CN118003977A - Thermal management method, device, equipment and storage medium for alternating-current charging of power battery - Google Patents
Thermal management method, device, equipment and storage medium for alternating-current charging of power battery Download PDFInfo
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Abstract
The application discloses a thermal management method and device for alternating-current charging of a power battery, electronic equipment and a storage medium, wherein the method comprises the following steps: calculating the original charging time of the power battery from the current electric quantity to the target electric quantity according to the charging rate table of the power battery and the charging capacity of the charging pile; calculating an optimal temperature interval of the power battery in a preset electric quantity state according to a charging rate meter of the power battery and the charging capacity of the charging pile; comparing the original charging time with the target charging time of the user, and if the original charging time is smaller than or equal to the target charging time, closing the battery thermal management system; if the actual temperature of the power battery in the preset electric quantity state is greater than the target charging time, judging whether the actual temperature of the power battery in the preset electric quantity state is in an optimal temperature interval or not so as to control the battery thermal management system to be started or stopped. The application can solve the problem of increasing single charging energy consumption when the vehicle is charged in an alternating current charging scene, thereby reducing single charging energy consumption and charging cost of the vehicle under the condition of meeting the charging requirement of a user.
Description
Technical Field
The application relates to the technical field of heat management of batteries of new energy automobiles, in particular to a heat management method and device for alternating-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, and in an alternating-current low-temperature charging scene, when the temperature of the power battery is lower, the current which can be received by the power battery is lower, and the charging rate is correspondingly reduced. In the conventional heating strategy, a threshold method is generally adopted for control, and the on/off of a battery thermal management system is controlled according to the actual temperature of the power battery, so that the power battery is assisted to be heated by the battery thermal management system, and the temperature of the power battery is maintained in a proper temperature interval, so that the charging rate of the power battery is improved.
However, the conventional ac low-temperature charging thermal management strategy has the problem that the power of the charging pile is low, so that the temperature corresponding to the actual maximum charging current is low, the charging time cannot be shortened even if auxiliary heating is started, and the single charging energy consumption of the power battery is increased; or because the target charging time of the power battery is longer for the user, for example, the user installs a household charging pile, and the power battery is slowly charged by adopting small current at the moment under the condition of a night charging scene, and the charging requirement of the user can be met under the condition that the auxiliary heating of the power battery is not required to be started. If the auxiliary heating of the power battery is started according to the traditional strategy, the single-charging energy consumption of the power battery can be increased.
Disclosure of Invention
In view of the above, the present application provides a thermal management method, apparatus, electronic device and computer readable storage medium for ac charging of a power battery, which are used for solving the problem of increasing the energy consumption of single charging when a vehicle is charged in an ac charging scenario, so as to reduce the energy consumption and the charging cost of single charging of the vehicle under the condition of meeting the charging requirement of a user.
According to an aspect of an embodiment of the present application, there is provided a thermal management method of power battery ac charging, the method including:
Calculating the original charging time of the power battery from the current electric quantity to the target electric quantity according to a charging rate table of the power battery and the charging capacity of the charging pile;
Calculating an optimal temperature interval of the power battery in a preset electric quantity state according to a charging rate meter of the power battery and the charging capacity of a charging pile;
Comparing the original charging time with a user target charging time, and if the original charging time is smaller than or equal to the user target charging time, closing the battery thermal management system;
If the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
In an optional manner, the calculating the original charging time for the power battery to charge to the target electric quantity according to the charging rate table of the power battery and the charging capability of the charging pile further includes:
acquiring the current electric quantity and the current temperature of the power battery, and looking up a charging rate table to acquire the charging current of the power battery in the current state;
comparing the charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the current state;
and calculating the original charging time of the power battery from the current electric quantity to a target electric quantity based on the actual charging current.
In an optional manner, the power battery is charged from the current electric quantity to the target electric quantity, wherein the power battery comprises a plurality of charging stages, and the electric quantity after the current charging stage is charged is equal to the initial electric quantity of the next charging stage;
the calculating, based on the actual charging current, an original charging time for the power battery from the present electric quantity to a target electric quantity, further includes:
acquiring initial electric quantity and corresponding temperature of each charging stage of the power battery, and looking up a charging power meter to acquire charging current corresponding to the initial electric quantity of each charging stage of the power battery;
Comparing the charging current corresponding to the initial electric quantity of each charging stage of the power battery with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the initial electric quantity state of each charging stage;
calculating the required charging time from the initial electric quantity of the current charging stage to the initial electric quantity of the next charging stage of the power battery based on the actual charging current;
and summing and calculating the charging time required by each charging stage to obtain the original charging time of the power battery from the current electric quantity to the target electric quantity.
