CN105929336B - Power lithium ion battery health state estimation method - Google Patents
Power lithium ion battery health state estimation method Download PDFInfo
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- CN105929336B CN105929336B CN201610302656.8A CN201610302656A CN105929336B CN 105929336 B CN105929336 B CN 105929336B CN 201610302656 A CN201610302656 A CN 201610302656A CN 105929336 B CN105929336 B CN 105929336B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000036541 health Effects 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 230000014759 maintenance of location Effects 0.000 claims abstract description 4
- 230000003862 health status Effects 0.000 claims description 21
- 238000011156 evaluation Methods 0.000 claims description 14
- 238000004064 recycling Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- ONUFESLQCSAYKA-UHFFFAOYSA-N iprodione Chemical compound O=C1N(C(=O)NC(C)C)CC(=O)N1C1=CC(Cl)=CC(Cl)=C1 ONUFESLQCSAYKA-UHFFFAOYSA-N 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 210000001367 artery Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012956 testing procedure Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 206010011906 Death Diseases 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910006025 NiCoMn Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
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Abstract
本发明涉及动力锂离子电池制造技术领域，具体涉及一种动力锂离子电池健康状态估算方法。本发明结合动力锂离子电池的容量、功率、内阻三个方面的因素，对电池的SOH进行评测。内阻包含直流内阻和交流内阻，具体的操作方法是，将电池进行满充满放循环，容量保持率记为C，在循环测试的过程中测试电池的交流内阻和直流内阻，交流内阻ACR和直流内阻DCR的比值定义为阻值特性值a；同时测试电池的功率性能，功率保持率记为P，健康参数H=aC+aP。本发明提供的估算方法综合考虑了容量、阻值以及功率三方面的特点，更加真实反映动力锂离子电池的健康状态。
The invention relates to the technical field of power lithium-ion battery manufacturing, in particular to a method for estimating the state of health of a power lithium-ion battery. The present invention evaluates the SOH of the battery by combining the three factors of capacity, power and internal resistance of the power lithium-ion battery. The internal resistance includes DC internal resistance and AC internal resistance. The specific operation method is to perform a full charge and discharge cycle of the battery, and the capacity retention rate is recorded as C. During the cycle test, test the AC internal resistance and DC internal resistance of the battery. The ratio of the internal resistance ACR and the DC internal resistance DCR is defined as the resistance characteristic value a; at the same time, the power performance of the battery is tested, the power retention rate is recorded as P, and the health parameter H=aC+aP. The estimation method provided by the present invention comprehensively considers the three characteristics of capacity, resistance and power, and more truly reflects the health state of the power lithium-ion battery.
Description
Technical field
The present invention relates to lithium ion power manufacturing technology fields, and in particular to a kind of power lithium-ion battery health status is estimated
Calculation method.
Background technique
In recent years in face of environmental pollution, the threat of energy crisis these increasingly serious problems, countries in the world all are stepping up to grind
Generate electricity electrical automobile.The free of contamination feature of its safety and environmental protection becomes the emphasis of Mirae Corp.'s development to electric car, wherein being used as electricity
The battery of electrical automobile power source becomes the bottleneck of limitation Development of Electric Vehicles.Battery management system is as monitoring and management battery system
The key of system guarantees that battery system normal occlusion science and engineering is made by charge and discharge balancing management, and battery management system is to battery and electricity
Health status (SOH) estimation of pond group is most important to the management of battery management system, defeated by accurate reasonable health status
Enter, the service life of battery system can be improved, and improve battery utilization rate.
Summary of the invention
Present invention aim to address above-mentioned the deficiencies in the prior art, a kind of power lithium-ion battery health status is provided and is estimated
Calculation method.
