CN106093794A - 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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- 229910052744 lithium Inorganic materials 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 88
- 239000005955 Ferric phosphate Substances 0.000 title claims abstract description 87
- 229940032958 ferric phosphate Drugs 0.000 title claims abstract description 87
- 229910000399 iron(III) phosphate Inorganic materials 0.000 title claims abstract description 87
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 135
- 230000001133 acceleration Effects 0.000 claims abstract description 33
- 238000007600 charging Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 230000014759 maintenance of location Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000007667 floating Methods 0.000 claims description 29
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 5
- 230000002085 persistent effect Effects 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
- 229910000398 iron phosphate Inorganic materials 0.000 claims 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 8
- 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
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000002045 lasting effect Effects 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 206010011906 Death Diseases 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000011712 cell development 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
- 230000004069 differentiation Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005303 weighing 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
Abstract
The invention discloses the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, take the ferric phosphate lithium cell completing chemical conversion, carry out initial capacity test, initial acceleration test and cyclical acceleration test respectively, cyclical acceleration test be at different temperatures, by staged accelerated test until its discharge capacity less than nominal capacity 75% after stop test；The room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then realizes conversion according to the room temperature life-span of corresponding charging temperature with high temperature service life conversion tables of data, draw the room temperature life-span 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 advantages 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, specifically refer to the high temperature service life of a kind of ferric phosphate lithium cell
Accelerated test method.
Background technology
Lithium ion battery is widely used in mobile digital product, is the most also used for electric automobile as energy-storage system
Among.Service life is the important indicator weighing battery performance, at present during research and development, inspection and the type selecting of lithium ion battery
Widely used life testing method is to be circulated test under certain operating mode, is currently used for testing the lithium ion battery circulation longevity
The Standard General of life is with reference to the regulation in existing two standards of China: QC/T743-2006 lithium-ions battery used for electric vehicle
With QB/T2502-2000 lithium-ions battery generic specification, battery cycle life standard testing currently mainly has a following two kinds method:
The first is under conditions of ambient temperature (20 DEG C ± 2 DEG C), with 0. 5 times of current discharges of rated capacity, until electric discharge is held
Amount is the 80% of rated capacity, then to battery with 1/3 times of electric current constant-current constant-voltage charging of rated capacity, stands lh between discharge and recharge.
So charge and discharge cycles, often circulation is done a capacity for 24 times and is demarcated test, until battery capacity less than the 80% of rated capacity after eventually
Only experiment.
The second is under conditions of (20 DEG C ± 5 DEG C), with 1 times of electric current constant-current constant-voltage charging of nominal capacity, limits electric current
0.05 times of electric current for nominal capacity.Then 20 minutes are stood, then with 1 times of electric current constant-current discharge of nominal capacity to limiting electricity
Pressure, stands 20 minutes, for once circulating.Until double discharge time is less than within 42 minutes, thinking end-of-life.
The major defect of above circulation test algorithm is that test period is long, even in some accelerated test schemes (as selected
Quickly charge and discharge operating mode and carry out test etc. in high temperature environments), generally still need to thousands of hours just can complete to test, the knot caused
Fruit is that substantial amounts of test resource is occupied, and research and development of products progress is slow.
Being directed to this, Chinese invention patent CN 103344917 B discloses a kind of lithium battery cycle life quickly side of test
Method.The method comprises the steps: step 1: according to the polarizing voltage characteristic of battery sample, determine what cycle life was quickly tested
State-of-charge is interval；Step 2: carry out battery cycle life and quickly test, obtains cycle life test experiments data；Step 3: portion
Charged interval cycle life is divided to deduce mathematical model；Step 4: set up the charged interval cycle life of 0-100% and deduce mathematical model；
Step 5: obtain the cycle life formula that battery 0-100% state-of-charge is interval；Step 6 estimates the circulation longevity of this test battery
Life.This method avoids conventionally test time length, accelerate the deficiency that cycle life method of testing is big with actual deviation, shorten electricity
The design in pond, exploitation and test period.But, the method is set up on the basis of a large amount of mathematical modeies, for professional requirement
The highest, the use that converts in conventional commercial produces is inconvenient for.
