Winding type lithium battery cell

The utility model discloses a winding type lithium battery cell which comprises a shell, an end cover part is clamped at one end of the shell, an insert is integrally formed in the shell, a cell body inserted in the shell is sleeved outside the insert, the cell body comprises a positive plate, a negative plate and an isolating membrane, and the positive plate, the negative plate and the isolating membrane are wound together. The isolating membrane is located between the positive plate and the negative plate, grooves distributed in an equidistant structure are formed in the outer walls of the two sides of the shell, and a plurality of line grooves distributed in an equidistant structure are formed in the outer walls of one sides of the positive plate and the negative plate. Due to the design of the line grooves, the areas of the positive plate and the negative plate can be increased under the same isolating membrane, so that the energy density of a battery cell formed by the positive plate, the negative plate