CN114720876A - Method, device and medium for acquiring residual charging time of power battery - Google Patents
Method, device and medium for acquiring residual charging time of power battery Download PDFInfo
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a method for acquiring the residual charging time of a power battery, which comprises the following steps: constructing a remaining charging time lookup table of the power battery based on a simulation test, wherein the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters; when charging is started, acquiring the charging state of a power battery, wherein the charging state comprises direct current charging and alternating current charging; acquiring thermal management parameters and battery residual capacity of the power battery in the charging state; and inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to obtain the remaining charging time of the power battery. The method effectively solves the problems that the existing remaining charging time calculation mode does not consider the heat management strategy and the power limiting factor of the whole vehicle, and the calculation efficiency and the accuracy are poor.
Description
Technical Field
The invention relates to the technical field of information, in particular to a method, a device and a medium for acquiring the residual charging time of a power battery.
Background
The existing new energy electric vehicle can generally provide the residual charging time from the current moment to the full charge of the power battery for the user to refer to, and the accuracy of the residual charging time directly influences the vehicle using experience of the user. Because the charging mode of the power battery is related to the charging power, the charging power affects the actual temperature of the battery, and further affects the charging current, and the remaining charging time is correspondingly changed. In addition, when the power battery is charged in different environments, the thermal management system of the whole vehicle can cool or heat the power battery to change the charging current so as to achieve the expected charging speed, and therefore the thermal management strategy of the whole vehicle can also influence the residual charging time.
In the prior art, the remaining charging time is calculated mainly by calculating the ratio of the remaining charging amount of the power battery to the charging current. The remaining charge amount is the current electric quantity (SOC), but the charging current fluctuates greatly according to the thermal management strategy and the power limiting factor of the entire vehicle. In the prior art, the residual charging time is calculated by basically focusing on the overall estimation of the residual charging current, the thermal management strategy and the power limiting factor of the whole vehicle are not considered, and the calculation efficiency and the accuracy of the residual charging time are not good enough.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a medium for acquiring the remaining charging time of a power battery, and aims to solve the problems that the existing remaining charging time calculation mode does not consider the thermal management strategy and the power limiting factor of the whole vehicle, and the calculation efficiency and accuracy are poor.
A method for acquiring the residual charging time of a power battery comprises the following steps:
constructing a remaining charging time lookup table of the power battery based on a simulation test, wherein the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters;
when charging is started, acquiring the charging state of a power battery, wherein the charging state comprises direct current charging and alternating current charging;
acquiring thermal management parameters and battery residual capacity of the power battery in the charging state;
and inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to obtain the remaining charging time of the power battery.
Optionally, the building of the remaining charging time lookup table of the power battery based on the simulation test includes:
constructing a power battery one-dimensional simulation analysis model of the whole vehicle thermal management system, wherein the power battery one-dimensional simulation analysis model comprises a power battery heating model, a power battery cooling and heating model and a power battery temperature control strategy model;
performing a direct current/alternating current simulation test on the power battery one-dimensional simulation analysis model, and generating a remaining charging time query table of the power battery in a direct current state/alternating current state according to a simulation test result;
and integrating the remaining charging time query table into the whole vehicle for testing, and outputting the remaining charging time query table according to a test result.
Optionally, the performing a dc/ac simulation test on the one-dimensional simulation analysis model of the power battery, and generating a remaining charging time lookup table of the power battery in a dc state/ac state according to a simulation test result includes:
acquiring simulation parameters and a variation range thereof according to input parameters of a residual charging time look-up table in a direct current state/alternating current state and design parameters of the whole vehicle;
establishing simulation working conditions according to the simulation parameters and the variation range thereof, and respectively inputting simulation parameter values corresponding to the simulation working conditions into the power battery one-dimensional simulation analysis model for simulation test;
and generating a residual charging time query table in a direct current state/alternating current state according to the simulation test result.