In an alternative, the method further comprises:
Carrying out iterative correction on the required charging time from the initial electric quantity of each charging stage to the initial electric quantity of the next charging stage to obtain a required charging time correction result;
And summing and calculating the required charging time correction results of each charging stage to obtain an original charging time correction result of the power battery from the current electric quantity to the target electric quantity.
In an optional manner, the calculating the optimal temperature interval of the power battery in the preset electric quantity state according to the charging rate 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 when the power battery is in the preset electric quantity;
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 preset electric quantity;
And looking up the corresponding current of the charging rate meter in the preset electric quantity of the power battery, and obtaining a temperature interval when the corresponding current of the preset electric quantity of the power battery 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 preset electric quantity state.
In an alternative, the method further comprises:
Acquiring an ambient temperature, battery parameters of the power battery and a current temperature; the battery parameters of the power battery comprise actual charging current, internal resistance, specific heat capacity, mass, heat exchange coefficient and heat exchange area;
calculating the temperature rise of the power battery according to the battery parameters, the current temperature and the environmental temperature of the power battery;
and summing and calculating the current temperature and the temperature rise of the power battery to obtain the actual temperature of the power battery when the current electric quantity is charged to the preset electric quantity.
In an optional manner, if the original charging time is greater than the user target charging time, determining whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range, so as to control the battery thermal management system to be turned on/off, further includes:
If the actual temperature of the power battery is in the optimal temperature interval of the corresponding electric quantity, closing the battery thermal management system;
if the actual temperature of the power battery is smaller than the lower limit value of the optimal temperature interval, starting an auxiliary heating system of the battery thermal management system;
And if the actual temperature of the power battery is greater than the upper limit value of the optimal temperature interval, closing an auxiliary heating system of the battery thermal management system, and starting a cooling system of the battery thermal management system.
According to another aspect of an embodiment of the present application, there is provided a thermal management device for ac charging of a power battery, the device including:
The first calculation module is used for calculating the original charging time of the power battery from the current electric quantity to the target electric quantity 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 the optimal temperature interval of the power battery in a preset electric quantity state according to the charging power table of the power battery and the charging capacity of the charging pile;
The control module is used for comparing the original charging time with the user target charging time, and closing the battery thermal management system if the original charging time is smaller than or equal to the user target charging time; if the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
According to another aspect of an embodiment of the present application, there is provided an electronic apparatus including:
A controller;
and a memory for storing one or more programs that, when executed by the controller, cause the controller to implement the thermal management method of power battery alternating current charging described above.
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 ac charging thermal management device/electronic device, causes the power battery ac charging thermal management device/electronic device to perform the operations of the power battery ac charging thermal management method as described above.
According to the thermal management method for alternating-current charging of the power battery, when a user carries out alternating-current charging on a vehicle through an alternating-current charging pile, the vehicle can acquire the charging capability of the charging pile, so that the original charging time of the power battery of the vehicle from the current electric quantity to the target electric quantity is calculated based on the charging capability of the charging pile and the charging rate meter of the power battery of the vehicle, and the optimal temperature interval in the preset electric quantity state is calculated based on the charging capability of the charging pile and the charging rate meter of the power battery of the vehicle; and comparing the original charging time of the power battery from the current electric quantity to the target electric quantity with the target charging time of the user, and further judging whether the actual temperature of the power battery when the power battery is charged to the preset electric quantity is in an optimal temperature interval of the corresponding electric quantity, thereby determining whether the battery thermal management system of the vehicle is started or closed in the charging process. The relationship between the original charging time and the user target charging time is judged by combining the charging capacity of the charging pile and the power battery charging multiplying factor table, and when the original charging time is judged to be larger than the user target charging time, whether the actual temperature of the power battery in the preset electric quantity is in the optimal temperature interval is further judged by combining the charging capacity of the charging pile and the power battery charging multiplying factor table, so that the power battery thermal management system is adaptively controlled to be started or closed, the problem that the single charging energy consumption of a user is increased when the vehicle is charged in an alternating current charging scene is solved, and the energy consumption and the charging cost of the single charging of the vehicle are reduced under the condition that the charging requirement of the user is met.
