CN106093794B - The high temperature service life accelerated test method of ferric phosphate lithium cell - Google Patents
The high temperature service life accelerated test method of ferric phosphate lithium cell Download PDFInfo
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- CN106093794B CN106093794B CN201610621761.8A CN201610621761A CN106093794B CN 106093794 B CN106093794 B CN 106093794B CN 201610621761 A CN201610621761 A CN 201610621761A CN 106093794 B CN106093794 B CN 106093794B
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 90
- 239000005955 Ferric phosphate Substances 0.000 title claims abstract description 89
- 229940032958 ferric phosphate Drugs 0.000 title claims abstract description 89
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 title claims abstract description 89
- 229910000399 iron(III) phosphate Inorganic materials 0.000 title claims abstract description 89
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 132
- 230000001133 acceleration Effects 0.000 claims abstract description 34
- 238000007600 charging Methods 0.000 claims abstract description 27
- 230000014759 maintenance of location Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims description 29
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 3
- 230000001939 inductive effect Effects 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 229910052493 LiFePO4 Inorganic materials 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000013178 mathematical model Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 206010011906 Death Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
Classifications
-
- 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]
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, take the ferric phosphate lithium cell that chemical conversion is completed, initial capacity test, initial acceleration test and cyclical acceleration test are carried out respectively, cyclical acceleration test is at different temperatures, to stop testing after 75% of its discharge capacity less than nominal capacity by staged accelerated test；The room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, is then realized and is converted with high temperature service life change data table according to the room temperature service life of corresponding charging temperature, obtains the room temperature service life of tested ferric phosphate lithium cell.The high temperature service life accelerated test method of the ferric phosphate lithium cell of the present invention has the characteristics that test accuracy is high, test period is short, test process is convenient and referential is strong.
Description
Technical field
The present invention relates to ferric phosphate lithium cell technical field of measurement and test, in particular to a kind of high temperature service lifes of ferric phosphate lithium cell
Accelerated test method.
Background technology
Lithium ion battery is widely used in mobile digital product, is also used for electric vehicle as energy-storage system in recent years
Among.Service life is to weigh the important indicator of battery performance, at present during the research and development of lithium ion battery, inspection and type selecting
Widely used life testing method is that loop test is carried out under certain operating mode, and the longevity is recycled currently used for test lithium ion battery
The Standard General of life is with reference to the regulation in two existing standards of China：QC/T743-2006 lithium-ions batteries for electric vehicle
With QB/T2502-2000 lithium-ions battery generic specifications, battery cycle life standard testing mainly has following two methods at present：
The first is in environment temperature（20 DEG C ± 2 DEG C) under conditions of, with 0. 5 times of current discharges of rated capacity, until putting
Capacitance is the 80% of rated capacity, then to battery with 1/3 times of electric current constant-current constant-voltage charging of rated capacity, quiet between charge and discharge
Set lh.Such charge and discharge cycles often recycle 24 times and do a capacity calibration test, until battery capacity is less than rated capacity
Experiment is terminated after 80%.
Second（20 DEG C ± 5 DEG C) under conditions of, with 1 times of electric current constant-current constant-voltage charging of nominal capacity, limit electric current
For 0.05 times of electric current of nominal capacity.It is then allowed to stand 20 minutes, then with 1 times of electric current constant-current discharge of nominal capacity to limiting electricity
Pressure stands 20 minutes, is one cycle.Until discharge time thought end-of-life less than 42 minutes twice in succession.
The major defect of the above circulation test algorithm is that test period is long, even in some accelerated test schemes (as selected
Quick charge and discharge operating mode and test etc. under high temperature environment), usually still needing to thousands of a hours just can complete to test, caused by knot
Fruit is that a large amount of test resource is occupied, and research and development of products progress is slow.
In view of this, 103344917 B of Chinese invention patent CN disclose a kind of lithium battery cycle life quickly side of test
Method.This method comprises the following steps：Step 1：According to the polarizing voltage characteristic of battery sample, determine what cycle life was quickly tested
State-of-charge section；Step 2：It carries out battery cycle life quickly to test, obtains cycle life test experiments data；Step 3：Portion
Charged section cycle life is divided to deduce mathematical model；Step 4：It establishes the charged section cycle lives of 0-100% and deduces mathematical model；
Step 5：Obtain the cycle life formula in battery 0-100% state-of-charges section；Step 6 estimates the cycle longevity of the test battery
Life.This method avoids routine test time length, accelerate cycle life test method and the big deficiency of actual deviation, shortens electricity
Design, exploitation and the test period in pond.But this method is established on the basis of a large amount of mathematical models, for professional requirement
Too high, the use that converts in conventional commercial production is inconvenient.