Optionally, the integrating the remaining charging time lookup table into the entire vehicle for testing, and outputting the remaining charging time lookup table according to the test result includes:
integrating the remaining charging time query table on the whole vehicle, and testing the remaining charging time query table according to the test working condition to obtain a remaining charging time test value;
comparing the residual charging time test value with the actual charging time corresponding to the test working condition to obtain an error between the residual charging time test value and the actual charging time;
when the error is larger than or equal to a preset error threshold value, updating the simulation parameters to carry out the next simulation test;
and when the error is smaller than the preset error threshold, ending the simulation test and outputting the remaining charging time lookup table.
Optionally, the simulation parameters in the dc state include:
the residual electric quantity of the battery, the temperature information of a cooling medium of the battery and the maximum output power of the direct current charging pile.
Optionally, the simulation parameters in the alternating current state include:
the residual electric quantity of the battery, the ambient temperature information and the rated power of the vehicle-mounted charger.
An apparatus for obtaining the remaining charging time of a power battery comprises:
the system comprises a construction module, a storage module and a control module, wherein the construction module is used for constructing a remaining charging time lookup table of the power battery based on a simulation test, and the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters;
the state acquisition module is used for acquiring the charging state of the power battery when charging is started, wherein the charging state comprises direct current charging and alternating current charging;
the parameter acquisition module is used for acquiring the thermal management parameters and the battery residual capacity of the power battery in the charging state;
and the time acquisition module is used for inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to acquire the remaining charging time of the power battery.
Optionally, the building module comprises:
the system comprises a model construction unit, a heat management unit and a heat management unit, wherein the model construction unit is used for constructing a power battery one-dimensional simulation analysis model of the whole vehicle heat management system, and the power battery one-dimensional simulation analysis model comprises a power battery heating model, a power battery cooling and heating model and a power battery temperature control strategy model;
the simulation test unit is used for carrying out a direct current/alternating current simulation test on the power battery one-dimensional simulation analysis model and generating a residual charging time query table of the power battery in a direct current state/alternating current state according to a simulation test result;
and the test unit is used for integrating the remaining charging time query table into the whole vehicle for testing and outputting the remaining charging time query table according to a test result.
Optionally, the simulation test unit includes:
the parameter acquisition subunit is used for acquiring simulation parameters and a variation range thereof according to input parameters of the remaining charging time lookup table in the direct current state/alternating current state and design parameters of the whole vehicle;
the simulation test subunit is used for constructing a simulation working condition according to the simulation parameters and the variation range thereof, and respectively inputting simulation parameter values corresponding to the simulation working condition into the power battery one-dimensional simulation analysis model for simulation test;
and the table generating subunit is used for generating a residual charging time query table in the direct current state/alternating current state according to the simulation test result.
A computer-readable storage medium, which stores a computer program, which, when executed by a processor, implements the above method for acquiring remaining charging time of a power battery.
The embodiment of the invention constructs the remaining charging time query table of the power battery based on the simulation test, wherein the remaining charging time query table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters, the influence of the whole vehicle thermal management strategy and the power limit on the charging current in the charging process is fully considered, and the accuracy of the remaining charging time is higher; then when charging is started, acquiring the charging state of the power battery, wherein the charging state comprises direct current charging and alternating current charging; acquiring thermal management parameters and residual battery capacity of the power battery in the charging state; finally, inquiring a remaining charging time inquiry table in the charging state according to the thermal management parameters and the remaining battery capacity to obtain the remaining charging time of the power battery; the output of the residual charging time of the power battery is completed in a form of directly inquiring the table, the method is easy to implement on the whole vehicle, the prediction efficiency of the residual charging time is effectively improved, and the charging experience of a user is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a flowchart of a method for acquiring remaining charging time of a power battery according to an embodiment of the present invention;
fig. 2 is a flowchart of step S101 in the method for acquiring remaining charging time of a power battery according to the embodiment of the present invention;
fig. 3 is a flowchart of step S202 in the method for acquiring remaining charging time of a power battery according to the embodiment of the present invention;
fig. 4 is a flowchart of step S203 in the method for acquiring the remaining charging time of the power battery according to the embodiment of the present invention;
fig. 5 is a schematic block diagram of an apparatus for obtaining remaining charging time of a power battery according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for acquiring the remaining charging time of the power battery provided by the embodiment is described in detail below. In order to improve the charging experience of a new energy automobile in the using process and accurately predict the time consumed by the current electric quantity to the full charge quantity, the embodiment of the invention constructs a residual charging time query table of the power battery based on a simulation test, the residual charging time query table comprises the corresponding relation between the battery residual capacity and the residual charging time of the power battery under different thermal management parameters, the residual charging time of the power battery is predicted by utilizing the residual charging time query table, the obtained residual charging time fully considers the influence of the whole automobile thermal management strategy and the power limitation on the charging current in the charging process, the accuracy is higher, the prediction efficiency of the residual charging time is effectively improved, and the charging experience of a user is improved.
