CN106199452A - A kind of power lithium-ion battery functional status evaluation method - Google Patents
A kind of power lithium-ion battery functional status evaluation method Download PDFInfo
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- CN106199452A CN106199452A CN201610720267.7A CN201610720267A CN106199452A CN 106199452 A CN106199452 A CN 106199452A CN 201610720267 A CN201610720267 A CN 201610720267A CN 106199452 A CN106199452 A CN 106199452A
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- lithium battery
- functional status
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- rate
- internal resistance
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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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- 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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
Abstract
The invention discloses the evaluation method of a kind of power lithium-ion battery functional status, it includes using the electric current less than 1C that the lithium battery after partial volume is carried out discharge and recharge operation, surveys its weight, AC internal Resistance, thickness and outward appearance scoring；Again discharge, detect to obtain its discharge capacity and discharge energy；When lithium battery be discharged to its dump energy be 30 80% time, test its power with mixed pulses power testing method and obtain power density；Again it completely filled, completely put circulation, and after often circulating 100 weeks repeat the above steps operation till its functional status SOF is less than 0.6, and record numerical value measured by operation every time respectively；Weighted mean method is used to obtain the functional status of lithium battery.By the assessment of battery functi on state, scent a hidden danger ahead of time, make maintenance and the use of defensive measure targetedly, beneficially battery.
Description
Technical field
The present invention relates to technical field of lithium ion, be specifically related to a kind of power lithium-ion battery functional status estimation side
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 ground stepping up
Generating electrical automobile.Electric automobile becomes the emphasis of Mirae Corp.'s development, but wherein conduct with the free of contamination feature of its safety and environmental protection
The battery in electric powered motor source becomes the bottleneck limiting Development of Electric Vehicles.Battery management system is as monitoring and management battery
The key of system, is managed by charge and discharge balancing, it is ensured that battery system normal occlusion science and engineering is made, and battery management system to battery and
Functional status (SOF) estimation of set of cells is most important to the management of battery management system, by the most reasonably functional status
Input, can improve the service life of battery system, and improves battery utilization rate.
Summary of the invention
The technical problem to be solved in the present invention is to provide the evaluation method of a kind of power lithium-ion battery functional status.
The technical solution used in the present invention is:
A kind of evaluation method of power lithium-ion battery functional status, it comprises the following steps:
(1) use the electric current less than 1C that the lithium battery after partial volume carries out discharge and recharge operation, and completely fill, completely put circulation five
Week；
(2) weight of lithium battery after step (1) processes, AC internal Resistance, thickness and outward appearance scoring are detected respectively；
(3) lithium battery after step (2) detects is discharged again, detect to obtain its discharge capacity and discharge energy number
Value；
(4) when lithium battery be discharged to its dump energy be 30-80% time, with mixed pulses power testing method (HPPC) survey
Try its power, then this performance number is obtained power density divided by the weight of lithium battery；
(5) after lithium battery dump energy being discharged, then it is completely filled, completely puts circulation, and repeat after often circulating 100 weeks
Above-mentioned steps (2)-(4) operation is till its functional status SOF is less than 0.6, and records the lithium measured by every time operating respectively
The scoring of battery weight, AC internal Resistance, thickness, outward appearance, discharge capacity, discharge energy and the numerical value of power density；
(6) increase relative to increment rate D of thickness of lithium battery, internal resistance during previous detection when calculating detection every time respectively
Rate R, capability retention C, energy conservation rate Q and power conservation rate P, particularly as follows:
The increment rate of thicknessWherein n represents the number of times of detection；Dn, Dn+1 represent twice inspection respectively
The thickness of the lithium battery surveyed；
Internal resistance increase rateWherein n represents the number of times of detection；Rn、Rn+1Represent twice detection respectively
The AC internal Resistance of lithium battery；
Capability retentionWherein n represents the number of times of detection；Cn、Cn+1Represent the lithium battery of twice detection respectively
Discharge capacity；
Energy conservation rateWherein n represents the number of times of detection；Qn、Qn+1Represent the lithium battery of twice detection respectively
Discharge energy；
Power conservation rateWherein n represents the number of times of detection；Pn、Pn+1Represent the lithium battery of twice detection respectively
Power density；
(7) use weighted mean method, calculate the functional status SOF of lithium battery as follows,
SOF=(C+R+P+Q+D+W)/6
In formula: SOF is functional status, C is capability retention, and R is internal resistance increase rate, and P is power conservation rate, and Q is energy
Conservation rate, D be thickness increment rate, W be outward appearance scoring.