At the same time, the one kind of ferric phosphate lithium cell as lithium ion battery, positive electrode stability of characteristics and mineral products provide
Source is abundant, to make it have the price of good safety and relative moderate.Therefore, ferric phosphate lithium cell develops in recent years
Rapidly, the most market share is occupied in terms of electric vehicle and battery energy storage.Ferric phosphate lithium cell also has high temperatures
The characteristics of can be excellent and having extended cycle life makes it have and is applied in the potential feasible of high temperature emergency luminaire instead of nickel-cadmium cell
Property.But since its application scenarios is special, the nickel-cadmium cell in emergency lighting is applied to must satisfy ICEL1010, IEC61951
With the test request of ICEL1001, the above test assesses the high temperature reliability of battery by low current high-temperature floating-charge.
And nickel-cadmium cell belongs to different battery systems from ferric phosphate lithium cell, the test method of nickel-cadmium cell is applied in LiFePO4 electricity
Pond does not have the characteristics of alternative property, how to combine ferric phosphate lithium cell and nickel-cadmium cell and forms phosphorus in the application scenarios of emergency lighting
The high temperature service life accelerated test method of sour lithium iron battery quick and precisely obtains the lifetime data of ferric phosphate lithium cell, for pushing
Ferric phosphate lithium cell substitutes nickel-cadmium cell has important reference significance in the use of application illumination.
Invention content
The object of the present invention is to provide a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, have test accurate
Property high, test period is short, test process is convenient and referential is strong feature.
The present invention can be achieved through the following technical solutions：
The invention discloses a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, take the phosphoric acid that chemical conversion is completed
Lithium iron battery is tested in accordance with the following methods：
The first step, initial capacity test, ferric phosphate lithium cell first according to 0.2C multiplying power constant-current discharges under normal temperature condition
To blanking voltage 2.5V, then with 0.2C~0.5C constant currents, blanking voltage 3.65V, cut-off current 0.05C to ferric phosphate lithium cell
Constant-current constant-voltage charging is carried out, the initial of ferric phosphate lithium cell is tested then according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V
Capacity；
Second step, initial acceleration test, completion initial capacity test ferric phosphate lithium cell under the high temperature conditions with
0.2C~0.5C constant-current charges are to 3.65V, and 3.65V constant pressures continue floating charge one month, then at ambient temperature according to 0.2C times
Rate constant-current discharge tests the initial acceleration capacity of ferric phosphate lithium cell to blanking voltage 2.5V；
Third step, cyclical acceleration test, under the high temperature conditions the ferric phosphate lithium cell of completion initial acceleration volume test
With 0.2C~0.5C constant-current charges to 3.65V, 3.65V constant pressures continue floating charge, and the charging time is incrementally to be arranged, and is charged every time
The every of ferric phosphate lithium cell is tested respectively according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V at ambient temperature after the completion
The discharge capacity of one cycle, until 75% of its discharge capacity less than nominal capacity stops test；
After the cyclical acceleration test, the service life of ferric phosphate lithium cell is put according to following steps estimation：
A, the foundation of room temperature life test sample：The room temperature for acquiring the ferric phosphate lithium cell of room temperature charge and discharge cycles initially holds
The capacity of room temperature discharge cycles after amount and every time charging, room temperature life test sample is completed according to capacity retention ratio curve；
B, the foundation of high temperature service life test sample：The acquisition ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions it is normal
Room temperature discharge cycles capacity after warm initial capacity and every time charging completes high temperature service life test specimens according to capacity retention ratio curve
This；
C, the foundation of service life scaling module：It is kept according to room temperature life test sample and the capacity of high temperature service life test sample
Rate curve forms room temperature service life and high temperature service life change data table according to identical capacity retention ratio；
D, the room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, then according to correspondence
The room temperature service life of charging temperature is realized with high temperature service life change data table and converts, and obtains the room temperature longevity of tested ferric phosphate lithium cell
Life.
Further, the temperature that second step and third walk the floating charge is 45 DEG C, and third walks the cyclical acceleration test
The floating charge duration increases in the way of 2 months, 4 months and 8 months respectively.
