Stacked secondary battery
A stacked secondary battery includes battery element including a multilayer structure formed by laying alternately flat plate-shaped positive electrodes and flat plate-shaped negative electrodes by way of separators, the number of the positive electrodes being larger by one than that of the negative electrodes or vice versa, and connecting positive electrode draw-out terminals of the positive electrodes to each other and also negative electrode draw-out terminals of the negative electrodes to each other, plate-shaped metal members respectively arranged on and held in contact with the opposite end surfaces of the multilayer structure as viewed in the stacking direction, binding members binding the plate-shaped metal members so as to pinch and hold the multilayer structure from the end surfaces thereof and a film casing containing the battery element pinched by and held between the plate-shaped metal members in a sealed condition.
1. A stacked secondary battery comprising:
battery element including a multilayer structure formed by laying alternately flat plate-shaped positive electrodes including collectors and flat plate-shaped negative electrodes including collectors by way of separators, the number of the positive electrodes being larger by one than that of the negative electrodes or vice versa, and connecting positive electrode draw-out terminals of the positive electrodes to each other and also negative electrode draw-out terminals of the negative electrodes to each other;
plate-shaped metal members comprising a flat plate portion and a rib member formed on a back side of the flat plate portion, the plate-shaped metal members being respectively arranged on and held in contact with the opposite end surfaces of the multilayer structure as viewed in the stacking direction, plate-shaped metal members being respectively held in direct contact with and electrically connected to, in stacking direction, both end surfaces of the multilayer structure, the both end surfaces having the same polarity, and the plate-shaped metal members being formed of the same material as that of the collectors of the electrodes positioned outermost of the multilayer structure;
binding members binding the plate-shaped metal members so as to pinch and hold the multilayer structure from the end surfaces thereof; and
a film casing containing the battery element pinched by and held between the plate-shaped metal members in a sealed condition.
2. The secondary battery according to claim 1 , wherein the positive electrodes or the negative electrodes arranged at the respective opposite end surfaces of the multilayer structure of said battery element do not have any active substance layer formed on the surfaces thereof that are held in contact with the respective plate-shaped metal members.
3. The stacked secondary battery according to claim 1 , wherein the layered electrodes of a polarity whose number being smaller than that of the layered electrodes of the opposite polarity are contained respectively in the inside of pouch-shaped separators.
4. The stacked secondary battery according to claim 2 , wherein the layered electrodes of a polarity whose number being smaller than that of the layered electrodes of the opposite polarity are contained respectively in the inside of pouch-shaped separators.
5. The stacked secondary battery according to claim 1 , wherein the plate-shaped metal members are made of copper or aluminum.
6. The stacked secondary battery according to claim 2 , wherein the plate-shaped metal members are made of copper or aluminum.