CN118024962A - Thermal management method, device, equipment and storage medium for direct current charging of power battery - Google Patents

Abstract

The application discloses a thermal management method, a device, electronic equipment and a computer readable storage medium for direct current charging of a power battery, wherein the method comprises the following steps: calculating the optimal temperature interval of the power battery in each electric quantity state according to the charging power meter of the power battery and the charging capacity of the charging pile; calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from preset electric quantity to target electric quantity according to the optimal temperature interval of the power battery in the initial electric quantity and battery parameters; and judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval, the electric quantity interval without cooling and the temperature interval without cooling corresponding to the current electric quantity of the power battery so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped. The application solves the problem of increasing the charging energy consumption of the vehicle in a high-temperature direct current quick charging/normal-temperature direct current quick charging scene, so as to maintain the temperature of the power battery in an optimal temperature range and improve the charging rate of the power battery.

Description

Thermal management method, device, equipment and storage medium for direct current charging of power battery

Technical Field

The application relates to the technical field of thermal management of batteries of new energy automobiles, in particular to a thermal management method and device for direct current charging of a power battery, electronic equipment and a computer readable storage medium.

Background

The temperature of the power battery of the new energy automobile determines the charging rate, the charging rate influences the vehicle endurance under the same charging time, the proper temperature of the power battery determines the faster charging rate, and when the temperature of the power battery is higher than the optimal charging temperature upper limit value in a high-temperature direct-current fast charging/normal-temperature direct-current fast charging scene, the cooling of the battery thermal management system is required to be started so as to radiate heat of the power battery, and the temperature of the power battery is reduced to an optimal charging temperature interval. In the traditional thermal management strategy, a threshold method is generally adopted for control, and whether the heating and cooling of the battery thermal management system are started or not is judged according to the actual temperature of the power battery, so that the power battery is subjected to auxiliary heating or auxiliary cooling through the battery thermal management system, the temperature of the power battery is maintained in a proper temperature range, and the charging rate of the power battery is improved.

However, the conventional high-temperature direct current fast charge/normal-temperature direct current fast charge thermal management strategy has a small current charge condition, the power battery is in an optimal charge temperature interval, and the cooling of the thermal management system is started when the heat productivity of the battery is small, so that the temperature of the power battery is not in the optimal charge temperature interval, the charge rate is reduced, and the energy consumption is increased; or when the power battery is in the optimal charging temperature interval under the condition of heavy current charging, high water temperature cooling is started or is not started when the heat productivity of the battery is large, so that the temperature of the power battery is too fast to be maintained in the optimal charging temperature interval, and the charging rate is reduced.

Disclosure of Invention

In view of the above, the present application provides a thermal management method, a device, an electronic device and a computer readable storage medium for dc charging of a power battery, which are used for solving the problem of increasing the charging energy consumption of a vehicle in a high Wen Zhiliu fast charging/normal temperature dc fast charging scenario, so as to maintain the temperature of the power battery in an optimal temperature interval and improve the charging rate of the power battery.

According to an aspect of an embodiment of the present application, there is provided a thermal management method of direct current charging of a power battery, the method including:

Calculating an optimal temperature interval of the power battery in each electric quantity state according to the charging power meter of the power battery and the charging capacity of the charging pile;

Calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from preset electric quantity to target electric quantity according to the optimal temperature interval of the power battery in initial electric quantity and battery parameters of the power battery;

And judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery, so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

In an optional manner, the calculating the optimal temperature interval of the power battery in each electric quantity state according to the charging power table of the power battery and the charging capability of the charging pile further includes:

Looking up the charging rate table to obtain the maximum allowable charging current of the power battery in a corresponding electric quantity state;

comparing the maximum allowable charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual maximum charging current of the power battery in the corresponding electric quantity state;

And looking up the corresponding current of the charging power meter in the corresponding electric quantity state of the power battery, and obtaining a temperature interval when the corresponding current of the power battery in the corresponding electric quantity state is larger than or equal to the actual maximum charging current, so as to be used as an optimal temperature interval of the power battery in the corresponding electric quantity state.

In an optional manner, the calculating the cooling-free electric quantity interval and the cooling-free temperature interval of the power battery from the preset electric quantity to the target electric quantity according to the optimal temperature interval of the power battery in the initial electric quantity and the battery parameter of the power battery further includes:

Acquiring battery parameters of the power battery; wherein, the battery parameters of the power battery comprise internal resistance, specific heat capacity and mass;

Calculating the temperature rise of the power battery from the preset electric quantity to the target electric quantity according to the battery parameters of the power battery;

Summing and calculating the optimal temperature interval lower limit value corresponding to the initial electric quantity of the power battery and the temperature rise of the power battery from the preset electric quantity to the target electric quantity to obtain the upper limit value of the power battery without cooling;

And obtaining a cooling-free temperature interval of the charging pile according to the optimal temperature interval lower limit value corresponding to the initial electric quantity of the power battery and the cooling-free temperature upper limit value of the power battery, and obtaining a corresponding cooling-free electric quantity interval according to the preset electric quantity and the target electric quantity of the power battery.

In an alternative, the method further comprises:

acquiring a working temperature interval of the power battery;

Judging whether the upper limit value of the working temperature interval of the power battery is larger than the upper limit value of the cooling-free temperature interval or not so as to obtain a first judging result;

judging whether the lower limit value of the working temperature interval of the power battery is larger than the lower limit value of the optimal temperature interval or not so as to obtain a second judging result;

And determining a cooling-free temperature interval when the power battery is charged according to the first judging result and the second judging result.

In an alternative, the method further comprises:

acquiring a working temperature interval of the power battery;

and taking the upper limit value of the working temperature interval of the power battery as the upper limit value of the cooling-free temperature interval.

