CN108226795A - A kind of experimental method for promoting battery and using cycle life - Google Patents

A kind of experimental method for promoting battery and using cycle life Download PDF

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Publication number
CN108226795A
CN108226795A CN201711363922.9A CN201711363922A CN108226795A CN 108226795 A CN108226795 A CN 108226795A CN 201711363922 A CN201711363922 A CN 201711363922A CN 108226795 A CN108226795 A CN 108226795A
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soc
target battery
battery
target
voltage
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CN201711363922.9A
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Inventor
夏厚勇
厉运杰
孙言飞
韩威振
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements

Abstract

Experimental method of the battery using cycle life is promoted the invention discloses a kind of, including：Charge and discharge are carried out, and obtain the correspondence between target battery SOC and voltage according to target battery charge and discharge data to target battery, are denoted as SOC OCV；1 SOC subinterval in the set of SOC sections is obtained, and target battery SOC sections upper limit value, the corresponding upper voltage limit value of lower limiting value, lower limiting value are obtained according to SOC subintervals upper limit value, lower limiting value and SOC OCV, is denoted as VxAnd Vy；According to Vx、VyN times charge and discharge, the ratio after record n times charge and discharge between target battery capacitance and target battery initial capacitance are carried out to target battery；M SOC subinterval carries out the operation of step S2, S3 in gathering SOC sections, obtains the ratio between corresponding m target battery capacitance and target battery initial capacitance, is denoted as Q1、Q2…Qm；Obtain Q1、Q2…QnThe corresponding SOC sections of middle maximum value are as the optimal SOC sections of target battery.