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 an embodiment of a thermal management method for AC charging of a power battery according to the present application;
FIG. 2 shows a schematic diagram of an embodiment of step 300 of FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of step 100 of FIG. 1;
FIG. 4 is a schematic diagram illustrating an embodiment of step 200 in FIG. 1;
FIG. 5 is a schematic diagram illustrating the construction of an embodiment of a thermal management device for AC charging of a power battery according to the present application;
Fig. 6 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, and when the power battery is charged at different temperatures, a charging rate table corresponding to the battery State of Charge (SOC) and the temperature value of the power battery needs to be queried to obtain the charging current which the power battery is allowed to accept currently. Under the general circumstances, the charging current that fills electric pile output can respond the charging current of power battery demand, but because there are various electric pile products in the market, especially still there are more early electric piles in the present market, its charge ability is weaker, and the output current that provides is lower, can't reach the power battery demand.
In an alternating-current low-temperature charging scene of the vehicle, when the temperature of the power battery is low, the current which can be received by the power battery is low, and the charging speed is correspondingly reduced. The traditional heating strategy is generally controlled by a threshold method, and the on/off of the battery thermal management system is controlled according to the actual temperature of the power battery, so as to assist in heating the power battery, so that the temperature of the power battery is maintained in a proper temperature range, and the charging rate of the power battery is improved.
At present, a threshold method is adopted to control a vehicle alternating-current charging thermal management strategy conventionally as follows:
(1) If the temperature T of the power battery is less than or equal to the heated temperature threshold T1, judging that the power battery enters the heating level L1, and requesting the target water temperature Tw1 of the battery thermal management system; if the temperature T of the power battery is less than or equal to the heated temperature threshold T2, determining that the power battery enters the heating level L2, and requesting the inlet water temperature Tw2 of the battery thermal management system (wherein T2 is less than T1, tw2 is more than or equal to Tw 1).
(2) If the temperature T of the power battery is more than or equal to T2+DeltaT (DeltaT: temperature hysteresis area), or the electric quantity of the power battery reaches the target electric quantity, or the charging is stopped, the heating of the power battery is judged to be stopped.
As can be seen, the conventional threshold method is adopted to control the on/off of the battery thermal management system according to the temperature of the power battery, if the power of the charging pile is smaller, the temperature corresponding to the actual maximum charging current is lower, the charging time cannot be shortened even if auxiliary heating is started, and the single charging energy consumption of the power battery is increased; or, the target charging time of the power battery is set longer by the user, for example, the user installs a household charging pile, or the power battery is slowly charged by adopting small current under the condition of a night charging scene, and the charging requirement of the user can be met without starting a battery thermal management system for heating.
In order to solve the above problems, referring to fig. 1 for details, the present application exemplarily shows a flowchart of a thermal management method for ac charging of a power battery.
The main execution body of the thermal management method for power battery alternating-current charging may be a terminal device or a server or other processing device, 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 the alternating-current charging of the power battery can also be an automobile. In some possible implementations, the thermal management method of power battery recharging may be implemented by way of a processor invoking computer readable instructions stored in a memory.
Specifically, the thermal management method of the power battery ac charging of the present embodiment includes the steps of:
step 100, calculating the original charging time of the power battery from the current electric quantity to the target electric quantity according to a charging rate table of the power battery and the charging capacity of a 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 original charging time is the charging time when the power battery of the vehicle is charged to the target electric quantity by the current electric quantity of the power battery under the condition that the battery thermal management system does not intervene in the process, and the current electric quantity of the power battery is the battery electric quantity remained by the power battery of the vehicle when a user starts to charge when being connected with a charging gun; the target electric quantity of the power battery is the electric quantity of the battery remained by the power battery of the vehicle after the user finishes charging the vehicle.
It should be noted that, in the application, the calculation of the original charging time for charging the power battery by the charging power meter of the power battery and the charging capability of the charging pile also needs to consider the real-time temperature condition of the power battery in the current electric quantity state. The battery thermal management system in the application can refer to a battery thermal management hydro-thermal system, and can also be used for other thermal management systems such as a heat pump air conditioning system, a PTC thermal management system and the like, and is not particularly limited herein according to practical situations.
