Trapezoid battery, battery cell and manufacturing method thereof

The invention provides a trapezoid battery, a battery cell and a manufacturing method thereof. The battery cell is formed by integrally winding a positive pole piece and a negative pole piece, which are isolated from each other, and is provided with a positive tab connected with the positive pole piece and a negative tab connected with the negative pole piece; the battery cell comprises an inner layer part and an outer layer part; the positive tab and the negative tab are led out from the inner layer part; the outer layer part covers the periphery of the inner layer part; at least one step part is arranged on the contour of the outer layer part. According to the trapezoid battery, the battery cell and the manufacturing method thereof, the requirements of sufficiently utilizing a capacity space of an abnormal-shape battery on application equipment can be met very well. 种梯形电池、电芯及其制造方法，该电芯采用相互隔离的正极片和负极片体卷绕而成，具有与该正极片相连的正极耳和与该负极片相连的负极耳；该电芯包括内层部分，该正极耳和负极耳由该内层部分引出；以及包覆在该内层部分外周的外层部分；其中，该外层部分的外形轮廓具有至少阶台部。本发明能够很好地满足充分利