High speed laminating device and laminating method of lithium ion battery

Abstract

The invention relates to the technical field of battery manufacturing, and particularly discloses a high speed laminating device and laminating method of a lithium ion battery. The high speed laminating device of the lithium ion battery comprises multiple support plate bars arranged at intervals along a vertical direction; the adjacent support plate bars are connected via elastic pieces; the support plate bars are provided with installation side faces perpendicular to the horizontal plane; two transmission shafts on which a membrane of the lithium ion battery is wound is installed on each installation side face, and the two transmission shafts are arranged at interval along the horizontal direction; the transmission shafts are cylindrical in shape; and a space for holding the pole piece ofthe lithium ion battery is formed between each two adjacent transmission shafts along the vertical direction. The high speed laminating device of the lithium ion battery provided by the invention issimple in structure, convenient to operate, high in laminating efficiency and good in shaping quality.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a high-speed stacking device and a stacking method for lithium-ion batteries. Background technique [0002] At present, lithium-ion batteries are widely used in consumer electronics products, new energy vehicles, and energy storage fields. With the rapid development of the application market and the continuous improvement of user requirements for products, how to produce lithium-ion batteries with good safety performance, high specific energy, and cycle life Long, low-cost lithium-ion batteries have become an important research direction in the field of lithium-ion batteries. [0003] Lithium-ion batteries can be divided into two types according to their production methods: wound type and laminated type. The processing speed of the wound battery is fast and the efficiency is high, but it has the following defects: 1. The wound battery has certain requirements on th...

AI Technical Summary

Problems solved by technology

The processing speed of the wound battery is fast and the efficiency is high, but it has the following defects: 1. The wound battery has certain requirements on the flexibility of the pole piece, resulting in a low surface density of the pole piece, and the energy density of the single battery is restricted; 2. 1. The reaction of the winding battery at the bend of the pole piece is different from other positions, and the uniformity of the electrode reaction is poor, which affects the performance and even poses a safety hazard; 3. In order to make the negative electrode completely wrap the positive electrode of the winding battery, there is a part of the negative electrode ineffective area. Provides no capacity, reducing the energy density of the battery

[0005] 1. Z-shaped lamination, the pre-cut positive and negative electrodes and diaphragms are stacked one by one from bottom to top. This process is simple, but there are problems of slow lamination speed and low efficiency, which prolongs production. cycle, which increases production costs;

[0006] 2. Bag-type lamination, the positive and negative electrodes that have been die-cut in advance are packaged in diaphragm bags respectively, and then stacked alternately to form a stack, but the process is complicated, and diaphragm bags need to be made, and the production efficiency is low;

[0007] 3. H-type lamination, this process is similar to Z-type lamination, except that the positive and negative poles have tabs on both sides or the positive and negative poles have two tabs on the telecommunications side, this process can effectively solve the problem of stacking Too many layers cause the problem that the tab welding area is too thick, but the stacking speed is still low

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