In an optional manner, the determining the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery and the cooling-free electric quantity interval and the cooling-free temperature interval of the power battery to control the auxiliary heating system in the battery thermal management system to be turned on/off or the cooling system to be turned on/off further includes:

judging whether the current temperature of the power battery is in a corresponding optimal temperature interval or not;

If the current temperature is smaller than the lower limit value of the optimal temperature interval, controlling an auxiliary heating system in the battery thermal management system to be started;

if the current temperature is greater than the upper limit value of the optimal temperature interval, controlling a cooling system in a battery thermal management system to be started;

if the current temperature is in the optimal temperature interval, judging whether the current electric quantity of the power battery is in the electric quantity interval without cooling;

If the current electric quantity of the power battery is smaller than the lower limit value of the electric quantity interval without cooling, a cooling system in a battery thermal management system is controlled to be started;

If the current electric quantity of the power battery is in the electric quantity interval without cooling, judging whether the current temperature of the power battery is in the temperature interval without cooling;

if the current temperature is greater than the upper limit value of the temperature interval without cooling, controlling a cooling system in a battery thermal management system to be started;

And if the current temperature is in the temperature interval without cooling, controlling a cooling system in the battery thermal management system to be closed.

In an alternative, the method further comprises:

and if the power battery is charged and stopped or the power battery is charged to the target electric quantity, controlling an auxiliary heating system and a cooling system in the battery thermal management system to be closed.

According to another aspect of an embodiment of the present application, there is provided a thermal management device for direct current charging of a power battery, the device including:

The first calculation module is used for calculating the optimal temperature interval of the power battery in each electric quantity state according to the charging power table of the power battery and the charging capacity of the charging pile;

The second calculation module is used for calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from the preset electric quantity to the target electric quantity according to the optimal temperature interval of the power battery in the initial electric quantity and the battery parameter of the power battery;

And the control module is used for judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

According to another aspect of an embodiment of the present application, there is provided an electronic apparatus including:

A controller;

And the memory is used for storing one or more programs, and when the one or more programs are executed by the controller, the controller realizes the thermal management method for the direct current charging of the power battery.

According to yet another aspect of embodiments of the present application, there is provided a computer readable storage medium having stored therein at least one executable instruction that, when run on a power battery direct current charged thermal management device/electronic device, causes the power battery direct current charged thermal management device/electronic device to perform the operations of the power battery direct current charged thermal management method as described above.

The thermal management method for direct current charging of the power battery in the embodiment of the application is that when a user carries out direct current charging on a vehicle through a direct current charging pile, the vehicle obtains the charging capacity of the charging pile, so that the optimal temperature interval of the power battery of the vehicle in each electric quantity state is calculated based on the charging capacity of the charging pile and a charging multiplying power meter of the power battery of the vehicle, the optimal temperature interval comprises the optimal temperature interval of an initial circuit of the power battery, and then the cooling-free electric quantity interval and the cooling-free temperature interval of the power battery of the vehicle from preset electric quantity to target electric quantity are calculated according to the optimal temperature interval of the initial electric quantity of the power battery and battery parameters of the power battery; and finally, judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery and combining the electric quantity interval without cooling and the temperature interval without cooling of the power battery to determine whether the current electric quantity of the power battery is in the electric quantity interval without cooling and whether the current temperature of the power battery is in the optimal temperature interval and the temperature interval without cooling, thereby controlling the auxiliary heating system in the battery thermal management system to be started/stopped or controlling the cooling system to be started/stopped. According to the technical scheme, the auxiliary heating system and the cooling system of the battery thermal management system in the vehicle are subjected to switch control by combining the charging capacity of the charging pile, the charging power meter of the power battery, the optimal temperature interval of the power battery in each electric quantity state, the power battery cooling-free electric quantity interval and the cooling temperature interval during vehicle charging, so that the problem that the vehicle charging energy consumption is increased in a high-temperature direct-current fast charging/normal-temperature direct-current fast charging scene can be solved, the temperature of the power battery is maintained in the optimal temperature interval, and the charging rate of the power battery is improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following specific embodiments of the present application are given for clarity and understanding.

Drawings

The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic flow chart of a thermal management method for DC charging of a power battery according to an embodiment of the application;

FIGS. 2-6 are schematic diagrams illustrating coordinates of an embodiment of the present charge and present temperature determination in the thermal management method for DC charging of a power battery according to the present application;

FIG. 7 is a flow chart illustrating an embodiment of step 100 in FIG. 1;

FIG. 8 is a flow chart illustrating an embodiment of step 200 of FIG. 1;

FIG. 9 is a schematic diagram of a thermal management device for DC charging of a power battery according to an embodiment of the present application;

fig. 10 shows a schematic structural diagram of an embodiment of the electronic device provided by the application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.

The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

In the present application, the term "plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Firstly, it should be noted that the temperature of the power battery of the new energy automobile determines the charging rate, the charging rate affects the duration of the vehicle under the same charging time, and the appropriate temperature of the power battery determines the faster charging rate, when the temperature of the power battery is higher than the optimal charging temperature upper limit value in the high-temperature direct-current fast charging/normal-temperature direct-current fast charging scene, the cooling of the battery thermal management system needs to be started to dissipate heat of the power battery, so that the temperature of the power battery is reduced to the optimal charging temperature interval. In the traditional thermal management strategy, a threshold method is generally adopted for control, and whether the heating and cooling of the battery thermal management system are started or not is judged according to the actual temperature of the power battery, so that the power battery is subjected to auxiliary heating or auxiliary cooling through the battery thermal management system, the temperature of the power battery is maintained in a proper temperature range, and the charging rate of the power battery is improved.

