CN116404281A - Battery power MAP switching method, system, storage medium and switching equipment - Google Patents
Battery power MAP switching method, system, storage medium and switching equipment 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
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- B60—VEHICLES IN GENERAL
- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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Abstract
The embodiment of the application discloses a battery power MAP switching method, a system, a storage medium and switching equipment, wherein the battery power MAP switching method comprises the following steps: acquiring offline current MAP and power MAP when a battery is charged and discharged; acquiring polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establishing a corresponding relation between the power MAP and the polarization voltage MAP; and acquiring the real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with the polarization voltage MAP, and switching the real-time power when the battery is charged and discharged according to the corresponding relation between the power MAP and the polarization voltage MAP. According to the method, the polarization voltage during battery charging and discharging is used as a core index, a dynamic and self-adaptive switching method with real-time internal resistance on line is not required to be measured, the power capacity of the battery can be fully displayed, and the stability and reliability of the battery are guaranteed.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a battery power MAP switching method, system, storage medium, and switching device.
Background
At present, new energy automobiles are developed at a high speed, wherein the new energy automobiles taking electric energy as a power source and a motor as a driving device are remarkably developed. The battery and the battery management system are key components of the electric automobile. The battery SOF (State of Function) is an important parameter for battery management system state estimation, and as a core module for battery state estimation, the battery SOF switching strategy has a very important influence on the overall vehicle power performance.
For the determination of battery SOF, the current solutions are all performed by looking up the power pulse spectrum of the line. However, the method has more problems, which easily causes overcharge or overdischarge of the battery in the use process, and the current switching strategy of the power MAP is generally conservative, so that the power performance of the battery cannot be fully utilized; meanwhile, if the parameters such as the battery capacity and the internal resistance change abnormally, the battery can be further damaged if the battery is still executed according to the original strategy. Therefore, how to ensure the stability and reliability of the battery is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a battery power MAP switching method, a system, a storage medium and switching equipment, so as to ensure the stability and reliability of a battery.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
in one aspect, a battery power MAP switching method is provided, including:
acquiring offline current MAP and power MAP when a battery is charged and discharged;
acquiring polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establishing a corresponding relation between the power MAP and the polarization voltage MAP;
and acquiring the real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with the polarization voltage MAP, and switching the real-time power when the battery is charged and discharged according to the corresponding relation between the power MAP and the polarization voltage MAP.
In addition to or in lieu of one or more of the features disclosed above, the obtaining the offline current MAP and the power MAP when the battery is charged and discharged includes:
performing mixed power pulse characteristic test on the battery according to the SOC state and the temperature state of the battery to obtain limit charging current, limit discharging current, limit charging power and limit discharging power when the battery is charged and discharged;
and obtaining offline current MAP and power MAP when the battery is charged and discharged by a power test method according to the limit charging current, the limit discharging current, the limit charging power and the limit discharging power.
In addition to or in lieu of one or more of the features disclosed above, the obtaining the polarization voltage MAP of the battery during charging and discharging from the off-line current MAP includes:
acquiring an open-circuit voltage of a battery during charging and discharging;
acquiring ohmic resistance of a battery during charging and discharging;
and obtaining polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, the open circuit voltage and the ohmic resistor.
In addition to or in lieu of one or more of the features disclosed above, the polarization voltage satisfies U p ＝U ocv –U min –I max R 0 ；
Wherein U is ocv U is the open circuit voltage when the battery is charged and discharged min Is the lower limit cut-off voltage when the battery is charged and discharged, I max U is the limit discharge current when the battery is charged and discharged min I max Selected from off-line current MAP, R 0 Is the ohmic internal resistance of the battery.
In addition to or in lieu of one or more of the features disclosed above, when the battery is in a recharging state, it further comprises:
obtaining a pseudo-two-position electrochemical model of the battery, and calibrating and simulating the pseudo-two-position electrochemical model;
acquiring a threshold value of the negative electrode polarization potential during recharging of the battery and a real-time negative electrode polarization potential according to the calibrated pseudo-two-position electrochemical model;
and comparing the real-time negative polarization potential of the battery during recharging with a threshold value of the negative polarization potential, so as to switch the real-time power of the battery during recharging.