Further scheme, the scoring of described outward appearance refers to observe the outward appearance of lithium battery with microscope, complete appearance without
Damaged is designated as 1, has breakage then functional status SOF to be assessed as 0；
When capability retention is down to the 80% of capability retention first, then functional status SOF is assessed as 0；
When power conservation rate is down to the 50% of power conservation rate first, then functional status SOF is assessed as 0；
When internal resistance increase rate is down to the 50% of internal resistance increase rate fall first, then functional status SOF is assessed as 0；
When thickness increment rate is down to the 30% of thickness increment rate first, then functional status SOF is assessed as 0.
Scheme further, the discharge and recharge operation of lithium battery and lithium battery weight, AC internal Resistance, thickness, outward appearance scoring, electric discharge
The detection of capacity, discharge energy and power density is all carried out at a temperature of 23 ± 2 DEG C.
The present invention is by marking and discharge capacity, electric discharge energy to the quality of lithium battery, thickness, internal resistance increase rate, outward appearance
The detection of amount, then calculate capability retention, internal resistance increase rate, power conservation rate, energy conservation rate, thickness increment rate respectively；
Thus draw the functional status SOF of lithium battery, thus improve the service life of battery system, and improve battery utilization rate.
The invention has the beneficial effects as follows:
The present invention is by capability retention, internal resistance increase rate, power conservation rate, energy conservation rate, thickness increment rate and outer
See the structure of these six functional status appraising models of marking, breach current single capacity as judging power lithium-ion battery
The present situation of state, thus reflect the functional status of lithium battery more really, providing for Li-ion Battery Management System can
The data basis leaned on, estimates the comprehensive state of battery system more really, brings preferably driving to new-energy automobile user
Experience.
By the assessment to battery functi on state, battery can be obtained from capacity, energy, power, resistance and outward appearance and knot
Functional status level in terms of component, scents a hidden danger ahead of time, makes defensive measure targetedly, thus the maintenance of beneficially battery
And use.
Detailed description of the invention
Embodiment 1:
A kind of evaluation method of power lithium-ion battery functional status, it comprises the following steps:
(1) use the electric current less than 1C that the lithium battery after partial volume carries out discharge and recharge operation, and completely fill, completely put circulation five
Week；
(2) weight of lithium battery after step (1) processes, AC internal Resistance, thickness and outward appearance scoring are detected respectively；
(3) lithium battery after step (2) detects is discharged again, detect to obtain its discharge capacity and discharge energy number
Value；
(4) when lithium battery be discharged to its dump energy be 30-80% time, with mixed pulses power testing method (HPPC) survey
Try its power, then this performance number is obtained power density divided by the weight of lithium battery；
(5) after lithium battery dump energy being discharged, then it is completely filled, completely puts circulation, and repeat after often circulating 100 weeks
Above-mentioned steps (2)-(4) operation is till its functional status SOF is less than 0.6, and records the lithium measured by every time operating respectively
The scoring of battery weight, AC internal Resistance, thickness, outward appearance, discharge capacity, discharge energy and the numerical value of power density；
(6) increase relative to increment rate D of thickness of lithium battery, internal resistance during previous detection when calculating detection every time respectively
Rate R, capability retention C, energy conservation rate Q and power conservation rate P, particularly as follows:
The increment rate of thicknessWherein n represents the number of times of detection；Dn, Dn+1 represent twice inspection respectively
The thickness of the lithium battery surveyed；
Internal resistance increase rateWherein n represents the number of times of detection；Rn、Rn+1Represent twice detection respectively
The AC internal Resistance of lithium battery；
Capability retentionWherein n represents the number of times of detection；Cn、Cn+1Represent the lithium battery of twice detection respectively
Discharge capacity；
Energy conservation rateWherein n represents the number of times of detection；Qn、Qn+1Represent the lithium battery of twice detection respectively
Discharge energy；
Power conservation rateWherein n represents the number of times of detection；Pn、Pn+1Represent the lithium battery of twice detection respectively
Power density；
(7) use weighted mean method, calculate the functional status SOF of lithium battery as follows,
SOF=(C+R+P+Q+D+W)/6
In formula: SOF is functional status, C is capability retention, and R is internal resistance increase rate, and P is power conservation rate, and Q is energy
Conservation rate, D be thickness increment rate, W be outward appearance scoring.
