CN113030742B - Method, device and equipment for estimating battery capacity - Google Patents
Method, device and equipment for estimating battery capacity Download PDFInfo
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Abstract
The application provides a method for estimating battery capacity, which comprises the following steps: the method comprises the steps of obtaining a current of a target battery at the current moment, and determining a current correction coefficient of the target battery at the current moment according to the current of the target battery at the current moment, a preset reference current of the target battery and a Pockets constant; acquiring the current battery temperature of the target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient; and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery. By implementing the method, the accuracy of battery capacity estimation is improved by determining the current correction coefficient and the temperature correction coefficient of the battery.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, and a device for estimating battery capacity.
Background
For a battery system of a new energy automobile, battery capacity is one of important parameters, and in the battery system, the battery capacity has important significance in key problems such as estimation of the state of charge of a battery, distribution and prediction of battery energy, and balancing effect among battery packs, so that accurate estimation of the battery capacity plays a vital role in the charging and discharging process of the battery.
In the prior art, a table look-up method is adopted to estimate the battery capacity, the battery capacities under the conditions of different temperatures and different charge and discharge multiplying factors are obtained through battery charge and discharge experiments in advance, then a table is established according to the corresponding relation between the battery capacity obtained in the experiments and the temperatures and the charge and discharge currents, and the battery capacity is estimated by using the table look-up method.
Disclosure of Invention
The application provides a method for estimating battery capacity, which improves the accuracy of battery capacity estimation by determining a current correction coefficient and a temperature correction coefficient of a battery under the condition of considering the influence of battery temperature and battery current on the battery capacity.
In a first aspect, an embodiment of the present application provides a method for estimating a battery capacity, where the method includes:
the method comprises the steps of obtaining a current of a target battery at the current moment, and determining a current correction coefficient of the target battery at the current moment according to the current of the target battery at the current moment, a preset reference current of the target battery and a Pockets constant;
acquiring the current battery temperature of the target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relationship between the current battery temperature of the target battery and the temperature correction coefficient;
and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery.
In one possible implementation manner, the correspondence between the battery temperature of the target battery and the temperature correction coefficient is:
wherein eta T And the temperature correction coefficient is T, the battery temperature of the target battery at the current moment is T, and a, b and c are respectively a plurality of correction parameters which are obtained in advance.
In a possible embodiment, the determining the temperature correction coefficient of the target battery at the current time comprises:
acquiring the actual capacities of the target battery at a plurality of preset temperatures respectively by calculating the charging time from a fully discharged state to a fully charged state by using first preset current when the target battery is at the plurality of preset temperatures;
acquiring a plurality of actual capacities of the target battery at the preset temperatures, and determining a corresponding relation between the battery temperature and the temperature correction coefficient of the target battery according to the preset temperatures, the actual capacities of the target battery at the preset temperatures and the reference capacity of the target battery.
Optionally, the current correction coefficient of the target battery at the current moment
Wherein I is the current of the target battery at the current moment, I 0 And n is the Pockett constant, which is the reference current of the target battery.
In a possible embodiment, the determining the current correction factor of the target battery at the current moment comprises:
acquiring a first preset temperature of the target battery, and calculating the actual capacity of the target battery under at least one preset current value according to the charging time of at least one preset current value from a fully discharged state to a fully charged state;
and determining the Pockett constant according to the at least one preset current value, the actual capacity of the target battery under the at least one preset current value and the reference capacity of the target battery.
Optionally, the battery capacity Q = η of the target battery at the current moment I ×η T ×Q 0 Wherein eta I A current correction factor, eta, for the current time of the target battery T A temperature correction coefficient, Q, for the current time of the target battery 0 Is the reference capacity of the target battery.
In one possible implementation manner, the obtaining the current of the target battery at the current time includes:
and acquiring the preset reference temperature of the target battery, and calculating the reference capacity of the target battery according to the reference charging time of the preset reference current from the fully discharged state to the fully charged state.
