CN106199444A - The method and system of prediction battery cycle life - Google Patents
The method and system of prediction battery cycle life Download PDFInfo
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- CN106199444A CN106199444A CN201610544214.4A CN201610544214A CN106199444A CN 106199444 A CN106199444 A CN 106199444A CN 201610544214 A CN201610544214 A CN 201610544214A CN 106199444 A CN106199444 A CN 106199444A
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of method predicting battery cycle life, including: battery is charged by a, and discharges when charging voltage reaches preset charged blanking voltage；B is to battery discharge, and is charged when discharge voltage arrives and presets discharge voltage；C repeated execution of steps a and b, until the capability retention of battery is less than predetermined threshold value；When the capability retention of d record battery is not less than predetermined threshold value, battery is performed the cycle-index of charging and discharging.Invention additionally discloses a kind of system based on said method.By aforementioned schemes, the present invention can effectively shorten predetermined period of battery cycle life, it is ensured that cell performance evaluation ageing, improves resource utilization.
Description
Technical field
The present invention relates to cell art, be specifically related to battery life detection field, particularly relate to a kind of prediction battery
The method of cycle life and system based on the method.
Background technology
The factor causing battery life to be decayed includes the reaction between positive electrode and electrolyte, electrolyte and negative material
Between reaction and electrolyte foil between reaction etc., i.e. inside battery active material configuration changes and comes off, and makes
Its life-span is become to decline.Therefore, production firm needs to be predicted for battery cycle life, to guarantee that battery disclosure satisfy that necessarily
Cycle life.But, current predictive battery cycle life is it is generally required to about 3 months, it was predicted that the cycle is longer.Due to prediction week
Phase is long, and on the one hand prior art lacks ageing for cell performance evaluation, needs to wait that the long period just can know that battery
Charge and discharge cycles is the most qualified, and on the other hand, the prediction of each battery all can take prediction passage for a long time, causes the utilization of resources
Rate is relatively low.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of method and system predicting battery cycle life, it is possible to effectively contract
Predetermined period of short battery cycle life, it is ensured that cell performance evaluation ageing, improves resource utilization.
The method of the prediction battery cycle life of one embodiment of the invention, including: battery is charged by a, and in charging voltage
Reach to discharge during preset charged blanking voltage；B is to battery discharge, and carries out when discharge voltage arrives and presets discharge voltage
Charging；C repeated execution of steps a and b, until the capability retention of battery is less than predetermined threshold value；The capability retention of d record battery
When being not less than predetermined threshold value, battery is performed the cycle-index of charging and discharging.
Alternatively, described battery includes lithium ion battery.
Alternatively, described preset charged blanking voltage includes 4.2V.
Alternatively, described default discharge voltage includes 2.0V.
Alternatively, described battery includes single battery and the set of cells being made up of multiple batteries.
The system of the prediction battery cycle life of one embodiment of the invention, including: charging circuit, for battery is charged；
Discharge circuit, for battery discharge；Control circuit, for controlling electric discharge when charging voltage reaches preset charged blanking voltage
Circuit discharges, and is charged when discharge voltage arrives and presets discharge voltage；Described control circuit is further used for control
Charging circuit processed and discharge circuit repeat described charging and described electric discharge to battery, until the capability retention of battery is less than
Predetermined threshold value, and when the capability retention recording battery is not less than described predetermined threshold value, battery is performed described charging and discharging
Cycle-index.
Alternatively, described battery includes lithium ion battery.
Alternatively, described preset charged blanking voltage includes 4.2V.
Alternatively, described default discharge voltage includes 2.0V.
Alternatively, described battery includes single battery and the set of cells being made up of multiple batteries.
