CN102944847B - Battery electricity detection method and system - Google Patents
Battery electricity detection method and system Download PDFInfo
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- CN102944847B CN102944847B CN201210472273.7A CN201210472273A CN102944847B CN 102944847 B CN102944847 B CN 102944847B CN 201210472273 A CN201210472273 A CN 201210472273A CN 102944847 B CN102944847 B CN 102944847B
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Abstract
The present invention relates to a kind of battery electricity detection method and system, it is characterized in that, described method comprises: provide variable charge current to battery, and described charging current comprises the first charging current and the second charging current; Detect the voltage at described battery two ends, when described charging current is the first charging current, described battery both end voltage is the first voltage, and when described charging current is the first charging current, the voltage at described battery two ends is the second voltage; The internal resistance of described battery is calculated according to described first charging current, the second charging current, the first voltage and the second voltage; Calculate the capacitance voltage of described battery according to described internal resistance, and obtain the dump energy of described battery.Battery electricity detection method disclosed by the invention and detection system, by the accurate Calculation to battery equivalent resistance, realize the accurate detection to battery electric quantity.
Description
Technical field
The present invention relates to a kind of detection method and system of battery electric quantity, particularly relating to a kind of by detecting battery internal resistance, thus to the method and system that battery electric quantity detects.
Background technology
In the epoch that portable electric appts is more and more popularized, the portable sets such as mobile phone, PDA, notebook computer, Medical Devices and surveying instrument are seen everywhere, portable equipment is more and more personalized, diversified, and what uniquely do not change is exactly that all portable set is all by powered battery.If battery electric quantity display is inaccurate, in user's use procedure, unexpected power-off, likely causes communicating interrupt, loss of data, even more serious consequence.Thus the remaining battery power grasping electronic equipment is accurately particularly important.
Traditional battery power amount calculation method calculates battery electric quantity by sampling battery voltage and battery current.Battery is equivalent to an electric capacity-resistance in series equivalent-circuit model as shown in Figure 1, and this electric routing capacitance Cb and two resistance of connecting with it (comprise R
1and R
2) composition.This model has voltage-capacity percentage relation curve (the voltage capacity graph of relation of the lithium battery of a kind of 4.2V such as shown in Fig. 2) known after tested in battery producer making cell process.By measuring the voltage V between BATP and the BATN of battery two ends
bATwith internal current I
bAT, and according to the equivalent series resistance R set
1, R
2just can calculate the voltage V at electric capacity Cb two ends
cb=V
bAT-(R
1+ R
2) × I
bAT, then the residual capacity of battery is obtained according to voltage-capacity percentage relation curve.
As everyone knows, the electricity of battery can slowly reduce along with the use of battery, but when cell degradation, one also occurs immediately with internal battery impedance relevant issues: the increase of impedance is much more remarkable than the reduction of battery electric quantity.Typical lithium ion battery is after 70 charge and discharge cycles, and inner DC impedance can double, and the non-loaded electricity of same period only can decline 2% ~ 3%.In prior art, battery internal resistance value is set to steady state value, if ignore the factor of impedance increase according to above-mentioned traditional battery meter metering method, when battery only reaches 15% of serviceable life, use original battery internal driving data calculating battery electric quantity to produce and can reach 50% gross error.
Summary of the invention
The object of the invention is the defect for prior art, a kind of battery electricity detection method and system are provided, by the accurate Calculation to battery equivalent resistance, often can upgrade equivalent resistance, realize the accurate detection to battery dump energy.
For achieving the above object, first aspect the invention provides a kind of battery electricity detection method, and described method comprises:
There is provided variable charge current to battery, described charging current comprises the first charging current and the second charging current;
Detect the voltage at described battery two ends, when described charging current is the first charging current, described battery both end voltage is the first voltage, and when described charging current is the second charging current, the voltage at described battery two ends is the second voltage;
The internal resistance of described battery is calculated according to described first charging current, the second charging current, the first voltage and the second voltage;
Calculate the capacitance voltage of described battery according to described internal resistance, and obtain the dump energy of described battery.