In a second aspect, an embodiment of the present application provides an estimation apparatus for battery capacity, the estimation apparatus including:
the acquisition module is used for acquiring the current of the target battery at the current moment;
the determining module is used for determining a current correction coefficient of the target battery at the current moment according to the battery current of the target battery at the current moment, the preset reference current of the target battery and a pocketed constant;
the acquisition module is further used for acquiring the battery temperature of the target battery at the current moment;
the determining module is further configured to determine a temperature correction coefficient of the target battery at the current time according to the battery temperature of the target battery at the current time and a corresponding relationship between the battery temperature of the target battery and the temperature correction coefficient;
the determining module is further configured to determine the battery capacity of the target battery at the current time according to the current correction coefficient of the target battery at the current time, the temperature correction coefficient of the target battery at the current time, and the reference capacity of the target battery.
In a third aspect, an embodiment of the present application further provides an electronic device, where the electronic device includes a processor and a memory, where the processor is configured to execute a computer program stored in the memory, so as to implement the steps of any one of the foregoing possible embodiments.
In a fourth aspect, the present application further provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps of the above aspects.
In the application, a battery capacity estimation device acquires a current of a target battery at the current moment, and determines a current correction coefficient of the target battery at the current moment according to the current of the target battery at the current moment, a preset reference current of the target battery and a Pockets constant; acquiring the current battery temperature of the target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient; and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery. By implementing the embodiment of the application, the current correction coefficient and the temperature correction coefficient of the battery are determined to improve the accuracy of battery capacity estimation under the condition that the influence of the battery temperature and the battery current on the battery capacity is considered.
Drawings
Fig. 1 is a schematic flow chart of a method for estimating battery capacity according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for determining pockets constants according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a method for determining a correspondence between a battery temperature and a temperature correction coefficient according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a battery capacity estimation apparatus according to an embodiment of the present disclosure;
fig. 5 is a block diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
The following describes embodiments of the present application in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flowchart of a method for estimating battery capacity according to an embodiment of the present disclosure. As shown in fig. 1, the specific implementation steps of the estimation method of the battery capacity are as follows:
s100, the battery current of the target battery at the current moment is obtained by the battery capacity estimation device, and the current correction coefficient of the target battery at the current moment is determined according to the battery current of the target battery at the current moment, the preset reference current of the target battery and the Pockett constant.
Specifically, before the estimating device of the battery capacity obtains the battery current of the target battery at the current time in step S100, the method includes: and acquiring the preset reference temperature of the target battery, and calculating the reference capacity of the target battery according to the reference charging time of the preset reference current from the fully discharged state to the fully charged state. For example, the preset reference temperature is 25 ℃, the preset reference current is a current with a multiplying power of 1C, it should be noted that C is a ratio, i.e. a multiplying power, for representing the magnitude of the charge and discharge current of the battery, taking a battery with a capacity of 1200mAh as an example, 1C represents 1200mA (1 multiplying power of 1200 mAh), 0.2C represents 240mA (0.2 multiplying power of 1200 mAh), the estimation device of the battery capacity obtains a reference charge time of the target battery at 25 ℃, and charges the target battery from a fully discharged state to a fully charged state with a current of 1200mA, integrates the 1200mA current in the reference charge time, and calculates the reference capacity of the target battery as:
wherein Q 0 Is the reference capacity of the target battery, t 1 For the reference charging time, I 0 Is the preset reference current. It is understood that the preset reference current may be 0.5C, 2C, 3C, etc., and the preset reference temperature may also be 30 ℃, 20 ℃, 31 ℃, etc., which is not limited in this application.
In one possible embodiment, the current correction factor of the target battery at the current moment is obtained according to a pockels equation, which is an equation describing a change in battery capacity with the magnitude of battery current, and is expressed as follows:
I n ×t＝k 1 equation 2
Wherein I is the battery current, t is the battery discharge time, n is the Pockets constant, k 1 Is a constant of the theoretical capacity of the battery.
From equation 2, the relationship between the charging current and the battery capacity during the charging process of the battery can be obtained as follows:
I n-1 ×It＝I n-1 ×Q＝k 1 equation 3
Wherein I is the battery current, t is the battery discharge time, n is the Pockett constant, k 1 Q is the battery capacity of the battery under the condition of the battery current I, which is a constant of the theoretical capacity of the battery.