Description

A kind of experimental method for promoting battery and using cycle life
Technical field
The present invention relates to cycle performance of lithium ion battery studying technological domains more particularly to a kind of promotion battery to use cycle The experimental method in service life.
Background technology
Battery technology is pure electric vehicle, the core of Development of HEV Technology, and the quality of result directly affects electronic vapour The cruising ability of vehicle, acceleration capacity, load capacity, extreme environment adaptability and safety, stability, high efficiency and use Service life.With the rapid development of current new-energy automobile industry, more and more consumers start to be concerned about power lithium-ion battery Service life can reach electric vehicle design service life requirement.
《Power accumulator cycle life requirement used for electric vehicle and experimental method》(GBT31484-2015) requirement electricity in Pond sample when in standard cycle life test, cycle-index reaches 500 times discharge capacity should be not less than the 90% of initial capacity, Or cycle-index when reaching 1000 times discharge capacity should be not less than the 80% of initial capacity.It will thus be seen that the use of battery Service life be determine battery can be used for electric vehicle to pass factor, while the electrode material for also constraining battery can apply and Application field.
Current promotion battery capacity and service life are the trends of the times of battery development, in existing electrode material cycle performance Under conditions of to reduce charge-discharge magnification significantly do not meet actual use situation to promote service life.In practical use not It almost can seldom accomplish the full situation for being full of and putting by battery cell or entire battery pack, so seeking one kind had both met actual use The method that capacity requirement can promote battery again is most important.
Invention content
Technical problems based on background technology, the present invention propose a kind of experiment for promoting battery and using cycle life Method；
A kind of experimental method for promoting battery and using cycle life proposed by the present invention, including：
S1, charge and discharge are carried out to target battery under the first preset condition, and is obtained according to target battery charge and discharge data Correspondence between target battery SOC and voltage, is denoted as SOC-OCV；
S2, obtain 1 SOC subinterval in the set of preset SOC sections, and according to SOC subintervals upper limit value, lower limiting value and SOC-OCV obtains target battery SOC sections upper limit value, the corresponding upper voltage limit value of lower limiting value, lower limiting value, is denoted as VxAnd Vy；
S3, under the second preset condition, according to Vx、VyN times charge and discharge are carried out to target battery, record mesh after n times charge and discharge Mark the ratio between battery capacity and target battery initial capacitance；
S4, the operation of step S2, S3 is carried out to m SOC subinterval in the set of SOC sections, obtains corresponding m target electricity Ratio between pond capacitance and target battery initial capacitance, is denoted as Q1、Q2…Qm；
S5, Q is obtained1、Q2…QnThe corresponding SOC sections of middle maximum value are as the optimal SOC sections of target battery.
Preferably, step S1 is specifically included：
S11, after target battery stand 1 hour after, target battery is placed under room temperature test cabinet with 1C current discharges to electricity It presses as 3.0V；
S12, after target battery stand 1 hour after, target battery is charged to voltage as 4.2V using 1C electric current constant currents, then will Target battery charges to electric current as 0.05C at constant pressure；
S13, after target battery stand 1 hour after, by target battery using 1C current discharges to voltage as 3.0V；
S14, it repeats step S12 to S13 three times, obtains the correspondence between target battery SOC and voltage, be denoted as SOC- OCV。
Preferably, in step S2, SOC subintervals specifically include：SOC sections upper limit value is under 0~100%, SOC sections Limit value is 0~100%, and SOC interval limits value is less than SOC sections upper limit value.
Preferably, step S3 is specifically included：
S31, target battery is placed under room temperature test cabinet using 1C current discharges to voltage as 3.0V；
It is S32, full full of putting three times to target battery with 1C electric currents at 25 DEG C, take three times discharge capacity average value as mesh Mark battery initial capacity；
S33, by target battery using 1C current discharges to voltage as 3.0V；
S34, after target battery stand half an hour after, using 1C electric currents by target battery constant current charge to voltage as Vx, so Target battery is charged to electric current at constant pressure afterwards for 0.05C；
S35, after target battery stands half an hour, target battery is discharged to voltage as Vy；
S36, after repeating step S34, S35 preset times, target battery capacitance and target battery initial capacitance are recorded Between ratio.
Preferably, it in step S5, after the optimal SOC sections of target battery are obtained, further includes：
The corresponding optimal depth of round of target battery in the optimal SOC sections of output target battery, target battery optimal depth= Optimal SOC sections upper limit value-optimal SOC interval limit values.
In the present invention, under the conditions of actual operation requirements are considered, battery is being actually used in different SOC sections Imitating Middle cycle charge-discharge situation determines battery in the optimal SOC sections for meeting routine use, while obtains optimal depth, So as to reach increase battery service life, facilitate battery management system setting relevant parameter, reduce super-charge super-discharge probability and Battery consistency is improved, while is obtained under conditions of depolarising so as to the promotion of the cycle performance to battery.Battery is non-full Under the conditions of putting, can charge and discharge blanking voltage be controlled by battery management system, substantially reduce super-charge super-discharge probability, so as to Reach protection battery, promote service life.Battery non-full full of under the conditions of putting, can be to avoid inside entire battery pack Specification requirement is not achieved in partial cell voltage, so as to promote battery with two side terminals, preferably plays the capacity of battery pack.
Description of the drawings
Fig. 1 is a kind of flow diagram for promoting battery and using the experimental method of cycle life proposed by the present invention；
Fig. 2 is battery SOC-OCV curve graphs under 1C charge and discharge selected by the present invention.
Specific embodiment
With reference to Fig. 1, Fig. 2, a kind of experimental method for promoting battery and using cycle life proposed by the present invention, including：
Step S1 carries out charge and discharge, and according to target battery charge and discharge data under the first preset condition to target battery The correspondence between target battery SOC and voltage is obtained, is denoted as SOC-OCV, is specifically included：