The present invention is achieved by the following technical solutions:
A kind of power lithium-ion battery health status evaluation method, comprising the following steps:
(1) battery after partial volume is activated；
(2) battery after activation is subjected to full be full of with base current and puts circulation 1 week, record initial discharge capacity A1；And
And pulse power test is carried out full of the battery put 1 week by full, record its initial discharge power under N%SOC state
B1；The full initial AC internal Resistance ACR full of the battery for putting 1 week under N%SOC state is tested with internal resistance instrument1；And with mixing arteries and veins
Rush power test, the full initial DC internal resistance DCR for being full of the battery for putting 1 week under N%SOC state of record1；The basis electricity
Stream is the electric current that multiplying power is less than 1C, 0 < N < 100；
(3) it repeats full be full of and puts circulation, to n weeks cell health state H of circulationnIt is estimated as follows:
Wherein, n is natural number, anFor the resistance characteristic value for recycling n weeks battery, CnCapacity for n weeks battery of circulation is kept
Rate, PnFor the power conservation rate for recycling n weeks battery, ACRnFor the internal resistance value for recycling n weeks battery, DCRnTo recycle n weeks battery
DC internal resistance value, AnFor the discharge capacity for recycling n weeks battery, A1For the initial discharge capacity for recycling 1 week battery, BnTo recycle n
The discharge power of all batteries, B1For the initial discharge power for recycling 1 week battery.
A kind of power lithium-ion battery health status evaluation method of the present invention, activation processing described in step (1)
Circulation is put 5~25 weeks to use battery the electric current less than 1C to be completely full of.
A kind of power lithium-ion battery health status evaluation method of the present invention, step (2) pulse power are surveyed
The specific method of examination is:
Battery after activation is adjusted to N%SOC, then after a certain period of time with base current electric discharge, then with high current arteries and veins
Impulse electricity is not more than 60s, makes the total capacity 10%SOC of base current and high current pulsed discharge, and the base current is times
Rate is less than the electric current of 1C, and the high current is the electric current that multiplying power is greater than 3C, 0 < N < 100, the at this time calculation formula of discharge power B
For, B=I × V,
Wherein, the unit of B is W, and I indicates high current value, and V indicates heavy-current discharge blanking voltage.
A kind of power lithium-ion battery health status evaluation method of the present invention, step (2) the mixed pulses function
The specific method of rate test is:
It tests after AC internal Resistance is in the battery standing of N%SOC electricity state, is not more than with the current discharge that multiplying power is X
60s is stood, and the electric current charging for being then 3/4X with multiplying power is not more than 60s, then is discharged with base current, makes the electric current of multiplying power X
The discharge capacity of charge and discharge process equal and total with the time of current impulse charge and discharge that multiplying power is 3/4X is 10%SOC, and the X is big
In 3C, the base current is the electric current that multiplying power is less than 1C, and the calculation formula of DC internal resistance DCR is DCR=(V at this time0-V1)/
I,
Wherein, the unit of DCR is m Ω, V1Indicate heavy-current discharge blanking voltage, V0It is quiet after the electric state battery standing of expression half
State voltage, I indicate high current value.
A kind of power lithium-ion battery health status evaluation method of the present invention, the environment of test is in normal temperature condition
At 23 ± 2 DEG C.
A kind of power lithium-ion battery health status evaluation method of the present invention, the power lithium-ion battery are
LFP/C (i.e. LiFePO4/ C) or NCM/C (i.e. NiCoMn/C) material system battery.
The beneficial effects of the present invention are:
Power battery is good for the variation of the capacity, AC impedance, DC impedance and the power that combine in cyclic process
Health state is estimated, it is contemplated that static state, dynamic, the characteristic of four aspects of capacity and power more really reflect the strong of battery
Health state.
Detailed description of the invention
Fig. 1 is a kind of flow chart of power lithium-ion battery health status evaluation method of the present invention.
Specific embodiment
To be best understood from the present invention, below with reference to embodiment and attached drawing, the invention will be further described, following embodiment
It is only that the present invention will be described rather than is limited to it.
