CN105548905A - Method and system for testing battery electricity quantity - Google Patents
Method and system for testing battery electricity quantity Download PDFInfo
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- CN105548905A CN105548905A CN201610016646.8A CN201610016646A CN105548905A CN 105548905 A CN105548905 A CN 105548905A CN 201610016646 A CN201610016646 A CN 201610016646A CN 105548905 A CN105548905 A CN 105548905A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
Abstract
The invention discloses a method and system for testing battery electricity quantity. The method comprises following steps: battery load current is calculated according to obtained battery internal resistance and battery load voltage; electricity quantity loss or increment is calculated according to the battery load current; initial battery electricity quantity is obtained according to obtained battery no-load voltage; current battery electricity quantity is calculated according to the battery total electricity quantity, the initial battery electricity quantity, and the electricity quantity loss or increment. By use of the method, discharge test is performed to batteries of the same kind to obtain relative parameters such as battery internal resistance, battery load voltage, battery no-load voltage, battery total electricity quantity, and initial battery quantity, of the batteries, and then a series of mathematical operations are performed to obtain the current battery electricity quantity. As a result, coulometer modules specially installed for measuring battery electricity quantity are saved so that the cost of mobile terminals or electronic devices is greatly reduced and therefore the method and system have stronger market competitiveness.
Description
Technical field
The present invention relates to electricity field, particularly relate to a kind of method of testing and system of battery electric quantity.
Background technology
At portable electronic device as in mobile phone, how many in order to allow user can understand the electricity of electronic equipment in real time, current existing design proposal is with hardware battery electric quantity coulombmeter module, and mobile phone only needs to read corresponding register interface, can obtain the current charge value consumed of battery.
Although this kind of mode can reach the effect accurately measured, but its cost is relatively costly.In the design proposal of low cost, unspecial electricity coulombmeter module.How designing low cost and the method for testing of the battery electric quantity of pinpoint accuracy, is the problem that this area needs solution badly.
Summary of the invention
The object of this invention is to provide method of testing and the system of the battery electric quantity that a kind of cost is lower, degree of accuracy is higher.
The object of the invention is to be achieved through the following technical solutions:
A method of testing for battery electric quantity, described method comprises:
Calculate battery load current according to the internal resistance of cell obtained and cell load voltage, calculate loss of electricity according to battery load current or increase electricity;
Battery no-load voltage according to obtaining obtains initial cells electricity;
According to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
Preferably, described method comprises: calculate battery load current at the described internal resistance of cell according to acquisition and cell load voltage, before calculating loss of electricity according to battery load current or increasing the step of electricity: test according to battery discharge, obtain the cell load voltage under different temperatures and the total electricity of battery, and the corresponding relation accordingly between battery no-load voltage, the internal resistance of cell, initial cells electricity three;
The described internal resistance of cell according to acquisition and cell load voltage calculate battery load current, the step calculating loss of electricity or increase electricity according to battery load current comprises: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculates loss of electricity or increase electricity according to battery load current;
The step that the described battery no-load voltage according to obtaining obtains initial cells electricity comprises: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
The described total electricity of battery according to acquisition, initial cells electricity and described loss of electricity or increase electricity, the step calculating current battery charge comprises: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
Preferably, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
Preferably, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.
Preferably, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
The present invention also discloses a kind of test macro of battery electric quantity, and described system comprises:
Load current processing module, for calculating battery load current according to the internal resistance of cell obtained and cell load voltage, calculating loss of electricity according to battery load current or increasing electricity;
Initial quantity of electricity processing module, for obtaining initial cells electricity according to the battery no-load voltage obtained;
Current electric quantity processing module, for according to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculates current battery charge.
Preferably, described system comprises acquisition module, described acquisition module is used for, according to battery discharge test, obtaining the cell load voltage under different temperatures and the total electricity of battery, and the corresponding relation accordingly between battery no-load voltage, the internal resistance of cell, initial cells electricity three;
Described load current processing module also for: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculate loss of electricity according to battery load current or increase electricity;
Described initial quantity of electricity processing module also for: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
Described current electric quantity processing module also for: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
Preferably, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
Preferably, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.
