CN109507600A - A kind of retired ferric phosphate lithium cell echelon utilizes appraisal procedure - Google Patents
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- CN109507600A CN109507600A CN201811552417.3A CN201811552417A CN109507600A CN 109507600 A CN109507600 A CN 109507600A CN 201811552417 A CN201811552417 A CN 201811552417A CN 109507600 A CN109507600 A CN 109507600A
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- 239000005955 Ferric phosphate Substances 0.000 title claims abstract description 60
- 229940032958 ferric phosphate Drugs 0.000 title claims abstract description 60
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 title claims abstract description 60
- 229910000399 iron(III) phosphate Inorganic materials 0.000 title claims abstract description 60
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 48
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims description 17
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 8
- 230000020169 heat generation Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 4
- 229910052493 LiFePO4 Inorganic materials 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention provides a kind of retired ferric phosphate lithium cell echelons to utilize appraisal procedure, and described method includes following steps: underproof retired ferric phosphate lithium cell is rejected from lithium iron phosphate dynamic battery history data；The appearance of the retired ferric phosphate lithium cell of passed examination screens lithium iron phosphate dynamic battery not up to standard；Retired ferric phosphate lithium cell performance up to standard is assessed, determines whether battery can be utilized with echelon；Technical solution provided by the invention, the performance condition of retired lithium iron phosphate dynamic battery can either be grasped comprehensively, and judge whether battery can carry out echelon utilization, the technical feasibility that retired ferric phosphate lithium cell echelon utilizes can be specified again, so that it is guaranteed that safety and chemical property of the retired ferric phosphate lithium cell during echelon utilizes, provide good technical support for the echelon utilization of retired ferric phosphate lithium cell.
Description
Technical field
The present invention relates to a kind of appraisal procedure of energy storage technology, in particular to a kind of retired ferric phosphate lithium cell echelon benefit
Appraisal procedure.
Background technique
With the increase for using the time, the battery performance of the power battery of electric car constantly fails, when battery performance declines
After falling back on to a certain degree, in order to ensure the safety in the power performance of electric car, continual mileage and use process, automobile
Power battery must be replaced；In general, replaced power battery, high bottom of the residual capacity remained etc., are remained
Energy continued to use used in other field, as power battery echelon utilize.
Observation discovery Prospect of EVS Powered with Batteries ferric phosphate lithium ion battery with high security, environmental suitability
It is strong and many advantages, such as have extended cycle life, after retired from electric car, it would still be possible to relatively mild for condition, wanted to battery performance
Relatively low occasion is sought, to realize that the echelon of retired ferric phosphate lithium ion battery utilizes.
However not all retired ferric phosphate lithium cell can realize that echelon utilizes, because long-term by electric car
After use, battery performance obviously fails, those the physical damages such as deformation, leakage have occurred or have crossed the abuse conditions such as charge and discharge
Battery there is greatly security risk, unsuitable echelon utilizes；Therefore, realize that the echelon of retired ferric phosphate lithium cell utilizes, than
Inferior carry out Performance Evaluation, so that it is guaranteed that safety and chemical property of the retired ferric phosphate lithium cell during echelon utilizes.
The existing echelon for retired ferric phosphate lithium cell utilizes, and appraisal procedure is imperfect, accurate, it is therefore desirable to provide
A kind of retired ferric phosphate lithium cell echelon makes retired ferric phosphate lithium cell be fully used using appraisal procedure, and ensures retired
Ferric phosphate lithium cell safety during echelon utilizes.
Summary of the invention
In order to meet the needs of the prior art, the present invention provides a kind of retired ferric phosphate lithium cell echelon and utilizes appraisal procedure
Determine whether the performance of retired ferric phosphate lithium cell meets the requirement that echelon utilizes, so that it is guaranteed that retired ferric phosphate lithium cell exists
Safety and chemical property during echelon utilization.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of retired ferric phosphate lithium cell echelon utilizes appraisal procedure, which is characterized in that described method includes following steps:
1) underproof retired ferric phosphate lithium cell is rejected from lithium iron phosphate dynamic battery history data；
2) lithium iron phosphate dynamic battery not up to standard is screened from the appearance of remaining retired ferric phosphate lithium cell；
3) retired ferric phosphate lithium cell performance up to standard is assessed, determines whether battery can be utilized with echelon.