As shown in Figure 1, the rectangular cell battery core for the IFP20100140-20Ah that 1 partial volume is completed is got from workshop,
Labeled as 1#, the state-of-charge of battery core is full electric state at this time, and health status estimation sequentially includes the following steps:
(1) above-mentioned battery is recycled five weeks with the current charge-discharge of 6.6A and is activated, charging/discharging voltage range is 2.0-
3.7V, it is spare；
(2) by above-mentioned battery 20A current discharge to 2.0V, discharge capacity is recorded as initial discharge capacity A1, it is
20.17Ah；
(3) by above-mentioned battery 20A electric current charging 30min, the SOC state of battery is 50% at this time；Battery is connected into electricity
Performance test cabinet, after standing 30min, after the current discharge 310s of 20A, with the heavy-current discharge 10s of 100A, record electric discharge knot
Voltage when beam is 3.105V, calculates initial discharge power B1(I indicates high current to=I × V=100 × 3.105=310.5 (W)
Value, V indicate heavy-current discharge blanking voltage)；
(4) the initial AC internal Resistance ACR of battery is tested with the internal resistance instrument for setting HIOKIBT3562 day1, it is 0.73m Ω；
(5) battery after above-mentioned test connects electric performance test cabinet, after standing 1h, with standing after 100A current discharge 10s
40s uses 20A current discharge 347s, DC internal resistance DCR after using 80A electric current charging 10s afterwards1=(V0-V1)/I=(3.195-
3.050)/100/1000=1.45 (m Ω) (V1Indicate that 100A/10s is large current discharge blanking voltage 3.050V, V0Indicate half electric state
The quiescent voltage 3.195V, I of battery standing 1h indicates 100A high current value)；
(6) according to resistance characteristic a=ACR/DCR, it can be calculated initial resistance characteristic a1It is 0.503；
(7) according to H=aC+aP, initial health H is calculated1It is 1.006, is approximately 1；
(8) battery is completely full of with 20A electric current room temperature put circulation after 50 weeks, all tests to repeat the above steps, respectively
To following data, C50It is 0.997, P50It is 0.986, a50It is 0.501, calculates H50It is 0.997；
Every be completely full of with 20A electric current room temperature of above-mentioned battery puts circulation 50 weeks, just repeats the testing procedure of (2)-(8), HnMore
Close to 1, its health status is better.
Proceed to 2500 weeks with full full of putting circulation, carries out above-mentioned testing procedure, obtain following data: C2500For
0.852, P2500It is 0.723, a2500It is 0.450, calculates H2500It is 0.709.
Data from 2500 weeks can analyze, and capacity retention ratio cannot function as single life estimate standard, power-performance
Decaying and resistance characteristic variation battery using influence of the later period to cell health state it is bigger.
Full full of when putting circulation and proceeding to 3100 weeks, to test C value be 0.8, P value be 0.682, a value is 0.437, and calculating follows
Cell health state H when ring end-of-life is 0.65.
Embodiment described above is only that preferred embodiments of the present invention will be described, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (6)
1. a kind of power lithium-ion battery health status evaluation method, which comprises the following steps:
(1) battery after partial volume is activated；
(2) battery after activation is carried out full be full of with base current to put 1 week, records initial discharge capacity A1；Also, it will completely fill
The battery completely put 1 week carries out pulse power test, records its initial discharge power B under N%SOC state1；With internal resistance instrument
The full initial AC internal Resistance ACR full of the battery for putting 1 week under test N%SOC state1；And with mixed pulses power test,
The full initial DC internal resistance DCR for being full of the battery for putting 1 week under N%SOC state of record1；The base current is that multiplying power is small
In the electric current of 1C, 0 < N < 100；
(3) it repeats full be full of and puts circulation, to n weeks cell health state H of circulationnIt is estimated as follows:
Wherein, n is natural number, anFor the resistance characteristic value for recycling n weeks battery, CnFor the capacity retention ratio for recycling n weeks battery, Pn
For the power conservation rate for recycling n weeks battery, ACRnFor the internal resistance value for recycling n weeks battery, DCRnFor the straight of n weeks battery of circulation
Flow internal resistance value, AnFor the discharge capacity for recycling n weeks battery, A1For the initial discharge capacity for recycling 1 week battery, BnFor n weeks electricity of circulation
The discharge power in pond, B1For the initial discharge power for recycling 1 week battery；HnCloser to 1, its health status is better.
2. a kind of power lithium-ion battery health status evaluation method according to claim 1, it is characterised in that: step
(1) activation processing described in is to use battery the electric current less than 1C to be completely full of to put circulation 5~25 weeks.