S11, after target battery stand 1 hour after, target battery is placed under room temperature test cabinet with 1C current discharges to electricity It presses as 3.0V；
S12, after target battery stand 1 hour after, target battery is charged to voltage as 4.2V using 1C electric current constant currents, then will Target battery charges to electric current as 0.05C at constant pressure；
S13, after target battery stand 1 hour after, by target battery using 1C current discharges to voltage as 3.0V；
S14, it repeats step S12 to S13 three times, obtains the correspondence between target battery SOC and voltage, be denoted as SOC- OCV。
In concrete scheme, the correspondence tested and measured between target battery SOC and voltage is first passed through, with voltage value SOC cut-off conditions are defined, further, target battery are obtained according to the correspondence between target battery SOC and voltage SOC-OCV curves, such as Fig. 2.
Step S2 obtains 1 SOC subinterval in preset SOC sections set, and according to SOC subintervals upper limit value, lower limit Value and SOC-OCV obtain target battery SOC sections upper limit value, the corresponding upper voltage limit value of lower limiting value, lower limiting value, are denoted as VxAnd Vy, Wherein, it is 0~100% that SOC sections upper limit value, which is 0~100%, SOC interval limits value, and SOC interval limits value is less than SOC areas Between upper limit value.
Step S3, under the second preset condition, according to Vx、VyN times charge and discharge are carried out to target battery, record n times charge and discharge Ratio between target battery capacitance and target battery initial capacitance afterwards, specifically includes：
S31, target battery is placed under room temperature test cabinet using 1C current discharges to voltage as 3.0V；
It is S32, full full of putting three times to target battery with 1C electric currents at 25 DEG C, take three times discharge capacity average value as mesh Mark battery initial capacity；
S33, by target battery using 1C current discharges to voltage as 3.0V；
S34, after target battery stand half an hour after, using 1C electric currents by target battery constant current charge to voltage as Vx, so Target battery is charged to electric current at constant pressure afterwards for 0.05C；
S35, after target battery stands half an hour, target battery is discharged to voltage as Vy；
S36, after repeating step S34, S35 preset times, target battery capacitance and target battery initial capacitance are recorded Between ratio.
Step S4, m SOC subinterval carries out the operation of step S2, S3 in gathering SOC sections, obtains corresponding m mesh The ratio between battery capacity and target battery initial capacitance is marked, is denoted as Q1、Q2…Qm；
Step S5 obtains Q1、Q2…QnIt is being obtained as the optimal SOC sections of target battery in the corresponding SOC sections of middle maximum value After taking the optimal SOC sections of target battery, further include：
The corresponding optimal depth of round of target battery in the optimal SOC sections of output target battery, target battery optimal depth= Optimal SOC sections upper limit value-optimal SOC interval limit values.
In concrete scheme, SOC sections=initial state-of-charge (SOCint)~cut-off state-of-charge (SOCend), i.e. SOC Section upper limit value is cut-off state-of-charge, and the initial state-of-charge of SOC interval limit values, SOC sections upper limit value is 0~100%, SOC interval limits value is 0~100%.
SOC sections are gathered, including：
SOC subinterval=0~100% puts state, i.e. SOC for full be full ofint=0, SOCend=100%；
SOC subinterval=0~90%, i.e. SOCint=0%, SOCend=90% or SOC subinterval=10~100%, i.e., SOCint=10%, SOCend=100%；
SOC subinterval=0~80%, i.e. SOCint=0%, SOCend=80% or SOC subinterval=10~90%, SOCint=10%, SOCend=90% or SOC subinterval=20~100%, SOCint=20%, SOCend=100%；
SOC subinterval=0~70%, i.e. SOCint=0%, SOCend=70% or SOC subinterval=10~80%, i.e., SOCint=10%, SOCend=80% or SOC subinterval=20~90%, SOCint=20%, SOCend=90% or SOC sub-districts Between=30~100%, SOCint=30%, SOCend=100%；
SOC subinterval=0~60%, i.e. SOCint=0%, SOCend=60% or SOC subinterval=10~70%, i.e., SOCint=10%, SOCend=70% or SOC subinterval=20~80%, i.e. SOCint=20%, SOCend=80% or SOC Section=30~90%, i.e. SOCint=30%, SOCend=90% or SOC subinterval=40~100%, i.e. SOCint=40%, SOCend=100%.
For example, SOC-OCV is obtained：
1. prepare a 38Ah battery；
2. under the conditions of battery is placed on room temperature test cabinet, being first discharged to voltage under 1C (38A) size of current respectively is 3.0V；
3. stand 1 hour；
4. and then again under 1C (38A) size of current constant current is charged to voltage as 4.2V, then charged under constant pressure (4.2V) Electric current ends when being 0.05C (1.9A)；
5. stand 1 hour；
6. and then voltage is discharged under 1C (38A) size of current as 3.0V；
7. stand 1 hour；
4.~7. 3 time it 8. repeats, you can the correspondence between target battery SOC and voltage is obtained, according to target battery Correspondence between SOC and voltage does figure and obtains SOC-OCV curves.
The circulation experiment of SOC=0~90%：
1. prepare a 38Ah battery；
2. under the conditions of battery is placed on room temperature test cabinet, being first discharged to voltage under 1C (38A) size of current respectively is 3.0V；
3. constant volume.Completely held three weeks full of blow-down with 1C (38A) electric current under 25 DEG C of temperature conditions before cycle, take 3 electric discharges Capacity average value records initial capacity；
4. voltage is discharged under 1C (38A) size of current as 3.0V；
5. using 1C (38A) constant current charges to SOC=90% (blanking voltage is 3.912V), then constant pressure is charged to electric current and is End during 0.05C (1.9A)；
6. stand 30 minutes；
7. with 1C (38A) constant current discharge, it is discharged to SOC=0 (blanking voltage 3.0V) stoppings；
8. stand 30 minutes；
9. repeating 5.~8. step, preset times are repeated, record the ratio between battery capacity and battery initial capacitance Value.
In present embodiment, under the conditions of actual operation requirements are considered, battery is in different SOC sections Imitating in reality Cycle charge-discharge situation in use determines battery in the optimal SOC sections for meeting routine use, while obtains optimal depth Degree, so as to reach increase battery service life, facilitate battery management system setting relevant parameter, reduce super-charge super-discharge probability And battery consistency is improved, while obtain under conditions of depolarising so as to the promotion of the cycle performance to battery.Battery is non- It is full charge and discharge blanking voltage to be controlled full of under the conditions of putting by battery management system, substantially reduce super-charge super-discharge probability, from And reach protection battery, promote service life.Battery, full of under the conditions of putting, inside entire battery pack, can be kept away non-full Exempt from partial cell voltage and specification requirement is not achieved, so as to promote battery with two side terminals, preferably play the capacity of battery pack.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (5)