In addition to or in lieu of one or more of the features disclosed above, the obtaining a pseudo-two-position electrochemical model of the battery, calibrating and simulating the pseudo-two-position electrochemical model, includes:
obtaining a pseudo-two-position electrochemical model according to a control equation, boundary conditions and initial values of an electrochemical basic principle;
applying constant-current charging flows with different temperatures and different charging current multiplying powers to the battery according to the pseudo-two-bit electrochemical model, and obtaining battery terminal voltage, positive electrode voltage and negative electrode voltage charging curves with different multiplying powers at different temperatures;
calibrating parameters of the pseudo-two-position electrochemical model by adopting a parameter identification algorithm according to battery terminal voltage, positive electrode voltage and negative electrode voltage charging curves of each multiplying power at each temperature;
and simulating the calibrated parameters to compare and verify with the measured data.
In addition to one or more features disclosed above, or alternatively, the obtaining the threshold value of the negative polarization potential and the real-time negative polarization potential of the battery when recharging according to the calibrated pseudo-two-bit electrochemical model includes:
determining a control algorithm based on voltage feedback for negative polarization potential calculation;
determining control parameters of a control algorithm;
obtaining a measured value of the terminal voltage of the battery at the moment k, obtaining a terminal voltage model calculated value according to a calibrated battery model, and obtaining the difference between the measured value of the terminal voltage at the moment k and the terminal voltage model calculated value;
and obtaining a threshold value of the negative polarization potential at the moment and a real-time negative polarization potential according to the determined control parameter and the difference between the measured value of the terminal voltage at the moment k and the calculated value of the terminal voltage model.
In another aspect, a switching system is further disclosed, comprising: the first acquisition module is used for acquiring offline current MAP and power MAP when the battery is charged and discharged;
the second acquisition module is used for acquiring polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establishing a corresponding relation between the power MAP and the polarization voltage MAP;
the third acquisition module is used for acquiring the real-time polarization voltage of the battery during charging and discharging; and
the switching module is used for comparing the real-time polarization voltage with the polarization voltage MAP and switching the real-time power of the battery during charging and discharging according to the corresponding relation between the power MAP and the polarization voltage MAP; or the real-time negative polarization potential during battery recharging is compared with a threshold value of the negative polarization potential, so that the real-time power during battery recharging is switched.
In another aspect, a computer readable storage medium having stored thereon a computer program for execution by a processor of a method according to any of the preceding claims is further disclosed.
On the other hand, further disclose a switching device, including switching body and electronic equipment, electronic equipment includes: a processor; a memory; and a computer program, wherein the computer program is stored in the memory and configured to be executed by a processor, the computer program comprising instructions for performing the method of any of the above.
One of the above technical solutions has the following advantages or beneficial effects: according to the battery power MAP switching method, the polarization voltage during battery charging and discharging is used as a core index, real-time internal resistance is not required to be measured, when the real-time polarization voltage generated during battery charging and discharging reaches the threshold value of the polarization voltage, battery power can be switched at a certain rate, and the battery power MAP switching method is an online, dynamic and self-adaptive switching method, so that the battery power capacity can be fully displayed, and the stability and reliability of the battery are guaranteed.
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Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flowchart of a battery power MAP switching method provided according to an embodiment of the present application;
FIG. 2 is a graph and power versus time plot of open circuit voltage, power and time provided in accordance with an embodiment of the present application;
FIG. 3 is a graphical representation of battery SOC versus open circuit voltage provided in accordance with an embodiment of the present application;
FIG. 4 is a tabular diagram of control equations provided in accordance with an embodiment of the present application;
fig. 5 is a schematic structural diagram of a switching system provided according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device in a switching device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is presented herein for purposes of illustration only and is not intended to limit the application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. 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 one or more of the described features. In the description of the present application, the meaning of "a plurality" means two or more, unless specifically defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1, in an embodiment of the present application, there is provided a battery power MAP switching method including:
s100, acquiring off-line current MAP and power MAP when a battery is charged and discharged;
the offline current MAP is an ammeter under different temperature conditions and different battery Charge States (SOCs);
the power MAP is a power meter that records the power under different temperature conditions and different battery State of charge (SOC) conditions.
In the embodiment of the application, to obtain the offline power MAP of the battery, the battery cell needs to perform specific current test and power test.
