CN103064026B - Vehicle battery remaining capacity monitoring method - Google Patents
Vehicle battery remaining capacity monitoring method Download PDFInfo
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- CN103064026B CN103064026B CN201210410368.6A CN201210410368A CN103064026B CN 103064026 B CN103064026 B CN 103064026B CN 201210410368 A CN201210410368 A CN 201210410368A CN 103064026 B CN103064026 B CN 103064026B
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Abstract
The invention discloses a vehicle battery remaining capacity monitoring method, and belongs to the field of battery monitoring. According to the method, a battery group charge-discharge process is controlled with a real-time current accumulation method, real-time temperature correction is carried out; errors of remaining capacity are reduced, accuracy of the remaining capacity is improved, a more accurate battery charge state can be obtained, and meanwhile a judge method of battery aging is provided, so that an operator can visually and accurately know the state of a battery, and great convenience is brought to a driver.
Description
Technical field
The invention belongs to battery detection field, particularly relate to a kind of Vehicular battery dump energy monitoring method.
Background technology
At present, electric automobile generally adopts can the lead-acid battery, lithium battery etc. of recharge, and need during use to know that remaining electricity is the need of charging, whether remaining electricity can meet driving requirements.
The existing method controlled the dump energy of accumulator of electric car, has open-circuit voltage mensuration, current accumulation method, but system architecture and control method each different; The accuracy controlled also is distinguished comparatively large, actual use in the electric quantity test directional error that has reach 20-30%, and leave standstill when open-circuit voltage mensuration needs long and just can reach steady state (SS), this brings great inconvenience to the monitoring of the electricity of electric automobile.
Therefore those skilled in the art are devoted to develop a kind of Vehicular battery dump energy monitoring method, can greatly improve the accuracy of monitoring battery dump energy.
Summary of the invention
Because the above-mentioned defect of prior art, technical matters to be solved by this invention be to provide a kind of can the Vehicular battery dump energy monitoring method of accurate measurements battery dump energy.
For achieving the above object, the invention provides a kind of Vehicular battery residual capacity measurement method, comprise the following steps:
Step one, detection cell voltage, battery temperature, charging current and discharge current size;
Step 2, according to battery temperature and charging current, charging current temporally to be accumulated; According to battery temperature and discharge current size, discharge current is temporally accumulated;
Charging current adopts Fixed Time Interval t to accumulate, a charging current signal and temperature signal is gathered every a time interval t, and before (n+1)th time interval, complete the charge capacity accumulation in n-th time interval, until charging terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that charge is Q1, calculating Q1=Wn × t(I
11+ I
12+ I
1n+ I
1n+1); I
1n+1it is the charging current in (n+1)th time interval;
Discharge current adopts Fixed Time Interval t to accumulate, once discharge current signal and temperature signal is gathered every a time interval t, and before (n+1)th time interval, complete the discharge electricity amount accumulation in n-th time interval, until electric discharge terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that discharges is Q2, Q2=Wn × t(I
21+ I
22+ I
2n+ I
2n+1); I
2n+1it is the discharge current in (n+1)th time interval;
Step 3, correction charge capacity;
Setting n-th time interval accumulation electricity carried out that discharges is Q3;
Calculate Q1=K × Q3 and draw Q3=Q1/K; K is the conversion coefficient between Q1 and Q3, K > 1;
The dump energy of step 4, calculating battery;
When after setting charging complete, the residual capacity of battery is Q4, n-th time interval, the residual capacity of battery is Q5; Q5 calculates according to the cell voltage detected and draws;
Calculate Q4=Q3+Q5;
When being set in (n+1)th time interval, the residual capacity of battery is Q6;
Calculate Q6=Q4-Q2=(Q5+Q1/K)-Q2, draw the dump energy of battery.
