Patent ID: 7556884

Claim:
A battery pack, comprising: a battery cell with a positive electrode and a negative electrode; a circuit board having first and second electrode connecting portions; a battery pack casing in which the battery cell and the circuit board are housed; first and second electrode leads projecting from said battery cell and respectively electrically connected to the positive electrode and the negative electrode of the battery cell; and a thermostat having (a) a thermostat casing a portion of which is formed of a nonconductive material, and (b) first and second electrode portions each having oppositely facing exposed portions at upper and lower major surfaces of the thermostat casing, the first electrode exposed portion forming a first portion of the upper major surface of the thermostat casing, wherein, the first electrode lead is connected to the circuit board by the first electrode connecting portion, the second electrode lead is connected to the exposed portion of the first electrode portion of the thermostat, the exposed portion of the second electrode portion of the thermostat is connected to the second electrode connecting portion of the circuit board such that said thermostat is sandwiched between the second electrode lead and second electrode connecting portion of the circuit board, and the first electrode is partially embedded in the casing portion via a recessed portion therein.