Specifically, step S100 of obtaining the offline current MAP and the power MAP during battery charging and discharging includes:
s110, carrying out mixed power pulse characteristic test on the battery according to the SOC state and the temperature state of the battery to obtain limit charging current, limit discharging current, limit charging power and limit discharging power when the battery is charged and discharged;
s120, obtaining offline current MAP and power MAP when the battery is charged and discharged by a power test method according to the limit charging current, the limit discharging current, the limit charging power and the limit discharging power.
It will be appreciated that the hybrid power pulse characteristic test is a common constant current pulse test method. Referring to fig. 2, the specific operation is such that the battery dc internal resistance DCR in the SOC state and at temperature can be calculated from the voltage variation and the constant current value. According to the DC internal resistance DCR, the open-circuit voltage of the battery and the charge-discharge cut-off voltage, the limit charge-discharge current and the limit charge-discharge power in the period of time can be calculated;
specifically, limit charging current I min The method meets the following conditions: i min ＝(U OC -U max )/R DCR ，
Limiting discharge current I max The method meets the following conditions: i max ＝(U OC -U min )/R DCR ，
Limit charging power P min The method meets the following conditions: p (P) min ＝(U OC -U max )/R DCR *U max ，
Limit discharge power P max The method meets the following conditions: p (P) max ＝(U OC -U min )/R DCR *U min 。
Wherein U is OC R is the open circuit voltage of the battery DCR For the DC internal resistance of the battery, U max For charging cut-off voltage, U min Is the charge cutoff voltage.
By calculating the 4 limit formulas, the current is a constant limit value, the power is not a constant limit value (too large or too small), and the applicable constant power value can be obtained by a test power method.
Referring to fig. 2, the power test method specifically includes the steps of: taking 10s discharge power as an example, let P 1 ＝P max According to power P 1 The constant power discharge is carried out to the cut-off voltage of the battery at the temperature, and the discharge time is t 1 The method comprises the steps of carrying out a first treatment on the surface of the Let P 2 ＝0.9*P max Also according to power P 2 Constant power discharge to the cut-off voltage of the battery at the temperature, and the discharge time is t 2 The method comprises the steps of carrying out a first treatment on the surface of the Let P 3 ＝0.8*P max ，P 4 ＝0.7*P max ，P 5 ＝0.6*P max Obtaining the discharge time t 3 、t 4 、t 5 . The test requires that at least 2 times of time are respectively distributed on two sides of a 10s power line, and the 10s constant discharge power value in the actual process of the battery core can be estimated and obtained through curve fitting results of 5 groups of data, and is recorded as 0 max,10s 。
Therefore, the method and the device can obtain the offline current MAP and the power MAP of battery charging and discharging under different temperatures and different SOC states according to the limit charging current, the limit discharging current, the limit charging power and the limit discharging power.
S200, acquiring polarization voltage MAP when the battery is charged and discharged according to offline current MAP, and establishing a corresponding relation between power MAP and polarization voltage MAP;
the polarization voltage MAP is a voltmeter under different temperature conditions and different battery charge States (SOC);
in the embodiment of the present application, the polarization voltage MAP is a progressive step based on the current MAP and the power MAP, and is not used for obtaining the current change rate and the measured internal resistance value of the battery in real time, and is a polarization voltage calculated based on the open-circuit voltage, the off-line ohmic internal resistance and the cut-off voltage of the battery, which represents the intrinsic property of the battery power. Like other MAPs, the polarization voltage MAP of the cell is also a MAP table of the same dimension.
The battery characteristics can be equivalent to an electronic circuit, and the polarization voltage of the battery can be understood as the voltage of two sections of the RC ring in the battery equivalent circuit model, and the voltage generally consists of electrochemical polarization internal resistance and concentration polarization internal resistance, comprises the resistance characteristics and capacitance characteristics of the battery, belongs to an inertia link and is influenced by the time constant of the battery.
Specifically, in step S200, obtaining the polarization voltage MAP during charging and discharging of the battery according to the offline current MAP includes:
s210, obtaining an open circuit voltage of a battery during charging and discharging;
referring to fig. 3, a mapping relationship between a battery SOC state and an open circuit voltage is embedded in a battery SOC algorithm module, and a current open circuit voltage U of the battery may be obtained according to the mapping relationship ocv 。
S220, acquiring ohmic resistance of the battery during charging and discharging;
the ohmic internal resistance of the battery is divided into a charging ohmic internal resistance and a discharging ohmic internal resistance.
