CN108363013A - A kind of self discharge detection method of nickle cobalt lithium manganate battery - Google Patents
A kind of self discharge detection method of nickle cobalt lithium manganate battery Download PDFInfo
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- CN108363013A CN108363013A CN201810073788.7A CN201810073788A CN108363013A CN 108363013 A CN108363013 A CN 108363013A CN 201810073788 A CN201810073788 A CN 201810073788A CN 108363013 A CN108363013 A CN 108363013A
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- lithium manganate
- cobalt lithium
- self discharge
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention discloses a kind of self discharge detection methods of nickle cobalt lithium manganate battery, charge and discharge pretreatment will be carried out by nickle cobalt lithium manganate battery after partial volume first, a period of time is stood in different temperature environments respectively again, test open-circuit voltage V1 and V2, calculate the value of W=V1 V2, the larger battery of self discharge is picked out by the judgement of W values, this method eliminates electrode polarization by pretreatment, polarization and influence of the system destabilizing factor to voltage pair are reduced to greatest extent, quickly the excessive battery of self discharge can be filtered out before in groups in a short time, test accurate and effective, substantially increase product quality, self discharge big battery is avoided to influence whole group battery with two side terminals, to extend the service life of battery pack.
Description
Technical field
The invention belongs to technical field of lithium ion, the present invention relates to a kind of nickle cobalt lithium manganate battery (i.e. ternary lithium from
Sub- battery) self discharge detection method.
Background technology
With the development of ev industry, due to nickle cobalt lithium manganate battery have it is closeer than other lithium ion battery energy
The advantages of degree is high, long lifespan, ternary lithium battery applications have become a kind of trend with electric vehicle.
Accumulator with external circuit when not connecting, battery capacity loss caused by being reacted by internal polarization, commonly referred to as certainly
Electric discharge.Indicate that the self discharge of such as various lithium ion batteries is all seldom, monthly about with capacity percentage that is annual or monthly losing
1-2%, metal hydride battery are then larger up to monthly 10% or more.Uncertainty due to production process and various lifes
Production process it is uncontrollable, the battery that there is manufacturing defect on a small quantity is constantly present, the numerical value of self discharge attribute often exceed with batch
Battery several times often cause whole group to power when connection in series-parallel is powered for circuit together for these abnormal batteries and normal battery
The performance of circuit declines.Therefore the battery of those self discharge attribute abnormals is filtered out.
In ternary lithium battery production technology, there is each self discharge selection process in each producer, mainly has at present following several
Kind：1. battery is charged to half electric state, selects after storing a period of time, exactly selected between voltage flat site, but battery
In this section, voltage and volume change unobvious, required storage time is longer, and more difficult picks out；2. will
Battery is charged to full electric state, is selected after storing a period of time, in this section, voltage and volume change also unobvious, it is more difficult to
It accurately picks out, and battery memory capacity loss under full electric state is larger；3. be discharged after battery partial volume (discharge into 2.0V or
Person 2.5V), after storing a period of time, selected by way of detecting bounce voltage, this method storage time is short, can
Shorten flow time, but this method is higher to product processing coherence request, battery discharge procedure is differed due to polarized state
Cause can cause a part of battery that can not judge self discharge by bounce voltage.4.QC/T743-2006 " lithium ions for electric vehicle
The method of test spray charging precipitator as defined in accumulator " is that accumulator stores 28 days at 20 ± 5 DEG C, and this method is due to depositing
Overlong time is stored up, larger pressure can be caused to normally producing, do not used directly, it is generally all that this method is fast for verifying other
The accuracy of fast self discharge test method, specific criteria for selection is by each enterprise depending on respective production control ability.
Therefore, it is necessary to design a kind of self discharge detection method of new nickle cobalt lithium manganate battery.
Invention content
Technical problem to be solved by the invention is to provide a kind of self discharge detection methods of nickle cobalt lithium manganate battery, should
The self discharge detection method detection efficiency of nickle cobalt lithium manganate battery is high, easy to implement.