The method and system of the prediction battery cycle life of the embodiment of the present invention, by the overdischarge cycle to battery, make
Obtain the SEI film (Solid Electrolyte Interface, solid electrolyte interface film) in battery constantly decompose and repair,
Thus accelerate the consumption of electrolyte, shorten predetermined period of battery cycle life, it is ensured that cell performance evaluation ageing, improve
Resource utilization.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the prediction battery cycle life of one embodiment of the invention；
Fig. 2 is that with preset charged blanking voltage as 4.2V and default discharge voltage charges and discharges the present invention for 3.0V
Time the graph of relation of capability retention and cycle-index；
Fig. 3 is that with preset charged blanking voltage as 4.2V and default discharge voltage charges and discharges the present invention for 1.5V
Time the graph of relation of capability retention and cycle-index；
Fig. 4 is that with preset charged blanking voltage as 4.2V and default discharge voltage charges and discharges the present invention for 1.0V
Time the graph of relation of capability retention and cycle-index；
Fig. 5 is the structural representation of the system of the prediction battery cycle life of one embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the skill to each exemplary embodiment provided by the present invention
Art scheme is clearly and completely described.In the case of not conflicting, the feature in following embodiment and embodiment can phase
Combination mutually.
Refer to Fig. 1, for the method for the prediction battery cycle life of one embodiment of the invention.The described prediction circulating battery longevity
The method of life can include step a～d.
A: battery is charged, and discharges when charging voltage reaches preset charged blanking voltage.
B: to battery discharge, and be charged when discharge voltage arrives and presets discharge voltage.
C: repeated execution of steps a and b, until the capability retention of battery is less than predetermined threshold value.
D: when the capability retention of record battery is not less than predetermined threshold value, battery is performed the cycle-index of charging and discharging.
The present embodiment is equivalent to battery is carried out overdischarge cycle, i.e. after battery is charged to charge cutoff voltage, then put
Electricity not higher than presets discharge voltage to voltage, then repeats to carry out battery this charging and discharging process, until the capacity of battery
Conservation rate is not less than predetermined threshold value.In the process, the cycle-index of the charging and discharging that be recorded can be considered following of battery
The ring life-span.So-called cycle life is for predetermined threshold value, and predetermined threshold value is marked as the judge that battery is the most qualified
Standard, its concrete numerical value can customize setting, and its value is different, and the cycle life of battery is the most different, and such as predetermined threshold value is the least,
The described cycle-index then tested is the most.
Battery carries out overdischarge cycle can make the SEI film in battery constantly decompose and repair, thus accelerates electrolyte
Consumption.When electrolyte is depleted to a certain degree, the capability retention of battery i.e. can reach predetermined threshold value, then continues to disappear
Consumption, then the capability retention of battery i.e. can be less than this predetermined threshold value.Based on this, the embodiment of the present invention can effectively shorten battery and follow
The predetermined period in ring life-span, it is ensured that cell performance evaluation ageing, improves resource utilization.
In the present embodiment, preset charged blanking voltage needs to be formed needed for SEI film at negative pole more than the electrolyte of battery
Voltage, default discharge voltage needs less than the voltage decomposed needed for SEI film, and this default discharge voltage is less than the electric discharge of battery
Blanking voltage.This preset charged blanking voltage is relevant to the type of battery with the value of default discharge voltage.With lithium ion battery
As a example by, preset charged blanking voltage can value be 4.2V, and default discharge voltage can value be 2.0V.Specifically:
Lithium ion battery comprises (lithium ion) battery core and protection board, and battery core includes positive pole, negative pole, barrier film and electrolyte.Negative
The active substance of pole is graphite, and has one layer of SEI film on the surface of graphite granule.This SEI film is in negative terminal surface by electrolyte
One layer of film the thinnest that reduction is formed, it is possible to effectively stop the solvent molecule in electrolyte to pass through, but allow Li+ through being somebody's turn to do
Passivation layer freely embeds and deviates from.The discharge cut-off voltage of battery core is generally 3.0V, when it discharges into below 2.0V, and negative pole
Current potential raises, and SEI film can be decomposed, and now battery core is recharged, and negative electricity potential drop is low, reaches into transmembrane potential, and electrolyte again can
SEI film is generated in negative terminal surface reduction.Therefore, along with this overdischarge cycle, SEI film can constantly decompose and repair, thus accelerate
The consumption of electrolyte.When the electrolyte content in battery core is consumed totally, the life-span of battery core also the most thoroughly terminates.