In a high Wen Zhiliu quick charge/normal temperature direct current quick charge scene, a small current charge condition exists, the power battery is in an optimal charge temperature interval, and the cooling of the thermal management system is started when the heat productivity of the battery is small, so that the temperature of the power battery is not in the optimal charge temperature interval, the charge rate is reduced, and the energy consumption is increased; or when the power battery is in the optimal charging temperature interval under the condition of heavy current charging, high water temperature cooling is started or is not started when the heat productivity of the battery is large, so that the temperature of the power battery is too fast to be maintained in the optimal charging temperature interval, and the charging rate is reduced.

At present, a threshold method is adopted to control a vehicle direct current charging thermal management strategy conventionally as follows:

(1) If the temperature T of the power battery is more than or equal to a cooling start temperature threshold T1, judging that the power battery enters a cooling grade L1, and requesting a target water temperature Tw1 of a battery thermal management system; if the temperature T of the power battery is more than or equal to the cooling start temperature threshold T2, the power battery is judged to enter a cooling level L2, and the inlet water temperature Tw2 of the battery thermal management system is requested (wherein T2 is more than T1, and Tw2 is less than or equal to Tw 1).

If the temperature T of the power battery is less than or equal to T1-DeltaT (DeltaT: temperature hysteresis area), or the electric quantity of the power battery reaches the target electric quantity, or the charging is stopped, the cooling of the power battery is judged to be stopped.

Therefore, the traditional threshold method is adopted to control the direct-current charging thermal management strategy of the vehicle, and whether the battery thermal management system is started for cooling or heating is judged according to the temperature of the power battery, the self heat generation of the power battery and the state of the power battery are not fully considered, and the temperature of the power battery is not flexibly regulated and controlled according to the pile end capacity of the charging pile, the charging power meter, the heating value of the power battery in the charging process and other parameters, so that the temperature of the power battery cannot be continuously in an optimal charging temperature range, the charging rate is reduced, and the energy consumption is increased.

In order to solve the above-mentioned problems, referring to fig. 1 for details, the present application exemplarily shows a flowchart of a thermal management method for dc charging of a power battery.

The main execution body of the thermal management method for direct current charging of the power battery may be a terminal device or a server or other processing devices, where the terminal device may be a User Equipment (UE), a computer, a mobile device, a User terminal, a cellular phone, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, and the like. The main execution body of the thermal management method for direct current charging of the power battery can also be an automobile. In some possible implementations, the thermal management method of direct current charging of the power battery may be implemented by way of a processor invoking computer readable instructions stored in a memory.

Specifically, the thermal management method for direct current charging of the power battery of the embodiment includes the following steps:

And 100, calculating the optimal temperature interval of the power battery in each electric quantity state according to the charging rate table of the power battery and the charging capacity of the charging pile.

The charging rate meter is a charging map meter, and refers to a charging meter for recording the charging current rate of the power battery under different terminal voltages and different temperature conditions. The charging capability of the charging pile can be that the charging pile can output the charging current, the charging voltage, the charging power and the like to the vehicle through the charging gun when the charging gun of the charging pile is connected with the charging port of the vehicle. The current electric quantity of the power battery is the electric quantity of the battery remained by the power battery of the vehicle when the user connects the vehicle to the charging gun to start charging.

Based on the charging power meter of the power battery and the charging capacity of the charging pile, an optimal temperature interval of the power battery in any electric quantity state can be calculated, so that the vehicle can adjust the thermal management strategy of direct current charging of the power battery in an adaptive manner.

For example, if the electric quantity of the power battery is 30%, the charging capacity of the charging pile is 200A, the charging voltage is 400V, and the charging power is 80KW/h, then it is necessary to look up a table of the charging power of the power battery at 30%, and calculate the optimal temperature interval of the power battery at 30% by combining the charging capacity of the charging pile with the charging current of 200A, the charging voltage is 400V, and the charging power is 80 KW/h.

In this embodiment, the optimal temperature interval may be an adaptive temperature interval for charging the vehicle power battery under the condition of meeting the user requirement and controlling the charging energy consumption and the charging cost.

It should be noted that, in the charging process of the power battery, the temperature of the power battery is continuously changed along with time, and the temperature rise of the power battery along with the charging time can be calculated according to the battery parameters, the current temperature, the ambient temperature and the like of the power battery, so as to obtain a specific temperature state when the power battery is charged from the current electric quantity to the target electric quantity.

And 200, calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from the preset electric quantity to the target electric quantity according to the optimal temperature interval of the power battery in the initial electric quantity and the battery parameters of the power battery.

The initial electric quantity of the power battery is the residual electric quantity of the power battery of the vehicle when the user connects the vehicle with the charging gun; the preset electric quantity of the power battery is any electric quantity value of the initial electric quantity and the target electric quantity, the preset electric quantity can be equal to the initial electric quantity or the target electric quantity, the preset electric quantity is a calculated starting point of electric quantity calculation of a selected power battery in a power battery interval without cooling and a power battery temperature interval without cooling; the battery parameters of the power battery may include specific heat capacity, mass, resistance, etc. of the power battery.

In this embodiment, since different charging piles are used for charging a power battery of a vehicle, different charging currents, charging voltages, charging powers, charging temperatures and the like exist, a power battery is charged from a preset power level to a target power level, a power level interval which does not need to cool the power battery and a temperature interval which does not need to cool the power battery exist, and the power battery is not required to cool the power battery when the power level of the power battery is in the power level interval which does not need to cool the power battery and the temperature interval which does not need to cool the power battery, so that the power battery can achieve a better charging rate.

