Preparation method of pole group of high-capacity lithium-ion power battery
A technology of power battery and manufacturing method, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as battery performance degradation, diaphragm folds, diaphragm and pole piece dislocation, etc., to improve stability and safety. sexual effect
Inactive Publication Date: 2015-05-20
TIANJIN LISHEN BATTERY
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Problems solved by technology
[0003] The purpose of the present invention is to solve the above-mentioned technical problems and provide a method for manufacturing a large-capacity lithium-ion power battery pole group, which can overcome the battery damage caused by vibration, bumps and long-term use of the existing large-capacity laminated batteries during use. The misalignment of the internal diaphragm and the pole piece, and the folding of the diaphragm will cause problems such as performance degradation or safety of the battery, which can effectively improve the stability and safety of the battery
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[0021] Below, the substantive features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed examples.
[0022] A method for manufacturing a large-capacity lithium-ion power battery pole group according to the present invention includes the steps of making pole pieces, and the pole pieces are made using the following steps:
[0023] After the battery electrode sheet is coated, rolled, and cut into strips, the positive and negative electrode sheets that have been cut into strips are punched out according to the preset size, and then corona is carried out with the diaphragm respectively. Heat sealing to form different pole piece-diaphragm composites, and then use the different pole piece-diaphragm composites to make laminated pole groups or wound pole groups.
[0024] The die-cut size of the pole pieces cut into strips should be adapted to the size of the battery-level group, and the...
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The invention provides a preparation method of a pole group of a high-capacity lithium-ion power battery. The preparation method comprises the step of manufacturing a pole piece, wherein the pole piece is produced by the following steps: coating the pole piece of the battery, grinding, slitting into strips, punching the positive pole piece and the negative pole piece of the slit strip according to the preset sizes respectively, carrying out corona heat sealing with diaphragms respectively to form different pole piece-diaphragm composite bodies, and then manufacturing the laminated pole group or the winding type pole group by use of different pole piece-diaphragm composite bodies. According to the prepared high-capacity lithium-ion power battery, the problems that the diaphragm and the pole piece inside the battery are dislocated, the diaphragm is folded, the performance and the safety of the battery are reduced due to vibration, bumping and long-term use of the high-capacity laminated battery are solved, and the stability and the safety of the battery are effectively improved.
Description
technical field [0001] The invention specifically relates to a method for manufacturing a large-capacity lithium-ion power battery pole group. Background technique [0002] Lithium-ion power batteries are mainly used in energy storage, electric vehicles, electric forklifts, etc., and are divided into power type and energy type. As an energy type lithium-ion power battery, the battery has large volume, heavy weight, high capacity, and high energy density. The security and stability of the system have very high requirements. For large-capacity power batteries, the size of the electrodes is relatively large, and the pole pieces and the diaphragm are prone to misalignment, wrinkles, dead zones or lithium precipitation, which have a greater impact on the stability and safety of the battery. Large-sized electrodes are also difficult. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned technical problems and provide a method f...
Claims
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Login to View More IPC IPC(8): H01M10/058H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 刘萍张俊英
Owner TIANJIN LISHEN BATTERY