CN109332218A - A kind of detection of lithium ion battery self discharge and combo technique - Google Patents
A kind of detection of lithium ion battery self discharge and combo technique Download PDFInfo
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- CN109332218A CN109332218A CN201811153152.XA CN201811153152A CN109332218A CN 109332218 A CN109332218 A CN 109332218A CN 201811153152 A CN201811153152 A CN 201811153152A CN 109332218 A CN109332218 A CN 109332218A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 17
- 238000007600 charging Methods 0.000 claims abstract description 49
- 230000032683 aging Effects 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 8
- 230000004913 activation Effects 0.000 claims abstract description 6
- 239000003792 electrolyte Substances 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000005955 Ferric phosphate Substances 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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Abstract
The present invention relates to a kind of detection of lithium ion battery self discharge and combo techniques, and its step are as follows: being melted into the lithium battery by having infused electrolyte and activation processing, charging is V1, battery capacity C1 after record chemical conversion by voltage；High temperature ageing is carried out to the battery after chemical conversion, aging temperature is 40 ~ 80 DEG C, and ageing time is 3 ~ 7 days；Reverse charge is carried out to the battery of high temperature ageing, charging is V2 by voltage, records battery capacity C2, calculates the ratio K of C2/C1, selects the biggish battery of self discharge by K value and carries out stepping to remaining battery, battery of the K between 0 ~ R is divided into N grades according to K value；Battery after stepping is subjected to outbound by gear.The biggish battery of self discharge can be quickly and effectively picked out, different shelves is divided the cell into while detection, saves the stepping process of mould group combo section.
Description
Technical field
The present invention relates to the screening of lithium ion battery and combo, more particularly to a kind of detection of lithium ion battery self discharge and
Combo technique.
Background technique
Lithium battery is increasingly used on the products such as mobile phone, electric tool.Due to single lithium battery voltage and appearance
Measure lower, therefore muti-piece lithium battery must be together in series to reach the requirement of these tools by while applying on tool.This
With regard to needing the consistency of these concatenated single batteries very high.
In lithium battery production technology, at present there are two types of the modes of screening battery: 1, battery is charged to half electric state, storage one
It is selected after the section time, is exactly that the flat section of voltage is selected, but battery, in this section, voltage and volume change are unknown
It is aobvious, it is difficult to pick out, and required storage time is long；2, be discharged after battery partial volume (discharge into 2.0 or
2.5V), after storing a period of time, detection bounce voltage is selected, and this method storage time is short, can shorten flow time, still
This method is more demanding to product processing consistency, and battery discharge procedure will lead to a part of battery since polarized state is inconsistent
Self discharge can not be judged by bounce voltage.
Patent 2018100737887 discloses a kind of self discharge detection method of nickle cobalt lithium manganate battery, and the invention is first
When will carry out charge and discharge pretreatment by nickle cobalt lithium manganate battery after partial volume, then stand one section in different temperature environments respectively
Between, open-circuit voltage V1 and V2 are tested, the value of W=V1-V2 is calculated, the biggish battery of self discharge, the party are picked out by the judgement of W value
Method eliminates electrode polarization by pretreatment, reduces polarization and influence of the system unstable factor to voltage pair to greatest extent, but
It is that this method is more demanding to product processing consistency, battery discharge procedure will lead to a part of electricity since polarized state is inconsistent
Pond can not judge self discharge by bounce voltage.
Patent 2017111901166 discloses a kind of self-discharge of battery detection method and lithium battery method for sorting, the hair
It is bright that mesuring battary is discharged to 0% state-of-charge, form the first empty charged pond；By the first empty charged pond under the first preset temperature
The first preset time period is shelved, the second empty charged pond is formed, obtains first voltage；By the second empty charged pond in the second preset temperature
Under shelve the second preset time period, form the empty charged pond of third, obtain second voltage；According to first voltage, second voltage and
Two preset time periods calculate the self-discharge rate of mesuring battary, and measuring process is simple, and measurement cost is low, but will be by putting twice
It sets, it is required to select overlong time.
Patent 201110388882X discloses a kind of self-discharge detection method for lithium iron phosphate batteries, which fills battery
Full electricity is shelved in the uniform magnetic field that magnetic field strength is 0.01-1.3T, and the effect using high-intensity magnetic field to ferric phosphate lithium cell adds
The self discharge of fast battery is taken out from high-intensity magnetic field after placing 1-15 days, and the self-discharge rate of battery is shelved in test after demagnetization, according to
Actual measurement self-discharge rate data can pick out the battery of self discharge attribute abnormal, but required detection time is too long.