It should be noted that when the power battery is charged from the current electric quantity to the target electric quantity, the temperature of the power battery is continuously changed along with time, and the temperature rise of the power battery along with the time required for charging can be calculated according to the battery parameter, the current temperature, the ambient temperature and the like of the power battery, so that a specific temperature state when the power battery is charged from the current electric quantity to the target electric quantity is obtained.
Step 200, calculating an optimal temperature interval of the power battery in the preset electric quantity state according to a charging rate table of the power battery and the charging capacity of a charging pile;
The preset electric quantity in this embodiment may be the same as the target electric quantity in the above embodiment, or may be a preset electric quantity between the current electric quantity and the target electric quantity of the above power battery, for example, the preset electric quantity is 30%, 50%, 80%, etc., which is not limited herein specifically. The original charging time for charging to the target electric quantity can be calculated based on the charging power meter of the power battery and the charging capacity of the charging pile, and the optimal temperature interval of the power battery in any preset electric quantity state can be calculated based on the charging power meter of the power battery and the charging capacity of the charging pile, so that the vehicle can adjust the thermal management strategy of alternating-current charging of the power battery in a suitable mode.
For example, if the preset electric quantity is 30%, the charging capability 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 charging rate table of the power battery when the preset electric quantity is 30%, and calculate the optimal temperature interval of the power battery when the electric quantity is 30% by combining the charging capability 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.
Step 300, comparing the original charging time with a user target charging time, and if the original charging time is less than or equal to the user target charging time, closing the battery thermal management system; if the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
In the present embodiment, since it takes a long time to charge the vehicle slowly by the ac charging stake. For example, the actual original charging time for the user to charge the vehicle may be 5 hours, 6 hours, 7 hours, etc., however, when the user installs the charging post in the home garage or the user charges the vehicle at night, the user may park the vehicle at the charging post position and directly leave home after connecting the vehicle to the charging gun for charging, and the time period for the user to leave the vehicle may be the target charging time of the user, for example, the target charging time may be 8 hours, 9 hours, etc. or even longer. At this time, the original charging time from the current electric quantity to the target electric quantity of the power battery of the vehicle is less than or equal to the target charging time, and the battery thermal management system of the vehicle does not need to be started for auxiliary heating, so that the charging requirement of a user can be met, and the single charging energy consumption and the single charging cost of the vehicle are reduced.
If the original charging time of the power battery of the vehicle from the current electric quantity to the target electric quantity is greater than the target charging time of the user, for example, the actual original charging time of the user for charging the vehicle may be 5 hours, 6 hours, 7 hours, etc., and the target charging time of the user is 3 hours, 4 hours, further reference should be made to fig. 2, and fig. 2 is a schematic flow chart showing comparison between the actual temperature and the optimal temperature interval of the power battery according to an exemplary embodiment of the present application, specifically:
Step 310: if the actual temperature of the power battery is in the optimal temperature interval of the corresponding electric quantity, closing the battery thermal management system;
the actual temperature calculation of the power battery may specifically be to obtain the environmental temperature, the current temperature, and battery parameters of the power battery such as the actual charging current, the internal resistance, the specific heat capacity, the mass, the heat exchange coefficient, the heat exchange area, etc. to calculate the temperature rise when the power battery is charged to the preset electric quantity, and sum the current temperature and the temperature rise of the power battery to obtain the actual temperature when the power battery is charged from the current electric quantity to the preset electric quantity.
For example, if the required charging time is Δt m when charging from the current power to the preset power, the following formula is adopted: delta T m＝(Im 2R+Ah(Te-Tm))△tm/Cm, calculating the temperature rise of the power battery when the current electric quantity is charged to the preset electric quantity, wherein the actual temperature of the power battery when the electric quantity is preset is as follows: t m+1＝Tm+△Tm. In this embodiment, Q m is the charging capacity of the power battery when the current electric quantity is charged to the preset electric quantity; r is the internal resistance of the power battery; c is the specific heat capacity of the battery, m is the mass of the battery, h is the heat exchange coefficient of the power battery and the environment, A is the heat exchange area of the power battery and the environment, T m is the current temperature, and T e is the environment temperature.
