CN102221678A - On-line life calculation method for battery system - Google Patents
On-line life calculation method for battery system Download PDFInfo
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- CN102221678A CN102221678A CN2011101275544A CN201110127554A CN102221678A CN 102221678 A CN102221678 A CN 102221678A CN 2011101275544 A CN2011101275544 A CN 2011101275544A CN 201110127554 A CN201110127554 A CN 201110127554A CN 102221678 A CN102221678 A CN 102221678A
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Abstract
The invention provides an on-line life calculation method for a battery system. The on-line life calculation method for the battery system provided by the invention comprises the following three steps: inputting the total energy of charging and discharging of the battery system during the entire life process; calculating the total energy of the finished charging and discharging of the batter system at the moment; and utilizing the two energies to obtain an on-line life of the battery system. Compared with the existing calculation method, the on-line life calculation method for the battery system provided by the invention has the following two advantages: few input parameters are needed for calculating the on-line life and the parameters can be collected by a simple device, namely, the battery system can be carried out the on-line life calculation simply by calculating the total energy of charging and discharging of the battery system; and meanwhile, the calculation process is relatively simple and can be realized without the complicated software and hardware devices.
Description
Technical field
The invention belongs to the battery system field of new-energy automobile, relate in particular to the online Life Calculation method of a kind of battery system.
Background technology
Energy shortage and environmental pollution are the great difficult problems that the whole world faces, and making full use of clean energy resource is the effective way of alleviating this problem.Development energy-saving and environmental protection automobile has become the important directions of world car industrial technology innovation and the inevitable choice of automobile industry sustainable development.The battery system complexity is higher, design difficulty is big, is the bottleneck that this technology of restriction is applied to New-energy electric vehicle always.
The electrokinetic cell type that is applied at present on the new-energy automobile has: lead-acid accumulator, Ni-MH battery, nickel-cadmium battery and lithium battery.Lithium battery because have that volume is little, energy density is high, storage life is long, premium properties such as memory-less effect, high voltage and self-discharge rate are low, will replace lead-acid battery, Ni-MH battery, become the winner of electrokinetic cell.
Battery is the electro-chemical systems of a complexity, its deterioration failure mechanism complexity, and deterioration mode is subjected to all multifactor impacts, is difficult to reflect with general model.The battery monitoring device that uses in a lot of occasions just detects the float charge voltage data, find by real work, relying on simple floating charge state data to come the deterioration state of accurate estimating battery is very difficult thing, therefore the obstacle that utilizes the floating charge data modeling also just to run into.It is the important information that battery performance degenerates that internal resistance changes, but internal resistance value can not strict corresponding degradation, can only be as a reference.The degradation of battery system is very important to producing and studying, and therefore must propose a kind of effective method comes the online life-span of counting cell system.
In order to improve the accuracy of the online Life Calculation of battery system, prevent to the present invention proposes the online Life Calculation method of a kind of battery system because of the battery system degradation causes heavy losses to producing research.
In existing patent, pair associated description of the online life prediction of battery system was also once arranged, as practical New Name the method and apparatus (patent No. 200680022995.5) of estimating state of health of battery.This patent is the apparatus and method of the health status of resistance estimating battery in utilizing, and has had been found that interior resistance is as the parameter that cell health state is applied maximum effect.Evaluation method comprises the steps: the SOH estimating table is stored in the storer, described SOH estimating table set up with according to the corresponding health status value of resistance value in temperature and charged state (SOC) various; When proposing the request of estimating state of health of battery, carry out the estimation of temperature survey and battery SOC; Detect the interior resistance value of battery; And the corresponding cell health state value of battery internal resistance value that reads and measure temperature, the battery SOC of being estimated and detected from described SOH estimating table.