The temperature that second step and third walk the floating charge is 60 DEG C, when the floating charge that third walks the cyclical acceleration test continues
Between increase in the way of 2 months, 3 months and 4 months respectively.
Further, the temperature that second step and third walk the floating charge is 55 DEG C, and third walks the cyclical acceleration test
The floating charge duration increases in the way of 2 months, 3 months and 6 months respectively.
Further, the hot conditions are provided by constant temperature constant humidity baking oven, the measuring accuracy of the constant temperature constant humidity baking oven
It is ± 2 DEG C.
Further, the discharging condition of the step A and the step B is 0.2C constant-current discharges to blanking voltage 2.5V；
The charge condition of the step A and the step B is 3.65V constant-voltage charges 0.05C after 0.2C constant-current charges.
The present invention relates to a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, have following advantageous effect：
The first, test accuracy is high, in order to assess simultaneously ferric phosphate lithium cell in the case that floating charge reliability and cycle
Service life extends the charging method of floating charge time using high temperature staged, is with reference to by room temperature life test with capacity retention ratio
Sample and high temperature service life test sample realize the conversion of high-temperature cycle life, have both met the requirement of floating charge application, and have also ensured
The requirement that data reduction is realized under the test condition of high temperature, improves the accuracy of ferric phosphate lithium cell high temperature service life test；
The second, test period is short, is arranged by using the high temperature stepped floating charge time, is stepped up the floating charge time, when
A certain stage discharge capacity, which rapidly deteriorates, can stop testing, and improve the utilization rate of test station, reduce the period of test, often
Warm data test sample and high-temperature data test sample can make full use of before data, effectively save before process to the service life
The preparation to convert；
Third, convenient test are high, and conversion is realized by inquiring room temperature service life and high temperature service life change data table, entire to turn
Process is changed to be not necessarily to deduce model by special mathematics, for data-handling capacity it is professional require it is low, convenient in production person
It is promoted the use of in work；
4th, data reference is strong, the setting of entire staged floating charge high-temperature charging work step be based primarily upon ICEL1010,
The test request of IEC61951 and ICEL1001 is configured, as the setting of floating charge blanking voltage 3.65V is namely based on ni-Cd electricity
Pond full power state is what 1.45V was accounted for, and the application for not only having met nickel-cadmium cell is practical, but also avoids blanking voltage excessively high to phosphoric acid
Caused by lithium iron battery service life damage, can be ferric phosphate lithium cell as nickel-cadmium cell alternate application in emergency lighting
It is upper that important reference is provided.
Specific implementation mode
In order that those skilled in the art will better understand the technical solution of the present invention, with reference to embodiment and to this
Invention product is described in further detail.
Embodiment 1
The invention discloses a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, take the phosphoric acid that chemical conversion is completed
Lithium iron battery is tested in accordance with the following methods：
The first step, initial capacity test, ferric phosphate lithium cell first according to 0.2C multiplying power constant-current discharges under normal temperature condition
To blanking voltage 2.5V, then ferric phosphate lithium cell is carried out with 0.5C constant currents, blanking voltage 3.65V, cut-off current 0.05C permanent
Constant-voltage charge is flowed, tests the initial capacity of ferric phosphate lithium cell to blanking voltage 2.5V then according to 0.2C multiplying powers constant-current discharge；
Second step, initial acceleration test, the ferric phosphate lithium cell that completion initial capacity is tested is under 45 DEG C of hot conditions
With 0.5C constant-current charges to 3.65V, 3.65V constant pressures continue floating charge one month, then permanent according to 0.2C multiplying powers at ambient temperature
Stream is discharged to the initial acceleration capacity of blanking voltage 2.5V test ferric phosphate lithium cells；
Third step, cyclical acceleration test, the ferric phosphate lithium cell of completion initial acceleration volume test in 45 DEG C of high temperature items
With 0.5C constant-current charges to 3.65V under part, 3.65V constant pressures continue floating charge, and the charging time is respectively 2 months, 4 months and 8 months
Incrementally it is arranged, at ambient temperature according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V after each charging complete, respectively
The discharge capacity of each cycle of ferric phosphate lithium cell is tested, until 75% of its discharge capacity less than nominal capacity stops test；
After the cyclical acceleration test, ferric phosphate lithium cell is put according to following steps estimation for 4th step, life estimate
Service life：
A, the foundation of room temperature life test sample：The room temperature for acquiring the ferric phosphate lithium cell of room temperature charge and discharge cycles initially holds
The capacity of room temperature discharge cycles after amount and every time charging, room temperature life test sample is completed according to capacity retention ratio curve；
B, the foundation of high temperature service life test sample：The acquisition ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions it is normal
Room temperature discharge cycles capacity after warm initial capacity and every time charging completes high temperature service life test specimens according to capacity retention ratio curve
This；
C, the foundation of service life scaling module：It is kept according to room temperature life test sample and the capacity of high temperature service life test sample
Rate curve forms room temperature service life and high temperature service life change data table according to identical capacity retention ratio；
D, the room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, then according to correspondence
The room temperature service life of charging temperature is realized with high temperature service life change data table and converts, and obtains the room temperature longevity of tested ferric phosphate lithium cell
Life.