Second aspect the invention provides a kind of battery electric quantity and detects detection system, and described system comprises: charging circuit able to programme, tension measuring circuit and processor;
Charging circuit able to programme, for providing variable charge current to battery, described charging current comprises the first charging current and the second charging current;
Tension measuring circuit, for detecting the voltage at described battery two ends, when described charging current is the first charging current, the described battery both end voltage detected is the first voltage, when described charging current is the second charging current, the voltage at the described battery two ends detected is the second voltage;
Processor, comprises internal resistance computing unit and electricity calculates output unit; Described internal resistance computing unit, for calculating the internal resistance of described battery according to described first charging current, the second charging current, the first voltage and the second voltage; Described electricity calculates output unit, for calculating the capacitance voltage of described battery according to described internal resistance, and obtains the dump energy of described battery.
So the battery electricity detection method of the embodiment of the present invention, cause change in voltage by the change of charging current, by to measure and ratio both utilizing accurately calculates the equivalent resistance of battery, thus realize measuring accurately battery electric quantity, eliminate in electrical measurement because battery equivalent resistance changes brought error with cell degradation.
Accompanying drawing explanation
Fig. 1 is the electric capacity-resistance in series equivalent-circuit model schematic diagram of battery;
Fig. 2 is a kind of voltage-capacity graph of relation of 4.2V lithium battery;
The process flow diagram of the battery electricity detection method that Fig. 3 provides for the embodiment of the present invention one;
The process flow diagram of the battery electricity detection method that Fig. 4 provides for the embodiment of the present invention two;
The block diagram of the battery electric quantity detection system that Fig. 5 provides for the embodiment of the present invention three;
The block diagram of the battery electric quantity detection system that Fig. 6 provides for the embodiment of the present invention four;
Fig. 7 for the embodiment of the present invention four provide a kind of constant-current discharge circuit diagram.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The battery electricity detection method that the embodiment of the present invention provides and system, adopt and connect charge/discharge circuit and tension measuring circuit at the both positive and negative polarity of battery, by variable charging current or constant discharge current, and the variable quantity of voltage obtains battery internal resistance, thus calculate the voltage of battery capacitor and the dump energy of battery.This scheme can be applied to the electric power detection of all rechargeable batteries, effectively eliminates because battery equivalent resistance changes brought error with cell degradation in electrical measurement, for user provides electric quantity data more accurately.
For a better understanding of the present invention, state in each embodiment under the invention, battery to be measured is all described for electric capacity as shown in Figure 1-resistance in series equivalent model.The major parameter that this model comprises is as shown in table 1, and following parameter will be used for the calculating process of each embodiment.
| Equivalent capacity | Cb |
| Anode equivalent resistance | R 1 |
| Battery cathode equivalent resistance | R 2 |
| Equivalent series resistance | R（R=R 1+R 2） |
| Capacitance voltage | V Cb |
| The voltage at battery two ends | V BAT |
Table 1
The process flow diagram of the battery electricity detection method that Fig. 3 embodiment of the present invention one provides, the present embodiment is by utilizing transformable charging current to realize measuring the dump energy of battery to the method that battery charges.As shown in the figure, the battery electric quantity of the present embodiment one detects and specifically comprises the steps:
Step 310, provides variable charge current to battery, and described charging current comprises the first charging current and the second charging current;
Concrete, add a charging current at the positive pole of battery, and form loop by negative pole, this size of current can be artificial input or programming setting in advance.In charging process, can there is one or many change in electric current.Electric current before setting change is the first electric current I
1, the electric current after change is the second electric current I
2, therefore the variable quantity of electric current is I
2-I
1.In particular embodiments, the first electric current I
1with the second electric current I
2applying process all very short, such as 1ms, therefore to capacitance voltage V in battery equivalent electrical circuit
cbcan ignore with the impact of electricity, hereafter can be described in detail, not repeat them here.
Step 320, detect the voltage at battery two ends, when charging current is the first charging current, battery both end voltage is the first voltage, and when charging current is the second charging current, the voltage at battery two ends is the second voltage;
Concrete, be the first charging current I in charging current
1the voltage V at equivalent electrical circuit two ends is measured in situation
bAT, now V
bAT=V
bAT1; Then the second charging current I is become in charging current
2the voltage V at equivalent electrical circuit two ends is measured in situation
bAT, now V
bAT=V
bAT2; Can calculate the voltage variety produced with curent change is thus V
bAT2-V
bAT1.
