CN104237801A - Electric quantity calculation device of battery - Google Patents
Electric quantity calculation device of battery Download PDFInfo
- Publication number
- CN104237801A CN104237801A CN201410483217.2A CN201410483217A CN104237801A CN 104237801 A CN104237801 A CN 104237801A CN 201410483217 A CN201410483217 A CN 201410483217A CN 104237801 A CN104237801 A CN 104237801A
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- battery
- voltage
- charging
- input end
- computing unit
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses an electric quantity calculation device of a battery. The electric quantity calculation device of the battery comprises an analog-to-digital sampling controller, a charging branch connected between a charging unit output end and a battery voltage output end, a second resistor with a second resistance value, an electric quantity calculation unit and a timer, wherein the timer triggers the analog-to-digital sampling controller according to a sampling period to carry out sampling, a first input end of the analog-to-digital sampling controller is connected with the charging unit output end and measures first voltage, a second input end of the analog-to-digital sampling controller is connected to the battery voltage output end through the second resistor to measure third voltage, and a third input end of the analog-to-digital sampling controller is directly connected to the battery voltage output end to measure second voltage. The electric quantity calculation unit calculates the residual electric quantity of the battery at least according to the second voltage, the third voltage and the second voltage value.
Description
Technical field
The present invention relates to measurement and the management of battery electric quantity.
Background technology
Along with the raising of hardware performance and the reduction of price, consumption electronic product is day by day universal.Consider all can be furnished with battery as mobile terminals such as smart mobile phone, camera, panel computers for portability, use external power source can be departed from.Battery typically adopts the lithium ion battery that energy density is higher.In order to avoid electricity exhausts the inconvenience brought to user, these equipment generally provide electricity estimation function, such as, the battery dump energy information that the operating system of smart mobile phone can provide precentagewise to show to user, so that user charges in time when electricity is not enough.The smart mobile phone that Fig. 1 shows Android (Android) operating system shows the interface of battery electric quantity, user can see each function of battery dump energy, service time of battery, mobile phone information such as percentage in power consumption at this interface.
At present, the estimation of battery electric quantity mainly contains two kinds of modes.First kind of way is by hardware voltameter Real-Time Monitoring battery electric quantity, but this can increase hardware cost and volume.Another kind of mode estimates electricity by measuring cell voltage.For battery, the OCV curve (open-circuit voltage battery capacity and voltage curve) of cells known, can extrapolate battery capacity according to the cell voltage measured.This mode does not need additional hardware, easily realizes, and is therefore widely used in the portable terminals such as smart mobile phone.But battery itself exists internal resistance, when external discharge current is different, the voltage at battery two ends can change obviously.Therefore, only go to judge that battery electric quantity is very inaccurate by cell voltage, general deviation is greater than 15%.The excessive electricity of error estimates to cause that battery is more more Zao than the time contemplated by user to be exhausted, and causes being discontented with of user.
Therefore, wishing can more accurate estimating battery electricity, and exceeds and increase extra hardware cost.
Summary of the invention
For this reason, the invention provides a kind of battery power amount calculation device, to try hard to solve or at least alleviate Problems existing above.
According to an aspect of the present invention, a kind of battery power amount calculation device being provided, comprising modulus sampling controller, being connected to charging paths between charhing unit output terminal and cell voltage output terminal, there is the second resistor of the second resistance value, for calculating electricity computing unit and the timer of battery electric quantity.Modulus sampling controller comprises first input end, the second input end and the 3rd input end of sampling for measuring voltage.Charging paths comprises first resistor with the first resistance value and the diode of series connection.Timer is used for triggering modulus sampling controller with the sampling period and samples.The first input end of modulus sampling controller is connected to charhing unit output terminal, for measuring the first voltage, second input end of modulus sampling controller is connected to the voltage output end of battery through the second resistance, for measuring tertiary voltage, 3rd input end of modulus sampling controller is directly connected to the voltage output end of battery, for measuring the second voltage.Electricity computing unit is configured at least according to the dump energy of the second voltage, tertiary voltage, the second resistance value calculating battery.
When not charging, electricity computing unit can be configured to according to the second voltage and the difference of tertiary voltage and the ratio calculation power consumption electric current of the second resistance value, and according to the accumulation calculating power consumption of the power consumption electric current in each sampling period.Electricity computing unit can be configured to according to the total electricity of battery and power consumption calculate the dump energy of battery.The total electricity of battery can be the rated capacitance of battery.
Electricity computing unit can be configured to the total electricity of accumulation calculating battery according to charging current in once complete charging process.In complete charging process, electricity computing unit can be configured to deduct power consumption Current calculation charging current according to the first voltage and the difference of the second voltage and the ratio of the first resistance value, and according to the total electricity of accumulation calculating battery of the charging current in each sampling period.
