A kind of drying method of lithium-ion battery pole piece
A lithium-ion battery, drying method technology, applied in battery electrodes, drying solid materials, method combination to dry solid materials and other directions, can solve problems such as safety hazards, unstable battery performance, battery bulging, etc. The effect of battery performance and safety, the effect of good practicability
Active Publication Date: 2015-08-19
奇瑞新能源汽车股份有限公司
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Problems solved by technology
In the above cutting and sorting process, the pole piece is easy to absorb water, which will cause the water in the pole piece to react with the electrolyte to generate gas during the charging and discharging process, resulting in battery swelling and battery performance instability or decline. and bring security risks
Method used
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Embodiment 1
[0029] Such as figure 1 As shown, the drying method of the lithium ion battery pole piece of the present embodiment comprises the steps:
[0030] A: Put the battery pole piece into the drying box;
[0031] B: Use vacuum equipment to extract the gas in the drying box, reduce the air pressure in the drying box to -0.1Mpa, and keep the air pressure in the drying box at -0.1Mpa for 3 to 5 minutes, and then turn off the vacuum equipment;
[0032] C: Use heating equipment to heat the drying oven to raise the temperature of the drying oven to 75-110°C and keep it for 3-5 hours;
[0033] D: Fill the dry box with pure dry nitrogen, and after 5 to 30 minutes, use vacuum equipment to extract the gas in the dry box to reduce the air pressure in the dry box to -0.1Mpa, and keep the air pressure in the dry box at - 3 to 5 minutes at 0.1Mpa, then turn off the vacuum equipment;
[0034] E: After repeating steps C to D for 3 to 5 cycles, turn off the heating equipment; after the temperature...
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The invention discloses a drying method of lithium ion battery pole pieces. By adopting the method, positive pole pieces and negative pole pieces can be dried sufficiently so that the pole pieces with good performance can be obtained. The drying method includes the following steps: A the battery pole pieces are placed into a drying box; B air pressure in the drying box is reduced to be the preset low pressure through a vacuumizing device lasting for a first preset time, and then the vacuumizing device is closed; C the drying box is heated through a heating device, temperature in the drying box rises to the preset high temperature lasting for a second preset time; D clean dry inert gases are filled into the drying box lasting for a third preset time, then air pressure in the drying box is reduced to be the preset pressure through the vacuumizing device lasting for the first preset time, and the vacuumizing device is closed; E the step C and the step D are repeated for a plurality of cycles and then the heating device is closed; the pole pieces are taken out after temperature of the drying box is reduced to be the room temperature.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a drying method for pole pieces of lithium ion batteries. Background technique [0002] In today's rapidly developing society, traditional energy sources such as oil, coal, and natural gas are decreasing as people increasingly exploit them. Lithium-ion batteries have gradually become an effective solution to the environmental and energy problems faced by modern civilization due to their advantages of cleanliness, environmental protection, and high efficiency. method is widely favored by people. At present, lithium-ion batteries are widely used in products such as notebooks, video cameras, digital cameras, mobile phones, and electric tools. [0003] The production process of the traditional lithium-ion battery pole piece is as follows: firstly, the solvent, the conductive electrode, and the positive / negative active material are sequentially added to the...
Claims
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IPC IPC(8): F26B7/00H01M4/139
CPCY02E60/122Y02E60/10
Inventor 吴建华高锋柱
Owner 奇瑞新能源汽车股份有限公司