| 摘要 |
PROBLEM TO BE SOLVED: To provide a protection device which is used mainly for a battery cell unit in various types of electronic devices and which can reliably protect an electronic circuit with a simple arrangement. SOLUTION: A heat conductive pattern 10 is provided on the upper surface of a wiring circuit board 1 to extend from the lower surface of a switching element 2 to the inner edge of a through hole 8, a heat conductive resin 9 is coated and formed between the outer periphery of a temperature fuse 5 and the switching element 2, so that heat generated by the switching element 2 can be reliably transmitted to the temperature fuse 5 with less variations, not only from the heat conductive resin 9 but also from the heat conductive pattern 10 having a good thermal conductivity. Consequently, the protection device capable of reliably protecting an electronic circuit can be obtained with a simple arrangement. COPYRIGHT: (C)2009,JPO&INPIT
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