CN105911477B - Screening method for self-discharge of power lithium ion battery - Google Patents
Screening method for self-discharge of power lithium ion battery Download PDFInfo
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- CN105911477B CN105911477B CN201610234729.4A CN201610234729A CN105911477B CN 105911477 B CN105911477 B CN 105911477B CN 201610234729 A CN201610234729 A CN 201610234729A CN 105911477 B CN105911477 B CN 105911477B
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- battery
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- power lithium
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- 238000000034 method Methods 0.000 title claims abstract description 23
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 238000012216 screening Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 101000619805 Homo sapiens Peroxiredoxin-5, mitochondrial Proteins 0.000 claims abstract description 6
- 102100022078 Peroxiredoxin-5, mitochondrial Human genes 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 101100161875 Arabidopsis thaliana ACR2 gene Proteins 0.000 claims abstract description 3
- 101100495264 Arabidopsis thaliana CDC25 gene Proteins 0.000 claims abstract description 3
- 101100380266 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ARR2 gene Proteins 0.000 claims abstract description 3
- 101150004068 acrB gene Proteins 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 3
- 230000032683 aging Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a screening method for self-discharge of a power lithium ion battery, which comprises the following steps: selecting a battery with the charge state of 20-80% for formation; sending the battery into a steel ball chamber within 10 minutes after the formation is finished, and sealing the steel balls; cleaning the battery sealed with the steel balls, and measuring the initial alternating internal resistance ACR0 of the battery within 30 minutes after the cleaning is finished; after the battery is placed in an aging room for 72 hours, measuring the AC internal resistance ACR1 of the battery; grading the capacity of the battery, and testing the alternating current internal resistance ACR2 of the battery within 30 minutes after grading the capacity; calculating a battery alternating current internal resistance difference value C1 before capacity grading, a battery internal resistance difference value C2 after capacity grading and a difference value C; the larger values of C1 and C2 and the larger value of the difference C are eliminated. The method screens the self-discharging power lithium ion battery by adopting the change rule of the alternating current internal resistance value after formation and before and after capacity grading, thereby not only saving the production cost and improving the product quality, but also improving the service performance and the cycle life of the battery.
Description
Technical field
The present invention relates to lithium ion battery screening technique fields, and in particular to a kind of sieve of power lithium-ion battery self discharge
Choosing method.
Background technique
Development of Electric Vehicles surges forward, and Vehicular dynamic battery system is used as wherein most important component part,
It has aroused widespread concern in all circles of society and payes attention to.Power lithium-ion battery is because its specific energy is big, have extended cycle life, self discharge is small
(comparing lead-acid battery), memory-less effect, can satisfy the need in terms of the passenger car more demanding to volume, service life, power etc.
It asks, it has also become the ideal product of pure electric automobile application.But electrokinetic cell system needs multiple single battery core strings and composition, it is single
Body battery with two side terminals becomes an important factor for influencing electrokinetic cell system performance, and wherein the consistency of the self discharge of battery becomes
An important factor for restricting power lithium-ion battery system service performance and cycle life, effective self discharge screening technique are to solve
Because of the main path that battery system fails caused by self discharge greatly.
Summary of the invention
The purpose of the present invention is to provide a kind of screening techniques of power lithium-ion battery self discharge, to solve because of self discharge
The problem of causing battery system to fail greatly.
To achieve the above object, the invention adopts the following technical scheme:
A kind of screening technique of power lithium-ion battery self discharge, which comprises the following steps:
(1) battery of the state-of-charge between 20%~80% is chosen to be melted into；
(2) battery feeding steel ball room is subjected to envelope steel ball in 10 minutes after the completion of being melted into；
(3) battery of envelope steel ball is cleaned, measures the initial AC internal Resistance of battery after the completion of cleaning in 30 minutes
ACR0；
(4) after battery being put into burn-in chamber 72 hours, the AC internal Resistance ACR1 of battery is measured；
(5) partial volume is carried out to battery, tests the AC internal Resistance ACR2 of battery after partial volume in 30 minutes；
(6) internal resistance of cell difference C2 after battery AC internal Resistance difference C1 and partial volume is calculated before partial volume:
C1=ACR1- ACR0, C2=ACR2- ACR1；
(7) calculating difference C=C1-C2；
(8) value that C1, C2 value and difference C bigger than normal become larger is rejected.
