| 摘要 |
PROBLEM TO BE SOLVED: To prevent a lithium primary battery from lowering its storage property when heated up to a high temperature region required for reflow soldering. SOLUTION: A negative electrode 2 of the lithium primary battery is formed of an alloy containing mainly Li and Al and the content of Li in the alloy is in a range of 60-75% at an atomic ratio. If the content of Li is 75 atom.% or less, Li in the alloy is free from melting in short-time high-temperature heating during soldering or the like and there are no possibility of dropping the open circuit voltage of the battery after stored or decreasing the discharge capacity, as usual. On the other hand, if the content of Li is 60 atom.% or less, the discharge capacity is decreased because of a shortage of Li. Therefore, the above range should be kept. There is no possibility of lowering the storage property even in high-temperature heating, permitting the use of an automatic device such as a reflow soldering device and improving productivity.
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