As shown in fig. 1, the method for acquiring the remaining charging time of the power battery comprises the following steps:
in step S101, a remaining charging time lookup table of the power battery is constructed based on a simulation test, where the remaining charging time lookup table includes a corresponding relationship between the remaining battery capacity and the remaining charging time of the power battery under different thermal management parameters.
Here, since the affected thermal management parameters under the dc charging and the ac charging are different, the remaining charging time lookup table is divided into a remaining charging time lookup table under the dc state and a remaining charging time lookup table under the ac state according to the charging state in this embodiment. The input parameters of the remaining charging time lookup table in the direct-current state include, but are not limited to, battery remaining capacity, battery temperature information, battery cooling medium temperature information and maximum output power of the direct-current charging pile, wherein the battery temperature information, the battery cooling medium temperature information and the maximum output power of the direct-current charging pile are thermal management parameters in the direct-current state; the input parameters of the remaining charging time lookup table in the alternating current state include, but are not limited to, the remaining capacity of the battery, ambient temperature information, and the rated power of the vehicle-mounted charger, wherein the ambient temperature information and the rated power of the vehicle-mounted charger are thermal management parameters in the alternating current state. The battery residual capacity refers to the current residual capacity of the power battery, and is mainly the battery residual capacity (State of charge, abbreviated as SOC) displayed by an instrument; the battery temperature information is the average temperature of the power battery; the battery cooling medium temperature information refers to the inlet temperature of the battery cooling medium, for example, the liquid cooling power battery is at the water inlet temperature, and the air cooling power battery is at the air inlet temperature; the environmental temperature information refers to the temperature of the environment where the power battery is located.
Because the input parameters can change within a certain range, in order to improve the universality of the remaining charging time lookup table, the input parameters within the change range need to be considered, the simulation test in the embodiment adopts a virtual test based on one-dimensional simulation, the test of the change relationship between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters is completed, and the charging remaining time lookup table conforming to the practical application scene is obtained.
Alternatively, as shown in fig. 2, the step S101 of building a remaining charging time lookup table of the power battery based on the simulation test includes:
in step S201, a power battery one-dimensional simulation analysis model of the entire vehicle thermal management system is constructed, where the power battery one-dimensional simulation analysis model includes a power battery heating model, a power battery cooling and heating model, and a power battery temperature control strategy model.
In the embodiment, the power battery heating model is used for describing the heating value change of the power battery caused by the internal resistance change under different battery temperature information and battery residual capacity. The power battery cooling and heating model is used for describing the heat exchange relationship between the power battery and the environment. The power battery temperature control strategy model is used for describing the relationship between the battery temperature and the heating or cooling operation of the power battery, and comprises but is not limited to an energy management strategy and a temperature control strategy. The energy management strategy comprises a power supply strategy of a heater during heating and a power supply strategy of an air conditioner during cooling in the direct-current charging process, charging current or power supply strategies in different charging stages, and a control strategy of actual output charging power of a vehicle-mounted charger in the alternating-current charging process. The temperature control strategy comprises a heating strategy of the power battery at low temperature and a cooling strategy of the power battery at high temperature.
The constructed one-dimensional simulation analysis model of the power battery is a power battery simulation system of a specific vehicle type.
In step S202, a dc/ac simulation test is performed on the power battery one-dimensional simulation analysis model, and a remaining charging time lookup table of the power battery in a dc state/ac state is generated according to a simulation test result.
After the one-dimensional simulation analysis model of the power battery is established, simulation is carried out on the charging process under different power limits. Because the maximum output power of different direct current charging piles and the rated power of the vehicle-mounted charger are not always the same, simulation tests need to be carried out under different power limiting conditions.
