Oily lithium battery membrane coating treatment method and device
A technology for lithium battery separators and treatment methods, which is applied in the direction of surface coating liquid devices, pretreatment surfaces, coatings, etc., which can solve problems such as unclean solvent extraction, internal defects, and uneven coatings, and achieve the elimination of internal Effects of defects, performance enhancement, good breathability and uniformity
Pending Publication Date: 2019-02-26
ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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Problems solved by technology
[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and device for coating the oily lithium battery diaphragm, which are used to solve the problem of uneven coating in the prior art in the coating process of the oily lithium battery diaphragm. Defects, solvent extraction is not clean, drying is difficult, etc.
Method used
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Embodiment 1
[0053] After the oily slurry lithium battery diaphragm is coated, it passes through a constant temperature and humidity box, the temperature of the constant temperature and humidity box is 40°C, and the relative humidity is 60%, and then it is washed with water in a water tank, and then dried to obtain an oily coating film.
Embodiment 2
[0055] The difference between this embodiment and Embodiment 1 is that the conditions of the constant temperature and humidity chamber in this embodiment are: the temperature is 40° C., the relative humidity is 70%, and other operations are the same as in Embodiment 1. An oily coating film can be obtained.
Embodiment 3
[0057] The difference between this embodiment and Embodiment 1 is that the conditions of the constant temperature and humidity chamber in this embodiment are: the temperature is 50° C., the relative humidity is 60%, and other operations are the same as in Embodiment 1. An oily coating film can be obtained.
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The invention provides an oily lithium battery membrane coating treatment method and device. The coating treatment method at least comprises the steps that firstly, oily slurry is provided, and the surface of a base membrane is coated with the oily slurry to form a coated membrane; then, the coated membrane is placed in a constant-temperature and constant-humidity condition for pretreatment; finally, a solvent in the pretreated coated membrane is extracted, and then the coated membrane is dried. According to the method, the constant-temperature and constant-humidity pretreatment step is addedbefore the extraction process, by means of constant-temperature and constant-humidity pretreatment, a polymer in the slurry can be evenly dispersed in the solvent, the oily slurry can slowly move in amild environment, coating uniformity is achieved, and inherent defects of a coating are eliminated. Besides, the oily slurry can be pre-solidified and separated under the most uniform state, that is,the coated membrane can be preliminarily extracted under a constant-temperature and constant-humidity condition, so that extraction of the solvent in the subsequent extraction step is more thorough,the coated membrane is also easy to dry, and the performance of the coated membrane is greatly improved.
Description
technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a coating treatment method and device for oily lithium battery separators. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high working voltage, no memory effect and long cycle life, and are widely used as power sources for various mobile devices. In the fields of electronic products and electric vehicles, lithium batteries have become indispensable in people's lives. a part of. [0003] Therefore, enterprises have more and more demand for lithium battery separators, and the quality requirements are getting higher and higher. Lithium battery coating film is also becoming more and more important as the main direction of separators. Lithium battery coating is divided into two types: oil-based coating and water-based coating. For the field of oil-based coating, in the traditional process, the slurry is usually...
Claims
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IPC IPC(8): B05D3/00B05D7/00
CPCB05D3/007B05D7/00
Inventor 程跃杨文科何方波陈永乐冯涵阁
Owner ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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