In the actual implementation process, step A, the data source of step B can directly use the LiFePO4 acquired before
Battery cycle life test data, the room temperature service life that step C makes continue with high temperature service life change data table as query facility
It recycles, without repeating to make before estimation every time.
In the present embodiment, 45 DEG C of hot conditions are provided by constant temperature constant humidity baking oven, the test of the constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of the step A and the step B is 0.2C constant-current discharges to blanking voltage 2.5V；The A
The charge condition of step and the step B is 3.65V constant-voltage charges 0.05C after 0.2C constant-current charges.
It is compared by real data, in the present embodiment, test can simulate 4 years of ferric phosphate lithium cell 1 year total time
The room temperature service life, effectively save the period of test.
Embodiment 2
The invention discloses a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, take the phosphoric acid that chemical conversion is completed
Lithium iron battery is tested in accordance with the following methods：
The first step, initial capacity test, ferric phosphate lithium cell first according to 0.2C multiplying power constant-current discharges under normal temperature condition
To blanking voltage 2.5V, then ferric phosphate lithium cell is carried out with 0.3C constant currents, blanking voltage 3.65V, cut-off current 0.05C permanent
Constant-voltage charge is flowed, tests the initial capacity of ferric phosphate lithium cell to blanking voltage 2.5V then according to 0.2C multiplying powers constant-current discharge；
Second step, initial acceleration test, the ferric phosphate lithium cell that completion initial capacity is tested is under 60 DEG C of hot conditions
With 0.3C constant-current charges to 3.65V, 3.65V constant pressures continue floating charge one month, then permanent according to 0.2C multiplying powers at ambient temperature
Stream is discharged to the initial acceleration capacity of blanking voltage 2.5V test ferric phosphate lithium cells；
Third step, cyclical acceleration test, the ferric phosphate lithium cell of completion initial acceleration volume test in 60 DEG C of high temperature items
With 0.3C constant-current charges to 3.65V under part, 3.65V constant pressures continue floating charge, and the charging time is respectively 2 months, 3 months and 4 months
Incrementally it is arranged, is surveyed respectively according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V at ambient temperature after each charging complete
The discharge capacity of each cycle of ferric phosphate lithium cell is tried, until 75% of its discharge capacity less than nominal capacity stops test；
After the cyclical acceleration test, ferric phosphate lithium cell is put according to following steps estimation for 4th step, life estimate
Service life：
A, the foundation of room temperature life test sample：The room temperature for acquiring the ferric phosphate lithium cell of room temperature charge and discharge cycles initially holds
The capacity of room temperature discharge cycles after amount and every time charging, room temperature life test sample is completed according to capacity retention ratio curve；
B, the foundation of high temperature service life test sample：The acquisition ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions it is normal
Room temperature discharge cycles capacity after warm initial capacity and every time charging completes high temperature service life test specimens according to capacity retention ratio curve
This；
C, the foundation of service life scaling module：It is kept according to room temperature life test sample and the capacity of high temperature service life test sample
Rate curve forms room temperature service life and high temperature service life change data table according to identical capacity retention ratio；
D, the room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, then according to correspondence
The room temperature service life of charging temperature is realized with high temperature service life change data table and converts, and obtains the room temperature longevity of tested ferric phosphate lithium cell
Life.
In the actual implementation process, step A, the data source of step B can directly use the LiFePO4 acquired before
Battery cycle life test data, the room temperature service life that step C makes continue with high temperature service life change data table as query facility
It recycles, without repeating to make before estimation every time.