Summary of the invention
The one kind provided the purpose of the present invention is to solve the deficiency of the prior art can be selected in a short time to be come from
Discharge big battery, and the battery combo for avoiding self discharge big causes the inconsistent of whole group battery into battery pack, and then improves electricity
The service life of pond group, by battery stepping, saves the stepping process of combo section while selecting self discharge.
To achieve the purpose of the present invention, the technical solution adopted by the present invention are as follows:
A kind of detection of lithium ion battery self discharge and combo technique, its step are as follows:
(1) lithium battery by having infused electrolyte and activation processing is melted into, charging is V1 by voltage, after record chemical conversion
Battery capacity C1；
(2) high temperature ageing is carried out to the battery after chemical conversion, aging temperature is 40 ~ 80 DEG C, and ageing time is 3 ~ 7 days；
(3) reverse charge is carried out to the battery of high temperature ageing, charging is V2 by voltage, records battery capacity C2, calculates C2/C1
Ratio K, by K value select the biggish battery of self discharge and to remaining battery carry out stepping, the K be more than or equal to R battery
For the big battery of self discharge, i.e. unqualified battery, battery of the K between 0 ~ R is divided into N grades according to K value；
(4) battery after stepping is subjected to outbound by gear.
Preferably, R is 4%-10%.
Preferably, N >=2.
Preferably, charging by voltage be V1 and charging by voltage be V2 be equal to the charging of battery in actual use cut
To voltage.
Preferably, chemical synthesis technology are as follows: first with 0.02C charging 300min, then with 0.05C constant-current charge to battery actual use
When charging by voltage；The reversely charging galvanic process of the step (3) are as follows: in actual use with 0.3C constant-current constant-voltage charging to battery
Charging by voltage, electric current to 0.05C ends.
Preferably, charging is V1 by voltage and charging be V2 by voltage is the charging of battery in actual use by electricity
The 90%-99% of pressure.
Preferably, chemical synthesis technology is identical with the environment temperature of reversely charging galvanic process, it is 20 DEG C -40 DEG C.
Beneficial effects of the present invention: the biggish battery of self discharge can be quickly and effectively picked out, avoids self discharge biggish
When battery and normal battery are connected together for circuit power supply, the performance decline and shakiness of whole group power supply circuit often will cause
It is fixed；Different shelves can be divided the cell into while detection, save the stepping process of mould group combo section, the battery of same class
Performance is close, so that battery life is longer, performance is more stable；Detection cycle is short, and method is simply easily realized, production operation side
Just, production efficiency is improved.
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and its advantageous effects, below in conjunction with comparing
The present invention will be described in further detail with specific embodiment for example.It should be understood that the specific implementation of this specification description
Example is not intended to limit the present invention merely to the explanation present invention.
Comparative example 1(is originated from patent 2017111901166)
Mesuring battary is discharged to 0% state-of-charge, forms the first empty charged pond；Described first empty charged pond is preset first
At a temperature of shelve the first preset time period, form the second empty charged pond, measure the described second empty charged pond, obtain first voltage；
The second preset time period is shelved into described second empty charged pond under the second preset temperature, the empty charged pond of third is formed, measures institute
The empty charged pond of third is stated, second voltage is obtained；According to the first voltage, the second voltage and second preset time period
Calculate the self-discharge rate of the mesuring battary.
Embodiment 1
(1) lithium battery by having infused electrolyte and activation processing is melted into, charging is V1 by voltage, after record chemical conversion
Battery capacity C1；
(2) high temperature ageing is carried out to the battery after chemical conversion, aging temperature is 40 ~ 80 DEG C, and ageing time is 3 ~ 7 days；
(3) reverse charge is carried out to the battery of high temperature ageing, charging is V2 by voltage, records battery capacity C2, calculates C2/C1
Ratio K, by K value select the biggish battery of self discharge and to remaining battery carry out stepping, the K be more than or equal to R battery
For the big battery of self discharge, i.e. unqualified battery, battery of the K between 0 ~ R is divided into N grades according to K value；
(4) battery after stepping is subjected to outbound by gear.