Preferably, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
Compared to existing technology, the present invention has the following advantages: in prior art, how many in order to allow user can understand the electricity of electronic equipment in real time, utilize battery electric quantity coulombmeter module to measure battery, mobile phone only needs to read corresponding register interface, can obtain the current charge value consumed of battery, but the cost intensive of coulombmeter module, in some cheap schemes or product, consider Cost Problems, coulombmeter module cannot be used.And in order to arrive the object measuring battery electric quantity, in the present invention, the method for testing of disclosed a kind of battery electric quantity, the method comprises, calculate battery load current according to the internal resistance of cell obtained and cell load voltage, calculate loss of electricity according to battery load current or increase electricity; Battery no-load voltage according to obtaining obtains initial cells electricity; According to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.Adopt in this way, only need same class battery just discharge test, obtain the correlation parameter of battery, as parameters such as the internal resistance of cell, cell load voltage, battery no-load voltage, the total electricity of battery, initial cells electricity, then a series of computing is carried out, just current battery charge can be obtained, certainly, under different temperatures, the parameter of battery is different, so need the battery parameter under test different temperatures, when calculating current battery charge, also the parameter can chosen under relevant temperature calculates, and the result obtained also can be more accurate.Like this, just do not need the coulombmeter module that test battery electricity is set specially, thus greatly reduce the cost of mobile terminal or electronic equipment, make it to have more the market competitiveness.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for testing of the battery electric quantity of the embodiment of the present invention one;
Fig. 2 is the process flow diagram of the method for testing of the battery electric quantity of the embodiment of the present invention two;
Fig. 3 is the schematic diagram of the test macro of the battery electric quantity of the embodiment of the present invention three;
Fig. 4 is the schematic diagram of the test macro of the battery electric quantity of the another kind of mode of the embodiment of the present invention three.
Wherein: 200, acquisition module, 201, load current processing module, 202, initial quantity of electricity processing module, 203, current electric quantity processing module.
Embodiment
Before in further detail exemplary embodiment being discussed, it should be mentioned that some exemplary embodiments are described as the process or method described as process flow diagram.Although operations is described as the process of order by process flow diagram, many operations wherein can be implemented concurrently, concomitantly or simultaneously.In addition, the order of operations can be rearranged.Described process can be terminated when its operations are completed, but can also have the additional step do not comprised in the accompanying drawings.Described process can correspond to method, function, code, subroutine, subroutine etc.
Within a context alleged " computer equipment ", also referred to as " computer ", refer to the intelligent electronic device that can be performed the predetermined process such as numerical evaluation and/or logical calculated process by operation preset program or instruction, it can comprise processor and storer, the survival instruction that prestores in memory is performed to perform predetermined process process by processor, or perform predetermined process process by the hardware such as ASIC, FPGA, DSP, or combined by said two devices and realize.Computer equipment includes but not limited to server, PC, notebook computer, panel computer, smart mobile phone etc.
Described computer equipment comprises subscriber equipment and the network equipment.Wherein, described subscriber equipment or client include but not limited to computer, smart mobile phone, PDA etc.; The described network equipment includes but not limited to the server group that single network server, multiple webserver form or the cloud be made up of a large amount of computing machine or the webserver based on cloud computing (CloudComputing), wherein, cloud computing is the one of Distributed Calculation, the super virtual machine be made up of a group loosely-coupled computing machine collection.Wherein, described computer equipment isolated operation can realize the present invention, also accessible network by realizing the present invention with the interactive operation of other computer equipments in network.Wherein, the network residing for described computer equipment includes but not limited to internet, wide area network, Metropolitan Area Network (MAN), LAN (Local Area Network), VPN etc.
It should be noted that; described subscriber equipment, client, the network equipment and network etc. are only citing; other computer equipments that are existing or that may occur from now on or network, as being applicable to the present invention, within also should being included in scope, and are contained in this with way of reference.
Method (some of them are illustrated by process flow diagram) discussed below can be implemented by hardware, software, firmware, middleware, microcode, hardware description language or its combination in any.When implementing by software, firmware, middleware or microcode, program code or code segment in order to implement necessary task can be stored in machine or computer-readable medium (such as storage medium).(one or more) processor can implement necessary task.
Concrete structure disclosed herein and function detail are only representational, and are the objects for describing exemplary embodiment of the present invention.But the present invention can carry out specific implementation by many replacement forms, and should not be construed as only being limited to the embodiments set forth herein.
