SAFETY VALVE, BATTERY CASE, AND SAFETY VALVE FORMATION METHOD

Provided are: a safety valve which can be easily manufactured without the need for high-precision facilities and manufacturing techniques; a battery case provided with said safety valve; and a method for forming said safety valve. A safety valve is formed in a battery case so as to be partially thin...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	OSAFUNE, Tatsuya
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:	Provided are: a safety valve which can be easily manufactured without the need for high-precision facilities and manufacturing techniques; a battery case provided with said safety valve; and a method for forming said safety valve. A safety valve is formed in a battery case so as to be partially thin-walled. The safety valve comprises: a flat section; and a groove that is formed on the peripheral edge of the flat section and that is recessed toward the inside of the battery case. When the internal pressure within the battery case reaches or exceeds a predetermined explosion-prevention pressure, the recessed shape of the groove becomes inverted so that the groove protrudes toward the outside of the battery case and a crack is formed, causing the groove to open.