The invention provides a
lithium ion battery, a preparation method and a
battery pack. The
lithium ion battery, namely a
paper battery, is formed by stacking a positive plate, a diaphragm and a negative plate and packaging the same with an outer
package, and the outer
package is not only used as a packaging layer, but also used as a
current collector. The preparation method comprises the steps of preparation of the positive plate, preparation of the negative plate and
assembly of the
paper battery. The
lithium ion battery pack is formed by connecting the paper batteries in series or in parallel. According to the
lithium ion battery, the preparation method and the
battery pack of the invention, a new packaging mode is adopted, and a Tab is not used any more. The new packaging mode saves the space of the Tab, improves the
energy density of the battery, and is fast in heat dissipation, in addition, the packaging mode is convenient for manufacturing a special-shaped battery; the cost of
battery cell materials can be reduced by 17%; the manufacturing cost of battery cells can be reduced by 30%; the volume
energy density of the battery cells is improved by 20%, and the
mass energy density is improved by 5%; and the safety of the battery is easier to guarantee.