Should be understood that, although may have been used term " first ", " second " etc. here to describe unit, these unit should not limit by these terms.These terms are used to be only used to a unit and another unit to distinguish.For example, when not deviating from the scope of exemplary embodiment, first module can be called as second unit, and second unit can be called as first module similarly.Here used term "and/or" comprise one of them or more any and all combinations of listed associated item.
Should be understood that, when a unit is called as " connection " or " coupling " to another unit, it can directly connect or be coupled to another unit described, or can there is temporary location.On the other hand, " when being directly connected " or " directly coupled " to another unit, then there is not temporary location when a unit is called as.Should explain in a comparable manner the relation be used between description unit other words (such as " and be in ... between " compared to " and be directly in ... between ", " with ... contiguous " compared to " and with ... be directly close to " etc.).
Here used term is only used to describe specific embodiment and be not intended to limit exemplary embodiment.Unless context refers else clearly, otherwise singulative used here " ", " one " are also intended to comprise plural number.It is to be further understood that, the existence of the feature that term used here " comprises " and/or " comprising " specifies to state, integer, step, operation, unit and/or assembly, and do not get rid of and there is or add other features one or more, integer, step, operation, unit, assembly and/or its combination.
Also it should be mentioned that and to replace in implementation at some, the function/action mentioned can according to being different from occurring in sequence of indicating in accompanying drawing.For example, depend on involved function/action, in fact the two width figure in succession illustrated can perform simultaneously or sometimes can perform according to contrary order substantially.
Below in conjunction with accompanying drawing and preferred embodiment, the invention will be further described.
Wherein, the method for the present embodiment realizes mainly through mobile terminal or electronic equipment; Mobile terminal or electronic equipment, as mobile phone, flat board etc., also can have network function, can carry out communication be connected with other-end, but and are limited to above-mentioned several.
It should be noted that, mobile terminal or electronic equipment are only citing, and other network equipments that are existing or that may occur from now on and client, as being applicable to the present invention, within also should being included in scope, and are contained in this with way of reference.In addition, the embodiment in the present invention is only and illustrates, can independent assortment between embodiment and embodiment, also can combine, as long as can realize the effect in the present invention between multiple embodiment.
Embodiment one
As shown in Figure 1, disclose a kind of method of testing of battery electric quantity in the present embodiment, described method comprises:
S101, calculates battery load current according to the internal resistance of cell obtained and cell load voltage, calculates loss of electricity or increase electricity according to battery load current;
S102, the battery no-load voltage according to obtaining obtains initial cells electricity;
S103, according to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculates current battery charge.
Adopt in this way, only need same class battery just discharge test, obtain the correlation parameter of battery, as parameters such as the internal resistance of cell, cell load voltage, battery no-load voltage, the total electricity of battery, initial cells electricity, then a series of computing is carried out, just current battery charge can be obtained, certainly, under different temperatures, the parameter of battery is different, so need the battery parameter under test different temperatures, when calculating current battery charge, also the parameter can chosen under relevant temperature calculates, and the result obtained also can be more accurate.Like this, just do not need the coulombmeter module that test battery electricity is set specially, thus greatly reduce the cost of mobile terminal or electronic equipment, make it to have more the market competitiveness.
