CN113910976B - Power battery control method and device of electric automobile and electric automobile - Google Patents
Power battery control method and device of electric automobile and electric automobile Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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Abstract
The application discloses a power battery control method and device of an electric automobile and the electric automobile, wherein the method comprises the following steps: calculating peak power and continuous power according to the detected actual state of charge and actual temperature of the power battery; when the maximum allowable power of the power battery is the peak power, if the actual power of the power battery is between the continuous power and the peak power, calculating the actual capacity of the power battery by using the peak power or the continuous power, wherein the actual capacity is the actual discharge capacity or the actual recovery capacity, calculating the first maximum duration of the actual power according to the actual capacity, and controlling the maximum allowable power of the power battery to be switched from the peak power to the continuous power when the continuous operation time of the power battery reaches the first maximum duration. Therefore, the problems that the maximum running time of the power battery is fixed, the performance of the power battery cannot be fully exerted, the performance of a vehicle is reduced and the like when the maximum allowable power of the power battery is the peak power in the related technology are solved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a power battery control method and device of an electric automobile and the electric automobile.
Background
SOP (State of Power) estimation is one of the core algorithms of a Power battery management system, and refers to the maximum discharge Power that a Power battery of an electric vehicle can provide at the next moment and when sustaining a large current.
In the related art, a peak power meter and a continuous power meter are generally arranged in an electric automobile, and state switching of the SOP is realized through switching of 2 tables, namely, switching of the maximum allowable power of a power battery is realized. When the maximum allowable power of the power battery is the peak power, the control process of the power battery is as follows: when the actual power of the power battery exceeds the continuous power, the maximum operation time corresponding to the peak power is counted, and after the maximum operation time is reached, the maximum allowable power of the power battery is switched to the continuous power.
However, in the related art, when the maximum allowable power of the power battery is the peak power, whether the actual power reaches the peak power or not, the power battery is controlled to operate according to the maximum operation time corresponding to the peak power when the actual power exceeds the continuous power, so that the performance of the power battery cannot be fully exerted, and the performance of the vehicle is reduced.
Disclosure of Invention
The application provides a power battery control method and device for an electric automobile and the electric automobile, and aims to solve the problems that when the maximum allowable power of the power battery in the related technology is peak power, the maximum running time of the power battery is fixed, the performance of the power battery cannot be fully exerted, the performance of the automobile is reduced and the like.
An embodiment of a first aspect of the present application provides a power battery control method for an electric vehicle, including the following steps: detecting the actual state of charge and the actual temperature of the power battery; calculating peak power and continuous power of the power battery according to the actual state of charge and the actual temperature; when the maximum allowable power of the power battery is the peak power, if the actual power of the power battery is smaller than the peak power and the actual power is larger than the continuous power, calculating the actual discharge capacity or the actual recovery capacity of the power battery by using the peak power or calculating the actual discharge capacity or the actual recovery capacity of the power battery by using the continuous power, calculating the first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity, and controlling the maximum allowable power of the power battery to be switched from the peak power to the continuous power when the continuous operation time of the power battery reaches the first maximum duration.
Further, the calculating the first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity includes: acquiring the actual current of the power battery; the first maximum duration is calculated from the actual discharge capacity or the actual recovery capacity and the actual current.
Further, calculating an actual discharge capacity or recovery capacity of the power cell using the peak power, comprising: calculating the peak current of the power battery according to the peak power; and calculating the actual discharge capacity or the actual recovery capacity according to the second maximum duration corresponding to the peak current and the peak power.
Further, calculating an actual discharge capacity or an actual recovery capacity of the power battery using the continuous power includes: calculating the continuous current of the power battery according to the continuous power; and calculating the actual discharge capacity or the actual recovery capacity according to the third maximum duration corresponding to the continuous current and the continuous power.
Further, the calculating the peak power and the continuous power of the power battery according to the actual state of charge and the actual temperature includes: matching the peak power by searching a peak power table according to the actual state of charge and the actual temperature; and matching the continuous power by searching a continuous power table according to the actual charge state and the actual temperature.
