Rectangular lithium ion secondary battery
AssigneePrime Planet Energy & Solutions, Inc.
InventorYusuke ITOH
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Abstract
A rectangular lithium ion secondary battery disclosed here includes an electrode body, an electrolyte, and a rectangular battery case housing the electrode body and the electrolyte. The battery case includes an outer case and a lid. The battery case includes a welded portion in which the outer case and the lid are joined by welding. The outer case includes a rectangular bottom wall facing the lid, a pair of long walls, and a pair of short walls. The electrode body has a flat portion in which a positive electrode and a negative electrode are stacked. At least one of the pair of long walls of the outer case includes a groove located between the lid and an end of the flat portion of the electrode body toward the lid in a direction perpendicular to the lid.
Claims5
A rectangular lithium ion secondary battery comprising:
- an electrode body;
- an electrolyte;
- and
- a rectangular battery case housing the electrode body and the electrolyte, wherein
- the battery case includes an outer case and a lid,
- the battery case includes a welded portion in which the outer case and the lid are joined by welding,
- the outer case includes a rectangular bottom wall facing the lid, a pair of long walls, and a pair of short walls,
- the electrode body includes a flat portion in which a positive electrode and a negative electrode are stacked, and
- at least one of the pair of long walls of the outer case has a groove located between the lid and an end of the flat portion of the electrode body toward the lid, in a direction perpendicular to the lid.
Dependencies are inferred from the claim text.