Preparation method of lithium ion battery

Abstract

The invention discloses a preparation method of a lithium ion battery, which comprises the following steps: (1) preparing a positive plate, a negative plate and diaphragm paper; (2) preparing an electrical core by using the positive plate, the negative plate and the diaphragm paper: sequentially arranging the positive plate, the diaphragm paper and the negative plate between two layers of poly(ethylene terephthalate) resin films to be processed by thermal compounding to obtain a compound which comprises the positive plate, the diaphragm paper and the negative plate, making two or more than two compounds into single electrical cores, and connecting the single electrical cores in parallel or in series to form the electrical core; (3) arranging the electrical core into a shell, injecting electrolyte into the shell for formation treatment and capacitance dividing treatment, and then, obtaining the lithium ion battery. When the method is used for preparing the lithium ion battery, the irregular expansion of the lithium ion battery can be effectively controlled, thereby enabling the appearance of the lithium ion battery to be smooth and regular and being beneficial to the circulation times and the magnification discharge performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a lithium battery. Background technique [0002] Lithium-ion batteries are more and more widely used in people's daily life and national defense, and their production technology has been developing and advancing. Among them, the improvement of materials is the most, while the improvement of the preparation process of lithium-ion batteries is relatively small. Lithium ions are generally prepared according to the following method: firstly prepare the positive electrode sheet and the negative electrode sheet, then insert a separator between the positive electrode sheet and the negative electrode sheet, stack or wind up a single cell according to the order of the positive electrode sheet, separator, and negative electrode sheet, and then Pack the case, inject the electrolyte, seal it, turn it into activation, pack it in separate volumes and ship it. There is ...

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Problems solved by technology

[0003] Using the above methods to produce batteries, although the work efficiency is relatively high, it is difficult to permanently eliminate the irregular deformation of the battery as a whole; at the same time, due to the uneven force on the batteries and the inconsistent thermal conductivity during hot pressing, it may also cause damage to the batteries. Part of the battery produces fatal damage

In addition, in the above existing methods, the battery is generally hot-pressed and reshaped after the battery is injected. At this time, the pressure and temperature on the battery have a greater impact on the extrusion loss, thermal volatilization loss and variation of the electrolyte in the battery. Large impact, therefore, will have a certain impact on the overall performance of the battery

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