If the current of the battery current I is the preset reference current I 0 The battery discharge time is t 1 At a predetermined reference current I 0 The battery capacity under the condition of (1) is Q 0 Then equation 3 can be expressed as:
I 0 n-1 ×Q 0 ＝k 1 equation 4
From equations 3 and 4, the battery capacity of the battery under circuit I conditions can be expressed as:
in a possible implementation, the preset reference current I 0 And a preset reference capacity Q of the target battery 0 For the known quantities stored in the estimation means of the capacity of the battery, the pockets constant n is related to the structure of the battery, in particular to the plate thickness, generally n is comprised between 1.15 and 1.42, the pockets constant n is related to the model of the battery, and the following will describe in detail how to determine the pockets constant in conjunction with the attached figures.
In practical application, the PuckThe specific constant n is a known quantity, so the preset reference current I of the above equation 5 0 A preset reference capacity Q of the target battery 0 And the pockels constant n is a known quantity, equation 5 can describe the influence of the battery current on the battery capacity, and thus the battery correction coefficient of the target battery at the current moment can be expressed as:
wherein eta I For the battery correction factor, I is the current of the target battery at the current moment, I 0 And n is the Pockett constant, which is the reference current of the target battery.
S101, the battery temperature of the target battery at the current moment is obtained by the estimation device of the battery capacity, and the temperature correction coefficient of the target battery at the current moment is determined according to the battery temperature of the target battery at the current moment and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient.
Specifically, the basic operation principle of the battery is essentially a series of chemical reactions of the active material, and the arrhenius equation expresses the relationship between the chemical reaction rate and the temperature of the active material during the electrochemical reaction, and the arrhenius equation expresses the following:
wherein k is 2 For reaction rate constants, A is the Arrhenius constant, E a R is a gas constant and T is a cell temperature for reaction activation energy. It can be understood that, for the battery, the higher the battery temperature is, the higher the battery capacity is, and the battery temperature and the battery capacity are in a proportional relationship, then the reference capacity Q of the target battery is obtained in step S100 0 As a reference, k 2 And obtaining the battery capacity of the target battery at the current moment by using a proportional coefficient, wherein the proportional coefficient is expressed as:
Q＝k 2 ×Q 0 ＝ae -b/T-c ×Q 0 equation 8
Wherein Q is the current battery capacity of the target battery, Q 0 For the reference capacity, a, b and c are a plurality of correction parameters determined in advance, respectively. It is understood that the parameter a in equation 8 corresponds to a in equation 7, and b in equation 8 corresponds to E in equation 7 a Correspondingly, T-c in formula 8 corresponds to RT in formula 7, the correspondence between formula 7 and formula 8 is a formula-formal correspondence, not a correspondence of specific parameter values, and a, b, and c in formula 8 are correction parameters determined through a large number of experiments. The following will explain in detail how to determine the three correction parameters a, b and c with reference to the drawings.
In practical application, the correction parameters a, b, c and Q in the above formula 8 0 Equation 8 may describe the influence of the battery temperature on the battery capacity, and thus the correspondence between the battery temperature of the target battery and the temperature correction coefficient may be expressed as:
wherein eta T And the temperature correction coefficient is T, the battery temperature of the target battery at the current moment is T, and a, b and c are respectively a plurality of correction parameters which are obtained in advance.
S102, the estimation device of the battery capacity determines the battery capacity of the target battery at the current moment according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery.
Specifically, the current correction coefficient is determined in step S100, the temperature correction coefficient is determined in step S101, and after the step S100 and the step S101, the battery capacity estimating device may determine that the battery capacity of the target battery at the current time is:
Q＝η I ×η T ×Q 0 equation 10
Wherein eta I A current correction coefficient, eta, for the current time of the target battery T A temperature correction coefficient, Q, for the current time of the target battery 0 Is the reference capacity of the target battery.
In the application, a battery capacity estimation device acquires a current of a target battery at the current moment, and determines a current correction coefficient of the target battery at the current moment according to the current of the target battery at the current moment, a preset reference current of the target battery and a pockels constant; acquiring the current battery temperature of the target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient; and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery. By implementing the embodiment, the accuracy of the battery capacity estimation is improved by determining the current correction coefficient and the temperature correction coefficient of the battery under the condition that the influence of the battery temperature and the battery current on the battery capacity is considered.
