CN105911477A - Screening method of self discharging of power lithium ion battery - Google Patents
Screening method of self discharging of power lithium ion battery Download PDFInfo
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- CN105911477A CN105911477A CN201610234729.4A CN201610234729A CN105911477A CN 105911477 A CN105911477 A CN 105911477A CN 201610234729 A CN201610234729 A CN 201610234729A CN 105911477 A CN105911477 A CN 105911477A
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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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Abstract
The invention relates to a screening method of self discharging of a power lithium ion battery. The method comprises: a battery with a charge state of 20% to 80% is selected and is processed by formation; after formation, the battery is fed into a steel ball chamber within ten minutes to carry out steel ball sealing; the battery after steel ball sealing is cleaned and an initial alternating-current internal resistance value ACR0 of the battery is measured within 30 minutes after cleaning; after the battery is placed in an aging chamber for 72 hours, an alternating-current internal resistance value ACR1 of the battery is measured; capacity sorting is carried out on the battery and an alternating-current internal resistance value ACR2 of the battery is tested within 30 minutes after capacity sorting; an alternating-current internal resistance difference value C1 of the battery before capacity sorting as well as an internal resistance difference value C2 and a difference value C of the battery after capacity sorting is calculated; and larger C1 and C2 values and the increasing difference value C are rejected. According to the invention, with an alternating-current internal resistance value changing rule after formation and before and after capacity sorting, screening of the self-discharging power lithium ion battery us carried out, so that the production cost is saved and the product quality is improved. And the usage performance and the cyclic service life of the battery are improved.
Description
Technical field
The present invention relates to lithium ion battery triage techniques field, be specifically related to the screening technique of a kind of power lithium-ion battery self discharge.
Background technology
Development of Electric Vehicles surges forward, and Vehicular dynamic battery system is as the most topmost part, has caused extensive concern and the attention of various circles of society.Power lithium-ion battery because its specific energy is big, have extended cycle life, self discharge little (comparing lead-acid battery), memory-less effect, disclosure satisfy that the demand in terms of the passenger car higher to requirements such as volume, life-span, power, it has also become the ideal product of pure electric automobile application.But electrokinetic cell system needs multiple monomer battery core strings and forms, the uniformity of cell becomes the key factor affecting electrokinetic cell system performance, wherein the uniformity of the self discharge of battery becomes restriction power lithium-ion battery system serviceability and the key factor of cycle life, and effective self discharge screening technique is the main path solving to cause greatly battery system to lose efficacy because of self discharge.
Summary of the invention
It is an object of the invention to provide the screening technique of a kind of power lithium-ion battery self discharge, with the problem solving to cause greatly battery system to lose efficacy because of self discharge.
For achieving the above object, present invention employs techniques below scheme:
The screening technique of a kind of power lithium-ion battery self discharge, it is characterised in that comprise the following steps:
(1) choose state-of-charge battery between 20%～80% to be melted into；
(2) battery is sent in being melted into latter 10 minutes steel ball room carry out sealing steel ball；
(3) battery of envelope steel ball is carried out, in having cleaned latter 30 minutes, measures the initial AC internal Resistance ACR0 of battery；
(4) battery is put into burn-in chamber after 72 hours, measure the AC internal Resistance ACR1 of battery；
(5) battery is carried out partial volume, the AC internal Resistance ACR2 of 30 minutes build-in test batteries after partial volume；
(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) difference C=C1-C2 is calculated；
(8) value bigger than normal for rejecting C1, C2 and difference C become big value.
The screening technique of described power lithium-ion battery self discharge, in step (8), rejects C1 value bigger than normal and comprises the following steps:
(A) mean value of test sample battery AC internal Resistance difference C1 is calculated；
(B) reject the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C1 simultaneously.
In step (8), reject C2 value bigger than normal and comprise the following steps:
A () calculates the mean value of test sample battery AC internal Resistance difference C2；
B () rejects the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C2 simultaneously.
The screening technique of described power lithium-ion battery self discharge, in step (8), rejects C value bigger than normal and comprises the following steps:
(Aa) calculate the mean value organizing difference C more；
(Ba) reject the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C simultaneously.
The screening technique of described power lithium-ion battery self discharge, in above step, the environment tested during battery measurement is all carried out under 23 DEG C ± 2 DEG C normal temperature conditions.
Described screening technique is suitable for the screening of LFP/C and NCM/C bi-material system power lithium-ion battery self discharge.
As shown from the above technical solution, the screening technique of power lithium-ion battery self discharge of the present invention, AC internal Resistance value Changing Pattern after using chemical conversion and before and after partial volume, the power lithium of self discharge is screened from battery, not only save production cost, improve product quality, improve serviceability and the cycle life of battery simultaneously.