The screening technique of the power lithium-ion battery self discharge, in step (8), rejecting C1 value bigger than normal includes following step
It is rapid:
(A) average value of test sample battery AC internal Resistance difference C1 is calculated；
(B) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C1 is greater than the battery of 0.3 milliohm.
In step (8), reject C2 it is bigger than normal value the following steps are included:
(a) average value of test sample battery AC internal Resistance difference C2 is calculated；
(b) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C2 is greater than the battery of 0.3 milliohm.
The screening technique of the power lithium-ion battery self discharge, in step (8), rejecting C value bigger than normal includes following step
It is rapid:
(Aa) average value of multiple groups difference C is calculated；
(Ba) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C is greater than the battery of 0.3 milliohm.
The screening technique of the power lithium-ion battery self discharge in above step, is tested in battery measurement process
Environment carried out under 23 DEG C of ± 2 DEG C of normal temperature conditions.
The screening technique is suitble to the screening of two kinds of material system power lithium-ion battery self discharges of LFP/C and NCM/C.
As shown from the above technical solution, the screening technique of power lithium-ion battery self discharge of the present invention, using change
At the internal resistance value changing rule before and after rear and partial volume, the power lithium of self discharge is screened from battery, is not only saved
Production cost improves product quality, while improving the service performance and cycle life of battery.
Specific embodiment
A kind of screening technique of power lithium-ion battery self discharge, comprising the following steps:
S1: the battery that 300 chemical conversions are completed is got from workshop, the charged state of battery is 80% at this time；
S2: battery feeding steel ball room is subjected to envelope steel ball in 10 minutes after the completion of chemical conversion；
S3: the battery of envelope steel ball is cleaned, is tested in 30 minutes with HIKIO3555 internal resistance test device after the completion of cleaning
The AC internal Resistance of complete 300 battery cores, is recorded as ACR00-ACR0300；
S4: after battery is put into burn-in chamber 72 hours, 300 battery core partial volumes are tested with HIKIO3555 internal resistance test device
Preceding AC internal Resistance, is recorded as ACR10-ACR1300；
S5: partial volume is carried out to battery, the state-of-charge of battery is 80% after partial volume, tests battery in 30 minutes after partial volume
AC internal Resistance be recorded as ACR20-ACR2300；
S6: internal resistance of cell difference C2 after battery AC internal Resistance difference C1 and partial volume is calculated before partial volume:
C1=ACR1- ACR0, is recorded as C10-C1300；
C2= ACR2- ACR1；It is recorded as C20-C2300；
S7: calculating difference C=C1-C2 is recorded as C0-C300；
S8: the value that C1, C2 value and difference C bigger than normal become larger is rejected, specific step is as follows:
The average value (C10+ C11++C1300)/300 for calculating C1 is 0.25 milliohm, rejects C1 value and exists
Value other than 0.2375 milliohm to 0.2625 milliohm range, while the value for rejecting C1 is greater than the battery of 0.3 milliohm；
The average value (C20+ C21++C2300)/300 for calculating C2 is 0.25 milliohm, rejects C2 value and exists
Value other than 0.2375 milliohm to 0.2625 milliohm range, while the value for rejecting C2 is greater than the battery of 0.3 milliohm；
The average value (C20+ C21++C2300)/300 for calculating C is 0.25 milliohm, rejects C value and exists
Value other than 0.2375 milliohm to 0.2625 milliohm range, while the value for rejecting C is greater than the battery of 0.3 milliohm.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (5)
1. a kind of screening technique of power lithium-ion battery self discharge, which comprises the following steps:
(1) battery of the state-of-charge between 20%~80% is chosen to be melted into；
(2) battery feeding steel ball room is subjected to envelope steel ball in 10 minutes after the completion of being melted into；
(3) battery of envelope steel ball is cleaned, measures the initial AC internal Resistance ACR0 of battery after the completion of cleaning in 30 minutes；
(4) after battery being put into burn-in chamber 72 hours, the AC internal Resistance ACR1 of battery is measured；
(5) partial volume is carried out to battery, tests the AC internal Resistance ACR2 of battery after partial volume in 30 minutes；
(6) internal resistance of cell difference C2 after battery AC internal Resistance difference C1 and partial volume is calculated before partial volume:
C1=ACR1- ACR0, C2=ACR2- ACR1；
(7) calculating difference C=C1-C2；
(8) value that C1, C2 value and difference C bigger than normal become larger is rejected；
Wherein, reject C1 it is bigger than normal value the following steps are included:
(A) average value of test sample battery AC internal Resistance difference C1 is calculated；
(B) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C1 is greater than the battery of 0.3 milliohm.