According to an example, described method comprises: calculate battery load current at the described internal resistance of cell according to acquisition and cell load voltage, before calculating loss of electricity according to battery load current or increasing the step of electricity S101: test according to battery discharge, obtain the cell load voltage under different temperatures and the total electricity of battery, and corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three;
The described internal resistance of cell according to acquisition and cell load voltage calculate battery load current, the step calculating loss of electricity or increase electricity S101 according to battery load current comprises: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculates loss of electricity or increase electricity according to battery load current;
The step that the described battery no-load voltage according to obtaining obtains initial cells electricity S102 comprises: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
The described total electricity of battery according to acquisition, initial cells electricity and described loss of electricity or increase electricity, the step calculating current battery charge S103 comprises: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
Because battery parameter is at different temperatures different, the relation of the internal resistance of battery, capacity and no-load voltage, can change with variation with temperature, so need to test at different temperature, when calculating battery electric quantity, also need to calculate according to current temperature Selecting All Parameters, the result calculated so also can be more accurate.In the present embodiment, need the corresponding battery no-load voltage at making 5 temperature, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, 5 temperature are-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C respectively.When calculating battery electric quantity, according to Current Temperatures, in conjunction with the corresponding battery no-load voltage at above-mentioned 5 temperature, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T under adopting the method for linear interpolation to calculate corresponding temperature
ocv-r-c) corresponding relation between three.Current Temperatures, lower than-20 DEG C, directly adopts corresponding battery no-load voltage, the internal resistance of cell, the initial cells electricity (T of-20 DEG C
ocv-r-c) corresponding relation between three; Current Temperatures, higher than 50 DEG C, directly adopts corresponding battery no-load voltage, the internal resistance of cell, the initial cells electricity (T of 50 DEG C
ocv-r-c) corresponding relation between three; When Current Temperatures is between-20 DEG C to-10 DEG C, the corresponding battery no-load voltage of-10 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between-10 DEG C to 0 DEG C, the corresponding battery no-load voltage of 0 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between 0 DEG C to 25 DEG C, the corresponding battery no-load voltage of 25 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between 25 DEG C to 50 DEG C, the corresponding battery no-load voltage of 50 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three.
More concrete, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
When electronic equipment is in discharge mode, Vocv is more than or equal to Vbat, thus Ibat be 0 or on the occasion of.
When electronic equipment is in charge mode, Vocv is less than or equal to Vbat, so Ibat is 0 or negative value.
In addition, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.As I
batfor on the occasion of, Δ C is just then; As I
batfor negative value, Δ C is then negative.
In addition, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
When equipment works in discharge mode, Δ C is just, C
curfor reducing trend.
When equipment works in charge mode, Δ C is negative, C
curfor increasing trend.
In the present embodiment, wherein Current Temperatures t obtains by the temperature measuring equipment measurement of electronic equipment.The wherein start no-load voltage V of battery
ocv-initcan be obtained by the no-load voltage measurement mechanism measurement of electronic equipment.The wherein current no-load voltage V of battery
ocv, can by last computation electricity number percent C out
cur, inquire about corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation Selecting All Parameters between three obtains.Wherein present battery load voltage V
batload voltage measurement mechanism measurement by electronic equipment obtains.
In the present embodiment, battery electric quantity number percent C when wherein starting shooting
init, by start no-load voltage V
ocv-initthe corresponding relation inquired about between corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity three obtains.As battery capacity indication on the UI interface being directly presented at electronic equipment after starting shooting, and the parameter of subsequent calculations electricity number percent.
Wherein, according to the test at a certain temperature in the present embodiment, obtain following corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) correspondence table between three:
Table 1 (25 DEG C)