Further, after the accuracy of estimating the battery capacity is improved, in a battery system of the new energy automobile, the residual electric quantity of the battery can be estimated according to the battery capacity estimated by the method, and the accuracy of the cruising ability of the automobile is estimated; the battery capacity estimated according to the method can provide more accurate basis for formulation of the balancing strategy among the battery packs, optimization of charging and discharging efficiency among the battery packs in the automobile is achieved, and the like, so that the accuracy of battery capacity estimation has great significance for battery system management in a new energy automobile.
How to determine the pockets constant in the current correction coefficient is described in detail below with reference to the accompanying drawings, referring to fig. 2, fig. 2 is a schematic flow chart of a method for determining the pockets constant provided in the embodiment of the present application. As shown in fig. 2, the specific implementation steps are as follows:
s200, the estimation device of the battery capacity acquires that the target battery is at a first preset temperature, and the actual capacity of the target battery under at least one preset current value is calculated according to the charging time from the fully-discharged state to the fully-charged state of at least one preset current value. Specifically, during the experiment, the target battery may be placed in a thermostat, such as an incubator, and the first preset temperature is a temperature set in the thermostat. In an actual application process, the estimation device of the battery capacity may acquire the battery temperature of the target battery as the first preset temperature through a temperature sensor. For example, the first preset temperature is 40 ℃, the at least one preset current value is 1A, optionally, the target battery is discharged before the target battery is charged, and if the target battery is a lithium battery, the target battery is discharged to a lower limit protection voltage of the lithium battery, and at this time, the target battery is in a completely discharged state. Furthermore, the target battery after complete discharge can be kept still for a period of time, which is beneficial to reducing the influence of complete discharge of the target battery on subsequent steps. The estimation device of the battery capacity charges the target battery from a full discharge state to a full charge state with a current of 1A, and it can be understood that the estimation device of the battery capacity can acquire the voltage of the target battery through a voltage sensor to determine whether the target battery is in the full discharge state or in the full charge state, for example, when the target battery is a lithium battery, the battery voltage in the full discharge state is 2.6V, the battery voltage in the full charge state is 4.2V, and the lower limit protection voltage and the full charge voltage of the battery are different according to different actual manufacturers, which exemplifies how to determine whether the battery is in the full discharge state or in the full charge state. The battery capacity estimating device acquires a first charging time for charging the target battery from a fully discharged state to a fully charged state, and integrates the 1A charging current over the first charging time to obtain a first actual capacity Q 1 Step S201 is performed. Because the application uses constant current charging as indicationFor example, the integral of the 1A charging current in the first charging time may also be understood as a product of the 1A current and the first charging time, but it should be noted that, in other possible implementations, constant-current charging and then constant-voltage charging may be performed, that is, the charging current of the target battery is variable, a hall current sensor is used to collect the battery current of the target battery in real time, and then the battery capacity estimation device integrates the collected battery current of the target battery until the target battery is in a full-charge state, which does not limit the battery charging mode.
S201, the estimation device of the battery capacity determines the Pockett constant according to the at least one preset current value, the actual capacity of the target battery under the at least one preset current value and the reference capacity of the target battery. Specifically, refer to the above formula 5,I 0 And Q + As is known, Q may be calculated in step S200, I is 1A, optionally, the battery capacity estimating device may also adopt a hall current sensor to collect the charging circuit I in real time, and then the preset reference current I is obtained according to formula 5 0 The reference capacity Q 0 Battery current I, actual capacity Q of battery in state of battery current I 1 And the pockets constant n five parameters I 0 、Q 0 And I and Q are known, the pockets constant n corresponding to the target battery can be calculated. Furthermore, a plurality of charge and discharge tests can be performed, and the accuracy of the pocketed constant n can be improved by performing data processing, such as averaging, median or mode, on the pocketed constant n obtained by each calculation.