Step 330, calculates the internal resistance of battery according to the first charging current, the second charging current, the first voltage and the second voltage;
Concrete, the internal resistance of battery represents with equivalent series resistance R, R=|V
bAT2– V
bAT1|/| I
2-I
1|.Because the change of electric current can be increase or reduce, when electric current is by I
1to I
2during increase, the voltage consumed on equivalent series resistance R also increases thereupon, therefore the voltage V at equivalent electrical circuit two ends
bATincrease, i.e. V
bAT2be greater than V
bAT1; Otherwise, when electric current is by I
1to I
2during reduction, the voltage consumed on equivalent series resistance R also reduces thereupon, therefore the voltage V at equivalent electrical circuit two ends
bATreduce, i.e. V
bAT2be less than V
bAT1.Therefore the absolute value of voltage variety and current change quantity is adopted to calculate.
In one example in which, binary data can be adopted to carry out the calculating of R.Now need setting with reference to reference voltage V
0with reference reference current I
0, by calculating | I
2-I
1| with reference reference current I
0ratio round and do binary data and be converted to binary data corresponding to charging current variable quantity, these data show charging current variable quantity and the multiple proportion with reference to reference current; By calculating | V
bAT2– V
bAT1| with reference reference voltage V
0ratio round and do binary data and be converted to binary data corresponding to voltage variety, these data show measured voltage and the multiple proportion with reference to reference voltage.Such as: setting is with reference to reference voltage V
0=1mV, with reference to reference current I
0=1mA, therefore known with reference to reference resistance R
0=V
0/ I
0=1 Ω.Now the binary data computing formula of R develop into R '=(| V
bAT2– V
bAT1|/V
0)/(| I
2-I
1|/I
0).R ' represents for the binary data of equivalent series resistance R, represents battery equivalent resistance R relative to reference reference resistance R
0multiple proportion.The binary number R ' calculated in certain above-mentioned formula also can be decimal.This binary processing mode is particularly useful for digitization system.
Step 340, calculates the capacitance voltage of battery according to internal resistance, and obtains the dump energy of battery;
Concrete, be divided into three steps:
Step 340a, the voltage at battery two ends and internal current under testing state;
Step 340b, according to formula V
cb=V
bAT-R × I
bATcalculate capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, R is internal resistance, I
bATfor internal current, wherein, I
bATwith charging current direction for positive dirction, namely inside battery current equivalence is (as battery under duty not only in charging but also to load discharge) when charging to battery, I
bATfor on the occasion of, when inside battery current equivalence is discharge current (only to load discharge under as duty), I
bATfor negative value;
Step 340c, according to capacitance voltage V
cbobtain and export dump energy number percent.
Concrete, according to capacitance voltage V
cbsearch in the voltage-capacity percentage relation curve of this battery provided in battery manufacture producer, draw corresponding dump energy number percent, and user can be exported to check.
It should be noted that, in the above-described embodiments, apply to battery the change that charging current also can cause cell voltage and capacity, therefore in particular embodiments, the first electric current I
1with the second electric current I
2applying process all very short, such as 1ms, the setting of this time is wanted to meet to measure stable magnitude of voltage.Such as, battery capacity is 1000mAh, and namely battery can with the current discharge 1 hour (3600 seconds) of 1000mA.Suppose the first electric current I
1for 400mA, the second electric current I
2for 300mA, therefore current change quantity is 100mA, and the internal resistance of cell is 1 Ω, and known pressure drop in internal resistance (i.e. equivalent series resistance) is 0.1V, and the capacity of battery drops to (400mA × 1ms)/(1000mA × 3600S)=1.112 × 10
-5%, it can thus be appreciated that due to 400mA charging current charge in 1mS produce to battery capacity calculate error be only 1.112X10
-5%, and in great majority application, electricity display is accurate to 1%, therefore utilizes charging current to carry out in the process of residual capacity measurement to battery charging, applies charging current for capacitance voltage V in battery equivalent electrical circuit
cbcan ignore with the impact of electricity.
