CN105428723A - Method for judging effectiveness of lithium ion battery cell baking process - Google Patents
Method for judging effectiveness of lithium ion battery cell baking process Download PDFInfo
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- CN105428723A CN105428723A CN201510979371.3A CN201510979371A CN105428723A CN 105428723 A CN105428723 A CN 105428723A CN 201510979371 A CN201510979371 A CN 201510979371A CN 105428723 A CN105428723 A CN 105428723A
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- voltage
- baking process
- lithium
- time curve
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M10/04—Construction or manufacture in general
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
Abstract
The invention provides a method for judging the effectiveness of a lithium ion battery cell baking process. According to the method, a lithium ion battery standard formation voltage-time curve (1) and a lithium ion battery actual formation voltage-time curve (2) are established, then the standard formation voltage-time curve (1) and the actual formation voltage-time curve (2) are compared, and in particular, the rise speed of formation voltage along with time within initial 10-60 min is focused on so that the effectiveness of the lithium ion battery cell baking process can be judged. Compared with the conventional Karl Fischer moisture measurement method, the method is relatively simpler, the effectiveness of the lithium ion battery cell baking process can be quickly judged, and whether the battery cell baking process can influence the cycle performance of a lithium ion battery or not can be estimated.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of determination methods of lithium-ion electric core baking process validity.
Background technology
Lithium ion battery is widely used on new-energy automobile, electric bicycle, electric tool and portable electric appts because of advantages such as its operating voltage are high, specific energy is high, cycle life is good, has wide market application foreground.The same dust of moisture, burr to become in lithium ion battery manufacture process three side by side to be affected one of key factor of battery quality and fail safe and enjoys people to pay close attention to greatly, battery core baking removes moisture important procedure in lithium ion battery manufacture process, after battery core baking, how many moisture entrapment directly affects battery performance, especially cycle performance of battery.Battery core baking is insufficient, causes battery performance to worsen and even scraps; Baking time is long, can cause again mass energy waste and production efficiency low.Tradition judges that the method that battery core toasts rear moisture entrapment how many in high dew point environment, disassembles battery core and gets pole piece sample, then Ka Feixiu moisture measurement standard measure is adopted to record pole piece moisture, owing to being subject to sample position, sampling process and test result drift effect, single test result cannot represent the rear pole piece overall moisture residual condition of battery baking, therefore need repeatedly retest and collect large quantity of moisture test data, could judge after adding battery performance test that whether baking process is effective, the whole test process cycle is oversize, affects efficiency.
Summary of the invention
In order to overcome the above-mentioned shortcoming of existing method of testing, the invention provides a kind of fast qualitative determination methods of lithium-ion electric core baking process validity.
For achieving the above object, the technical solution used in the present invention is: the fast qualitative determination methods of lithium-ion electric core baking process validity, carries out according to the following steps:
Step one, according to abundant baking process setting baking temperature, baking vacuum degree and baking time, lithium-ion electric core is through fully baking, through procedures such as note electrolyte, block welding, sealing, cleanings after cooling, formation charging is carried out again according to being standardized into technique, record the changing value of lithium ion battery voltage with the charging interval, set up battery standard formation voltage-time graph 1, this is standardized into voltage-time curve is the standard reference figure that the design of corresponding specific products, processing procedure factor and control with raw material remain unchanged;
Step 2, toast battery core by predetermined baking process, then by same procedure in step one, the lithium ion battery voltage recorded under this baking process parameter is worth over time, sets up actually to change into voltage-time curve 2;
Step 3, change into voltage-time curve 2 by actual and be standardized into voltage-time curve 1 and compare.When all other factorses remain unchanged, be starkly lower than the voltage increase rate of the lithium ion battery of fully baking owing to toasting insufficient lithium ion battery voltage increase rate in formation process, and can reach maximum at certain time point voltage difference.If this baking process is effective to battery core moisture removal, its formation voltage-time graph should with to be standardized into voltage-time curve basically identical, so can fast, accurately, the validity of qualitative evaluation lithium-ion electric core baking process.
