CN109324292A - Calculate the method, apparatus and terminal of battery SOC - Google Patents
Calculate the method, apparatus and terminal of battery SOC Download PDFInfo
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- CN109324292A CN109324292A CN201710639478.2A CN201710639478A CN109324292A CN 109324292 A CN109324292 A CN 109324292A CN 201710639478 A CN201710639478 A CN 201710639478A CN 109324292 A CN109324292 A CN 109324292A
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Abstract
The present invention provides a kind of method, apparatus and terminal for calculating battery SOC.The described method includes: obtaining the initial SOC after booting；Obtain battery available capacity；Obtain the current coulomb integration amount from booting to current time；Current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount.The available capacity that the present invention is capable of self study update battery reduces the error that battery capacity is shown to accurately calculate battery dump energy percentage.
Description
Technical field
The present invention relates to battery capacities to calculate technical field more particularly to a kind of method, apparatus for calculating battery SOC and end
End.
Background technique
Battery is the energy core of entire electronic device, and as the application of electronic equipment is enriched constantly, user actually makes
The impression that electricity is shown is required in higher and higher, this requires to battery SOC (State Of Charge, state of charge)
Calculating it is more and more accurate.
SOC indicates battery dump energy percentage, traditional SOC estimation method generally use the method for current integration to from
The electric current flowed in or out to current time that is switched on is integrated, and obtains current coulomb integration amount, then by current coulomb integration amount
The energy for inputting or exporting from booting to current time battery is converted to, further according to the starting SOC state of battery charging and discharging
To calculate present battery residual power percentage, calculation formula is that (energy/battery that current coulomb integration amount is converted into always holds
Amount) %+ initial cells electricity percentage.Battery total capacity in formula generallys use battery nominal capacity, or uses instrument
The battery available capacity of measurement, however since the lithium battery quality of various brands and type is irregular, battery nominal capacity and reality
Often there is deviation in border total capacity, and while using the battery available capacity of apparatus measures to start accurately can always hold as battery
Amount, but after long-time use, the actually active capacity of battery can also decline with the increase of access times, so no matter adopting
Biggish accumulated error can all be had by calculating battery SOC with nominal capacity or using the battery available capacity of apparatus measures, from
And the display of battery capacity also can biggish error.
Summary of the invention
The method, apparatus and terminal provided by the invention for calculating battery SOC is capable of effective appearance of self study update battery
Amount reduces the error that battery capacity is shown to accurately calculate battery dump energy percentage.
In a first aspect, the present invention provides a kind of method for calculating battery SOC, which comprises
Initial SOC after obtaining booting；
Obtain battery available capacity；
Obtain the current coulomb integration amount from booting to current time；
Current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount.
Optionally, the acquisition battery available capacity includes:
Obtain first coulomb of integration amount from booting to battery full state；
Obtain second coulomb of integration amount of the emptying state from booting to battery；
The difference that second coulomb of integration amount subtracts first coulomb of integration amount is calculated, the difference is converted into energy
Amount, obtains battery available capacity.
Optionally, it is described obtain battery available capacity after, the method also includes:
The battery available capacity is saved in a manner of not losing after power down.
Optionally, after booting next time, the battery available capacity that obtains includes: that read the battery that is saved effective
Capacity.
Optionally, the first coulomb of integration amount obtained from booting to battery full state includes:
Judge whether battery is full of under constant-voltage charge mode；
When battery is full of, coulomb integration amount when being full of from booting to battery is recorded, as first coulomb of integration amount.
Optionally, second coulomb of integration amount for obtaining the emptying state from booting to battery includes:
Judge whether battery capacity is vented in discharge mode；
When battery capacity emptying, coulomb integration amount when being vented from booting to battery capacity is recorded, as second coulomb
Integration amount.