| No-load voltage (unit: mV) | Internal resistance (unit: m Ω) | Number percent (%) |
| 4286.6 | 375.8 | 2.083333333 |
| 4258.1 | 375.8 | 4.166666667 |
| 4233 | 376.4 | 6.25 |
| 4208.8 | 377.6 | 8.333333333 |
| 4185.8 | 379.4 | 10.41666667 |
| 4163.2 | 382 | 12.5 |
| 4141.2 | 385 | 14.58333333 |
| 4119.5 | 387.6 | 16.66666667 |
| 4098.1 | 391.2 | 18.75 |
| 4077.6 | 394.8 | 20.83333333 |
| 4062.5 | 400 | 22.91666667 |
| 4041.7 | 403 | 25 |
| 4013.5 | 404.4 | 27.08333333 |
| 3991.1 | 406 | 29.16666667 |
| 3975 | 408 | 31.25 |
| 3961.7 | 409.8 | 33.33333333 |
| 3944.6 | 406 | 35.41666667 |
| 3926 | 401.8 | 37.5 |
| 3906.8 | 396.2 | 39.58333333 |
| 3888.5 | 391.2 | 41.66666667 |
| 3872.1 | 387.6 | 43.75 |
| 3857.8 | 385.6 | 45.83333333 |
| 3845.1 | 385 | 47.91666667 |
| … | … | … |
| 3632.1 | 545 | 97.91666667 |
| 3522.7 | 602.6 | 100 |
Table 2 (25 DEG C):
| No-load voltage (unit: mV) | Internal resistance (unit: m Ω) | Number percent (%) |
| 4288.5 | 138.2 | 2.083333333 |
| 4264.8 | 178.1 | 4.166666667 |
| 4236.6 | 163.4 | 6.25 |
| 4208.1 | 165.6 | 8.333333333 |
| 4186.9 | 165 | 10.41666667 |
| 4166.7 | 163.8 | 12.5 |
| 4148.6 | 158.2 | 14.58333333 |
| 4117 | 155 | 16.66666667 |
| 4100.6 | 153.6 | 18.75 |
| 4078.5 | 153.2 | 20.83333333 |
| 4065 | 155.8 | 22.91666667 |
| 4040.8 | 155.8 | 25 |
| 4015.5 | 158.6 | 27.08333333 |
| 3993 | 163.4 | 29.16666667 |
| 3984.6 | 165.8 | 31.25 |
| 3962.4 | 168 | 33.33333333 |
| 3945.7 | 160.3 | 35.41666667 |
| 3930 | 178.2 | 37.5 |
| 3908.8 | 203.4 | 39.58333333 |
| 3886.4 | 200.8 | 41.66666667 |
| 3873.8 | 185 | 43.75 |
| 3856.2 | 173.5 | 45.83333333 |
| 3846.8 | 168.6 | 47.91666667 |
| … | ... | … |
| 3638.2 | 348.8 | 97.5 |
| 3525.8 | 465.6 | 100 |
Table 3 (50 DEG C):
Below in conjunction with the scheme of the more detailed description the present embodiment of table 1.
According to principle, there is following relation with the load current flowing through battery in battery electric quantity (mAh, MAH):
wherein, C: battery electric quantity; I: the load current flowing through battery, in units of mA; Dt: time period, in seconds.
For electric discharge, by the no-load voltage of battery, load voltage and internal resistance, can calculate the load current of battery, Current versus time carries out the electricity that integration can have been consumed, deduct the electricity consumed with the initial quantity of electricity of battery, current battery electric quantity can be obtained.During charging, battery electric quantity increases algorithm by that analogy.
The acquisition of known parameters in the present embodiment:
1), cell load voltage: obtain by sampling battery voltage sensor ends ADC.
2), initial idle voltage: obtain by access CPU register interface.
3), battery total capacity: battery nominal capacity.
4) corresponding relation, between corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity three:
For certain a set battery, under same temperature, battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, this relation can obtain through discharge measuring, as shown in Table 1 above.
In the present embodiment, concrete calculating implementation is as follows:
1), to be tabled look-up by table 1 by initial idle voltage and obtain initial cells electricity percent value C
0;
2), to be tabled look-up by table 1 by initial idle voltage and obtain internal resistance of cell R
int.Calculate battery load current as follows:
I＝(V
ocv-V
bat)/R
int
Wherein, V
ocv: initial idle voltage; V
bat: load voltage; I: battery load current; R
int: the internal resistance of cell.
3) be, by 10 seconds an integration period, wait for 10 seconds
4) consumes power C, is calculated in an integration period
1, C
1=I*T/3600, wherein, T: integration period is now 10 seconds;
5), current electric quantity number percent C is calculated, C=C
0-(C
1/ C
max* 100%), wherein, Cmax: battery total capacity.
Therefore, current electric quantity number percent C is calculated according to said process.
In addition, calculating current press electricity number percent after, the calculating conveniently, can calculate after, using the result of calculation of C as new C
0store, then, by new C
0obtain current no-load voltage, namely use new C
0table look-up by table 1 and obtain current no-load voltage value, then continue to calculate according to above-mentioned steps.
Embodiment two
The present embodiment is describing in further detail, shown in composition graphs 2 current electric quantity calculating in embodiment.
Step one: according to the Current Temperatures t collected, and battery no-load voltage, the internal resistance of cell, the initial cells electricity (T at 5 temperature (-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C)
ocv-r-c) corresponding relation between three, adopt the method dynamic calculation of linear interpolation to go out battery no-load voltage, the internal resistance of cell, the initial cells electricity (T of corresponding Current Temperatures
ocv-r-c) corresponding relation between three.Simultaneously according to the Current Temperatures collected, and the battery total capacity C at 5 temperature (-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C)
max (t), the battery total capacity C of corresponding Current Temperatures is gone out by the method dynamic calculation of linear interpolation
max.