Except lithium-ion electric core actual baking process and abundant baking process may different except, other factors comprise product design, production technology, key equipment, product raw material, the control of production ambient moisture, chemical synthesis technology etc. and all should be consistent.
The abundant baking process parameter of described lithium-ion electric core is: baking temperature 80-100 DEG C, baking time >=20 hour, baking vacuum degree≤-90kPa.
In described lithium-ion electric core production process, electrolyte moisture and fluid injection ambient moisture control overflow meet technological standards.
Described lithium-ion electric core is standardized into technique: normal temperature or high temperature ageing 12-72 hour, charging current 0.01-0.15C, charging interval 1.5-3 hour.
The described voltage-time curve (1) that is standardized into compares with the actual voltage-time curve (2) that changes into, changing in starting stage 10-60min, what each time point was corresponding be standardized into voltage-time curve and the actual difference changing into voltage-time curve voltage all in 0 ~ ± 15mV, then judge that this lithium-ion electric core baking process is effective.
The determination methods of lithium ion battery baking process validity provided by the invention, can avoid indirectly judging the shortcomings such as the retest of baking process validity, cycle longer, complex operation conventionally by moisture measurement; Avoid the impact because drifting about by sample position, sampling process and test result, single test result cannot represent battery baking posterior restoration pole piece moisture entrapment situation simultaneously.Meanwhile, after this determination methods can also reflect baking, pole piece residual moisture affects battery performance.
Accompanying drawing explanation
Fig. 1: the lithium ion battery formation voltage-time graph comparison diagram of different baking process parameter:
Wherein, 1-be standardized into voltage-time curve, 2-actually change into voltage-time curve (baking process parameter: temperature 65 DEG C, 12 hours time, vacuum degree-95kPa).
Fig. 2: the lithium ion battery circulation volume conservation rate comparison diagram of different baking process parameter:
Wherein, the lithium ion battery circulation volume conservation rate curve of 3-abundant baking process, the lithium ion battery circulation volume conservation rate curve (baking process parameter: temperature 65 DEG C, 12 hours time, vacuum degree-95kPa) of 4-actual baking process.
Embodiment
Below in conjunction with drawings and Examples, particular content of the present invention is set forth.
Embodiment 1
The main raw material(s) of the lithium ion battery that this embodiment is all has: positive pole (ternary, PVDF, aluminium foil), negative pole (graphite, SBR, CMC, Copper Foil), electrolyte (LiPF6, EC, EMC, PC), barrier film (PP/PE/PP), nickel lug (Ni), box hat (Fe), gummed paper (PP, polyimides), spacer ring (PP).
In the present embodiment, the technological process of production of lithium-ion electric core to be baked is: battery core toast-notes electrolyte-welding block-cleaning-ageing-change into, and constant processing procedure factor comprises: note electrolyte content and ambient humidity, Aging Temperature and time, chemical synthesis technology.
Criterion formation voltage-time graph:
Lithium-ion electric core is fully toasted by following baking process: baking time 24 hours, baking temperature 85 DEG C, baking vacuum degree-97kPa; Produce by normal process after baking, then ageing 48 hours, carry out constant current charge 3 hours by 0.05C current, measuring voltage is worth over time, obtains being standardized into voltage-time curve 1(as shown in Figure 1).
Set up and actually change into voltage-time curve:
Lithium-ion electric core is toasted by following baking process: baking temperature 85 DEG C, baking time 6 hours, baking vacuum degree-95kPa; Produce by normal process after baking, and carry out formation charging by identical charge technology, measuring voltage is worth over time, obtains actually changing into voltage-time curve 2(as shown in Figure 1).
As seen from Figure 1, when formation charging 25min, actually changing into voltage-time curve 2 and to be standardized into voltage-time curve 1 corresponding voltage difference maximum, is 189mV, illustrate compared with abundant baking process, this baking process effectively cannot remove the moisture in lithium-ion electric core.Meanwhile, as can be seen from Fig. 2 also, this baking process has a significant effect to cycle performance of lithium ion battery.
