Screening method for lithium ion battery pole piece water absorptivity
A technology for lithium-ion batteries and battery pole pieces, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as difficult pole pieces and changes in battery moisture, achieve significant production practice significance, improve market application prospects, and improve Effects on service life and safety
Active Publication Date: 2016-03-02
LISHEN (QINGDAO) NEW ENERGY CO LTD +1
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Problems solved by technology
[0004] At present, the traditional method is: take samples of the pole piece before drying and the pole piece after drying, and then conduct a test with a Karl Fischer moisture tester, which makes it difficult to judge the moisture content of the pole piece and battery during production and storage change
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[0060] First, take the pole pieces A, B, and C after drying in the same process, and record them as A-1, B-1, and C-1, and put them into the desiccator immediately. Take out the pole piece and start timing, take appropriate amount of samples with storage time of 0, 10, 30min, 60min, 120min and 180min, put them into sealed bags, and quickly put them into a glove box filled with argon atmosphere, take samples and pass the moisture tester Carry out a moisture test and measure the corresponding moisture respectively;
[0061] Secondly, take the electrode pieces A, B, and C dried by the same process, and record them as A-2, B-2, and C-2, and put them into the desiccator immediately. Next, take out the pole piece and start timing, take appropriate amount of samples for 0, 10min, 30min, 60min, 120min and 180min respectively, put them into a sealed bag, and quickly put them into a glove box filled with argon atmosphere, take samples and test their moisture content through a moisture t...
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The invention discloses a screening method for lithium ion battery pole piece water absorptivity. The method comprises the steps that a first battery pole piece sample with the preset water content is selected for any one kind of battery pole pieces to be placed in the preset first humidity environment, and the water content of the first battery pole piece sample placed for different preset periods of time is measured respectively; according to the maximum value and the minimum value of the water content of the first battery pole piece sample in the preset first humidity environment, a water content difference value between the maximum value and the minimum value of the water content of the first battery pole piece sample is obtained; the water content difference value is compared with a preset first water content change difference value, and according to the corresponding relation between the preset difference comparison results and the different water absorptivity levels of the first battery pole piece sample, the water absorptivity level of the first battery pole piece sample is judged, and the battery pole pieces are screened. By means of the method, the battery pole piece water absorptivity can be accurately detected, the high-water-absorptivity battery pole pieces which cannot be placed for a long time are screened out and prevented from being applied in battery production, the service life of a lithium ion battery pack is prolonged, and the safety of the lithium ion battery pack is improved.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a method for screening the water absorption of lithium-ion battery pole pieces. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, long cycle life, and no environmental pollution. As a secondary chemical power source that can convert electrical energy and chemical energy into each other, it is regarded as one of the popular candidate technologies for electric energy storage systems. . Since its birth, its application fields have been continuously expanded and developed rapidly. At present, it is not only widely used in mobile communication equipment and portable electronic equipment, but also widely used in large electric equipment such as electric tools, electric bicycles and electric vehicles. [0003] At present, lithium-ion batteries are a very typical non-aqueous secondary battery. The water absorption...
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Login to View More IPC IPC(8): H01M4/139
CPCH01M4/139Y02E60/10
Inventor 秦杏聂磊张娜
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD