Rectangular electricity storage device
View Patent ↗There is provided a prismatic power storage device having a reduced weight and ensuring a space for an electrode body that expands during charging, while the rigidity of an insulating sheet is ensured. A prismatic power storage device according to an aspect of the present disclosure includes: an electrode body ( 11 ) including a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate; an insulating holder ( 30 ) formed by shaping an insulating sheet ( 31 ) into a box shape and accommodating the electrode body ( 11 ); a prismatic outer case having an opening and accommodating the electrode body ( 11 ) and the insulating holder ( 30 ); and a sealing body sealing the opening of the outer case. The insulating sheet ( 31 ) includes a porous body.
1. A prismatic power storage device comprising:
an electrode body including a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate;
an insulating holder formed by shaping an insulating sheet into a box shape and accommodating the electrode body;
a prismatic outer case having an opening and accommodating the electrode body and the insulating holder; and
a sealing body sealing the opening of the outer case, wherein
the insulating sheet includes a porous body, wherein
the insulating sheet has a multilayer structure including the porous body, and wherein
at least one of surface layers of the insulating sheet having the multilayer structure is a non-porous body.
2. The prismatic power storage device according to claim 1 , wherein
the porous body is a synthetic paper mainly containing resin.
3. The prismatic power storage device according to claim 1 , wherein
the porous body is a sheet containing a foamable resin.
4. A prismatic power storage device comprising:
an electrode body including a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate;
an insulating holder formed by shaping an insulating sheet into a box shape and accommodating the electrode body;
a prismatic outer case having an opening and accommodating the electrode body and the insulating holder; and
a sealing body sealing the opening of the outer case, wherein
the insulating sheet includes a porous body, wherein
the insulating sheet has a multilayer structure including the porous body, and wherein,
in the insulating sheet having the multilayer structure, a porosity of a surface layer is lower than a porosity of an inner portion.
5. The prismatic power storage device according to claim 1 , wherein
the porous body has a porosity within a range of 5% to 50%.
6. The prismatic power storage device according to claim 1 , wherein
the insulating sheet has a thickness within a range of 100 μm to 300 μm.
7. The prismatic power storage device according to claim 4 , wherein
the porous body is a synthetic paper mainly containing resin.
8. The prismatic power storage device according to claim 4 , wherein
the porous body is a sheet containing a foamable resin.
9. The prismatic power storage device according to claim 6 , wherein
the porous body has a porosity within a range of 5% to 50%.
10. The prismatic power storage device according to claim 6 , wherein the insulating sheet has a thickness within a range of 100 μm to 300 μm.