For direct current charging, the power limit refers to the maximum output power of the direct current charging pile in the thermal management parameters. The method comprises the steps of determining the variation range of simulation parameters by obtaining the simulation parameters corresponding to a direct current simulation test, then determining simulation working conditions and values of the simulation parameters corresponding to the simulation working conditions, and simulating the charging process under different maximum output powers of direct current charging piles. For alternating current charging, the power limit refers to the rated power of a vehicle-mounted charger in the thermal management parameters. The method comprises the steps of determining the variation range of simulation parameters by obtaining the simulation parameters corresponding to the alternating current simulation test, then determining the simulation working conditions and the values of the simulation parameters corresponding to the simulation working conditions, and simulating the charging process under the rated power of different vehicle-mounted chargers. And finally, generating a residual charging time query table of the power battery under the direct current charging and the alternating current charging respectively according to the simulation test result.
For ease of understanding, a description of the simulation test procedure is given below. As shown in fig. 3, the step S202 of performing a dc/ac simulation test on the one-dimensional simulation analysis model of the power battery, and generating a remaining charging time lookup table of the power battery in a dc state/ac state according to a simulation test result includes:
in step S301, simulation parameters and a variation range thereof are obtained according to input parameters of the remaining charging time lookup table in the dc/ac state and vehicle design parameters.
In the embodiment, the input parameters of the remaining charging time lookup table in the direct current state/alternating current state are used as simulation parameters, and the variation range of the simulation parameters is determined according to the design parameters of the whole vehicle. As described above, the input parameters of the remaining charging time lookup table in the dc state include, but are not limited to, the remaining battery capacity, the battery temperature information, the battery cooling medium temperature information, and the maximum output power of the dc charging post. The input parameters of the remaining charging time lookup table in the alternating current state include, but are not limited to, the remaining capacity of the battery, the ambient temperature information and the rated power of the vehicle-mounted charger. When the variation range of the simulation parameters is determined, the battery temperature information and the environment temperature information cover the use temperature of the whole vehicle design, such as-20-40 ℃; the current electric quantity information, namely the residual electric quantity of the power battery, is required to cover the range of 0-100% and the simulation working condition of the charging terminal is required to be refined; the capacity of the charging equipment is considered under the condition of power limitation of the charging equipment, the capacity needs to be reflected under simulation analysis, and the charging process of the change of the inlet temperature of the battery cooling medium brought by different power limitations needs to be simulated according to the design of an actual finished automobile system.
In step S302, a simulation condition is constructed according to the simulation parameters and the variation range thereof, and the values of the simulation parameters corresponding to the simulation condition are respectively input to the one-dimensional simulation analysis model of the power battery for a simulation test.
And combining the different simulation parameters and values thereof to obtain a specific simulation working condition, inputting the simulation parameter values corresponding to the simulation working condition into the one-dimensional simulation analysis model of the power battery, and performing a simulation test to obtain the simulation time corresponding to the simulation working condition. And traversing a plurality of simulation working conditions to complete a plurality of groups of simulation tests to obtain a plurality of simulation times.
For the direct current state, combining different values in the residual capacity of the battery, the temperature information of a cooling medium of the battery and the maximum output power of the direct current charging pile to obtain a corresponding simulation working condition; and for the alternating current state, combining different values of the residual capacity of the battery, the ambient temperature information and the rated power of the vehicle-mounted charger to obtain a corresponding simulation working condition.
In step S303, a remaining charging time lookup table in the dc state/ac state is generated according to the simulation test result.
For direct current charging, through the simulation test of simulation conditions based on different simulation parameter value combinations in step S203, the direct current charging simulation result of the power battery under the limitation of different battery residual capacities, different battery temperature information, different battery cooling medium temperature information and different maximum output powers of the direct current charging pile can be obtained. The simulation result comprises simulation parameters of direct current charging and variation data of simulation time. The embodiment generates the remaining charging time lookup table in the direct current state according to the simulation result.
Similarly, for ac charging, the ac charging simulation result of the power battery under the limitation of different battery residual capacities, environmental temperature information and rated power of the vehicle-mounted charger can be obtained through the simulation test of the simulation condition based on different simulation parameter value combinations in step S203. The simulation result comprises simulation parameters of alternating current charging and variation data of simulation time. The embodiment generates the remaining charging time lookup table in the alternating current state according to the simulation result.