2. the screening technique of power lithium-ion battery self discharge according to claim 1, it is characterised in that: in step (8),
Reject C2 it is bigger than normal value the following steps are included:
(a) average value of test sample battery AC internal Resistance difference C2 is calculated；
(b) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C2 is greater than the battery of 0.3 milliohm.
3. the screening technique of power lithium-ion battery self discharge according to claim 1, it is characterised in that: in step (8),
Reject C it is bigger than normal value the following steps are included:
(Aa) average value of multiple groups difference C is calculated；
(Ba) absolute value rejected the battery for being greater than mean deviation ± 5%, while rejecting C is greater than the battery of 0.3 milliohm.
4. the screening technique of power lithium-ion battery self discharge according to claim 1, it is characterised in that: battery measured
The environment tested in journey carries out under 23 DEG C of ± 2 DEG C of normal temperature conditions.
5. the screening technique of power lithium-ion battery self discharge according to claim 1, it is characterised in that: the screening side
Method is suitble to the screening of two kinds of material system power lithium-ion battery self discharges of LFP/C and NCM/C.
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| CN201610234729.4A CN105911477B (en) | 2016-04-14 | 2016-04-14 | Screening method for self-discharge of power lithium ion battery |
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| CN201610234729.4A CN105911477B (en) | 2016-04-14 | 2016-04-14 | Screening method for self-discharge of power lithium ion battery |
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| CN105911477B true CN105911477B (en) | 2019-01-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108380515A (en) * | 2018-02-02 | 2018-08-10 | 合肥国轩高科动力能源有限公司 | Low-voltage screening method for power battery |
| CN108614221B (en) * | 2018-05-24 | 2020-05-12 | 河南电池研究院有限公司 | Evaluation method for lithium ion battery formation process |
| CN110165319B (en) * | 2019-06-10 | 2022-02-22 | 河南福森新能源科技有限公司 | Sorting method for self-discharge performance of high-capacity lithium battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN112782597A (en) * | 2020-12-29 | 2021-05-11 | 惠州市恒泰科技股份有限公司 | Lithium ion battery and self-discharge screening method thereof |
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|---|---|---|---|---|
| EP1243935A1 (en) * | 2001-03-19 | 2002-09-25 | Alcatel | Discharge control method for a battery of secundary electrochemical generators |
| CN101907688A (en) * | 2010-08-02 | 2010-12-08 | 天津力神电池股份有限公司 | Method for detecting electrical property consistency of lithium ion battery |
| CN102903977A (en) * | 2012-09-29 | 2013-01-30 | 江苏恒迅中锂新能源科技有限公司 | Method for assembling lithium battery |
| CN103894350A (en) * | 2014-03-26 | 2014-07-02 | 山东精工电子科技有限公司 | Capacitance-grading screening and grouping method for cylindrical lithium battery |
| CN105319516A (en) * | 2015-11-24 | 2016-02-10 | 苏州新中能源科技有限公司 | A battery set-making and screening method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08222279A (en) * | 1995-02-13 | 1996-08-30 | Japan Storage Battery Co Ltd | Degraded condition detecting method of sealed lead-acid battery |
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- 2016-04-14 CN CN201610234729.4A patent/CN105911477B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1243935A1 (en) * | 2001-03-19 | 2002-09-25 | Alcatel | Discharge control method for a battery of secundary electrochemical generators |
| CN101907688A (en) * | 2010-08-02 | 2010-12-08 | 天津力神电池股份有限公司 | Method for detecting electrical property consistency of lithium ion battery |
| CN102903977A (en) * | 2012-09-29 | 2013-01-30 | 江苏恒迅中锂新能源科技有限公司 | Method for assembling lithium battery |
| CN103894350A (en) * | 2014-03-26 | 2014-07-02 | 山东精工电子科技有限公司 | Capacitance-grading screening and grouping method for cylindrical lithium battery |
| CN105319516A (en) * | 2015-11-24 | 2016-02-10 | 苏州新中能源科技有限公司 | A battery set-making and screening method |
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