Step 320: if the actual temperature of the power battery is smaller than the lower limit value of the optimal temperature interval, starting an auxiliary heating system of the battery thermal management system;
step 330: and if the actual temperature of the power battery is greater than the upper limit value of the optimal temperature interval, closing an auxiliary heating system of the battery thermal management system, and starting a cooling system of the battery thermal management system.
The comparison between the actual temperature of the power battery and the optimal temperature interval is established when the original charging time of the vehicle is longer than the target charging time, and then the actual temperature of the power battery of the vehicle in the whole charging process needs to be further considered to determine whether the battery thermal management system of the vehicle is started at each moment in the whole charging process. Specifically, if it is determined that the original charging time of the vehicle is greater than the target charging time of the user, it is required to determine whether the actual temperature corresponding to the electric quantity of the power battery of the vehicle is in the optimal temperature interval of the corresponding electric quantity of the power battery in the whole charging process. At this time, if the actual temperature of the power battery is in the optimal temperature interval, the power battery can achieve better charging efficiency without starting a battery thermal management system of the vehicle to perform auxiliary heating, so as to control the battery thermal management system of the vehicle to be closed, thereby reducing energy consumption; if the actual temperature of the power battery is greater than the upper limit value of the optimal temperature interval, the power battery can achieve better charging efficiency without starting a battery thermal management system of the vehicle, the auxiliary heating system of the battery thermal management system of the vehicle can be controlled to be closed, and meanwhile, a cooling system of the battery thermal management system is started, so that the temperature of the power battery is reduced to the optimal temperature interval, and the reduction of energy consumption is achieved under the condition of controlling the safety of the power battery; if the actual temperature of the power battery is smaller than the lower limit value of the optimal temperature interval, the battery thermal management system of the vehicle is required to be controlled to be started for auxiliary heating, so that the temperature of the power battery is in the optimal temperature interval, the charging efficiency of the power battery is improved, the charging time is shortened, and the charging requirement of a user is met.
According to the embodiment of the application, the relation between the original charging time and the user target charging time is judged by combining the charging capacity of the charging pile and the charging rate table of the power battery, and when the original charging time is judged to be larger than the user target charging time, whether the actual temperature of the power battery in the preset electric quantity is in the optimal temperature range is judged by further combining the charging capacity of the charging pile and the charging rate table of the power battery, so that the opening or closing of the vehicle thermal management system is adaptively controlled, the problem that the single charging energy consumption is increased when a user charges the vehicle in an alternating current charging scene is solved, and the energy consumption and the charging cost of the single charging of the vehicle are reduced under the condition that the charging requirement of the user is met.
Referring now to fig. 3, fig. 3 is a flow chart illustrating step 100 of fig. 1 according to an exemplary embodiment of the present application. The thermal management method at least comprises steps 110 to 130, specifically:
Step 110: acquiring the current electric quantity and the current temperature of the power battery, and looking up a charging rate table to acquire the charging current of the power battery in the current state;
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 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; therefore, the vehicle can look up the charging rate table at the moment based on the current electric quantity and the current temperature of the power battery of the vehicle so as to obtain the charging current corresponding to the power battery in the corresponding moment state.
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.
Step 120: comparing the charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the current 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 calculating the original charging time of the power battery from the current electric quantity to a target electric quantity based on the actual charging current.
In this embodiment, after the vehicle obtains the maximum charging current of the charging pile, the charging current of the power battery in the corresponding time state is compared with the maximum charging current of the charging pile, and a small value is taken after comparison as the actual charging current of the power battery in the current corresponding time state, so that the actual charging current at this time is adopted to calculate the original charging time of the power battery from the current electric quantity to the target electric quantity.
For example, if the current remaining capacity of the power battery is SOC m, the current temperature is T m, the charging rate table at this time is checked to obtain the charging current I0 m in the current corresponding time state, the charging capacity I0 m and the maximum charging current I Pile of the charging pile take small values, so as to obtain the actual charging current I m＝MIN(I0m,I Pile in the current corresponding time state), at this time, the original charging time required for charging the power battery of the vehicle from the current capacity SOC m to the target capacity SOC m+1 by the current curve I m is Δt m＝Qm/Im,Qm, and the charging capacity of the power battery is charged from the current capacity to the target capacity.
