Thermal management methods, devices, storage media, electronic equipment, and vehicles for power batteries

Abstract

This disclosure relates to a thermal management method, apparatus, storage medium, electronic device, and vehicle for a power battery. The method includes: acquiring a target external ambient temperature of the vehicle within a preset time period; acquiring charge and discharge data of the power battery within the preset time period; acquiring performance parameters of the power battery at the end of the preset time period; and controlling the power battery to execute a thermal management strategy based on the target external ambient temperature, the charge and discharge data, and the performance parameters.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a thermal management method, apparatus, storage medium, electronic device, and vehicle for a power battery. Background Technology

[0002] With the rapid development of new energy vehicles, power batteries, as a crucial component, significantly impact vehicle safety and driver comfort. Currently, thermal management strategies are typically employed to control the internal temperature of the battery in order to maintain its performance.

[0003] However, changes in the external environment of vehicle operation and the chemical properties of the battery itself may affect the effectiveness of the configured thermal management strategy, causing problems such as accelerated battery life degradation and decreased battery performance, increasing the driver's vehicle usage costs, and battery performance may also affect driving safety. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a thermal management method, apparatus, storage medium, electronic device, and vehicle for a power battery.

[0005] According to a first aspect of the present disclosure, a thermal management method for a power battery is provided, comprising:

[0006] The system acquires the target external ambient temperature of the vehicle within a preset time period; acquires the charge and discharge data of the power battery within the preset time period; acquires the performance parameters of the power battery at the endpoint of the preset time period, where the endpoint includes the start and end times of the preset time period; and controls the power battery to execute a thermal management strategy based on the target external ambient temperature, the charge and discharge data, and the performance parameters.

[0007] Optionally, controlling the power battery to perform a thermal management strategy based on the target external ambient temperature, the charge / discharge data, and the performance parameters includes: determining the battery state parameters of the power battery based on the target external ambient temperature, the charge / discharge data, and the performance parameters, wherein the battery state parameters characterize the degree of performance degradation of the power battery; and controlling the power battery to perform a thermal management strategy based on the battery state parameters.

[0008] Optionally, the performance parameters include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery; determining the battery status parameters of the power battery based on the target external ambient temperature, the charge / discharge data, and the performance parameters includes: determining a temperature influence parameter based on the target external ambient temperature, wherein the temperature influence parameter characterizes the degree of influence of the vehicle's external ambient temperature on the power battery; determining a charge / discharge influence parameter based on the charge / discharge data, wherein the charge / discharge influence parameter characterizes the degree of influence of the power battery's charge / discharge on the power battery; determining a component aging influence parameter based on the thermal conductivity, wherein the component aging influence parameter characterizes the degree of influence of the aging of the power battery's heat-conducting components on the power battery; determining a degradation influence parameter based on the health status, wherein the degradation influence parameter characterizes the degree of influence of the degradation of the power battery's health status on the power battery; and determining the battery status parameters based on the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter.

[0009] Optionally, determining the battery state parameter based on the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter includes: using the product of the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter as the battery state parameter.

[0010] Optionally, obtaining the target external ambient temperature of the vehicle within a preset time period includes: obtaining multiple external ambient temperatures within the preset time period; taking the average of the multiple external ambient temperatures as the target external ambient temperature; determining the temperature influence parameter based on the target external ambient temperature includes: obtaining the average ambient temperature of a preset area within the preset time period, the preset area including the operating area of ​​the vehicle; and determining the temperature influence parameter based on the difference between the target external ambient temperature and the average ambient temperature.

[0011] Optionally, the charge / discharge data includes the number of charge / discharge cycles completed by the power battery; determining the charge / discharge impact parameter based on the charge / discharge data includes: obtaining the number of cycles of the power battery in multiple sub-time periods within the preset time period; determining the available charge / discharge impact parameter for each sub-time period based on the number of cycles of the power battery in the multiple sub-time periods; and determining the average value of the multiple available charge / discharge impact parameters as the charge / discharge impact parameter.

[0012] Optionally, the thermal conductivity includes a first thermal conductivity and a second thermal conductivity; determining the component aging impact parameter based on the thermal conductivity includes: obtaining the first thermal conductivity of the power battery at the start of the preset time period; obtaining the second thermal conductivity of the power battery at the end of the preset time period; and determining the component aging impact parameter based on the first thermal conductivity and the second thermal conductivity.

[0013] Optionally, the thermal conductivity is obtained by: obtaining a first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, a second temperature at the outlet of the coolant flow channel, a third temperature of the coolant, and a fourth temperature of the battery pack of the power battery during a heating period of battery charging; and determining the thermal conductivity based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0014] Optionally, the health status includes a first health status and a second health status; determining the attenuation impact parameter based on the health status includes: obtaining the first health status of the power battery at the start of the preset time period; obtaining the second health status of the power battery at the end of the preset time period; and determining the attenuation impact parameter based on the first health status and the second health status.

[0015] Optionally, the health status is obtained by: obtaining the change value of the open-circuit voltage of the power battery during a deep charging period, wherein the deep charging period includes a first resting period from when the vehicle is disconnected from the power supply to when the battery begins to charge, a battery charging period, and a second resting period from when the battery completes charging to when the vehicle is connected to the power supply; obtaining the change value of the actual stored capacity of the power battery during the deep charging period; and determining the health status based on the change value of the open-circuit voltage and the change value of the actual stored capacity.

[0016] Optionally, controlling the power battery to perform a thermal management strategy based on the battery state parameters includes: when the battery state parameters are less than a preset value, controlling the power battery to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system; or, when the battery state parameters are greater than the preset value, controlling the power battery to lower the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0017] According to a second aspect of the present disclosure, a thermal management device for a power battery is provided, comprising:

[0018] The first acquisition module is used to acquire the target external ambient temperature of the vehicle within a preset time period;

[0019] The second acquisition module is used to acquire the charging and discharging data of the power battery within the preset time period;

[0020] The third acquisition module is used to acquire the performance parameters of the power battery at the end point of the preset time period, wherein the end point includes the start and end points of the preset time period.

