CN116587925A - Method and device for updating full charge capacity of battery, electronic equipment and storage medium - Google Patents
Method and device for updating full charge capacity of battery, electronic equipment and storage medium Download PDFInfo
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- CN116587925A CN116587925A CN202310532608.8A CN202310532608A CN116587925A CN 116587925 A CN116587925 A CN 116587925A CN 202310532608 A CN202310532608 A CN 202310532608A CN 116587925 A CN116587925 A CN 116587925A
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000007599 discharging Methods 0.000 claims abstract description 48
- 238000004422 calculation algorithm Methods 0.000 claims description 27
- 238000004590 computer program Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 101100391182 Dictyostelium discoideum forI gene Proteins 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/13—Maintaining the SoC within a determined range
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Abstract
The application relates to a method, a device, an electronic device and a storage medium for updating full charge capacity of a battery, wherein the method comprises the following steps: acquiring a first open-circuit voltage of the battery before charging and discharging, and acquiring the first residual electric quantity of the battery before charging and discharging according to a residual electric quantity-open-circuit voltage relation curve and the first open-circuit voltage; acquiring a second open-circuit voltage after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to a residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage; acquiring the full charge capacity updated by the battery for the previous time; and obtaining the full charge capacity updated at this time according to the full charge capacity, the first residual capacity and the second residual capacity of the battery updated at the previous time, and calculating and updating the full charge capacity of the battery without completely filling the battery and discharging the battery completely after the battery is completely filled, so that the updating cost of the full charge capacity of the battery is reduced.
Description
Technical Field
The present application relates to the field of batteries, and in particular, to a method, an apparatus, an electronic device, and a storage medium for updating a full charge capacity of a battery.
Background
At present, the power battery is widely applied to products such as electric cars, electric motorcycles, electric bicycles, solar energy, mobile communication terminal products and energy storage. With the popularity of power cells, rapid charging has become a constantly sought-after goal.
Recently, chargeable and dischargeable batteries are widely used as energy sources for mobile devices, auxiliary power devices, electric Vehicles (EVs), hybrid Electric Vehicles (HEVs), plug-in hybrid electric vehicles (plug-in HEVs), or similar electronic devices. The rechargeable battery is charged to supplement the original consumed electric energy, and when the battery is fully charged is related to when the battery stops receiving the charging power. Therefore, it is important to determine the correct full charge capacity (full charge capacity, FCC) information for the battery.
However, FCC information for chargeable and dischargeable batteries is easily changed as the battery ages and the current operating temperature. The battery aging means that the battery is repeatedly charged (i.e., the number of charging cycles (cycle count)) several hundred times or more. The current operating temperature is the temperature at which the battery is actually operating. Existing FCC updates to batteries typically take a long time to fully discharge the battery after it is fully charged and may increase the number of recharging cycles, resulting in damage to the battery.
Disclosure of Invention
The application provides a method, a device, an electronic device and a storage medium for updating the full charge capacity of a battery, which are used for calculating and updating the full charge capacity of the battery without completely filling the battery and discharging the battery completely after the battery is completely filled, thereby reducing the updating cost of the full charge capacity of the battery and improving the updating efficiency, and the specific scheme is as follows:
in a first aspect, there is provided a method of updating full charge capacity of a battery, the method comprising:
acquiring a first open-circuit voltage of a battery before charging and discharging, and acquiring a first residual capacity of the battery before charging and discharging according to a residual capacity-open-circuit voltage relation curve and the first open-circuit voltage;
acquiring a second open-circuit voltage of the battery after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to the residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage;
acquiring the full charge capacity updated by the battery for the previous time;
and obtaining the updated full charge capacity according to the updated full charge capacity of the battery, the first residual capacity and the second residual capacity.
Further, the target state includes a charge-discharge state under a non-flat region of the battery.
Further, the obtaining the first open-circuit voltage of the battery before charging and discharging includes:
acquiring a first current voltage of the battery before charging and discharging;
judging whether a first current voltage of the battery before charging and discharging is in a first preset range, and if the first current voltage is in the first preset range, performing a first compensation algorithm on the first current voltage to obtain a first open-circuit voltage corresponding to the first open-circuit voltage at normal temperature.