An embodiment of a second aspect of the present application provides a power battery control device of an electric vehicle, including: the detection module is used for detecting the actual state of charge and the actual temperature of the power battery; the first calculation module is used for calculating the peak power and the continuous power of the power battery according to the actual state of charge and the actual temperature; a second calculation module, configured to calculate, when the maximum allowable power of the power battery is the peak power, an actual discharge capacity or an actual recovery capacity of the power battery using the peak power or calculate an actual discharge capacity or an actual recovery capacity of the power battery using the continuous power if the actual power of the power battery is less than the peak power and the actual power is greater than the continuous power, and calculate a first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity; and the control module is used for controlling the maximum allowable power of the power battery to be switched from the peak power to the continuous power when the continuous operation time of the power battery reaches the first maximum duration.
Further, the second computing module includes: an acquisition unit for acquiring an actual current of the power battery; a first calculation unit for calculating the first maximum duration from the actual discharge capacity or the actual recovery capacity and the actual current.
Further, the second computing module includes: a second calculation unit, configured to calculate a peak current of the power battery according to the peak power, and calculate the actual discharge capacity or the actual recovery capacity according to the peak current and a second maximum duration corresponding to the peak power; and a third calculation unit, configured to calculate a continuous current of the power battery according to the continuous power, and calculate the actual discharge capacity or the actual recovery capacity according to the continuous current and a third maximum duration corresponding to the continuous power.
Further, the first computing module includes: the first matching unit is used for matching the peak power by searching a peak power table according to the actual state of charge and the actual temperature; and the second matching unit is used for matching the continuous power by searching a continuous power table according to the actual charge state and the actual temperature.
An embodiment of a third aspect of the present application provides an electric vehicle, including the power battery control device of the electric vehicle described in the foregoing embodiment.
Therefore, the application has at least the following beneficial effects:
when the maximum allowable power of the power battery is the peak power, the maximum running time which can be born by the power battery currently is determined according to the actual power, so that the problem that the performance of the power battery cannot be fully exerted due to the fact that the maximum running time is fixed is avoided, the performance of the power battery can be fully exerted by adjusting the maximum running time, the power performance of a vehicle can be effectively improved, and the use experience of a user is improved. Therefore, the problems that in the related art, when the maximum allowable power of the power battery is the peak power, the maximum running time of the power battery is fixed, the performance of the power battery cannot be fully exerted, the performance of a vehicle is reduced and the like are solved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a power battery control method of an electric vehicle according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of obtaining peak power and continuous power according to an embodiment of the present application;
FIG. 3 is a flowchart of estimating a maximum continuous operation time corresponding to an actual current of a power battery according to an embodiment of the present application;
FIG. 4 is an exemplary plot of an isovolumetric linear estimation result curve for a maximum continuous operation time corresponding to the actual power of a power cell according to an embodiment of the present application;
FIG. 5 is a graph of maximum continuous operation time corresponding to actual current of a power battery and corrected maximum continuous operation time according to an embodiment of the present application;
fig. 6 is a block diagram of a power battery control device of an electric vehicle according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
SOP estimation is one of BMS (Building Management System, power battery management system) core algorithms, is an important reference for vehicle acceleration, climbing and energy recovery, and from the perspective of a user, SOP directly represents the power performance during acceleration. In the related art, the SOP estimation is generally implemented by using switching of a peak power meter and a continuous power meter, when the real-time power exceeds the continuous power, the maximum bearing time of the peak power is counted, for example, 30s, and after the time is reached, the maximum allowable power is switched to the continuous power corresponding to the continuous power meter.
Specifically, the power prediction SOP of the BMS is composed of two tables, i.e., a peak power table and a continuous power table, of the power battery characteristics, for example, a power table with a duration of 30s and a power table with a duration of 60s, wherein the peak power table value is greater than the continuous power table value. The SOP estimation estimates the maximum allowable power using the peak power meter when the actual power is lower than the continuous power, and switches the continuous power meter when the actual power is higher than the continuous power for more than a duration, such as 30s; when the actual power is lower than the continuous power, the power meter used for SOP estimation may be switched to the peak power meter again.