Meanwhile, ferric phosphate lithium cell is as the one of lithium ion battery, and its positive electrode stability of characteristics and mineral products provide
Source is enriched, thus makes it have the price of good safety and relative moderate.Therefore, ferric phosphate lithium cell development in recent years
Rapidly, in terms of electric automobile and battery energy storage, the most market share is occupied.Ferric phosphate lithium cell also has high temperatures
Can the excellent and feature that has extended cycle life so that it is possessed replace nickel-cadmium cell to apply at high temperature emergency luminaire potential feasible
Property.But, owing to its application scenarios is special, apply the nickel-cadmium cell in emergency lighting must to be fulfilled for ICEL1010, IEC61951
With the test request of ICEL1001, the high temperature reliability of battery is all estimated by above test by small area analysis high-temperature floating-charge.
And nickel-cadmium cell belongs to different battery systems from ferric phosphate lithium cell, the method for testing of nickel-cadmium cell is applied at LiFePO4 electricity
Pond does not have alternative property, and the feature and the nickel-cadmium cell that how to combine ferric phosphate lithium cell form phosphorus at the application scenarios of emergency lighting
The high temperature service life accelerated test method of acid lithium iron battery, quick and precisely obtains the life-span receipt of ferric phosphate lithium cell, for promoting
Ferric phosphate lithium cell substitutes nickel-cadmium cell and has important reference significance in the use of application illumination.
Summary of the invention
It is an object of the invention to provide the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, there is test accurately
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 the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, take the LiFePO4 completing chemical conversion
Battery, tests in accordance with the following methods:
The first step, initial capacity are tested, and under normal temperature condition, ferric phosphate lithium cell are first extremely cut according to 0.2C multiplying power constant-current discharge
Only voltage 2.5V, is then carried out ferric phosphate lithium cell with 0.2C～0.5C constant current, blanking voltage 3.65V, cut-off current 0.05C
Constant-current constant-voltage charging, then according to the initial appearance of 0.2C multiplying power constant-current discharge to blanking voltage 2.5V test ferric phosphate lithium cell
Amount；
Second step, initial acceleration are tested, complete the ferric phosphate lithium cell of initial capacity test under the high temperature conditions with 0.2C～
0.5C constant-current charge continues floating charge one month to 3.65V, 3.65V constant voltage, the most at ambient temperature according to 0.2C multiplying power constant current
It is discharged to the initial acceleration capacity of blanking voltage 2.5V test ferric phosphate lithium cell；
3rd step, cyclical acceleration are tested, complete the ferric phosphate lithium cell of initial acceleration volume test under the high temperature conditions with
0.2C～0.5C constant-current charge continues floating charge to 3.65V, 3.65V constant voltage, and the charging interval, for incrementally to arrange, has charged every time
The each of ferric phosphate lithium cell is tested according to 0.2C multiplying power constant-current discharge respectively to blanking voltage 2.5V at ambient temperature after one-tenth
The discharge capacity of circulation, until its discharge capacity is less than 75% stopping test of nominal capacity.
Further, after the test of described cyclical acceleration terminates, put according to following steps estimation the life-span of ferric phosphate lithium cell:
A, the foundation of room temperature life test sample: gather room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging, completes room temperature life test sample according to capability retention curve every time；
B, the foundation of high temperature service life test sample: gather at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions
Room temperature discharge cycles capacity after beginning capacity and every time charging, completes high temperature service life test sample according to capability retention curve；
C, the foundation of life-span scaling module: bent with the capability retention of high temperature service life test sample according to room temperature life test sample
Line, according to identical capability retention formation room temperature life-span and high temperature service life conversion tables of data:
D, the room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then according to inductive charging
The room temperature life-span of temperature realizes conversion with high temperature service life conversion tables of data, draws the room temperature life-span of tested ferric phosphate lithium cell.
Further, described in second step and the 3rd step, the temperature of floating charge is 45 DEG C, cyclical acceleration test described in the 3rd step
The floating charge persistent period increases according to the mode of 2 months, 4 months and 8 months respectively.
Described in second step and the 3rd step, the temperature of floating charge is 60 DEG C, when described in the 3rd step, the floating charge of cyclical acceleration test continues
Between increase according to the mode of 2 months, 3 months and 4 months respectively.