1. a kind of experimental method for promoting battery and using cycle life, which is characterized in that including：
S1, charge and discharge are carried out to target battery under the first preset condition, and target is obtained according to target battery charge and discharge data Correspondence between battery SOC and voltage, is denoted as SOC-OCV；
S2,1 SOC subinterval in preset SOC sections set is obtained, and according to SOC subintervals upper limit value, lower limiting value and SOC- OCV obtains target battery SOC sections upper limit value, the corresponding upper voltage limit value of lower limiting value, lower limiting value, is denoted as VxAnd Vy；
S3, under the second preset condition, according to Vx、VyN times charge and discharge are carried out to target battery, record target electricity after n times charge and discharge Ratio between pond capacitance and target battery initial capacitance；
S4, the operation of step S2, S3 is carried out to m SOC subinterval in the set of SOC sections, obtains corresponding m target battery electricity Ratio between capacity and target battery initial capacitance, is denoted as Q1、Q2…Qm；
S5, Q is obtained1、Q2…QnThe corresponding SOC sections of middle maximum value are as the optimal SOC sections of target battery.
2. the experimental method according to claim 1 for promoting battery and using cycle life, which is characterized in that step S1, tool Body includes：
S11, after target battery stand 1 hour after, by target battery be placed under room temperature test cabinet using 1C current discharges to voltage as 3.0V；
S12, after target battery stand 1 hour after, target battery is charged to voltage as 4.2V using 1C electric current constant currents, then by target Battery charges to electric current as 0.05C at constant pressure；
S13, after target battery stand 1 hour after, by target battery using 1C current discharges to voltage as 3.0V；
S14, it repeats step S12 to S13 three times, obtains the correspondence between target battery SOC and voltage, be denoted as SOC-OCV.
3. the experimental method according to claim 1 for promoting battery and using cycle life, which is characterized in that in step S2, SOC subintervals, specifically include：SOC sections upper limit value is that 0~100%, SOC interval limits value is 0~100%, and SOC sections Lower limiting value is less than SOC sections upper limit value.
4. the experimental method according to claim 1 for promoting battery and using cycle life, which is characterized in that step S3, tool Body includes：
S31, target battery is placed under room temperature test cabinet using 1C current discharges to voltage as 3.0V；
It is S32, full full of putting three times to target battery with 1C electric currents at 25 DEG C, take three times discharge capacity average value it is electric as target Pond initial capacity；
S33, by target battery using 1C current discharges to voltage as 3.0V；
S34, after target battery stand half an hour after, using 1C electric currents by target battery constant current charge to voltage as Vx, then by mesh Mark battery charges to electric current as 0.05C at constant pressure；
S35, after target battery stands half an hour, target battery is discharged to voltage as Vy；
S36, it after repeating step S34, S35 preset times, records between target battery capacitance and target battery initial capacitance Ratio.
5. the experimental method according to claim 1 for promoting battery and using cycle life, which is characterized in that in step S5, After the optimal SOC sections of target battery are obtained, further include：
Export the corresponding optimal depth of round of target battery in the optimal SOC sections of target battery, target battery optimal depth=optimal SOC sections upper limit value-optimal SOC interval limit values.
CN201711363922.9A 2017-12-18 2017-12-18 A kind of experimental method for promoting battery and using cycle life Pending CN108226795A (en)

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CN109061485A (en) * 2018-06-30 2018-12-21 合肥国轩高科动力能源有限公司 A kind of SOC-OCV test method in lithium ion battery discharge process
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CN110045296A (en) * 2019-04-12 2019-07-23 奇瑞新能源汽车技术有限公司 A kind of batteries of electric automobile cycle life estimating system and method
CN111103549A (en) * 2019-12-16 2020-05-05 中车大连机车车辆有限公司 Method for judging maintenance requirement of battery system of hybrid power locomotive
CN116070466A (en) * 2023-03-08 2023-05-05 上海泰矽微电子有限公司 Optimal SOC simulation value searching method under battery cut-off voltage

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CN109188303A (en) * 2018-08-13 2019-01-11 莱茵技术监护（深圳）有限公司 Fast charge system detection method, equipment and storage medium
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CN116070466A (en) * 2023-03-08 2023-05-05 上海泰矽微电子有限公司 Optimal SOC simulation value searching method under battery cut-off voltage
CN116070466B (en) * 2023-03-08 2023-06-13 上海泰矽微电子有限公司 Optimal SOC simulation value searching method under battery cut-off voltage

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