And for example the patent of invention name is called the diagnostic method (patent No. 200610078848) of cell health state, and this patent diagnoses to cell health state that to comprise step as follows: sparking voltage and discharge current data that a battery is provided; Set the acceptable value of a preset time interval and this preset time interval discharge current variable quantity; Analyze the interior sparking voltage of this preset time interval and the variation of discharge current data; Write down this sparking voltage, discharge current data and delta data thereof; This discharge voltage data of comparison and delta data thereof in the acceptable value of discharge current variable quantity; Reaching comparison result shows is health status diagnosis pointer.
Compare with existing patent, the online Life Calculation method of the described a kind of battery system of this patent only just can be calculated the online life-span of battery system by the total amount of charging of counting cell system and discharge energy.And workload that the SOH estimating table that needs in the patent of the method and apparatus of above-mentioned estimating state of health of battery obtains and difficulty are all bigger, and the de-stabilising effect factor that is subjected to is many.Particularly when the deterioration of battery degree is relatively more serious, need more difficult the obtaining of data of gathering.In the patent of the diagnostic method of above-mentioned cell health state, the acceptable value how the discharge current variable quantity accurately is set is relatively more difficult, and the difference that acceptable value is selected affects greatly the diagnosis of cell health state.And this patent charges by simple counting cell system accurately and the total amount of discharge energy can realize the online life-span of battery system is calculated easily.
Summary of the invention
The present invention is directed to existing technological deficiency, provide a kind of battery system online Life Calculation method, the total amount by charging of counting cell system and discharge energy can realize the online Life Calculation of battery system easily.
The technical matters that the present invention further will solve is: the factors of considering how to reduce under self-discharge of battery, the different temperatures such as battery capacity variation are calculated the influence that causes to charge-discharge energy, thereby the online life-span of battery system is calculated more accurately.
The present invention specifically by the following technical solutions.
The online Life Calculation method of a kind of battery system, this method is by calculating the each charging of battery system and discharge energy and adding up, with the total amount of current charging of having finished of battery system and discharge energy and battery system charges in whole life and the total amount of discharge energy compares, thereby draw the online life-span of battery system; It is characterized in that the step of described method is as follows:
(1), calculates and charge in the battery system process in whole serviceable life and the total amount Q of discharge energy according to dispatching from the factory rated capacity (C) and two parameters of cycle index (N) of parameter acquiring battery system
00=C * N * 2;
(2) be that the total current that flows out battery system in the discharge process is carried out integration to the total current that in charging process, flows into battery system and in the battery system duty, and with integration institute value as this charge or discharge energy of battery system Q
n, described energy
, wherein,
Be the total current in battery system charging process or the discharge process;
(3) with this charge or discharge energy of battery system Q
nThis charging finished before discharging and recharging and the total amount addition of discharge energy with battery system, thus the total amount Q of battery system charging at present and discharge energy obtained
01=Q
1+ Q
2+ ... + Q
n
(4) the total amount Q of charging and discharge energy in the battery system process in whole serviceable life that obtains according to step (1)
00And the total amount Q of charging at present of the battery system that obtains of step (3) and discharge energy
01, calculate battery system
The online Life Calculation method of a kind of battery system that the present invention proposes is compared with existing computing method, has following two advantages:
It is few and just can collect by simple mechanism that needed input parameter of online life-span is calculated in this invention, promptly only charges by the counting cell system and the total amount of discharge energy just can be calculated the online life-span of battery system.
The computation process of this invention is fairly simple, does not need very complicated soft hardware equipment just can realize.
Description of drawings
The online Life Calculation method of the battery system overall flow figure that Fig. 1 proposes for the present invention;
Fig. 2 is for calculating the process flow diagram of each charging of battery system and discharge energy in the online Life Calculation method of battery system of the present invention's proposition;
Fig. 3 is for calculating the process flow diagram of current charging of having finished of battery system and discharge energy summation in the online Life Calculation method of battery system of the present invention's proposition.
Embodiment
The online Life Calculation method of battery system that the present invention proposes is made up of following three parts: 1, the input battery system charges and the discharge energy summation in whole life; 2, current charging of having finished of counting cell system and discharge energy summation; 3, utilize above two energy to be divided by and obtain the online life-span of battery system.