Specifically, ohmic internal resistance R 0 Can be obtained through a mixed power pulse characteristic test, a transient voltage change and a pulse current.
Actually ohmic internal resistance R 0 The value of (2) is related to the factors such as temperature T, state of charge of the battery, current I, charge-discharge state and the like, and preferably, the ohmic internal resistance R is set 0 But is a function of temperature T, battery SOC state, charge-discharge state.
Preferably, ohmic internal resistance R 0 Can be distinguished as charging R 0_Chg And discharge R 0_Dhg The power value can be accurate, R in the application is convenient 0 To charge R 0_Chg And discharge R 0_Dh Average value of (2).
S230, obtaining polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, the open circuit voltage and the ohmic resistor.
Specifically, in the embodiments of the present application, the polarization voltage satisfies U p ＝U ocv –U min –I max R 0 ；
Wherein U is ocv U is the open circuit voltage when the battery is charged and discharged ocv Related to the charge state and temperature of the battery, U min Is the lower limit cut-off voltage when the battery is charged and discharged, I max U is the limit discharge current when the battery is charged and discharged min I max Selected from off-line current MAP, R 0 Is the ohmic internal resistance of the battery and is selected from European and American internal resistance meter.
S300, acquiring real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with polarization voltage MAP, and switching real-time power when the battery is charged and discharged according to the corresponding relation between power MAP and polarization voltage MAP.
It can be understood that the battery power MAP switching method in the application takes the polarization voltage of the battery during charging and discharging as a core index, does not need to measure the real-time internal resistance, and can switch the battery power at a certain rate when the real-time polarization voltage generated during charging and discharging reaches the threshold value of the polarization voltage, so that the battery power MAP switching method is an online, dynamic and self-adaptive switching method, can ensure that the battery power capacity is fully displayed, and ensures the stability and reliability of the battery.
In the embodiments of the present application, the recharging power of the battery is relatively special to the discharging power, and the discharging power is used when the voltage is not exceeded by the lower limit, so that the battery is generally considered to be reliable and safe in engineering. However, the recharging power is not enough for the recharging power, the recharging power setting of the battery needs to meet the condition that the recharging power does not exceed the upper limit cut-off voltage, the negative electrode of the battery is guaranteed not to exceed the polarization potential of the battery, the influence of the polarization potential of the negative electrode needs to be considered, once the preset threshold value of the polarization potential of the negative electrode is reached in advance, power switching is needed even if the polarization voltage capacity is still needed, so that the recovery of the lithium potential of the negative electrode is guaranteed, and the recharging power setting of the battery meet a single condition, namely a switching command is executed.
Thus, when the battery is in a recharging state, the battery power MAP switching method further comprises:
s400, acquiring a pseudo-two-position electrochemical model of the battery, and calibrating and simulating the pseudo-two-position electrochemical model;
in an embodiment of the present application, the obtaining the pseudo-two-position electrochemical model of the battery, calibrating and simulating the pseudo-two-position electrochemical model includes:
s410, acquiring a pseudo-two-position electrochemical model according to a control equation, boundary conditions and initial values of an electrochemical basic principle;
wherein the control equation is shown in the table of fig. 4.
The pseudo-bipositional electrochemical model can reflect the overpotential of the negative electrode, and the pseudo-bipositional electrochemical model comprises, but is not limited to, an electrochemical mechanism model, an equivalent circuit model and the like. Preferably, the pseudo-two-position electrochemical model is an electrochemical mechanism model.
S420, applying constant-current charging flows with different temperatures and different charging current multiplying powers to the battery according to the pseudo-two-bit electrochemical model, and obtaining battery terminal voltage, positive electrode voltage and negative electrode voltage charging curves with different multiplying powers at different temperatures;
the battery may be a reference electrode, which is an electrode providing a stable reference potential, including, but not limited to, metallic lithium, lithium-plated copper wire, tin-lithium alloy.
S430, calibrating parameters of the pseudo-two-position electrochemical model by adopting a parameter identification algorithm according to the battery terminal voltage, the positive electrode voltage and the negative electrode voltage charging curve of each multiplying power at each temperature;
the parameter identification algorithm includes, but is not limited to, a least squares algorithm, a genetic algorithm, an ant colony algorithm, and the like.
