the on-board charger is charging, the first power battery thermal management mode is adopted for the vehicle's power battery, and if the on-board charger is not charging, a second power battery thermal management mode is adopted for the vehicle's power battery.

[0085] After segmenting the vehicle navigation route, the first segment uses the first power battery thermal management mode, i.e., the normal battery cooling and heating mode, while the second segment uses the second power battery thermal management mode, i.e., the special battery cooling and heating mode. Compared to the normal battery cooling and heating mode, the special battery cooling and heating mode sets the battery cooling threshold higher than the normal battery cooling mode, allowing the battery temperature to continue to rise to its limit during the latter part of the navigation, and then allowing the environment to cool the battery naturally upon arrival at the destination. The special mode sets the heating temperature threshold lower than the normal battery heating mode, allowing the battery temperature to continue to drop to its limit during the latter part of the navigation, preventing excessive energy loss from the battery after the vehicle arrives at its destination.

[0086] like Figure 4 As shown, the system also includes:

[0087] Before acquiring the vehicle navigation route, the battery management unit 104 acquires a power battery cooling or heating request signal and a battery cell temperature signal.

[0088] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for thermal management of a power battery based on navigation segments, characterized in that, The method comprises the following steps: obtaining a vehicle navigation route; dividing the vehicle navigation route into a navigation front section and a navigation rear section; the process of dividing the vehicle navigation route into the navigation front section and the navigation rear section comprises: obtaining road condition parameters P1, navigation mileage P2 and environmental temperature P3 in the process of vehicle driving under the vehicle navigation route; allocating different influence factors α1, α2 and α3 to the road condition parameters, the navigation mileage and the environmental temperature in the process of vehicle driving, respectively; setting the length of the navigation front section as X and the length of the navigation rear section as Y, taking the minimum energy consumption of the power battery as the optimization target, and considering the road condition parameters, the navigation mileage and the environmental temperature in the process of vehicle driving under different influence factors, a target function is constructed as follows: min E= y α1,α2,α3 (X, P1, P2, P3) + (Y, P1, P2, P3) y α1,α2,α3 (Y, P1, P2, P3) E represents the power battery energy consumption; y α1,α2,α3 (X, P1, P2, P3) represents the power battery energy consumption in the navigation front section route, considering the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the vehicle driving process; y α1,α2,α3 (Y, P1, P2, P3) represents the power battery energy consumption in the navigation rear section route, considering the influence of the road condition parameter P1, the navigation mileage P2 and the environmental temperature P3 in the vehicle driving process; solving the target function by using an optimization algorithm to obtain the length X of the navigation front section and the length Y of the navigation rear section, thereby obtaining the dividing point of the vehicle navigation route into the navigation front section and the navigation rear section; in the navigation front section, a first power battery thermal management mode is adopted for the power battery of the vehicle; in the navigation rear section, if the on-board charger is in a charging state, the first power battery thermal management mode is adopted for the power battery of the vehicle, and if the on-board charger is in a non-charging state, a second power battery thermal management mode is adopted for the power battery of the vehicle.

2. The navigation segment-based power battery thermal management method of claim 1, wherein, The first power battery thermal management mode is used for cooling or heating the power battery in the navigation front section and the power battery in the charging state of the on-board charger, and the second power battery thermal management mode is used for cooling or heating the power battery in the navigation rear section and the power battery in the non-charging state of the on-board charger.

3. The navigation segment-based power battery thermal management method of claim 1, wherein, Before the step of obtaining the vehicle navigation route, the method further comprises: determining whether a power battery cooling or heating request signal is obtained, if yes, obtaining the vehicle navigation route; otherwise, waiting until the power battery cooling or heating request signal is obtained.

4. The navigation segment-based power battery thermal management method of claim 3, wherein, The process of obtaining the vehicle navigation route comprises: obtaining current position information of the vehicle; determining whether the vehicle enters navigation, if yes, obtaining position information of a preset destination, and obtaining the vehicle navigation route according to the current position information of the vehicle and the position information of the preset destination; otherwise, when the power battery cooling or heating request signal is obtained, cooling or heating the power battery of the vehicle by using the first thermal management mode.

5. The navigation segment-based power battery thermal management method of claim 4, wherein, Based on the whole vehicle CAN communication, the current position information of the vehicle, a navigation state signal, a remaining mileage signal of the vehicle from the preset destination, a power battery cell temperature signal, a power battery heating and cooling request signal and a charging state signal of the on-board charger are obtained; when the remaining mileage signal of the vehicle from the preset destination is obtained, the remaining mileage signal of the vehicle from the preset destination is filtered.

6. The navigation segment-based power battery thermal management method according to any one of claims 1-5, characterized in that, The first power battery thermal management mode is a standard battery heating and cooling mode, and the second power battery thermal management mode is a special battery heating and cooling mode; when battery cooling is performed, the cooling threshold of the special battery heating and cooling mode is greater than the cooling threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter part of the navigation route is allowed to rise to a limit value, and after the vehicle reaches the preset destination, the power battery is naturally cooled by the environment; when battery heating is performed, the temperature threshold of the special battery heating and cooling mode is less than the temperature threshold of the standard battery heating and cooling mode, and the temperature of the power battery in the latter part of the navigation route is allowed to drop to a limit value until the vehicle reaches the preset destination.

7. The navigation segment-based power battery thermal management method of claim 6, wherein, The cooling or heating control mode in the standard battery heating and cooling mode and the special battery heating and cooling mode both include: cooling fan speed control, battery target inlet water temperature control, battery water pump speed control, thermal management valve body control, electric compressor speed control and electric heater control.

8. A navigation segment based power battery thermal management system, characterized in that, The system is used to realize the navigation segment-based power battery thermal management method of claim 1, and comprises: A car navigation unit is configured to obtain a vehicle navigation route. A thermal management controller unit is configured to divide the vehicle navigation route into a former part of the navigation route and a latter part of the navigation route. A thermal management unit is configured to adopt a first power battery thermal management mode for the power battery of the vehicle in the former part of the navigation route, and adopt the first power battery thermal management mode for the power battery of the vehicle if the on-board charger is in a charging state in the latter part of the navigation route, or adopt a second power battery thermal management mode for the power battery of the vehicle if the on-board charger is in a non-charging state.

9. The navigation segment-based power battery thermal management system of claim 8, wherein, Further comprising: A battery management unit is configured to obtain a power battery cooling or heating request signal before obtaining the vehicle navigation route.

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