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1. (WO2018159068) BATTERY UNIT

Pub. No.:    WO/2018/159068    International Application No.:    PCT/JP2017/045004
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Fri Dec 15 00:59:59 CET 2017
IPC: H02J 7/00
H02H 7/18
Applicants: CAR MATE MFG.CO.,LTD.
Inventors: AKIBA Mikihiko
秋葉 幹彦
川向 敏博
[Problem] To provide a battery unit with which it is possible, when a fault occurs in a secondary cell, to safely alert a user of the occurrence of the fault using a structure that does not involve the use of an electrical signal such as a sensor. [Solution] A battery unit 10 that can be detachably attached to a charger 40 in order to establish an electrical connection, wherein the battery unit 10 is characterized in having a secondary cell 12, a casing 14 which covers the secondary cell 12 and which is provided with an external terminal 18 electrically connected to the secondary cell 12, and a secondary cell holder 16 that holds the secondary cell 12 in the casing 14, the casing 14 being provided with an indicator pin 26 which, when a fault occurs in the secondary cell 12, projects to the exterior of the casing 14 due to the expansion of the secondary cell 12 and prevents an electrical connection from being established by the external terminal 18 .