The technical solution of invention is as follows：
A kind of self discharge detection method of nickle cobalt lithium manganate battery, which is characterized in that include the following steps：
(1) charge and discharge pretreatment is carried out to nickle cobalt lithium manganate battery；
(2) stabilization time will be stood in the first set temperature environment to disappear by pretreated nickle cobalt lithium manganate battery
Except battery polarization, tests and record open-circuit voltage V1；
(3) nickle cobalt lithium manganate battery is being stood into the self discharge time in the second set temperature environment, is testing and records out
Road voltage V2；
(4) the difference W of V1 and V2 is calculated, then W is compared with setting value, self discharge is picked out according to comparison result
Big battery.
10. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 1, it is characterised in that：Step
(1) the pretreated process of charge and discharge is as follows in：
(1) nickle cobalt lithium manganate battery is charged into upper voltage limit (i.e. upper limit blanking voltage) with the first setting multiplying power, then permanent
Pressure 4.2V charge to cut-off current, shelve 10-30min, [be best to shelve 15min], after again with first set multiplying power constant current
It is discharged to lower voltage limit (i.e. low cutoff voltage), the cycle above process 4~6 times；
(2) it is recycled to after being discharged to blanking voltage for the last time, then with the second setting multiplying power constant-current discharge to the first setting
Voltage V0, after shelving 30-60min, [30min is best ,] sets multiplying power constant-current discharge to V with third again0It is described to eliminate polarization
Third sets multiplying power and is less than the second setting multiplying power；
(3) it eliminates and battery is shelved into 30-60min after polarizing, 30min is best, is filled again with the 4th setting multiplying power constant current later
Electricity to second setting voltage.
The stabilization time is 10~25 hours.
The stabilization time is 45~120 hours.
Described first sets multiplying power as 0.25C-0.5C.
Described second sets multiplying power as 0.2C-0.3C.
The third sets multiplying power as 0.05C-0.15C.
Described 4th sets multiplying power as 0.05C-0.1C.
The first setting voltage V0For 3.0-3.5V.
Described second sets voltage as 3.9-4.2V.
Advantageous effect：
The present invention nickle cobalt lithium manganate battery self discharge detection method, first will after partial volume nickle cobalt lithium manganate electricity
Pond carries out charge and discharge pretreatment, then a period of time is stood in different temperature environments respectively, tests open-circuit voltage V1 and V2,
The value for calculating W=V1-V2 picks out the larger battery of self discharge by the judgement of W values, and this method eliminates electrode by pretreatment
Polarization reduces polarization and influence of the system destabilizing factor to voltage pair, will quickly can put certainly in a short time to greatest extent
The excessive battery of electricity filters out before in groups, tests accurate and effective, substantially increases product quality, avoid the big electricity of self discharge
Pond influences whole group battery with two side terminals, to extend the service life of battery pack.
The present invention can go out self discharge big battery by quick-pick in a short time, the battery combo for avoiding self discharge big to electricity
Chi Zuzhong causes the inconsistent of whole group battery, to improve battery pack service life.
Specific implementation mode
The present invention is described in further details below with reference to specific embodiment：
The self discharge detection method of ternary lithium battery of the present invention, its step are as follows：
(1) to the carry out charge and discharge pretreatment of ternary lithium ion battery；
(2) a period of time will be stood in the first set temperature environment by pretreated ternary lithium ion battery to disappear
Except battery polarization, tests and record open-circuit voltage V1, it is known as stabilization time this period；
(3) ternary lithium ion battery in the second set temperature environment is stood into a period of time again, tests and records open circuit
Voltage V2, it is known as the self discharge time this period；
(4) V is calculated1With V2Difference W, then W values are compared with setting value, the big electricity of self discharge is picked out in judgement
Pond.