And 300, judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery, so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

The battery thermal management system may refer to a battery thermal management liquid cooling system, or may refer to other thermal management systems such as a heat pump air conditioning system, a PTC thermal management system, etc., which are not specifically limited herein according to practical applications. The current electric quantity of the power battery can be the residual electric quantity of the power battery when the user parks the vehicle on the charging pile and is connected with the charging gun to prepare for charging, and the current electric quantity of the power battery can also be the residual electric quantity of the vehicle at any moment in the charging process; similarly, the current temperature is also the real-time temperature of the power battery when the vehicle is connected with the charging gun to be charged, and the current temperature of the power battery can also be the real-time temperature of the vehicle when the vehicle corresponds to the residual electric quantity at any moment in the charging process. That is, the technical scheme of the application can judge any electric quantity state and corresponding temperature in the charging process of the power battery so as to adaptively control the on/off of an auxiliary heating system or the on/off of a cooling system in the battery thermal management system. It should be appreciated that the current charge and current temperature of the power cell may be obtained directly from corresponding sensors on the vehicle, and will not be described in detail herein.

In this embodiment, the vehicle is charged quickly by the dc charging stake only for a short time. Illustratively, the charge time for the user to charge the vehicle may be 0.25 hours, 0.4 hours, 0.5 hours, 0.75 hours, etc. However, under the conventional technical scheme, in the process of performing direct current fast charging on the power battery of the vehicle, generally, when the electric quantity of the power battery is low, the charging pile outputs a large current to charge the power battery of the vehicle, and when the electric quantity of the power battery is about to be full, for example, when the power battery is charged to 85%, in order to perform charging protection on the power battery, the output current of the charging pile is reduced so as to charge the power battery of the vehicle through a small current. Therefore, in the process of direct current quick charge of the power battery of the vehicle, a large current charge condition and a small current charge condition exist, and in the small current charge condition of the power battery, the power battery may be in an optimal charge temperature interval and the heat productivity of the battery is small, but because of coping with the quick charge process, a cooling system of the thermal management system is started, so that the temperature of the power battery is not in the optimal charge temperature interval, the charge rate is reduced, and the energy consumption is increased. Under the condition of heavy current charging of the power battery, the power battery may be in an optimal charging temperature interval, but when the heating value of the power battery is large, high water temperature cooling is started or is not started, so that the temperature of the power battery rises too fast to be maintained in the optimal charging temperature interval, and the charging rate is reduced.

In order to solve the problems that the vehicle charging energy consumption is increased and the temperature of the power battery cannot be accurately maintained in an optimal temperature range in a high Wen Zhiliu quick charging/normal-temperature direct-current quick charging scene in the traditional technical scheme, the application judges the current electric quantity and the current temperature of the power battery according to the optimal temperature range corresponding to the current electric quantity state of the power battery, the power battery without cooling electric quantity range and the power battery without cooling temperature range when the power battery is charged, so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped. Specifically:

Directly detecting the current temperature of the power battery in the current electric quantity state through a temperature sensor of the vehicle, and judging whether the current temperature of the power battery is in a corresponding optimal temperature interval in the electric quantity state; referring to fig. 2-6 in detail, if the current temperature of the power battery in the current state of charge is less than the lower limit value of the corresponding optimal temperature interval, it is indicated that the temperature of the power battery is low at this time, and the auxiliary heating system in the battery thermal management system needs to be controlled to be turned on to heat the power battery, so that the temperature of the power battery is raised to the optimal temperature interval corresponding to the current state of charge, thereby improving the charging rate of the power battery.

As shown in fig. 3, if the current temperature of the power battery in the current electric quantity state is greater than the upper limit value of the optimal temperature interval, it indicates that the temperature of the power battery is higher at this time, and a cooling system in the battery thermal management system needs to be controlled to be started to cool the power battery, so that the temperature of the power battery is reduced to the optimal temperature interval corresponding to the current electric quantity, thereby improving the charging rate of the power battery.

As shown in fig. 4, if the current temperature of the power battery in the current electric quantity state is in the optimal temperature interval, the current electric quantity of the power battery needs to be further judged from the electric quantity interval without cooling, specifically, whether the current electric quantity of the power battery is in the electric quantity interval without cooling is judged; if the current electric quantity of the power battery is smaller than the lower limit value of the electric quantity interval without cooling, the current electric quantity of the power battery is indicated to be controlled to start a cooling system in the battery thermal management system, and heat dissipation of the power battery is increased.

As shown in fig. 5, if the current electric quantity of the power battery is in the cooling-unnecessary electric quantity interval, that is, the current electric quantity of the power battery is greater than the lower limit value of the cooling-unnecessary electric quantity interval, the current temperature of the power battery and the cooling-unnecessary temperature interval need to be further judged, specifically, whether the current temperature of the power battery is in the cooling-unnecessary temperature interval is judged; if the current temperature of the power battery is greater than the upper limit value of the temperature interval without cooling, the current temperature of the power battery is indicated to be controlled to start a cooling system in a battery thermal management system at the moment, and heat dissipation of the power battery is increased; as shown in fig. 6, if the current temperature of the power battery is in the cooling-unnecessary temperature interval, that is, the current temperature of the power battery is less than the upper limit value of the cooling-unnecessary temperature interval, it indicates that the cooling system in the battery thermal management system needs to be controlled to be turned off at this time.

It should be noted that, the power battery is charged to each electric quantity, whether the corresponding electric quantity state starts an auxiliary heating system or a cooling system in the battery thermal management system is judged, so that accurate control of any electric quantity state in the power battery charging process is realized, any electric quantity of the power battery can be maintained in an optimal temperature interval, the problem that the vehicle charging energy consumption is increased in a high-temperature direct-current fast charging/normal-temperature direct-current fast charging scene is controlled, and the charging rate of the power battery is improved.