At the end of once charging completely, current time accumulation charge volume must be had to be greater than a moment cumulative charge, thus to obtain conversion coefficient K.Energy feedback or the midway charging carried out battery of utility grid in short-term, if its charge capacity is Q, the actual electricity that now electric battery receives should be modified to Q/K, instead of Q.This also reduces in short-term accumulation charge capacity on the impact of dump energy, improve the accuracy of dump energy, because the efficiency 1/K of electric battery can not change at short notice, therefore the charge capacity that energy feedback or in short-term utility grid carry out electric battery, adopt the conversion efficiency 1/K of a upper moment cumulative charge to revise their value, dump energy can not be caused to occur error.
Further, the step revising discharge electricity amount is also comprised;
Judge whether the time of Q2=0 reaches setting-up time, when the time of Q2=0 reaches setting-up time and is above, revise the dump energy of present battery further according to the open-circuit voltage values of battery.Because vehicle leaves standstill for a long time, be in steady state (SS), therefore adopt open-circuit voltage values to revise the dump energy of battery further, improve the accuracy of current residual electricity.
Further, the step of the state-of-charge calculating battery dump energy is also comprised;
The state-of-charge of setting battery dump energy is SOC; The rated capacity of setting battery is Q7;
Calculate SOC={(Q5+Q1/K)-Q2}/Q7, draw the state-of-charge of battery dump energy.Due to battery dump energy can be drawn accurately, the state-of-charge SOC(state of charge of the battery dump energy therefore drawn, state-of-charge) also more accurate.
Further, the step judging that whether battery is aging is also comprised after step 5;
Judge whether (Q5+Q1/K)-Q2}/Q7 is less than 1; When (Q5+Q1/K)-Q2}/Q7 is less than 1, then cell degradation.Owing to can judge that whether battery is aging, operating personnel more intuitively can understand battery status accurately.
The invention has the beneficial effects as follows: the present invention have modified the accumulation charge volume of current time, decrease the error of dump energy, improve the accuracy of dump energy, battery charge state more accurately can be drawn, and provide the determination methods of cell degradation simultaneously, make operating personnel can the state of electrolytic cell accurately more directly perceived, bring great convenience to drivers.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory schematic diagram implementing battery check device of the present invention.
Fig. 2 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, a kind of enforcement battery check device of the present invention, comprise battery 1, temperature sensor 2, current sensor 3, voltage transmitter 4 and quantity of electricity controller 5, described temperature sensor 2 is arranged on the surface of battery 1, the output terminal of temperature sensor 2 connects the first input end of described quantity of electricity controller 5, the test side of described current sensor 3 connects the series loop of battery 1, the output terminal of described current sensor 3 connects the second input end of described quantity of electricity controller 5, the positive-negative input end correspondence of described voltage transmitter 4 connects the both positive and negative polarity of battery 1, the output terminal of described voltage transmitter 4 connects the 3rd input end of described quantity of electricity controller 5.
During use, the temperature variation signal of battery is exported to quantity of electricity controller 5 by temperature sensor 2 in real time, the charging current variable signal detected and discharge current variable signal are exported to quantity of electricity controller 5 by current sensor 3, voltage transmitter 4 detects Static Electro cell voltage variable signal when stopping and exports to quantity of electricity controller 5, quantity of electricity controller 5 receives and temperature signal, charging current, discharge current, the voltage signal for the treatment of of battery, and quantity of electricity controller 5 calculates and preserve accumulation charge capacity, accumulated discharge electricity, the dump energy of battery and state-of-charge SOC simultaneously.
As shown in Figure 2, a kind of Vehicular battery residual capacity measurement method, comprises the following steps:
Step one, detection cell voltage, battery temperature, charging current and discharge current size.
Step 2, according to battery temperature and charging current, charging current temporally to be accumulated; According to battery temperature and discharge current size, discharge current is temporally accumulated;
Charging current adopts Fixed Time Interval t to accumulate, a charging current signal and temperature signal is gathered every a time interval t, and before (n+1)th time interval, complete the charge capacity accumulation in n-th time interval, until charging terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that charge is Q1, calculating Q1=Wn × t(I
11+ I
12+ I
1n+ I
1n+1); I
1n+1it is the charging current in (n+1)th time interval;
Discharge current adopts Fixed Time Interval t to accumulate, t is positive number, gathers every a time interval t once discharge current signal and temperature signal, and before (n+1)th time interval, complete the discharge electricity amount accumulation in n-th time interval, until electric discharge terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that discharges is Q2, Q2=Wn × t(I
21+ I
22+ I
2n+ I
2n+1); I
2n+1it is the discharge current in (n+1)th time interval; In this embodiment, t ∈ [10ms, 50ms], M
t∈ [0.004,0.008].