The battery electricity detection method that the present embodiment provides utilizes the change of charging current to cause change in voltage, by to measure and ratio both utilizing accurately calculates the equivalent resistance of battery, thus eliminate because battery equivalent resistance changes brought error with cell degradation in the measuring process of battery electric quantity, realize measuring accurately battery electric quantity, improve Consumer's Experience.
The process flow diagram of the battery electricity detection method that Fig. 4 provides for the embodiment of the present invention two, the present embodiment is by utilizing constant discharge current to realize measuring the dump energy of battery to the method for battery discharge.As shown in the figure, the battery electric quantity of the present embodiment two detects and specifically comprises the steps:
Step 410, battery carries out constant-current discharge according to constant discharge current;
Concrete, discharge to battery, this size of current can be artificial input or programming setting in advance.In discharge process, electric current is constant.Setting constant-current discharge electric current is I
3.In particular embodiments, constant-current discharge electric current I
3applying process very short, such as 1ms, therefore to capacitance voltage V in battery equivalent electrical circuit
cbcan ignore with the impact of electricity, hereafter can be described in detail, not repeat them here.
Step 420, detect the voltage at battery two ends, before battery constant-current discharge, battery both end voltage is tertiary voltage, and during battery constant-current discharge, battery both end voltage is the 4th voltage;
Concrete, do not carrying out in constant-current discharge situation, measuring the voltage V at equivalent electrical circuit two ends
bAT, now V
bAT=V
bAT3; Then, when constant-current discharge, discharge current is I
3, measure the voltage V at equivalent electrical circuit two ends
bAT, now V
bAT=V
bAT4; Can calculate the voltage variety produced with curent change is thus V
bAT3-V
bAT4.
Step 430, calculates the internal resistance of battery according to constant discharge current and tertiary voltage, the 4th voltage;
Concrete, equivalent series resistance R=(V
bAT3-V
bAT4)/I
3.Portion voltage consumption is had on equivalent series resistance R, the voltage V at electrical equivalent two ends of therefore discharging in discharge process
bAT4be less than V
bAT3.
In one example in which, binary data can be adopted to carry out the calculating of R.Now need setting with reference to reference voltage V
0with reference reference current I
0, by calculating I
3with reference reference current I
0ratio round and do binary data and be converted to binary data corresponding to constant discharge current; By calculating (V
bAT3-V
bAT4) and reference voltage V
0ratio round and do binary data and be converted to binary data corresponding to voltage variety.Such as: setting reference voltage V
0=1mV, reference current I
0=1mA, therefore known reference resistance R
0=V
0/ I
0=1 Ω.Now the binary data computing formula of R develops into R '=((V
bAT3-V
bAT4)/V
0)/(I
3/ I
0).R ' represents for the binary data of equivalent series resistance R, represents battery equivalent resistance R relative to reference resistance R
0multiple proportion.The binary number R ' calculated in certain above-mentioned formula also can be decimal.In addition, constant discharge current I
3the setting of value can also directly input in binary form.This binary processing mode is particularly useful for digitization system.
Step 440, calculates the capacitance voltage of battery according to internal resistance, and obtains the dump energy of battery;
Concrete, be divided into three steps:
Step 440a, the voltage at battery two ends and internal current under testing state;
Step 440b, according to formula V
cb=V
bAT-R × I
bATcalculate capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, R is internal resistance, I
bATfor internal current, wherein, I
bATwith charging current direction for positive dirction, namely inside battery current equivalence is (as battery under duty not only in charging but also to load discharge) when charging to battery, I
bATfor on the occasion of, when inside battery current equivalence is discharge current (only to load discharge under as duty), I
bATfor negative value;
Step 440c, according to capacitance voltage V
cbobtain and export dump energy number percent.
Concrete, according to capacitance voltage V
cbcarry out searching in the voltage-capacity percentage relation curve of this battery provided in battery manufacture producer and draw corresponding dump energy number percent, and user can be exported to check.
