CN109991557A - Dynamic lithium battery cycle life detection method - Google Patents
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Abstract
The present invention relates to a kind of dynamic lithium battery cycle life detection methods, including lithium battery cycle life test and D.C. resistance DCR to test two parts；The present invention is based on the typical road conditions of electric car actual motion, the current data being actually charged and discharged is acquired by BMS host computer, as the charging and discharging constraint condition in Operation mode cycle life test, it actual can reflect working condition when battery operation in this way, the loop-around data obtained can use up the ability of the battery actual motion of big simulation；In cyclic process, the 100 addition battery core DCR tests in every intercycle monitor the situation of change of DCR during entire cycle life, compensate for cycle life in the process to the missing of the lasting detection of internal resistance；It can be good at grasping lithium battery internal resistance situation of change, can effectively instruct next group battery core R&D work, promote the improvement of battery core performance.
Description
Technical field
The present invention relates to technical field of lithium batteries, especially a kind of dynamic lithium battery cycle life detection method.
Background technique
The cycle life of lithium battery refers to lithium battery with the increase of charging-discharging cycle, and the discharge capacity of battery core gradually declines
Subtract, the battery end of life when attenuation rate is to certain proportion, cycle life is the important parameter for reflecting battery core performance.DC internal resistance
(DCR) refer to the resistance that electric current is subject to inside battery core, usual DC internal resistance is separately to be tested with cycle life, but internal resistance
Be it is continually changing with the increase of cycle-index, the stability of internal resistance be evaluate battery core a key index.
The lithium battery standard cycle lifetime testing conditions that national standard GB/T31484-2015 is defined are as follows:
1) 1C charges to blanking voltage, then constant pressure is ended to electric current 0.02C, then shelves 30min；
2) 1C is discharged to blanking voltage, then shelves 30min；
3) circulation step 1) to 2), until discharge capacity is the 80% of initial capacity, then termination test, record electric discharge are secondary
Number；
The above standard cycle method can assess the ability in battery core standard cycle service life, and this method is in development phase battery core type selecting
When, different battery cores can quickly and effectively be compared.But lithium battery is in practical applications, and electric current is not fixed value, is at any time
Continually changing by second grade, the transformational relation of standard cycle service life and actual life are difficult to find.And the internal resistance of lithium battery
It is not a fixed value, is made of the contact internal resistance of electrode material, electrolyte, internal resistance and each section part.Internal resistance is shadow
Ringing lithium battery chemical property and security performance has important parameter, and the internal resistance of lithium battery is Yi Dan increased, it is desirable to artificial to reduce
Internal resistance value is nearly impossible.So needing to collect the typical electrical flow pattern of battery core actual motion after sample delivery, work is carried out
The test of condition cycle life.Simultaneously in operating condition Lifetest procedure, DCR test is introduced, the stage internal resistance of battery core life-cycle is grasped
Variation, is the strong supporting condition of battery core type selecting, while the parameter effectively can instruct battery core to research and develop, and promotes changing for battery core performance
It is kind.
Summary of the invention
The technical problem to be solved by the present invention is being directed to existing standard cycle test method, a kind of power lithium battery is proposed
Pond cycle life detection method.
