Thermal management method, thermal management system, storage medium, and vehicle

Abstract

The application discloses a kind of thermal management method, thermal management system, storage medium and vehicle, thermal management method includes: S1, setting sampling time period r;S2, the temperature data, voltage data and current data of battery in sampling time period r are acquired;S3, according to the temperature data, voltage data and current data of battery in sampling time period r obtains battery state comprehensive value FG;S4, contrast FG and set battery state threshold E, if FG>E, then determine that battery is in abnormal state, control thermal management system enters battery heat exchange capacity adjustment state, if FG≤E, then maintain thermal management system operating state. According to the thermal management method of the application, the state of battery is determined by the temperature data, voltage data and current data of battery, which can improve the accuracy of battery state determination of thermal management system, thereby improving the adaptation degree of heat exchange strategy of thermal management system and working state of battery, and improving the safety of battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a thermal management method, a thermal management system, a storage medium and a vehicle. BACKGROUND

[0002] With the rapid development and popularization of new energy vehicles, new energy vehicles also face a series of technical challenges, and the safety of new energy batteries is a major concern. Among them, the temperature regulation of the battery thermal management system on the battery is more important to the safety of the battery. With the change of the battery working condition, the heat exchange strategy of the thermal management system on the battery also needs to be changed. In the related art, the heat exchange strategy of the thermal management system is poorly adapted to the battery working condition, affecting the safety of the battery. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a thermal management method which can improve the accuracy of battery state determination.

[0004] The present application also proposes a thermal management system applying the above-mentioned thermal management method.

[0005] The present application also proposes a storage medium.

[0006] The present application also proposes a vehicle.

[0007] According to the thermal management method of the first aspect of the present application, S1, a sampling time period r is set; S2, temperature data, voltage data and current data of the battery in the sampling time period r are obtained; S3, a battery state comprehensive value FG in the sampling time period r is obtained according to the temperature data, voltage data and current data of the battery in the sampling time period r; S4, FG is compared with a set battery state threshold value E, if FG>E, it is determined that the battery is in an abnormal state, and the thermal management system is controlled to enter a battery heat exchange amount adjustment state, if FG≤E, the working state of the thermal management system is maintained.

[0008] According to the thermal management method of the first aspect of the present application, the state of the battery is determined by comprehensively considering the temperature data, voltage data and current data of the battery, which can improve the accuracy of the battery state determination of the thermal management system, thereby improving the adaptation degree of the heat exchange strategy of the thermal management system to the working state of the battery and improving the safety of the battery.

[0009] According to some embodiments of the present application, the battery heat exchange amount adjustment state comprises: S41, a temperature overrun degree value D in each sampling time period r is obtained according to the temperature data of the battery, D satisfies the following equation: Wherein, the temperature overrun refers to the deviation of the temperature of the battery from the normal temperature range, k represents the kth temperature overrun time region in the time period r, ND This indicates that there are a total of N within the time period r. D There is a temperature exceedance time range, where q0(k) represents the starting time point of temperature exceedance time range k. A (k) represents the end time point of the temperature exceedance time region k, w k (a) represents the battery temperature at each time point within the temperature exceedance time range k; S42, determine the value of D. If D > 0, control the vehicle to cool the battery; if D ≤ 0, control the vehicle to heat the battery.

[0010] According to some embodiments of the present invention, step S42 includes: if D > 0, rounding up D / h to obtain the number of temperature over-limit ranges s, and controlling the vehicle's cooling power to s*R rated cooling power; if D ≤ 0, rounding up -D / h to obtain the number of temperature over-limit ranges s, and controlling the vehicle's heating power to s*R rated heating power, wherein s*R < T, T is the set temperature adjustment threshold, h is the set temperature over-limit threshold, and R is the adjustment percentage.

[0011] According to some embodiments of the present invention, step S3 includes: S31, obtaining the battery temperature state change value Sd based on the battery temperature data, obtaining the battery voltage state change value Ua based on the battery voltage data, and obtaining the battery charge state change value So based on the battery current data; S32, obtaining FG through the following equation: FG(r)=k1Sd(r)+k2Ua(r)+k3So(r), where k1+k2+k3=1.