Further, described in second step and the 3rd step, the temperature of floating charge is 55 DEG C, cyclical acceleration test described in the 3rd step
The floating charge persistent period increases according to the mode of 2 months, 3 months and 6 months respectively.
Further, described hot conditions is provided by constant temperature constant humidity baking oven, the measuring accuracy of described constant temperature constant humidity baking oven
For ± 2 DEG C.
Further, the discharging condition of described step A and described step B is 0.2C constant-current discharge to blanking voltage 2.5V；
The charge condition of described step A and described step B is 3.65V constant-voltage charge 0.05C after 0.2C constant-current charge.
The present invention relates to the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, there is following beneficial effect:
The first, test accuracy is high, in order to assess ferric phosphate lithium cell reliability in the case of floating charge and cycle life simultaneously,
Use high temperature staged to extend the charging method of floating charge time, with capability retention for reference to by room temperature life test sample and
High temperature service life test sample realizes the conversion of high-temperature cycle life, had both met the requirement of floating charge application, and also ensure that at high temperature
Test condition under realize the requirement of data reduction, improve the accuracy of ferric phosphate lithium cell high temperature service life test；
The second, test period is short, by using high temperature stepped floating charge set of time, is stepped up the floating charge time, when a certain
Stage discharge capacity deteriorates rapidly and can stop test, improves the utilization rate of test station, reduces the cycle of test, room temperature number
Data before can making full use of according to test sample and high-temperature data test sample, effectively save front operation and carry out the life-span
The preparation of conversion；
3rd, convenient test is high, realizes conversion by the inquiry room temperature life-span with high temperature service life conversion tables of data, whole converted
Cheng Wuxu relies on special mathematics to deduce model, requires low for data-handling capacity professional, it is simple in Manufacturing Worker
Promote the use of；
4th, data refer is strong, the setting of whole 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-G electricity
Pond full power state is that 1.45V accounts for, and the application both having met nickel-cadmium cell is actual, avoids again blanking voltage too high to phosphoric acid
The infringement that lithium iron battery causes service life, can be that the ferric phosphate lithium cell alternate application as nickel-cadmium cell is in emergency lighting
The reference that upper offer is important.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with embodiment and to this
Invention product is described in further detail.
Embodiment 1
The invention discloses the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, take the LiFePO4 completing chemical conversion
Battery, tests in accordance with the following methods:
The first step, initial capacity are tested, and under normal temperature condition, ferric phosphate lithium cell are first extremely cut according to 0.2C multiplying power constant-current discharge
Only voltage 2.5V, then carries out constant current with 0.5C constant current, blanking voltage 3.65V, cut-off current 0.05C permanent to ferric phosphate lithium cell
Pressure charging, then according to the initial capacity of 0.2C multiplying power constant-current discharge to blanking voltage 2.5V test ferric phosphate lithium cell；
Second step, initial acceleration test, complete initial capacity test ferric phosphate lithium cell under 45 DEG C of hot conditionss with
0.5C constant-current charge continues floating charge one month to 3.65V, 3.65V constant voltage, the most at ambient temperature according to 0.2C multiplying power constant current
It is discharged to the initial acceleration capacity of blanking voltage 2.5V test ferric phosphate lithium cell；
3rd step, cyclical acceleration are tested, completing the ferric phosphate lithium cell of initial acceleration volume test under 45 DEG C of hot conditionss
With 0.5C constant-current charge to 3.65V, 3.65V constant voltage continues floating charge, and the charging interval is respectively 2 months, 4 months and 8 months and is incremented by
Formula arrange, after each charging complete at ambient temperature according to 0.2C multiplying power constant-current discharge to blanking voltage 2.5V, test respectively
The discharge capacity of each circulation of ferric phosphate lithium cell, until its discharge capacity is less than 75% stopping test of nominal capacity.
4th step, life estimate, after the test of described cyclical acceleration terminates, put ferric phosphate lithium cell according to following steps estimation
Life-span:
A, the foundation of room temperature life test sample: gather room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging, completes room temperature life test sample according to capability retention curve every time；
B, the foundation of high temperature service life test sample: gather at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions
Room temperature discharge cycles capacity after beginning capacity and every time charging, completes high temperature service life test sample according to capability retention curve；
C, the foundation of life-span scaling module: bent with the capability retention of high temperature service life test sample according to room temperature life test sample
Line, according to identical capability retention formation room temperature life-span and high temperature service life conversion tables of data:
D, the room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then according to inductive charging
The room temperature life-span of temperature realizes conversion with high temperature service life conversion tables of data, draws the room temperature life-span of tested ferric phosphate lithium cell.