The technical scheme adopted by the invention is as follows: a kind of dynamic lithium battery cycle life detection method, comprising the following steps:
1) charging to SOC to battery pack is 100%, passes through the entire charging of battery management system BMS acquisition in charging process
The current data of process records constant-current charging phase electric current I0And constant-voltage phase ends total current I1, calculate on single battery
The constant-current charging phase electric current I of receiving0' and constant-voltage phase cut-off current I1'；
2) under battery pack full power state, electric car presses typical road conditions operation, the electricity of battery pack is vented, discharge process
In current data in entire discharge process acquired by BMS, calculate the current spectrum that single battery is born, draw out Current versus time
Curve graph；
3) appoint take in above-mentioned battery pack with the completely new lithium battery of model one, by I0' electric current puts remaining capacity in battery
It is empty；
4) electric current I is pressed0' constant-current charge to blanking voltage, then constant-voltage charge is to electric current I1' cut-off, battery is full electric shape at this time
State records charging capacity C0；By electric current I0' bleed off 10%C0Capacity, battery SOC is 90% at this time, stands 1h；Use 3C0Pulse is put
Electric 30S, by electric current I0' continue the 10%C that discharges0Capacity, adjust separately battery SOC be 80%, 70%, 60%, 50%, 40%,
30%, 20%, 10%, a DCR test is carried out under each above-mentioned SOC value state, is recorded corresponding under different SOC states
DCR value, and DCR is drawn to SOC curve graph；
5) 30~35min is stood；
6) electric current I is pressed0' constant-current charge to blanking voltage, then constant-voltage charge is to electric current I1' cut-off, battery is fully charged；
7) 30~35min is stood；
8) by the collected operating condition current discharge of step 2) to battery cutoff voltage, initial discharge capacity C is recorded1；
9) 30~35min is stood；
10) circulation step 6) to step 9)；
11) circulation step 4) to step 10), until discharge capacity of the cell is 80%C1When stop test, think at this time electricity
The pond service life has ended；It can get battery core DCR in battery cycle life number, and entire lifetime stage to gradually increase with circulation
Data.
Further, in the battery pack in step 1) of the present invention battery structure by more battery cores it is in parallel after go here and there again
Connection composition.
It further says, the cycle-index in step 10) of the present invention is circulation 100 times.
The beneficial effects of the present invention are: the typical road conditions based on electric car actual motion, are acquired real by BMS host computer
The current data that border is charged and discharged in this way can as the charging and discharging constraint condition in Operation mode cycle life test
Working condition when actual reflection battery operation, the loop-around data obtained can use up the energy of the battery actual motion of big simulation
Power；In cyclic process, the 100 addition battery core DCR tests in every intercycle monitor the change of DCR during entire cycle life
Change situation, compensates for cycle life in the process to the missing of the lasting detection of internal resistance；It can be good at grasping resistive in lithium battery
Change situation, can effectively instruct next group battery core R&D work, promotes the improvement of battery core performance.
Detailed description of the invention
Fig. 1 is the flow chart for the dynamic lithium battery Operation mode cycle life detecting method that the present invention is implemented；
Fig. 2 is the battery pack discharge current curves figure (part) of electric low running conditions of vehicle；
Fig. 3 size battery cycle life curve (under 25 DEG C of environment)；
Fig. 4 size battery DCR value is with the increased curve graph of cycle-index.
Specific embodiment
Presently in connection with attached drawing and preferred embodiment, the present invention is described in further detail.These attached drawings are simplified
Schematic diagram, the basic structure of the invention will be illustrated schematically only, therefore it only shows the composition relevant to the invention.
A kind of dynamic lithium battery cycle life detection method is with ternary lithium battery pack (capacity 60.8Ah, voltage 64.8V)
Example, the dynamic lithium battery cycle life detection method specific implementation step include:
1, this method is tested two parts by cycle life and DCR and is formed, and testing process is as shown in Figure 1；
2, cycle life charging current condition: battery pack is in the charging process from 0%SOC to 100%SOC, by BMS
Position machine testing records charging current data, and electric current when obtaining constant-current phase is 16A, and constant-voltage phase cut-off current is 1.2A, electricity
Chi Bao by 18650 batteries 19 and after again 18 strings and form, calculate and arrive single constant-current charging of battery electric current 16A/19P=0.84A, it is permanent
Pressure cut-off current is 1.2A/19P=63mA；
3, cycle life discharge current condition: electric low vehicle is by route when selected typical operation, and battery pack is full
Under electricity condition, the current data of automotive discharge is recorded when vehicle is run by BMS host computer, as shown in Fig. 2, the battery pack is by electricity
Pond 18S19P composition, the discharge current for calculating single battery is that total current shown in Fig. 2 is obtained divided by 19；
4, appoint take in above-mentioned battery pack with the completely new lithium battery of model one, by 0.84A electric current by remaining capacity in battery
Emptying.