3. a kind of power lithium-ion battery health status evaluation method according to claim 1, which is characterized in that step
(2) specific method of the pulse power test is:
Battery after activation is adjusted to N%SOC, then after a certain period of time, then with heavy current pulse is put with base current electric discharge
Electricity is not more than 60s, makes the total capacity 10%SOC of base current and high current pulsed discharge, and the base current is that multiplying power is small
In the electric current of 1C, the high current is the electric current that multiplying power is greater than 3C, and 0 < N < 100, the calculation formula of discharge power B is B=at this time
I × V,
Wherein, the unit of B is W, and I indicates high current value, and V indicates heavy-current discharge blanking voltage.
4. a kind of power lithium-ion battery health status evaluation method according to claim 1, which is characterized in that step
(2) specific method of the mixed pulses power test is:
It tests after AC internal Resistance is in the battery standing of N%SOC electricity state, is not more than 60s with the current discharge that multiplying power is X, it is quiet
It sets, the electric current charging for being then 3/4X with multiplying power is not more than 60s, then is discharged with base current, makes the electric current and multiplying power of multiplying power X
Time for the current impulse charge and discharge of 3/4X is equal and the discharge capacity of total charge and discharge process is 10%SOC, and the X is greater than 3C,
The base current is the electric current that multiplying power is less than 1C, and the calculation formula of DC internal resistance DCR is DCR=(V at this time0-V1)/I,
Wherein, the unit of DCR is m Ω, V1Indicate heavy-current discharge blanking voltage, V0Static Electro after the electric state battery standing of expression half
Pressure, I indicate high current value.
5. a kind of power lithium-ion battery health status evaluation method according to claim 1, it is characterised in that: test
Environment is at 23 ± 2 DEG C of normal temperature condition.
6. a kind of power lithium-ion battery health status evaluation method according to claim 1, it is characterised in that: described dynamic
Power lithium ion battery is the battery of LFP/C or NCM/C material system.
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| 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 |
| CN108023371B (en) * | 2016-11-03 | 2021-07-27 | 舒尔电子(苏州)有限公司 | Lithium battery storage processing device and storage processing 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 |
| 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 |
| CN109856559B (en) * | 2019-02-28 | 2021-10-22 | 武汉理工大学 | A method for predicting the cycle life of lithium batteries |
| CN111722134B (en) * | 2019-03-18 | 2021-08-24 | Oppo广东移动通信有限公司 | Method and apparatus for measuring DC impedance of battery, charging system and terminal equipment |
| CN110208701B (en) * | 2019-04-09 | 2020-07-10 | 清华大学 | A calculation method of virtual battery internal resistance of energy storage system in DC microgrid |
| CN111812531B (en) * | 2019-04-11 | 2023-04-07 | 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 rapid evaluation method for the state of decommissioned lithium iron phosphate single battery |
| CN111239629B (en) * | 2020-02-28 | 2022-02-18 | 山东理工大学 | A state interval division method for echelon utilization of retired lithium batteries |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | A method for screening abnormal self-discharge batteries |
| CN115061044B (en) * | 2022-07-04 | 2025-01-14 | 北京电满满科技有限公司 | Lithium battery health assessment method and system based on BMS communication detection technology |
| CN115421050A (en) * | 2022-10-12 | 2022-12-02 | 中国电力科学研究院有限公司 | Method, system, device and storage medium for estimating battery state of health |
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| US9244132B2 (en) * | 2011-09-12 | 2016-01-26 | Eaglepicher Technologies, Llc | Systems and methods for determining battery state-of-health |
| CN103558556B (en) * | 2013-10-31 | 2016-02-03 | 重庆长安汽车股份有限公司 | A kind of power battery SOH estimation method |
| CN103869256B (en) * | 2014-03-27 | 2017-02-15 | 华南师范大学 | Method for estimating SOH of power lithium ion battery based on alternating current impedance test |
| CN104749533B (en) * | 2015-03-25 | 2018-04-06 | 上海应用技术学院 | A kind of health state of lithium ion battery estimation on line method |
| CN105301509B (en) * | 2015-11-12 | 2019-03-29 | 清华大学 | The combined estimation method of charge states of lithium ion battery, health status and power rating |
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