The invention discloses a
lithium ion battery plastic casing, a
lithium ion battery, and a manufacturing method of the
lithium ion battery plastic casing and the
lithium ion battery. The
lithium ion battery plastic casing comprises a main body and a cover plate; the main body and the cover plate are prepared via
injection moulding of a modified
polypropylene material comprising 35 to 76.9% of
polypropylene, 3 to 7.5% of a mineral filler, 15 to 20% of
glass fiber, 5% of grafted
polypropylene, and 0.1 to 2.5% of a
processing accessory ingredient. The
lithium ion battery comprises the lithium ion battery plastic casing. The manufacturing method of the lithium ion battery comprises following steps: 1, the modified polypropylene material is subjected to
injection moulding so as to obtain the main body and the cover plate; 2, a
battery cell is packaged with the main body, the cover plate is arranged at an opening of the main body, and sealing is carried out via heat melting
welding. The lithium ion battery plastic casing is simple in structure, low in production cost, smooth in appearance, uniform in color, high in strength, low in
weight loss, excellent in
aging resistance, and long in service life; no obvious
fiber exposure is observed; and deformation is not easily caused.