In practical application, for direct current charging, because the influence of water temperature can be ignored under the condition that the heating power and the cooling power are relatively fixed, and meanwhile, the charging power of the power battery is relatively small, and the influence of the maximum output power of the direct current charging pile can not be considered, the dimension of the remaining charging time query table in the direct current state can be reduced into a two-dimensional query table only comprising the remaining capacity and the temperature information of the battery. For alternating current charging, because the power of alternating current charging equipment equipped for the automobile is fixed, if no other limitation exists, the charging time can be judged according to the charging current and the power, and the dimension of the remaining charging time lookup table in the alternating current state can be reduced into a two-dimensional lookup table comprising environment temperature information and the remaining capacity of the battery.
It can be seen that, because the power battery one-dimensional simulation analysis model includes a power battery heating model, a power battery cooling heating model and a power battery temperature control strategy model, in this embodiment, through the steps S301 to S303, a dc/ac simulation test is performed on the power battery one-dimensional simulation analysis model, and the simulation parameters include various thermal management parameters, so that the remaining charging time lookup table of the power battery in a dc state/ac state, which is generated according to the simulation test result, fully considers the influence of the whole vehicle thermal management control strategy and power limitation, greatly saves actually required test quantity and resources, and is efficient and easy to implement.
In step S203, the remaining charging time lookup table is integrated into the entire vehicle for testing, and the remaining charging time lookup table is output according to the test result.
After a residual charging time query table is obtained through a simulation test, the residual charging time query table is integrated on the whole vehicle, and a test working condition is selected for test calibration. If the test result meets the error requirement, the remaining charging time query table meets the requirement and is used as a use standard in the process of calculating the remaining time; otherwise, carrying out simulation adjustment on the remaining charging time lookup table again.
Optionally, as shown in fig. 4, the step S203 of integrating the remaining charging time lookup table into the entire vehicle for testing, and outputting the remaining charging time lookup table according to the test result includes:
in step S401, the remaining charging time lookup table is integrated into the entire vehicle, and the remaining charging time lookup table is tested according to the test condition to obtain a remaining charging time test value.
The test working condition comprises a direct current test working condition and an alternating current test working condition. For the remaining charging time lookup table in the dc state, the remaining charging time lookup table is queried according to the thermal management parameter value and the battery remaining capacity corresponding to the dc test condition to obtain a corresponding remaining charging time test value. Similarly, for the remaining charging time lookup table in the ac state, the remaining charging time lookup table is queried according to the thermal management parameter value and the battery remaining capacity corresponding to the ac test condition in this embodiment, so as to obtain a corresponding remaining charging time test value.
In step S402, the remaining charging time test value is compared with the actual charging time corresponding to the test condition, so as to obtain an error between the remaining charging time test value and the actual charging time.
And comparing the residual charging time test value with the actual residual charging time corresponding to the direct current test working condition to obtain the error between the residual charging time test value and the actual residual charging time corresponding to the direct current test working condition. Similarly, for the alternating current charging time lookup table, the residual charging time test value and the actual residual charging time corresponding to the alternating current test working condition are compared to obtain an error between the residual charging time test value and the actual residual charging time.
In step S403, when the error is greater than or equal to a preset error threshold, updating the simulation parameters to perform the next simulation test.
If the error between the residual charging time test value and the actual residual charging time corresponding to the direct-current test working condition is large, for example, greater than or equal to a preset error threshold, the simulation parameters of the power battery one-dimensional simulation analysis model in the direct-current state need to be properly adjusted, and the adjusted simulation parameters are input into the power battery one-dimensional simulation analysis model again for simulation test.
Similarly, if the error between the remaining charging time test value and the actual remaining charging time corresponding to the ac test condition is large, for example, greater than or equal to a preset error threshold, the simulation parameters of the power battery one-dimensional simulation analysis model in the ac state need to be appropriately adjusted, and the adjusted simulation parameters are input to the power battery one-dimensional simulation analysis model again for the simulation test.