The scope in sampling period can between 0.2-2 second.Sampling period can be 1 second.
Electricity computing unit can be configured to the dump energy of the dump energy before according to charging and the accumulation calculating battery in the charging current in each sampling period.
Above-mentioned battery power amount calculation device hardware configuration is simple, and cost is low, more much higher than being estimated by cell voltage to the accuracy of estimation of battery electric quantity.
According to a further aspect in the invention, provide a kind of mobile terminal, comprise battery and battery power amount calculation device as above.
Accompanying drawing explanation
In order to realize above-mentioned and relevant object; combine description below and accompanying drawing herein to describe some illustrative aspect; these aspects indicate the various modes can putting into practice principle disclosed herein, and all aspects and equivalent aspect thereof are intended to fall in the scope of theme required for protection.Read detailed description below in conjunction with the drawings, above-mentioned and other object of the present disclosure, Characteristics and advantages will become more obvious.Throughout the disclosure, identical Reference numeral is often referred to for identical parts or element.
The smart mobile phone that Fig. 1 shows an Android operation system shows the interface of battery electric quantity;
Fig. 2 shows the schematic diagram of battery power amount calculation device 200 according to an illustrative embodiment of the invention.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
Fig. 2 shows the schematic diagram of battery power amount calculation device 200 according to an illustrative embodiment of the invention.
As shown in Figure 2, battery power amount calculation device 200 comprises modulus (AD) sampling controller 210, charging and tension measuring circuit 220, timer 2 30 and electricity computing unit 240.AD sampling controller 210 comprises the first input end AD for measuring voltage sampling
1, the second input end AD
2with the 3rd input end AD
3.Charging and tension measuring circuit 220 comprise and are connected to charhing unit output terminal and cell voltage output terminal V
batbetween charging paths, what this charging paths comprised series connection has the first resistance value R
1the first resistor and diode D.Charhing unit, from externally fed, generally can comprise the parts such as charging adapter, power management chip.When charhing unit is powered, export the first voltage V
1, such as, the DC voltage of what the charhing unit of smart mobile phone exported is generally 4.5-5V.Now, diode D conducting, voltage is applied to the voltage output end of battery through the first resistor, and battery enters charged state.At the voltage V not from charhing unit
1when, the diode D of charging paths turns off, and battery is in discharge condition.Charging and tension measuring circuit 220 also comprise and have the second resistance value R
2the second resistor.The first input end AD1 of modulus sampling controller 210 is connected to charhing unit output terminal, for measuring the first voltage V
1, the second input end AD2 is through the second resistor R
2be connected to the voltage output end V of battery
bat, for measuring the tertiary voltage V through the second resistor pressure drop
3, the 3rd input end AD
3be directly connected to the voltage output end V of battery
bat, for measuring the second voltage V
2.The correlation parameter that electricity computing unit 240 is measured according to AD sampling controller 210 calculates battery electric quantity.Timer 2 30 is connected with electricity computing unit 240 with AD sampling controller 210, for the timing providing sampling and calculate.Timer 2 30 triggers AD sampling controller 210 with predetermined sampling period T and samples, and electricity computing unit 240 also can calculate battery electric quantity according to predetermined sampling period T in real time.
Below how more detailed description is calculated the electricity of battery by battery power amount calculation equipment 200.
When not charging, when namely the first voltage is 0, charging paths turns off, and battery is in discharge condition.Now, the power consumption electric current I of battery
1can be calculated by following equation (1):
I
1＝(V2-V3)/R
2 (1)
Timer 2 30 triggers AD sampling controller 210 in each cycle T and samples, and electricity computing unit 240 is at the second voltage V of each cycle T according to sampling
2, tertiary voltage V
3with the second resistance value R
2calculate I
1value.Then, electricity computing unit 240 can according to power consumption electric current I
1accumulation calculating in each cycle T power consumption.Such as, suppose that, through n cycle T, the power consumption electric current that each cycle calculates is respectively I
1(k), k=1 ..., n, then at the C of power consumption of n cycle T
consumecan calculate according to following equation (2):
When battery discharges from electricity full state, the dump energy C of battery
remaincan calculate according to following equation (3):
C
remain＝C
full-C
consume (3)
Wherein C
fullit is total electricity of battery.
For newer battery, the total electricity of battery is equivalent to the rated capacitance of battery, such as 2200 Milliampere Hours.Like this, as long as follow the tracks of the power consumption of battery from during battery Full Charge Capacity, the dump energy of battery can just be calculated.
But after battery uses a period of time, aging along with battery, the total electricity of reality of battery may lower than rated capacitance.In one embodiment, total electricity of battery can be corrected by once complete charging process.