The pretreated process of charge and discharge is as follows in this case step (1)：
(1) ternary lithium ion battery is charged into blanking voltage with the first setting electric current, then constant-voltage charge is to ending electricity
Stream is shelved after a period of time again with the first setting electric current constant-current discharge to blanking voltage, the cycle above process 4~6 times；
(2) it is recycled to after discharging into blanking voltage for the last time, then with the second setting electric current constant-current discharge to the first setting
Voltage V0, after shelving a period of time, then with third setting electric current constant-current discharge to V0To eliminate polarization, the third setting electric current
Less than the second setting electric current；
(3) battery is shelved for a period of time after eliminating polarization, is set again with the 4th setting electric current constant-current charge to second later
Constant voltage.
The first set temperature that ternary lithium ion battery is stood in this example is 25 ± 5 DEG C of room temperature, and the second set temperature is
55±5℃.Stabilization time is 11~25 hours, and the self discharge time is 45~125 hours.
The first setting electric current during pretreated is 0.3C~0.6C, and the second setting electric current is 0.2~0.3C, the
Three setting electric currents are 0.05C~0.2C, and the 4th setting electric current is 0.05C~0.1C, the first setting voltage V0For 3.0-3.5V,
Second sets voltage as 3.9-4.2V, charge cutoff voltage 4.2V, discharge cut-off voltage 3V.Step shelves the time in (1)
For 50min, it is 40min that the time is shelved in step (2), and it is 50min that the time is shelved in step (3).
It is described in detail below in conjunction with specific implementation row, chooses wherein 20 groups of experimental datas and illustrate W values and battery lotus
Relationship between electric conservation rate.
Embodiment 1
By taking capacity is the ternary lithium ion battery of 2.2Ah as an example, first with 0.5C multiplying powers to battery charge-discharge cycle 3 times, with
0.3C current discharges shelve 30min, then with the current discharge of 0.05C to 3V, shelve 30min, with 0.1C constant-current charges to 3V
To 4.2V, battery stands 12 hours for 20 DEG C in room temperature, tests and records open-circuit voltage V1, it is small that battery in 50 DEG C of high temperature stands 48
When, it tests and records open-circuit voltage V2, W=V is calculated1-V2Value, later by all batteries of the group according to spray charging precipitator
Method is tested
Table one：
From table one it can be concluded that W>When 7.0, the spray charging precipitator of the battery is less than 94%, k<Battery charge is protected when 7
Holdup is more than 94%.Number A24, A8, A1 batteries are believed that its self discharge is big in table one, should give rejecting, other batteries carry out
It circulates to next process.
Example 2
By taking capacity is the ternary lithium ion battery of 2.2Ah as an example, first with 0.5C current versus cells charge and discharge cycles 5 times, with
0.3C current discharges shelve 30min, then with 0.05C current discharges to 3V, shelve 50min, extremely with 0.1C constant-current charges to 3V
4.2V, 20 DEG C of battery room temperature stand 15 hours, test and record open-circuit voltage V1, battery is in 50 DEG C of high temperature standing 60 hours, survey
It tries and records open-circuit voltage V2, W=V is calculated1-V2Value, later by all batteries of the group according to spray charging precipitator method
Spray charging precipitator data are tested, as shown in Table 2：
Table two：
From table two it can be concluded that W>When 10.0, the spray charging precipitator of the battery is less than 94%, W<Battery charge when 10
Conservation rate is more than 94%.Number B11, B14 battery is believed that its self discharge is big in table two, should give rejecting, other batteries carry out
It circulates to next process.
The technical solution provided above implementation column of the present invention is described in detail, used herein specifically
Example the principle and embodiment of the embodiment of the present invention are expounded, the explanation of above example is suitable only for helping
Assistant solves the principle of the present invention, there is change place in embodiment, then specific implementation mode and application range according to the present invention,
In conclusion this explanation should not be construed as limiting the invention.