Further, as the remaining power of the power battery rises along with the time in the charging process, at each time node, the corresponding voltage, current and temperature are different, so that the original charging time of the power battery is more accurate. Specifically, after the power battery is charged from the current electric quantity to the target electric quantity and divided into a plurality of charging phases, the calculation of the original charging time of the power battery is specifically:
Acquiring initial electric quantity of each charging stage of the power battery and the temperature corresponding to the charging stage, and acquiring charging current corresponding to the initial electric quantity of each charging stage of the power battery based on the table lookup charging rate table; then comparing the charging current corresponding to the initial electric quantity of each charging stage of the power battery with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the initial electric quantity state of each charging stage; then calculating the required charging time of the power battery from the initial electric quantity of the current charging stage to the initial electric quantity of the next charging stage based on the actual charging current; and finally, summing and calculating the charging time required by each charging stage to obtain the original charging time of the power battery from the current electric quantity to the target electric quantity.
For example, assuming that the current electric quantity of the power battery in the initial charging stage is SOC m, the target electric quantity after the whole charging process is completed is SOC n, and the original charging time from the current electric quantity of the power battery in the initial charging stage to the target electric quantity is Δt 0, the charging time required in each charging stage is summed and calculated to obtain the original charging time Δt 0＝△tm+△tm+1+…△tn-1.
It should be noted that, in this embodiment, the calculation of the required charging time for the power battery to be charged from the initial charge amount of the current charging stage to the initial charge amount of the next charging stage based on the actual charging current may be equal to the "original charging time for the power battery to be charged from the current charge amount to the target charge amount" in the embodiment of fig. 3, or the whole charging process in this embodiment may be equal to the "original charging time for the power battery to be charged from the current charge amount to the target charge amount" in the embodiment of fig. 3. That is, the calculation of the original charging time in the embodiment of fig. 3 can be regarded as the calculation of the required charging time for one charging stage in the embodiment, or the calculation of the original charging time in the embodiment of fig. 3 can be regarded as the calculation of the original charging time for the entire charging process in the embodiment.
In another exemplary embodiment, since the power battery can be charged from the current charge level to the target charge level in a plurality of charging phases, the power battery state can be independently determined in each charging phase to determine whether to turn on the battery thermal management system of the power battery until the power battery is charged to the target charge level or the power battery is charged to the target charge level. By independently judging each charging stage in the embodiment, the vehicle can adaptively start the battery thermal management system according to the state of the power battery in each charging stage, so that the real-time monitoring of the charging process of the power battery is realized, and the full charging period of the power battery is in a proper charging environment.
Further, in order to improve the accuracy of the original charging time calculation, the embodiment further includes a correction step of the charging time required for each charging stage, specifically:
And carrying out iterative correction on the required charging time from the initial electric quantity of each charging stage to the initial electric quantity of the next charging stage, and taking the latest calculated required charging time of each charging stage as the required charging time from the initial electric quantity of the charging stage to the initial electric quantity of the next charging stage so as to obtain a required charging time correction result, thereby improving the accuracy of the required charging time of each charging stage. And summing and calculating the required charging time correction results of each charging stage to obtain an original charging time correction result of the power battery from the current electric quantity to the target electric quantity, thereby improving the accuracy of the original charging time of the whole charging process of the power battery.
Referring now to fig. 4, fig. 4 is a flow chart illustrating step 200 of fig. 1 according to an exemplary embodiment of the present application. The thermal management method at least comprises steps 210 to 230, specifically:
Step 210: looking up the charging rate table to obtain the maximum allowable charging current of the power battery when the power battery is in the preset electric quantity;
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 is preset in 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 220: 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 preset electric quantity;
Step 230: and looking up the corresponding current of the charging rate meter in the preset electric quantity of the power battery, and obtaining a temperature interval when the corresponding current of the preset electric quantity of the power battery 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 preset electric quantity state.
The actual maximum charging current is a minimum value in the maximum allowable charging current and the maximum charging current of the charging pile, so that the corresponding current of the charging power factor table in the preset electric quantity of the power battery is larger than or equal to the actual maximum charging current, and the temperature interval of the power battery in the preset 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 preset 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 preset 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: the temperature interval (T1 x, T2 x) of I Theory of ≥Imaxx is used as the optimal temperature interval (T1 x, T2 x) of the power battery in the state of corresponding to the preset electric quantity SOC x.