In actual implementation process, step A, the Data Source of step B can directly use the LiFePO4 gathered before
Battery cycle life test data, the room temperature life-span that step C makes is lasting as query facility with high temperature service life conversion tables of data
Recycle, it is not necessary to repeat before estimation to make every time.
In the present embodiment, 45 DEG C of hot conditionss are provided by constant temperature constant humidity baking oven, the test of described constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of described step A and described step B is 0.2C constant-current discharge to blanking voltage 2.5V；Described A
The charge condition of step and described step B is 3.65V constant-voltage charge 0.05C after 0.2C constant-current charge.
By real data comparison, in the present embodiment, test can simulate 4 years of ferric phosphate lithium cell 1 year total time
The room temperature life-span, effectively save the cycle of test.
Embodiment 2
The invention discloses the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, take the LiFePO4 completing chemical conversion
Battery, tests in accordance with the following methods:
The first step, initial capacity are tested, and under normal temperature condition, ferric phosphate lithium cell are first extremely cut according to 0.2C multiplying power constant-current discharge
Only voltage 2.5V, then carries out constant current with 0.3C constant current, blanking voltage 3.65V, cut-off current 0.05C permanent to ferric phosphate lithium cell
Pressure charging, then according to the initial capacity of 0.2C multiplying power constant-current discharge to blanking voltage 2.5V test ferric phosphate lithium cell；
Second step, initial acceleration test, complete initial capacity test ferric phosphate lithium cell under 60 DEG C of hot conditionss with
0.3C constant-current charge continues floating charge one month to 3.65V, 3.65V constant voltage, the most at ambient temperature according to 0.2C multiplying power constant current
It is discharged to the initial acceleration capacity of blanking voltage 2.5V test ferric phosphate lithium cell；
3rd step, cyclical acceleration are tested, completing the ferric phosphate lithium cell of initial acceleration volume test under 60 DEG C of hot conditionss
With 0.3C constant-current charge to 3.65V, 3.65V constant voltage continues floating charge, and the charging interval is respectively 2 months, 3 months and 4 months and is incremented by
Formula is arranged, and tests phosphorus according to 0.2C multiplying power constant-current discharge respectively to blanking voltage 2.5V at ambient temperature after each charging complete
The discharge capacity of each circulation of acid lithium iron battery, until its discharge capacity is less than 75% stopping test of nominal capacity.
4th step, life estimate, after the test of described cyclical acceleration terminates, put ferric phosphate lithium cell according to following steps estimation
Life-span:
A, the foundation of room temperature life test sample: gather room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging, completes room temperature life test sample according to capability retention curve every time；
B, the foundation of high temperature service life test sample: gather at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions
Room temperature discharge cycles capacity after beginning capacity and every time charging, completes high temperature service life test sample according to capability retention curve；
C, the foundation of life-span scaling module: bent with the capability retention of high temperature service life test sample according to room temperature life test sample
Line, according to identical capability retention formation room temperature life-span and high temperature service life conversion tables of data:
D, the room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then according to inductive charging
The room temperature life-span of temperature realizes conversion with high temperature service life conversion tables of data, draws the room temperature life-span of tested ferric phosphate lithium cell.
In actual implementation process, step A, the Data Source of step B can directly use the LiFePO4 gathered before
Battery cycle life test data, the room temperature life-span that step C makes is lasting as query facility with high temperature service life conversion tables of data
Recycle, it is not necessary to repeat before estimation to make every time.
In the present embodiment, 60 DEG C of hot conditionss are provided by constant temperature constant humidity baking oven, the test of described constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of described step A and described step B is 0.2C constant-current discharge to blanking voltage 2.5V；Described A
The charge condition of step and described step B is 3.65V constant-voltage charge 0.05C after 0.2C constant-current charge.