Further scheme, the scoring of described outward appearance refers to observe the outward appearance of lithium battery with microscope, complete appearance without
Damaged is designated as 1, has breakage then functional status SOF to be assessed as 0；
When capability retention is down to the 80% of capability retention first, then functional status SOF is assessed as 0；
When power conservation rate is down to the 50% of power conservation rate first, then functional status SOF is assessed as 0；
When internal resistance increase rate is down to the 50% of internal resistance increase rate fall first, then functional status SOF is assessed as 0；
When thickness increment rate is down to the 30% of thickness increment rate first, then functional status SOF is assessed as 0.
Scheme further, the discharge and recharge operation of lithium battery and lithium battery weight, AC internal Resistance, thickness, outward appearance scoring, electric discharge
The detection of capacity, discharge energy and power density is all carried out at a temperature of 23 ± 2 DEG C.
Embodiment 2:
(1) the rectangular cell battery core of the IFP20100140-20Ah that 1 partial volume completes, now battery core is got from workshop
State-of-charge be full electricity state；Circulating five weeks with the current charge-discharge of 0.1C (6.6A), charging/discharging voltage scope is 2.0-3.7V, standby
With；
(2) quality detecting this battery core is 439.5g, and thickness is 20.12mm, and AC internal Resistance value is 0.65m Ω, outside range estimation
Seeing good, observe without damaged with microscope, recording its apparent condition is 1.0 points；
(3) with 20A current discharge to 2.0V, survey now discharge capacity be 20170mAh, discharge energy be 64.544Wh；
(4) by the half of 20A current discharge to electricity, recording its open-circuit voltage OCV after standing 1 hour is 3286.8mV；
Then 100A current discharge is used 10 seconds, the voltage V at the end of record electric discharge1For 2660.5mV, then survey according to mixed pulses power
Method for testing records power=[(OCV-2000) * 2*I/ (OCV-V1)], the value calculating gained is 410.9193W, divided by quality
439.5g draw power density P0For 934.97W/KG；
(5) the most completely fill with 1C, completely put and be circulated again, repeated (2), (3), (4) step at interval of 100 weeks, directly
To functional status SOF less than less than 0.6, it is functional status and is unsatisfactory for using requirement.And record operation every time is measured respectively
Lithium battery weight, AC internal Resistance, thickness, outward appearance scoring, discharge capacity, discharge energy and the numerical value of power density, such as table 1 institute
Show；
1,5 weeks test data of table:
(6) according to the data in table 1, the thickness of lithium battery when detecting relative to previous time when calculating detection every time respectively
Increment rate D, internal resistance increase rate R, capability retention C, energy conservation rate Q and power conservation rate P, particularly as follows:
The increment rate of thicknessWherein n represents the number of times of detection；Dn, Dn+1 represent twice inspection respectively
The thickness of the lithium battery surveyed；
Internal resistance increase rateWherein n represents the number of times of detection；Rn、Rn+1Represent twice detection respectively
The AC internal Resistance of lithium battery；
Capability retentionWherein n represents the number of times of detection；Cn、Cn+1Represent the lithium battery of twice detection respectively
Discharge capacity；
Energy conservation rateWherein n represents the number of times of detection；Qn、Qn+1Represent the lithium battery of twice detection respectively
Discharge energy；
Power conservation rateWherein n represents the number of times of detection；Pn、Pn+1Represent the lithium battery of twice detection respectively
Power density；And be reported in Table 2 below；
(7) use weighted mean method, calculate the functional status SOF of lithium battery as follows,
SOF=(C+R+P+Q+D+W)/6
In formula: SOF is functional status, C is capability retention, and R is internal resistance increase rate, and P is power conservation rate, and Q is energy
Conservation rate, D be thickness increment rate, W be outward appearance scoring.