[0012] According to some embodiments of the present invention, Sd is obtained by the following equation: Among them, w r (a) represents the battery temperature value at time point a within time period r, where a represents the a-th time point within time period r, A represents the total number of time points within time period r, and the duration of time period r is t, c represents a constant, and D represents the degree of temperature exceedance; D is obtained through the following equation: Here, temperature exceeding the limit refers to the battery temperature deviating from the normal temperature range, k represents the k-th temperature exceeding the limit time region within the time period r, and N D This indicates that there are a total of N within the time period r. D There is a temperature exceedance time range, where q0(k) represents the starting time point of temperature exceedance time range k. A (k) represents the end time point of the temperature exceedance time region k, w k (a) represents the battery temperature at each time point within the temperature exceedance time range k.

[0013] According to some embodiments of the present invention, Ua is obtained by the following equation: wherein U represents a battery rated voltage value in a time period r, and B is a voltage overrun degree value; B is obtained by the following equation: wherein the voltage overrun refers to a voltage of the battery deviating from a normal voltage range, p0(j) represents a starting time point of a voltage overrun time region j, p A (j) represents a terminal time point of the voltage overrun time region j, d j (a) represents a battery output power at each time point in the voltage overrun time region j.

[0014] According to some embodiments of the present application, So is obtained by the following equation: wherein z r (a) represents a battery output current value at a time point a in the time period r, c represents a constant, and F is a current overrun degree value; F is obtained by the following equation: wherein the current overrun refers to a current of the battery deviating from a normal current range, o0(m) represents a starting time point of a current overrun time region m, o A (m) represents a terminal time point of the current overrun time region m, z m (a) represents a battery output current at each time point in the current overrun time region m, and I represents a center value of the normal current range.

[0015] According to the thermal management system of the second aspect of the present application, the thermal management method according to the first aspect of the present application is applied, and the thermal management system comprises: a battery state monitoring module, the battery state monitoring module comprises: a temperature monitoring unit, a voltage monitoring unit, a current monitoring unit and a battery state monitoring unit, the temperature monitoring unit is used for monitoring a battery temperature; the voltage monitoring unit is used for monitoring a battery voltage, the current monitoring unit is used for monitoring a battery current, and the battery state monitoring unit is electrically connected with the temperature monitoring unit, the voltage monitoring unit and the current monitoring unit respectively; a thermal management control module, the thermal management control module comprises: a judgment unit and a control unit, the judgment unit is electrically connected with the battery state monitoring unit to determine a battery state, and the control unit is electrically connected with the judgment unit, and the control unit is adapted to control a heat exchange amount of the battery.

[0016] According to the thermal management system of the second aspect of the present application, by applying the thermal management method according to the first aspect of the present application, the adaptation degree of the heat exchange strategy of the thermal management system to the battery working condition can be improved, so as to improve the safety of the battery.

[0017] According to the storage medium of the third aspect of the present application, the storage medium stores a thermal management control program, and the thermal management control program is executed to realize the thermal management method according to the first aspect of the present application.

[0018] The storage medium according to the third aspect of the present application can realize the thermal management method according to the first aspect of the present application, thereby improving the safety of the battery during the operation of the vehicle.

[0019] The vehicle according to the fourth aspect of the present application comprises the thermal management system according to the second aspect of the present application or the storage medium according to the third aspect of the present application.

[0020] The vehicle according to the fourth aspect of the present application, by comprising the thermal management system according to the second aspect of the present application or the storage medium according to the third aspect of the present application, can improve the safety of the vehicle.

[0021] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a flow chart of the thermal management control method according to an embodiment of the present application;

[0023] Figure 2 is a flow chart of the battery heat exchange amount adjustment state shown in Figure 1 DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout. The embodiments described below are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0025] Reference is made below to Figure 1 and Figure 2 describes the thermal management method according to an embodiment of the first aspect of the present application.

[0026] As shown in Figure 1 , the thermal management method according to an embodiment of the first aspect of the present application comprises:

[0027] S1, setting a sampling time period r.

[0028] During the operation of the vehicle, a time period r is divided every r time on the time axis.

[0029] S2, obtaining temperature data, voltage data and current data of the battery in the sampling time period r.

[0030] ​The temperature data includes battery temperature, change of battery temperature, and comparison of battery temperature with normal battery temperature, and the voltage data includes battery voltage, change of battery voltage, and comparison of battery voltage with normal battery voltage, and the current data includes battery current, change of battery current, and comparison of battery current with normal current.