However, although the look-up table strategy may satisfy the characteristics of the power battery, the battery capacity is not fully developed because the maximum time that the battery can withstand must exceed 30s when the actual power is greater than the sustained power but well below the peak power, which is partially underutilized. Therefore, the application fully exerts the battery capacity by utilizing a software strategy, defines the size of the actual power exceeding the continuous power and adjusts the allowable time in real time.
The following describes a power battery control method and device of an electric vehicle and the electric vehicle according to the embodiments of the present application with reference to the accompanying drawings. Aiming at the problems that in the related art mentioned in the background center, when the maximum allowable power of the power battery is the peak power, the maximum operation time of the power battery is fixed, the performance of the power battery cannot be fully exerted, and the performance of a vehicle is reduced, the application provides a power battery control method of an electric automobile. Therefore, the problems that in the related art, when the maximum allowable power of the power battery is the peak power, the maximum running time of the power battery is fixed, the performance of the power battery cannot be fully exerted, the performance of a vehicle is reduced and the like are solved.
Specifically, fig. 1 is a schematic flow chart of a power battery control method of an electric vehicle according to an embodiment of the present application. Since p=ui and U are the acquirable amounts, the power meter is equivalent to an ammeter, and in the following examples, the power meter is taken as an example.
As shown in fig. 1, the power battery control method of the electric vehicle includes the following steps:
in step S101, the actual state of charge and the actual temperature of the power battery are detected.
The state of charge (SOC) refers to a ratio of a remaining capacity of a battery after the battery is used for a period of time or is left unused for a long period of time to a capacity of a fully charged state of the battery, and is generally expressed as a percentage, for example, an actual state of charge of the power battery is 80% or 60%.
In step S102, the peak power and the continuous power of the power battery are calculated from the actual state of charge and the actual temperature.
The peak power refers to the maximum allowable power corresponding to the peak power meter, and the continuous power refers to the maximum allowable power corresponding to the continuous power meter.
In this embodiment, calculating the peak power and the continuous power of the power battery according to the actual state of charge and the actual temperature includes: matching peak power by searching a peak power meter according to the actual state of charge and the actual temperature; the continuous power is matched by looking up a continuous power meter according to the actual state of charge and the actual temperature.
It will be appreciated that, as shown in fig. 2, after detecting the actual state of charge and the actual temperature, the embodiments of the present application may find the peak power table and the continuous power to obtain the peak power and the continuous power, respectively.
Examples of the peak power table and the continuous power are shown in tables 1 and 2, respectively, and the abscissa in tables 1 and 2 represents the SOC value and the ordinate represents the temperature value.
TABLE 1
TABLE 2
In step S103, when the maximum allowable power of the power battery is the peak power, if the actual power of the power battery is smaller than the peak power and the actual power is larger than the continuous power, the actual discharge capacity or the actual recovery capacity of the power battery is calculated by using the peak power, or the actual discharge capacity or the actual recovery capacity of the power battery is calculated by using the continuous power, and the first maximum duration of the actual power is calculated according to the actual discharge capacity or the actual recovery capacity, and when the continuous operation time of the power battery reaches the first maximum duration, the maximum allowable power of the power battery is controlled to be switched from the peak power to the continuous power.
The first maximum duration refers to the maximum duration that the power battery can last when running at actual power.
It can be understood that when the maximum allowable power of the power battery is the peak power, for the actual power between the continuous power and the peak power, the embodiment of the application is not limited to the fixed running time defined by the peak power meter, but calculates the actual discharge capacity or the actual recovery capacity of the current power battery, and further calculates the maximum running time that the power battery can bear currently, thereby fully utilizing the discharge or recovery performance of the battery, improving the discharge or recovery performance of the vehicle, and improving the use experience of the user.