In step S404, when the error is smaller than the preset error threshold, the simulation test is ended, and the remaining charging time lookup table is output.
And if the error between the residual charging time test value and the actual residual charging time corresponding to the direct current test working condition is smaller, for example, smaller than a preset error threshold, the residual charging time query table is considered to meet the preset error requirement, and the simulation test is ended. Similarly, if the error between the residual charging time test value and the actual residual charging time corresponding to the alternating current test working condition is small, for example, smaller than a preset error threshold, the residual charging time lookup table is considered to meet a preset error requirement, the simulation test is finished, and the residual charging time lookup table is output. The residual charging time query table is subjected to working condition testing, so that the accuracy of the residual charging time query table obtained by a simulation test is favorably provided, and the accuracy and the practicability of the residual charging time are further improved.
The remaining charge time look-up table obtained in step S101 above is applied to the real vehicle to estimate the time required between the current charge and the full charge.
In step S102, at the beginning of charging, a charging state of the power battery is acquired, wherein the charging state includes direct current charging and alternating current charging.
In this embodiment, when charging is started, it is first determined whether the charging state of the power battery is dc charging or ac charging, so as to select the remaining charging time lookup table corresponding to the charging state.
In step S103, the thermal management parameters and the battery residual capacity of the power battery in the charging state are acquired.
Here, when the power battery obtains the remaining charging time by querying the remaining charging time lookup table in the charging state, it is necessary to provide a value of an input parameter of the remaining charging time lookup table. As mentioned above, the input parameters of the remaining charging time lookup table in the dc state include, but are not limited to, the remaining battery capacity and thermal management parameters, including, but not limited to, battery temperature information, battery cooling medium temperature information, and the maximum output power of the dc charging post. The input parameters of the remaining charging time lookup table in the alternating current state include, but are not limited to, the remaining capacity of the battery and thermal management parameters, including, but not limited to, ambient temperature information and the rated power of the vehicle-mounted charger.
In step S104, the remaining charging time lookup table in the charging state is queried according to the thermal management parameter and the battery remaining capacity, so as to obtain the remaining charging time of the power battery.
And finally, selecting a corresponding remaining charging time query table in a charging state, and performing remaining charging time query by taking the thermal management parameters and the battery remaining capacity as input parameters of the remaining charging time query table to obtain the estimated time required by the power battery from the current moment to the full charge of the electric quantity.
In summary, in the embodiment of the invention, the remaining charging time lookup table of the power battery is constructed based on the simulation test, the remaining charging time lookup table includes the corresponding relationship between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters, the influence of the thermal management strategy and the power limitation of the whole vehicle on the charging current in the charging process is fully considered, and the accuracy of the remaining charging time is higher; then when charging is started, acquiring the charging state of the power battery, wherein the charging state comprises direct current charging and alternating current charging; acquiring thermal management parameters and battery residual capacity of the power battery in the charging state; finally, inquiring a remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to obtain the remaining charging time of the power battery; the output of the residual charging time of the power battery is completed in a form of directly inquiring the table, the method is easy to implement on the whole vehicle, the prediction efficiency of the residual charging time is effectively improved, and the charging experience of a user is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In an embodiment, an apparatus for acquiring remaining charging time of a power battery is provided, where the apparatus for acquiring remaining charging time of a power battery corresponds to the method for acquiring remaining charging time of a power battery in the foregoing embodiment one to one. As shown in fig. 5, the device for acquiring the remaining charging time of the power battery includes a construction module 51, a state acquisition module 52, a parameter acquisition module 53, and a time acquisition module 54, and each of the functional modules is described in detail as follows:
the building module 51 is configured to build a remaining charging time lookup table of the power battery based on a simulation test, where the remaining charging time lookup table includes a corresponding relationship between the remaining battery capacity and the remaining charging time of the power battery under different thermal management parameters;
the state acquiring module 52 is configured to acquire a charging state of the power battery at the beginning of charging, where the charging state includes dc charging and ac charging;
a parameter obtaining module 53, configured to obtain a thermal management parameter and a battery remaining capacity of the power battery in the charging state;
and the time obtaining module 54 is configured to query the remaining charging time lookup table in the charging state according to the thermal management parameter and the battery remaining capacity, and obtain the remaining charging time of the power battery.