In the present embodiment, 60 DEG C of hot conditions are provided by constant temperature constant humidity baking oven, the test of the constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of the step A and the step B is 0.2C constant-current discharges to blanking voltage 2.5V；The A
The charge condition of step and the step B is 3.65V constant-voltage charges 0.05C after 0.2C constant-current charges.
It is compared by real data, in the present embodiment, test can simulate the 4 of ferric phosphate lithium cell at 0.5 year total time
In the room temperature service life in year, effectively save the period of test.
Embodiment 3
The invention discloses a kind of high temperature service life accelerated test methods of ferric phosphate lithium cell, take the phosphoric acid that chemical conversion is completed
Lithium iron battery is tested in accordance with the following methods：
The first step, initial capacity test, ferric phosphate lithium cell first according to 0.2C multiplying power constant-current discharges under normal temperature condition
To blanking voltage 2.5V, then ferric phosphate lithium cell is carried out with 0.2C constant currents, blanking voltage 3.65V, cut-off current 0.05C permanent
Constant-voltage charge is flowed, tests the initial capacity of ferric phosphate lithium cell to blanking voltage 2.5V then according to 0.2C multiplying powers constant-current discharge；
Second step, initial acceleration test, the ferric phosphate lithium cell that completion initial capacity is tested is under 55 DEG C of hot conditions
With 0.2C constant-current charges to 3.65V, 3.65V constant pressures continue floating charge one month, then at ambient temperature according to 0.2C multiplying powers
Constant-current discharge tests the initial acceleration capacity of ferric phosphate lithium cell to blanking voltage 2.5V；
Third step, cyclical acceleration test, the ferric phosphate lithium cell of completion initial acceleration volume test in 55 DEG C of high temperature items
With 0.2C constant-current charges to 3.65V under part, 3.65V constant pressures continue floating charge, and the charging time is respectively 2 months, 3 months and 6 months
Incrementally it is arranged, is surveyed respectively according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V at ambient temperature after each charging complete
The discharge capacity of each cycle of ferric phosphate lithium cell is tried, until 75% of its discharge capacity less than nominal capacity stops test；
After the cyclical acceleration test, ferric phosphate lithium cell is put according to following steps estimation for 4th step, life estimate
Service life：
A, the foundation of room temperature life test sample：The room temperature for acquiring the ferric phosphate lithium cell of room temperature charge and discharge cycles initially holds
The capacity of room temperature discharge cycles after amount and every time charging, room temperature life test sample is completed according to capacity retention ratio curve；
B, the foundation of high temperature service life test sample：The acquisition ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions it is normal
Room temperature discharge cycles capacity after warm initial capacity and every time charging completes high temperature service life test specimens according to capacity retention ratio curve
This；
C, the foundation of service life scaling module：It is kept according to room temperature life test sample and the capacity of high temperature service life test sample
Rate curve forms room temperature service life and high temperature service life change data table according to identical capacity retention ratio；
D, the room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, then according to correspondence
The room temperature service life of charging temperature is realized with high temperature service life change data table and converts, and obtains the room temperature longevity of tested ferric phosphate lithium cell
Life.
In the actual implementation process, step A, the data source of step B can directly use the LiFePO4 acquired before
Battery cycle life test data, the room temperature service life that step C makes continue with high temperature service life change data table as query facility
It recycles, without repeating to make before estimation every time.
In the present embodiment, 55 DEG C of hot conditions are provided by constant temperature constant humidity baking oven, the test of the constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of the step A and the step B is 0.2C constant-current discharges to blanking voltage 2.5V；The A
The charge condition of step and the step B is 3.65V constant-voltage charges 0.05C after 0.2C constant-current charges.
It is compared by real data, in the present embodiment, test can simulate the 4 of ferric phosphate lithium cell at 9 months total times
The high temperature service life in year, effectively saves the period of test.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the present invention in any form；It is all
The those of ordinary skill of the industry can be shown in by specification and described above and swimmingly implement the present invention；But it is all familiar
Professional and technical personnel without departing from the scope of the present invention, makes using disclosed above technology contents
A little variation, modification and evolution equivalent variations, be the present invention equivalent embodiment；Meanwhile all realities according to the present invention
Matter technology still falls within the technology of the present invention to the variation, modification and evolution etc. of any equivalent variations made by above example
Within the protection domain of scheme.
