CN105929336A - Method for estimating state of health of power lithium ion battery - Google Patents
Method for estimating state of health of power lithium ion battery Download PDFInfo
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- CN105929336A CN105929336A CN201610302656.8A CN201610302656A CN105929336A CN 105929336 A CN105929336 A CN 105929336A CN 201610302656 A CN201610302656 A CN 201610302656A CN 105929336 A CN105929336 A CN 105929336A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention relates to the technical field of manufacturing power lithium ion batteries, and in particular to a method for estimating a state of health (SOH) of a power lithium ion battery. The method combines factors from 3 aspects of the power lithium ion battery, namely capacity, power and internal resistance, in evaluating the SOH of the battery. The internal resistor includes a DC internal resistor and an AC internal resistor. The method includes the following steps: conducting full charge and full discharge circulation on the battery, marking a capacity conservation rate as C, testing the AC internal resistor and the DC internal resistor of the battery during circulation tests, defining a ratio of the AC internal resistor ACR to the DC internal resistor as a resistance characteristic value a; at the same time, testing power properties of the battery, making the power conservation rate as P, a health parameter H=aC+aP. According to the invention, the method comprehensively considers the characteristics from 3 aspects, namely capacity, resistance and power, and reflects the health of state of the power lithium ion battery in a more real manner.
Description
Technical field
The present invention relates to lithium ion power manufacturing technology field, be specifically related to a kind of power lithium-ion battery health shape
State evaluation method.
Background technology
In recent years in the face of environmental pollution, the threat of these increasingly serious problems of energy crisis, countries in the world are all adding
Tightly research and develop electric automobile.The electric automobile free of contamination feature of its safety and environmental protection becomes the emphasis of Mirae Corp.'s development,
Wherein the battery as electric powered motor source becomes the bottleneck limiting Development of Electric Vehicles.Battery management system is made
For monitoring and the key of management battery system, managed by charge and discharge balancing, it is ensured that battery system normal occlusion science and engineering
Make, and the health status (SOH) of battery and set of cells is estimated battery management system by battery management system
Manage most important, inputted by the most reasonably health status, the service life of battery system can be improved, with
And improve battery utilization rate.
Summary of the invention
Present invention aim to address above-mentioned the deficiencies in the prior art, it is provided that a kind of power lithium-ion battery health shape
State evaluation method.
The present invention is achieved by the following technical solutions:
A kind of power lithium-ion battery health status evaluation method, comprises the following steps:
(1) battery after partial volume is carried out activation processing；
(2) battery after activating by base current is completely full of puts circulation 1 week, and record initial discharge is held
Amount A1；Further, carry out pulse power test by being completely full of this battery put 1 week, record it at N%SOC
Initial discharge power B under state1；It is full of this electricity put 1 week with full under internal resistance instrument test N%SOC state
The initial AC internal Resistance ACR in pond1；And use mixed pulses power test, record is full is full of this electricity put 1 week
Pond initial DC internal resistance DCR under N%SOC state1；Described base current is the electricity that multiplying power is less than 1C
Stream, 0 < N < 100；
(3) repeat completely to be full of and put circulation, the cell health state H to circulation n weeknEstimate as follows
Calculate:
Wherein, n is natural number, anFor circulating the resistance characteristic value of n week battery, CnFor circulation n week battery
Capability retention, PnFor circulating the power conservation rate of n week battery, ACRnFor circulating the friendship of n week battery
Stream internal resistance value, DCRnFor circulating the DC internal resistance value of n week battery, AnElectric discharge for circulation n week battery is held
Amount, A1For circulating the initial discharge capacity of 1 week battery, BnFor circulating the discharge power of n week battery, B1For
Circulate the initial discharge power of 1 week battery.
A kind of power lithium-ion battery health status evaluation method of the present invention, the work described in step (1)
Change and be processed as battery uses completely full the putting of the electric current less than 1C circulate 5～25 weeks.
A kind of power lithium-ion battery health status evaluation method of the present invention, step (2) described pulse
The concrete grammar of power test is:
Battery after activation is regulated to N%SOC, then with after base current electric discharge certain time, then with greatly
Current pulse discharge is not more than 60s, and the total capacity making base current and high current pulsed discharge is 10%SOC,
Described base current is the electric current that multiplying power is less than 1C, and described big electric current is the electric current that multiplying power is more than 3C,
0 < N < 100, now the computing formula of discharge power B is, B=I × V,
Wherein, the unit of B is that W, I represent big current value, and V represents heavy-current discharge blanking voltage.