Optionally, the building module 51 comprises:
the system comprises a model construction unit, a power battery temperature control strategy model and a power battery temperature control strategy model, wherein the model construction unit is used for constructing a power battery one-dimensional simulation analysis model of the whole vehicle thermal management system, and the power battery one-dimensional simulation analysis model comprises a power battery heating model, a power battery cooling heating model and a power battery temperature control strategy model;
the simulation test unit is used for carrying out a direct current/alternating current simulation test on the power battery one-dimensional simulation analysis model and generating a residual charging time query table of the power battery in a direct current state/alternating current state according to a simulation test result;
and the test unit is used for integrating the remaining charging time query table into the whole vehicle for testing and outputting the remaining charging time query table according to a test result.
Optionally, the simulation test unit includes:
the parameter acquisition subunit is used for acquiring simulation parameters and a variation range thereof according to input parameters of the remaining charging time lookup table in the direct current state/alternating current state and design parameters of the whole vehicle;
the simulation test subunit is used for constructing a simulation working condition according to the simulation parameters and the variation range thereof, and respectively inputting simulation parameter values corresponding to the simulation working condition into the power battery one-dimensional simulation analysis model for simulation test;
and the table generating subunit is used for generating a residual charging time query table in the direct current state/alternating current state according to the simulation test result.
Optionally, the test unit comprises:
the testing subunit is used for integrating the remaining charging time query table into the whole vehicle and testing the remaining charging time query table according to the testing working condition to obtain a remaining charging time testing value;
the comparison subunit is used for comparing the residual charging time test value with the actual charging time corresponding to the test working condition to obtain an error between the residual charging time test value and the actual charging time;
the updating subunit is used for updating the simulation parameters to perform the next simulation test when the error is greater than or equal to a preset error threshold;
and the ending subunit is used for ending the simulation test and outputting the remaining charging time query table when the error is smaller than the preset error threshold.
Optionally, the simulation parameters in the dc state include:
the residual electric quantity of the battery, the temperature information of a cooling medium of the battery and the maximum output power of the direct current charging pile.
Optionally, the simulation parameters in the communication state include:
the residual electric quantity of the battery, the ambient temperature information and the rated power of the vehicle-mounted charger.
The specific definition of the device for acquiring the remaining charging time of the power battery can be referred to the definition of the method for acquiring the remaining charging time of the power battery, and is not described herein again. All or part of the modules in the device for acquiring the residual charging time of the power battery can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of:
constructing a remaining charging time lookup table of the power battery based on a simulation test, wherein the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters;
when charging is started, acquiring the charging state of a power battery, wherein the charging state comprises direct current charging and alternating current charging;
acquiring thermal management parameters and battery residual capacity of the power battery in the charging state;
and inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to obtain the remaining charging time of the power battery.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus (Rambus) direct RAM (RDRAM), direct bused dynamic RAM (DRDRAM), and bused dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method for acquiring the residual charging time of a power battery is characterized by comprising the following steps:
constructing a remaining charging time lookup table of the power battery based on a simulation test, wherein the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters;
when charging is started, acquiring the charging state of a power battery, wherein the charging state comprises direct current charging and alternating current charging;
acquiring thermal management parameters and battery residual capacity of the power battery in the charging state;
and inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to obtain the remaining charging time of the power battery.
2. The method for acquiring the remaining charging time of the power battery according to claim 1, wherein the step of constructing the remaining charging time lookup table of the power battery based on the simulation test comprises the following steps:
constructing a power battery one-dimensional simulation analysis model of the whole vehicle thermal management system, wherein the power battery one-dimensional simulation analysis model comprises a power battery heating model, a power battery cooling and heating model and a power battery temperature control strategy model;
performing a direct current/alternating current simulation test on the power battery one-dimensional simulation analysis model, and generating a remaining charging time query table of the power battery in a direct current state/alternating current state according to a simulation test result;
and integrating the remaining charging time query table into the whole vehicle for testing, and outputting the remaining charging time query table according to a test result.
