Foldable lithium ion battery cell and lithium ion battery

The utility model discloses a foldable lithium ion battery cell and lithium ion battery, the foldable lithium ion battery cell comprises a first roll core, a second roll core, a positive pole lug and a negative pole lug, the first roll core is provided with a first current collector section extending outwards, the second roll core is provided with a second current collector section extending outwards, the first current collector section is connected with the second current collector section, and the positive pole lug is connected with the negative pole lug. The first roll core and the second roll core are connected in parallel to form a roll core body, and the positive tab and the negative tab are arranged on the roll core body. And the first roll core and the second roll core are connected through the first current collector section and the second current collector section to form the roll core body in parallel, so that a folding function is realized on a single battery cell layer, the packaging process flow