Claims (6)
1. a kind of high temperature service life accelerated test method of ferric phosphate lithium cell, it is characterised in that：Take the ferric phosphate that chemical conversion is completed
Lithium battery is tested in accordance with the following methods：
The first step, initial capacity test first extremely cut ferric phosphate lithium cell according to 0.2C multiplying powers constant-current discharge under normal temperature condition
Then only voltage 2.5V carries out ferric phosphate lithium cell with 0.2C~0.5C constant currents, blanking voltage 3.65V, cut-off current 0.05C
Constant-current constant-voltage charging tests the initial appearance of ferric phosphate lithium cell then according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V
Amount；
Second step, initial acceleration test, completion initial capacity test ferric phosphate lithium cell under the high temperature conditions with 0.2C~
0.5C constant-current charges are to 3.65V, and 3.65V constant pressures continue floating charge one month, then at ambient temperature according to 0.2C multiplying power constant currents
It is discharged to blanking voltage 2.5V, tests the initial acceleration capacity of ferric phosphate lithium cell；
Third step, cyclical acceleration test, the ferric phosphate lithium cell of completion initial acceleration volume test under the high temperature conditions with
For 0.2C~0.5C constant-current charges to 3.65V, 3.65V constant pressures continue floating charge, and the charging time is incrementally to be arranged, each charging complete
Afterwards at ambient temperature according to 0.2C multiplying powers constant-current discharge to blanking voltage 2.5V, each of ferric phosphate lithium cell is tested respectively and is followed
The discharge capacity of ring, until 75% of its discharge capacity less than nominal capacity stops test；
4th step, life estimate put the longevity of ferric phosphate lithium cell according to following steps estimation after the cyclical acceleration test
Life：
A, the foundation of room temperature life test sample：Acquire room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging every time completes room temperature life test sample according to capacity retention ratio curve；
B, the foundation of high temperature service life test sample：Acquisition is under the high temperature conditions at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles
Room temperature discharge cycles capacity after beginning capacity and every time charging completes high temperature service life test sample according to capacity retention ratio curve；
C, the foundation of service life scaling module：It is bent according to room temperature life test sample and the capacity retention ratio of high temperature service life test sample
Line forms room temperature service life and high temperature service life change data table according to identical capacity retention ratio；
D, the room temperature discharge capacity for third being walked last time discharge cycles is converted into capacity retention ratio, then according to inductive charging
The room temperature service life of temperature is realized with high temperature service life change data table and converts, and obtains the room temperature service life of tested ferric phosphate lithium cell.
2. the high temperature service life accelerated test method of ferric phosphate lithium cell according to claim 1, it is characterised in that：Second step
The temperature that the floating charge is walked with third is 45 DEG C, and third walks the floating charge duration of the cyclical acceleration test respectively according to 2
The mode of the moon, 4 months and 8 months increase.
3. the high temperature service life accelerated test method of ferric phosphate lithium cell according to claim 1, it is characterised in that：Second step
The temperature that the floating charge is walked with third is 55 DEG C, and third walks the floating charge duration of the cyclical acceleration test respectively according to 2
The mode of the moon, 3 months and 6 months increase.
4. the high temperature service life accelerated test method of ferric phosphate lithium cell according to claim 1, it is characterised in that：Second step
The temperature that the floating charge is walked with third is 60 DEG C, and third walks the floating charge duration of the cyclical acceleration test respectively according to 2
The mode of the moon, 3 months and 4 months increase.
5. the high temperature service life accelerated test method of the ferric phosphate lithium cell according to any one of claim 2~4 claim,
It is characterized in that：The hot conditions are provided by constant temperature constant humidity baking oven, and the measuring accuracy of the constant temperature constant humidity baking oven is ± 2
℃。
6. the high temperature service life accelerated test method of the ferric phosphate lithium cell according to any one of claim 2~4 claim,
It is characterized in that：The discharging condition of the step A and the step B is 0.2C constant-current discharges to blanking voltage 2.5V；The A steps
Rapid and the step B charge condition is 3.65V constant-voltage charges 0.05C after 0.2C~0.5C constant-current charges.
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Denomination of invention: Accelerated testing method for high-temperature life of lithium iron phosphate batteries Granted publication date: 20181012 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Shenzhen Branch Pledgor: BST POWER (SHENZHEN) Ltd. Registration number: Y2024980007457 |