[0021] The control module is used to control the power battery to execute a thermal management strategy based on the target external ambient temperature, the charging and discharging data, and the performance parameters.

[0022] Optionally, the control module is further configured to determine the battery state parameters of the power battery based on the target external ambient temperature, the charging and discharging data, and the performance parameters. The battery state parameters are used to characterize the degree of performance degradation of the power battery, and to control the power battery to perform a thermal management strategy based on the battery state parameters.

[0023] Optionally, the performance parameters include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery; the control module is further configured to determine temperature influence parameters based on the target external ambient temperature, wherein the temperature influence parameters characterize the degree of influence of the vehicle's external ambient temperature on the power battery; determine charge-discharge influence parameters based on the charge-discharge data, wherein the charge-discharge influence parameters characterize the degree of influence of the power battery's charge-discharge on the power battery; determine component aging influence parameters based on the thermal conductivity, wherein the component aging influence parameters characterize the degree of influence of the aging of the power battery's heat-conducting components on the power battery; determine degradation influence parameters based on the health status, wherein the degradation influence parameters characterize the degree of influence of the degradation of the power battery's health status on the power battery; and determine the battery state parameters based on the temperature influence parameters, the charge-discharge influence parameters, the component aging influence parameters, and the degradation influence parameters.

[0024] Optionally, the control module is further configured to use the product of the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter as the battery state parameter.

[0025] Optionally, the first acquisition module is further configured to acquire multiple external ambient temperatures within the preset time period, and take the average value of the multiple external ambient temperatures as the target external ambient temperature, and acquire the average ambient temperature of a preset area within the preset time period, the preset area including the vehicle's operating area; the control module is further configured to determine the temperature influence parameter based on the difference between the target external ambient temperature and the average ambient temperature.

[0026] Optionally, the charge / discharge data includes the number of charge / discharge cycles completed by the power battery; the second acquisition module is further configured to acquire the number of cycles of the power battery in multiple sub-time periods within the preset time period; the control module is further configured to determine the available charge / discharge influence parameter corresponding to each sub-time period based on the number of cycles of the power battery in the multiple sub-time periods, and determine the average value of the multiple available charge / discharge influence parameters as the charge / discharge influence parameter.

[0027] Optionally, the thermal conductivity includes a first thermal conductivity and a second thermal conductivity; the third acquisition module is further configured to acquire the first thermal conductivity of the power battery at the start of the preset time period and the second thermal conductivity of the power battery at the end of the preset time period; the control module is further configured to determine the component aging influence parameters based on the first thermal conductivity and the second thermal conductivity.

[0028] Optionally, the third acquisition module is further configured to acquire a first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, a second temperature at the outlet of the coolant flow channel, a third temperature of the coolant, and a fourth temperature of the battery pack of the power battery during a heating period of battery charging, and determine the thermal conductivity based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0029] Optionally, the health status includes a first health status and a second health status; the third acquisition module is further configured to acquire the first health status of the power battery at the start of the preset time period and the second health status of the power battery at the end of the preset time period; the control module is further configured to determine the attenuation influence parameter based on the first health status and the second health status.

[0030] Optionally, the third acquisition module is further configured to acquire the change value of the open circuit voltage of the power battery during a deep charging period, the deep charging period including a first resting period from when the vehicle is disconnected from the power supply to when the battery starts charging, a battery charging period, and a second resting period from when the battery finishes charging to when the vehicle is connected to the power supply, and acquire the change value of the actual stored capacity of the power battery during the deep charging period, and determine the health status based on the change value of the open circuit voltage and the change value of the actual stored capacity.

[0031] Optionally, the control module is further configured to, when the battery state parameter is less than a preset value, control the power battery to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system; or, when the battery state parameter is greater than the preset value, control the power battery to lower the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0032] According to a third aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the above-described thermal management method for a power battery.

[0033] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising:

[0034] A memory on which computer programs are stored;

[0035] A processor is used to execute the computer program in the memory to implement the steps of the above-described thermal management method for power batteries.

[0036] According to a fifth aspect of the present disclosure, a vehicle is provided, including the electronic equipment described in the fourth aspect.

[0037] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0038] This disclosure enables the acquisition of the vehicle's external ambient temperature and the charging / discharging data of the vehicle's power battery within a preset time period. It also acquires the performance parameters of the power battery at the start and end times of the preset time period. Based on the external ambient temperature, the charging / discharging data, and the performance parameters, it controls the power battery to execute a thermal management strategy. This approach considers the vehicle's external environmental conditions during a period, the battery's charging / discharging status, and the performance parameters resulting from changes in the battery's chemical properties before and after that time period. By comprehensively considering multiple factors that may cause changes in battery performance, it configures a thermal management strategy that matches the actual state of the power battery. This solves problems such as accelerated battery lifespan degradation and battery performance decline, reduces driver operating costs, and improves vehicle safety and driver comfort.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0041] Figure 1 This is a flowchart illustrating a thermal management method for a power battery according to an exemplary embodiment.

[0042] Figure 2 This is a flowchart illustrating another thermal management method for a power battery according to an exemplary embodiment.

[0043] Figure 3 This is a block diagram illustrating a thermal management device for a power battery according to an exemplary embodiment.

[0044] Figure 4 This is a structural block diagram of an electronic device according to an exemplary embodiment.