Described input battery system in whole life, charge and the discharge energy summation by obtaining battery rated capacity and two parameters of cycle index of getting of marking of dispatching from the factory, thereby can calculate charging and discharge energy summation in the battery system process in whole serviceable life;
Current charging of having finished of described counting cell system and discharge energy summation, the total current that at first flows into when discharging and recharging at every turn or flow out battery system is carried out integration, and with integration institute value as battery system this electric weight that discharges and recharges, and then the counting cell system current finished all the charging and discharge energy summations;
Above two energy of described utilization are divided by and obtain the online life-span of battery system, are to account for that battery system charges and the ratio of discharge energy summation obtains online life-span of battery system in whole life by current charging of having finished of counting cell system and discharge energy summation.
Below in conjunction with accompanying drawing the online Life Calculation method of battery system is described further.
Fig. 1 is the online Life Calculation method of battery system overall flow figure, this method is at first charged and the discharge energy summation in the whole life of counting cell system, by the total current of each inflow and outflow battery system is carried out integration and added up current charging of having finished of counting cell system and discharge energy summation, predict the online life-span of battery system then by the ratio of above two energy summations.Concrete steps are as follows:
(1), calculates and charge in the battery system process in whole serviceable life and the total amount Q of discharge energy according to dispatching from the factory rated capacity (C) and two parameters of cycle index (N) of parameter acquiring battery system
00=C * N * 2;
(2) be that the total current that flows out battery system in the discharge process is carried out integration to flowing into battery system and battery system duty in the charging process, and with integration institute value as this charge or discharge energy of battery system Q
n, described energy
, wherein,
Be the total current in battery system charging process or the discharge process;
(3) with this charge or discharge energy of battery system Q
nThis charging finished before discharging and recharging and the total amount addition of discharge energy with battery system, thus the total amount Q of battery system charging at present and discharge energy obtained
01=Q
1+ Q
2+ ... + Q
n
(4) the total amount Q of charging and discharge energy in the battery system process in whole serviceable life that obtains according to step (1)
00And the total amount Q of charging at present of the battery system that obtains of step (3) and discharge energy
01, calculate the online life-span of battery system
Fig. 2 is for calculating each charging of battery system and discharge energy process flow diagram in the online Life Calculation method of battery system of the present invention's proposition.General thought is that the total current of inflow or outflow battery system is carried out integration, and with the resulting numerical value of the integration energy Q that this (the n time) discharges and recharges as battery system
n, specific implementation is: total current in the circuit when detection battery system discharges and recharges work
, will
Become digital quantity (CR) by analog to digital conversion (ADC), the speed of determining with time base adds up afterwards, and (it is right to be equivalent to
Carry out integration), accumulation result (ACR) is the charge-discharge energy Q of unit through promptly obtaining with the ampere-hour after converting
n, energy theorem is:
Analog to digital conversion result and add up after the result all have sign bit, according to the difference of module connected mode and difference.Can read the ACR value and after converting, obtain real charge-discharge energy Q by microcontroller
n
Fig. 3 is for calculating current charging of having finished of battery system and discharge energy summation process flow diagram in the online Life Calculation method of battery system of the present invention's proposition, with this (the n time) of battery system charging and discharge energy Q