Wherein R is 4%-10%.
Wherein N >=2.
Wherein in step (1) charging by voltage be V1 and step (3) in charging by voltage be that V2 is equal to battery
Charging in actual use is by voltage.
The wherein chemical synthesis technology of step (1) are as follows: first with 0.02C charging 300min, then with 0.05C constant-current charge to battery reality
Charging when border uses is by voltage；The reversely charging galvanic process of the step (3) are as follows: with 0.3C constant-current constant-voltage charging to battery reality
By voltage, electric current to 0.05C ends for charging when use.
Wherein step (1) is identical with the environment temperature of step (3), is 20 DEG C -40 DEG C.
Comparative examples 1 and embodiment 1 are shelved twice as can be seen that being needed not move through using the present invention, can be shortened certainly
The discharge examination time, and measurement result is relatively reliable, it is practical and efficient, accurate and effective is tested, product quality is substantially increased, keeps away
Exempting from self discharge big battery influences whole group battery with two side terminals, to extend the service life of battery pack.
Comparative example 2(is originated from patent 2018100737887)
(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 eliminate battery
Open-circuit voltage V1 is tested and is recorded in polarization, is known as this period stablizing the time；
(3) ternary lithium ion battery is stood to a period of time in the second set temperature environment again, tests and records open-circuit voltage
V2 is known as the self discharge time this period；
(4) the difference W of V1 and V2 is calculated, then W value is compared with setting value, the big battery of self discharge is picked out in judgement.
The first set temperature that ternary lithium ion battery is stood is 25 ± 5 DEG C of room temperature, and the second set temperature is
55 ± 5 DEG C, stablizing the time is 11~25 hours, and the self discharge time is 45~125 hours, shelves the time in step (1) and is
50min, it is 40min that the time is shelved in step (2), and it is 50min that the time is shelved in step (3).
Embodiment 2
(1) be melted by the ferric phosphate lithium cell of the rated capacity 55AH that infuse electrolyte and activation processing, elder generation with
0.02C charging 300min, then with 0.05C constant-current charge to 3.65V, record charging capacity is C1；
(2) high temperature ageing is carried out to the battery after chemical conversion, aging temperature is 60 DEG C, and ageing time is 4 days；
(3) reverse charge, 0.3C constant-current constant-voltage charging to 3.65V are carried out to the battery of high temperature ageing, electric current to 0.05C ends, note
Record charging capacity is C2, calculates the ratio K of C2/C1, the battery of K >=5% is the big battery of self discharge, i.e. unqualified battery, by K
Battery before 0 ~ 5% is divided into 5 grades according to K value；
0 ~ 1% is A grades；
1% ~ 2% is B grades；
2% ~ 3% is C grades；
3% ~ 4% is D grades；
4% ~ 5% is E grades；
(4) battery after stepping is subjected to outbound by gear.
Comparative examples 2 and embodiment 2 are as can be seen that few using present invention process, and battery is through chemical conversion, aging, reverse charge
Operation can be detected out as a result, easy to operate, can shorten self discharge detection time, and measurement result is relatively reliable, practical
Efficiently, accurate and effective is tested, product quality is substantially increased, self discharge big battery is avoided to influence whole group battery with two side terminals, from
And extend the service life of battery pack.
Comparative example 3(is originated from patent 201110388882X)
It is first once discharged mesuring battary, recharge process, records the charging capacity Ci of battery；Again by battery in magnetic field
Intensity is to carry out self discharge in the uniform magnetic field of 0.01~1.3T to shelve, and then takes out battery, recharges after demagnetization, records
Battery charge capacity Cs；R=(Cs/Ci) × 100% is finally calculated,
According to the actual situation, battery of the R value more than or equal to 2.5%~5% is set as unqualified battery.Self-discharge of battery is shelved
Environment temperature be 45 DEG C~55 DEG C, the time be 1~15 day.
Embodiment 3
(1) lithium battery by having infused electrolyte and activation processing is melted into, charging is V1 by voltage, after record chemical conversion
Battery capacity C1；
(2) high temperature ageing is carried out to the battery after chemical conversion, aging temperature is 40 ~ 80 DEG C, and ageing time is 3 ~ 7 days；
(3) reverse charge is carried out to the battery of high temperature ageing, charging is V2 by voltage, records battery capacity C2, calculates C2/C1
Ratio K, by K value select the biggish battery of self discharge and to remaining battery carry out stepping, the K be more than or equal to R battery
For the big battery of self discharge, i.e. unqualified battery, battery of the K between 0 ~ R is divided into N grades according to K value；
(4) battery after stepping is subjected to outbound by gear.