Wherein, the underproof retired ferric phosphate lithium cell of rejecting includes:
(1) once there is the battery of the super 4V of charged voltage；
(2) once there is the battery that voltage after discharging is lower than 2V；Or
(3) running temperature once occurred is more than the battery overheated after 70 DEG C.
Wherein, the appearance screens lithium iron phosphate dynamic battery not up to standard includes: to use visually judge whether battery is up to standard
It include: to have breakage, deformation, spot, leakage or mark unintelligible.
Wherein, the assessment retired ferric phosphate lithium cell performance up to standard includes:
Assess open-circuit voltage, internal resistance, capacity, storage, environmental suitability, rate charge-discharge or heat generation characteristic.
Wherein, the Performance Evaluation of the open-circuit voltage includes: open-circuit voltage U < 2V or U the > 4V for detecting the battery, then
The battery is undesirable.
Wherein, the Performance Evaluation of the internal resistance includes: internal resistance of the measurement battery under 20-100%SOC state-of-charge
2 times of internal resistance value, determine whether the battery meets the requirements when whether resistance value is greater than battery factory.
Wherein, the Performance Evaluation of the capacity includes:
With multiplying power X to the cycle charge-discharge under the battery room temperature, and record the discharge capacity C of each charge and discharge0；
Discharge capacity C after calculating the battery n-th circulation0With rated capacity P0Ratio, if C0/P0< 0.7, then
The battery is undesirable.
The Performance Evaluation of the storage includes:
Battery is charged to after saturation state with the multiplying power X and is placed 28-30 days under room temperature；
Battery after placing 28-30 days is subjected to the cycle charge-discharge to battery with the multiplying power X again, records battery the
1 discharge capacity C1With the cyclic discharge capacity C of n-thN；
According to the C1、CNAnd C0Calculate battery capacity retention ratio whether be lower than 92% or capacity restoration rate whether be lower than
Lower than 95%, determine whether the battery meets the requirements；
The capacity retention ratio presses C1/C0× 100% calculates；
The capacity restoration rate presses CN/C0× 100% calculates.
Wherein, the performance estimating method of the environmental suitability includes:
Measure the charge and discharge for carrying out 100%DOD charge and discharge to battery with multiplying power Y under at least tri- different temperatures of a, b and d
Capacity；
Calculate separately the ratio C of the charge/discharge capacity at a temperature of charge/discharge capacity and b of the battery at a temperature of a and da/Cb
And Cd/Cb；According to the Ca/CbWhether < 0.90 or Cd/CbWhether < 0.95, determine whether the battery meets the requirements.
Wherein, in the temperature, 0≤a < b < d, b are room temperature.
Wherein, the performance estimating method of the multiplying power includes:
1) under room temperature, charge and discharge is carried out to a battery with multiplying power X, Y and Z, are recorded under X, Y and Z multiplying power respectively
Charge/discharge capacity Cx, Cy and Cz of the battery；
2) the ratio C y/Cx and Cz/Cx of the Cy and Cz and Cx are calculated separately；According to the Cy/Cx of calculating whether < 0.98
Or Cz/Cx whether < 0.95, determine whether the battery meets the requirements.
Wherein, the multiplying power X < Y < Z.
Wherein, the performance estimating method of the heat generation characteristic includes:
1) thermocouple is set in battery surface, record battery is carrying out the temperature in charge and discharge process with the multiplying power Y and Z
TYAnd TZ；
2) by the temperature TYAnd TZWith environment temperature T0Comparison, if according to TY-T05 DEG C of > or TZ-T0Whether 10 DEG C of >,
Determine whether the battery meets the requirements.
Compared with the immediate prior art, technical solution of the present invention is had the following beneficial effects:
Retired ferric phosphate lithium cell echelon provided by the invention utilizes appraisal procedure, using analysis lithium iron phosphate dynamic battery
History data, reject underproof retired ferric phosphate lithium cell, passed examination retired ferric phosphate lithium cell appearance, sieve
It selects lithium iron phosphate dynamic battery not up to standard and assesses retired ferric phosphate lithium cell performance up to standard, determine whether battery can ladder
Whether the secondary technical solution utilized, has not only grasped the performance condition of retired lithium iron phosphate dynamic battery comprehensively, but also can be with for battery
Echelon is obtained using technical support, safety and chemical property of the retired ferric phosphate lithium cell during echelon utilizes is provided
To reliably ensure that, good technical support is provided for the echelon utilization of retired ferric phosphate lithium cell.