Step 2: according to the battery start no-load voltage V collected
ocv-initenquiry form T
ocv-r-cobtain battery electric quantity number percent C when starting shooting
init.
Step 3: according to battery no-load voltage V
ocv(when the first run of test after start is run, V
ocvreplace with the start no-load voltage V of battery
ocv-init), enquiry form T
ocv-r-cobtain internal resistance of cell R now
bat, and combine the cell load voltage V collected
bat, calculate battery load current I
bat, formula is as follows:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
Step 4: be an integration period with 10 seconds, therefore time delay carried out step 5 after 10 seconds.
Step 5: by battery load current I
batbe scaled electricity Δ C ' as follows:
wherein, Δ C ' is electricity, I
batfor battery load current.
Δ C ' be added to loss of electricity or increase in electricity Δ C.
Step 6: according to start electricity C
init, loss of electricity or increase electricity Δ C, current battery charge C
maxvalue, calculate current electric quantity number percent C as follows
cur:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
Step 7: according to the Current Temperatures collected, and battery no-load voltage, the internal resistance of cell, the initial cells electricity (T at 5 temperature (-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C)
ocv-r-c) corresponding relation between three, adopt the method dynamic calculation of linear interpolation to go out the T of corresponding Current Temperatures t
ocv-r-c.Simultaneously according to the Current Temperatures t collected, and the battery total capacity C at 5 temperature (-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C)
max (t), the C of corresponding Current Temperatures t is gone out by the method dynamic calculation of linear interpolation
max.
Step 8: according to current electric quantity number percent C
curvalue, enquiry form T
ocv-r-c obtains present battery no-load voltage V
ocv.
In step 6, just calculate the number percent of current electric quantity, as the battery capacity indication of UI display interface.
After step 8, step 3 can be returned and carry out next round computing.
In the present embodiment, be an integration period with 10 seconds in step 4, also can using other times as an integration period, such as 5 seconds, 8 seconds, 11 seconds, 12 seconds etc., can calculate, be the concrete mode in this embodiment for 10 seconds, do not limit.
Embodiment three
As shown in Figure 3, the present embodiment discloses a kind of test macro of battery electric quantity, and described system comprises:
Load current processing module 201, for calculating battery load current according to the internal resistance of cell obtained and cell load voltage, calculating loss of electricity according to battery load current or increasing electricity;
Initial quantity of electricity processing module 202, for obtaining initial cells electricity according to the battery no-load voltage obtained;
Current electric quantity processing module 203, for according to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculates current battery charge.
Adopt in this way, only need same class battery just discharge test, obtain the correlation parameter of battery, as parameters such as the internal resistance of cell, cell load voltage, battery no-load voltage, the total electricity of battery, initial cells electricity, then a series of computing is carried out, just current battery charge can be obtained, certainly, under different temperatures, the parameter of battery is different, so need the battery parameter under test different temperatures, when calculating current battery charge, also the parameter can chosen under relevant temperature calculates, and the result obtained also can be more accurate.Like this, just do not need the coulombmeter module that test battery electricity is set specially, thus greatly reduce the cost of mobile terminal or electronic equipment, make it to have more the market competitiveness.
According to an example, as shown in Figure 4, described system comprises acquisition module 200, described acquisition module 200 is for testing according to battery discharge, obtain the cell load voltage under different temperatures and the total electricity of battery, and the corresponding relation accordingly between battery no-load voltage, the internal resistance of cell, initial cells electricity three;
Described load current processing module 201 also for: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculate loss of electricity according to battery load current or increase electricity;
Described initial quantity of electricity processing module 202 also for: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
Described current electric quantity processing module 203 also for: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
Because battery parameter is at different temperatures different, the relation of the internal resistance of battery, capacity and no-load voltage, can change with variation with temperature, so need to test at different temperature, when calculating battery electric quantity, also need to calculate according to current temperature Selecting All Parameters, the result calculated so also can be more accurate.In the present embodiment, need the corresponding battery no-load voltage at making 5 temperature, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, 5 temperature are-20 DEG C ,-10 DEG C, 0 DEG C, 25 DEG C, 50 DEG C respectively.When calculating battery electric quantity, according to Current Temperatures, in conjunction with the corresponding battery no-load voltage at above-mentioned 5 temperature, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T under adopting the method for linear interpolation to calculate corresponding temperature
ocv-r-c) corresponding relation between three.Current Temperatures, lower than-20 DEG C, directly adopts corresponding battery no-load voltage, the internal resistance of cell, the initial cells electricity (T of-20 DEG C
ocv-r-c) corresponding relation between three; Current Temperatures, higher than 50 DEG C, directly adopts corresponding battery no-load voltage, the internal resistance of cell, the initial cells electricity (T of 50 DEG C
ocv-r-c) corresponding relation between three; When Current Temperatures is between-20 DEG C to-10 DEG C, the corresponding battery no-load voltage of-10 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between-10 DEG C to 0 DEG C, the corresponding battery no-load voltage of 0 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between 0 DEG C to 25 DEG C, the corresponding battery no-load voltage of 25 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three; When Current Temperatures is between 25 DEG C to 50 DEG C, the corresponding battery no-load voltage of 50 DEG C, the internal resistance of cell, initial cells electricity (T can be adopted
ocv-r-c) corresponding relation Selecting All Parameters between three.
