Design method and application of roll core

The invention provides a design method and application of a roll core, and relates to the technical field of batteries. In the invention, the gap between the positive plate/diaphragm and the negative plate/diaphragm in the roll core is controlled by using the winding tension, the expansion rate of the positive plate/diaphragm and the negative plate/diaphragm in the charge-discharge process is controlled by matching the design of the positive electrode and the negative electrode, and the stress release in the charge-discharge process of the battery is skillfully improved by designing the matching of the gap and the expansion rate; and the cycle life of the battery is prolonged. 本发明提供了一种卷芯的设计方法及其应用，涉及电池技术领域。本发明中，通过利用卷绕张力来控制卷芯中正极片/隔膜和负极片/隔膜间的间隙，同时通过匹配正负电极的设计来控制正负极片充放电过程中的膨胀率，通过设计间隙和膨胀率的匹配来巧妙改善电池充放电过程中应力的释放，从而提高电池的循环寿命。