Detailed description of the invention
Fig. 1 is the flow diagram of appraisal procedure of the present invention；
Fig. 2 is the line chart of the openning circuit voltage detection result of 48 batteries described in the embodiment of the present invention,
Fig. 3 is the line chart of the internal resistance detection result of 48 batteries described in the embodiment of the present invention；
Fig. 4 is the line chart of discharge capacity of the cell testing result described in the embodiment of the present invention；
Fig. 5 is the cake chart of battery storage performance test results described in the embodiment of the present invention；
The temperature profile of battery when Fig. 6 is charge and discharge under different multiplying of the embodiment of the present invention (1/3C, 1/2C and 1C),
(a) temperature profile to charge with the multiplying power is represented, (b) is represented with the temperature profile of the multiplying power discharging.
Specific embodiment
Below by specific embodiments and the drawings, further details of the technical solution of the present invention:
As shown in Figure 1, a kind of retired ferric phosphate lithium cell echelon utilizes appraisal procedure, described method includes following steps:
1) lithium iron phosphate dynamic battery history data is analyzed, underproof retired ferric phosphate lithium cell is rejected；
2) with the appearance of the retired ferric phosphate lithium cell of ocular estimate passed examination, it is dynamic to screen appearance LiFePO4 not up to standard
Power battery；
3) retired ferric phosphate lithium cell performance up to standard is assessed, determines whether battery can be utilized with echelon.
The history data includes voltage and temperature data；The judgment criteria of the defect of data includes:
(1) once there is the battery of the super 4V of charged voltage in battery；
(2) once there is battery of the voltage lower than 2V after electric discharge in battery；Or
(3) it is more than the battery overheated after 70 DEG C that running temperature, which once occurred, in battery.
Appearance battery not up to standard includes: that battery has breakage, deformation, spot, leakage, dry tack free and/or mark
Know unintelligible.
The method of the determination successively includes open-circuit voltage, internal resistance, capacity, storage, environmental suitability, rate charge-discharge
It is assessed item by item with the battery performance of heat generation characteristic, if one of them are undesirable, excludes a possibility that echelon utilizes.
The Performance Evaluation of the open-circuit voltage includes: the open-circuit voltage U for detecting the battery, if U < 2V or U > 4V,
The battery is undesirable.
The Performance Evaluation of the internal resistance includes: the internal resistance resistance value that the battery is measured under 20-100SOC state-of-charge, if
The internal resistance resistance value is greater than 2 times of the factory internal resistance value of the battery, then the battery is undesirable.
The Performance Evaluation of the capacity includes:
1) under room temperature, the discharge capacity C of n-th to the battery charging and discharging n times and is recorded with multiplying power X0；
2) the discharge capacity C of the battery n-th is calculated0With rated capacity P0Ratio, if C0/P0< 0.7, then it is described
Battery is undesirable.
The Performance Evaluation of the storage includes:
1) battery is charged to after saturation state with the multiplying power X and is placed M days under room temperature；
2) battery of placement M days carries out battery with the multiplying power X to the charge and discharge of the n times, record battery the 1st time
Discharge capacity C1With the discharge capacity C of n-thN；
3) according to the C1、CNAnd C0Calculate the capacity retention ratio and capacity restoration rate of battery；If capacity retention ratio is lower than
92% or capacity restoration rate be lower than 95%, then the battery is undesirable；
The formula of the calculating is respectively as follows:
Capacity retention ratio: C1/C0× 100%；
Capacity restoration rate: CN/C0× 100%.
The performance estimating method of the environmental suitability includes:
1) 100%DOD charge and discharge are carried out to battery with multiplying power Y, measures the battery in tri- kinds of temperature a, b and d not equality of temperature
Charge/discharge capacity under degree；0≤a of temperature < b < d, b are room temperature.
2) ratio C of the charge/discharge capacity at a temperature of charge/discharge capacity and b of the battery at a temperature of a and d is calculated separatelya/Cb
And Cd/Cb；If the Ca/Cb< 0.90 or Cd/Cb< 0.95, then the battery is undesirable.