When charging, when namely applying the first voltage, charging paths conducting, battery is in charged state.Now, power consumption electric current I
1still can be calculated by equation (1), now enter battery V
batthe charging current I of end
2can calculate according to following equation (4):
I
2＝(V1-V2)/R
1-I
1 (4)
Once complete charging process exhausts to be charged to completely from battery electric quantity to reach the process that battery is full of condition.As the second voltage V measured
2during lower than battery cutoff voltage (as 3.3V), can think that battery electric quantity exhausts completely, now the battery equipment cisco unity malfunction of powering, the CPU of such as mobile phone cannot work, and causes mobile phone to open.The condition that battery is full of can be set to the second voltage V2 and reach battery nominal and be full of voltage (as 4.35V) and charging current is less than a threshold value (as 100mA).
According to charging current I in once complete charging process
2cumulative total electricity C that can calculate battery on each sampling period T
full.The total electricity ratio rated capacitance calculated like this can represent the total electricity of reality of battery more accurately, thus contributes to the dump energy calculating battery more accurately.
When charging, described electricity computing unit can according to the dump energy before charging and the charging current I at each sampling period T
2the cumulative dump energy calculating battery in real time, even if like this in charging process user also can obtain the dump energy information of battery.
It is shorter that sampling period T can be arranged, such as, between 0.2-2 second, to reflect current fluctuation more accurately.Sampling period T can be 1 second.
In a word, electricity computing unit 240 calculates and preserves the dump energy information of battery, and recalculates dump energy information when discharging and charge according to power consumption electric current and/or the cumulative of charging current, thus in real time to the information about power of user feedback battery.Directly the mode of cumulative electric current reflects the essence of electricity, and more accurate with calculated the mode of electricity by voltage compared with, the deviation that its electricity calculates can reduce within 10%.
Although in the figure 2 example timer 2 30, AD sampling controller 210 and electricity computing unit 240 are shown as independent device, should be appreciated that they can be integrated in a device.Such as, the processing power of the AD sampling controller, timer and the CPU that carry in mobile phone CPU can be used to realize the function of above-mentioned device.Charging is simple with tension measuring circuit 220 structure, does not substantially increase hardware cost.
Be to be understood that, in order to simplify the disclosure and to help to understand in each inventive aspect one or more, in the description above to exemplary embodiment of the present invention, each feature of the present invention is grouped together in single embodiment, figure or the description to it sometimes.But, the method for the disclosure should be construed to the following intention of reflection: namely the present invention for required protection requires than the feature more multiple features clearly recorded in each claim.Or rather, as claims below reflect, all features of disclosed single embodiment before inventive aspect is to be less than.Therefore, the claims following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are to be understood that the module of the equipment in example disclosed herein or unit or assembly can be arranged in equipment as depicted in this embodiment, or alternatively can be positioned in one or more equipment different from the equipment in this example.Module in aforementioned exemplary can be combined as a module or can be divided into multiple submodule in addition.
Those skilled in the art are appreciated that and adaptively can change the module in the equipment in embodiment and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and multiple submodule or subelement or sub-component can be put them in addition.Except at least some in such feature and/or process or unit be mutually repel except, any combination can be adopted to combine all processes of all features disclosed in this instructions (comprising adjoint claim, summary and accompanying drawing) and so disclosed any method or equipment or unit.Unless expressly stated otherwise, each feature disclosed in this instructions (comprising adjoint claim, summary and accompanying drawing) can by providing identical, alternative features that is equivalent or similar object replaces.
In addition, those skilled in the art can understand, although embodiments more described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present invention and to form different embodiments.Such as, in the following claims, the one of any of embodiment required for protection can use with arbitrary array mode.
In addition, some in described embodiment are described as at this can by the processor of computer system or the method implemented by other device performing described function or the combination of method element.Therefore, there is the device of processor formation for implementing the method or method element of the necessary instruction for implementing described method or method element.In addition, the element described herein of device embodiment is the example as lower device: this device is for implementing the function performed by the element of the object in order to implement this invention.
As used in this, unless specifically stated so, use ordinal number " first ", " second ", " the 3rd " etc. to describe plain objects and only represent the different instances relating to similar object, and be not intended to imply the object be described like this must have the time upper, spatially, sequence aspect or in any other manner to definite sequence.
Although the embodiment according to limited quantity describes the present invention, benefit from description above, those skilled in the art understand, in the scope of the present invention described thus, it is contemplated that other embodiment.In addition, it should be noted that the language used in this instructions is mainly in order to object that is readable and instruction is selected, instead of select to explain or limiting theme of the present invention.Therefore, when not departing from the scope and spirit of appended claims, many modifications and changes are all apparent for those skilled in the art.For scope of the present invention, be illustrative to disclosing of doing of the present invention, and nonrestrictive, and scope of the present invention is defined by the appended claims.
