Rectangular secondary battery and method of making the same

A method of making a rectangular secondary battery including

• a rectangular housing that has an opening;
• a sealing plate that has a through-hole and that seals the opening;
• an electrode body that includes a positive electrode plate and a negative electrode plate and that is disposed in the rectangular housing;
• a terminal that is electrically connected to the positive electrode plate or the negative electrode plate and that is inserted into the through-hole of the sealing plate;
• an electroconductive member that is disposed between the sealing plate and the electrode body, that is electrically connected to the terminal, and that has an opening portion at an end thereof on the electrode body side;
• a inversion plate that seals the opening portion;
• a current collector that is electrically connected to the positive electrode plate or the negative electrode plate and that is connected to the inversion plate;
• and
• a first insulating member that is disposed between the inversion plate and the current collector,
• wherein the first insulating member has a through-hole,
• wherein the inversion plate and the current collector are connected to each other through the through-hole of the first insulating member,
• wherein the first insulating member and the current collector are fixed to each other,
• wherein the electroconductive member has a first outer side surface and a second outer side surface that face away from each other, and
• wherein the first insulating member includes a first pressing portion that is located outside of the first outer side surface and that presses the first outer side surface toward the second outer side surface and a second pressing portion that is located outside of the second outer side surface and that presses the second outer side surface toward the first outer side surface,
• wherein, the first insulating member includes:
• a body;
• and
• a first side wall and a second side wall that protrude from the body toward the sealing plate;
• the first side wall includes the first pressing portion;
• the second side wall includes the second pressing portion;
• and
• the body of the first insulating member is disposed between the inversion plate and the current collector,
• wherein, when the pressure inside the rectangular housing reaches a predetermined value or higher, the inversion plate deforms and an electrical connection between the positive electrode plate or the negative electrode plate and the terminal is cut due to deformation of the inversion plate,
• the method comprising:
• a step of attaching the first insulating member to the electroconductive member,
• wherein, in a state before the first insulating member is attached to the electroconductive member, a distance between a part of the first insulating member to become the first pressing portion and a part of the first insulating member to become the second pressing portion is smaller than a distance between a part of the electroconductive member to be pressed by the first pressing portion and a part of the electroconductive member to be pressed by the second pressing portion.

A method of making a rectangular secondary battery including

• a rectangular housing that has an opening;
• a sealing plate that has a through-hole and that seals the opening;
• an electrode body that includes a positive electrode plate and a negative electrode plate and that is disposed in the rectangular housing;
• a terminal that is electrically connected to the positive electrode plate or the negative electrode plate and that is inserted into the through-hole of the sealing plate;
• an electroconductive member that is disposed between the sealing plate and the electrode body, that is electrically connected to the terminal, and that has an opening portion at an end thereof on the electrode body side;
• a inversion plate that seals the opening portion;
• a current collector that is electrically connected to the positive electrode plate or the negative electrode plate and that is connected to the inversion plate;
• and
• a first insulating member that is disposed between the inversion plate and the current collector,
• wherein the first insulating member has a through-hole,
• wherein the inversion plate and the current collector are connected to each other through the through-hole of the first insulating member,
• wherein the first insulating member and the current collector are fixed to each other,
• wherein the electroconductive member has a first outer side surface and a second outer side surface that face away from each other, and
• wherein the first insulating member includes a first pressing portion that is located outside of the first outer side surface and that presses the first outer side surface toward the second outer side surface and a second pressing portion that is located outside of the second outer side surface and that presses the second outer side surface toward the first outer side surface,
• wherein, when the pressure inside the rectangular housing reaches a predetermined value or higher, the inversion plate deforms and an electrical connection between the positive electrode plate or the negative electrode plate and the terminal is cut due to deformation of the inversion plate,
• the method comprising:
• a step of attaching the first insulating member to the electroconductive member,
• a step of sealing the opening portion of the electroconductive member with the inversion plate,
• wherein a flange portion is provided at the end of the electroconductive member at which the opening portion is disposed,
• wherein the step of attaching the first insulating member to the electroconductive member causes the first pressing portion and the second pressing portion to press an outer surface of the flange portion,
• wherein, in a state before the first insulating member is attached to the electroconductive member, a distance between a part of the first insulating member to become the first pressing portion and a part of the first insulating member to become the second pressing portion is smaller than a distance between a part of the electroconductive member to be pressed by the first pressing portion and a part of the electroconductive member to be pressed by the second pressing portion.