[0045] Figure 5 This is a structural block diagram of a vehicle according to an exemplary embodiment. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0047] In related technologies, in order to maintain the performance of power batteries, a fixed thermal management strategy is usually configured to control the internal temperature of the battery. However, the operation of the vehicle under different external environmental conditions and the changes in the chemical properties of the power battery itself over time may affect the execution effect of the configured thermal management strategy, causing problems such as accelerated battery life decay and battery performance degradation, increasing the cost of battery replacement for drivers, and battery performance may also affect driving safety.

[0048] To address the aforementioned issues, this disclosure provides the ability to acquire the external ambient temperature of the vehicle and the charging / discharging data of the vehicle's power battery within a preset time period. It also acquires the performance parameters of the power battery at the start and end times of the preset time period and controls the power battery to execute a thermal management strategy based on the external ambient temperature, the charging / discharging data, and the performance parameters. This approach considers the external environmental conditions of the vehicle's operation over a period of time, the battery's charging / discharging status, and the performance parameters resulting from changes in the battery's chemical properties before and after that time period. By comprehensively considering multiple factors that may cause changes in battery performance, a thermal management strategy matching the actual state of the power battery is configured. This solves problems such as accelerated battery lifespan degradation and battery performance decline, reduces the cost of battery replacement for drivers, and improves vehicle safety and driver comfort.

[0049] Figure 1 This is a flowchart illustrating a thermal management method for a power battery according to an exemplary embodiment, such as... Figure 1 As shown, the method may include:

[0050] In step S11, the target external ambient temperature of the vehicle within a preset time period is obtained.

[0051] In some embodiments, multiple external ambient temperatures within the preset time period can be obtained, and the average value of the multiple external ambient temperatures can be used as the target external ambient temperature.

[0052] The external ambient temperature can be obtained through a temperature sensor mounted on the vehicle body or by querying a cloud database; this disclosure does not limit its acquisition. The preset time period can be 30 days; for example, the daily ambient temperature over 30 days can be obtained, and the average daily ambient temperature can be used as the target ambient temperature. It should be noted that the value of this preset time period is merely illustrative and is not limited in this disclosure.

[0053] In step S12, the charging and discharging data of the power battery within the preset time period are obtained.

[0054] The charge and discharge data may include the number of charge and discharge cycles that the power battery completes. A charge and discharge cycle is a cycle that completes one battery discharge process and one battery charge process. For example, if the power battery completes one battery discharge process and one battery charge process, the number of cycles can be determined as 1.

[0055] In step S13, the performance parameters of the power battery at the end of the preset time period are obtained.

[0056] The endpoint time may include the start and end times of the preset time period.

[0057] In some embodiments, the performance parameter may include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery.

[0058] In some embodiments, the thermal conductivity can be obtained by acquiring a first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, a second temperature at the outlet of the coolant flow channel, a third temperature of the coolant, and a fourth temperature of the battery pack of the power battery during a heating period of battery charging, and determining the thermal conductivity based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0059] The heating period during battery charging can be the time during which the battery pack is heated to maintain its performance when charging a power battery in a low-temperature environment. During this period, coolant is injected into the coolant flow channels of the cooling system to control the battery heating temperature.

[0060] For example, the thermal conductivity can be calculated using the following formula:

[0061]

[0062] Where h is the thermal conductivity, Cp is the specific heat capacity of the coolant, g is the flow rate of the coolant, T1 is the first temperature, T2 is the second temperature, T3 is the third temperature, and T4 is the fourth temperature.

[0063] In some embodiments, the health status can be obtained by: obtaining the change value of the open circuit voltage of the power battery during a deep charging period, the deep charging period including a first rest period from when the vehicle is disconnected from the power supply to when the battery starts charging, a battery charging period, and a second rest period from when the battery finishes charging to when the vehicle is connected to the power supply; obtaining the change value of the actual stored capacity of the power battery during the deep charging period; and determining the health status based on the change value of the open circuit voltage and the change value of the actual stored capacity.

[0064] The first and second resting periods can be between 1 and 2 hours. Additionally, the change in the battery's open-circuit voltage (ΔVoc) can be obtained using a battery monitoring device installed in the vehicle, and the change in the battery's actual stored capacity (ΔCap) can be obtained using a capacity measuring instrument installed in the vehicle.

[0065] For example, based on the change in open-circuit voltage ΔVoc, and using the fitted curve of open-circuit voltage versus battery SOC (State of Charge, remaining capacity) from historical data, the change in battery SOC ΔSOC can be determined, and the health status can be calculated using the following formula:

[0066]

[0067] Wherein, SOH represents the health status, ΔCap represents the change in actual stored capacity, ΔSOC represents the change in SOC of the battery, and Cap0 represents the stored capacity of the battery at the time of manufacture, which can be obtained by consulting the factory parameters.

[0068] It should be noted that the method for determining the SOC change value can refer to the fitting curve of open circuit voltage and SOC in related technologies, which will not be elaborated here.

[0069] In step S14, the power battery is controlled to perform a thermal management strategy based on the target external ambient temperature, the charge and discharge data, and the performance parameters.

[0070] By adopting the above solution, the external ambient temperature of the vehicle and the charging and discharging data of the vehicle's power battery within a preset time period can be obtained. The performance parameters of the power battery at the start and end of the preset time period can also be acquired. Based on the external ambient temperature, the charging and discharging data, and the performance parameters, the power battery can be controlled to execute a thermal management strategy. This approach takes into account the external environmental conditions of the vehicle's operation over a period of time, the battery's charging and discharging status, and the performance parameters due to changes in the battery's chemical properties before and after that time period. By comprehensively considering multiple factors that may cause changes in battery performance, a thermal management strategy that matches the actual state of the power battery can be configured. This solves problems such as accelerated battery life degradation and battery performance decline, reduces the cost of battery replacement for drivers, and improves vehicle safety and driver comfort.