In the present embodiment, the actual discharge capacity or the actual recovery capacity may be calculated in various ways in the embodiment of the present application, which is not particularly limited.
As one possible implementation, calculating the actual discharge capacity or recovery capacity of the power cell using the peak power includes: calculating peak current of the power battery according to the peak power; and calculating the actual discharge capacity or the actual recovery capacity according to the second maximum duration corresponding to the peak current and the peak power.
Wherein, the embodiment of the application can utilize the formula P Peak to peak ＝UI Peak to peak Calculating peak current of the power battery, wherein U is voltage of the power battery, and P is the voltage of the power battery Peak to peak For peak power, I Peak to peak Is peak current; the second maximum duration is the maximum running time corresponding to the peak power, and is a preset calibration value, for example, 30S or 40S. Taking the second maximum duration as 30S and the vehicle in a discharge state as an example, the actual discharge capacity k=30×i Peak to peak 。
In this embodiment, the peak power meter is taken as an example, and the peak current may be obtained by using the peak current meter in some embodiments, which is not particularly limited.
As another possible implementation, calculating the actual discharge capacity or actual recovery capacity of the power cell using the continuous power includes: calculating the continuous current of the power battery according to the continuous power; and calculating the actual discharge capacity or the actual recovery capacity according to the third maximum duration corresponding to the continuous current and the continuous power.
Wherein, the embodiment of the application can utilize the formula P Holding device ＝UI Holding device Calculating the continuous current of the power battery, wherein U is the voltage of the power battery, and P is the voltage of the power battery Holding device For continuous power, I Holding device Is a continuous current; the second maximum duration is the maximum running time corresponding to the peak power, and is a predetermined calibration value, for example, may be 60S or 70S. Taking the second maximum duration as 70S and the vehicle in a discharge state as an example, the actual discharge capacity k=60×i Holding device 。
In this embodiment, the continuous power meter is taken as an example, and the continuous current may be obtained by using the continuous current meter in some embodiments, which is not limited specifically.
In this embodiment, calculating the first maximum duration of the actual power from the actual discharge capacity or the actual recovery capacity includes: acquiring the actual current of a power battery; the first maximum duration is calculated from the actual discharge capacity or the actual recovery capacity and the actual current.
It is understood that, as shown in fig. 3, the embodiment of the present application may calculate the first maximum duration according to the actual state of charge, the actual temperature, and the actual current. The derivation of the first maximum duration is illustrated as follows:
(1) Assume that the duration current and peak current time are 60s and 30s, respectively;
(2) The discharge capacity of the batteries is equal on the premise of not damaging the batteries. The method comprises the following steps: capacity k=i Peak to peak *30＝I Holding device *60；
(3) The actual current is I Actual practice is that of The calculation formula of the first maximum duration is: t (T) SOI/SOP ＝k/I Actual practice is that of So that the maximum duration of the actual current operation, i.e. the maximum duration of the actual power operation, can be estimated.
For example, taking SOC of 80% and temperature of 20 ℃, the peak power of 255kw and the maximum duration of 30s can be obtained from the peak power table values shown in table 1; the continuous power at this time was 127kw and the maximum duration was 60s by the continuous power meter shown in table 2; the maximum duration time corresponding to the peak power meter and the continuous power meter can be calibrated in advance; the embodiment of the application can perform isovolumetric linear estimation on the duration when the actual power is less than 255kw and the actual power is more than 127.5, and the estimation result is shown as 4.
In some embodiments, to further improve the accuracy of the running time for which the actual current of the power battery can last, after the first maximum duration is calculated, a correction may be further performed, which is specifically as follows:
assuming that the actual current of the power battery has equal discharge capacity between the peak current and the continuous current, the corresponding allowable duration is shown in fig. 5, wherein the actual current in the graph has the corresponding allowable duration (i.e. curve 1 in the graph), and the fixed duration is taken forward for switching time, so as to obtain the actual durationInterval t Actual practice is that of (i.e., curve 2 in the figure). Thus, when the real-time current is greater than the continuous current, i.e. the actual power is greater than the continuous power, t Actual practice is that of ＝I Peak to peak *t Peak to peak /I Actual practice is that of At this time t Actual practice is that of For the duration that the actual current of the default power cell can run.