[0031] S3, obtaining a battery state comprehensive value FG in the sampling time period r according to the temperature data, the voltage data, and the current data of the battery in the sampling time period r.

[0032] The battery state comprehensive value FG comprehensively quantifies the temperature data, the voltage data, and the current data of the battery, and quantifies the working state of the battery.

[0033] S4, comparing the FG with a set battery state threshold value E,

[0034] If the FG is greater than the E, it is determined that the battery is in an abnormal state, and the heat management system is controlled to enter a battery heat exchange amount adjustment state,

[0035] If the FG is less than or equal to the E, the working state of the heat management system is maintained.

[0036] When the FG is greater than the E, it is determined that the current working state of the battery deviates greatly from the theoretical normal working state of the battery, and the heat management system adjusts the heat exchange amount of the battery, so as to change the temperature of the battery. When adjusting the heat exchange amount, the battery can be cooled or heated.

[0037] It can be understood that the battery voltage, the battery temperature, and the battery current are data parameters that are strongly related to the working state of the battery in the process of working of the battery. The battery state comprehensive value FG is obtained according to the temperature data, the voltage data, and the current data of the battery, and the heat management system of the vehicle refers to the value of the FG to determine the battery state, so that the determined battery state is more in line with the actual working condition of the battery.

[0038] In actual application, the value of the FG is usually set in an interval greater than 0 and less than 1, and the value of the E is set between 0.5 and 0.7.

[0039] According to the heat management method of the first aspect of the present application, the state of the battery is determined by comprehensively considering the temperature data, the voltage data, and the current data of the battery, which can improve the accuracy of the determination of the battery state by the heat management system, thereby improving the adaptation of the heat exchange strategy of the heat management system to the working state of the battery, and improving the safety of the battery.

[0040] In some embodiments of the present application, as shown in FIG. 1, Figure 2 The battery heat exchange amount adjustment state includes:

[0041] S41, obtaining a temperature overrun degree value D in each sampling time period r according to the temperature data of the battery, D satisfying the following equation:

[0042]

[0043] wherein the temperature overrun refers to the temperature of the battery deviating from a normal temperature range, k represents the kth temperature overrun time zone in the time period r, N D represents that there are N D temperature overrun time zones in the time period r, q0(k) represents a starting time point of the temperature overrun time zone k, q A (k) represents an ending time point of the temperature overrun time zone k, w k (a) represents the battery temperature at each time point in the temperature overrun time zone k;

[0044] S42, determining the D value,

[0045] if D>0, controlling the vehicle to cool the battery,

[0046] if D≤0, controlling the vehicle to heat the battery.

[0047] Thus, the degree of the battery temperature deviating from the normal temperature range in the time period r can be quantified, when D>0, the degree of the battery temperature exceeding the normal temperature is high, at this time, the battery needs to be cooled, and the thermal management system of the vehicle enters the refrigeration mode; when D≤0, the degree of the battery temperature being lower than the normal battery temperature is high, at this time, the battery needs to be heated, and the thermal management system of the vehicle enters the heating mode.

[0048] In actual application, it is found that the normal temperature range of the battery is 15℃-35℃, that is, the battery needs to be cooled when the battery temperature exceeds 35℃, and the battery needs to be heated when the battery temperature is lower than 15℃.

[0049] In some embodiments of the present application, step S42 comprises:

[0050] if D>0, obtaining the number s of temperature overrun ranges by rounding up D / h, and controlling the refrigeration power of the vehicle to be s*R rated refrigeration power,

[0051] if D≤0, obtaining the number s of temperature overrun ranges by rounding up -D / h, and controlling the heating power of the vehicle to be s*R rated heating power,

[0052] wherein s*R

[0053] Preferably, the thermal management system exchanges heat with the battery through a heat pump, and when adjusting the heat exchange amount of the battery, the adjustment of the heating or cooling power of the heat pump is realized by adjusting the opening degree of the electronic expansion valve, for example, s can be 1, 2, 3, 4 or 5, and the opening degree of the corresponding electronic expansion valve is R, 2R, 3R, 4R or 5R. Thus, the quantitative control of the battery heat exchange amount adjustment can be realized.

