Battery cell diaphragm drawstring buffering device and technology thereof

Abstract

The invention discloses a battery cell diaphragm pulling belt temporary storage device and a technology thereof. The device comprises a pulling belt assembly, a diaphragm temporary storage assembly and a pressing belt assembly which are arranged on a supporting plate, the belt pulling assembly comprises two pulling rollers which are arranged at intervals, the two pulling rollers are connected to the two ends of a connecting plate respectively, a diaphragm sequentially passes through the two pulling rollers and is tensioned by the pulling rollers, and the connecting plate drives the two pulling rollers to rotate so as to pull or release a belt; the diaphragm cache assembly is arranged at the rear section of the drawstring assembly, and the diaphragm cache assembly tensions the diaphragm and linearly moves back and forth to store or release the diaphragm; the belt pressing assembly is arranged on the rear section of the diaphragm cache assembly, the diaphragm enters the belt pressing assembly after being guided out of the diaphragm cache assembly, the belt pressing assembly presses or loosens the diaphragm, and the situation that the diaphragm on the rear section is pulled back when the belt pulling assembly pulls the belt or the diaphragm cache assembly caches the diaphragm is avoided. According to the diaphragm feeding device, automatic buffering of diaphragms between feeding and diaphragm drawing is achieved, the diaphragms are made to be in the same tension state continuously, and the surface quality of a film is greatly improved.

Description

technical field [0001] The invention relates to the field of automation equipment, in particular to a cell diaphragm drawstring buffering device and a process thereof. Background technique [0002] Lithium battery refers to batteries containing lithium in the electrochemical system, including metal lithium, lithium alloys, lithium ions, and lithium polymers. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium battery is a rechargeable battery that mainly relies on lithium ions to move between positive and negative electrodes to work. During charging and discharging, lithium ions intercalate and deintercalate back and forth between the two electrodes: when charging the battery, lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. A battery that ...

AI Technical Summary

Problems solved by technology

During the diaphragm coating process, due to the change of its internal tension, the surface quality of the diaphragm after coating will not meet the requirements of the cell manufacturing process.

The main factor affecting the tension of the diaphragm is that in the prior art, the laminating device directly pulls the diaphragm from the material roll, and the material roll rotates to release the diaphragm. Keep completely consistent in real time and continuously; if the feeding speed of the material roll is too fast, the diaphragm belt between the material roll and the laminating device is in a loose state, and the flexible diaphragm belt is prone to surface wrinkles or warping; If the film pulling speed of the membrane device is greater than the unwinding speed of the roll, the diaphragm will be over-tensioned and stretched, resulting in uneven material distribution inside the flexible diaphragm

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