Patent ID: 6444349
Filing Date: 2002-09-03
Classification: H01M,Y02E

Abstract:
A sealed nickel-metal hydride storage cell comprising at least one positive electrode whose electrochemically reactive material is a hydroxide containing principally nickel and at least one negative electrode whose electrochemically active material is an intermetallic compound capable of forming a hydride when charged, wherein the total quantity of electrochemically active material in said negative electrode exceeds the total quantity of electrochemically active material in said positive electrode so that the total negative capacity exceeds the total positive capacity by an amount of at least 15% referred to as the overcapacity, part of said overcapacity, referred to as the precharge, is in the charged state when said positive electrode is completely discharged and the remaining part, referred to as the surplus, is in the discharged state when said positive electrode is completely charged, and said precharge is less than 10% of said negative overcapacity.