CN106129506B - A kind of compound method for lithium ion battery - Google Patents
A kind of compound method for lithium ion battery Download PDFInfo
- Publication number
- CN106129506B CN106129506B CN201610664378.0A CN201610664378A CN106129506B CN 106129506 B CN106129506 B CN 106129506B CN 201610664378 A CN201610664378 A CN 201610664378A CN 106129506 B CN106129506 B CN 106129506B
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- battery
- voltage
- chemical conversion
- lithium ion
- ion battery
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to field of lithium ion battery, disclose a kind of compound method for lithium ion battery, and maximum feature is: will first be melted into after battery coupled in series, until being changed to parallel connection after certain voltage, then chemical conversion is until blanking voltage.The present invention characteristic completely the same using series circuit current, it is melted at formation of Li-ion batteries initial stage with the electric current of same size, the good SEI film of consistency can be formed, be changed to chemical conversion in parallel in chemical conversion latter stage, using the identical factor of parallel circuit voltage, the consistency of cell voltage ensure that.
Description
Technical field
The present invention relates to field of lithium ion battery, and in particular to a kind of compound method for lithium ion battery.
Background technique
With environmental protection demand and energy shortage situation, explosive growth is presented in the demand of power battery, although with
The progress of science and technology, power battery have considerable improvement in safety and aspect of performance, but battery with two side terminals be still influence it is dynamic
One of an important factor for power battery performance.
In all multi-process of battery production, chemical conversion is the ring being even more important, and main purpose is exactly in initial charge
In the process, one layer of solid electrolyte film (SEI film) is formed in electrode material surface, the performance of SEI film will directly determine battery
Cycle performance and battery with two side terminals.Actually SEI film has been basically formed in the chemical conversion middle and later periods, and its properity and change
There are much relations at charging current, existing most chemical synthesis technology mode is battery parallel connection chemical conversion, and this mode ensure that electricity
Cell voltage is identical, but leads to battery current meeting different from, such electrode due to the difference of battery or the limitation of formation device
The structure and performance of the SEI film at table material interface will also will be different.
Summary of the invention
Based on above-mentioned purpose, the present invention discloses a kind of novel lithium battery chemical synthesizing method, utilizes series circuit current complete one
The principle of cause, in the first of Battery formation, mid-term using series connection low current chemical conversion, to form densification and the good SEI film of consistency, separately
Outside in view of lithium ion battery charging terminal voltage can sharply increase, the last stages of chemical conversion by the way of constant voltage and current limiting simultaneously
Connection chemical conversion prevents over-charging of battery consistent with cell voltage is guaranteed.
The technical scheme is that
1) 20-24h is stood after the battery of moisture qualification being injected electrolyte by technique, pole piece and diaphragm is allowed sufficiently to infiltrate electricity
Solve liquid；
2) the battery coupled in series terminated will be stood；
3) circuit low current charge is connected to be melted into a limitation voltage；
4) battery is changed to parallel connection, charging chemical conversion to blanking voltage；
5) cell voltage is measured, a qualified voltage value is set, the battery that voltage is more than or equal to the qualified voltage value is flowed into
Next process, unqualified battery are concentrated by step 1-4 two times chemical conversions；It is preferred that the qualified voltage value is 3.3V.
Above-mentioned series connection chemical conversion limitation voltage difference lithium salts and organic solvent according to used in electrolyte and it is different, when for
LiPF6When/EC/PC system limit voltage be 3.2V, parallel connection chemical conversion blanking voltage material according to used in battery and not
Together, LiFePO4 3.65V.
Above-mentioned series connection is melted into low current used and refers to that rate of charge is 0.02C -0.05C, and parallel connection chemical conversion high current used, which refers to, fills
Electric multiplying power is 0.1-0.3C.
The beneficial effects of the present invention are:
The present invention characteristic completely the same using series circuit current, at formation of Li-ion batteries initial stage with the electric current of same size
Chemical conversion, can form the good SEI film of consistency, be changed to chemical conversion in parallel in chemical conversion latter stage, identical using parallel circuit voltage
Factor ensure that the consistency of cell voltage.The experimental results showed that the lithium ion battery that chemical synthesizing method of the invention obtains has
Higher capacity, preferable internal resistance consistency and excellent cycle performance.
Specific embodiment
The present invention is illustrated below by embodiment and comparative example.
Embodiment
Make the rectangular aluminum-shell battery of model 20100140, capacity 25Ah, the pre-production and producing line battery of battery
Technique is identical, and chemical conversion carries out as follows:
1, by battery coupled in series；
2,5min is stood；
3, constant-current charge: 0.02C charging limits voltage 3.2V, in limited time 240min；
4,5min is stood；
5, battery is changed to parallel connection；
6, constant-current constant-voltage charging: 0.2C charging, blanking voltage 3.65V, cut-off current 0.02C；240min in limited time；
7,5min is stood；
8, cell voltage is tested, the battery by voltage less than 3.3V is chosen, and carries out secondary chemical conversion according to step 1 to 7.