[0071] In some embodiments, step S14 above may include:

[0072] S141. Determine the battery state parameters of the power battery based on the target external ambient temperature, the charge / discharge data, and the performance parameters.

[0073] Among them, the battery state parameter is used to characterize the degree of performance degradation of the power battery.

[0074] S142. Based on the battery state parameters, control the power battery to implement a thermal management strategy.

[0075] In some embodiments, when the battery state parameter is less than a preset value, the power battery can be controlled to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0076] For example, the preset value can be 1. When the battery state parameter is less than 1, it indicates that the battery operating environment is good and the thermal management requirements can be reduced. The first preset temperature threshold for activating the cooling function during battery charging can be increased, for example, from 25°C to 30°C. The second preset temperature threshold for activating the cooling function during battery discharging can be increased, for example, from 30°C to 35°C. The first preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system during battery charging can also be increased, for example, from 20°C to 25°C. The second preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system during battery discharging can also be increased, for example, from 25°C to 30°C.

[0077] In other embodiments, when the battery state parameter is greater than the preset value, the power battery can be controlled to reduce the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0078] For example, when the battery state parameter is greater than 1, it indicates that the battery operating environment is relatively harsh and thermal management performance needs to be improved. This can be achieved by lowering the first preset temperature threshold for activating the cooling function during battery charging, for example, lowering the first preset temperature threshold from 25°C to 20°C; lowering the second preset temperature threshold for activating the cooling function during battery discharging, for example, lowering the second preset temperature threshold from 30°C to 35°C; lowering the first preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system during battery charging, for example, lowering the first preset temperature from 20°C to 15°C; and lowering the second preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system during battery discharging, for example, lowering the second preset temperature from 25°C to 20°C.

[0079] In this way, it is possible to determine whether the thermal management requirements of the power battery need to be reduced or its thermal management performance needs to be improved based on the battery state parameters. By raising or lowering the preset temperature threshold for activating the cooling function of the cooling system during battery charging and discharging, and the preset temperature of the coolant at the inlet of the coolant flow channel, a thermal management strategy that is more matched to the actual state of the power battery can be configured. This solves problems such as accelerated battery life degradation and battery performance decline, and improves the safety of vehicle operation.

[0080] It should be noted that the preset temperature threshold and preset temperature in this thermal management strategy are merely illustrative examples and are not intended to limit the scope of this disclosure.

[0081] In some embodiments, step S141 includes:

[0082] S41. Determine the temperature influence parameters based on the external ambient temperature of the target.

[0083] The temperature influence parameter characterizes the degree of influence of the vehicle's external ambient temperature on the power battery.

[0084] In some embodiments, the average ambient temperature of a preset area within the preset time period can be obtained, and the temperature influence parameter can be determined based on the difference between the target external ambient temperature and the average ambient temperature.

[0085] The preset area can include the vehicle's operating area, which can be the entire province where the vehicle is located or the entire country. The average temperature within the preset area over a preset time period can be obtained by querying a meteorological platform database; for example, the average temperature of each province nationwide during that preset time period can be obtained daily. The temperature difference between the target external ambient temperature and the average ambient temperature can be calculated using the following formula:

[0086] ΔT=T a -T b

[0087] Where ΔT is the temperature difference, T a T represents the external ambient temperature of the target. b This represents the average ambient temperature.

[0088] In addition, the temperature influence parameters corresponding to the temperature difference can be obtained through the correspondence of temperature influence parameters. This correspondence can include the correspondence between different temperature differences and temperature influence parameters.

[0089] For example, the temperature difference is divided into four preset intervals, and different preset intervals of temperature difference correspond to different temperature influence parameters f1, as shown in the table below:

[0090]

[0091] Table 1

[0092] Referring to Table 1 above, when the temperature difference ΔT is in the range -3℃≤ΔT≤3℃, the temperature influence parameter f1 is 1.1; when the temperature difference ΔT is in the range -5℃≤ΔT<-3℃ or the range 3℃<ΔT≤5℃, the temperature influence parameter f1 is 1.3; when the temperature difference ΔT is in the range -10℃≤ΔT<-5℃ or the range 5℃<ΔT≤10℃, the temperature influence parameter f1 is 1.5; and when the temperature difference ΔT is in the range ΔT<-10℃ or the range ΔT>10℃, the temperature influence parameter f1 is 1.7.

[0093] This allows for the consideration of the impact of external ambient temperature on battery performance, resulting in more accurate calculation of battery state parameters and a better match between thermal management strategies and the actual battery state. This enhances the effectiveness of thermal management strategies and improves vehicle driving safety.

[0094] S42. Based on the charge and discharge data, determine the parameters affecting charge and discharge.

[0095] Among them, the charge and discharge effect parameter characterizes the degree of influence of the charging and discharging of the power battery on the power battery.

[0096] In some embodiments, the number of cycles of the power battery in multiple sub-time periods within the preset time period can be obtained. For the number of cycles of the power battery in multiple sub-time periods, the corresponding standby charge and discharge influence parameter in each sub-time period can be determined, and the average value of the multiple standby charge and discharge influence parameters can be determined as the charge and discharge influence parameter.

[0097] The sub-time period can be 1 day. The determination of the standby charge and discharge influence parameter can include: when the number of cycles is 0, the standby charge and discharge influence parameter is determined to be 0.8; when the number of cycles is 1, the standby charge and discharge influence parameter is determined to be 1; when the number of cycles is greater than 1, the standby charge and discharge influence parameter is determined to be 1.2. The average value of the standby charge and discharge influence parameter determined each day can be determined as the charge and discharge influence parameter f2.

[0098] This allows for the consideration of the impact of user charging and discharging frequency on battery performance, resulting in more accurate calculation of battery state parameters and a better match between thermal management strategies and the actual battery state. This enhances the effectiveness of thermal management strategies and improves vehicle driving safety.