Further, the obtaining the second open-circuit voltage of the battery before charging and discharging includes:
acquiring a second current voltage of the battery after charging and discharging;
judging whether a second current voltage of the battery after charging and discharging is in a second preset range, and if the second current voltage is in the second preset range, performing a first compensation algorithm on the second current voltage to obtain a second open-circuit voltage corresponding to the second open-circuit voltage at normal temperature.
Further, the first compensation algorithm includes:
V 0 ＝V t +(T-25)/(T H -T L )×(V L -V H )；
wherein V is 0 For the compensated open circuit voltage; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the temperature at which it is currently locatedA degree; v (V) H At a temperature T for a battery H Corresponding battery voltage; v (V) L At a temperature T for a battery L Corresponding battery voltage; v (V) t Is the current voltage of the battery at the current temperature.
Further, the obtaining the updated full charge capacity according to the updated full charge capacity of the battery, the first remaining capacity and the second remaining capacity includes:
obtaining a capacity difference corresponding to the current charge and discharge through the first residual electric quantity and the second residual electric quantity, and obtaining a first capacity corresponding to the current charge and discharge at normal temperature according to a second compensation algorithm by the capacity difference;
acquiring the full charge capacity of the battery at normal temperature;
obtaining a second capacity except the current charge and discharge according to the previous updated full charge capacity, the first residual capacity, the second residual capacity and the full charge capacity of the battery at normal temperature; and taking the sum of the first capacity and the second capacity as the full charge capacity of the current update.
Further, the obtaining the second capacity other than the current charge and discharge according to the full charge capacity, the first residual capacity, the second residual capacity and the full charge capacity of the battery at the normal temperature, which are updated in the previous time, includes:
F 2 ＝F 3 ×(SOC CV -|SOC 1 -SOC 2 |)×(I'/1000)×)T'/1000)；
wherein F is 2 For a second capacity F 3 For the previous updated full charge capacity, SOC CV Full charge capacity corresponding to battery at normal temperature, SOC 1 For the first residual power, SOC 2 And I 'is a current compensation factor, and T' is a temperature compensation factor for the second residual electric quantity.
Further, the second compensation algorithm includes:
F 1 ＝F t +(T-25)/(T H -T L )×(F L -F H )；
wherein F is 1 For the compensated first capacity;T H greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; f (F) H At a temperature T for a battery H The measured battery capacity; f (F) L At a temperature T for a battery L Corresponding battery capacity; f (F) t Is the absolute value of the capacity difference between the first remaining power and the second remaining power.
In a second aspect, there is provided an apparatus for updating full charge capacity of a battery, the apparatus comprising:
the first acquisition module is used for acquiring a first open-circuit voltage of the battery before charging and discharging, and acquiring a first residual electric quantity of the battery before charging and discharging according to a residual electric quantity-open-circuit voltage relation curve and the first open-circuit voltage;
the second acquisition module is used for acquiring a second open-circuit voltage of the battery after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to the residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage;
a third obtaining module, configured to obtain a full charge capacity updated by the battery last time;
and the updating module is used for obtaining the updated full charge capacity according to the full charge capacity updated by the battery at the previous time, the first residual capacity and the second residual capacity.
In a third aspect, there is provided an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a method of updating battery full charge capacity as described above when executing the program.
In a fourth aspect, a storage medium is provided, on which a computer program is stored which, when executed by a processor, implements a method of updating a full charge capacity of a battery as described above.
In the application, the battery state of the first open circuit voltage before the measurement of charge and discharge can be any state of the battery, namely can be a full state, can be a state when a part of the electric quantity in the battery is consumed, can also be a state when the electric quantity in the battery is nearly consumed, and can obtain the first residual electric quantity of the battery before the charge and discharge according to a residual electric quantity-open circuit voltage relation curve and the first open circuit voltage after the first open circuit voltage is determined; the target state of the battery for measuring the second open circuit voltage after charging and discharging may be any state of the battery, that is, may be a full state, may be a state when a part of the electric quantity in the battery is consumed, or may be a state when the electric quantity in the battery is almost consumed, and after the second open circuit voltage is determined, obtaining the second residual electric quantity of the battery in the target state according to the residual electric quantity-open circuit voltage relation curve and the second open circuit voltage; the full charge capacity of the battery updated in the previous time is obtained before the battery is charged and discharged in the current time, and the full charge capacity of the battery updated in the current time is obtained according to the full charge capacity of the battery updated in the previous time, the first residual capacity and the second residual capacity.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method of updating a full charge capacity of a battery in accordance with a first embodiment of the present application;
fig. 2 is a flowchart of obtaining a current updated full charge capacity according to a previous updated full charge capacity, a first remaining capacity and a second remaining capacity of a battery according to a first embodiment of the present application;
fig. 3 is a flowchart of a method for updating the full charge capacity of a battery according to the first embodiment of the present application;
fig. 4 is a schematic diagram of an apparatus for updating full charge capacity of a battery according to a first embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Throughout the specification, references to "one embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples.