In consideration of the fact that certain conversion time is needed for current change, the embodiment of the application can also correct the first maximum duration according to the current conversion time, so that accuracy of the duration running time of the actual current of the power battery is improved, and damage to the power battery is avoided while battery performance is fully utilized; wherein the corrected first maximum duration t Duration of time ＝t Actual practice is that of -t Rotation And (5) time exchange.
According to the power battery control method for the electric automobile, when the maximum allowable power of the power battery is the peak power, the maximum running time which can be born currently by the power battery is determined according to the actual power, and the problem that the performance of the power battery cannot be fully exerted due to the fact that the maximum running time is fixed is avoided, so that the performance of the power battery can be fully exerted by adjusting the maximum running time, the power performance of the automobile can be effectively improved, and the use experience of a user is improved.
Next, a power battery control device of an electric vehicle according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 6 is a block schematic diagram of a power battery control device of an electric vehicle according to an embodiment of the present application.
As shown in fig. 6, the power battery control device 10 of the electric vehicle includes: the device comprises a detection module 100, a first calculation module 200, a second calculation module 300 and a control module 400.
The detection module 100 is used for detecting the actual state of charge and the actual temperature of the power battery; the first calculation module 200 is configured to calculate peak power and continuous power of the power battery according to the actual state of charge and the actual temperature; the second calculating module 300 is configured to calculate, when the maximum allowable power of the power battery is the peak power, if the actual power of the power battery is less than the peak power and the actual power is greater than the continuous power, an actual discharge capacity or an actual recovery capacity of the power battery using the peak power, or calculate an actual discharge capacity or an actual recovery capacity of the power battery using the continuous power, and calculate a first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity; the control module 400 is configured to control the maximum allowable power of the power cell to switch from peak power to continuous power when the continuous operation time of the power cell reaches a first maximum duration.
Further, the second calculation module 300 includes: an acquisition unit and a first calculation unit. The acquisition unit is used for acquiring the actual current of the power battery; the first calculation unit is used for calculating a first maximum duration according to the actual discharge capacity or the actual recovery capacity and the actual current.
Further, the second calculation module 300 includes: a second calculation unit and a third calculation unit. The second calculation unit is used for calculating the peak current of the power battery according to the peak power, and calculating the actual discharge capacity or the actual recovery capacity according to the peak current and the second maximum duration corresponding to the peak power; the third calculation unit is used for calculating the continuous current of the power battery according to the continuous power, and calculating the actual discharge capacity or the actual recovery capacity according to the continuous current and the third maximum duration corresponding to the continuous power.
Further, the first computing module 200 includes: the first matching unit is used for matching peak power by searching a peak power table according to the actual state of charge and the actual temperature; the second matching unit is used for matching the continuous power by searching a continuous power table according to the actual state of charge and the actual temperature.
It should be noted that the foregoing explanation of the embodiment of the power battery control method of the electric vehicle is also applicable to the power battery control device of the electric vehicle of this embodiment, and will not be repeated here.
According to the power battery control device of the electric automobile, when the maximum allowable power of the power battery is the peak power, the maximum running time which can be born currently by the power battery is determined according to the actual power, and the problem that the performance of the power battery cannot be fully exerted due to the fact that the maximum running time is fixed is avoided, so that the performance of the power battery can be fully exerted by adjusting the maximum running time, the power performance of a vehicle can be effectively improved, and the use experience of a user is improved.
