The current collector fracture failure of lithium-ion batteries (LIBs) occurs during its winding production process frequently, and the consequent damages are usually large, but little research has been conducted on this phenomenon. This work stems from the difficulty and obstacles in the winding process of actual production of LIBs. The fracture failure of the current collectors is easily caused by the evolution and mutation of the mechanical behavior during the winding process, resulting in safety hazards and poor efficiency. The purpose of this work is to reveal the evolution and distribution mechanism of circumferential strain of the current collectors on the fracture failure under the constraint of winding process. Experimental tests, finite element calculations and theoretical model are used to study the evolution and distribution of circumferential strain. The dynamic evolution process of circumferential strain is tested accurately, and the mechanism of fracture failure of current collectors is revealed. The criterion for current collector strength is proposed based on the results of strain analysis and SEM observation.

锂离子电池（LIB）的集电器断裂经常发生在其绕组生产过程中，因此造成的损坏通常很大，但是对此现象的研究很少。这项工作源于LIB实际生产过程中的困难和障碍。集电器的断裂故障很容易由缠绕过程中机械行为的演变和突变引起，从而导致安全隐患和效率低下。这项工作的目的是揭示在缠绕过程的约束下，集电器的周向应变对断裂破坏的演化和分布机理。实验测试 利用有限元计算和理论模型研究了周向应变的演化和分布。准确测试了周向应变的动态演化过程，揭示了集电器断裂破坏的机理。基于应变分析和SEM观察的结果，提出了集电器强度的判据。