Lithium ion battery high-speed laminating method, laminating device and lithium ion battery

Abstract

The invention relates to the technical field of battery manufacturing, and specifically discloses a lithium ion battery high-speed laminating method, a laminating device and a lithium ion battery. Thelithium ion battery high-speed laminating method comprises the following steps: step S100, providing pole pieces after die cutting and a laminating platform so that one end of each of diaphragms on adiaphragm roll positioned above the laminating platform is fixed onto the laminating platform; step S200, stacking the diaphragms onto the laminating platform in a Z-shaped form, wherein at leas twopole pieces with same polarity are placed at intervals above the diaphragms when the diaphragms are overlapped on every layer, the polarities of every two adjacent layers of pole pieces are different,and a battery cell green body assembly is formed after N layers of diaphragms are stacked; and step S300, enabling a cutting device to cut the battery cell green body assembly at the positions between the adjacent pole pieces so as to form single battery cell green bodies. At least two pole pieces are stacked on each layer, the action of repeatedly capturing the pole pieces can be reduced, the positioning time is reduced, the stacking of at least two battery cell green bodies is completed once, and the laminating speed is increased.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a high-speed stacking method for a lithium-ion battery, a stacking device and a lithium-ion battery. 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 cer...

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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