For example, assuming that the actual maximum charging current Imax x of the power battery is 28A when the preset electric quantity is 50%, and the corresponding theoretical current I Theory of in the table of the preset electric quantity state lookup charging rate is 30A, 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, a temperature interval corresponding to the theoretical current greater than or equal to the actual maximum charging current in a state where the preset state of charge of the power battery is 50% is (30, 42) as an optimal temperature interval for charging in a state where the preset 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.
Fig. 5 shows a schematic structural view of an embodiment of a thermal management device for power cell ac charging of the present application. Referring to fig. 5, the thermal management device 400 for ac charging of a power battery includes: a first calculation module 410, a second calculation module 420, and a control module 430;
A first calculation module 410, configured to calculate an original charging time for the power battery from a current electric quantity to a target electric quantity according to a charging rate table of the power battery and a charging capability of a charging pile;
the second calculating module 420 is configured to calculate an optimal temperature interval of the power battery in the preset electric quantity state according to a charging rate table of the power battery and a charging capacity of a charging pile;
The control module 430 is configured to compare the original charging time with a user target charging time, and if the original charging time is less than or equal to the user target charging time, close the battery thermal management system; if the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
It should be noted that, the thermal management device 400 for power battery ac charging provided in the above embodiment is the same concept as the thermal management method for power battery ac charging provided in the above 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. 6, fig. 6 is a schematic structural diagram of an embodiment of an electronic device according to the present application, which illustrates 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. 6, the electronic device includes: a controller; and a memory for storing one or more programs that, when executed by the controller, perform the method of thermal management of power battery ac charging described above.
With continued reference to fig. 6, 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 method of thermal management of power battery ac charging 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 power battery ac charging as described below, the method comprising:
Calculating the original charging time of the power battery from the current electric quantity to the target electric quantity according to a charging rate table of the power battery and the charging capacity of the charging pile;
Calculating an optimal temperature interval of the power battery in the preset electric quantity state according to a charging rate meter of the power battery and the charging capacity of a charging pile;
Comparing the original charging time with a user target charging time, and if the original charging time is smaller than or equal to the user target charging time, closing the battery thermal management system;
If the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
According to the thermal management method for alternating-current charging of the power battery, when a user carries out alternating-current charging on a vehicle through an alternating-current charging pile, the vehicle can acquire the charging capability of the charging pile, so that the original charging time of the power battery of the vehicle from the current electric quantity to the target electric quantity is calculated based on the charging capability of the charging pile and the charging rate meter of the power battery of the vehicle, and the optimal temperature interval in the preset electric quantity state is calculated based on the charging capability of the charging pile and the charging rate meter of the power battery of the vehicle; and comparing the original charging time of the power battery from the current electric quantity to the target electric quantity with the target charging time of the user, and further judging whether the actual temperature of the power battery when the power battery is charged to the preset electric quantity is in an optimal temperature interval of the corresponding electric quantity, thereby determining whether the battery thermal management system of the vehicle is started or closed in the charging process. The relationship between the original charging time and the user target charging time is judged by combining the charging capacity of the charging pile and the power battery charging multiplying factor table, so that when the original charging time is larger than the user target charging time, whether the actual temperature of the power battery in the preset electric quantity is in an optimal temperature interval is judged by further combining the charging capacity of the charging pile and the power battery charging multiplying factor table, the power battery thermal management system is controlled to be opened or closed adaptively, the problem that the single charging energy consumption of a user is increased when the vehicle is charged in an alternating current charging scene is solved, and the energy consumption and the charging cost of the single charging of the vehicle are reduced under the condition that the charging requirement of the user is met.
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 power cell ac charging, the method comprising:
Calculating the original charging time of the power battery from the current electric quantity to the target electric quantity according to a charging rate table of the power battery and the charging capacity of the charging pile;
calculating an optimal temperature interval of the power battery in a preset electric quantity state according to a charging rate meter of the power battery and the charging capacity of the charging pile;
Comparing the original charging time with a user target charging time, and if the original charging time is smaller than or equal to the user target charging time, closing the battery thermal management system;
And if the original charging time is longer than the user target charging time, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or stopped.