[0054] In actual application, in order to make the thermal management system more stable, R is between 5% and 10%, and T is between 80% and 90%, for example, when T is 80%, the power of the thermal management system for adjusting the battery temperature does not exceed 80% of the rated power.

[0055] In some embodiments of the present application, step S3 comprises:

[0056] S31, obtaining a battery temperature state change value Sd according to the temperature data of the battery, a battery voltage state change value Ua according to the voltage data of the battery, and a battery state of charge change value So according to the current data of the battery;

[0057] S32, obtaining FG through the following equation:

[0058] FG(r)=k1Sd(r)+k2Ua(r)+k3So(r), wherein k1+k2+k3=1.

[0059] Sd can quantify the change of the battery temperature state, and the value of Sd is greater than 0 and less than 1, when Sd tends to 0, it indicates that the possibility of the battery temperature deviating from the normal temperature range tends to 0, and when Sd tends to 1, it indicates that the possibility of the battery temperature deviating from the normal temperature range tends to 1.

[0060] Ua can quantify the change of the battery voltage state, and the value of Ua is greater than 0 and less than 1, when Ua tends to 0, it indicates that the possibility of the battery voltage deviating from the normal voltage range tends to 0, and when Ua tends to 1, it indicates that the possibility of the battery voltage deviating from the normal voltage range tends to 1.

[0061] So can quantify the change of the battery state of charge, and the value of So is greater than 0 and less than 1, when So tends to 0, it indicates that the possibility of the battery current deviating from the normal current range tends to 0, and when So tends to 1, it indicates that the possibility of the battery current deviating from the normal current range tends to 1.

[0062] In the process of actual application, the range of k1 is usually 0.5-0.6, the range of k2 is usually 0.3-0.4, and the range of k3 is usually 0.1-0.2.

[0063] In some embodiments of the present application, Sd is obtained through the following equation:

[0064]

[0065] wherein, w r (a) represents the battery temperature value at time point a in time period r, a represents the a-th time point in time period r, A represents that there are A time points in total in time period r, and the length of time period r is t, c represents a constant, and D is the temperature overrun degree value;

[0066] D is obtained by the following equation:

[0067]

[0068] wherein, the temperature overrun refers to that the temperature of the battery deviates from the normal temperature range, k represents the k-th temperature overrun time region in time period r, N D represents that there are N D temperature overrun time regions in total in time period r, q0(k) represents the starting time point of temperature overrun time region k, q A (k) represents the ending time point of temperature overrun time region k, w k (a) represents the battery temperature at each time point in temperature overrun time region k.

[0069] Thus, the Sd value can be obtained, and in the working process of the thermal management system, the temperature monitoring unit monitors the battery temperature and calculates the Sd value through the above equation, and the battery state monitoring unit calculates the FG value by using the Sd value calculated by the temperature monitoring unit.

[0070] In actual application, it is found that the normal temperature range of the battery is 15℃-35℃, and in the application of the above equation, 15℃ and 35℃ are preferably taken as the lower limit and the upper limit of the normal temperature range respectively to calculate Sd.

[0071] In some embodiments of the present application, Ua is obtained by the following equation:

[0072]

[0073] wherein, U represents the battery rated voltage value in time period r, and B is the voltage overrun degree value;

[0074] B is obtained by the following equation:

[0075]

[0076] wherein, the voltage overrun refers to that the voltage of the battery deviates from the normal voltage range, p0(j) represents the starting time point of voltage overrun time region j, p A (j) represents the ending time point of voltage overrun time region j, dj (a) represents the battery output power at each time point in the voltage out-of-limit time zone j.

[0077] Thus, the Ua value can be obtained. During the operation of the thermal management system, the voltage monitoring unit monitors the battery voltage and calculates the Ua value by using the above equation, and the battery state monitoring unit calculates the FG value by using the Ua value calculated by the voltage monitoring unit.

[0078] It can be understood that the rated voltage value U is in the normal voltage range. In practical applications, it is found that the normal voltage range of the battery cell is 2.8V-4.2V. When the Ua is calculated by using the above equation, the end value of the normal battery cell voltage range is used to calculate the end value of the voltage range of the battery according to the number of battery cells in series in the battery. For example, when the battery includes 96 battery cells, the normal voltage range of the battery is 268.8V-403.2V. The 268.8V and 403.2V are used as the lower limit and the upper limit of the normal voltage of the battery to calculate the Ua.