According to the technical scheme, the charging capacity of the charging pile, the charging power meter of the power battery, the optimal temperature interval of the power battery in each electric quantity state, the power battery cooling-free electric quantity interval and the cooling-free temperature interval during vehicle charging are combined, the auxiliary heating system and the cooling system of the battery thermal management system in the vehicle are controlled to be started or shut down, the problems that the power battery cannot be started for cooling when the power battery is in high temperature, low in electric quantity and large in heating value and the charging time of the power battery is increased when the power battery is in heat dissipation are avoided, the problem that the power battery cannot be kept in the optimal charging temperature interval due to the fact that the power battery is started for cooling when the power battery is in normal temperature and small in heating value and the problem that the power battery is not in heat dissipation is caused, the charging time and the energy consumption of the power battery are increased are avoided, the temperature of the power battery can be continuously kept in the optimal temperature interval, and the charging rate of the power battery is improved.

Referring to fig. 7, fig. 7 is a flow chart illustrating a step 100 according to an exemplary embodiment of the present application. The thermal management method at least comprises steps 110 to 130, specifically:

step 110: looking up the charging rate table to obtain the maximum allowable charging current of the power battery in a corresponding electric quantity state;

The maximum allowable current is the maximum charging current allowed to be input by the power battery, which is displayed in a charging rate table when the power battery corresponds to the electric quantity, and the power battery of the vehicle is charged by the power battery of the vehicle, so that the input charging current cannot exceed the maximum charging current.

Step 120: comparing the maximum allowable charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual maximum charging current of the power battery in the corresponding electric quantity state;

When the charging gun of the charging pile is connected with the charging port of the vehicle for charging, after the vehicle is connected with the charging pile through handshaking communication, the charging pile can output voltage and current to the power battery of the vehicle for charging through the charging gun, and the vehicle can directly obtain the maximum output current of the charging pile at the moment, namely the maximum charging current of the charging pile.

Step 130: and looking up the corresponding current of the charging power meter in the corresponding electric quantity state of the power battery, and obtaining a temperature interval when the corresponding current of the power battery in the corresponding electric quantity state is larger than or equal to the actual maximum charging current, so as to be used as an optimal temperature interval of the power battery in the corresponding electric quantity state.

The actual maximum charging current is a small value in the maximum allowable charging current and the maximum charging current of the charging pile, so that the corresponding current of the corresponding electric quantity of the power battery is larger than or equal to the actual maximum charging current by looking up the charging rate table, and the temperature interval of the power battery in the corresponding electric quantity under the condition can be obtained, and the temperature interval at the moment is taken as the optimal temperature interval of the power battery in the corresponding electric quantity state. Based on the method, when the power battery is charged in the optimal temperature interval, the power battery can achieve better charging efficiency, and meanwhile, the energy consumption of single charging of the vehicle can be controlled, so that the cost is reduced.

For example, assuming that the corresponding state of charge of the power battery is SOC _x (x=1, 2 … … n; n is a preset SOC value of the power battery, if a preset charge target is not set, n=100 by default), the maximum allowable charge current of the lookup table in the preset state of charge is Imax0 _x (x=1, 2 … … n); comparing the maximum allowable charging current of the preset electric quantity state with the maximum charging current Imax pile of the charging pile to obtain a small value, namely MIN (Imax 0 _x, imax pile), so as to obtain the actual maximum charging current Imax _x (x=1, 2 … … n) of the power battery in each preset SOC value state; at this time, the power battery is checked by the charging rate table to satisfy the condition in the state of corresponding preset electric quantity SOC _x: i _{Theory of} ≥Imax_x (T1 _x,T2_x) as an optimal temperature interval (T1 _x,T2_x) of the power battery in the state of corresponding to the preset power amount SOC _x.

For example, assuming that the corresponding electric quantity of the power battery is 50%, the actual maximum charging current Imax _x is 28A, and the corresponding theoretical current I _{Theory of} in the corresponding electric quantity state lookup charging rate table is 30A, and the corresponding temperature is 30 ℃; when the corresponding theoretical current I _{Theory of} is 40A, the corresponding temperature is 34 ℃; when the corresponding theoretical current I _{Theory of} is 55A, the corresponding temperature is 39 ℃; when the corresponding theoretical current I _{Theory of} is 63A, the corresponding temperature is 42 ℃; then, at this time, the temperature interval in which the corresponding theoretical current is greater than or equal to the actual maximum charging current in the state in which the corresponding state of charge of the power battery is 50% is (30 ℃,42 ℃) as the optimal temperature interval for charging in the state in which the corresponding state of charge of the power battery is 50%. At this time, when the power battery is charged in the optimal temperature interval, the power battery can achieve better charging efficiency, and meanwhile, the energy consumption of single charging of the vehicle can be controlled, so that the cost is reduced.

Referring to fig. 8, fig. 8 is a flow chart illustrating a step 200 according to an exemplary embodiment of the present application. The thermal management method at least comprises steps 210 to 240, specifically:

Step 210: acquiring battery parameters of the power battery; wherein, the battery parameters of the power battery comprise internal resistance, specific heat capacity and mass;

step 220: calculating the temperature rise of the power battery from the preset electric quantity to the target electric quantity according to the battery parameters of the power battery;

it should be noted that, when the power battery is charged from the preset electric quantity to the target electric quantity, the temperature of the power battery is continuously changed along with time, and the temperature rise generated by the power battery can be calculated according to the internal resistance, specific heat capacity, mass and other battery parameters of the power battery, so as to obtain a specific temperature state when the power battery is charged from the preset electric quantity to the target electric quantity.

In this embodiment, the target electric quantity is any electric quantity in the charging process of the power battery, for example, the target electric quantity is 30%, 50%, 80%, etc., and is not particularly limited herein, if the target electric quantity is not set, the target electric quantity is directly defaulted to be 100%, and at this time, the temperature rise of the power battery from the preset electric quantity to the electric quantity of 100% is calculated.