Detailed description of the invention
The screening technique of a kind of power lithium-ion battery self discharge, comprises the following steps:
S1: get the battery that 300 chemical conversions complete from workshop, now the charged state of battery is 80%；
S2: in being melted into latter 10 minutes, battery is sent into steel ball room and carries out sealing steel ball；
S3: the battery of envelope steel ball is carried out, tests the AC internal Resistance of 300 battery cores in having cleaned latter 30 minutes with HIKIO3555 internal resistance test device, be recorded as ACR00-ACR0300；
S4: after battery being put into burn-in chamber 72 hours, tests the AC internal Resistance before 300 battery core partial volumes with HIKIO3555 internal resistance test device, is recorded as ACR10-ACR1300；
S5: battery is carried out partial volume, after partial volume, the state-of-charge of battery is 80%, and after partial volume, the AC internal Resistance of 30 minutes complete batteries of build-in test is recorded as ACR20-ACR2300；
S6: calculate before partial volume internal resistance of cell difference C2 after battery AC internal Resistance difference C1 and partial volume:
C1=ACR1-ACR0, is recorded as C10-C1300；
C2= ACR2- ACR1；It is recorded as C20-C2300；
S7: calculate difference C=C1-C2, be recorded as C0-C300；
S8: reject C1, C2 value bigger than normal and difference C becomes big value, specifically comprise the following steps that
The mean value (C10+ C11++C1300)/300 calculating C1 is 0.25 milliohm, rejects C1 value value beyond 0.2375 milliohm to 0.2625 milliohm scope, rejects the value battery more than 0.3 milliohm of C1 simultaneously；
The mean value (C20+ C21++C2300)/300 calculating C2 is 0.25 milliohm, rejects C2 value value beyond 0.2375 milliohm to 0.2625 milliohm scope, rejects the value battery more than 0.3 milliohm of C2 simultaneously；
Calculate the mean value (C20+ of C
C21++C2300)/300 it is 0.25 milliohm, reject C value value beyond 0.2375 milliohm to 0.2625 milliohm scope, the value simultaneously rejecting C is more than the battery of 0.3 milliohm.
Embodiment described above is only to be described the preferred embodiment of the present invention; not the scope of the present invention is defined; on the premise of designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (6)
1. the screening technique of a power lithium-ion battery self discharge, it is characterised in that comprise the following steps:
(1) choose state-of-charge battery between 20%～80% to be melted into；
(2) battery is sent in being melted into latter 10 minutes steel ball room carry out sealing steel ball；
(3) battery of envelope steel ball is carried out, in having cleaned latter 30 minutes, measures the initial AC internal Resistance ACR0 of battery；
(4) battery is put into burn-in chamber after 72 hours, measure the AC internal Resistance ACR1 of battery；
(5) battery is carried out partial volume, the AC internal Resistance ACR2 of 30 minutes build-in test batteries after partial volume；
(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) difference C=C1-C2 is calculated；
(8) value bigger than normal for rejecting C1, C2 and difference C become big value.
The screening technique of power lithium-ion battery self discharge the most according to claim 1, it is characterised in that: in step (8), reject C1 value bigger than normal and comprise the following steps:
(A) mean value of test sample battery AC internal Resistance difference C1 is calculated；
(B) reject the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C1 simultaneously.
The screening technique of power lithium-ion battery self discharge the most according to claim 1, it is characterised in that: in step (8), reject C2 value bigger than normal and comprise the following steps:
A () calculates the mean value of test sample battery AC internal Resistance difference C2；
B () rejects the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C2 simultaneously.
The screening technique of power lithium-ion battery self discharge the most according to claim 1, it is characterised in that: in step (8), reject C value bigger than normal and comprise the following steps:
(Aa) calculate the mean value organizing difference C more；
(Ba) reject the battery more than mean deviation ± 5%, reject the absolute value battery more than 0.3 milliohm of C simultaneously.
The screening technique of power lithium-ion battery self discharge the most according to claim 1, it is characterised in that: the environment tested during battery measurement is all carried out under 23 DEG C ± 2 DEG C normal temperature conditions.
The screening technique of power lithium-ion battery self discharge the most according to claim 1, it is characterised in that: described screening technique is suitable for the screening of LFP/C and NCM/C bi-material system power lithium-ion battery self discharge.
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Cited By (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 | A kind of power battery low pressure screening technique |
| CN108614221A (en) * | 2018-05-24 | 2018-10-02 | 河南电池研究院有限公司 | A kind of evaluation method of lithium ion battery formation process |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| 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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| JPH08222279A (en) * | 1995-02-13 | 1996-08-30 | Japan Storage Battery Co Ltd | Degraded condition detecting method of sealed lead-acid battery |
| EP1243935A1 (en) * | 2001-03-19 | 2002-09-25 | Alcatel | Discharge control method for a battery of secundary electrochemical generators |
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Cited By (6)
| 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 | A kind of power battery low pressure screening technique |
| CN108614221A (en) * | 2018-05-24 | 2018-10-02 | 河南电池研究院有限公司 | A kind of evaluation method of lithium ion battery formation process |
| 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 |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| 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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| CN105911477B (en) | 2019-01-22 |
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