2. The method of claim 1, wherein calculating an initial charge time for charging the power battery to a target charge amount according to a charge rate table of the power battery and a charging capacity of a charging post, further comprises:
acquiring the current electric quantity and the current temperature of the power battery, and looking up a charging rate table to acquire the charging current of the power battery in the current state;
comparing the charging current with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the current state;
and calculating the original charging time of the power battery from the current electric quantity to a target electric quantity based on the actual charging current.
3. The method of claim 2, wherein charging the power battery from the current charge to a target charge comprises a plurality of charging phases, wherein the charge after the current charging phase is completed is equal to the initial charge of the next charging phase;
the calculating, based on the actual charging current, an original charging time for the power battery from the present electric quantity to a target electric quantity, further includes:
acquiring initial electric quantity and corresponding temperature of each charging stage of the power battery, and looking up a charging power meter to acquire charging current corresponding to the initial electric quantity of each charging stage of the power battery;
Comparing the charging current corresponding to the initial electric quantity of each charging stage of the power battery with the maximum charging current of the charging pile, and taking a small value to be used as the actual charging current of the power battery in the initial electric quantity state of each charging stage;
calculating the required charging time from the initial electric quantity of the current charging stage to the initial electric quantity of the next charging stage of the power battery based on the actual charging current;
and summing and calculating the charging time required by each charging stage to obtain the original charging time of the power battery from the current electric quantity to the target electric quantity.
4. A method of thermal management of power cell ac charging according to claim 3, further comprising:
Carrying out iterative correction on the required charging time from the initial electric quantity of each charging stage to the initial electric quantity of the next charging stage to obtain a required charging time correction result;
And summing and calculating the required charging time correction results of each charging stage to obtain an original charging time correction result of the power battery from the current electric quantity to the target electric quantity.
5. The method according to claim 1, wherein calculating an optimal temperature interval of the power battery in the preset state of charge according to a charging rate table of the power battery and a charging capability of the charging post, further comprises:
Looking up the charging rate table to obtain the maximum allowable charging current of the power battery when the power battery is in the preset electric quantity;
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 preset electric quantity;
And looking up the corresponding current of the charging rate meter in the preset electric quantity of the power battery, and obtaining a temperature interval when the corresponding current of the preset electric quantity of the power battery 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 preset electric quantity state.
6. The method of thermal management of power cell ac charging of claim 1, further comprising:
Acquiring an ambient temperature, battery parameters of the power battery and a current temperature; the battery parameters of the power battery comprise actual charging current, internal resistance, specific heat capacity, mass, heat exchange coefficient and heat exchange area;
calculating the temperature rise of the power battery according to the battery parameters, the current temperature and the environmental temperature of the power battery;
and summing and calculating the current temperature and the temperature rise of the power battery to obtain the actual temperature of the power battery when the current electric quantity is charged to the preset electric quantity.
7. The method according to claim 1, wherein if the original charging time is greater than a user target charging time, determining whether an actual temperature of the power battery in the preset state of charge is within the optimal temperature range to control the battery thermal management system to be turned on/off, further comprises:
If the actual temperature of the power battery is in the optimal temperature interval of the corresponding electric quantity, closing the battery thermal management system;
if the actual temperature of the power battery is smaller than the lower limit value of the optimal temperature interval, starting an auxiliary heating system of the battery thermal management system;
And if the actual temperature of the power battery is greater than the upper limit value of the optimal temperature interval, closing an auxiliary heating system of the battery thermal management system, and starting a cooling system of the battery thermal management system.
8. A thermal management device for ac charging of a power battery, the device comprising:
The first calculation module is used for calculating the original charging time of the power battery from the current electric quantity to the target electric quantity 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 the optimal temperature interval of the power battery in a preset electric quantity state according to the charging power table of the power battery and the charging capacity of the charging pile;
The control module is used for comparing the original charging time with the user target charging time, and closing the battery thermal management system if the original charging time is smaller than or equal to the user target charging time; if the original charging time is greater than the target charging time of the user, judging whether the actual temperature of the power battery in the preset electric quantity state is in the optimal temperature range or not so as to control the battery thermal management system to be started or 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 power cell ac charging of any of claims 1-8.
10. A computer readable storage medium having stored therein at least one executable instruction that, when run on a power battery ac charged thermal management device/electronic device, causes the power battery ac charged thermal management device/electronic device to perform the operations of the power battery ac charged thermal management method of any one of claims 1 to 8.
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