[0099] S43. Based on the thermal conductivity, determine the parameters affecting component aging.

[0100] Among them, the aging effect parameter of this component characterizes the degree of impact of the aging of the thermal conductive components of the power battery on the power battery.

[0101] In some embodiments, the thermal conductivity may include a first thermal conductivity and a second thermal conductivity; the first thermal conductivity of the power battery at the beginning of the preset time period and the second thermal conductivity of the power battery at the end of the preset time period can be obtained, and the aging effect parameter of the component can be determined based on the first thermal conductivity and the second thermal conductivity.

[0102] The end time of the preset time period can be the current time, and the aging effect parameter of the component can be determined by the following formula:

[0103]

[0104] Where f3 is the aging effect parameter, h2 is the second thermal conductivity, and h1 is the first thermal conductivity. It should also be noted that the methods for determining the first and second thermal conductivity can refer to the methods for determining thermal conductivity described earlier, and will not be repeated here.

[0105] This allows for the consideration of the impact of battery heating components aging over time on battery performance, resulting in more accurate calculation of battery state parameters and a better match between thermal management strategies and the actual battery state. This enhances the effectiveness of thermal management strategies and improves vehicle driving safety.

[0106] S44. Based on this health status, determine the parameters affecting attenuation.

[0107] Among them, the degradation effect parameter characterizes the degree of impact of the degradation of the power battery's health state on the power battery.

[0108] In some embodiments, the health status includes a first health status and a second health status; the first health status of the power battery at the start of the preset time period and the second health status of the power battery at the end of the preset time period can be obtained, and the attenuation influence parameter can be determined based on the first health status and the second health status.

[0109] For example, the attenuation effect parameter can be determined using the following formula:

[0110]

[0111] Where f4 is the attenuation effect parameter, SOH2 is the second healthy state, SOH1 is the first healthy state, and S t The expected degradation values ​​of the battery's health status over a preset time period provided by the battery manufacturer can be obtained by referring to the factory specifications. Additionally, it should be noted that the methods for determining the first and second health states can refer to the methods for determining health states described earlier, and will not be repeated here.

[0112] This allows us to take into account the impact of the battery's health deterioration over time on battery performance, making the calculation of battery state parameters more accurate and the thermal management strategy more closely matched to the actual battery state. This can improve the effectiveness of the thermal management strategy and enhance vehicle driving safety.

[0113] S45. Determine the battery state parameters based on the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter.

[0114] In some embodiments, the product of the temperature effect parameter, the charge / discharge effect parameter, the component aging effect parameter, and the degradation effect parameter is used as the battery state parameter.

[0115] For example, the battery state parameter can be determined using the following formula:

[0116] f0 = f1 * f2 * f3 * f4

[0117] Where f0 is the battery state parameter, f1 is the temperature influence parameter, f2 is the charge / discharge influence parameter, f3 is the aging influence parameter, and f4 is the degradation influence parameter.

[0118] Figure 2 This is a flowchart illustrating another thermal management method for a power battery according to an exemplary embodiment, such as... Figure 2 As shown, the method includes:

[0119] S201. Obtain multiple external ambient temperatures of the vehicle within a preset time period.

[0120] The external ambient temperature can be obtained through temperature sensors on the vehicle body or by querying a cloud database. The preset time period can be 30 days.

[0121] S202. The average value of the multiple external ambient temperatures is taken as the target external ambient temperature.

[0122] S203. Obtain the average ambient temperature of the preset area within the preset time period.

[0123] The preset area may include the vehicle's operating area.

[0124] S204. Determine the temperature influence parameters based on the difference between the target's external ambient temperature and the average ambient temperature.

[0125] Specifically, the temperature influence parameters corresponding to the temperature difference can be obtained through the correspondence between temperature influence parameters. This correspondence can include the correspondence between different temperature differences and temperature influence parameters.

[0126] S205. Obtain the number of cycles of the power battery within multiple sub-time periods within the preset time period.

[0127] The charge-discharge cycle is a cycle that completes one battery discharge process and one battery charge process, and this sub-time period can be 1 day.

[0128] S206. For the number of cycles of the power battery within multiple sub-time periods, determine the corresponding standby charge / discharge impact parameters for each sub-time period.

[0129] Specifically, the standby charge / discharge influence parameter can be set to 0.8 when the number of cycles is 0; set to 1 when the number of cycles is 1; and set to 1.2 when the number of cycles is greater than 1.

[0130] S207. The average value of the multiple standby charging and discharging influence parameters is determined as the charging and discharging influence parameter.

[0131] S208. Obtain the first thermal conductivity of the power battery at the start of the preset time period and the second thermal conductivity at the end of the preset time period.

[0132] The thermal conductivity can be obtained through the following steps: obtaining the first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, the second temperature at the outlet of the coolant flow channel, the third temperature of the coolant, and the fourth temperature of the battery pack of the power battery during the heating period of a battery charging, and determining the thermal conductivity based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0133] S209. Determine the aging effect parameters of the component based on the first thermal conductivity and the second thermal conductivity.

[0134] The aging effect parameters of this component can be determined using the following formula:

[0135]

[0136] Where f3 is the aging effect parameter, h2 is the second thermal conductivity, and h1 is the first thermal conductivity.

[0137] S210. Obtain the first health state of the power battery at the start of the preset time period and the second health state at the end of the preset time period.

[0138] The health status is obtained through the following steps: obtaining the change value of the open circuit voltage and the change value of the actual stored capacity of the power battery during a deep charging period, and determining the health status based on the change value of the open circuit voltage and the change value of the actual stored capacity.

[0139] S211. Determine the attenuation influence parameters based on the first health state and the second health state.