Optionally, described that current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount
Include:
Current SOC is calculated according to following formula:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
Second aspect, the present invention provide a kind of device for calculating battery SOC, and described device includes:
First acquisition unit, for obtaining the initial SOC after being switched on；
Second acquisition unit, for obtaining battery available capacity；
Third acquiring unit, for obtaining the current coulomb integration amount from booting to current time；
Computing unit, it is current for being calculated according to the initial SOC, battery available capacity and current coulomb integration amount
SOC。
Optionally, the second acquisition unit includes:
First obtains module, for obtaining first coulomb of integration amount from booting to battery full state；
Second obtains module, for obtaining second coulomb of integration amount of the emptying state from booting to battery；
Computing module subtracts the difference of first coulomb of integration amount for calculating second coulomb of integration amount, by the difference
Value is converted into energy, obtains battery available capacity.
Optionally, described device further include:
Storage unit, for after battery available capacity is calculated in the computing module, the battery effectively to be held
Amount is saved in a manner of not losing after power down.
Optionally, the second acquisition unit is also used to after booting next time, is read the battery saved and is effectively held
Amount.
Optionally, the first acquisition module includes:
First judging submodule, for judging whether battery is full of under constant-voltage charge mode；
First record sub module is made for when battery is full of, recording coulomb integration amount when being full of from booting to battery
For first coulomb of integration amount.
Optionally, the second acquisition module includes:
Second judgment submodule, for judging whether battery capacity is vented in discharge mode；
Second record sub module, for recording coulomb when being vented from booting to battery capacity when battery capacity emptying
Integration amount, as second coulomb of integration amount.
Optionally, the computing unit, for calculating current SOC according to following formula:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
The third aspect, the present invention provide a kind of terminal, and the terminal includes the device of above-mentioned calculating battery SOC.
The method, apparatus and terminal provided in an embodiment of the present invention for calculating battery SOC, the initial SOC after obtaining booting, is obtained
Battery available capacity is taken, the current coulomb integration amount from booting to current time is obtained, it is effective according to the initial SOC, battery
Capacity and current coulomb integration amount calculate current SOC.Compared with prior art, the present invention is capable of having for self study update battery
Capacity is imitated, to accurately calculate battery dump energy percentage, reduces the error that battery capacity is shown.
Detailed description of the invention
Fig. 1 is the flow chart for the method that one embodiment of the invention calculates battery SOC；
Fig. 2 is the flow chart for the method that another embodiment of the present invention calculates battery SOC；
Fig. 3 is the structural schematic diagram for the device that one embodiment of the invention calculates battery SOC；
Fig. 4 is the structural schematic diagram of the second acquisition unit for the device that one embodiment of the invention calculates battery SOC；
Fig. 5 is the structural schematic diagram of the first acquisition module of one embodiment of the invention second acquisition unit；
Fig. 6 is the structural schematic diagram of the second acquisition module of one embodiment of the invention second acquisition unit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of method for calculating battery SOC, as shown in Figure 1, which comprises
S11, the initial SOC after booting is obtained；
S12, battery available capacity is obtained；
The current coulomb integration amount of S13, acquisition from booting to current time；
S14, current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount.
Optionally, the acquisition battery available capacity includes:
Obtain first coulomb of integration amount from booting to battery full state；
Obtain second coulomb of integration amount of the emptying state from booting to battery；
The difference that second coulomb of integration amount subtracts first coulomb of integration amount is calculated, the difference is converted into energy
Amount, obtains battery available capacity.
Optionally, it is described obtain battery available capacity after, which comprises
The battery available capacity is saved in a manner of not losing after power down.
Optionally, after booting next time, the battery available capacity that obtains includes: that read the battery that is saved effective
Capacity.
Optionally, the first coulomb of integration amount obtained from booting to battery full state includes:
Judge whether battery is full of under constant-voltage charge mode；
When battery is full of, coulomb integration amount when being full of from booting to battery is recorded, as first coulomb of integration amount.
Optionally, described to judge whether battery is full of and include:
When charging current is less than the first preset threshold under constant-voltage charge mode, determine that the battery is full of.