It should be noted that, in the above-described embodiments, apply to battery the change that constant discharge current also can cause cell voltage and capacity, therefore in particular embodiments, constant discharge current I
3applying process very short, such as 1ms, the setting of this time is wanted to meet to measure stable magnitude of voltage.Such as, battery capacity is 1000mAh, and namely battery can with the current discharge 1 hour (3600 seconds) of 1000mA.Suppose that discharge current is 100mA, the internal resistance of cell is 1 Ω, and known pressure drop in internal resistance (i.e. equivalent series resistance) is 0.1V, and the capacity of battery drops to (100mA × 1ms)/(1000mA × 3600S)=2.78 × 10
-6%, it can thus be appreciated that cause being only 2.78 × 10 to measuring capacitance capacity error due to 100mA discharge current within the 1mS time
-6%, therefore utilizes constant discharge current to carry out in the process of residual capacity measurement to battery discharge, applies constant discharge current for capacitance voltage V in battery equivalent electrical circuit
cbcan ignore with the impact of electricity.
The battery electricity detection method that the present embodiment provides utilizes constant discharge current to discharge to battery, apply the change in voltage before and after discharge current by measurement and utilize the ratio of this variable quantity and discharge current to accurately calculate the equivalent resistance of battery, thus eliminate because battery equivalent resistance changes brought error with cell degradation in the measuring process of battery electric quantity, realize measuring accurately battery electric quantity, improve Consumer's Experience.
The battery electric quantity detection system that Fig. 5 provides for the embodiment of the present invention three, as shown in the figure, the battery electric quantity detection system of the present embodiment specifically comprises charging circuit 520 able to programme, tension measuring circuit 530 and processor 540.Battery electric quantity detection system is for detecting the battery 510 in Fig. 5.In the present embodiment, battery 510 illustrates with electric capacity-resistance in series equivalent electrical circuit form, and battery 510 also can adopt other equivalent electrical circuit form in actual applications.
Charging circuit 520 able to programme, is connected to the positive and negative end of battery, and for providing variable charge current to battery, charging current comprises the first charging current and the second charging current.Charging circuit 520 able to programme specifically can adopt charging chip able to programme to add that simple peripheral circuit can realize, and certainly, other circuit forms also can be adopted to realize.
Tension measuring circuit 530, be connected to the positive and negative end of battery, for detecting the voltage at described battery two ends, when charging current is the first charging current, the battery both end voltage detected is the first voltage, when charging current is the second charging current, the voltage at the battery two ends detected is the second voltage; In digitization system, tension measuring circuit 530 can adopt analog to digital converter to realize, and analog voltage is converted into binary data.
Processor 540, comprises internal resistance computing unit 541 and electricity calculates output unit 542; Internal resistance computing unit 541, the first voltage that the first charging current, the second charging current and tension measuring circuit 530 for providing according to charging circuit 520 able to programme provide and the second voltage calculate the internal resistance of battery; Electricity calculates output unit 542, for calculating the capacitance voltage of battery according to internal resistance, and obtains the dump energy of described battery.
Further, the calculating that internal resistance computing unit 541 performs is specifically for calculating the ratio of the voltage variety between the second voltage and the first voltage and the current change quantity between the second charging current and the first charging current, obtain the internal resistance of battery, concrete formula is:
R=｜V
BAT2-V
BAT1｜/｜I
2-I
1｜
Wherein I
1be the first charging current, I
2be the second charging current, V
bAT1be the first voltage, V
bAT2be the second voltage, R is internal resistance.
Further, battery electric quantity detection system also comprises reference voltage current unit 543, for setting reference voltage V
0with reference current I
0.Perform in internal resistance computing unit 541 and calculate voltage variety and reference voltage V
0ratio and current change quantity and reference current I
0ratio compare, obtain the binary numeral of internal resistance.
Further, capacitance voltage computing unit 542 is specifically for the voltage at battery two ends under testing state and internal current; According to formula V
cb=V
bAT-R × I
bATcalculate capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, R is internal resistance, I
bATfor internal current, wherein, I
bAT withcharging current direction is positive dirction, and namely inside battery current equivalence is (as battery under duty not only in charging but also to load discharge) when charging to battery, I
bATfor on the occasion of, when inside battery current equivalence is discharge current (only to load discharge under as duty), I
bATfor negative value; The dump energy of battery is obtained according to capacitance voltage.The battery of each model has the capacity of its correspondence and the corresponding relation of voltage, usually can provide voltage-capacity percentage relation curve by battery manufacture producer, therefore according to calculating the capacitance voltage V obtained
cbcarry out searching in voltage-capacity percentage relation curve and just can obtain dump energy number percent, and user can be exported to check.