Example 1
As shown in fig. 1, a method for updating full charge capacity of a battery according to the present embodiment includes:
s101, acquiring a first open-circuit voltage of the battery before charging and discharging, and acquiring the first residual electric quantity of the battery before charging and discharging according to a residual electric quantity-open-circuit voltage relation curve and the first open-circuit voltage;
s102, acquiring a second open-circuit voltage after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to a residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage;
s103, acquiring the full charge capacity updated by the battery in the last time;
and S104, obtaining the updated full charge capacity according to the updated full charge capacity of the battery, the first residual capacity and the second residual capacity.
In this embodiment, the lithium ion battery is widely used in various fields such as electric vehicles, energy storage, portable electronics, etc. because of its advantages such as high energy density and long cycle life. In the using process of the battery, the charge state is an important index, namely the ratio of the actual power provided in the current state to the power provided by the fully charged battery is represented by SOC (state of charge), so that the residual power of the current state of the battery can be known, and various instructions can be conveniently sent to the battery by the battery management system. The open circuit voltage, i.e., the terminal voltage of the battery in the open circuit state, is denoted by OCV (open circuit voltage), and is generally considered to be a stable state after the battery has been left for a long time after being charged or discharged, and the voltage across the battery is the open circuit voltage at this time, which is not affected by the charge and discharge current, and is related to the battery material and the state of charge. At a certain temperature, the charge state of the battery and the open circuit voltage show a one-to-one correspondence. The SOC-OCV curve of the battery is an important reference curve of the lithium battery, and is mainly used for estimating the state of charge of the battery by adopting an open-circuit voltage method, namely, the residual electric quantity of the battery can be obtained by measuring the open-circuit voltage, and the open-circuit voltage method is generally combined with other estimation methods to jointly predict the state of charge of the battery, so that higher estimation accuracy is achieved. Obtaining the SOC-OCV curve of the battery is therefore a fundamental task in formulating a battery SOC estimation strategy.
In this embodiment, in step S101, the battery state of the first open circuit voltage before the measurement of the charge and discharge may be any state of the battery, that is, may be a full state, may be a state when a part of the electric quantity in the battery is consumed, or may be a state when the electric quantity in the battery is almost consumed, and after the first open circuit voltage is determined, the first remaining electric quantity of the battery before the charge and discharge is obtained according to the remaining electric quantity-open circuit voltage relation curve and the first open circuit voltage; in step S102, the target state of the battery for measuring the second open circuit voltage after charging and discharging may be any state of the battery, that is, may be a full state, may be a state when a part of the electric quantity in the battery is consumed, may be a state when the electric quantity in the battery is almost consumed, and after determining the second open circuit voltage, obtain the second residual electric quantity of the battery in the target state according to the residual electric quantity-open circuit voltage relation curve and the second open circuit voltage; in step S103, the full charge capacity of the battery updated last time is obtained before the current charge and discharge, in step S104, the full charge capacity of the current update is obtained according to the full charge capacity of the battery updated last time, the first residual capacity and the second residual capacity, in this embodiment, the calculation and update of the full charge capacity of the battery do not need to be fully charged, and after the full charge, the battery is fully discharged, so that the update cost of the full charge capacity of the battery is reduced, and the update efficiency is improved.
Further, the target state includes a charge-discharge state under the non-flat region of the battery, that is, the target state does not include a charge-discharge state under the flat region of the battery.
In the method for updating the full charge capacity of the battery in the embodiment, the algorithm for updating the estimated full charge capacity of the battery is realized without complete charge and discharge, preferably, the influence of the temperature on the estimated full charge capacity of the battery in the flat area is eliminated, and the battery in the charge and discharge state under the non-flat area is selected, so that the accuracy of the calculation of the full charge capacity is improved.