[0079] In some embodiments of the present application, the So is obtained by using the following equation:

[0080]

[0081] wherein z r (a) represents the battery output current value at time point a in time period r, c represents a constant, and F is the current out-of-limit degree value;

[0082] The F is obtained by using the following equation:

[0083]

[0084] wherein the current out-of-limit refers to the current of the battery deviating from the normal current range, o0(m) represents the starting time point of the current out-of-limit time zone m, o A (m) represents the ending time point of the current out-of-limit time zone m, z m (a) represents the battery output current at each time point in the current out-of-limit time zone m, and I represents the center value of the normal current range.

[0085] Thus, the So value can be obtained. During the operation of the thermal management system, the current monitoring unit monitors the battery current and calculates the So value by using the above equation, and the battery state monitoring unit calculates the FG value by using the So value calculated by the current monitoring unit.

[0086] In practical application, it is found that the current of the battery during charging and discharging is 1 to 3 times of the capacity of the battery. For example, the continuous current of a battery with a capacity of 60 kWh should be 60 A to 180 A, and the instantaneous peak value should not be greater than 300 A. When calculating So by using the above equation, 60 A and 180 A are used as the lower limit and the upper limit of the normal current to calculate So.

[0087] The thermal management system according to the second aspect of the present application applies the thermal management method according to the first aspect of the present application, and the thermal pipe system comprises a battery state monitoring module and a thermal management control module.

[0088] Specifically, the battery state monitoring module comprises a temperature monitoring unit, a voltage monitoring unit, a current monitoring unit and a battery state monitoring unit. The temperature monitoring unit is configured to monitor the temperature of the battery, the voltage monitoring unit is configured to monitor the voltage of the battery, the current monitoring unit is configured to monitor the current of the battery, and the battery state monitoring unit is electrically connected to the temperature monitoring unit, the voltage monitoring unit and the current monitoring unit. The thermal management control module comprises a judgment unit and a control unit. The judgment unit is electrically connected to the battery state monitoring unit to determine the state of the battery, and the control unit is electrically connected to the judgment unit and is adapted to control the heat exchange amount of the battery.

[0089] During the operation of the thermal management system, the temperature monitoring unit monitors the temperature of the battery and calculates the temperature data, the voltage monitoring unit monitors the voltage of the battery and calculates the voltage data, the current monitoring unit monitors the current of the battery and calculates the current data, the battery state monitoring unit calculates FG according to the temperature data obtained by the temperature monitoring unit, the voltage data obtained by the voltage monitoring unit and the current data obtained by the current monitoring unit, the judgment unit compares the FG value with the battery state threshold E to determine the state of the battery, and sends an instruction to the control unit according to the determination result, and the control unit controls the thermal management system to enter the battery heat exchange amount adjustment state according to the instruction from the judgment unit. Thus, the thermal management method according to the first aspect of the present application can be realized.

[0090] The thermal management system according to the second aspect of the present application applies the thermal management method according to the first aspect of the present application, and the thermal pipe system comprises a battery state monitoring module and a thermal management control module.

[0091] The storage medium according to the third aspect of the present application stores the thermal management control program, and the thermal management control program realizes the thermal management method according to the first aspect of the present application when executed.

[0092] The storage medium according to the third aspect of the present application can realize the thermal management method according to the first aspect of the present application, thereby improving the safety of the battery during the operation of the vehicle.

[0093] The vehicle according to the fourth aspect of the present application comprises the heat management system according to the second aspect of the present application or the storage medium according to the third aspect of the present application.

[0094] The vehicle according to the fourth aspect of the present application can improve the safety of the vehicle by comprising the heat management system according to the second aspect of the present application or the storage medium according to the third aspect of the present application.

[0095] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0096] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0097] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0098] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the description herein of certain examples does not necessarily exclude these examples from the scope of the application, and these examples can be combined with each other for the purpose of patentable inventions.

[0099] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.