The charging current that the battery electric quantity detection system that the present embodiment provides adopts charging circuit 520 able to programme to change, and the change in voltage utilizing voltage detecting circuit 530 to detect curent change to cause, the computing of the variable quantity of above-mentioned electric current and voltage is performed in processor 540, accurately calculate the internal resistance of battery, thus eliminate because battery equivalent resistance changes brought error with cell degradation in the measuring process of battery electric quantity, realize measuring accurately battery electric quantity, improve Consumer's Experience.
The battery electric quantity detection system that Fig. 6 provides for the embodiment of the present invention four, as shown in the figure, the battery electric quantity detection system of the present embodiment specifically comprises constant-current discharge circuit 620, tension measuring circuit 630 and processor 640.Battery electric quantity detection system is for detecting the battery 610 in Fig. 6.In the present embodiment, battery 610 illustrates with electric capacity-resistance in series equivalent electrical circuit form, and battery 610 also can adopt other equivalent electrical circuit form in actual applications.
Constant-current discharge circuit 620, being connected to the both positive and negative polarity section of company of battery, discharging for making battery according to constant discharge current.Constant-current discharge circuit 620 has multiple circuit implementations, such as the simplest, can adopt integrated operational amplifier circuit to realize, or adopts the form of a kind of constant-current discharge circuit as shown in Figure 7 to realize.Certainly, other circuit forms also can be adopted to realize.
In one example in which, as shown in Figure 7, if setting constant-current discharge electric current is I
3=100mA, I
d0=1mA, I
d1=2mA, I
d2=4mA, I
d3=8mA, I
d4=16mA, I
d5=32mA, I
d6=64mA, I
d7=128mA, then need setting D0, D1, D3, D4, D7 to be low level, and setting D2, D5, D6 are high level.The eight-digit binary number data that D7-D0 is corresponding are then 01100100, thus to realize the discharge circuit node A discharge current corresponding with Node B be 64mA+32mA+4mA=100mA.
Tension measuring circuit 630, is connected to the positive and negative end of battery, and for detecting the voltage at battery two ends, before battery constant-current discharge, the battery both end voltage detected is tertiary voltage, and during battery constant-current discharge, the battery both end voltage detected is the 4th voltage.Tension measuring circuit 630 can adopt analog to digital converter that analog voltage is converted into binary data.
Processor 640, comprises internal resistance computing unit 641 and voltage calculates output unit 642; Internal resistance computing unit 641, for calculating the internal resistance of battery according to constant discharge current and tertiary voltage, the 4th voltage; Voltage calculates output unit 642, for calculating the capacitance voltage of battery according to internal resistance, and obtains the dump energy of battery.
Further, internal resistance computing unit is specifically for the ratio between the voltage variety between calculating tertiary voltage and the 4th voltage and constant discharge current, and obtain the internal resistance of battery, concrete formula is:
R=（V
BAT3-V
BAT4）/I
3
Wherein I
3for constant discharge current, V
bAT3for tertiary voltage, V
bAT4be the 4th voltage, R is internal resistance.
Further, detection system also comprises reference voltage current unit 643, for setting reference voltage V
0with reference current I
0, perform in internal resistance computing unit 641 calculate by the ratio of voltage variety and reference voltage with constant discharge current compared with the ratio of reference current, obtain the binary numeral of internal resistance.
Further, capacitance voltage computing unit 642 is specifically for the voltage at battery two ends under testing state and internal current; According to formula V
cb=V
bAT-R × I
bATcalculate capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, R is internal resistance, I
bATfor internal current, wherein, I
bATwith charging current direction for positive dirction, namely inside battery current equivalence is (as battery under duty not only in charging but also to load discharge) when charging to battery, I
bATfor on the occasion of, when inside battery current equivalence is discharge current (only to load discharge under as duty), I
bATfor negative value; The dump energy of battery is obtained according to capacitance voltage.The battery of each model has the capacity of its correspondence and the corresponding relation of voltage, usually can provide voltage-capacity percentage relation curve by battery manufacture producer, therefore according to calculating the capacitance voltage V obtained
cbcarry out searching in voltage-capacity percentage relation curve and just can obtain dump energy number percent, and user can be exported to check.