Optionally, second coulomb of integration amount for obtaining the emptying state from booting to battery includes:
Judge whether battery capacity is vented in discharge mode；
When battery capacity emptying, coulomb integration amount when being vented from booting to battery capacity is recorded, as second coulomb
Integration amount.
Optionally, described to judge whether battery capacity is vented and include:
When battery open circuit voltage is less than the second preset threshold, the battery capacity emptying is determined.
Optionally, described that current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount
Include:
Current SOC is calculated according to following formula:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
The method provided in an embodiment of the present invention for calculating battery SOC, the initial SOC after obtaining booting, it is effective to obtain battery
Capacity obtains the current coulomb integration amount from booting to current time, according to the initial SOC, battery available capacity and works as
Preceding coulomb integration amount calculates current SOC.Compared with prior art, the present invention is capable of the available capacity of self study update battery, from
And battery dump energy percentage is accurately calculated, reduce the error that battery capacity is shown.
SOC indicates battery dump energy percentage, traditional SOC estimation method generally use the method for current integration to from
The electric current flowed in or out to current time that is switched on is integrated, and obtains current coulomb integration amount, then by current coulomb integration amount
The energy for inputting or exporting from booting to current time battery is converted to, further according to the starting SOC state of battery charging and discharging
To calculate present battery residual power percentage, calculation formula is that (energy/battery that current coulomb integration amount is converted into always holds
Amount) %+ initial cells electricity percentage.As can be seen from the above formula that the accuracy of battery total capacity is to present battery residue
Electricity percentage is extremely important.
Battery capacity is the fixed value of configuration in software in the prior art, and battery can generate biggish mistake after being used for a long time
Difference, self study of the present invention obtain the available capacity of battery, even if the battery capacity of configuration and the actually active capacity of battery have error,
Also can be by once learning to correct, and the battery available capacity of study is constantly updated in battery use process, it will not
Generate tired error.
As shown in Fig. 2, being carried out below specific for the flow chart of the method provided in an embodiment of the present invention for calculating battery SOC
Explanation.
(1), (2), (3), (4), (5), (6), (7), (8) are as the processing mode of the prior art in flow chart:
(1), battery capacity Battery_capacity is configured.The nominal value of battery is generally directlyed adopt, or uses instrument
The available capacity for measuring battery, will be in the nominal value of use or measured value write-in configuration file.
(2), POCV (Power up Open Circuit Voltage, power on rear battery open circuit voltage) is read.It is being switched on
General 250ms or so hardware is completed to read battery open circuit voltage afterwards, and the power consumption very little of system, can be approximately considered at this time at this time
VBAT (voltage battery, cell voltage) is exactly open-circuit voltage, and the software after kernel gets up in battery driving will be switched on
When hardware read and the POCV saved is read out.
(3), the battery capacity percentage Backup.Battery_percentage saved is read.When normal shutdown, RTC
The register of (Real Time Clock, real-time clock) can save electricity when shutdown, read saved electricity after booting next time
The initial SOC of the conduct of amount.
(4), it calculates and obtains initial quantity of electricity percentage Init.Battery_percentage.If battery is extracted, RTC
The content that register saves will disappear, it is contemplated that such case first judges whether there is the battery capacity percentage of preservation on software
Than if it does, initial SOC is equal to the battery capacity percentage saved, if it does not, just utilizing POCV and OCV (Open
Circuit Voltage, battery open circuit voltage) initial SOC is obtained according to the cell voltage electricity table of comparisons.
(5), current coulomb integration amount Fgu_capacity is read from coulomb statistic unit.System is every Fixed Time Interval
It can read the coulomb integration amount from booting to current time, the time interval of system wake-up state and dormant state is different.
(6), current battery charge percentage Current_Battery_percentage is calculated.It is read from coulomb statistic unit
After getting current coulomb integration amount, current SOC is calculated, calculation formula is (current coulomb integration amount/battery total capacity) %+
Initial cells SOC, wherein current coulomb integration amount flows in and out positive and negative.