Claims

1. A thermal management method, characterized by, The method comprises: S1, setting a sampling time period r; S2, obtaining temperature data, voltage data and current data of the battery within the sampling time period r; S3, obtaining a battery state comprehensive value FG within the sampling time period r according to the temperature data, voltage data and current data of the battery within the sampling time period r; S4, comparing FG and a set battery state threshold E, if FG>E, determining that the battery is in an abnormal state, and controlling the thermal management system to enter a battery heat exchange amount adjustment state, if FG≤E, maintaining the working state of the thermal management system; The battery heat exchange amount adjustment state comprises: S41, obtaining a temperature overrun degree value D within each sampling time period r according to the temperature data of the battery, D satisfying the following equation: ， wherein the temperature overrun indicates that the temperature of the battery deviates from a normal temperature range, k represents a kth temperature overrun time zone within a time period r, represents a total number of temperature overrun time zones within the time period r, represents a start time point of the temperature overrun time zone k, represents an end time point of the temperature overrun time zone k, represents a battery temperature at each time point within the temperature overrun time zone k;​ S42, determining the value of D, if D>0, controlling the vehicle to cool the battery, if D≤0, controlling the vehicle to heat the battery.

2. The thermal management method of claim 1, wherein, The step S42 comprises: if D>0, obtaining a temperature overrun range number s by rounding up D / h, and controlling the refrigeration power of the vehicle to be s*R rated refrigeration power, if D≤0, obtaining a temperature overrun range number s by rounding up -D / h, and controlling the heating power of the vehicle to be s*R rated heating power, wherein s*R 3. The thermal management method of claim 1, wherein, The step S3 comprises: S31, obtaining a battery temperature state change value Sd according to the temperature data of the battery, a battery voltage state change value Ua according to the voltage data of the battery, and a battery state of charge change value So according to the current data of the battery; S32, obtaining FG by the following equation: where k1+k2+k3=1.

4. The thermal management method of claim 3, wherein, Sd is obtained by the following equation: ， wherein, represents the battery temperature value at the time point a in the time period r, a represents the a-th time point in the time period r, A represents that the time period r contains A time points in total, the time length of the time period r is t, and c represents a constant.

5. The thermal management method of claim 3, wherein, Ua is obtained by the following equation: ， wherein U represents a battery rated voltage value within the time period r, and B is a voltage overrun degree value; B is obtained by the following equation: ， wherein the voltage excursion refers to the voltage of the battery deviating from a normal voltage range, j represents a jth voltage excursion time zone within a time period r, represents a total number of voltage excursion time zones within the time period r, represents a start time point of the voltage excursion time zone j, represents an end time point of the voltage excursion time zone j, represents a battery output power at each time point within the voltage excursion time zone j.​ 6. The thermal management method of claim 3, wherein, So is obtained by the following equation: ， wherein, represents the battery output current value at the time point a in the time period r, c represents a constant, and F is the current out-of-limit degree value; F is obtained by the following equation: ， wherein the current out-of-limit indicates that the current of the battery deviates from a normal current range, m represents the mth current out-of-limit time zone in the time period r, represents that a total of current out-of-limit time zones are owned in the time period r, represents a starting time point of the current out-of-limit time zone m, represents a terminal time point of the current out-of-limit time zone m, represents the battery output current at each time point in the current out-of-limit time zone m, and I represents a center value of the normal current range.

7. A thermal management system characterized by, The thermal management system comprises: a battery state monitoring module, the battery state monitoring module comprising: a temperature monitoring unit, a voltage monitoring unit, a current monitoring unit and a battery state monitoring unit, the temperature monitoring unit being used for monitoring the battery temperature; the voltage monitoring unit being used for monitoring the battery voltage, the current monitoring unit being used for monitoring the battery current, and the battery state monitoring unit being electrically connected with the temperature monitoring unit, the voltage monitoring unit and the current monitoring unit respectively; a thermal management control module, the thermal management control module comprising: a judgment unit and a control unit, the judgment unit being electrically connected with the battery state monitoring unit to determine the battery state, and the control unit being electrically connected with the judgment unit, and the control unit being adapted to control the heat exchange amount of the battery.

8. A storage medium characterized by, The storage medium stores a thermal management control program, and the thermal management control program is executed to realize the thermal management method of any one of claims 1-6.

9. A vehicle characterized by comprising: The thermal management system of claim 7 or the storage medium of claim 8. ​

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