By real data comparison, in the present embodiment, test can simulate the 4 of ferric phosphate lithium cell at 0.5 year total time
In the room temperature life-span in year, effectively save the cycle of test.
Embodiment 3
The invention discloses the high temperature service life accelerated test method of a kind of ferric phosphate lithium cell, take the LiFePO4 completing chemical conversion
Battery, tests in accordance with the following methods:
The first step, initial capacity are tested, and under normal temperature condition, ferric phosphate lithium cell are first extremely cut according to 0.2C multiplying power constant-current discharge
Only voltage 2.5V, then carries out constant current with 0.2C constant current, blanking voltage 3.65V, cut-off current 0.05C permanent to ferric phosphate lithium cell
Pressure charging, then according to the initial capacity of 0.2C multiplying power constant-current discharge to blanking voltage 2.5V test ferric phosphate lithium cell；
Second step, initial acceleration test, complete initial capacity test ferric phosphate lithium cell under 55 DEG C of hot conditionss with
0.2C constant-current charge continues floating charge one month to 3.65V, 3.65V constant voltage, permanent according to 0.2C multiplying power the most at ambient temperature
Stream is discharged to blanking voltage 2.5V, the initial acceleration capacity of test ferric phosphate lithium cell；
3rd step, cyclical acceleration are tested, completing the ferric phosphate lithium cell of initial acceleration volume test under 55 DEG C of hot conditionss
With 0.2C constant-current charge to 3.65V, 3.65V constant voltage continues floating charge, and the charging interval is respectively 2 months, 3 months and 6 months and is incremented by
Formula is arranged, and tests phosphorus according to 0.2C multiplying power constant-current discharge respectively to blanking voltage 2.5V at ambient temperature after each charging complete
The discharge capacity of each circulation of acid lithium iron battery, until its discharge capacity is less than 75% stopping test of nominal capacity.
4th step, life estimate, after the test of described cyclical acceleration terminates, put ferric phosphate lithium cell according to following steps estimation
Life-span:
A, the foundation of room temperature life test sample: gather room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging, completes room temperature life test sample according to capability retention curve every time；
B, the foundation of high temperature service life test sample: gather at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions
Room temperature discharge cycles capacity after beginning capacity and every time charging, completes high temperature service life test sample according to capability retention curve；
C, the foundation of life-span scaling module: bent with the capability retention of high temperature service life test sample according to room temperature life test sample
Line, according to identical capability retention formation room temperature life-span and high temperature service life conversion tables of data:
D, the room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then according to inductive charging
The room temperature life-span of temperature realizes conversion with high temperature service life conversion tables of data, draws the room temperature life-span of tested ferric phosphate lithium cell.
In actual implementation process, step A, the Data Source of step B can directly use the LiFePO4 gathered before
Battery cycle life test data, the room temperature life-span that step C makes is lasting as query facility with high temperature service life conversion tables of data
Recycle, it is not necessary to repeat before estimation to make every time.
In the present embodiment, 55 DEG C of hot conditionss are provided by constant temperature constant humidity baking oven, the test of described constant temperature constant humidity baking oven
Precision is ± 2 DEG C；The discharging condition of described step A and described step B is 0.2C constant-current discharge to blanking voltage 2.5V；Described A
The charge condition of step and described step B is 3.65V constant-voltage charge 0.05C after 0.2C constant-current charge.
By real data comparison, 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 cycle of test.
The above, only presently preferred embodiments of the present invention, not the present invention is made any pro forma restriction；All
The those of ordinary skill of the industry all can shown in by specification and the above and implement the present invention swimmingly；But, all familiar
Professional and technical personnel, in the range of without departing from technical solution of the present invention, may utilize disclosed above technology contents and makes
A little change, the equivalent variations modifying and develop, be the Equivalent embodiments of the present invention；Meanwhile, all realities according to the present invention
The change of any equivalent variations that above example is made by matter technology, modify and differentiation etc., all still fall within the technology of the present invention
Within the protection domain of scheme.