Claims (10)
1. a battery power amount calculation device, comprising:
Modulus sampling controller, comprises the first input end (AD for measuring voltage sampling
1), the second input end (AD
2) and the 3rd input end (AD
3);
Be connected to the charging paths between charhing unit output terminal and cell voltage output terminal, what comprise series connection has the first resistance value (R
1) the first resistor and diode (D);
There is the second resistance value (R
2) the second resistor;
For calculating the electricity computing unit of battery electric quantity; With
Timer, samples for triggering modulus sampling controller with the sampling period (T),
Wherein, the first input end (AD of modulus sampling controller
1) be connected to charhing unit output terminal (V
1), for measuring the first voltage (V
1), the second input end (AD of modulus sampling controller
2) through the second resistance (R
2) be connected to the voltage output end of battery, for measuring tertiary voltage (V
3), the 3rd input end (AD of modulus sampling controller
3) be directly connected to the voltage output end of battery, for measuring the second voltage (V
2),
Described electricity computing unit is configured at least according to the second voltage (V
2), tertiary voltage (V
3), the second resistance value (R
2) calculate the dump energy of battery.
2. device as claimed in claim 1, wherein when not charging, described electricity computing unit is configured to according to the second voltage (V
2) and tertiary voltage (V
3) difference and the second resistance value (R
2) ratio calculation power consumption electric current (I
1), and according to the accumulation calculating power consumption (C of the power consumption electric current in each sampling period (T)
consume).
3. device as claimed in claim 2, wherein said electricity computing unit is configured to according to the total electricity (C of battery
full) and power consumption (C
consume) calculate the dump energy (C of battery
remain).
4. device, the wherein total electricity (C of battery as claimed in claim 3
full) be the rated capacitance of battery.
5. device as claimed in claim 3, wherein said electricity computing unit is configured to according to charging current (I in once complete charging process
2) the total electricity (C of accumulation calculating battery
full).
6. device as claimed in claim 5, wherein in complete charging process, described electricity computing unit is configured to according to the first voltage (V
1) and the second voltage (V
2) difference and the first resistance value (R
1) ratio deduct power consumption electric current (I
1) calculate charging current (I
2), and according to the charging current (I in each sampling period (T)
2) the total electricity of accumulation calculating battery.
7. device as claimed in claim 2, the scope in wherein said sampling period (T) is between 0.2-2 second.
8. device as claimed in claim 6, wherein when charging, described electricity computing unit is configured to the dump energy before according to charging and the charging current (I in each sampling period (T)
2) the dump energy of accumulation calculating battery.
9. device as claimed in claim 7, the wherein said sampling period (T) is 1 second.
10. a mobile terminal, comprises battery and as the battery power amount calculation device in claim 1-9 as described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410483217.2A CN104237801B (en) | 2014-08-20 | 2014-09-19 | Electric quantity calculation device of battery |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410411582 | 2014-08-20 | ||
| CN201410411582.2 | 2014-08-20 | ||
| CN2014104115822 | 2014-08-20 | ||
| CN201410483217.2A CN104237801B (en) | 2014-08-20 | 2014-09-19 | Electric quantity calculation device of battery |
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| Publication Number | Publication Date |
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| CN104237801A true CN104237801A (en) | 2014-12-24 |
| CN104237801B CN104237801B (en) | 2017-02-15 |
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2014
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Patent Citations (8)
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|---|---|---|---|---|
| EP0359237A2 (en) * | 1988-09-13 | 1990-03-21 | Nec Corporation | Apparatus for displaying the remaining charge of rechargeable battery |
| US20040220758A1 (en) * | 2002-12-29 | 2004-11-04 | Evgenij Barsoukov | Circuit and method for measurement of battery capacity fade |
| JP2008213708A (en) * | 2007-03-06 | 2008-09-18 | Toyota Motor Corp | Power source management device for vehicle |
| WO2011050670A1 (en) * | 2009-10-29 | 2011-05-05 | Byd Company Limited | Device and method for testing internal resistance of battery pack |
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|---|---|
| CN104237801B (en) | 2017-02-15 |
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Effective date of registration: 20230726 Address after: 518051 Room 201, building a, No.1 Qianwan 1st Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen City, Guangdong Province Patentee after: Shenzhen Hanfeng Microelectronics Co.,Ltd. Address before: 361009 112a, Pioneer Building, Pioneer Park, torch hi tech Zone, Xiamen City, Fujian Province Patentee before: Xiamen Meitu Mobile Technology Co.,Ltd. |