The battery electric quantity detection system that the present embodiment provides adopts constant-current discharge circuit 620 to produce constant discharge current, and utilize voltage detecting circuit 630 to detect the change in voltage applied before and after discharge current, computing is carried out according to the variable quantity of above-mentioned electric current and voltage in processor 640, accurately calculate the equivalent resistance of battery, thus eliminate because battery equivalent resistance changes brought error with cell degradation in the measuring process of battery electric quantity, realize measuring accurately battery electric quantity, improve Consumer's Experience.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a battery electricity detection method, is characterized in that, described method comprises:
There is provided variable charge current to battery, described charging current comprises the first charging current and the second charging current, and the application time of described charging current is to meet the shortest time measuring stable magnitude of voltage, is 1 millisecond;
Detect the voltage at described battery two ends, when described charging current is the first charging current, described battery both end voltage is the first voltage, and when described charging current is the second charging current, the voltage at described battery two ends is the second voltage;
The internal resistance of described battery is calculated according to described first charging current, the second charging current, the first voltage and the second voltage;
Calculate the capacitance voltage of described battery according to described internal resistance, and obtain the dump energy of described battery;
The described internal resistance calculating described battery according to the first charging current, the second charging current and the first voltage and the second voltage is specially, compared with voltage variety between second voltage with the first voltage and the current change quantity between the second charging current with the first charging current, obtain the internal resistance of battery;
Described method also comprises setting reference voltage and reference current, utilizes described reference voltage and reference current that described internal resistance is treated to binary data.
2. method according to claim 1, is characterized in that, the described capacitance voltage calculating described battery according to described internal resistance, and the step obtaining the dump energy of described battery is specially:
The voltage at described battery two ends and internal current under testing state;
According to formula V
cb=V
bAT-R × I
bATcalculate described capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, I
bATfor internal current, R is internal resistance;
The dump energy of described battery is obtained according to described capacitance voltage.
3. method according to claim 2, is characterized in that, the described dump energy obtaining described battery according to described capacitance voltage is specially, according to described capacitance voltage corresponding go out the dump energy of described battery.
4. a battery electric quantity detection system, is characterized in that, described system comprises: charging circuit able to programme, tension measuring circuit and processor;
Charging circuit able to programme, for providing variable charge current to battery, described charging current comprises the first charging current and the second charging current, and the application time of described charging current is to meet the shortest time measuring stable magnitude of voltage, is 1 millisecond;
Tension measuring circuit, for detecting the voltage at described battery two ends, when described charging current is the first charging current, the described battery both end voltage detected is the first voltage, when described charging current is the second charging current, the voltage at the described battery two ends detected is the second voltage;
Processor, comprises internal resistance computing unit and electricity calculates output unit; Described internal resistance computing unit, the first voltage that described first charging current, the second charging current and tension measuring circuit for providing according to charging circuit able to programme provide and the second voltage calculate the internal resistance of described battery; Described electricity calculates output unit, for calculating the capacitance voltage of described battery according to described internal resistance, and obtains the dump energy of described battery;
Described internal resistance computing unit, specifically for calculating the ratio of the voltage variety between the second voltage and the first voltage and the current change quantity between the second charging current and the first charging current, obtains the internal resistance of battery;
Described detection system also comprises reference voltage current unit, for setting reference voltage and reference current, utilizes described reference voltage and reference current that described internal resistance is treated to binary data.
5. detection system according to claim 4, is characterized in that, described electricity calculates output unit specifically for the voltage at battery two ends described under testing state and internal current; According to formula V
cb=V
bAT-R × I
bATcalculate described capacitance voltage, wherein V
cbfor capacitance voltage, V
bATfor the voltage at battery two ends, I
bATfor internal current, R is internal resistance; The dump energy of described battery is obtained according to described capacitance voltage.
6. detection system according to claim 5, is characterized in that, the described dump energy obtaining described battery according to described capacitance voltage is specially, according to described capacitance voltage corresponding go out the dump energy of described battery.