Further, obtaining the first open circuit voltage of the battery before charging and discharging includes:
s1011, acquiring a first current voltage of the battery before charging and discharging;
s1012, judging whether the first current voltage of the battery before charging and discharging is in a first preset range,
specifically, S1013, if the first current voltage is within a first preset range, performing a first compensation algorithm on the first current voltage to obtain a first open-circuit voltage corresponding to the first open-circuit voltage at normal temperature;
and S1014, if the first current voltage is not in the first preset range, standing the battery until the first current voltage of the battery is in the first preset range, and performing a first compensation algorithm on the first current voltage to obtain a first open-circuit voltage corresponding to the normal temperature.
The first current voltage can be obtained by directly measuring the voltage of the battery before charging and discharging by using a voltage testing instrument.
In this embodiment, it is determined whether the first current voltage is in a first preset range before charging and discharging the battery, if the first current voltage is not in the first preset range, standing is required for a period of time, and in the standing process, the first current voltage may be continuously detected until the first current voltage is in the first preset range, after the first current voltage is in the first preset range, temperature and current compensation is performed on the first current voltage to obtain a first open-circuit voltage at normal temperature, where the determination of whether the first current voltage is in the first preset range is performed by collecting the first current voltages at different time points and determining whether the rate of change of the first current voltage with time is in the first preset range, for example, the first preset range may be dV/dt is less than or equal to 4uV/s, if the rate of change of the first current voltage with time is less than or equal to 4uV/s, otherwise, continuing is required until the rate of change of the first current voltage with time is less than or equal to 4uV/s. In the embodiment of the application, the change rate of the first current voltage is defined to be in a stable state within a first preset range, and the change rate is in the first preset range, which indicates that the first current voltage is stable and is not easy to fluctuate, so that when the first current voltage is stable, the temperature and the current of the first voltage are compensated to obtain a first open-circuit voltage at normal temperature; if the first current voltage is unstable, standing for a period of time is needed until the first current voltage is stable, and at the moment, temperature and current compensation is carried out on the first current voltage to obtain a first open-circuit voltage at normal temperature.
In the present embodiment, in step S1013 and step S1014, the first compensation algorithm includes: v (V) 0 ＝V t +(T-25)/(T H -T L )×(V L -V H )；
Wherein V is 0 To be compensated forIs a voltage of an open circuit; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; v (V) H At a temperature T for a battery H Corresponding battery voltage; v (V) L At a temperature T for a battery L Corresponding battery voltage; v (V) t Is the current voltage of the battery at the current temperature.
Specifically T H T is the corresponding temperature at high temperature L The temperature is the corresponding temperature at low temperature.
Specifically, the first open circuit voltage is V 1 The first open-circuit voltage V is calculated by adopting the calculation method 1 At the time, a first open circuit voltage V 1 ＝V t1 +(T-25)/(T H -T L )×(V L -V H ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein V is t1 Is the first present voltage.
Further, obtaining the second open circuit voltage of the battery before charging and discharging includes:
s1021, obtaining a second current voltage of the battery after charging and discharging;
s1022, judging whether the second current voltage of the battery after charging and discharging is in a second preset range,
s1023, if the second current voltage is in a second preset range, performing a first compensation algorithm on the second current voltage to obtain a second open-circuit voltage corresponding to the second current voltage at normal temperature;
and S1024, if the second current voltage is not in the second preset range, standing the battery until the second current voltage of the battery is in the second preset range, and performing a first compensation algorithm on the second current voltage to obtain a second open-circuit voltage corresponding to the normal temperature.
The second current voltage can be obtained by directly measuring the voltage of the battery before charging and discharging by using a voltage testing instrument.
