Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprising:

• a prismatic outer can having an opening;
• an electrode assembly housed in the outer can and including a positive electrode and a negative electrode;
• a sealing plate sealing the opening;
• a current collecting tab electrically connected to either the positive electrode or the negative electrode;
• an external electrode terminal projecting outside the sealing plate;
• a diaphragm disposed at a position of the battery, the position being inner than the sealing plate and outer than the current collecting tab, the diaphragm being electrically connected to the external electrode terminal and the current collecting tab;
• a lead for electrically connecting the external electrode terminal and the diaphragm;
• a first insulating member interposed between the sealing plate and the lead;
• and
• a second insulating member interposed between the diaphragm and the current collecting tab,
• wherein
• the second insulating member has a throughhole, and a electric conduction path between the external electrode terminal and the electrode assembly passes through the throughhole;
• the first insulating member includes a pair of first side walls extending toward an inside of the battery from a body of the first insulating member;
• the second insulating member includes a pair of second side walls extending toward an outside of the battery from a body of the second insulating member;
• the first side walls and the second side walls are coupled to each other;
• and
• the diaphragm deforms toward the outside of the battery in accordance with an increase in a gas pressure in the battery, thereby breaking an electric connection between the external electrode terminal and the electrode assembly.