Mechanism for dissociating battery cell winding needle and needle dissociating method for mechanism

Abstract

The invention belongs to the technical field of manufacturing of lithium-ion batteries, and particularly relates to a mechanism for dissociating a battery cell winding needle and a needle dissociating method for the mechanism. The mechanism comprises a first discharge clamp, a second discharge clamp, a finger-clamping connector, a finger-clamping cylinder, a fixed seat, a photoelectric control unit and a limiting control unit, wherein the second discharge clamp is arranged corresponding to the first discharge clamp; the fixed seat is arranged between the finger-clamping connector and the finger-clamping cylinder; the photoelectric control unit and the limiting control unit are arranged on the fixed seat; the first discharge clamp and the second discharge clamp are connected with the finger-clamping cylinder through the finger-clamping connector respectively; vacuum suction holes are formed in the first discharge clamp; vacuum suction nozzles are arranged on the second discharge clamp; and the vacuum suction holes are arranged corresponding to the vacuum suction nozzles. Compared with the prior art, the yield of a battery cell can be improved; the problem that an isolating film is scrapped due to cell dissociation can be reduced; and the condition that a winding machine further works after a needle dissociating failure of the winded cell is avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a mechanism and a needle-drawing method for pulling out a battery core winding needle. Background technique [0002] In the production process of lithium-ion batteries, there is a process of winding positive and negative electrodes and separators into winding cores. However, the winding mechanism in the existing automatic winding equipment mostly adopts a two-half needle winding structure. One half of the winding needles can move longitudinally forward and backward relative to the other half of the winding needles; one half is fixedly connected to the motor as the active winding needle, and the other half is used as the driven winding needle, which can move axially relative to the half connected to the motor, and it is completely possible Remove (take off), rotate and wind under the drive of the motor; there is a gap between the two halves of...

AI Technical Summary

Problems solved by technology

[0002] In the production process of lithium-ion batteries, there is a process of winding positive and negative electrodes and separators into winding cores. However, the winding mechanism in the existing automatic winding equipment mostly adopts a two-half needle winding structure. One half of the winding needles can move longitudinally forward and backward relative to the other half of the winding needles; one half is fixedly connected to the motor as the active winding needle, and the other half is used as the driven winding needle, which can move axially relative to the half connected to the motor, and it is completely possible Remove (take off), rotate and wind under the drive of the motor; there is a gap between the two halves of the winding needle, the diaphragm passes through the gap, and is wound together with the winding needle. The film and the diaphragm are wound together), and the winding needle is separated from the winding core; the separation film is tightly attached to and wrapped on the surface of the winding needle due to tension, and the material is thin and soft, and its thickness is usually in the order of microns , so the winding mechanism of this needle movement mode often causes the winding core to take out the isolation film of the first circle in the winding core together with the winding needle when the winding core is pulled away from the winding needle, so that the entire winding core cannot be separated from the winding needle normally. It will directly cause the winding core to be scrapped; even if it can be forcibly pulled away, it will easily cause damage to the inner layer of the separator, and it will also cause poor tightness of the separator in the center of the battery core, which will reduce the tightness of the entire winding core and make subsequent drying Quality problems such as winding core deformation occur during baking and other processes

In addition, if the winding core with abnormal needle extraction is not taken out in time, after turning over to the next station, the winding needle will damage the separator, positive electrode sheet and negative electrode sheet of the next winding core, resulting in material waste and reduced production efficiency loss and increased maintenance

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