The main purpose of calibrating the parameters of the pseudo-two-position electrochemical model is to determine the exact values of the various physical and electrochemical parameters in the model.
S440, simulating the calibrated parameters to compare and verify with the measured data.
S500, acquiring a threshold value of the negative electrode polarization potential during recharging of the battery and a real-time negative electrode polarization potential according to the calibrated pseudo-two-bit electrochemical model;
in an embodiment of the present application, the obtaining, according to the calibrated pseudo-two-bit electrochemical model, a threshold value of a negative polarization potential and a real-time negative polarization potential of the battery during recharging includes:
s510, determining a control algorithm based on voltage feedback for calculating the polarization potential of the negative electrode;
among them, control algorithms include, but are not limited to, proportional-integral-derivative (PID) control algorithms, kalman filter algorithms (KF), neural network control algorithms, and the like. After the selected algorithm is determined, it is no longer changed.
S520, determining control parameters of a control algorithm;
wherein, after the control parameter is determined, no change can occur any more; or as an improvement of the step, the control parameters can be reset after the battery service environment and the state of the battery change in the charging process, so that the application range of the rapid charging method is enlarged.
S530, obtaining a measured value of the terminal voltage of the battery at the moment k, obtaining a terminal voltage model calculated value according to a calibrated battery model, and obtaining the difference between the measured value of the terminal voltage at the moment k and the terminal voltage model calculated value;
s540, acquiring a threshold value of the negative polarization potential at the moment and a real-time negative polarization potential according to the determined control parameter and the difference between the measured value of the terminal voltage at the moment k and the calculated value of the terminal voltage model.
In a preferred embodiment of the present application, the threshold value of the negative polarization potential at a temperature below 0 degrees celsius is selected to be 0.1V, and the threshold value of the negative polarization potential at a temperature above 0 degrees celsius is selected to be 0.15V.
It should be noted that the pseudo-two-position electrochemical model of the battery does not have a strong operational capability, and the optimized model needs to be loaded into the pseudo-two-position electrochemical model application layer software in the form of a closed-loop controller.
And S600, comparing the real-time negative polarization potential of the battery during recharging with a threshold value of the negative polarization potential, so as to switch the real-time power of the battery during recharging.
It can be understood that in the battery power MAP switching method, when the battery is in a recharging state, the electrochemical mechanism model is used for calculating the polarization potential of the negative electrode in real time, and once the negative electrode of the battery reaches a lithium precipitation state, the rate switching is also performed when the polarization voltage does not reach the standard, so that the battery is always in a safe state, and the stability and the reliability of the battery are ensured.
On the other hand, in an embodiment of the present application, referring to fig. 5, the present application further provides a switching system, including: the first obtaining module 210 is configured to obtain an offline current MAP and a power MAP when the battery is charged and discharged; the second obtaining module 220 is configured to obtain a polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establish a correspondence between the power MAP and the polarization voltage MAP; a third obtaining module 230, configured to obtain a real-time polarization voltage when the battery is charged and discharged; and a switching module 240 for comparing the real-time polarization voltage with the polarization voltage MAP and switching the real-time power of the battery during charging and discharging according to the corresponding relation between the power MAP and the polarization voltage MAP; or the real-time negative polarization potential during battery recharging is compared with a threshold value of the negative polarization potential, so that the real-time power during battery recharging is switched.
In another aspect, in an embodiment of the present application, there is also provided a computer readable storage medium having stored thereon a computer program for executing the method according to any of the above.
In an embodiment of the present application, the storage medium may be located on at least one network device of a plurality of network devices in a network.
Further, the storage medium is arranged to store program code for performing the steps of:
s100, determining offline current MAP and power MAP when a battery is charged and discharged;
s200, acquiring polarization voltage MAP when the battery is charged and discharged according to offline current MAP, and establishing a corresponding relation between power MAP and polarization voltage MAP;
s300, acquiring real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with polarization voltage MAP, and switching real-time power when the battery is charged and discharged according to the corresponding relation between power MAP and polarization voltage MAP.
Specific examples in this embodiment may refer to examples described in the above embodiments, and this will not be described in detail in this embodiment.
In an embodiment of the present application, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a U disk, ROM, RAM, a mobile hard disk, a magnetic disk or an optical disk.
