High-capacity power lithium battery and sealing plate thereof

The utility model discloses a high-capacity power lithium battery and a sealing plate thereof. The sealing plate comprises a metal substrate connected with the electrode terminal of a battery in a sealing and insulating manner, wherein a through hole is formed on the metal substrate; an inner step and an outer step are respectively arranged on the inner surface and the outer surface of the metal substrate and surround the through hole; and a plurality of first blind holes are distributed on the surface of the inner step at least. The sealing plate provided by the utility model can remarkably improve the compression of sealant and has favorable sealing performance.