Battery
A battery includes a power-generating element having at least one unit cell including an electrode layer, a counter-electrode layer, and an electrolyte layer located between the electrode layer and the counter-electrode layer and an insulating member covering the power-generating element. The insulating member includes a first member that includes a first principal surface covering portion covering a first principal surface of the power-generating element and a second member, joined to the first member, that includes a second principal surface covering portion covering a second principal surface of the power-generating element opposite to the first principal surface. A junction between the first member and the second member overlaps a side surface of the power-generating element when seen from a direction perpendicular to the side surface. An elastic modulus of the first member is higher than an elastic modulus of the second member.
1 . A battery comprising:
a power-generating element having at least one unit cell including an electrode layer, a counter-electrode layer, and an electrolyte layer located between the electrode layer and the counter-electrode layer, wherein a first principal surface of the electrolyte layer contacts an opposing surface of the counter-electrode layer and a second principal surface of the electrolyte layer contacts an opposing surface of the electrode layer; and
an insulating member covering the power-generating element,
wherein
the insulating member includes
a first member that includes a first principal surface covering portion covering a first principal surface of the power-generating element, and
a second member, joined to the first member, that includes a second principal surface covering portion covering a second principal surface of the power-generating element opposite to the first principal surface,
a junction between the first member and the second member overlaps a side surface of the power-generating element when seen from a direction perpendicular to the side surface, wherein the first member and the second member include opposing surfaces that contact each other at the junction,
wherein both the first principal surface of the electrolyte layer and the second principal surface of the electrolyte layer are vertically offset from the junction when seen from the direction perpendicular to the side surface, and
an elastic modulus of the first member is higher than an elastic modulus of the second member.
2 . The battery according to claim 1 , wherein the first principal surface covering portion and the second principal surface covering portion are different in thickness from each other.
3 . The battery according to claim 1 , wherein a thickness of the first principal surface covering portion is greater than a thickness of the second principal surface covering portion.
4 . The battery according to claim 1 , wherein each of the first principal surface covering portion and the second principal surface covering portion has a thickness greater than or equal to 10 μm.
5 . The battery according to claim 1 , wherein the first member and the second member are in contact with the side surface.
6 . The battery according to claim 5 , wherein an area of contact between the second member and the side surface is larger than an area of contact of the first member and the side surface.
7 . The battery according to claim 1 , wherein at least one of the first member or the second member contains resin.
8 . The battery according to claim 7 , wherein the first member and the second member contain an identical type of resin.
9 . The battery according to claim 1 , wherein the side surface is a flat surface.
10 . The battery according to claim 1 , wherein the power-generating element has a plurality of the unit cells which are laminated.
11 . The battery according to claim 1 , wherein the electrolyte layer contains a solid electrolyte having lithium-ion conductivity.