Molding of secondary battery and method for moulding secondary battery

Abstract

A mold for a battery, such as a secondary battery, and a method of molding a battery, such as a secondary battery, using the mold, uses a minimum amount of a molding substance, such as a resin, has its molding time shortened, and has a safety vent of a can being prevented from being fractured by high pressure during a molding process. Runners, through which a resin flows, are arranged parallel to cavities and the safety vent of the can is positioned closest to the gates, into which a resin is injected after the can and a protective circuit board are seated in the cavities. Due to the structure of the runners of the mold and the location of the safety vent of the can, the amount of resin used and the molding time are reduced. A fracture of the safety vent is avoided since a lower pressure occurs at the location closest to the gates during a resin filling process.

Description

technical field [0001] The present invention relates to the molding of batteries, and more particularly, the present invention relates to molds for batteries and methods of molding batteries, such as secondary batteries, using the molds, wherein a minimum amount of molding substance, such as resin, is used to Holding a board, such as a protective circuit board, on the battery allows short molding time using resin and prevents the safety hole of the battery case from breaking due to high pressure during molding. Background technique [0002] As is well known in the art, in order to avoid battery overcharge, overdischarge, overcurrent, short circuit due to external loads, etc., secondary batteries, especially prismatic lithium-ion secondary batteries, are electrically connected to a protective circuit board to the case (battery housing) positive and negative terminals. The case has a safety hole formed on the cathode terminal side, the safety hole having a thinner wall thickn...

AI Technical Summary

Problems solved by technology

This leads to poor molding of secondary batteries

[0007] The conventional resin molding method also has the problem that since the safety hole of the case is located away from the inlet where the resin is injected, the safety hole is easily broken due to the filling pressure of the resin

This is because the farther you are from the inlet where the resin flows in, the higher the air pressure becomes due to resin filling, and a safety hole that has a thinner wall thickness than the rest of the case may burst toward the inside of the case due to this high pressure

[0008] If the safety hole is broken in this way, a second problem may arise, that is, the high-voltage resin may seep into the case, and the electrolyte may easily flow along the interface between the case and the resin during battery use. leaked outside

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