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Cylindrical secondary battery and preparation method thereof

A secondary battery, cylindrical technology, applied in the field of cylindrical secondary battery and its preparation, can solve problems such as unsatisfactory safety, safety problems caused by cylindrical batteries, and undiscovered related technologies, and achieve major production Practical significance, improving market application prospects, and ensuring the effect of testing safety

Inactive Publication Date: 2010-01-27
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, related technologies used in cylindrical lithium-ion secondary batteries have not yet been discovered
Cylindrical batteries using organic electrolytes will have a high possibility of organic electrolyte seepage when performing related safety tests and performance tests. The reason is that lithium-ion batteries will generate high temperatures inside the batteries during related tests. The environment and high potential will easily cause the SEI film on the surface of the negative electrode of the battery to decompose on the solid electrolyte interface, and cause the electrolyte solvent to undergo redox decomposition reactions on the surface of the positive and negative electrodes, producing carbon monoxide CO and carbon dioxide CO 2 , ethane C 2 h 6 and other gases, which will cause safety problems for cylindrical batteries and make customers have doubts about battery reliability.
[0005] In addition, most of the existing lithium-ion battery cathode materials are lithium cobalt oxide materials, and the safety performance of cylindrical batteries produced with this material cannot reach a satisfactory level based on years of production experience.

Method used

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  • Cylindrical secondary battery and preparation method thereof
  • Cylindrical secondary battery and preparation method thereof
  • Cylindrical secondary battery and preparation method thereof

Examples

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preparation example Construction

[0037] In order to prepare the cylindrical secondary battery provided by the present invention, the present invention also provides a method for preparing a cylindrical secondary battery, the method comprising the following steps:

[0038] The first step is to coat the gel-like polymer material on the surface of the separator in the electrolyte layer of the battery and dry it;

[0039] The second step is to wind the battery’s positive electrode sheet, negative electrode sheet, and the above-mentioned separator coated with polymer materials into a battery cell, and assemble it in sequence according to the order of rolling groove, liquid injection, and sealing to form a cylindrical battery;

[0040] The third step is to inject the non-aqueous electro-liquid into the casing of the cylindrical battery, and place the battery in a nitrogen-filled negative pressure environment with a temperature of 80-120 ° C, so that the non-aqueous electro-liquid and the polymer material form a gel ...

Embodiment 1

[0052] Preparation of the battery positive plate: 93% lithium iron phosphate LiFePO4, 4% conductive carbon black and 3% polyvinylidene fluoride (PVDF) are mixed in N-methylpyrrolidone (NMP), and evenly coated on the aluminum current collector, Finally, it is dried and compacted at a temperature of 120°C, and the positive electrode sheet is obtained after cutting;

[0053] Preparation of battery negative plate: 90% mesocarbon microspheres (MCMB), 4% conductive carbon black and 3% polyvinylidene fluoride PVDF were mixed in N-methylpyrrolidone NMP, uniformly coated on the copper current collector, Finally, it is dried and compacted at a temperature of 120°C, and the negative electrode sheet is obtained after cutting;

[0054] Preparation of diaphragm: Mix vinylidene fluoride and hexafluoropropylene PVDF-HFP copolymer with an average molecular weight of 500,000 in N-methylpyrrolidone NMP and evenly coat it on a polypropylene (PP) diaphragm with a thickness of 16 μm. 2 μm, then dr...

Embodiment 2

[0058] By adding conductive carbon black and ultra-long nano-carbon fiber (VGCF) to the negative electrode sheet of the battery, the structure and manufacturing method of the specific part are the same as in Example 1, and finally the low-temperature performance of the battery is greatly improved.

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Abstract

The invention discloses a cylindrical secondary battery and a preparation method thereof; the cylindrical secondary battery has excellent safety performance in various performance tests; the preparation method ensures the test safety of the cylindrical secondary battery, reduces the environmental pollution caused by the cylindrical secondary battery, increases the market application prospect of the cylindrical secondary battery and has great production practice significance.

Description

technical field [0001] The invention relates to the technical field of secondary battery manufacturing, in particular to a cylindrical secondary battery and a preparation method thereof. Background technique [0002] At present, due to fundamental factors such as global crude oil demand growing faster than supply growth, heightened geopolitical risks, tight OECD inventories, and capacity bottlenecks in the global refining industry, the global crude oil market remains tense, and international oil prices are expected to remain stable High level operation and violent fluctuation trend. The average price of WTI crude oil in 2008 was US$100 / barrel, and the global crude oil market has remained relatively stable since the beginning of this year. This has led most automobile manufacturers to turn their attention to using electric motors instead of fuel engines, and referring to the report of the International Energy Agency, low-carbon technology is the main direction of energy deve...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/36H01M4/58H01M2/14H01M10/38H01M4/04
Inventor 衣思平武鹏杨景雁
Owner TIANJIN LISHEN BATTERY
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