In this embodiment, it is determined whether the second current voltage is in a second preset range before charging and discharging the battery, if the second current voltage is not in the second preset range, standing is required for a period of time, and in the standing process, the second current voltage may be continuously detected until the second current voltage is in the second preset range, and then temperature and current compensation are performed on the second current voltage to obtain a second open circuit voltage at normal temperature, where the determination of whether the second current voltage is in the second preset range is performed by collecting the second current voltages at different time points, and determining whether the rate of change of the second current voltage over time is within the second preset range, for example, the second preset range may be dV/dt is less than or equal to 4uV/s, if the rate of change of the second current voltage over time is less than or equal to 4uV/s, then it is determined that the second current voltage is in the second preset range, otherwise, standing is required until the rate of change of the second current voltage over time is less than or equal to 4uV/s. In the embodiment of the application, the change rate of the second current voltage is defined to be in a stable state within a second preset range, and the change rate is in the second preset range, which indicates that the second current voltage is stable and is not easy to fluctuate, so that when the second current voltage is stable, the temperature and the current of the second voltage are compensated to obtain a second open-circuit voltage at normal temperature; if the second current voltage is unstable, standing for a period of time is needed until the second current voltage is stable, and at the moment, temperature and current compensation is carried out on the second current voltage to obtain a second open-circuit voltage at normal temperature.
In the present embodiment, in step S1023 and step S1024, the first compensation algorithm includes: v (V) 0 ＝V t +(T-25)/(T H -T L )×(V L -V H )；
Wherein V is 0 For the compensated open circuit voltage; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; v (V) H At a temperature T for a battery H Corresponding battery voltage; v (V) L At a temperature T for a battery L Corresponding battery voltage; v (V) t Is the current voltage of the battery at the current temperature.
Specifically, the second open circuit voltage is V 2 The second open circuit voltage V is calculated by adopting the calculation method 2 At the time, the second open circuit voltage V 2 ＝V t2 +(T-25)/(T H -T L )×(V L -V H ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein V is t2 Is the second present voltage.
Further, as shown in fig. 2, S103, obtaining the updated full charge capacity according to the previous updated full charge capacity, the first remaining capacity and the second remaining capacity of the battery includes:
s1041, obtaining a capacity difference corresponding to the current charge and discharge through the first residual electric quantity and the second residual electric quantity, and obtaining a first capacity corresponding to the current charge and discharge at normal temperature according to a second compensation algorithm by the capacity difference;
s1042, obtaining the full charge capacity of the battery at normal temperature;
s1043, obtaining a second capacity except the current charge and discharge according to the full charge capacity updated in the previous time, the first residual capacity, the second residual capacity and the full charge capacity of the battery at normal temperature;
and S1044, taking the sum of the first capacity and the second capacity as the full charge capacity updated at this time.
In this embodiment, in step S1041, the second compensation algorithm includes:
F 1 ＝F t +(T-25)/(T H -T L )×(F L -F H )；
wherein F is 1 For the compensated first capacity; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; f (F) H At a temperature T for a battery H The measured battery capacity; f (F) L At a temperature T for a battery L Corresponding battery capacity; f (F) t Is the absolute value of the capacity difference between the first remaining power and the second remaining power.
Further, in step S1043, obtaining the second capacity other than the current charge and discharge according to the full charge capacity, the first remaining capacity, the second remaining capacity, and the full charge capacity of the battery at the normal temperature, which are updated last time, includes:
F 2 ＝F 3 ×(SOC CV -|SOC 1 -SOC 2 |)×(I′/1000)×(T′/1000)；
wherein F is 2 For a second capacity F 3 For the previous updated full charge capacity, SOC CV Full charge capacity corresponding to battery at normal temperature, SOC 1 S is the first residual electric quantityOC 2 And I 'is a current compensation factor, and T' is a temperature compensation factor for the second residual electric quantity.
In this embodiment, I 'is a current compensation factor, the compensation manner is shown in table 1, where C-Rate is the ratio of current to the designed capacity of the battery, during the measurement process, the electricity meter will record the average current value AvgCurr of the previous charge and discharge, and use AvgCurr/designed capacity to obtain a corresponding C-Rate, and calculate the influence of this current on the voltage of the battery to obtain a corresponding I' in this stage, so as to obtain values of a1, a2, a3, a4, a5 corresponding to C-rates in table 1 as 0.25, 0.5, 0.75, 1, 1.25 respectively, and then, during the calculation of the second capacity, calculate the I 'by the average current value during the charge or discharge from the first residual electric quantity to the second residual electric quantity, and obtain a corresponding C-Rate, so as to obtain a corresponding I' during the charge or discharge by calculating by using a linear interpolation method.