Referring to Fig. 2, in battery core, with preset charged blanking voltage as 4.2V and default discharge voltage is charged for 3.0V
During with electric discharge, capability retention reaches cycle-index corresponding when 90% at 300 times.Refer to Fig. 3, fill to preset in battery core
Electricity blanking voltage is 4.2V and default discharge voltage is 1.5V when charging and discharging, and it is right that capability retention reaches institute when 90%
The cycle-index answered is at 100 times.Referring to Fig. 4, in battery core, with preset charged blanking voltage as 4.2V and default discharge voltage is
When 1.0V charges and discharges, capability retention reaches cycle-index corresponding when 90% at 60 times.Understand based on this, when
When battery core is circulated with the default discharge voltage of 1.5V, its cycle rate is to be circulated with the default discharge voltage of 3.0V
3 times of cycle rate；When being circulated with the default discharge voltage of 1.0V, its cycle rate is the default electric discharge electricity with 3.0V
5 times of the cycle rate that pressure is circulated.Visible, used to put and circulated the loop test that can substantially speed up battery core, and preset
Discharge voltage is the lowest, and cycle rate is the highest, it was predicted that the cycle of battery cycle life is the shortest.
It should be noted that the battery of the present embodiment is not limited to lithium ion battery, the most described battery can be single
Individual battery, or the set of cells being made up of multiple batteries, as long as the battery that negative pole has described SEI film all can use said method
It is circulated the prediction in life-span.
Refer to Fig. 5, for the system of the prediction battery cycle life of one embodiment of the invention.The described prediction circulating battery longevity
The system 50 of life includes charging circuit 51, discharge circuit 52 and control circuit 53.Wherein, charging circuit 51 is for filling battery
Electricity.Discharge circuit 52 is for battery discharge.Control circuit 53 is for reaching preset charged blanking voltage time control in charging voltage
Discharge circuit processed discharges, and is charged when discharge voltage arrives and presets discharge voltage.Described control circuit 53 enters one
Step is used for controlling charging circuit 51 and discharge circuit 52 and battery repeats described charging and described electric discharge, until the appearance of battery
Amount conservation rate is less than predetermined threshold value, and when the capability retention recording battery is not less than described predetermined threshold value performs battery described
The cycle-index of charging and discharging, this cycle-index can be considered the cycle life of battery.
Wherein, preset charged blanking voltage needs to form the voltage needed for SEI film at negative pole, in advance more than the electrolyte of battery
If discharge voltage needs less than the voltage decomposed needed for SEI film, and this default discharge voltage is less than the discharge cut-off voltage of battery.
This preset charged blanking voltage is relevant to the type of battery with the value of default discharge voltage.With battery for lithium ion battery it is
Example, preset charged blanking voltage can value be 4.2V, and default discharge voltage can value be 2.0V.
The said elements correspondence of the system 50 of the prediction battery cycle life of the embodiment of the present invention performs above-mentioned each and implements
The method of example, has same technique effect.
Should be understood that and the foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every profit
The equivalent structure made by description of the invention and accompanying drawing content or equivalence flow process conversion, technical characteristic between the most each embodiment
Be combined with each other, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the patent protection of the present invention
In the range of.
Claims (10)
1. the method predicting battery cycle life, it is characterised in that described method includes:
Battery is charged by a, and discharges when charging voltage reaches preset charged blanking voltage；
B is to described battery discharge, and is charged when discharge voltage arrives and presets discharge voltage；
C repeated execution of steps a and b, until the capability retention of described battery is less than predetermined threshold value；
D records when the capability retention of described battery is not less than described predetermined threshold value and described battery is performed described charging and discharging
Cycle-index.
Method the most according to claim 1, it is characterised in that described battery includes lithium ion battery.
Method the most according to claim 2, it is characterised in that described preset charged blanking voltage includes 4.2V.