Here, initial battery total capacity is the battery capacity Battery_capacity configured in (1), in self study meter
Battery total capacity will be updated as the calculated battery available capacity of self study after the battery available capacity of calculating.
(7), judge whether battery is full of.During the charging process, if it is constant-voltage charge mode and also charging current it is small
In a preset threshold (such as 80ma), it is possible to determine that fully charged for battery.
(8), judge whether battery capacity is vented.During electric discharge, if OCV is less than preset shutdown voltage
Threshold value (such as 3.4V) determines battery capacity emptying, 0% shutdown of report.
(A), (B), (C), (D), the specific steps that (E) is self study of the present invention update battery available capacity in flow chart:
(A), the Coulomb integral amount start_fgu_capacity of recording learning starting.After judging that battery is fully charged,
Record coulomb integration amount of the battery from booting to Full Charge Capacity.
(B), the coulomb integration amount end_fgu_capacity that recording learning terminates.After the use of various scenes,
Coulomb integration amount when battery is vented to shutdown voltage, when record battery is from booting to empty electricity.
(C), the battery available capacity learning_battery_capacity of study is calculated.Coulomb when empty electricity
The difference of Coulomb integral amount when integration amount and Full Charge Capacity is exactly the battery available capacity learnt by calculating conversion.
(D), the battery available capacity of study is saved.The battery capacity learnt is saved in the ground that will not be disappeared after power down
Side is applied and is completed in user's space such as one of linux system.
(E), after next system boot, the battery available capacity of study is first read, if preserving the available capacity of battery,
The value of battery total capacity is just using the battery available capacity of study, otherwise just with the value configured inside software.
The embodiment of the present invention also provides a kind of device for calculating battery SOC, as shown in figure 3, described device includes:
First acquisition unit 11, for obtaining the initial SOC after being switched on；
Second acquisition unit 12, for obtaining battery available capacity；
Third acquiring unit 13, for obtaining the current coulomb integration amount from booting to current time；
Computing unit 14, it is current for being calculated according to the initial SOC, battery available capacity and current coulomb integration amount
SOC。
Optionally, as shown in figure 4, the second acquisition unit 12 includes:
First obtains module 121, for obtaining first coulomb of integration amount from booting to battery full state；
Second obtains module 122, for obtaining second coulomb of integration amount of the emptying state from booting to battery；
Computing module 123 subtracts the difference of first coulomb of integration amount for calculating second coulomb of integration amount, will be described
Difference is converted into energy, obtains battery available capacity.
Optionally, described device further include:
Storage unit is effective by the battery for after battery available capacity is calculated in the computing module 123
Capacity is saved in a manner of not losing after power down.
Optionally, the second acquisition unit 12 is also used to after booting next time, it is effective to read the battery saved
Capacity.
Optionally, as shown in figure 5, the first acquisition module 121 includes:
First judging submodule 1211, for judging whether battery is full of under constant-voltage charge mode；
First record sub module 1212, coulomb integral when being full of from booting to battery for recording when battery is full of
Amount, as first coulomb of integration amount.
Optionally, first judging submodule 1211, for when under constant-voltage charge mode charging current less than first
When preset threshold, determine that the battery is full of.
Optionally, as shown in fig. 6, the second acquisition module 122 includes:
Second judgment submodule 1221, for judging whether battery capacity is vented in discharge mode；
Second record sub module 1222, for recording when being vented from booting to battery capacity when battery capacity emptying
Coulomb integration amount, as second coulomb of integration amount.
Optionally, the second judgment submodule 1221, for sentencing when battery open circuit voltage is less than the second preset threshold
The fixed battery capacity emptying.
Optionally, the computing unit 14, for calculating current SOC according to following formula:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
The device provided in an embodiment of the present invention for calculating battery SOC, the initial SOC after obtaining booting, it is effective to obtain battery
Capacity obtains the current coulomb integration amount from booting to current time, according to the initial SOC, battery available capacity and works as
Preceding coulomb integration amount calculates current SOC.Compared with prior art, the present invention is capable of the available capacity of self study update battery, from
And battery dump energy percentage is accurately calculated, reduce the error that battery capacity is shown.