For example, assume that the power battery is sequentially selected (SOC _x,T1_x) from the power battery's power level SOC ₁ as a calculation starting point, and the heat-generating temperature rise of the power battery charged to each power level is calculated, where x=1, 2 … … n, so as to obtain a heat-generating temperature rise curve of the power battery from the initial power level to the target power level; the preset electric quantity SOC _k of a power battery is selected from the heating and temperature rising curve, the lower limit value of the corresponding optimal temperature interval is T1 _k, when the power battery is charged to the target electric quantity SOCn from the state (SOC _k,T1_k), the temperature of the power battery at the target electric quantity SOC _n is T2 _n, namely, the temperature is calculated by a formula And calculating the temperature state of the power battery at the target electric quantity SOC _n. In this embodiment, R is the internal resistance of the power battery, Δt _x is the time (x=k, k+ … n-1) from the SOCx to the SOC _x+1 of the power battery, C is the specific heat capacity of the power battery, m is the mass of the power battery, n is the SOC value of the charging target, and if the charging target is not set, n=100 is defaulted.

It should be understood that, the initial state of charge of the power battery and the corresponding initial temperature state, where the initial temperature is the lower limit value of the optimal temperature interval of the power battery in the state of charge.

Step 230: summing and calculating the optimal temperature interval lower limit value corresponding to the preset electric quantity of the power battery and the temperature rise of the power battery charged from the preset electric quantity to the target electric quantity to obtain the upper limit value of the power battery without cooling;

In this embodiment, because the (SOCk, T1 k) heating temperature rise curve is selected and the heating value data of the power battery, that is, the lower limit value of the optimal temperature interval corresponding to the preset electric quantity of the power battery, and the upper limit of the cooling-free temperature of the power battery obtained by charging the power battery from the preset electric quantity to the target electric quantity is:

step 240: and obtaining a cooling-free temperature interval of the power battery according to the optimal temperature interval lower limit value corresponding to the initial electric quantity of the power battery and the cooling-free temperature upper limit value of the power battery, and obtaining a corresponding cooling-free electric quantity interval according to the preset electric quantity and the target electric quantity of the power battery.

In the present embodiment, the cooling-unnecessary temperature interval of the power battery is (T1 x, T20 x), and the cooling-unnecessary power interval is (SOCk, SOCn).

Based on the above embodiment, through setting the temperature interval without cooling and the electric quantity interval without cooling, the auxiliary heating system and the cooling system of the battery thermal management system can be controlled to be switched on and off more accurately in the charging process of the power battery, so that the problem that the charging energy consumption of the vehicle is increased in a high Wen Zhiliu quick-charging/normal-temperature direct-current quick-charging scene is solved.

Further, in order to alleviate the problem that the thermal management strategy cannot respond to the temperature change of the power battery in time during charging, the thermal management method for direct current charging of the power battery of the application further comprises the following steps: acquiring a working temperature interval of the power battery; judging whether the upper limit value of the working temperature interval of the power battery is larger than the upper limit value of the cooling-free temperature interval or not so as to obtain a first judging result; judging whether the lower limit value of the working temperature interval of the power battery is larger than the lower limit value of the optimal temperature interval or not to obtain a second judging result; and determining a cooling-free interval when the power battery is charged according to the first judging result and the second judging result.

Illustratively, if the operating temperature interval of the power cell is (-20 ℃,60 ℃), the cooling-unnecessary temperature interval is (15 ℃,35 ℃) and the optimal temperature interval is (10 ℃,40 ℃); the first judgment result is that the upper limit value 60 ℃ of the working temperature interval of the power battery is larger than the upper limit value 35 ℃ of the cooling-free temperature interval, the second judgment result is that the lower limit value-20 ℃ of the working temperature interval of the power battery is smaller than the lower limit value 10 ℃ of the optimal temperature interval, the temperature of the power battery in the charging process can be determined to be changed between (10 ℃ and 40 ℃) according to the first judgment result and the second judgment result, and the (10 ℃ and 60 ℃) can be used as the cooling-free interval of the power battery, so that the influence of the actual temperature difference of the power battery is avoided, and the temperature change of the power battery when a thermal management strategy cannot respond to the charging in time is relieved.

Further, acquiring a working temperature interval of the power battery; and taking the upper limit value of the working temperature interval of the power battery as the upper limit value of the cooling-free temperature interval. For example, if the operating temperature range of the power battery is (-20 ℃,60 ℃), the upper limit value of the operating temperature of the power battery is set to 60 ℃ as the upper limit value of the cooling-free temperature range, so as to avoid the influence of the actual temperature difference of the power battery.

In an embodiment, if the power battery is charged to a target electric quantity or the power battery is charged to a target electric quantity, the auxiliary heating system and the cooling system in the battery thermal management system are controlled to be turned off.

In this embodiment, when there is an abnormality in the power battery, or the charging pile is abnormal, or the user manually ends the charging, or the vehicle power battery is charged to the target power set by the user, the charging is stopped at this time, and the auxiliary heating system and the cooling system in the battery thermal management system are controlled to be closed, so that the increase of the energy consumption of the vehicle is avoided.

Fig. 9 is a schematic structural view showing an embodiment of a thermal management device for direct current charging of a power battery according to the present application. Referring to fig. 9, the thermal management device 400 for dc charging of a power battery includes: a first calculation module 410, a second calculation module 420, and a control module 430;

The first calculation module 410 is configured to calculate an optimal temperature interval of the power battery in each electric quantity state according to a charging rate table of the power battery and a charging capacity of a charging pile;

The second calculation module 420 is configured to calculate a cooling-free power interval and a cooling-free temperature interval when the power battery is charged from a preset power to a target power according to an optimal temperature interval of the power battery in an initial power and a battery parameter of the power battery;

the control module 430 is configured to determine, according to an optimal temperature interval corresponding to the current electric quantity state of the power battery, and the electric quantity interval without cooling and the temperature interval without cooling of the power battery, the current electric quantity and the current temperature of the power battery, so as to control on/off of an auxiliary heating system or on/off of a cooling system in the battery thermal management system.