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|---|---|---|---|
| CN201210472273.7A CN102944847B (en) | 2012-11-20 | 2012-11-20 | Battery electricity detection method and system |
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| CN104035040A (en) * | 2014-06-05 | 2014-09-10 | 嘉兴市恒欣电力建设有限公司 | Tramegger battery detection device |
| JP6386816B2 (en) * | 2014-06-30 | 2018-09-05 | エイブリック株式会社 | Battery state monitoring circuit and battery device |
| CN105334463A (en) * | 2014-08-08 | 2016-02-17 | 中兴通讯股份有限公司 | Battery and electric quantity detection method and system thereof |
| CN104237801B (en) * | 2014-08-20 | 2017-02-15 | 厦门美图移动科技有限公司 | Electric quantity calculation device of battery |
| CN106093780A (en) * | 2016-05-31 | 2016-11-09 | 青岛海信移动通信技术股份有限公司 | A kind of terminal residual electricity determines method and terminal |
| CN106324512B (en) * | 2016-08-10 | 2019-03-15 | 杭州瑞利科技有限公司 | A kind of wind light mutual complementing energy storage battery capacity check method |
| CN106932729A (en) * | 2017-04-14 | 2017-07-07 | 深圳市金立通信设备有限公司 | A kind of battery voltage detection method and terminal |
| CN107741565A (en) * | 2017-09-18 | 2018-02-27 | 河源市美晨联合智能硬件电子研究院 | Measurement apparatus, method, mobile terminal and readable storage medium storing program for executing |
| JP6969464B2 (en) * | 2018-03-19 | 2021-11-24 | トヨタ自動車株式会社 | Deterioration state estimation method for secondary battery system and secondary battery |
| CN109143073A (en) * | 2018-06-06 | 2019-01-04 | 安徽锐能科技有限公司 | The detection method of monomer voltage for battery pack |
| CN108964173A (en) * | 2018-06-06 | 2018-12-07 | 安徽锐能科技有限公司 | Active equalization system for battery pack |
| CN108879820A (en) * | 2018-06-06 | 2018-11-23 | 安徽锐能科技有限公司 | Modification method and system for equalizing circuit |
| CN109116239A (en) * | 2018-06-06 | 2019-01-01 | 安徽锐能科技有限公司 | The detection system of monomer voltage for battery pack |
| CN108988409A (en) * | 2018-06-06 | 2018-12-11 | 安徽锐能科技有限公司 | Active equalization method for battery pack |
| CN108964171A (en) * | 2018-06-06 | 2018-12-07 | 安徽锐能科技有限公司 | Passive equalization methods and system for battery pack |
| CN108832671A (en) * | 2018-06-06 | 2018-11-16 | 安徽锐能科技有限公司 | Active equalization method and system for battery pack |
| CN110282279A (en) * | 2019-06-06 | 2019-09-27 | 江苏农牧科技职业学院 | A kind of cold chain cold-storage box for material circulation based on big data |
| CN113721155A (en) * | 2021-11-03 | 2021-11-30 | 深圳市云鼠科技开发有限公司 | Method, device, equipment and storage medium for determining residual capacity of battery |
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| KR100384160B1 (en) * | 2000-12-27 | 2003-05-16 | 현대자동차주식회사 | Method for modeling operation the charge/discharge characteristics of a battery according to a status of capacitance |
| JP4010288B2 (en) * | 2003-07-29 | 2007-11-21 | ソニー株式会社 | Secondary battery remaining capacity calculation method and battery pack |
| KR100494947B1 (en) * | 2003-08-07 | 2005-06-13 | 현대자동차주식회사 | A method for calculating a steady state battery terminal voltage |
| CN100523855C (en) * | 2007-04-29 | 2009-08-05 | 赵东元 | Method and device for monitoring accumulator property using transient DC small current electric quantity comparison method |
| TWI398028B (en) * | 2007-07-20 | 2013-06-01 | Hon Hai Prec Ind Co Ltd | Apparatus and method for measuring internal resistance of battery |
| CN203101598U (en) * | 2012-11-20 | 2013-07-31 | 无锡中星微电子有限公司 | Cell electricity quantity detection system |
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