Step 3, judge whether the time of Q2=0 reaches setting-up time, when the time of Q2=0 reaches setting-up time and is above, revise the dump energy of present battery according to the open-circuit voltage values of battery further, when the time of Q2 ≠ 0 or Q2=0 does not reach setting-up time, perform next step.
Step 4, correction charge capacity;
Setting n-th time interval accumulation electricity carried out that discharges is Q3;
Calculate Q1=K × Q3 and draw Q3=Q1/K; K is the conversion coefficient between Q1 and Q3, K > 1.
The dump energy of step 5, calculating battery;
When after setting charging complete, the residual capacity of battery is Q4, n-th time interval, the residual capacity of battery is Q5; Q5 calculates according to the cell voltage detected and draws; The residual capacity calculating battery according to the cell voltage that detects is prior art, and one of ordinary skilled in the art can its implication of accurate understanding, exceeds elaboration at this.
Calculate Q4=Q3+Q5;
When being set in (n+1)th time interval, the residual capacity of battery is Q6;
Calculate Q6=Q4-Q2=(Q5+Q1/K)-Q2, draw the dump energy of battery.
The state-of-charge of step 6, setting battery dump energy is SOC; The rated capacity of setting battery is Q7;
Calculate SOC={(Q5+Q1/K)-Q2}/Q7, draw the state-of-charge of battery dump energy.
Step 7, judge that charging terminates after, whether (Q5+Q1/K)-Q2}/Q7 is less than 1; When (Q5+Q1/K)-Q2}/Q7 is less than 1, then cell degradation.
More than describe preferred embodiment of the present invention in detail.It should be noted that the battery in the present invention can also replace with electric battery, at electric battery each cell surface mounting temperature sensor, can then get the mean value of each temperature sensor as temperature variation signal.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (4)
1. a Vehicular battery dump energy monitoring method, is characterized in that comprising the following steps:
Step one, detection cell voltage, battery temperature, charging current and discharge current size;
Step 2, according to battery temperature and charging current, charging current temporally to be accumulated; According to battery temperature and discharge current size, discharge current is temporally accumulated;
Charging current adopts Fixed Time Interval t to accumulate, a charging current signal and temperature signal is gathered every a time interval t, and before (n+1)th time interval, complete the charge capacity accumulation in n-th time interval, until charging terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that charge is Q1, calculating Q1=Wn × t (I
11+ I
12+ I
1n+ I
1n+1); I
1n+1it is the charging current in (n+1)th time interval;
Discharge current adopts Fixed Time Interval t to accumulate, once discharge current signal and temperature signal is gathered every a time interval t, and before (n+1)th time interval, complete the discharge electricity amount accumulation in n-th time interval, until electric discharge terminates, n is positive integer; According to temperature signal real-time accounting temperature coefficient Wn, Wn=M
t× (T-25); Wherein M
tfor thermal constant, T is the temperature value of battery; Setting (n+1)th time interval electricity accumulated that discharges is Q2, Q2=Wn × t (I
21+ I
22+ I
2n+ I
2n+1); I
2n+1it is the discharge current in (n+1)th time interval;
Step 3, correction discharge electricity amount;
Setting n-th time interval accumulation electricity carried out that discharges is Q3;
Calculate Q1=K × Q3 and draw Q3=Q1/K; K is the conversion coefficient between Q1 and Q3, K > 1;
The dump energy of step 4, calculating battery;
When after setting charging complete, the dump energy of battery is Q4, n-th time interval, the dump energy of battery is Q5; Q5 calculates according to the cell voltage detected and draws;
Calculate Q4=Q3+Q5;
When being set in (n+1)th time interval, the dump energy of battery is Q6;
Calculate Q6=Q4-Q2=(Q5+Q1/K)-Q2, draw the dump energy of battery.