3. The method for obtaining the remaining charging time of the power battery according to claim 2, wherein the performing a dc/ac simulation test on the one-dimensional simulation analysis model of the power battery and generating the remaining charging time lookup table of the power battery in the dc state/ac state according to the simulation test result comprises:
acquiring simulation parameters and a variation range thereof according to input parameters of a residual charging time look-up table in a direct current state/alternating current state and design parameters of the whole vehicle;
establishing simulation working conditions according to the simulation parameters and the variation range thereof, and respectively inputting simulation parameter values corresponding to the simulation working conditions into the power battery one-dimensional simulation analysis model for simulation test;
and generating a residual charging time query table in a direct current state/alternating current state according to the simulation test result.
4. The method for acquiring the remaining charging time of the power battery according to claim 3, wherein the step of integrating the remaining charging time lookup table into a whole vehicle for testing and outputting the remaining charging time lookup table according to the test result comprises the following steps:
integrating the remaining charging time query table on the whole vehicle, and testing the remaining charging time query table according to the test working condition to obtain a remaining charging time test value;
comparing the residual charging time test value with the actual charging time corresponding to the test working condition to obtain an error between the residual charging time test value and the actual charging time;
when the error is larger than or equal to a preset error threshold value, updating the simulation parameters to carry out the next simulation test;
and when the error is smaller than the preset error threshold, ending the simulation test and outputting the remaining charging time lookup table.
5. The method for acquiring the remaining charging time of the power battery according to claim 3 or 4, wherein the simulation parameters in the direct current state comprise:
the residual electric quantity of the battery, the temperature information of a cooling medium of the battery and the maximum output power of the direct current charging pile.
6. The method for acquiring the remaining charging time of the power battery according to claim 3 or 4, wherein the simulation parameters in the alternating current state comprise:
the residual electric quantity of the battery, the ambient temperature information and the rated power of the vehicle-mounted charger.
7. An apparatus for obtaining the remaining charging time of a power battery, the apparatus comprising:
the system comprises a construction module, a storage module and a control module, wherein the construction module is used for constructing a remaining charging time lookup table of the power battery based on a simulation test, and the remaining charging time lookup table comprises the corresponding relation between the battery remaining capacity and the remaining charging time of the power battery under different thermal management parameters;
the state acquisition module is used for acquiring the charging state of the power battery when charging is started, wherein the charging state comprises direct current charging and alternating current charging;
the parameter acquisition module is used for acquiring the thermal management parameters and the battery residual capacity of the power battery in the charging state;
and the time acquisition module is used for inquiring the remaining charging time inquiry table in the charging state according to the thermal management parameters and the battery remaining capacity to acquire the remaining charging time of the power battery.
8. The device for acquiring the remaining charging time of the power battery according to claim 7, wherein the building module comprises:
the system comprises a model construction unit, a power battery temperature control strategy model and a power battery temperature control strategy model, wherein the model construction unit is used for constructing a power battery one-dimensional simulation analysis model of the whole vehicle thermal management system, and the power battery one-dimensional simulation analysis model comprises a power battery heating model, a power battery cooling heating model and a power battery temperature control strategy model;
the simulation test unit is used for carrying out direct current/alternating current simulation test on the power battery one-dimensional simulation analysis model and generating a remaining charging time query table of the power battery in a direct current state/alternating current state according to a simulation test result;
and the test unit is used for integrating the remaining charging time query table into the whole vehicle for testing and outputting the remaining charging time query table according to a test result.
9. The device for acquiring the remaining charging time of the power battery according to claim 8, wherein the simulation test unit comprises:
the parameter acquisition subunit is used for acquiring simulation parameters and a variation range thereof according to input parameters of the remaining charging time lookup table in the direct current state/alternating current state and design parameters of the whole vehicle;
the simulation test subunit is used for constructing a simulation working condition according to the simulation parameters and the variation range thereof, and respectively inputting simulation parameter values corresponding to the simulation working condition into the power battery one-dimensional simulation analysis model for simulation test;
and the table generating subunit is used for generating a residual charging time query table in the direct current state/alternating current state according to the simulation test result.
10. A computer-readable storage medium, which stores a computer program, wherein the computer program, when executed by a processor, implements the method for obtaining remaining charging time of a power battery according to any one of claims 1 to 6.
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