The above embodiment only have expressed the of the present invention several execution mode under fixing roasting plant prerequisite, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention, when controlling other factors and being constant, when considering how many a certain key elements qualitatively judges because introducing moisture and compare, the present invention all has reference, as baking process can be kept identical, and the qualitative judgement etc. that qualitative evaluation electrolyte raw material moisture is how many.Without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1. a determination methods for lithium-ion electric core baking process validity, is characterized in that comprising the steps:
Step one, lithium-ion electric core fully to be toasted, set up lithium ion battery and be standardized into voltage-time curve (1);
Step 2, lithium-ion electric core to be toasted by predetermined baking process, set up that the lithium ion battery of this baking process is actual changes into voltage-time curve (2);
Step 3, change into voltage-time curve (2) by actual and be standardized into voltage-time curve (1) and compare, the validity of Fast Evaluation battery core baking process parameter.
2. the determination methods of a kind of lithium-ion electric core baking process validity according to claim 1, it is characterized in that: the technological parameter that lithium-ion electric core fully toasts is: baking temperature is 80 DEG C-100 DEG C, baking time >=20 hour, baking vacuum degree≤-90kPa.
3. the determination methods of a kind of lithium-ion electric core baking process validity according to claim 1, it is characterized in that: step 2 except baking process may different from step one except, product design, production technology, key equipment, product raw material, production ambient moisture controls, chemical synthesis technology all keeps identical.
4. the determination methods of a kind of lithium-ion electric core baking process validity according to claim 1, it is characterized in that: by actual change into voltage-time curve (2) be standardized into voltage-time curve (1) compare time, especially pay close attention to and change into voltage climbing speed in time in initial 10-60min; Be standardized into voltage-time curve (1) and the actual difference changing into the voltage of voltage-time curve (2) in 0 ~ ± 15mV, be all judged as that this battery core baking process is effective changing into certain time point correspondence in starting stage 10-60min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510979371.3A CN105428723A (en) | 2015-12-23 | 2015-12-23 | Method for judging effectiveness of lithium ion battery cell baking process |
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| CN201510979371.3A CN105428723A (en) | 2015-12-23 | 2015-12-23 | Method for judging effectiveness of lithium ion battery cell baking process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109164146A (en) * | 2018-11-12 | 2019-01-08 | 桑顿新能源科技有限公司 | A method of water content is judged by being melted into curve |
| CN113884908A (en) * | 2021-09-17 | 2022-01-04 | 江苏海基新能源股份有限公司 | Method for judging water combination and separation lattices of baked lithium ion battery |
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| CN102736034A (en) * | 2012-06-29 | 2012-10-17 | 力神迈尔斯动力电池系统有限公司 | Method for detecting internal states of lithium ion batteries and nondestructively screening lithium ion batteries |
| CN102768343A (en) * | 2012-07-30 | 2012-11-07 | 浙江南博电源科技有限公司 | Method for evaluating positive-negative capacity matching situation of lithium ion secondary battery |
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2015
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Patent Citations (3)
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| CN102736034A (en) * | 2012-06-29 | 2012-10-17 | 力神迈尔斯动力电池系统有限公司 | Method for detecting internal states of lithium ion batteries and nondestructively screening lithium ion batteries |
| CN102768343A (en) * | 2012-07-30 | 2012-11-07 | 浙江南博电源科技有限公司 | Method for evaluating positive-negative capacity matching situation of lithium ion secondary battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109164146A (en) * | 2018-11-12 | 2019-01-08 | 桑顿新能源科技有限公司 | A method of water content is judged by being melted into curve |
| CN113884908A (en) * | 2021-09-17 | 2022-01-04 | 江苏海基新能源股份有限公司 | Method for judging water combination and separation lattices of baked lithium ion battery |
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