TABLE 1
| C-Rate | 0.25 | 0.5 | 0.75 | 1 | 1.25 |
| I | a1 | a2 | a3 | a4 | a5 |
In this embodiment, T ' is a Temperature compensation factor, the compensation manner is shown in table 2, where Temperature is the ratio of the current to the designed capacity of the battery, the fuel gauge records the Temperature value of the previous charge and discharge during the measurement process, and calculates the effect of this Temperature on the voltage of the battery to obtain the corresponding T ', so as to obtain the values of T ' corresponding to the temperatures of 0 ℃, 10 ℃, 25 ℃, 40 ℃, 60 ℃ in table 2 as b1, b2, b3, b4, b5, respectively, and then when calculating the second capacity, the calculation of T ' is performed by calculating the Temperature value during the charge or discharge process from the first residual capacity to the second residual capacity, and the corresponding T ' during the charge or discharge process is obtained by adopting a linear interpolation method.
TABLE 2
| Temperature | 0 | 10 | 25 | 40 | 60 |
| T | b1 | b2 | b3 | b4 | b5 |
In a possible implementation example, as shown in fig. 3, the full charge capacity of the battery is updated in this embodiment by:
s301, reading the full charge capacity updated in the previous time;
s302, judging whether the change rate of the first current voltage of the battery before charging and discharging along with time is in a first preset range or not;
s303, if yes, performing a first compensation algorithm on the first current voltage to obtain a corresponding first open-circuit voltage at normal temperature, and obtaining a first residual capacity of the battery before charging and discharging according to a residual capacity-open-circuit voltage relation curve and the first open-circuit voltage;
s304, if not, standing the battery, and repeating the steps S302 and S303;
s305, charging or discharging the battery;
s306, judging whether the change rate of the second current voltage of the battery after charge and discharge along with time is within a second preset range;
s307, if so, performing a first compensation algorithm on the second current voltage to obtain a corresponding second open-circuit voltage at normal temperature, and obtaining a second residual capacity of the battery after charging and discharging according to a residual capacity-open-circuit voltage relation curve and the second open-circuit voltage;
s308, if not, standing the battery, and repeating the steps S306 and S307;
s309, obtaining a capacity difference corresponding to the current charge and discharge through the first residual electric quantity and the second residual electric quantity, and performing a second compensation algorithm on the capacity difference to obtain a first capacity corresponding to the current charge and discharge at normal temperature;
s310, obtaining a second capacity except the current charge and discharge according to the full charge capacity updated in the previous time, the first residual capacity, the second residual capacity and the full charge capacity of the battery at normal temperature;
and S311, taking the sum of the first capacity and the second capacity as the full charge capacity updated at this time.
The updated full charge capacity data can be stored in the electric equipment applying the battery, so that the application can be read when the full charge capacity is updated again later.
In a second aspect, as shown in fig. 4, the present embodiment provides an apparatus for updating a full charge capacity of a battery, the apparatus comprising:
the first obtaining module 401 is configured to obtain a first open-circuit voltage of the battery before charging and discharging, and obtain a first remaining capacity of the battery before charging and discharging according to a remaining capacity-open-circuit voltage relationship curve and the first open-circuit voltage;
the second obtaining module 402 is configured to obtain a second open-circuit voltage of the battery after the battery is charged and discharged to the target state, and obtain a second remaining capacity of the battery in the target state according to a remaining capacity-open-circuit voltage relationship curve and the second open-circuit voltage;
a third obtaining module 403, configured to obtain a full charge capacity updated by the battery last time;
and the updating module 404 is configured to obtain the updated full charge capacity according to the full charge capacity, the first remaining capacity and the second remaining capacity of the battery that were updated last time.
Further, the target state includes a charge-discharge state under a non-flat region of the battery.
Further, the first obtaining module 401 is further configured to obtain a first current voltage of the battery before charging and discharging; judging whether a first current voltage of the battery before charging and discharging is in a first preset range, and if the first current voltage is in the first preset range, performing a first compensation algorithm on the first current voltage to obtain a first open-circuit voltage corresponding to the first open-circuit voltage at normal temperature.
Further, the second obtaining module 402 is further configured to obtain a second current voltage of the battery after charging and discharging; judging whether a second current voltage of the battery after charging and discharging is in a second preset range, and if the second current voltage is in the second preset range, performing a first compensation algorithm on the second current voltage to obtain a second open-circuit voltage corresponding to the second open-circuit voltage at normal temperature.
