Core needle and core pack inner hole expanding mechanism

Abstract

The present invention discloses a core needle and a core pack inner hole expanding mechanism. The core needle is arranged in a hollow mode; the core pack inner hole expanding mechanism comprises a heating element comprising a core needle mentioned above, the heating element heats the core needle; the core needle is arranged in a hollow mode so that the core needle is easier to be heated and is uniformly heated to ensure the uniformity and the consistency of the core pack forming; the top portion of the core needle is provided with a small hole to exhaust hot wind out of the core needle to further make the core needle uniform heated; the top portion of the core needle is subjected to eccentric taper-shaped arrangement which is not easy to damage a separator in a jacking mode so as to ensurethe processing quality of the battery cell; the heating fins of the heating element are adopted to heat the core needle, the core needle is configured to perform thermal expanding of the hole for thecenter hole of the battery cell, the separator of the battery cell after the inner hole expanding is not easy to deform and rebound to ensure automatic welding in the shell in the later production, and the separator of the center hole cannot be damaged to cause short circuit; and moreover, the heating element is compact in structure, an air blow pipe is adopted with heating so that the core needle is quickly heated and uniformly heated, and the thermal efficiency is high.

Description

technical field [0001] The invention relates to the technical field of battery cell processing equipment, more specifically, to a core needle and a core bag inner hole expansion mechanism including the core needle. Background technique [0002] An existing battery manufacturing method is to wind positive and negative electrode sheets, separators and positive and negative tabs to form a battery core by using a reel of a winding machine. After the core winding is completed, the center hole needs to be expanded into a round hole through the inner hole expansion mechanism of the core package. When the existing manufacturers ream the battery core, the center hole is cold reamed, and most of them use the needle rolling circular extrusion expansion method to ream the hole. After this method is reamed, the diaphragm next to the center hole of the battery core is easy to Rebound, in the subsequent production, it cannot be automatically welded into the shell, which may easily cause d...

AI Technical Summary

Problems solved by technology

When the existing manufacturers ream the battery core, the center hole is cold reamed, and most of them use the needle rolling circular extrusion expansion method to ream the hole. After this method is reamed, the diaphragm next to the center hole of the battery core is easy to Rebound, in the subsequent production, it cannot be automatically welded into the shell, which may easily cause damage to the center hole of the battery core and cause a short circuit

In foreign countries, there is also a method of thermally expanding the hole by rotating the needle at a high speed. However, the needle in this method is not heated uniformly, and the heating time is long, which may easily cause damage to the diaphragm of the center hole.

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