More concrete, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
When electronic equipment is in discharge mode, Vocv is more than or equal to Vbat, thus Ibat be 0 or on the occasion of.
When electronic equipment is in charge mode, Vocv is less than or equal to Vbat, so Ibat is 0 or negative value.
In addition, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.As I
batfor on the occasion of, Δ C is just then; As I
batfor negative value, Δ C is then negative.
In addition, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
When equipment works in discharge mode, Δ C is just, C
curfor reducing trend.
When equipment works in charge mode, Δ C is negative, C
curfor increasing trend.
In the present embodiment, wherein Current Temperatures t obtains by the temperature measuring equipment measurement of electronic equipment.The wherein start no-load voltage V of battery
ocv-initcan be obtained by the no-load voltage measurement mechanism measurement of electronic equipment.The wherein current no-load voltage V of battery
ocv, can by last computation electricity number percent C out
cur, inquire about corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation Selecting All Parameters between three obtains.Wherein present battery load voltage V
batload voltage measurement mechanism measurement by electronic equipment obtains.
In the present embodiment, battery electric quantity number percent C when wherein starting shooting
init, by start no-load voltage V
ocv-initthe corresponding relation inquired about between corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity three obtains.As battery capacity indication on the UI interface being directly presented at electronic equipment after starting shooting, and the parameter of subsequent calculations electricity number percent.
Wherein, according to the test at a certain temperature in the present embodiment, obtain following corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) correspondence table between three:
Table 1 (0 DEG C):
Table 2 (25 DEG C):
Table 3 (50 DEG C):
Below in conjunction with the scheme of the more detailed description the present embodiment of table 1.
According to principle, there is following relation with the load current flowing through battery in battery electric quantity (mAh, MAH):
wherein, C: battery electric quantity; I: the load current flowing through battery, in units of mA; Dt: time period, in seconds.
For electric discharge, by the no-load voltage of battery, load voltage and internal resistance, can calculate the load current of battery, Current versus time carries out the electricity that integration can have been consumed, deduct the electricity consumed with the initial quantity of electricity of battery, current battery electric quantity can be obtained.During charging, battery electric quantity increases algorithm by that analogy.
The acquisition of known parameters in the present embodiment:
1), cell load voltage: obtain by sampling battery voltage sensor ends ADC.
2), initial idle voltage: obtain by access CPU register interface.
3), battery total capacity: battery nominal capacity.
4) corresponding relation, between corresponding battery no-load voltage, the internal resistance of cell, initial cells electricity three:
For certain a set battery, under same temperature, battery no-load voltage, the internal resistance of cell, initial cells electricity (T
ocv-r-c) corresponding relation between three, this relation can obtain through discharge measuring, as shown in Table 1 above.
In the present embodiment, concrete calculating implementation is as follows:
1), to be tabled look-up by table 1 by initial idle voltage and obtain initial cells electricity percent value C
0;
2), to be tabled look-up by table 1 by initial idle voltage and obtain internal resistance of cell R
int.Calculate battery load current as follows:
I＝(V
ocv-V
bat)/R
int
Wherein, V
ocv: initial idle voltage; V
bat: load voltage; I: battery load current; R
int: the internal resistance of cell.