Table 2 data process
Data from table 2, it can be deduced that to draw a conclusion:
1, single capability retention can not truly reflect the truth function state of power lithium-ion battery；
2, internal resistance increase rate is big compared with the parameter of other several modules；
3, thickness increment rate and outward appearance are accumulative decisive parameters；
4, functional status is relatively close to energy conservation rate and power conservation rate state, i.e. thinks that energy conservation rate and power are protected
Holdup is close to the actually used parameter of power lithium-ion battery.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all former in the present invention
Amendment, equivalent and the improvement etc. made within then, should be included within the scope of the present invention.
Claims (3)
1. the evaluation method of a power lithium-ion battery functional status, it is characterised in that: comprise the following steps:
(1) use the electric current less than 1C that the lithium battery after partial volume carries out discharge and recharge operation, and completely fill, completely put circulation five weeks；
(2) weight of lithium battery after step (1) processes, AC internal Resistance, thickness and outward appearance scoring are detected respectively；
(3) lithium battery after step (2) detects is discharged again, detect to obtain its discharge capacity and discharge energy numerical value；
(4) when lithium battery be discharged to its dump energy be 30-80% time, test it with mixed pulses power testing method (HPPC)
Power, then obtains power density by this performance number divided by the weight of lithium battery；
(5) after lithium battery dump energy being discharged, then it is completely filled, completely puts circulation, and repeat after often circulating 100 weeks above-mentioned
Step (2)-(4) operation is till its functional status SOF is less than 0.6, and records the lithium battery measured by every time operating respectively
The scoring of weight, AC internal Resistance, thickness, outward appearance, discharge capacity, discharge energy and the numerical value of power density；
(6) when calculating every time detection respectively relative to increment rate D of thickness of lithium battery during previous detection, internal resistance increase rate R,
Capability retention C, energy conservation rate Q and power conservation rate P, particularly as follows:
The increment rate of thicknessWherein n represents the number of times of detection；Dn, Dn+1 represent the lithium of twice detection respectively
The thickness of battery；
Internal resistance increase rateWherein n represents the number of times of detection；Rn、Rn+1Represent the lithium electricity of twice detection respectively
The AC internal Resistance in pond；
Capability retentionWherein n represents the number of times of detection；Cn、Cn+1Represent the electric discharge of the lithium battery of twice detection respectively
Capacity；
Energy conservation rateWherein n represents the number of times of detection；Qn、Qn+1Represent the putting of lithium battery of twice detection respectively
Electric flux；
Power conservation rateWherein n represents the number of times of detection；Pn、Pn+1Represent the power of the lithium battery of twice detection respectively
Density；
(7) use weighted mean method, calculate the functional status SOF of lithium battery as follows,
SOF=(C+R+P+Q+D+W)/6
In formula: SOF is functional status, C is capability retention, and R is internal resistance increase rate, and P is power conservation rate, and Q is that energy keeps
Rate, D be thickness increment rate, W be outward appearance scoring.
Evaluation method the most according to claim 1, it is characterised in that: the scoring of described outward appearance refers to microscope lithium battery
Outward appearance observe, complete appearance is unabroken is designated as 1, has breakage then functional status SOF to be assessed as 0；
When capability retention is down to the 80% of capability retention first, then functional status SOF is assessed as 0；
When power conservation rate is down to the 50% of power conservation rate first, then functional status SOF is assessed as 0；
When internal resistance increase rate is down to the 50% of internal resistance increase rate fall first, then functional status SOF is assessed as 0；
When thickness increment rate is down to the 30% of thickness increment rate first, then functional status SOF is assessed as 0.
Evaluation method the most according to claim 1, it is characterised in that: the discharge and recharge operation of lithium battery and lithium battery weight,
The detection of the scoring of AC internal Resistance, thickness, outward appearance, discharge capacity, discharge energy and power density is all entered at a temperature of 23 ± 2 DEG C
OK.
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| CN116111692A (en) * | 2023-03-14 | 2023-05-12 | 深圳市拓普泰克技术股份有限公司 | Outdoor portable energy storage power supply control system |
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