In addition, the embodiment also provides an electric automobile, which comprises the power battery control device of the electric automobile. When the maximum allowable power of the power battery is the peak power, the maximum running time which can be born by the power battery currently is determined according to the actual power, and the problem that the performance of the power battery cannot be fully exerted due to the fact that the maximum running time is fixed is avoided, so that the performance of the power battery can be fully exerted by adjusting the maximum running time, the power performance of the vehicle can be effectively improved, and the use experience of a user is improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. The power battery control method of the electric automobile is characterized by comprising the following steps of:
detecting the actual state of charge and the actual temperature of the power battery;
calculating peak power and continuous power of the power battery according to the actual state of charge and the actual temperature; and
when the maximum allowable power of the power battery is the peak power, if the actual power of the power battery is smaller than the peak power and the actual power is larger than the continuous power, calculating the actual discharge capacity or the actual recovery capacity of the power battery by using the peak power or calculating the actual discharge capacity or the actual recovery capacity of the power battery by using the continuous power, calculating the first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity, and controlling the maximum allowable power of the power battery to be switched from the peak power to the continuous power when the continuous operation time of the power battery reaches the first maximum duration.
2. The method of claim 1, wherein the calculating the first maximum duration of the actual power from the actual discharge capacity or the actual recovery capacity comprises:
acquiring the actual current of the power battery;
the first maximum duration is calculated from the actual discharge capacity or the actual recovery capacity and the actual current.
3. The method according to claim 1 or 2, wherein calculating an actual discharge capacity or recovery capacity of the power cell using the peak power comprises:
calculating the peak current of the power battery according to the peak power;
and calculating the actual discharge capacity or the actual recovery capacity according to the second maximum duration corresponding to the peak current and the peak power.
4. The method according to claim 1 or 2, characterized in that calculating an actual discharge capacity or an actual recovery capacity of the power battery using the continuous power comprises:
calculating the continuous current of the power battery according to the continuous power;
and calculating the actual discharge capacity or the actual recovery capacity according to the third maximum duration corresponding to the continuous current and the continuous power.
5. The method of claim 1, wherein said calculating peak power and continuous power of said power cell from said actual state of charge and said actual temperature comprises:
matching the peak power by searching a peak power table according to the actual state of charge and the actual temperature;
and matching the continuous power by searching a continuous power table according to the actual charge state and the actual temperature.
6. A power battery control device of an electric vehicle, comprising:
the detection module is used for detecting the actual state of charge and the actual temperature of the power battery;
the first calculation module is used for calculating the peak power and the continuous power of the power battery according to the actual state of charge and the actual temperature;
a second calculation module, configured to calculate, when the maximum allowable power of the power battery is the peak power, an actual discharge capacity or an actual recovery capacity of the power battery using the peak power or calculate an actual discharge capacity or an actual recovery capacity of the power battery using the continuous power if the actual power of the power battery is less than the peak power and the actual power is greater than the continuous power, and calculate a first maximum duration of the actual power according to the actual discharge capacity or the actual recovery capacity; and
and the control module is used for controlling the maximum allowable power of the power battery to be switched from the peak power to the continuous power when the continuous operation time of the power battery reaches the first maximum duration.
7. The apparatus of claim 6, wherein the second computing module comprises:
an acquisition unit for acquiring an actual current of the power battery;
a first calculation unit for calculating the first maximum duration from the actual discharge capacity or the actual recovery capacity and the actual current.
8. The apparatus of claim 6 or 7, wherein the second computing module comprises:
a second calculation unit, configured to calculate a peak current of the power battery according to the peak power, and calculate the actual discharge capacity or the actual recovery capacity according to the peak current and a second maximum duration corresponding to the peak power;
and a third calculation unit, configured to calculate a continuous current of the power battery according to the continuous power, and calculate the actual discharge capacity or the actual recovery capacity according to the continuous current and a third maximum duration corresponding to the continuous power.
9. The apparatus of claim 6, wherein the first computing module comprises:
the first matching unit is used for matching the peak power by searching a peak power table according to the actual state of charge and the actual temperature;
and the second matching unit is used for matching the continuous power by searching a continuous power table according to the actual charge state and the actual temperature.
10. An electric vehicle, characterized by comprising the power battery control device of an electric vehicle according to any one of claims 6 to 9.
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