How to determine the corresponding relationship between the battery temperature and the temperature correction coefficient is described in detail below with reference to the accompanying drawings, referring to fig. 3, fig. 3 is a schematic flow chart of a method for determining the corresponding relationship between the battery temperature and the temperature correction coefficient according to an embodiment of the present application. As shown in fig. 3, the specific implementation steps are as follows:
s300, the estimation device of the battery capacity acquires that the target battery is at a plurality of preset temperatures,and calculating the actual capacities of the target batteries at the plurality of preset temperatures respectively according to the charging time from the fully discharged state to the fully charged state by using a first preset current. Specifically, during the course of the experiment, the target battery may be placed in a thermostat, such as an incubator, and a plurality of preset temperatures, for example, 30 ℃, 35 ℃, and 40 ℃ may be obtained by changing the constant temperature of the thermostat. Optionally, the target battery is discharged before being charged, and if the target battery is a lithium battery, the target battery is discharged to a lower limit protection voltage of the lithium battery, and at this time, the target battery is in a complete discharge state. Furthermore, the target battery after complete discharge can be kept still for a period of time, which is beneficial to reducing the influence of complete discharge of the target battery on the subsequent steps. The estimation device of battery capacity charges the target battery from a fully discharged state to a fully charged state with a current of 1A, and it can be understood that the estimation device of battery capacity can acquire the voltage of the target battery through a voltage sensor to determine whether the target battery is in the fully discharged state or in the fully charged state, for example, when the target battery is a lithium battery, the battery voltage is 2.6V in the fully discharged state, the battery voltage is 4.2V in the fully charged state, and the lower limit protection voltage and the fully charged voltage of the battery are different according to different actual manufacturers, which exemplifies how to determine whether the battery is in the fully discharged state or in the fully charged state. Taking the preset temperature of 30 ℃ and the first preset current of 1A as examples, the estimation device of the battery capacity obtains a second charging time from full charging to full charging of the target battery, and integrates the first preset current 1A in the second charging time to obtain a second actual capacity Q of the target battery under the condition of 30 DEG C 2 (ii) a Optionally, the preset temperature is changed to 35 ℃, the first preset current is 1A, the battery capacity estimation device obtains a third charging time from full charging to full charging of the target battery, and integrates the third charging time with the first preset current 1A to obtain a third actual capacity of the target battery at 35 ℃Q 3 (ii) a Changing the preset temperature to 40 ℃, the first preset current to 1A, the estimation device of the battery capacity obtains the fourth charging time from full charging to full charging of the target battery, and the estimation device of the first preset current 1A integrates the fourth charging time to obtain the fourth actual capacity Q of the target battery under the condition of 40 DEG C 4 In this way, since the corresponding relationship between the battery temperature and the temperature correction coefficient of the target battery is determined in this embodiment, the first preset current value may be controlled to be the same, in a possible implementation manner, the charging current of the target battery is variable, and the battery current of the target battery is acquired in real time by the battery capacity estimation device through the hall current sensor.
S301, the estimation device of the battery capacity acquires a plurality of actual capacities of the target battery at the preset temperatures, and determines a corresponding relation between the battery temperature of the target battery and the temperature correction coefficient according to the preset temperatures, the actual capacities of the target battery at the preset temperatures and the reference capacity of the target battery. Specifically, the estimation device of the battery capacity calculates a plurality of actual capacities Q through step S300 2 、Q 3 And Q 4 The reference capacity Q of the target battery can be obtained by the step S100 described above in conjunction with fig. 1 0 The estimation device of the battery capacity respectively outputs a plurality of preset temperatures of 30 ℃, 35 ℃ and 40 ℃ and corresponding actual capacities Q 2 、Q 3 And Q 4 Substituting equation 8 can obtain three equations, so that three correction parameters a, b and c can be obtained. Similarly, a plurality of charging and discharging experiments can be performed, and the three correction parameters a, b and c obtained by each calculation are subjected to data processing, such as averaging, median or mode, so that the accuracy of the correction parameters can be improved, and the corresponding relationship between the battery temperature of the target battery and the temperature correction coefficient is more accurate.
An embodiment of the present application provides an estimation apparatus for battery capacity, and referring to fig. 4, fig. 4 is a block diagram of a structure of an estimation apparatus for battery capacity according to an embodiment of the present application. As shown in fig. 4, the battery capacity estimation device 40 includes:
an obtaining module 400, configured to obtain a current of a target battery at a current moment;
the determining module 401 is configured to determine a current correction coefficient of the target battery at the current time according to the battery current of the target battery at the current time, a preset reference current of the target battery, and a pocketed constant;
the obtaining module 400 is further configured to obtain a battery temperature of the target battery at the current moment;
the determining module 401 is further configured to determine a temperature correction coefficient of the target battery at the current time according to the battery temperature of the target battery at the current time and a corresponding relationship between the battery temperature of the target battery and the temperature correction coefficient;
the determining module 401 is further configured to determine the battery capacity of the target battery at the current time according to the current correction coefficient of the target battery at the current time, the temperature correction coefficient of the target battery at the current time, and the reference capacity of the target battery.