On the other hand, in the embodiment of the present application, referring to fig. 6, the present application further provides a switching device, including a switching body and an electronic device, where the electronic device may be a server, a terminal, or a combination thereof. The electronic device includes: a processor 310; a memory 320; and a computer program, wherein the computer program is stored in the memory 320 and configured to be executed by the processor 310, the computer program comprising instructions for performing the method according to any of the preceding claims.
In particular, when the processor 310 is configured to execute the computer program stored on the memory 320, the following steps are implemented:
s100, determining offline current MAP and power MAP when a battery is charged and discharged;
s200, acquiring polarization voltage MAP when the battery is charged and discharged according to offline current MAP, and establishing a corresponding relation between power MAP and polarization voltage MAP;
s300, acquiring real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with polarization voltage MAP, and switching real-time power when the battery is charged and discharged according to the corresponding relation between power MAP and polarization voltage MAP.
In an embodiment of the present application, the electronic device further includes: communication bus 330, processor 310 and memory 320 communicate with each other via communication bus 330.
Further, the communication bus may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or an EISA (Extended Industry Standard Architecture ) bus, or the like. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, only one thick line is shown in fig. 6, but not only one bus or one type of bus. The communication bus is used for communication between the electronic apparatus and other devices.
Further, the memory 320 may include RAM or nonvolatile memory (non-volatile memory), such as at least one magnetic disk memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.
As an example, the memory 320 may include, but is not limited to, a first acquiring module 210, a second acquiring module 220, a third acquiring module 230, and a switching module 240 in a switching system of the device. In addition, other module units in the switching system of the above device may be included, but are not limited to, and are not described in detail in this example.
Further, the processor 310 may be a general purpose processor, which may include, but is not limited to: CPU (Central Processing Unit ), NP (Network Processor, network processor), etc.; but also DSP (Digital Signal Processing, digital signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable gate array) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
Specific examples in this embodiment may refer to examples described in the foregoing embodiments, and this embodiment is not described herein.
It will be appreciated by those skilled in the art that the structure shown in fig. 6 is only illustrative, and the device implementing the above-mentioned clear liquid fast charge cycle test method may be a terminal device, and the terminal device may be a smart phone (such as an Android mobile phone, an iOS mobile phone, etc.), a tablet computer, a palm computer, a mobile internet device (Mobile Internet Devices, MID), a PAD, etc. Fig. 6 is not limited to the structure of the electronic device. For example, the electronic device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 6, or have a different configuration than shown in FIG. 6.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device to execute in association with hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, etc.
The above steps are presented merely to aid in understanding the method, structure, and core ideas of the present application. It will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the principles of the application, which are also intended to be within the scope of the appended claims.
Claims (10)
1. A battery power MAP switching method, comprising:
acquiring offline current MAP and power MAP when a battery is charged and discharged;
acquiring polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establishing a corresponding relation between the power MAP and the polarization voltage MAP;
and acquiring the real-time polarization voltage when the battery is charged and discharged, comparing the real-time polarization voltage with the polarization voltage MAP, and switching the real-time power when the battery is charged and discharged according to the corresponding relation between the power MAP and the polarization voltage MAP.
2. The battery power MAP switching method of claim 1, wherein the obtaining the offline current MAP and the power MAP during the battery charging and discharging includes:
performing mixed power pulse characteristic test on the battery according to the SOC state and the temperature state of the battery to obtain limit charging current, limit discharging current, limit charging power and limit discharging power when the battery is charged and discharged;
and obtaining offline current MAP and power MAP when the battery is charged and discharged by a power test method according to the limit charging current, the limit discharging current, the limit charging power and the limit discharging power.
3. The battery power MAP switching method of claim 1, wherein the obtaining the polarization voltage MAP of the battery during charging and discharging according to the offline current MAP includes:
acquiring an open-circuit voltage of a battery during charging and discharging;
acquiring ohmic resistance of a battery during charging and discharging;
and obtaining polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, the open circuit voltage and the ohmic resistor.
4. The battery power MAP switching method of claim 3, wherein the polarization voltage satisfies U p ＝U ocv –U min –I max R 0 ；
Wherein U is ocv U is the open circuit voltage when the battery is charged and discharged min Is the lower limit cut-off voltage when the battery is charged and discharged, I max U is the limit discharge current when the battery is charged and discharged min I max Selected from off-line current MAP, R 0 Is the ohmic internal resistance of the battery.
