Sealed battery and manufacturing method of sealed battery

A manufacturing method of a sealed battery, the manufacturing method comprising:

• bringing a joint region formed in a peripheral portion defining a vent hole of a connection plate of the sealed battery into contact with a surface of a reversing portion of a shut-off valve of the sealed battery, the surface facing an inner side of a battery outer case in which an electrode body is accommodated;
• and
• forming a thermal-spray joint portion such that a metallic material is sprayed so as to cover a border between the joint region and the reversing portion, wherein:
• the sealed battery includes:
• a collector terminal electrically connected to the electrode body inside the battery outer case;
• an outwardly exposed terminal electrically connected to the collector terminal inside the battery outer case and partially exposed outside the battery outer case;
• and
• a current shut-off mechanism placed on a conductive path from the collector terminal to the outwardly exposed terminal and configured to cut off the conductive path when an internal pressure of the battery outer case exceeds a predetermined pressure;
• and
• the current shut-off mechanism includes the connection plate as a plate-shaped conductive member provided in one end of the collector terminal, the connection plate with the vent hole provided in a central part of the connection plate, and the shut-off valve including the reversing portion electrically connected to the outwardly exposed terminal.