2. Vehicular battery dump energy monitoring method as claimed in claim 1, is characterized in that: the step also comprising the dump energy revising present battery;
Judge whether the time of Q2=0 reaches setting-up time, when the time of Q2=0 reaches setting-up time and is above, revise the dump energy of present battery further according to the open-circuit voltage values of battery.
3. Vehicular battery dump energy monitoring method as claimed in claim 1 or 2, is characterized in that: the step also comprising the state-of-charge calculating battery dump energy;
The state-of-charge of setting battery dump energy is SOC; The rated capacity of setting battery is Q7;
Calculate SOC={ (Q5+Q1/K)-Q2}/Q7, draw the state-of-charge of battery dump energy.
4. Vehicular battery dump energy monitoring method as claimed in claim 1, is characterized in that: also comprise the step judging that whether battery is aging after step 4;
Judge { whether (Q5+Q1/K)-Q2}/Q7 is less than 1; When (Q5+Q1/K)-Q2}/Q7 is less than 1, then cell degradation.
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| CN103997095B (en) * | 2014-06-02 | 2016-05-04 | 国家电网公司 | Boost type batteries module method for obligating |
| US10322634B2 (en) * | 2015-10-14 | 2019-06-18 | Ford Global Technologies, Llc | Estimating battery capacity in an electric vehicle |
| CN105425157A (en) * | 2015-11-09 | 2016-03-23 | 上海天奕无线信息科技有限公司 | Electric quantity metering module group and method for battery, and electric car |
| CN105891723B (en) * | 2016-04-20 | 2018-06-12 | 中国电子科技集团公司第二十九研究所 | It is a kind of based on effectively can charge/discharge capacity battery SOC computational methods |
| CN106771572B (en) * | 2016-12-12 | 2019-09-20 | 深圳市元征科技股份有限公司 | Vehicle electric quantity monitoring method and device |
| CN106872903B (en) * | 2017-02-22 | 2019-09-10 | 重庆长安新能源汽车科技有限公司 | Electric quantity acquisition circuit and method, battery capacity measuring circuit and its measurement method |
| CN107117050B (en) * | 2017-05-10 | 2019-04-16 | 成都环磊科技有限公司 | The monitoring system of electric vehicle remaining capacity |
| CN107340480B (en) * | 2017-06-20 | 2020-05-15 | 北京奥博汽车电子电器有限公司 | Intelligent automobile storage battery sensor |
| CN110045289A (en) * | 2019-03-04 | 2019-07-23 | 安徽力高新能源技术有限公司 | A kind of Work management system for battery self-inspection |
| CN113325325A (en) * | 2021-05-31 | 2021-08-31 | 东风商用车有限公司 | Method and system for calculating residual electric quantity of AGM storage battery of livestock and poultry vehicle |
| CN117712522B (en) * | 2024-02-06 | 2024-05-14 | 双一力(宁波)电池有限公司 | Battery power management method, electronic device and storage medium |
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| JP4259768B2 (en) * | 2001-02-07 | 2009-04-30 | 三洋電機株式会社 | Battery remaining capacity calculation method |
| KR20040056722A (en) * | 2002-12-24 | 2004-07-01 | 현대중공업 주식회사 | Estimation method of battery SOC |
| CN1945345A (en) * | 2005-10-09 | 2007-04-11 | 奇瑞汽车有限公司 | Detecting device and method for mixed power automobile battery remainder |
| CN101303397A (en) * | 2008-06-25 | 2008-11-12 | 河北工业大学 | Method and apparatus for computing lithium ion batteries residual electric energy |
| US7917315B1 (en) * | 2008-08-13 | 2011-03-29 | Southwest Electronic Energy Corporation | Method for determining power supply usage |
| CN102230953B (en) * | 2011-06-20 | 2013-10-30 | 江南大学 | Method for predicting left capacity and health status of storage battery |
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