[0140] The attenuation effect parameter can be determined using the following formula:

[0141]

[0142] Where f4 is the attenuation effect parameter, SOH2 is the second healthy state, SOH1 is the first healthy state, and S t The expected degradation value of battery health over a preset time period provided by the battery manufacturer can be obtained by referring to the factory parameters.

[0143] S212. The product of the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter is used as the battery state parameter.

[0144] The battery state parameters can be determined using the following formula:

[0145] f0 = f1 * f2 * f3 * f4

[0146] Where f0 is the battery state parameter, f1 is the temperature influence parameter, f2 is the charge / discharge influence parameter, f3 is the aging influence parameter, and f4 is the degradation influence parameter.

[0147] S213. When the battery state parameters are less than the preset value, control the power battery to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0148] The preset value can be 1.

[0149] S214. When the battery state parameter is greater than the preset value, control the power battery to reduce the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0150] By adopting the above scheme, it is possible to obtain the external ambient temperature of the vehicle and the charging and discharging data of the vehicle's power battery within a preset time period, and to obtain the thermal conductivity and health status of the power battery at the start and end of the preset time period. Based on the external ambient temperature, the temperature influence parameter of the effect of temperature on battery performance is determined; based on the charging and discharging data, the charging and discharging influence parameter of the effect of the number of charging and discharging cycles on battery performance is determined; based on the thermal conductivity, the aging influence parameter of the effect of the battery's heating components aging over time on battery performance is determined; based on the health status, the decay influence parameter of the effect of the power battery's health status decaying over time on battery performance is determined; and based on the comprehensive determination of the temperature influence parameter, charging and discharging influence parameter, aging influence parameter, and decay influence parameter, the battery status parameter is determined, and different thermal management strategies are controlled for the power battery based on the values ​​of the battery status parameters. In this way, the external environment of the vehicle operation over a period of time, the charging and discharging of the battery, and the changes in thermal conductivity and health status of the battery due to changes in its own chemical properties before and after that period can be taken into account. By comprehensively considering multiple factors that may cause changes in battery performance, a thermal management strategy that matches the actual state of the power battery can be configured, which solves problems such as accelerated battery life decay and battery performance degradation, reduces the driver's vehicle operating costs, and improves the safety of vehicle operation and the comfort of the driver.

[0151] It should be noted that the specific implementation of each step in the above embodiments can be found in the description of the relevant steps in the foregoing embodiments, and will not be repeated here.

[0152] Furthermore, for the sake of simplicity, the above method embodiments are described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions. For example, steps S201 to S204 and steps S205 to S207 are not limited to the order shown in the current embodiment; steps S205 to S207 can be executed first, followed by steps S201 to S204. Secondly, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0153] Figure 3 This is a block diagram illustrating a thermal management method apparatus for a power battery according to an exemplary embodiment, with reference to... Figure 3 The device includes:

[0154] The first acquisition module 301 is used to acquire the target external ambient temperature of the vehicle within a preset time period;

[0155] The second acquisition module 302 is used to acquire the charging and discharging data of the power battery within the preset time period;

[0156] The third acquisition module 303 is used to acquire the performance parameters of the power battery at the end point of the preset time period, the end point of which includes the start and end points of the preset time period.

[0157] The control module 304 is used to control the power battery to perform a thermal management strategy based on the target external ambient temperature, the charge and discharge data, and the performance parameters.

[0158] Optionally, the control module 304 is further configured to determine the battery state parameters of the power battery based on the target external ambient temperature, the charging and discharging data, and the performance parameters. The battery state parameters are used to characterize the degree of performance degradation of the power battery, and to control the power battery to perform a thermal management strategy based on the battery state parameters.

[0159] Optionally, the performance parameters include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery; the control module 304 is further configured to determine a temperature influence parameter based on the target external ambient temperature, the temperature influence parameter characterizing the degree of influence of the vehicle's external ambient temperature on the power battery, and to determine a charge-discharge influence parameter based on the charge-discharge data, the charge-discharge influence parameter characterizing the degree of influence of the power battery's charge-discharge on the power battery, and to determine a component aging influence parameter based on the thermal conductivity, the component aging influence parameter characterizing the degree of influence of the aging of the power battery's heat-conducting components on the power battery, and to determine a degradation influence parameter based on the health status, the degradation influence parameter characterizing the degree of influence of the degradation of the power battery's health status on the power battery, and to determine the battery status parameter based on the temperature influence parameter, the charge-discharge influence parameter, the component aging influence parameter, and the degradation influence parameter.

[0160] Optionally, the control module 304 is further configured to use the product of the temperature influence parameter, the charge / discharge influence parameter, the component aging influence parameter, and the degradation influence parameter as the battery state parameter.

[0161] Optionally, the first acquisition module 301 is further configured to acquire multiple external ambient temperatures within the preset time period, and take the average of the multiple external ambient temperatures as the target external ambient temperature, and acquire the average ambient temperature of a preset area within the preset time period, the preset area including the vehicle's operating area; the control module 304 is further configured to determine the temperature influence parameter based on the difference between the target external ambient temperature and the average ambient temperature.

[0162] Optionally, the charge / discharge data includes the number of charge / discharge cycles completed by the power battery; the second acquisition module 302 is further configured to acquire the number of cycles of the power battery in multiple sub-time periods within the preset time period; the control module 304 is further configured to determine the available charge / discharge influence parameter corresponding to each sub-time period based on the number of cycles of the power battery in the multiple sub-time periods, and determine the average value of the multiple available charge / discharge influence parameters as the charge / discharge influence parameter.

[0163] Optionally, the thermal conductivity includes a first thermal conductivity and a second thermal conductivity; the third acquisition module 303 is further configured to acquire the first thermal conductivity of the power battery at the start of the preset time period and the second thermal conductivity of the power battery at the end of the preset time period; the control module 304 is further configured to determine the aging effect parameters of the component based on the first thermal conductivity and the second thermal conductivity.

