Rectangular secondary battery

1. A rectangular secondary battery, comprising:

a rectangular casing that has an opening;

a sealing plate that seals the opening;

an electrode body that is disposed in the rectangular casing and that includes at least one positive electrode plate and at least one negative electrode plate;

a plurality of tabs that are connected to the at least one positive electrode plate or the at least one negative electrode plate;

a current collector that is connected to the plurality of tabs; and

a terminal that is electrically connected to the current collector and that protrudes from the sealing plate toward an outside of the battery,

wherein a first tab group that is composed of a plurality of the plurality of tabs and a second tab group that is composed of a plurality of the plurality of tabs are connected to the electrode body,

wherein the first tab group and the second tab group are disposed between the sealing plate and the electrode body,

wherein the first tab group and the second tab group are disposed so as to be displaced from each other in a longitudinal direction of the sealing plate, and

wherein the first tab group and the second tab group are connected to different positions on the current collector.

2. The rectangular secondary battery according to claim 1 ,

wherein the electrode body includes a first electrode body element and a second electrode body element,

wherein the first tab group is connected to the first electrode body element, and

wherein the second tab group is connected to the second electrode body element.

3. The rectangular secondary battery according to claim 2 ,

wherein the first electrode body element and the second electrode body element are each a rolled electrode body element in which the at least one positive electrode plate having a strip-like shape and the at least one negative electrode plate having strip-like shape are rolled up with a separator having a strip-like shape therebetween.

4. The rectangular secondary battery according to claim 3 ,

wherein the plurality of tabs include a plurality of negative electrode tabs that is connected to the at least one negative electrode plate, and

wherein, in the first electrode body element, the number of the plurality of negative electrode tabs that are stacked and included in the first tab group is less than the number of layers of the at least one negative electrode plate that are stacked in a thickness direction of the first electrode body element.

5. The rectangular secondary battery according to claim 3 ,

wherein the electrode body further includes a third electrode body element that is a rolled electrode body element to which a third tab group is connected and a fourth electrode body element that is a rolled electrode body element to which a fourth tab group is connected,

wherein the third tab group is superposed on the first tab group and connected to the current collector, and

wherein the fourth tab group is superposed on the second tab group and connected to the current collector.

6. The rectangular secondary battery according to claim 1 ,

wherein a fuse portion is formed between a portion of the current collector connected to the terminal and a portion of the current collector connected to the first tab group, and a fuse portion is formed between the portion of the current collector connected to terminal and a portion of the current collector connected to the second tab group.

7. The rectangular secondary battery according to claim 1 ,

wherein the terminal includes a flange portion and an insertion portion disposed on the flange portion,

wherein the flange portion is disposed nearer than the sealing plate to the electrode body,

wherein the insertion portion extends through a terminal attachment hole in the sealing plate and is upset at a position further outward from the sealing plate with respect to the battery, and

wherein the current collector is connected to a surface of the flange portion facing the electrode body.

8. The rectangular secondary battery according to claim 1 ,

wherein the current collector includes a base portion and a tab connection portion that is folded from an end of the base portion, and

wherein the base portion and the terminal are connected to each other, and the tab connection portion and the tab are connected to each other.