3) be, by 10 seconds an integration period, wait for 10 seconds
4) consumes power C, is calculated in an integration period
1, C
1=I*T/3600, wherein, T: integration period is now 10 seconds;
5), current electric quantity number percent C is calculated, C=C
0-(C
1/ C
max* 100%), wherein, Cmax: battery total capacity.
Therefore, current electric quantity number percent C is calculated according to said process.
In addition, calculating current press electricity number percent after, the calculating conveniently, can calculate after, using the result of calculation of C as new C
0store, then, by new C
0obtain current no-load voltage, namely use new C
0table look-up by table 1 and obtain current no-load voltage value, then continue to calculate according to above-mentioned steps.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a method of testing for battery electric quantity, is characterized in that, described method comprises:
Calculate battery load current according to the internal resistance of cell obtained and cell load voltage, calculate loss of electricity according to battery load current or increase electricity;
Battery no-load voltage according to obtaining obtains initial cells electricity;
According to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
2. the method for testing of a kind of battery electric quantity according to claim 1, it is characterized in that, described method comprises: calculate battery load current at the described internal resistance of cell according to acquisition and cell load voltage, before calculating loss of electricity according to battery load current or increasing the step of electricity: test according to battery discharge, obtain the cell load voltage under different temperatures and the total electricity of battery, and the corresponding relation accordingly between battery no-load voltage, the internal resistance of cell, initial cells electricity three;
The described internal resistance of cell according to acquisition and cell load voltage calculate battery load current, the step calculating loss of electricity or increase electricity according to battery load current comprises: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculates loss of electricity or increase electricity according to battery load current;
The step that the described battery no-load voltage according to obtaining obtains initial cells electricity comprises: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
The described total electricity of battery according to acquisition, initial cells electricity and described loss of electricity or increase electricity, the step calculating current battery charge comprises: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
3. the method for testing of a kind of battery electric quantity according to claim 1, is characterized in that, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
4. the method for testing of a kind of battery electric quantity according to claim 1, is characterized in that, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.
5. the method for testing of a kind of battery electric quantity according to claim 1, is characterized in that, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
6. a test macro for battery electric quantity, is characterized in that, described system comprises:
Load current processing module, for calculating battery load current according to the internal resistance of cell obtained and cell load voltage, calculating loss of electricity according to battery load current or increasing electricity;
Initial quantity of electricity processing module, for obtaining initial cells electricity according to the battery no-load voltage obtained;
Current electric quantity processing module, for according to the total electricity of battery obtained, described initial cells electricity and described loss of electricity or increase electricity, calculates current battery charge.
7. the test macro of a kind of battery electric quantity according to claim 6, it is characterized in that, described system comprises acquisition module, described acquisition module is used for testing according to battery discharge, obtain the cell load voltage under different temperatures and the total electricity of battery, and the corresponding relation accordingly between battery no-load voltage, the internal resistance of cell, initial cells electricity three;
Described load current processing module also for: calculate battery load current according to the internal resistance of cell under Current Temperatures and cell load voltage, calculate loss of electricity according to battery load current or increase electricity;
Described initial quantity of electricity processing module also for: obtain initial cells electricity according to the battery no-load voltage under Current Temperatures;
Described current electric quantity processing module also for: according to the total electricity of the battery under Current Temperatures, described initial cells electricity and described loss of electricity or increase electricity, calculate current battery charge.
8. the test macro of a kind of battery electric quantity according to claim 6, is characterized in that, when after starting shooting, the first run is tested, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocv-initfor battery start no-load voltage, V
batfor cell load voltage, R
batfor the internal resistance of cell;
When testing when taking turns from second, the computing formula of described battery load current is:
wherein, I
batfor battery load current, V
ocvfor the current no-load voltage of battery, V
batfor cell load voltage, R
batfor the internal resistance of cell.
9. the test macro of a kind of battery electric quantity according to claim 6, is characterized in that, the computing formula of described loss of electricity or increase electricity is:
wherein, Δ C is loss of electricity or increases electricity, and ds is in seconds.
10. the test macro of a kind of battery electric quantity according to claim 6, is characterized in that, the computing formula of described current battery charge is:
wherein, C
curfor current battery charge, C
maxfor the total electricity of battery, C
initfor start electricity, unit is number percent, Δ C is loss of electricity or increase electricity.
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