Electric performance test is carried out to the lithium ion battery of the present embodiment, tests capacity, internal resistance and the circulation of lithium ion battery
100 weeks capacity retention ratios, see Table 1 for details for test result.
Comparative example
The rectangular aluminum-shell battery of same production model 20100140, capacity 25Ah, the pre-production and producing line of battery
Battery process is identical, and chemical conversion carries out as follows:
1, by battery parallel connection；
2,5min is stood；
3, constant-current charge: 0.02C charging limits voltage 3.2V, in limited time 240min；
4,5min is stood；
5, constant-current constant-voltage charging: 0.2C charging, blanking voltage 3.65V, cut-off current 0.02C；240min in limited time；
6,5min is stood；
7, cell voltage is tested, the battery by voltage less than 3.3V is chosen, and carries out secondary chemical conversion according to step 1 to 7.
Electric performance test is carried out to the lithium ion battery of this comparative example, tests capacity, internal resistance and the circulation of lithium ion battery
100 weeks capacity retention ratios, see Table 1 for details for test result.
Table 1
It is higher than the lithium of comparative example using the average size of the lithium ion battery of chemical synthesizing method of the present invention as can be seen from Table 1
The battery of the average size of ion battery, internal resistance and internal resistance standard deviation again smaller than comparative example；And embodiment battery 100 weeks recycle
Capacity retention ratio is equally higher than comparative example battery afterwards.The lithium ion battery that chemical synthesizing method of the invention obtains appearance with higher
Amount, preferable internal resistance consistency and excellent cycle performance.
The announcement of book according to the above description, those skilled in the art in the invention can also carry out in above embodiment
Change and modification.Therefore, the invention is not limited to specific embodiments, and all those skilled in the art are on basis of the invention
On the conspicuous improvement made or change belong to the scope of the present invention, such as change series connection chemical conversion and chemical conversion in parallel
Blanking voltage, change chemical conversion size of current, i.e., using any embodiment of chemical conversion in parallel after first series connection chemical conversion, in the present invention
Protection scope.
Claims (2)
1. a kind of compound method for lithium ion battery, which is characterized in that this method carries out as follows:
1) 20-24h is stood after the battery of moisture qualification being injected electrolyte, pole piece and diaphragm is allowed sufficiently to infiltrate electrolyte；
2) the battery coupled in series terminated will be stood；
3) connect circuit low current, difference lithium salts and organic solvent according to used in electrolyte and by each single battery charging be melted into extremely
Certain restrictions voltage；
4) battery is changed to parallel connection, large current charge is melted into blanking voltage；
5) cell voltage is measured, a qualified voltage value is set, the battery that voltage is more than or equal to the qualified voltage value is flowed into next
Procedure, unqualified battery are concentrated by step 2-4 two times chemical conversions；
Wherein, low current used in being melted into of connecting refers to that rate of charge is 0.02C -0.05C, and parallel connection chemical conversion high current used refers to charging
Multiplying power is 0.1-0.3C.
2. a kind of compound method for lithium ion battery as described in claim 1, it is characterised in that: the electrolyte is LiPF6/EC/
PC system, the positive electrode of battery are LiFePO4, and series connection chemical conversion limitation voltage is 3.2V, and parallel connection chemical conversion blanking voltage is
3.65V。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610664378.0A CN106129506B (en) | 2016-08-12 | 2016-08-12 | A kind of compound method for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610664378.0A CN106129506B (en) | 2016-08-12 | 2016-08-12 | A kind of compound method for lithium ion battery |
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| Publication Number | Publication Date |
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| CN106129506A CN106129506A (en) | 2016-11-16 |
| CN106129506B true CN106129506B (en) | 2019-07-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167114B (en) * | 2018-08-28 | 2020-07-03 | 陕西中丰新能源有限公司 | Method for forming four large-capacity square batteries in series connection |
| CN109167115A (en) * | 2018-08-28 | 2019-01-08 | 陕西中丰新能源有限公司 | A kind of large capacity cylindrical battery chemical synthesis technology |
| CN109524731A (en) * | 2018-12-29 | 2019-03-26 | 珠海泰坦新动力电子有限公司 | Series connection formation device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872879A (en) * | 2010-06-01 | 2010-10-27 | 奇瑞汽车股份有限公司 | Chemical combination method of lithium-ion recharging battery |
| CN102208685B (en) * | 2011-05-04 | 2013-07-10 | 恒正科技（苏州）有限公司 | Processing method for formation of lithium ion batteries |
| CN102299385A (en) * | 2011-07-29 | 2011-12-28 | 南京双登科技发展研究院有限公司 | Soft package lithium iron phosphate power battery initial charge formation method |
| CN102403536B (en) * | 2011-11-30 | 2013-11-06 | 南京双登科技发展研究院有限公司 | Formation method for cylindrical lithium battery |
| CN103187592A (en) * | 2011-12-29 | 2013-07-03 | 陆文周 | Automatic formation and detection production line of power lithium batteries |
| CN103165943B (en) * | 2013-03-14 | 2015-05-20 | 杭州固恒能源科技有限公司 | Storage battery formation method, circuit and device |
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