Claims (10)
1. a kind of self discharge detection method of nickle cobalt lithium manganate battery, which is characterized in that include the following steps：
(1) charge and discharge pretreatment is carried out to nickle cobalt lithium manganate battery；
(2) stabilization time will be stood in the first set temperature environment to eliminate battery by pretreated nickle cobalt lithium manganate battery
Polarization, tests and records open-circuit voltage V1；
(3) nickle cobalt lithium manganate battery is stood into the self discharge time in the second set temperature environment, testing and records open circuit electricity
Press V2；
(4) the difference W of V1 and V2 is calculated, then W is compared with setting value, the big electricity of self discharge is picked out according to comparison result
Pond.
2. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 1, it is characterised in that：In step (1)
The pretreated process of charge and discharge is as follows：
(1) nickle cobalt lithium manganate battery is charged into upper voltage limit with the first setting multiplying power, then constant pressure 4.2V charges to cut-off current,
Shelve 10-30min, after again with the first setting multiplying power constant-current discharge to lower voltage limit, the cycle above process 4~6 times；
(2) it is recycled to after being discharged to blanking voltage for the last time, then with the second setting multiplying power constant-current discharge to the first setting voltage
V0, after shelving 30-60min, then with third setting multiplying power constant-current discharge to V0To eliminate polarization, the third setting multiplying power is less than
Second setting multiplying power；
(3) it eliminates and battery is shelved into 30-60min after polarizing, later again with the 4th setting multiplying power constant-current charge to the second setting electricity
Pressure.
3. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 1 or 2, it is characterised in that：It is described steady
Fix time is 10~25 hours.
4. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 1 or 2, it is characterised in that：It is described steady
Fix time is 45~120 hours.
5. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 2, it is characterised in that：Described first sets
It is 0.25C-0.5C to determine multiplying power.
6. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 2, it is characterised in that：Described second sets
It is 0.2C-0.3C to determine multiplying power.
7. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 2, it is characterised in that：The third is set
It is 0.05C-0.15C to determine multiplying power.
8. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 2, it is characterised in that：Described 4th sets
It is 0.05C-0.1C to determine multiplying power.
9. the self discharge detection method of nickle cobalt lithium manganate battery according to claim 2, it is characterised in that：Described first sets
Constant voltage V0For 3.0-3.5V.
10. the self discharge detection method of the nickle cobalt lithium manganate battery according to claim 5~9 any one, feature exist
In：Described second sets voltage as 3.9-4.2V.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109622425A (en) * | 2018-12-12 | 2019-04-16 | 江苏时代新能源科技有限公司 | A method of screening blackspot analyses lithium risk battery core |
| CN109818095A (en) * | 2019-04-03 | 2019-05-28 | 湖北融通高科先进材料有限公司 | Charge and discharge preprocess method and battery of a kind of battery and preparation method thereof |
| CN110297191A (en) * | 2019-08-07 | 2019-10-01 | 深圳市思商科技有限公司 | A kind of self-discharge of battery test method |
| CN110639844A (en) * | 2019-08-26 | 2020-01-03 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method for space aircraft |
| CN111215355A (en) * | 2019-11-22 | 2020-06-02 | 昆山聚创新能源科技有限公司 | Method for screening lithium batteries for discharge |
| CN113075564A (en) * | 2021-03-24 | 2021-07-06 | 骆驼集团新能源电池有限公司 | Screening method for self-discharge of lithium iron phosphate battery |
| TWI751032B (en) * | 2020-02-24 | 2021-12-21 | 大陸商上海蔚來汽車有限公司 | Method, system and device for monitoring battery short circuit |
| CN115951232A (en) * | 2023-03-14 | 2023-04-11 | 苏州时代华景新能源有限公司 | Lithium battery charging and discharging quality detection method and system |
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| CN115951232A (en) * | 2023-03-14 | 2023-04-11 | 苏州时代华景新能源有限公司 | Lithium battery charging and discharging quality detection method and system |
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