5, end by electric current/0.84A constant-current charge to blanking voltage 4.2V, then constant pressure to electric current 63mA, battery is at this time
Full power state, record charging capacity are 3.16Ah.0.316Ah capacity is bled off by electric current 0.84, battery SOC is 90% at this time, quiet
1h is set, with 9.48A current discharge 30 seconds (electric discharge DCR), continues 10% capacity that discharges by electric current 0.84A, adjusts separately electricity
Pond SOC is 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, carries out one under each above-mentioned SOC value state
Secondary DCR test, records corresponding DCR value under different SOC states.
6, battery core is tested by the process of Fig. 1, the every circulation of battery 100 times DCR test primary, obtained entire
Lifetime stage cycle life curve, such as Fig. 3, and the DCR data of 100 circulations in interval, and draw DCR to the song of cycle life
Line, such as Fig. 4.
The method of the present invention is the typical road conditions based on electric car actual motion, acquires practical charging by BMS host computer
It in this way can be actual as the charging and discharging constraint condition in Operation mode cycle life test with the current data of electric discharge
Reflect working condition when battery operation, the loop-around data obtained can use up the ability of the battery actual motion of big simulation.
For the method for the present invention in cyclic process, the 100 addition battery core DCR tests in every intercycle monitor the entire circulation longevity
The situation of change of DCR during life compensates for cycle life in the process to the missing of the lasting detection of internal resistance.Lithium battery is grasped
Internal resistance situation of change, energy efficiency instruct next group battery core R&D work, promote the improvement of battery core performance.
It is a specific embodiment of the invention described in above instructions, various illustrations are not to reality of the invention
The limitation of matter Composition of contents, person of an ordinary skill in the technical field can be to described in the past specific after having read specification
Embodiment is made an amendment or is deformed, without departing from the spirit and scope of the invention.
Claims (3)
1. a kind of dynamic lithium battery cycle life detection method, it is characterised in that the following steps are included:
1) charging to SOC to battery pack is 100%, acquires entire charging process by battery management system BMS in charging process
Current data, record constant-current charging phase electric current I0And constant-voltage phase ends total current I1, calculate and born on single battery
Constant-current charging phase electric current I0' and constant-voltage phase cut-off current I1'；
2) under battery pack full power state, electric car presses typical road conditions operation, and the electricity of battery pack is vented, is led in discharge process
It crosses BMS and acquires current data in entire discharge process, calculate the current spectrum that single battery is born, draw out the song of Current versus time
Line chart；
3) appoint take in above-mentioned battery pack with the completely new lithium battery of model one, by I0' remaining capacity in battery is vented by electric current；
4) electric current I is pressed0' constant-current charge to blanking voltage, then constant-voltage charge is to electric current I1' cut-off, battery is full power state at this time,
Record charging capacity C0；By electric current I0' bleed off 10%C0Capacity, battery SOC is 90% at this time, stands 1h；Use 3C0Pulsed discharge
30S, by electric current I0' continue the 10%C that discharges0Capacity, adjust separately battery SOC be 80%, 70%, 60%, 50%, 40%,
30%, 20%, 10%, a DCR test is carried out under each above-mentioned SOC value state, is recorded corresponding under different SOC states
DCR value, and DCR is drawn to SOC curve graph；
5) 30~35min is stood；
6) electric current I is pressed0' constant-current charge to blanking voltage, then constant-voltage charge is to electric current I1' cut-off, battery is fully charged；
7) 30~35min is stood；
8) by the collected operating condition current discharge of step 2) to battery cutoff voltage, initial discharge capacity C is recorded1；
9) 30~35min is stood；
10) circulation step 6) to step 9)；
11) circulation step 4) to step 10), until discharge capacity of the cell is 80%C1When stop test, think battery life at this time
End；It can get the data that battery core DCR is gradually increased with circulation in battery cycle life number, and entire lifetime stage.
2. dynamic lithium battery cycle life detection method as described in claim 1, it is characterised in that: in the step 1)
Battery structure by being composed in series again after more battery cores parallel connections in battery pack.