The embodiment of the present invention also provides a kind of terminal, and the terminal includes the device of above-mentioned calculating battery SOC.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (15)
1. a kind of method for calculating battery SOC, which is characterized in that the described method includes:
Initial SOC after obtaining booting；
Obtain battery available capacity；
Obtain the current coulomb integration amount from booting to current time；
Current SOC is calculated according to the initial SOC, battery available capacity and current coulomb integration amount.
2. the method according to claim 1, wherein the acquisition battery available capacity includes:
Obtain first coulomb of integration amount from booting to battery full state；
Obtain second coulomb of integration amount of the emptying state from booting to battery；
The difference that second coulomb of integration amount subtracts first coulomb of integration amount is calculated, the difference is converted into energy,
Obtain battery available capacity.
3. according to the method described in claim 2, it is characterized in that, it is described obtain battery available capacity after, the method
Further include:
The battery available capacity is saved in a manner of not losing after power down.
4. according to the method described in claim 3, it is characterized in that, next time booting after, the acquisition battery available capacity packet
It includes: reading the battery available capacity saved.
5. according to the method described in claim 2, it is characterized in that, described obtain from booting to the first library of battery full state
Human relations integration amount includes:
Judge whether battery is full of under constant-voltage charge mode；
When battery is full of, coulomb integration amount when being full of from booting to battery is recorded, as first coulomb of integration amount.
6. according to the method described in claim 2, it is characterized in that, second library for obtaining the emptying state from booting to battery
Human relations integration amount includes:
Judge whether battery capacity is vented in discharge mode；
When battery capacity emptying, coulomb integration amount when being vented from booting to battery capacity is recorded, is integrated as second coulomb
Amount.
7. the method according to claim 1, wherein it is described according to the initial SOC, battery available capacity and
Current coulomb integration amount calculates current SOC
Current SOC is calculated according to following formula:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
8. a kind of device for calculating battery SOC, which is characterized in that described device includes:
First acquisition unit, for obtaining the initial SOC after being switched on；
Second acquisition unit, for obtaining battery available capacity；
Third acquiring unit, for obtaining the current coulomb integration amount from booting to current time；
Computing unit, for calculating current SOC according to the initial SOC, battery available capacity and current coulomb integration amount.
9. device according to claim 8, which is characterized in that the second acquisition unit includes:
First obtains module, for obtaining first coulomb of integration amount from booting to battery full state；
Second obtains module, for obtaining second coulomb of integration amount of the emptying state from booting to battery；
Computing module subtracts the difference of first coulomb of integration amount for calculating second coulomb of integration amount, and the difference is turned
It changes energy into, obtains battery available capacity.
10. device according to claim 9, which is characterized in that described device further include:
Storage unit, for after battery available capacity is calculated in the computing module, by the battery available capacity with
The mode that do not lose after power down is saved.
11. device according to claim 10, which is characterized in that the second acquisition unit is also used to be switched in next time
Afterwards, the battery available capacity saved is read.
12. device according to claim 9, which is characterized in that described first, which obtains module, includes:
First judging submodule, for judging whether battery is full of under constant-voltage charge mode；
First record sub module records coulomb integration amount when being full of from booting to battery for when battery is full of, as the
One coulomb of integration amount.
13. device according to claim 9, which is characterized in that described second, which obtains module, includes:
Second judgment submodule, for judging whether battery capacity is vented in discharge mode；
Second record sub module, for when battery capacity emptying, recording coulomb integral when being vented from booting to battery capacity
Amount, as second coulomb of integration amount.
14. device according to claim 8, which is characterized in that the computing unit, for working as according to the calculating of following formula
Preceding SOC:
Current SOC=(energy that current coulomb integration amount is converted into/battery available capacity) initial SOC of %+.
15. a kind of terminal, which is characterized in that the terminal includes the calculating battery as described in any one of claim 8 to 14
The device of SOC.
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