Die-cutting lamination system and method

Abstract

The invention provides a die-cutting lamination system and method. The system comprises an unwinding mechanism, a pole roll cutting mechanism, preheating and rolling devices, detection devices, a diaphragm cutting mechanism and a laminating device. A negative pole cutting mechanism is matched with a negative pole unwinding mechanism and cuts a negative pole piece, and a positive pole cutting mechanism is matched with a positive pole unwinding mechanism and cuts a positive pole piece, so that a laminated layer in which the negative pole piece and the positive pole piece are alternately distributed on the upper side and the lower side of a diaphragm is obtained. The pre-heating rolling devices enable the positive pole piece and the negative pole piece of the laminated layer to be respectively adhered to the diaphragm. The detection device detects whether laminated sheets have defects or not. A first diaphragm cutting mechanism cuts and discharges defective laminated sheet units in pairs,and a second diaphragm cutting mechanism cuts diaphragms of the last qualified laminated sheet unit based on the number of laminated layers. The laminating device enables the positive pole laminatedsheet units and the negative pole laminated sheet units to be alternately laminated. The system is relatively simple in structure, high in lamination speed, low in failure rate, low in system diaphragm cutting frequency and low in risk of diaphragm wrinkles and outer leakage of the pole pieces.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a die-cut lamination system and method. Background technique [0002] In the environment of the automobile industry using traditional energy as power supply, the problem of environmental pollution has aroused people's attention to environmental protection and resource utilization. Actively developing new energy vehicles and realizing the electrification of the automobile industry is a strategic measure to achieve the goal of "overtaking on curves" in foreign automobile industries. Lithium-ion device technology is a key technology for the development of electric vehicles. The square lamination technology is one of the most advanced lithium-ion battery manufacturing technologies at present. Among them, the lamination speed directly determines the production capacity of the whole line and the manufacturing cost of the battery cell. [0003] At present, most of them use the z-typ...

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Problems solved by technology

[0003] At present, most of them use the z-type lamination process, but the world’s fastest lamination speed that has been mass-produced is 0.6s / piece. This lamination method is relatively slow, resulting in a large demand for equipment, a large footprint, and high purchase costs. , later maintenance cost and energy consumption are large

There are two main reasons for the slow lamination speed: one is that the laminations are loaded by magazines, and there will be double sheet suction during the feeding process. Therefore, the traditional lamination opportunities include blowing, brushing, shaking, double Devices such as sheet detection are used to prevent double-sheet suction. At present, no matter what method is used, the double-sheet problem cannot be completely eliminated, and these devices have greatly reduced the speed of manipulator feeding; second, the traditional lamination method is first. Stack the negative electrode, then wrap the diaphragm on the negative electrode, then stack the positive electrode, and then wrap the diaphragm on the positive electrode. The stacking unit of this stacking method is a single pole piece or a single diaphragm. Due to the limitation of the mechanical structure, the stacking speed cannot be realized. Substantial improvement

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