Claims (7)
1. the high temperature service life accelerated test method of a ferric phosphate lithium cell, it is characterised in that: take the iron phosphate completing chemical conversion
Lithium battery, tests in accordance with the following methods:
The first step, initial capacity are tested, and under normal temperature condition, ferric phosphate lithium cell are first extremely cut according to 0.2C multiplying power constant-current discharge
Only voltage 2.5V, is then carried out ferric phosphate lithium cell with 0.2C～0.5C constant current, blanking voltage 3.65V, cut-off current 0.05C
Constant-current constant-voltage charging, then according to the initial appearance of 0.2C multiplying power constant-current discharge to blanking voltage 2.5V test ferric phosphate lithium cell
Amount；
Second step, initial acceleration are tested, complete the ferric phosphate lithium cell of initial capacity test under the high temperature conditions with 0.2C～
0.5C constant-current charge continues floating charge one month to 3.65V, 3.65V constant voltage, the most at ambient temperature according to 0.2C multiplying power constant current
It is discharged to blanking voltage 2.5V, the initial acceleration capacity of test ferric phosphate lithium cell；
3rd step, cyclical acceleration are tested, complete the ferric phosphate lithium cell of initial acceleration volume test under the high temperature conditions with
0.2C～0.5C constant-current charge to 3.65V, 3.65V constant voltage continue floating charge, the charging interval for incrementally to arrange, each charging complete
After at ambient temperature according to 0.2C multiplying power constant-current discharge to blanking voltage 2.5V, test each of ferric phosphate lithium cell respectively and follow
The discharge capacity of ring, until its discharge capacity is less than 75% stopping test of nominal capacity.
The high temperature service life accelerated test method of ferric phosphate lithium cell the most according to claim 1, it is characterised in that follow described in:
After ring accelerated test terminates, according to the life-span of following steps estimation ferric phosphate lithium cell:
A, the foundation of room temperature life test sample: gather room temperature charge and discharge cycles ferric phosphate lithium cell room temperature initial capacity and
The capacity of room temperature discharge cycles after charging, completes room temperature life test sample according to capability retention curve every time；
B, the foundation of high temperature service life test sample: gather at the beginning of the room temperature of the ferric phosphate lithium cell of charge and discharge cycles under the high temperature conditions
Room temperature discharge cycles capacity after beginning capacity and every time charging, completes high temperature service life test sample according to capability retention curve；
C, the foundation of life-span scaling module: bent with the capability retention of high temperature service life test sample according to room temperature life test sample
Line, according to identical capability retention formation room temperature life-span and high temperature service life conversion tables of data:
D, the room temperature discharge capacity of the 3rd last discharge cycles of step is converted into capability retention, then according to inductive charging
The room temperature life-span of temperature realizes conversion with high temperature service life conversion tables of data, draws the room temperature life-span of tested ferric phosphate lithium cell.
The high temperature service life accelerated test method of ferric phosphate lithium cell the most according to claim 1, it is characterised in that: second step
Being 45 DEG C with the temperature of floating charge described in the 3rd step, described in the 3rd step, the floating charge persistent period of cyclical acceleration test is respectively according to 2
The mode of the moon, 4 months and 8 months increases.
The high temperature service life accelerated test method of ferric phosphate lithium cell the most according to claim 1, it is characterised in that: second step
Being 55 DEG C with the temperature of floating charge described in the 3rd step, described in the 3rd step, the floating charge persistent period of cyclical acceleration test is respectively according to 2
The mode of the moon, 3 months and 6 months increases.
The high temperature service life accelerated test method of ferric phosphate lithium cell the most according to claim 1, it is characterised in that: second step
Being 60 DEG C with the temperature of floating charge described in the 3rd step, described in the 3rd step, the floating charge persistent period of cyclical acceleration test is respectively according to 2
The mode of the moon, 3 months and 4 months increases.
6. according to the high temperature service life accelerated test method of the ferric phosphate lithium cell described in claim 3～5 any one claim,
It is characterized in that: described hot conditions is provided by constant temperature constant humidity baking oven, the measuring accuracy of described constant temperature constant humidity baking oven is ± 2
℃。
7. according to the high temperature service life accelerated test method of the ferric phosphate lithium cell described in claim 3～5 any one claim,
It is characterized in that: the discharging condition of described step A and described step B is 0.2C constant-current discharge to blanking voltage 2.5V；Described A walks
The charge condition of rapid and described step B is 3.65V constant-voltage charge 0.05C after 0.2C～0.5C constant-current charge.
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