In one possible implementation manner, the correspondence between the battery temperature of the target battery and the temperature correction coefficient is:
wherein eta T And the temperature correction coefficient is T, the battery temperature of the target battery at the current moment is T, and a, b and c are respectively a plurality of correction parameters which are obtained in advance.
In a possible embodiment, the device for estimating battery capacity further includes a calculating module 202, configured to obtain a plurality of preset temperatures of the target battery, and calculate actual capacities of the target battery at the plurality of preset temperatures respectively according to a charging time from a fully discharged state to a fully charged state at a first preset current;
the obtaining module 400 is further configured to obtain a plurality of actual capacities of the target battery at the plurality of preset temperatures;
the determining module 401 is further configured to determine a corresponding relationship between the battery temperature of the target battery and the temperature correction coefficient according to the preset temperatures, the actual capacities of the target battery at the preset temperatures, and the reference capacity of the target battery.
Optionally, the current correction coefficient of the target battery at the current moment
Wherein I is the current of the target battery at the current moment, I 0 And n is the Pockett constant, which is the reference current of the target battery.
In a possible embodiment, the calculating module 402 is further configured to obtain a first preset temperature of the target battery, and calculate an actual capacity of the target battery at least one preset current value according to a charging time from a fully discharged state to a fully charged state;
the determining module 401 is further configured to determine the pocketed constant according to the at least one preset current value, the actual capacity of the target battery at the at least one preset current value, and the reference capacity of the target battery.
Optionally, the battery capacity Q = η of the target battery at the current time I ×η T ×Q 0 Wherein eta I A current correction coefficient, eta, for the current time of the target battery T A temperature correction coefficient, Q, for the current time of the target battery 0 Is the reference capacity of the target battery.
In a possible implementation manner, the calculating module 402 is further configured to obtain a preset reference temperature of the target battery, and calculate the reference capacity of the target battery according to a reference charging time of the preset reference current from a fully discharged state to a fully charged state.
The embodiment is implemented to improve the accuracy of battery capacity estimation by determining the current correction coefficient and the temperature correction coefficient of the battery in consideration of the influence of the battery temperature and the battery current on the battery capacity.
Referring to fig. 5, fig. 5 is an electronic device provided in an embodiment of the present application. As shown in fig. 5, the electronic device 50 includes a processor 500 and a memory 501, wherein:
the processor 500 may be a Central Processing Unit (CPU), and may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 501 stores instructions, and it is understood that the memory 301 stores preset reference current, reference capacity, pockels constant and/or correction parameter of the target battery. Illustratively, the memory 501 may include both read-only memory and random access memory, and provides instructions and data to the processor 501. A portion of the memory 501 may also include non-volatile random access memory. For example, the memory 501 may also store device type information.
The processor 500 is configured to execute the computer program stored in the memory to implement any one of the possible embodiments described above.
In a specific implementation, the electronic device may execute, through each built-in functional module, the implementation manners provided in the steps in fig. 1 to fig. 4, which may be specifically referred to the implementation manners provided in the steps in fig. 1 to fig. 4, and are not described herein again.
The present application provides a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform any one of the possible embodiments described above.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the embodiments provided in the present application, it should be understood that the disclosed method, apparatus, and system may be implemented in other ways. The above-described embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A method of estimating battery capacity, the method comprising:
acquiring a first preset temperature of a target battery, and calculating the actual capacity of the target battery at least one preset current value according to the charging time of at least one preset current value from a fully discharged state to a fully charged state;
determining a Pockett constant according to the at least one preset current value, the actual capacity of the target battery at the at least one preset current value and the reference capacity of the target battery;
acquiring the current of the target battery at the current moment, and determining a current correction coefficient of the target battery at the current moment according to the current of the target battery at the current moment, the preset reference current of the target battery and the Pockett constant;
acquiring the current battery temperature of the target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient; wherein, the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient is as follows:
wherein eta T The temperature correction coefficient is the temperature correction coefficient, T is the battery temperature of the target battery at the current moment, and a, b and c are a plurality of correction parameters which are obtained in advance respectively;
and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery.