A kind of power lithium-ion battery health status evaluation method of the present invention, step (2) described mixing
The concrete grammar of pulse power test is:
After testing the battery standing that AC internal Resistance is in N%SOC electricity state, it is the current discharge of X by multiplying power
It is not more than 60s, stands, be then not more than 60s with the electric current charging that multiplying power is 3/4X, then put by base current
The time of electricity, the electric current making multiplying power be X and current impulse discharge and recharge that multiplying power is 3/4X is equal and total charge and discharge
The discharge capacity of journey is 10%SOC, and described X is more than 3C, and described base current is the electricity that multiplying power is less than 1C
Stream, now the computing formula of DC internal resistance DCR is, DCR=(V0-V1)/I,
Wherein, the unit of DCR is m Ω, V1Represent heavy-current discharge blanking voltage, V0Represent half electricity state electricity
Quiescent voltage after the standing of pond, I represents big current value.
A kind of power lithium-ion battery health status evaluation method of the present invention, the environment of test is all at room temperature
At condition 23 ± 2 DEG C.
A kind of power lithium-ion battery health status evaluation method of the present invention, described power lithium-ion battery
For LFP/C (i.e. LiFePO4/ C) or the battery of NCM/C (i.e. NiCoMn/C) material system.
The beneficial effects of the present invention is:
With the change of the capacity combined in cyclic process, AC impedance, DC impedance and power to electrokinetic cell
Health status estimate, it is contemplated that static, dynamically, capacity and the characteristic of four aspects of power, more truly
Reflection battery health status.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention a kind of power lithium-ion battery health status evaluation method.
Detailed description of the invention
For being best understood from the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, real below
Executing example is only that the present invention will be described rather than is limited it.
As it is shown in figure 1, get the square electric of the IFP20100140-20Ah that 1 partial volume completes from workshop
Pond battery core, is labeled as 1#, and now the state-of-charge of battery core is full electricity state, and health status is estimated according to the following steps
Carry out:
(1) current charge-discharge of above-mentioned battery 6.6A being circulated five weeks activation processing, charging/discharging voltage scope is
2.0-3.7V, standby；
(2) by above-mentioned battery 20A current discharge to 2.0V, discharge capacity is recorded as initial discharge capacity A1,
For 20.17Ah；
(3) charge 30min by above-mentioned battery 20A electric current, and now the SOC state of battery is 50%；Will
Battery connects electric performance test cabinet, after standing 30min, after the current discharge 310s of 20A, uses 100A
Heavy-current discharge 10s, record electric discharge at the end of voltage be 3.105V, calculate initial discharge power
B1(I represents big current value to=I × V=100 × 3.105=310.5 (W), and V represents that heavy-current discharge cuts
Only voltage)；
(4) the initial AC internal Resistance ACR of battery is tested with the internal resistance instrument putting HIOKIBT3562 day1, for
0.73mΩ；
(5) battery after above-mentioned test, connects electric performance test cabinet, after standing 1h, puts with 100A electric current
Stand 40s after electric 10s, after 80A electric current charging 10s, use 20A current discharge 347s, DC internal resistance afterwards
DCR1=(V0-V1)/I=(3.195-3.050)/100/1000=1.45 (m Ω) (V1Represent
100A/10s heavy-current discharge blanking voltage 3.050V, V0Represent the quiescent voltage of half electricity state battery standing 1h
3.195V, I represent the big current value of 100A)；
(6) according to resistance characteristic a=ACR/DCR, can be calculated initial resistance characteristic a1It is 0.503；
(7) according to H=aC+aP, it is calculated initial health H1It is 1.006, is approximately 1；
(8) after battery 20A electric current room temperature is completely full of and puts circulation 50 weeks, all surveys of repeat the above steps
Examination, respectively obtains data below, C50It is 0.997, P50It is 0.986, a50It is 0.501, calculates H50It is 0.997；
Above-mentioned battery is often completely full of with 20A electric current room temperature puts circulation 50 weeks, just repeats the test of (2)-(8)
Step, HnIt is closer to 1 its health status the best.
Put circulation proceed to 2500 weeks along with being completely full of, carry out above-mentioned testing procedure, obtain data below:
C2500It is 0.852, P2500It is 0.723, a2500It is 0.450, calculates H2500It is 0.709.