Wherein R is 4%-10%.
Wherein N >=2.
Wherein in step (1) charging by voltage be V1 and step (3) in charging by voltage be that V2 is equal to battery
Charging in actual use is by voltage.
The wherein chemical synthesis technology of step (1) are as follows: first with 0.02C charging 300min, then with 0.05C constant-current charge to battery reality
Charging when border uses is by voltage；The reversely charging galvanic process of the step (3) are as follows: with 0.3C constant-current constant-voltage charging to battery reality
By voltage, electric current to 0.05C ends for charging when use.
Wherein step (1) is identical with the environment temperature of step (3), is 20 DEG C -40 DEG C.
Comparative examples 3 and embodiment 3 are as can be seen that use present invention process method, battery is through chemical conversion, aging, reversely charging
It is electrically operated to can be detected out as a result, easy to operate, it is not required to for battery to be placed in self discharge in magnetic field, is not required to shelve 1-15 days, only
It needs high temperature ageing 3-7 days, self discharge detection time can be shortened, and measurement result is relatively reliable, practical and efficient, test is accurate
Effectively, product quality is substantially increased, avoids self discharge big battery from influencing whole group battery with two side terminals, to extend battery pack
Service life.
According to the disclosure and teachings of the above specification, fields of the present invention obtain technical staff can also be to above-mentioned implementation
Mode is changed and is modified, and therefore, the present invention is not limited to above-mentioned specific embodiment, all those skilled in the art
Any conspicuous improvement, the replacement or modification that member is made on the basis of the present invention belong to protection model of the invention
It encloses.
Claims (7)
1. a kind of lithium ion battery self discharge detection and combo technique, which comprises the following steps:
(1) lithium battery by having infused electrolyte and activation processing is melted into, charging is V1 by voltage, after record chemical conversion
Battery capacity C1；
(2) high temperature ageing is carried out to the battery after chemical conversion, aging temperature is 40 ~ 80 DEG C, and ageing time is 3 ~ 7 days；
(3) reverse charge is carried out to the battery of high temperature ageing, charging is V2 by voltage, records battery capacity C2, calculates C2/C1
Ratio K, by K value select the biggish battery of self discharge and to remaining battery carry out stepping, the K be more than or equal to R battery
For the big battery of self discharge, i.e. unqualified battery, battery of the K between 0 ~ R is divided into N grades according to K value；
(4) battery after stepping is subjected to outbound by gear.
2. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that the R is 4%-
10%。
3. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that N >=2.
4. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that the step (1)
It is middle charging by voltage be V1 and step (3) in charging by voltage be V2 be equal to the charging of battery in actual use by
Voltage.
5. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that the step (1)
Chemical synthesis technology are as follows: first with 0.02C charge 300min, then with the charging of 0.05C constant-current charge to battery in actual use by
Voltage；The reversely charging galvanic process of the step (3) are as follows: with the charging in actual use of 0.3C constant-current constant-voltage charging to battery by electricity
Pressure, electric current to 0.05C end.
6. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that the step (1)
Middle charging by voltage be V1 and step (3) in charging be V2 by voltage be the charging of battery in actual use by voltage
90%-99%.
7. lithium ion battery self discharge detection as described in claim 1 and combo technique, which is characterized in that the step (1)
It is identical with the environment temperature of step (3), it is 20 DEG C -40 DEG C.
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| CN111136033A (en) * | 2020-01-08 | 2020-05-12 | 山东精工电源科技有限公司 | Screening method for consistency of lithium ion batteries |
| CN112354897A (en) * | 2020-07-22 | 2021-02-12 | 万向一二三股份公司 | Screening method for cell consistency in practical application process of lithium ion battery |
| CN112354897B (en) * | 2020-07-22 | 2022-04-12 | 万向一二三股份公司 | Screening method for cell consistency in practical application process of lithium ion battery |
| CN112114266A (en) * | 2020-09-21 | 2020-12-22 | 郑州中科新兴产业技术研究院 | Method for realizing battery screening and grouping in one step |
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