It should be noted that, the thermal management device 400 for dc charging of a power battery provided in the foregoing embodiment is the same as the thermal management method for dc charging of a power battery provided in the foregoing embodiment, and the specific manner in which each module and unit perform the operation has been described in detail in the method embodiment, which is not repeated here.

Referring now to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of an electronic device according to the present application, which shows a schematic structural diagram of a computer system suitable for implementing the electronic device according to the embodiment of the present application, and the specific embodiment of the present application is not limited to the specific implementation of the electronic device.

Referring to fig. 10, the electronic device includes: a controller; and the memory is used for storing one or more programs, and when the one or more programs are executed by the controller, the thermal management method for the direct current charging of the power battery is executed.

With continued reference to fig. 10, the computer system 500 of the electronic device includes a central processing unit (Central Processing Unit, CPU) 501, which may perform various appropriate actions and processes, such as performing the methods in the above embodiments, according to a program stored in a Read-Only Memory (ROM) 502 or a program loaded from a storage portion 508 into a random access Memory (Random Access Memory, RAM) 503. In the RAM503, various programs and data required for the system operation are also stored. The CPU 501, ROM 502, and RAM503 are connected to each other through a bus 504. An Input/Output (I/O) interface 505 is also connected to bus 504.

The following components are connected to the I/O interface 505: an input section 506 including a keyboard, a mouse, and the like; an output portion 507 including a Cathode Ray Tube (CRT), a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD), and a speaker, etc.; a storage portion 508 including a hard disk and the like; and a communication section 509 including a network interface card such as a LAN (Local Area Network ) card, a modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The drive 510 is also connected to the I/O interface 505 as needed. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as needed so that a computer program read therefrom is mounted into the storage section 508 as needed.

In particular, according to embodiments of the present application, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising a computer program for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication portion 509, and/or installed from the removable media 511. When executed by a Central Processing Unit (CPU) 501, performs the various functions defined in the system of the present application.

Another aspect of the application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a thermal management method of direct current charging of a power battery as described above. The computer-readable storage medium may be included in the electronic device described in the above embodiment or may exist alone without being incorporated in the electronic device.

Another aspect of the application also provides a computer program product or computer program comprising at least one executable instruction that, when run on an electronic device, causes the electronic device to perform a thermal management method of direct current charging of a power battery, the method comprising:

Calculating an optimal temperature interval of the power battery in each electric quantity state according to the charging power meter of the power battery and the charging capacity of the charging pile;

Calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from preset electric quantity to target electric quantity according to the optimal temperature interval of the power battery in initial electric quantity and battery parameters of the power battery;

And judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery, so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

The thermal management method for direct current charging of the power battery in the embodiment of the application is that when a user carries out direct current charging on a vehicle through a direct current charging pile, the vehicle obtains the charging capacity of the charging pile, so that the optimal temperature interval of the power battery of the vehicle in each electric quantity state is calculated based on the charging capacity of the charging pile and a charging multiplying power meter of the power battery of the vehicle, the optimal temperature interval comprises the optimal temperature interval of an initial circuit of the power battery, and then the cooling-free electric quantity interval and the cooling-free temperature interval of the power battery of the vehicle from preset electric quantity to target electric quantity are calculated according to the optimal temperature interval of the initial electric quantity of the power battery and battery parameters of the power battery; and finally, judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery and combining the electric quantity interval without cooling and the temperature interval without cooling of the power battery to determine whether the current electric quantity of the power battery is in the electric quantity interval without cooling and whether the current temperature of the power battery is in the optimal temperature interval without cooling and the temperature interval without cooling, thereby controlling the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped. According to the technical scheme, the auxiliary heating system and the cooling system of the battery thermal management system in the vehicle are subjected to switch control by combining the charging capacity of the charging pile, the charging power meter of the power battery, the optimal temperature interval of the power battery in each electric quantity state, the power battery cooling-free electric quantity interval and the cooling temperature interval during vehicle charging, so that the problem that the vehicle charging energy consumption is increased in a high-temperature direct-current fast charging/normal-temperature direct-current fast charging scene can be solved, the temperature of the power battery is maintained in the optimal temperature interval, and the charging rate of the power battery is improved.

It should be noted that, the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium may be, for example, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present application, however, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with a computer-readable computer program embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Where each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units involved in the embodiments of the present application may be implemented by software, or may be implemented by hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.

According to an aspect of the embodiment of the present application, there is also provided a computer system including a central processing unit (Central Processing Unit, CPU) that can perform various appropriate actions and processes, such as performing the method in the above-described embodiment, according to a program stored in a Read-Only Memory (ROM) or a program loaded from a storage section into a random access Memory (Random Access Memory, RAM). In the RAM, various programs and data required for the system operation are also stored. The CPU, ROM and RAM are connected to each other by a bus. An Input/Output (I/O) interface is also connected to the bus.

The following components are connected to the I/O interface: an input section including a keyboard, a mouse, etc.; an output section including a Cathode Ray Tube (CRT), a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD), and a speaker; a storage section including a hard disk or the like; and a communication section including a network interface card such as a LAN (Local Area Network ) card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The drives are also connected to the I/O interfaces as needed. Removable media such as magnetic disks, optical disks, magneto-optical disks, semiconductor memories, and the like are mounted on the drive as needed so that a computer program read therefrom is mounted into the storage section as needed.

The foregoing is merely illustrative of the preferred embodiments of the present application and is not intended to limit the embodiments of the present application, and those skilled in the art can easily make corresponding variations or modifications according to the main concept and spirit of the present application, so that the protection scope of the present application shall be defined by the claims.

When the embodiment is applied, the related data collection and processing in the application should strictly acquire the informed consent or independent consent of the personal information body according to the requirements of the relevant national laws and regulations, and develop the subsequent data use and processing behaviors within the authorized range of the laws and regulations and the personal information body.