Can analyze from the data of 2500 weeks, capability retention cannot function as single life estimate standard, merit
The decay of rate performance and the change of resistance characteristic use the later stage bigger on the impact of cell health state at battery.
Full being full of puts circulation when proceeding to 3100 weeks, and testing C value is 0.8, and P value is 0.682, and a value is 0.437,
Calculating cell health state H when cycle life terminates is 0.65.
The above embodiment is only to be described the preferred embodiment of the present invention, not to the present invention
Scope be defined, on the premise of designing spirit without departing from the present invention, those of ordinary skill in the art to this
The various deformation made of technical scheme of invention and improvement, all should fall into the guarantor that claims of the present invention determines
In the range of protecting.
Claims (6)
1. a power lithium-ion battery health status evaluation method, it is characterised in that comprise the following steps:
(1) battery after partial volume is carried out activation processing；
(2) battery after activating by base current is completely full of to be put 1 week, records initial discharge capacity A1；
Further, carry out pulse power test by being completely full of this battery put 1 week, record it under N%SOC state
Initial discharge power B1；At the beginning of full this battery putting 1 week full under internal resistance instrument test N%SOC state
Beginning AC internal Resistance ACR1；And use mixed pulses power test, full this battery put 1 week that is full of of record exists
Initial DC internal resistance DCR under N%SOC state1；Described base current is the electric current that multiplying power is less than 1C,
0<N<100；
(3) repeat completely to be full of and put circulation, the cell health state H to circulation n weeknEstimate as follows
Calculate:
Wherein, n is natural number, anFor circulating the resistance characteristic value of n week battery, CnFor circulation n week battery
Capability retention, PnFor circulating the power conservation rate of n week battery, ACRnFor circulating the friendship of n week battery
Stream internal resistance value, DCRnFor circulating the DC internal resistance value of n week battery, AnElectric discharge for circulation n week battery is held
Amount, A1For circulating the initial discharge capacity of 1 week battery, BnFor circulating the discharge power of n week battery, B1For
Circulate the initial discharge power of 1 week battery.
A kind of power lithium-ion battery health status evaluation method the most according to claim 1, its feature
It is: the activation processing described in step (1) is battery to use the electric current less than 1C be completely full of put circulation 5～25
Week.
A kind of power lithium-ion battery health status evaluation method the most according to claim 1, its feature
Being, the concrete grammar of step (2) described pulse power test is:
Battery after activation is regulated to N%SOC, then with after base current electric discharge certain time, then with greatly
Current pulse discharge is not more than 60s, and the total capacity making base current and high current pulsed discharge is 10%SOC,
Described base current is the electric current that multiplying power is less than 1C, and described big electric current is the electric current that multiplying power is more than 3C,
0 < N < 100, now the computing formula of discharge power B is, B=I × V,
Wherein, the unit of B is that W, I represent big current value, and V represents heavy-current discharge blanking voltage.
A kind of power lithium-ion battery health status evaluation method the most according to claim 1, its feature
Being, the concrete grammar of step (2) described mixed pulses power test is:
After testing the battery standing that AC internal Resistance is in N%SOC electricity state, it is the current discharge of X by multiplying power
It is not more than 60s, stands, be then not more than 60s with the electric current charging that multiplying power is 3/4X, then put by base current
The time of electricity, the electric current making multiplying power be X and current impulse discharge and recharge that multiplying power is 3/4X is equal and total charge and discharge
The discharge capacity of journey is 10%SOC, and described X is more than 3C, and described base current is the electricity that multiplying power is less than 1C
Stream, now the computing formula of DC internal resistance DCR is, DCR=(V0-V1)/I,
Wherein, the unit of DCR is m Ω, V1Represent heavy-current discharge blanking voltage, V0Represent half electricity state electricity
Quiescent voltage after the standing of pond, I represents big current value.
A kind of power lithium-ion battery health status evaluation method the most according to claim 1, its feature
It is: the environment of test is all at normal temperature condition 23 ± 2 DEG C.