5. The battery power MAP switching method of any one of claims 1 to 4, further comprising, when the battery is in a recharging state:
obtaining a pseudo-two-position electrochemical model of the battery, and calibrating and simulating the pseudo-two-position electrochemical model;
acquiring a threshold value of the negative electrode polarization potential during recharging of the battery and a real-time negative electrode polarization potential according to the calibrated pseudo-two-position electrochemical model;
and comparing the real-time negative polarization potential of the battery during recharging with a threshold value of the negative polarization potential, so as to switch the real-time power of the battery during recharging.
6. The battery power MAP switching method of claim 5, wherein the obtaining the pseudo-two-bit electrochemical model of the battery, calibrating and simulating the pseudo-two-bit electrochemical model, comprises:
obtaining a pseudo-two-position electrochemical model according to a control equation, boundary conditions and initial values of an electrochemical basic principle;
applying constant-current charging flows with different temperatures and different charging current multiplying powers to the battery according to the pseudo-two-bit electrochemical model, and obtaining battery terminal voltage, positive electrode voltage and negative electrode voltage charging curves with different multiplying powers at different temperatures;
calibrating parameters of the pseudo-two-position electrochemical model by adopting a parameter identification algorithm according to battery terminal voltage, positive electrode voltage and negative electrode voltage charging curves of each multiplying power at each temperature;
and simulating the calibrated parameters to compare and verify with the measured data.
7. The battery power MAP switching method of claim 5, wherein the obtaining the threshold value of the negative polarization potential and the real-time negative polarization potential at the time of battery recharging according to the calibrated pseudo-two-bit electrochemical model comprises:
determining a control algorithm based on voltage feedback for negative polarization potential calculation;
determining control parameters of a control algorithm;
obtaining a measured value of the terminal voltage of the battery at the moment k, obtaining a terminal voltage model calculated value according to a calibrated battery model, and obtaining the difference between the measured value of the terminal voltage at the moment k and the terminal voltage model calculated value;
and obtaining a threshold value of the negative polarization potential at the moment and a real-time negative polarization potential according to the determined control parameter and the difference between the measured value of the terminal voltage at the moment k and the calculated value of the terminal voltage model.
8. A switching system, comprising: the first acquisition module is used for acquiring offline current MAP and power MAP when the battery is charged and discharged;
the second acquisition module is used for acquiring polarization voltage MAP when the battery is charged and discharged according to the offline current MAP, and establishing a corresponding relation between the power MAP and the polarization voltage MAP;
the third acquisition module is used for acquiring the real-time polarization voltage of the battery during charging and discharging; and
the switching module is used for comparing the real-time polarization voltage with the polarization voltage MAP and switching the real-time power of the battery during charging and discharging according to the corresponding relation between the power MAP and the polarization voltage MAP; or the real-time negative polarization potential during battery recharging is compared with a threshold value of the negative polarization potential, so that the real-time power during battery recharging is switched.
9. A storage medium, the storage medium being a computer-readable storage medium having a computer program stored thereon, characterized by: the computer program being adapted to be executed by a processor by a method according to any of claims 1-7.
10. A switching device, comprising a switching body and an electronic device, the electronic device comprising: a processor; a memory; and a computer program, wherein the computer program is stored in the memory and configured to be executed by a processor, the computer program comprising instructions for performing the method of any of claims 1-7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117227576A (en) * | 2023-11-15 | 2023-12-15 | 广汽埃安新能源汽车股份有限公司 | Battery power control method, storage medium, and electronic device |
| CN118386940A (en) * | 2024-06-28 | 2024-07-26 | 浙江凌骁能源科技有限公司 | Power control method, apparatus, controller, battery pack, vehicle, medium, and program product |
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- 2022-12-29 CN CN202211716714.3A patent/CN116404281A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117227576A (en) * | 2023-11-15 | 2023-12-15 | 广汽埃安新能源汽车股份有限公司 | Battery power control method, storage medium, and electronic device |
| CN117227576B (en) * | 2023-11-15 | 2024-02-27 | 广汽埃安新能源汽车股份有限公司 | Battery power control method, storage medium, and electronic device |
| CN118386940A (en) * | 2024-06-28 | 2024-07-26 | 浙江凌骁能源科技有限公司 | Power control method, apparatus, controller, battery pack, vehicle, medium, and program product |
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