Further, the first compensation algorithm includes: v (V) 0 ＝V t +(T-25)/(T H -T L )×(V L -V H )；
Wherein V is 0 For the compensated open circuit voltage; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; v (V) H At a temperature T for a battery H Corresponding battery voltage; v (V) L At a temperature T for a battery L Corresponding battery voltage; v (V) t Is the current voltage of the battery at the current temperature.
Further, the updating module 404 is further configured to obtain a capacity difference corresponding to the current charge and discharge according to the first remaining power and the second remaining power, and obtain a first capacity corresponding to the current charge and discharge at normal temperature according to the capacity difference by using a second compensation algorithm;
acquiring the full charge capacity of the battery at normal temperature;
obtaining a second capacity except the current charge and discharge according to the first residual capacity, the second residual capacity and the full charge capacity of the battery at normal temperature;
and taking the sum of the first capacity and the second capacity as the full charge capacity updated at this time.
Further, the update module 404 is further configured to:
F 2 ＝F 3 ×(SOC CV -|SOC 1 -SOC 2 |)×(I'/1000)×(T'/1000)；
wherein F is 2 For a second capacity F 3 For the previous updated full charge capacity, SOC CV Full charge capacity corresponding to battery at normal temperature, SOC 1 For the first residual power, SOC 2 And I 'is a current compensation factor, and T' is a temperature compensation factor for the second residual electric quantity.
Further, the second compensation algorithm includes:
F 1 ＝F t +(T-25)/(T H -T L )×(F L -F H ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is 1 For the compensated first capacity; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; f (F) H At a temperature T for a battery H The measured battery capacity; f (F) L At a temperature T for a battery L Corresponding battery capacity; f (F) t Is the absolute value of the capacity difference between the first remaining power and the second remaining power.
Other technical details in this embodiment refer to the first embodiment, and all the beneficial effects of the first embodiment can be achieved, which will not be described herein.
In a third aspect, the present embodiment provides an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing a method of updating a full charge capacity of a battery as in embodiment one when executing the program.
Other technical details in this embodiment refer to the first embodiment, and all the beneficial effects of the first embodiment can be achieved, which will not be described herein.
In a fourth aspect, the present embodiment provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of updating a full charge capacity of a battery as in embodiment one.
Other technical details in this embodiment refer to the first embodiment, and all the beneficial effects of the first embodiment can be achieved, which will not be described herein.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.
The foregoing has outlined some of the more detailed description of the embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, and the above examples are provided to assist in the understanding of the method and core ideas of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (11)
1. A method of updating full charge capacity of a battery, the method comprising:
acquiring a first open-circuit voltage of a battery before charging and discharging, and acquiring a first residual capacity of the battery before charging and discharging according to a residual capacity-open-circuit voltage relation curve and the first open-circuit voltage;
acquiring a second open-circuit voltage of the battery after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to the residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage;
acquiring the full charge capacity updated by the battery for the previous time;
and obtaining the updated full charge capacity according to the updated full charge capacity of the battery, the first residual capacity and the second residual capacity.
2. The method of claim 1, wherein the target state comprises a charge-discharge state under a non-flat region of the battery.
3. The method of claim 1, wherein the obtaining the first open circuit voltage of the battery prior to charging and discharging comprises:
acquiring a first current voltage of the battery before charging and discharging;
judging whether a first current voltage of the battery before charging and discharging is in a first preset range, and if the first current voltage is in the first preset range, performing a first compensation algorithm on the first current voltage to obtain a first open-circuit voltage corresponding to the first open-circuit voltage at normal temperature.
4. The method of claim 1, wherein the obtaining the second open circuit voltage of the battery prior to charging and discharging comprises:
acquiring a second current voltage of the battery after charging and discharging;
judging whether a second current voltage of the battery after charging and discharging is in a second preset range, and if the second current voltage is in the second preset range, performing a first compensation algorithm on the second current voltage to obtain a second open-circuit voltage corresponding to the second open-circuit voltage at normal temperature.
5. The method of claim 3 or 4, wherein the first compensation algorithm comprises:
V 0 ＝V t +(T-25)/(T H -T L )×(V L -V H )；
wherein V is 0 For the compensated open circuit voltage; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; v (V) H At a temperature T for a battery H Corresponding battery voltage; v (V) L At a temperature T for a battery L Corresponding battery voltage; v (V) t Is the current voltage of the battery at the current temperature.