A kind of power lithium-ion battery health status evaluation method the most according to claim 1, its feature
It is: described power lithium-ion battery is the battery of LFP/C or NCM/C material system.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443475A (en) * | 2016-10-21 | 2017-02-22 | 国网山东省电力公司电力科学研究院 | Retired power battery dismounting-free reuse screening method based on operation big data |
| CN108023371A (en) * | 2016-11-03 | 2018-05-11 | 舒尔电子(苏州)有限公司 | The storage processing unit and storage processing method of lithium battery |
| CN109856559A (en) * | 2019-02-28 | 2019-06-07 | 武汉理工大学 | A kind of prediction technique of lithium battery cycle life |
| CN109991557A (en) * | 2018-11-30 | 2019-07-09 | 常州车之翼动力科技有限公司 | Dynamic lithium battery cycle life detection method |
| CN110095721A (en) * | 2018-01-30 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of assessment method and model moving back fortune batteries of electric automobile calendar life |
| CN110208701A (en) * | 2019-04-09 | 2019-09-06 | 清华大学 | The calculation method of energy-storage system virtual battery internal resistance in a kind of direct-current micro-grid |
| CN110221224A (en) * | 2019-07-01 | 2019-09-10 | 中兴高能技术有限责任公司 | Prediction technique, device and the storage medium of battery cycle life |
| CN110286326A (en) * | 2018-11-23 | 2019-09-27 | 天津力神电池股份有限公司 | The method of rapid evaluation lithium-ion-power cell pulse power charging and discharging capabilities |
| CN110398693A (en) * | 2019-07-29 | 2019-11-01 | 国网河南省电力公司电力科学研究院 | A kind of retired LiFePO4 single battery state fast appraisement method |
| CN111239629A (en) * | 2020-02-28 | 2020-06-05 | 山东理工大学 | Echelon utilization state interval division method for retired lithium battery |
| WO2020187209A1 (en) * | 2019-03-18 | 2020-09-24 | Oppo广东移动通信有限公司 | Method and apparatus for measuring dc impedance of battery, charging system, and terminal device |
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| CN111812531A (en) * | 2019-04-11 | 2020-10-23 | 东莞新能安科技有限公司 | Battery state detection method, device and storage medium |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443475A (en) * | 2016-10-21 | 2017-02-22 | 国网山东省电力公司电力科学研究院 | Retired power battery dismounting-free reuse screening method based on operation big data |
| CN108023371A (en) * | 2016-11-03 | 2018-05-11 | 舒尔电子(苏州)有限公司 | The storage processing unit and storage processing method of lithium battery |
| CN110095721A (en) * | 2018-01-30 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of assessment method and model moving back fortune batteries of electric automobile calendar life |
| CN110286326A (en) * | 2018-11-23 | 2019-09-27 | 天津力神电池股份有限公司 | The method of rapid evaluation lithium-ion-power cell pulse power charging and discharging capabilities |
| CN109991557A (en) * | 2018-11-30 | 2019-07-09 | 常州车之翼动力科技有限公司 | Dynamic lithium battery cycle life detection method |
| CN109856559A (en) * | 2019-02-28 | 2019-06-07 | 武汉理工大学 | A kind of prediction technique of lithium battery cycle life |
| WO2020187209A1 (en) * | 2019-03-18 | 2020-09-24 | Oppo广东移动通信有限公司 | Method and apparatus for measuring dc impedance of battery, charging system, and terminal device |
| CN110208701B (en) * | 2019-04-09 | 2020-07-10 | 清华大学 | Method for calculating virtual battery internal resistance of energy storage system in direct-current micro-grid |
| CN110208701A (en) * | 2019-04-09 | 2019-09-06 | 清华大学 | The calculation method of energy-storage system virtual battery internal resistance in a kind of direct-current micro-grid |
| CN111812531A (en) * | 2019-04-11 | 2020-10-23 | 东莞新能安科技有限公司 | Battery state detection method, device and storage medium |
| CN110221224A (en) * | 2019-07-01 | 2019-09-10 | 中兴高能技术有限责任公司 | Prediction technique, device and the storage medium of battery cycle life |
| CN110398693A (en) * | 2019-07-29 | 2019-11-01 | 国网河南省电力公司电力科学研究院 | A kind of retired LiFePO4 single battery state fast appraisement method |
| CN111239629A (en) * | 2020-02-28 | 2020-06-05 | 山东理工大学 | Echelon utilization state interval division method for retired lithium battery |
| CN111239629B (en) * | 2020-02-28 | 2022-02-18 | 山东理工大学 | Echelon utilization state interval division method for retired lithium battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
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