Claims (10)

1. A method of thermal management of direct current charging of a power battery, the method comprising:

Calculating an optimal temperature interval of the power battery in each electric quantity state according to the charging power meter of the power battery and the charging capacity of the charging pile;

Calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from preset electric quantity to target electric quantity according to the optimal temperature interval of the power battery in initial electric quantity and battery parameters of the power battery;

And judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery, so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

2. The method for thermal management of direct current charging of a power battery according to claim 1, wherein calculating an optimal temperature interval of the power battery in each state of charge according to a charging rate table of the power battery and a charging capacity of a charging pile, further comprises:

Looking up the charging rate table to obtain the maximum allowable charging current of the power battery in a corresponding electric quantity state;

comparing the maximum allowable charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual maximum charging current of the power battery in the corresponding electric quantity state;

And looking up the corresponding current of the charging power meter in the corresponding electric quantity state of the power battery, and obtaining a temperature interval when the corresponding current of the power battery in the corresponding electric quantity state is larger than or equal to the actual maximum charging current, so as to be used as an optimal temperature interval of the power battery in the corresponding electric quantity state.

3. The method according to claim 1, wherein calculating a cooling-free power interval and a cooling-free temperature interval for charging the power battery from a preset power to a target power according to the optimal temperature interval of the power battery at an initial power and the battery parameters of the power battery, further comprises:

Acquiring battery parameters of the power battery; wherein, the battery parameters of the power battery comprise internal resistance, specific heat capacity and mass;

Calculating the temperature rise of the power battery from the preset electric quantity to the target electric quantity according to the battery parameters of the power battery;

Summing and calculating the optimal temperature interval lower limit value corresponding to the initial electric quantity of the power battery and the temperature rise of the power battery from the preset electric quantity to the target electric quantity to obtain the upper limit value of the power battery without cooling;

And obtaining a cooling-free temperature interval of the power battery according to the optimal temperature interval lower limit value corresponding to the initial electric quantity of the power battery and the cooling-free temperature upper limit value of the power battery, and obtaining a corresponding cooling-free electric quantity interval according to the preset electric quantity and the target electric quantity of the power battery.

4. A method of thermal management of direct current charging of a power cell as defined in claim 3, further comprising:

acquiring a working temperature interval of the power battery;

Judging whether the upper limit value of the working temperature interval of the power battery is larger than the upper limit value of the cooling-free temperature interval or not so as to obtain a first judging result;

judging whether the lower limit value of the working temperature interval of the power battery is larger than the lower limit value of the optimal temperature interval or not so as to obtain a second judging result;

and determining a cooling-free interval when the power battery is charged according to the first judging result and the second judging result.

5. A method of thermal management of direct current charging of a power cell as defined in claim 3, further comprising:

acquiring a working temperature interval of the power battery;

and taking the upper limit value of the working temperature interval of the power battery as the upper limit value of the cooling-free temperature interval.

6. The method according to claim 1, wherein the determining the current power level and the current temperature of the power battery according to the optimal temperature interval corresponding to the current power level state of the power battery and the cooling-free power level interval and the cooling-free temperature interval of the power battery to control the auxiliary heating system in the battery thermal management system to be turned on/off or the cooling system to be turned on/off further comprises:

judging whether the current temperature of the power battery is in a corresponding optimal temperature interval or not;

If the current temperature is smaller than the lower limit value of the optimal temperature interval, controlling an auxiliary heating system in the battery thermal management system to be started;

if the current temperature is greater than the upper limit value of the optimal temperature interval, controlling a cooling system in a battery thermal management system to be started;

if the current temperature is in the optimal temperature interval, judging whether the current electric quantity of the power battery is in the electric quantity interval without cooling;

If the current electric quantity of the power battery is smaller than the lower limit value of the electric quantity interval without cooling, a cooling system in a battery thermal management system is controlled to be started;

If the current electric quantity of the power battery is in the electric quantity interval without cooling, judging whether the current temperature of the power battery is in the temperature interval without cooling;

if the current temperature is greater than the upper limit value of the temperature interval without cooling, controlling a cooling system in a battery thermal management system to be started;

And if the current temperature is in the temperature interval without cooling, controlling a cooling system in the battery thermal management system to be closed.

7. The method of thermal management of direct current charging of a power cell of claim 1, further comprising:

and if the power battery is charged and stopped or the power battery is charged to the target electric quantity, controlling an auxiliary heating system and a cooling system in the battery thermal management system to be closed.

8. A thermal management device for direct current charging of a power battery, the device comprising:

The first calculation module is used for calculating the optimal temperature interval of the power battery in each electric quantity state according to the charging power table of the power battery and the charging capacity of the charging pile;

The second calculation module is used for calculating a cooling-free electric quantity interval and a cooling-free temperature interval of the power battery from the preset electric quantity to the target electric quantity according to the optimal temperature interval of the power battery in the initial electric quantity and the battery parameter of the power battery;

And the control module is used for judging the current electric quantity and the current temperature of the power battery according to the optimal temperature interval corresponding to the current electric quantity state of the power battery, the electric quantity interval without cooling and the temperature interval without cooling of the power battery so as to control the auxiliary heating system in the battery thermal management system to be started/stopped or the cooling system to be started/stopped.

9. An electronic device, comprising:

A controller;

A memory for storing one or more programs that, when executed by the controller, cause the controller to implement the thermal management method of direct current charging of a power battery of any of claims 1-7.

10. A computer readable storage medium, wherein at least one executable instruction is stored in the storage medium, which when run on a power battery direct current charged thermal management device/electronic device, causes the power battery direct current charged thermal management device/electronic device to perform the operations of the power battery direct current charged thermal management method of any one of claims 1 to 7.