[0164] Optionally, the third acquisition module 303 is further configured to acquire a first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, a second temperature at the outlet of the coolant flow channel, a third temperature of the coolant, and a fourth temperature of the battery pack of the power battery during a heating period of battery charging, and determine the thermal conductivity based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0165] Optionally, the health status includes a first health status and a second health status; the third acquisition module 303 is further configured to acquire the first health status of the power battery at the start of the preset time period and the second health status of the power battery at the end of the preset time period; the control module 304 is further configured to determine the attenuation influence parameter based on the first health status and the second health status.

[0166] Optionally, the third acquisition module 303 is further configured to acquire the change value of the open circuit voltage of the power battery during a deep charging period, the deep charging period including a first rest period from when the vehicle is disconnected from the power supply to when the battery starts charging, a battery charging period, and a second rest period from when the battery finishes charging to when the vehicle is connected to the power supply, and to acquire the change value of the actual stored capacity of the power battery during the deep charging period, and to determine the health status based on the change value of the open circuit voltage and the change value of the actual stored capacity.

[0167] Optionally, the control module 304 is further configured to, when the battery state parameter is less than a preset value, control the power battery to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system; or, when the battery state parameter is greater than the preset value, control the power battery to lower the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

[0168] Using the above-mentioned device, it is possible to acquire the external ambient temperature of the vehicle and the charging and discharging data of the vehicle's power battery within a preset time period, and to acquire the thermal conductivity and health status of the power battery at the start and end times of the preset time period. Based on the external ambient temperature, it can determine the temperature influence parameter of the effect of temperature on battery performance; based on the charging and discharging data, it can determine the charging and discharging influence parameter of the effect of the number of charging and discharging cycles on battery performance; based on the thermal conductivity, it can determine the aging influence parameter of the effect of the battery's heating components aging over time on battery performance; based on the health status, it can determine the decay influence parameter of the effect of the power battery's health status decaying over time on battery performance; and based on the comprehensive determination of the temperature influence parameter, charging and discharging influence parameter, aging influence parameter, and decay influence parameter, it can determine the battery status parameter, and control the power battery to implement different thermal management strategies according to the value of the battery status parameter. In this way, the external environment of the vehicle operation over a period of time, the charging and discharging of the battery, and the changes in thermal conductivity and health status of the battery due to changes in its own chemical properties before and after that period can be taken into account. By comprehensively considering multiple factors that may cause changes in battery performance, a thermal management strategy that matches the actual state of the power battery can be configured, which solves problems such as accelerated battery life decay and battery performance degradation, reduces the driver's vehicle operating costs, and improves the safety of vehicle operation and the comfort of the driver.

[0169] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0170] Figure 4 This is a block diagram illustrating an electronic device 400 according to an exemplary embodiment. Figure 4 As shown, the electronic device 400 may include a processor 401 and a memory 402. The electronic device 400 may also include one or more of a multimedia component 403, an input / output interface 404, and a communication component 405.

[0171] The processor 401 controls the overall operation of the electronic device 400 to complete all or part of the steps in the aforementioned thermal management method for the power battery. The memory 402 stores various types of data to support the operation of the electronic device 400. This data may include, for example, instructions for any application or method operating on the electronic device 400, and application-related data such as contact data, sent and received messages, pictures, audio, video, etc. The memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. Multimedia component 403 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in memory 402 or transmitted via communication component 405. The audio component also includes at least one speaker for outputting audio signals. Input / output interface 404 provides an interface between processor 401 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual or physical buttons. Communication component 405 is used for wired or wireless communication between the electronic device 400 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IoT, eMTC, 5G, etc., or one or more combinations thereof, is not limited here. Therefore, the corresponding communication component 405 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0172] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described thermal management method for the power battery.

[0173] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the above-described thermal management method for a power battery. For example, the computer-readable storage medium may be the memory 402 including program instructions, which may be executed by the processor 401 of the electronic device 400 to complete the above-described thermal management method for a power battery.

[0174] Figure 5 This is a structural block diagram of a vehicle 500 according to an exemplary embodiment, the vehicle 500 including the aforementioned electronic device 400.

[0175] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0176] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0177] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A thermal management method for a power battery, characterized in that, The method includes: Obtain the target external ambient temperature of the vehicle within a preset time period; Obtain the charging and discharging data of the power battery within the preset time period; Obtain the performance parameters of the power battery at the end point of the preset time period, wherein the end point includes the start and end points of the preset time period; Based on the target external ambient temperature, the charging and discharging data, and the performance parameters, the power battery is controlled to execute a thermal management strategy. The step of controlling the power battery to perform a thermal management strategy based on the target external ambient temperature, the charge / discharge data, and the performance parameters includes: Based on the target external ambient temperature, the charge and discharge data, and the performance parameters, the battery state parameters of the power battery are determined, and the battery state parameters are used to characterize the degree of performance degradation of the power battery. Based on the battery state parameters, the power battery is controlled to execute a thermal management strategy; The performance parameters include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery; determining the battery status parameters of the power battery based on the target external ambient temperature, the charge / discharge data, and the performance parameters includes: Based on the target external ambient temperature, temperature influence parameters are determined, which characterize the degree of influence of the vehicle's external ambient temperature on the power battery. Based on the charge and discharge data, charge and discharge influence parameters are determined, which characterize the degree of influence of the charge and discharge of the power battery on the power battery. Based on the thermal conductivity, the component aging impact parameters are determined, which characterize the degree of impact of the aging of the thermally conductive components of the power battery on the power battery. Based on the health status, a degradation impact parameter is determined, which characterizes the degree of impact of the degradation of the power battery's health status on the power battery. The battery state parameters are determined based on the temperature influence parameters, the charge / discharge influence parameters, the component aging influence parameters, and the degradation influence parameters. The step of controlling the power battery to perform a thermal management strategy based on the battery state parameters includes: Based on the battery state parameters, the preset temperature threshold for activating the cooling function of the cooling system during battery charging and discharging, and the preset temperature of the coolant at the inlet of the coolant flow channel are increased or decreased.