6. The method of claim 1, wherein the obtaining the updated full charge capacity from the previous updated full charge capacity of the battery, the first remaining capacity, and the second remaining capacity comprises:
obtaining a capacity difference corresponding to the current charge and discharge through the first residual electric quantity and the second residual electric quantity, and obtaining a first capacity corresponding to the current charge and discharge at normal temperature according to a second compensation algorithm by the capacity difference;
acquiring the full charge capacity of the battery at normal temperature;
obtaining a second capacity except the current charge and discharge according to the previous updated full charge capacity, the first residual capacity, the second residual capacity and the full charge capacity of the battery at normal temperature;
and taking the sum of the first capacity and the second capacity as the full charge capacity of the current update.
7. The method of claim 6, wherein obtaining the second capacity other than the current charge and discharge based on the previously updated full charge capacity, the first remaining capacity, the second remaining capacity, and the full charge capacity of the battery at the normal temperature comprises:
F 2 ＝F 3 ×(SOC CV -|SOC 1 -SOC 2 |)×(I'/1000)×(T'/1000)；
wherein F is 2 For a second capacity F 3 For the previous updated full charge capacity, SOC CV Full charge capacity corresponding to battery at normal temperature, SOC 1 For the first residual power, SOC 2 And I 'is a current compensation factor, and T' is a temperature compensation factor for the second residual electric quantity.
8. The method of claim 6, wherein the second compensation algorithm comprises:
F 1 ＝F t +(T-25)/(T H -T L )×(F L -F H ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein F is 1 For the compensated first capacity; t (T) H Greater than T L The method comprises the steps of carrying out a first treatment on the surface of the T is the current temperature; f (F) H At a temperature T for a battery H The measured battery capacity; f (F) L At a temperature T for a battery L Corresponding battery capacity; f (F) t The capacity difference is the first residual capacity and the second residual capacity.
9. An apparatus for updating full charge capacity of a battery, the apparatus comprising:
the first acquisition module is used for acquiring a first open-circuit voltage of the battery before charging and discharging, and acquiring a first residual electric quantity of the battery before charging and discharging according to a residual electric quantity-open-circuit voltage relation curve and the first open-circuit voltage;
the second acquisition module is used for acquiring a second open-circuit voltage of the battery after the battery is charged and discharged to a target state, and acquiring a second residual electric quantity of the battery in the target state according to the residual electric quantity-open-circuit voltage relation curve and the second open-circuit voltage;
a third obtaining module, configured to obtain a full charge capacity updated by the battery last time;
and the updating module is used for obtaining the updated full charge capacity according to the full charge capacity updated by the battery at the previous time, the first residual capacity and the second residual capacity.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of updating full charge capacity of a battery as claimed in any one of claims 1 to 8 when the program is executed by the processor.
11. A storage medium having stored thereon a computer program which, when executed by a processor, implements a method of updating a full charge capacity of a battery as claimed in any one of claims 1 to 8.
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| CN202310532608.8A CN116587925A (en) | 2023-05-10 | 2023-05-10 | Method and device for updating full charge capacity of battery, electronic equipment and storage medium |
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| CN202310532608.8A CN116587925A (en) | 2023-05-10 | 2023-05-10 | Method and device for updating full charge capacity of battery, electronic equipment and storage medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362907A (en) * | 2024-06-18 | 2024-07-19 | 浙江欣旺达电子有限公司 | Battery capacity estimation method, device and electronic equipment |
| CN118465562A (en) * | 2024-07-12 | 2024-08-09 | 浙江欣旺达电子有限公司 | A method, device and terminal equipment for updating battery full charge capacity |
| CN118688656A (en) * | 2024-08-20 | 2024-09-24 | 浙江欣旺达电子有限公司 | Battery capacity updating method, system and electronic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362907A (en) * | 2024-06-18 | 2024-07-19 | 浙江欣旺达电子有限公司 | Battery capacity estimation method, device and electronic equipment |
| CN118465562A (en) * | 2024-07-12 | 2024-08-09 | 浙江欣旺达电子有限公司 | A method, device and terminal equipment for updating battery full charge capacity |
| CN118688656A (en) * | 2024-08-20 | 2024-09-24 | 浙江欣旺达电子有限公司 | Battery capacity updating method, system and electronic device |
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