The performance estimating method of the multiplying power includes:
1) under room temperature, charge and discharge is carried out to battery with multiplying power X, Y and Z, record filling under X, Y and Z multiplying power respectively
Discharge capacity Cx, Cy and Cz；The multiplying power x < y < z.
2) the ratio C y/Cx and Cz/Cx of the Cy and Cz and Cx are calculated separately；If Cy/Cx < 0.98 or Cz/Cx <
0.95, then the battery is undesirable.
The performance estimating method of the heat generation characteristic includes:
1) thermocouple is set in battery surface, record battery is corresponding in the multiplying power Y and Z progress charge and discharge process
Temperature TYAnd TZ；
2) by the temperature TYAnd TZWith environment temperature T0Comparison, if TY-T05 DEG C of > or TZ-T010 DEG C of >, then the battery
It is undesirable.
Below by taking the retired lithium iron phosphate dynamic battery to get off of 48 electric charging stations as an example and in conjunction with chart, the present invention is mentioned
The technical solution of confession is described in further details, and the battery factory parameter includes: direction flexible package ferric phosphate lithium cell, specified
Capacity: 25Ah, nominal voltage: 3.20V, charge cutoff voltage: 3.65V, discharge cut-off voltage: 2.20V, internal resistance≤2.0m Ω.
1) 48 lithium iron phosphate dynamic battery history datas are analyzed, underproof retired LiFePO4 electricity is rejected
Pond:
By the background monitoring platform of electric charging station, the voltage of this 48 batteries and the history data of temperature are transferred,
It is analyzed, it is found that after this 48 batteries do not occur overcharge during history run that voltage is lower than 2V after the super 4V of voltage, electric discharge
Or running temperature is more than the case where overheat after 70 DEG C.
2) with the appearance for visually inspecting this 48 qualified retired ferric phosphate lithium cells, it is dynamic to screen LiFePO4 not up to standard
Power battery:
Under the conditions of light is good, the appearance of 48 batteries is checked, these batteries are without breakage, without change
Shape, without spot, without leakage, and battery surface is dry, mark is clear correct.
3) to 48 retired ferric phosphate lithium cells up to standard open-circuit voltage, internal resistance, capacity, storage, environmental suitability, times
The battery performance parameter of rate charge and discharge and heat generation characteristic is assessed item by item, if one of them are undesirable, excludes echelon utilization
A possibility that.
The Performance Evaluation of the open-circuit voltage includes: to be opened using high-accuracy voltage table retired ferric phosphate lithium cell monomer
Road voltage is detected, Fig. 2 be 48 batteries openning circuit voltage detection as a result, the open-circuit voltage of all batteries all in 2-4V
Within, belong to normal open-circuit voltage, meets the requirement that echelon utilizes.
The Performance Evaluation of the internal resistance includes: the internal resistance resistance value that the battery is measured under 20-100SOC state-of-charge, figure
3 be the internal resistance detection of 48 batteries as a result, wherein having the internal resistance (4.25m Ω) of 1 battery has been more than 2 times of initial internal resistance
(4m Ω) gives up echelon utilization to it.
The Performance Evaluation of the capacity includes:
1) under room temperature, the 3rd discharge capacity C to remaining power charge and discharge 3 times and is recorded with 1/3C multiplying power0,
It is as shown in Figure 4 to record result；
2) battery the 3rd time discharge capacity C is calculated0With rated capacity P0The ratio of=25Ah, wherein there is 1 battery
Capacity (15.4Ah) be lower than nominal capacity (25Ah) 70%, it is given up echelon utilization.
The Performance Evaluation of the storage includes:
1) remaining power is charged to after saturation state with the 1/3C multiplying power and is placed 7 days under room temperature；
2) battery for placing 7 days is subjected to 3 charge and discharge to battery with 1/3C multiplying power, the electric discharge that record is battery the 1st time is held
Measure C1With the 3rd discharge capacity C3；
3) according to the C1、C3And C0Calculate the capacity retention ratio and capacity restoration rate of battery；The formula of the calculating is distinguished
Are as follows:
Capacity retention ratio: C1/C0× 100%；
Capacity restoration rate: C3/C0× 100%；
Fig. 5 is the calculated result of the storge quality of battery, and as can be seen from the figure the capacity retention ratio of all batteries is high
In 92%, capacity restoration rate is above 95%, so meeting the requirement that gradient utilizes.