2. The method according to claim 1, characterized in that, The step of determining the battery state parameters based on the temperature influence parameters, the charge / discharge influence parameters, the component aging influence parameters, and the degradation influence parameters includes: The product of the temperature-affecting parameter, the charge-discharge-affecting parameter, the component aging-affecting parameter, and the degradation-affecting parameter is used as the battery state parameter.

3. The method according to claim 1, characterized in that, The acquisition of the target external ambient temperature of the vehicle within a preset time period includes: Obtain multiple external ambient temperatures within the preset time period; The average value of the multiple external ambient temperatures is taken as the target external ambient temperature; The step of determining the temperature influence parameters based on the target external ambient temperature includes: The average ambient temperature of a preset area within the preset time period is obtained, and the preset area includes the operating area of ​​the vehicle. The temperature influence parameter is determined based on the difference between the target external ambient temperature and the average ambient temperature.

4. The method according to claim 1, characterized in that, The charge / discharge data includes the number of charge / discharge cycles completed by the power battery; determining the charge / discharge influence parameters based on the charge / discharge data includes: Obtain the number of cycles of the power battery within multiple sub-time periods within the preset time period; For the number of cycles of the power battery within multiple sub-time periods, determine the corresponding standby charge / discharge impact parameters for each sub-time period; The average value of the plurality of pending charge and discharge influence parameters is determined as the charge and discharge influence parameter.

5. The method according to claim 1, characterized in that, The thermal conductivity includes a first thermal conductivity and a second thermal conductivity; determining the aging effect parameters of the component based on the thermal conductivity includes: Obtain the first thermal conductivity of the power battery at the start of the preset time period; Obtain the second thermal conductivity of the power battery at the end of the preset time period; The aging effect parameters of the component are determined based on the first thermal conductivity and the second thermal conductivity.

6. The method according to claim 5, characterized in that, The thermal conductivity was obtained in the following way: The first temperature at the inlet of the coolant flow channel in the cooling system of the power battery, the second temperature at the outlet of the coolant flow channel, the third temperature of the coolant, and the fourth temperature of the battery pack of the power battery are obtained during a heating period of battery charging. The thermal conductivity is determined based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

7. The method according to claim 1, characterized in that, The health status includes a first health status and a second health status; determining the attenuation effect parameter based on the health status includes: Obtain the first health state of the power battery at the start of the preset time period; Obtain the second health status of the power battery at the end of the preset time period; The attenuation effect parameter is determined based on the first health state and the second health state.

8. The method according to claim 7, characterized in that, The health status is obtained through the following methods: The change in open-circuit voltage of the power battery during a deep charging period is obtained. The deep charging period includes a first resting period from when the vehicle is disconnected from the power supply to when the battery starts charging, a battery charging period, and a second resting period from when the battery finishes charging to when the vehicle is connected to the power supply. Obtain the change in the actual stored capacity of the power battery during the deep charging period; The health status is determined based on the change in the open-circuit voltage and the change in the actual stored power.

9. The method according to claim 1, characterized in that, The preset temperature threshold for activating the cooling function of the cooling system during battery charging and discharging, and the preset temperature of the coolant at the inlet of the coolant flow channel, based on the battery state parameters, include: When the battery status parameters are less than a preset value, the power battery is controlled to raise the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system. When the battery state parameter is greater than the preset value, the power battery is controlled to reduce the preset temperature threshold for activating the cooling function of the cooling system and the preset temperature of the coolant at the inlet of the coolant flow channel in the cooling system.

10. A thermal management device for a power battery, characterized in that, The device includes: The first acquisition module is used to acquire the target external ambient temperature of the vehicle within a preset time period; The second acquisition module is used to acquire the charging and discharging data of the power battery within the preset time period; The third acquisition module is used to acquire the performance parameters of the power battery at the end point of the preset time period, wherein the end point includes the start and end points of the preset time period. The control module is used to control the power battery to execute a thermal management strategy based on the target external ambient temperature, the charging and discharging data, and the performance parameters. The control module is also used to determine the battery state parameters of the power battery based on the target external ambient temperature, the charging and discharging data and the performance parameters. The battery state parameters are used to characterize the degree of performance degradation of the power battery, and to control the power battery to execute a thermal management strategy based on the battery state parameters. The performance parameters include the thermal conductivity of the heat-conducting components of the power battery and the health status of the power battery; the control module is further configured to determine temperature influence parameters based on the target external ambient temperature, wherein the temperature influence parameters characterize the degree of influence of the vehicle's external ambient temperature on the power battery; determine charge and discharge influence parameters based on the charge and discharge data, wherein the charge and discharge influence parameters characterize the degree of influence of the power battery's charge and discharge on the power battery; determine component aging influence parameters based on the thermal conductivity, wherein the component aging influence parameters characterize the degree of influence of the aging of the power battery's heat-conducting components on the power battery; determine degradation influence parameters based on the health status, wherein the degradation influence parameters characterize the degree of influence of the degradation of the power battery's health status on the power battery; and determine the battery status parameters based on the temperature influence parameters, the charge and discharge influence parameters, the component aging influence parameters, and the degradation influence parameters. The control module is also used to raise or lower the preset temperature threshold for activating the cooling function of the cooling system during battery charging and discharging and the preset temperature of the coolant at the inlet of the coolant flow channel, based on the battery state parameters.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-9.

12. An electronic device, characterized in that, include: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-9.

13. A vehicle, characterized in that, Includes the electronic device as described in claim 12.

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