3. dynamic lithium battery cycle life detection method as described in claim 1, it is characterised in that: in the step 10)
Cycle-index is circulation 100 times.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988726A (en) * | 2019-11-25 | 2020-04-10 | 安徽绿沃循环能源科技有限公司 | Method for detecting service life of lithium battery of electric bicycle |
| CN111487543A (en) * | 2020-04-28 | 2020-08-04 | 上海电气国轩新能源科技有限公司 | DCR test method, system, device and medium in lithium ion battery cycle |
| CN111525202A (en) * | 2020-04-28 | 2020-08-11 | 上海电气国轩新能源科技有限公司 | Method, system, equipment and medium for monitoring DCR in lithium ion battery cycle |
| CN111898241A (en) * | 2020-06-18 | 2020-11-06 | 中汽研汽车检验中心（天津）有限公司 | Method for deducing winter heating working condition and service life stage of lithium battery system |
| CN112462186A (en) * | 2020-11-18 | 2021-03-09 | 上海稊米汽车科技有限公司 | Test method for cycle life of super capacitor |
| CN113109728A (en) * | 2021-04-16 | 2021-07-13 | 惠州亿纬锂能股份有限公司 | Method and device for testing shallow DOD (disk on disk) cycle life |
| CN113176519A (en) * | 2021-04-16 | 2021-07-27 | 哈尔滨工业大学 | Lithium ion battery service life acceleration method based on particle irradiation |
| CN113504480A (en) * | 2021-06-22 | 2021-10-15 | 盛德东南(福建)新能源科技有限公司 | Direct-current internal resistance detection method of lithium ion power storage battery |
| CN114035085A (en) * | 2021-12-15 | 2022-02-11 | 湖北德普电气股份有限公司 | Detection method for intelligent direct-current charging pile power battery of electric vehicle |
| CN114236395A (en) * | 2021-12-15 | 2022-03-25 | 湖北德普电气股份有限公司 | Online comprehensive detection method for power battery of electric vehicle |
| CN114798502A (en) * | 2022-04-13 | 2022-07-29 | 杭州安影科技有限公司 | Method, system and production line for classifying and grouping batteries in echelon utilization |
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| CN110988726A (en) * | 2019-11-25 | 2020-04-10 | 安徽绿沃循环能源科技有限公司 | Method for detecting service life of lithium battery of electric bicycle |
| CN111487543A (en) * | 2020-04-28 | 2020-08-04 | 上海电气国轩新能源科技有限公司 | DCR test method, system, device and medium in lithium ion battery cycle |
| CN111525202A (en) * | 2020-04-28 | 2020-08-11 | 上海电气国轩新能源科技有限公司 | Method, system, equipment and medium for monitoring DCR in lithium ion battery cycle |
| CN111898241B (en) * | 2020-06-18 | 2022-05-27 | 中汽研汽车检验中心（天津）有限公司 | Method for deducing winter heating working condition and service life stage of lithium battery system |
| CN111898241A (en) * | 2020-06-18 | 2020-11-06 | 中汽研汽车检验中心（天津）有限公司 | Method for deducing winter heating working condition and service life stage of lithium battery system |
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| CN112462186B (en) * | 2020-11-18 | 2022-09-20 | 上海稊米汽车科技有限公司 | Test method for cycle life of super capacitor |
| CN113176519A (en) * | 2021-04-16 | 2021-07-27 | 哈尔滨工业大学 | Lithium ion battery service life acceleration method based on particle irradiation |
| CN113109728A (en) * | 2021-04-16 | 2021-07-13 | 惠州亿纬锂能股份有限公司 | Method and device for testing shallow DOD (disk on disk) cycle life |
| CN113504480A (en) * | 2021-06-22 | 2021-10-15 | 盛德东南(福建)新能源科技有限公司 | Direct-current internal resistance detection method of lithium ion power storage battery |
| CN114035085A (en) * | 2021-12-15 | 2022-02-11 | 湖北德普电气股份有限公司 | Detection method for intelligent direct-current charging pile power battery of electric vehicle |
| CN114236395A (en) * | 2021-12-15 | 2022-03-25 | 湖北德普电气股份有限公司 | Online comprehensive detection method for power battery of electric vehicle |
| CN114798502A (en) * | 2022-04-13 | 2022-07-29 | 杭州安影科技有限公司 | Method, system and production line for classifying and grouping batteries in echelon utilization |
| CN114798502B (en) * | 2022-04-13 | 2024-02-09 | 杭州安影科技有限公司 | Classification grouping method, system and production line for gradient utilization batteries |
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