Secondary battery and method for manufacturing the same

A secondary battery comprising:

• an electrode assembly including a positive electrode plate and a negative electrode plate;
• an exterior body having an opening and containing the electrode assembly;
• a sealing plate that seals the opening;
• a conductive member having an opening portion at a side facing the electrode assembly and disposed near a side of the sealing plate facing the electrode assembly;
• a deformation plate that seals the opening portion and that is deformed in response to an increase in a pressure in the exterior body;
• a current collecting member that electrically connects the positive electrode plate or the negative electrode plate to the deformation plate;
• an insulating member disposed between the deformation plate and the current collecting member;
• and
• a terminal that is electrically connected to the positive electrode plate or the negative electrode plate via the current collecting member, the deformation plate, and the conductive member,
• wherein the insulating member includes a plurality of fixing projections and a displacement prevention projection on a surface thereof that faces the electrode assembly,
• wherein the current collecting member has a plurality of fixing holes and a displacement prevention hole,
• wherein the insulating member and the current collecting member are fixed to each other such that the plurality of fixing projections is disposed in the plurality of fixing holes and has large-diameter portions formed at respective ends of the plurality of fixing projections,
• wherein the displacement prevention projection is disposed in the displacement prevention hole,
• wherein a conductive path between the positive electrode plate and the terminal or between the negative electrode plate and the terminal is broken in response to a deformation of the deformation plate,
• wherein the plurality of fixing projections has a pair of fixing projections which are adjacent to each other,
• wherein the plurality of fixing holes has a pair of fixing holes which are adjacent to each other,
• wherein the displacement prevention projection is located between the pair of fixing projections,
• wherein the displacement prevention hole is located between the pair of fixing holes, and
• wherein an outer dimension of a distal end of the displacement prevention projection is smaller than an inner dimension of the displacement prevention hole in a direction perpendicular to a thickness direction of the sealing plate, wherein the inner dimension of the displacement prevention hole is measured on a first surface opposed to a second surface of the current collecting member, the second surface facing to the electrode assembly in the thickness direction of the sealing plate.

A secondary battery comprising:

• an electrode assembly including a positive electrode plate and a negative electrode plate;
• an exterior body having an opening and containing the electrode assembly;
• a sealing plate that seals the opening;
• a conductive member having an opening portion at a side facing the electrode assembly and disposed near a side of the sealing plate facing the electrode assembly;
• a deformation plate that seals the opening portion and that is deformed in response to an increase in a pressure in the exterior body;
• a current collecting member that electrically connects the positive electrode plate or the negative electrode plate to the deformation plate;
• an insulating member disposed between the deformation plate and the current collecting member;
• and
• a terminal that is electrically connected to the positive electrode plate or the negative electrode plate via the current collecting member, the deformation plate, and the conductive member,
• wherein the insulating member includes a fixing projection and a plurality of displacement prevention projections on a surface thereof that faces the electrode assembly,
• wherein the current collecting member has a fixing hole and a plurality of displacement prevention holes,
• wherein the insulating member and the current collecting member are fixed to each other such that the fixing projection is disposed in the fixing hole and has a large-diameter portion formed at an end of the fixing projection,
• wherein the plurality of displacement prevention projections is disposed in the plurality of displacement prevention holes,
• wherein a conductive path between the positive electrode plate and the terminal or between the negative electrode plate and the terminal is broken in response to a deformation of the deformation plate,
• wherein the plurality of displacement prevention projections has a pair of displacement prevention projections which are adjacent to each other,
• wherein the plurality of displacement prevention holes has a pair of displacement prevention holes which are adjacent to each other,
• wherein the fixing projection is located between the pair of displacement prevention projections,
• wherein the fixing hole is located between the pair of displacement prevention holes, and
• wherein an outer dimension of a distal end of each of the pair of displacement prevention projections is smaller than an inner dimension of a corresponding one of the pair of displacement prevention holes in a direction perpendicular to a thickness direction of the sealing plate, wherein the inner dimension of the corresponding one of the pair of displacement prevention holes is measured on a first surface opposed to a second surface of the current collecting member, the second surface facing to the electrode assembly in the thickness direction of the sealing plate.