2. The method of claim 1, wherein determining the temperature correction factor for the target battery at the current time is preceded by:
acquiring the actual capacities of the target battery at a plurality of preset temperatures respectively by calculating the charging time from a fully discharged state to a fully charged state by using first preset current when the target battery is at the plurality of preset temperatures;
acquiring a plurality of actual capacities of the target battery at the preset temperatures, and determining the corresponding relation between the battery temperature and the temperature correction coefficient of the target battery according to the preset temperatures, the actual capacities of the target battery at the preset temperatures and the reference capacity of the target battery.
3. The method of claim 1, wherein the current correction factor for the current time of the target battery
Wherein I is the current of the target battery at the current moment, I 0 And n is the Pockett constant, which is the reference current of the target battery.
4. The method of claim 1, wherein the target battery has a current time of battery capacity Q = η £ of the target battery I ×η T ×Q 0 Wherein eta I A current correction coefficient, eta, for the current time of the target battery T A temperature correction coefficient, Q, for the current time of the target battery 0 Is the reference capacity of the target battery.
5. The method of claim 1, wherein obtaining the current of the target battery at the current time comprises:
and acquiring the preset reference temperature of the target battery, and calculating the reference capacity of the target battery according to the reference charging time of the preset reference current from the fully discharged state to the fully charged state.
6. An estimation device of a battery capacity, characterized in that the estimation device comprises:
the acquisition module is used for acquiring that the target battery is at a first preset temperature;
the calculation module is used for calculating the actual capacity of the target battery under at least one preset current value according to the charging time from the fully-discharged state to the fully-charged state;
the determining module is used for determining a Pockett constant according to the at least one preset current value, the actual capacity of the target battery under the at least one preset current value and the reference capacity of the target battery;
the acquisition module is further used for acquiring the current of the target battery at the current moment;
the determining module is further configured to determine a current correction coefficient of the target battery at the current moment according to the battery current of the target battery at the current moment, a preset reference current of the target battery, and the pockets constant;
the acquisition module is further used for acquiring the battery temperature of the target battery at the current moment;
the determining module is further configured to determine a temperature correction coefficient of the target battery at the current time according to the battery temperature of the target battery at the current time and a corresponding relationship between the battery temperature of the target battery and the temperature correction coefficient; wherein, the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient is as follows:
wherein eta T Setting a temperature correction coefficient, T as the current battery temperature of the target battery, and a, b and c as a plurality of predetermined correction parameters;
the determining module is further configured to determine the battery capacity of the target battery at the current time according to the current correction coefficient of the target battery at the current time, the temperature correction coefficient of the target battery at the current time, and the reference capacity of the target battery.
7. An electronic device, characterized in that the electronic device comprises a processor and a memory, wherein the processor is configured to execute a computer program stored in the memory to implement the steps of the method according to any one of claims 1 to 5.
8. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the steps of the method according to any one of claims 1 to 5.
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| CN113900027B (en) * | 2021-09-30 | 2023-06-30 | 蜂巢能源科技有限公司 | Battery SOC estimation method, device, control unit and computer readable storage medium |
| CN113978311B (en) * | 2021-10-15 | 2024-05-17 | 潍柴动力股份有限公司 | Battery temperature correction method and device and electronic equipment |
| CN114171810A (en) * | 2021-12-03 | 2022-03-11 | 珠海迈巨微电子有限责任公司 | Battery deformation detection-based battery monitoring method and device and electronic equipment |
| CN115825782B (en) * | 2022-01-24 | 2023-10-27 | 宁德时代新能源科技股份有限公司 | Capacity calculation method and device for power battery |
| CN115436809B (en) * | 2022-09-28 | 2024-04-30 | 欣旺达动力科技股份有限公司 | Method for estimating battery capacity, electronic device and storage medium |
| CN116937006B (en) * | 2023-09-14 | 2023-12-26 | 深圳市首航新能源股份有限公司 | Temperature control method and energy storage system |
| CN117420463B (en) * | 2023-12-19 | 2024-03-26 | 浙江地芯引力科技有限公司 | Method and device for updating chemical capacity of battery, electronic equipment and storage medium |
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