nThis charging finished before discharging and recharging and the total amount addition of discharge energy with battery system obtain battery system up-to-date charging and discharge energy summation Q at present
01
Claims (1)
1. online Life Calculation method of battery system, this method is by calculating the each charging of battery system and discharge energy and adding up, with the total amount of current charging of having finished of battery system and discharge energy and battery system charges in whole life and the total amount of discharge energy compares, thereby draw the online life-span of battery system; It is characterized in that the step of described method is as follows:
(1), calculates and charge in the battery system process in whole serviceable life and the total amount Q of discharge energy according to dispatching from the factory rated capacity (C) and two parameters of cycle index (N) of parameter acquiring battery system
00=C * N * 2;
(2) be that the total current that flows out battery system in the discharge process is carried out integration to the total current that in charging process, flows into battery system and in the battery system duty, and with integration institute value as this charge or discharge energy of battery system Q
n, described energy
, wherein,
Be the total current in battery system charging process or the discharge process;
(3) with this charge or discharge energy of battery system Q
nThis charging finished before discharging and recharging and the total amount addition of discharge energy with battery system, thus the total amount Q of battery system charging at present and discharge energy obtained
01=Q
1+ Q
2+ ... + Q
n
(4) the total amount Q of charging and discharge energy in the battery system process in whole serviceable life that obtains according to step (1)
00And the total amount Q of charging at present of the battery system that obtains of step (3) and discharge energy
01, calculate the online life-span of battery system
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721926A (en) * | 2012-03-02 | 2012-10-10 | 友达光电股份有限公司 | Method for evaluating health state of battery cell |
| CN105158699A (en) * | 2015-09-14 | 2015-12-16 | 北京新能源汽车股份有限公司 | Battery health state detection method and apparatus |
| CN106154163A (en) * | 2015-03-12 | 2016-11-23 | 重庆邮电大学 | Battery life state identification method |
| CN107607875A (en) * | 2017-08-15 | 2018-01-19 | 北京智行鸿远汽车有限公司 | Lithium battery SOH methods of estimation based on cycle-index statistics |
| CN109613445A (en) * | 2018-12-28 | 2019-04-12 | 蜂巢能源科技有限公司 | A kind of method and apparatus of the health status of estimated driving force battery |
| CN110673036A (en) * | 2019-07-24 | 2020-01-10 | 广州中国科学院计算机网络信息中心 | Vehicle fault early warning method and system based on OBD computing technology |
| CN113589188A (en) * | 2021-08-12 | 2021-11-02 | 湖北亿纬动力有限公司 | Battery life evaluation method, device and system |
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| CN101634687A (en) * | 2008-07-23 | 2010-01-27 | 比亚迪股份有限公司 | Method for measuring SOC value of battery of hybrid vehicle |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721926A (en) * | 2012-03-02 | 2012-10-10 | 友达光电股份有限公司 | Method for evaluating health state of battery cell |
| CN102721926B (en) * | 2012-03-02 | 2014-08-27 | 友达光电股份有限公司 | Method for evaluating health state of battery cell |
| CN106154163A (en) * | 2015-03-12 | 2016-11-23 | 重庆邮电大学 | Battery life state identification method |
| CN106154163B (en) * | 2015-03-12 | 2019-03-26 | 重庆邮电大学 | Battery life state identification method |
| CN105158699A (en) * | 2015-09-14 | 2015-12-16 | 北京新能源汽车股份有限公司 | Battery health state detection method and apparatus |
| CN105158699B (en) * | 2015-09-14 | 2018-05-25 | 北京新能源汽车股份有限公司 | The detection method and device of cell health state |
| CN107607875A (en) * | 2017-08-15 | 2018-01-19 | 北京智行鸿远汽车有限公司 | Lithium battery SOH methods of estimation based on cycle-index statistics |
| CN109613445A (en) * | 2018-12-28 | 2019-04-12 | 蜂巢能源科技有限公司 | A kind of method and apparatus of the health status of estimated driving force battery |
| CN109613445B (en) * | 2018-12-28 | 2021-05-25 | 蜂巢能源科技有限公司 | Method and device for estimating state of health of power battery |
| CN110673036A (en) * | 2019-07-24 | 2020-01-10 | 广州中国科学院计算机网络信息中心 | Vehicle fault early warning method and system based on OBD computing technology |
| CN113589188A (en) * | 2021-08-12 | 2021-11-02 | 湖北亿纬动力有限公司 | Battery life evaluation method, device and system |
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Application publication date: 20111019 |