The performance estimating method of the environmental suitability includes:
1) with 1/2C multiplying power to the battery carry out 100%DOD constant current charge-discharge, measure the battery in 0 DEG C, 25 DEG C and
Charge/discharge capacity at 55 DEG C, the results are shown in Table 1 for record；
2) battery is calculated separately in 0 DEG C and the ratio of 55 DEG C of charge/discharge capacity and 25 DEG C of charge/discharge capacity；Calculate knot
It is as shown in the table for fruit:
Table 1
As can be drawn from Table 1: battery charge/discharge capacity ratio at 55 DEG C of charge/discharge capacities and 25 DEG C is higher than 0.95, in 0
Charge/discharge capacity ratio is higher than 0.90 at DEG C charge/discharge capacity and 25 DEG C, meets gradient using requiring.
The performance estimating method of the multiplying power includes:
1) under room temperature, with multiplying power 1/3C, 1/2C and 1C to battery charging and discharging, 1/3C, 1/2C and 1C multiplying power are recorded respectively
Under charge/discharge capacity C1/3c、C1/2cAnd C1c, as shown in table 2 below；
2) ratio calculated C1/2c/C1/3cAnd C1c/C1/3cAs shown in table 2 below；
| Multiplying power | 1/3C | 1/2C | 1C |
| Charging capacity (Ah) | 18.50 | 18.41 | 18.05 |
| Volume percent (%) | 100.0% | 99.5% | 97.6% |
| Discharge capacity (Ah) | 18.64 | 18.60 | 18.54 |
| Volume percent (%) | 100.0% | 99.8% | 99.5% |
Table 2
As can be drawn from Table 2: battery ratio of charge/discharge capacity and 1/3C rate charge-discharge capacity under 1/2C multiplying power is high
The ratio of charge/discharge capacity and 1/3C rate charge-discharge capacity is higher than 0.95 in 0.98, under 1C multiplying power, meets what gradient utilized
It is required that.
The performance estimating method of the heat generation characteristic includes:
1) thermocouple is set in battery surface, record battery carries out in charge and discharge process under with 1/2C multiplying power and 1C multiplying power
Temperature T1/2cAnd T1c；
2) by the temperature T1/2cAnd T1cWith environment temperature T0Comparison, comparing result is as shown in fig. 6, analyze it is found that battery
The temperature difference of temperature and environment temperature during 1/2C rate charge-discharge is less than the temperature during 5 DEG C, 1C rate charge-discharge
The temperature difference with environment temperature meets the requirement that gradient utilizes less than 10 DEG C.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modification perhaps equivalent replacement these without departing from any modification of spirit and scope of the invention or equivalent replacement, applying
Within pending claims of the invention.
Claims (13)
1. a kind of retired ferric phosphate lithium cell echelon utilizes appraisal procedure, which is characterized in that described method includes following steps:
1) underproof retired ferric phosphate lithium cell is rejected from lithium iron phosphate dynamic battery history data；
2) lithium iron phosphate dynamic battery not up to standard is screened from the appearance of remaining retired ferric phosphate lithium cell；
3) retired ferric phosphate lithium cell performance up to standard is assessed, determines whether battery can be utilized with echelon.
2. a kind of retired ferric phosphate lithium cell echelon as described in claim 1 utilizes appraisal procedure, which is characterized in that described to pick
Except underproof retired ferric phosphate lithium cell includes:
(1) once there is the battery of the super 4V of charged voltage；
(2) once there is the battery that voltage after discharging is lower than 2V；Or
(3) running temperature once occurred is more than the battery overheated after 70 DEG C.
3. a kind of retired ferric phosphate lithium cell echelon as described in claim 1 utilizes appraisal procedure, which is characterized in that described outer
See screen lithium iron phosphate dynamic battery not up to standard include: with visually judge battery it is whether up to standard include: have it is damaged, deform, dirt
Stain, leakage or mark are unintelligible.
4. a kind of retired ferric phosphate lithium cell echelon as described in claim 1 utilizes appraisal procedure, which is characterized in that institute's commentary
Estimating retired ferric phosphate lithium cell performance up to standard includes:
Assess open-circuit voltage, internal resistance, capacity, storage, environmental suitability, rate charge-discharge or heat generation characteristic.
5. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 4 utilizes appraisal procedure, which is characterized in that described to open
The Performance Evaluation of road voltage includes: open-circuit voltage U < 2V or U the > 4V for detecting the battery, then the battery is undesirable.
6. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 4 utilizes appraisal procedure, which is characterized in that in described
The Performance Evaluation of resistance includes: whether internal resistance resistance value of the measurement battery under 20-100%SOC state-of-charge is greater than the battery
2 times of internal resistance value, determine whether the battery meets the requirements when factory.
7. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 4 utilizes appraisal procedure, which is characterized in that the appearance
The Performance Evaluation of amount includes:
1) with multiplying power X to the cycle charge-discharge under the battery room temperature, and the discharge capacity C of each charge and discharge is recorded0；
2) the discharge capacity C after calculating the battery n-th circulation0With rated capacity P0Ratio, if C0/P0< 0.7, then it is described
Battery is undesirable.
8. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 7 utilizes appraisal procedure, which is characterized in that described to deposit
The Performance Evaluation of storage includes:
Battery is charged to after saturation state with the multiplying power X and is placed 28-30 days under room temperature；
Battery after placing 28-30 days is subjected to the cycle charge-discharge to battery with the multiplying power X again, is recorded battery the 1st time
Discharge capacity C1With the cyclic discharge capacity C of n-thN；
3) according to the C1、CNAnd C0Calculate battery capacity retention ratio whether be lower than 92% or capacity restoration rate whether be lower than it is low
In 95%, determine whether the battery meets the requirements；
The capacity retention ratio presses C1/C0× 100% calculates；
The capacity restoration rate presses CN/C0× 100% calculates.
9. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 8 utilizes appraisal procedure, which is characterized in that the ring
The performance estimating method of border adaptability includes:
1) measurement carries out the charge and discharge capacitor of 100%DOD charge and discharge under at least tri- different temperatures of a, b and d with multiplying power Y to battery
Amount；
2) ratio C of the charge/discharge capacity at a temperature of charge/discharge capacity and b of the battery at a temperature of a and d is calculated separatelya/CbWith
Cd/Cb；According to the Ca/CbWhether < 0.90 or Cd/CbWhether < 0.95, determine whether the battery meets the requirements.
10. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 9 utilizes appraisal procedure, which is characterized in that described
In temperature, 0≤a < b < d, b are room temperature.
11. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 9 utilizes appraisal procedure, which is characterized in that described
The performance estimating method of multiplying power includes:
1) under room temperature, charge and discharge is carried out to a battery with multiplying power X, Y and Z, record the electricity under X, Y and Z multiplying power respectively
Charge/discharge capacity Cx, Cy and the Cz in pond；
2) the ratio C y/Cx and Cz/Cx of the Cy and Cz and Cx are calculated separately；According to the Cy/Cx of calculating whether < 0.98 or Cz/
Cx whether < 0.95, determine whether the battery meets the requirements.
12. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 9 utilizes appraisal procedure, which is characterized in that described
Multiplying power X < Y < Z.
13. a kind of retired ferric phosphate lithium cell echelon as claimed in claim 9 utilizes appraisal procedure, which is characterized in that described
The performance estimating method of heat generation characteristic includes:
1) thermocouple is set in battery surface, record battery is carrying out the temperature T in charge and discharge process with the multiplying power Y and ZYWith
TZ；
2) the temperature TY and TZ and environment temperature T0 are compared, if according to 5 DEG C of TY-T0 > or TZ-T0 whether 10 DEG C of >, really
Whether the fixed battery meets the requirements.
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| CN110428061A (en) * | 2019-06-18 | 2019-11-08 | 中国电力科学研究院有限公司 | It is a kind of for moving back the method and system that are managed of fortune battery |
| CN110614236A (en) * | 2019-06-11 | 2019-12-27 | 恒大新能源科技集团有限公司 | Screening method for graded utilization of ex-service battery |
| CN111665446A (en) * | 2020-06-18 | 2020-09-15 | 杭州意能电力技术有限公司 | Retired power battery performance evaluation method and system |
| CN111751752A (en) * | 2020-05-20 | 2020-10-09 | 中国电力科学研究院有限公司 | Method and device for evaluating state of retired lithium iron phosphate power battery |
| CN112526367A (en) * | 2020-12-07 | 2021-03-19 | 中国电力科学研究院有限公司 | Method and system for evaluating safety of power battery by gradient utilization |
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