Method the most according to claim 1, it is characterised in that described default discharge voltage includes 2.0V.
Method the most according to claim 1, it is characterised in that described battery includes single battery and by multiple set of cells
The set of cells become.
6. the system predicting battery cycle life, it is characterised in that described system includes:
Charging circuit, for charging to battery；
Discharge circuit, for described battery discharge；
Control circuit, discharges for controlling described discharge circuit when charging voltage reaches preset charged blanking voltage, and
It is charged when discharge voltage arrives and presets discharge voltage；
Described control circuit is further used for controlling described charging circuit and described discharge circuit repeats institute to described battery
Stating charging and described electric discharge, until the capability retention of described battery is less than predetermined threshold value, and the capacity recording described battery is protected
When holdup is not less than described predetermined threshold value, described battery is performed the cycle-index of described charging and discharging.
System the most according to claim 6, it is characterised in that described battery includes lithium ion battery.
System the most according to claim 7, it is characterised in that described preset charged blanking voltage includes 4.2V.
System the most according to claim 6, it is characterised in that described default discharge voltage includes 2.0V.
System the most according to claim 6, it is characterised in that described battery includes single battery and by multiple batteries
The set of cells of composition.
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| CN201610544214.4A CN106199444A (en) | 2016-07-11 | 2016-07-11 | The method and system of prediction battery cycle life |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632262A (en) * | 2017-08-07 | 2018-01-26 | 北京长城华冠汽车科技股份有限公司 | A kind of detection method and device of power battery pack cycle life |
| CN108318821A (en) * | 2017-12-14 | 2018-07-24 | 合肥国轩高科动力能源有限公司 | A kind of method of fast prediction lithium electricity ternary material cycle performance |
| 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 |
| CN112147527A (en) * | 2020-09-04 | 2020-12-29 | 欣旺达电动汽车电池有限公司 | Battery pack life evaluation device and method |
| CN112462275A (en) * | 2019-09-09 | 2021-03-09 | 河南森源重工有限公司 | Battery pack cycle life testing method |
| CN112946503A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946502A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946506A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946500A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946505A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946504A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN114152891A (en) * | 2021-06-16 | 2022-03-08 | 天津力神电池股份有限公司 | Estimation method for determining electrolyte content required by lithium ion battery to reach certain cycle life |
| CN114152891B (en) * | 2021-06-16 | 2024-07-09 | 天津力神电池股份有限公司 | Estimation method for determining electrolyte content required by lithium ion battery to reach certain cycle life |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632262A (en) * | 2017-08-07 | 2018-01-26 | 北京长城华冠汽车科技股份有限公司 | A kind of detection method and device of power battery pack cycle life |
| CN108318821A (en) * | 2017-12-14 | 2018-07-24 | 合肥国轩高科动力能源有限公司 | A kind of method of fast prediction lithium electricity ternary material cycle performance |
| 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 |
| CN112462275B (en) * | 2019-09-09 | 2024-05-31 | 河南森源重工有限公司 | Method for testing cycle life of battery pack |
| CN112462275A (en) * | 2019-09-09 | 2021-03-09 | 河南森源重工有限公司 | Battery pack cycle life testing method |
| CN112946500A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946502A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946506A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946503A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946505A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946504A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946505B (en) * | 2019-12-11 | 2023-03-14 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946502B (en) * | 2019-12-11 | 2023-03-14 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946504B (en) * | 2019-12-11 | 2023-03-14 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946500B (en) * | 2019-12-11 | 2023-09-15 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112147527A (en) * | 2020-09-04 | 2020-12-29 | 欣旺达电动汽车电池有限公司 | Battery pack life evaluation device and method |
| CN114152891A (en) * | 2021-06-16 | 2022-03-08 | 天津力神电池股份有限公司 | Estimation method for determining electrolyte content required by lithium ion battery to reach certain cycle life |
| CN114152891B (en) * | 2021-06-16 | 2024-07-09 | 天津力神电池股份有限公司 | Estimation method for determining electrolyte content required by lithium ion battery to reach certain cycle life |
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