提出一种利用多角度X射线投影测量叠片型锂电池阴阳极片之间最小包覆值的方法，通过对叠片电池进行平移和旋转，对电池4个角分别投影，并利用投影长度计算电池阴极片顶点到对应阳极片边缘的最小距离。与同类检测方法比较，检测过程中，无需测量电池旋转角度的具体值，所需角度信息可由投影计算得出，有效避免了由角度控制不精确引起的误差。该方法检测效率高，成本低，作为传统X射线投影检测到CT在线检测间的过渡方案，更符合实际现阶段工业生产的需要。

A method to measure the misalignment between cathode layers and anode layers of a laminated lithium battery was proposed by using multi angle X-ray projections. By translating and rotating the laminatedbattery, X-ray radiographs were taken from its four corners respectively. The length of the projection was used to calculate the minimum distance from the vertex of the cathode layer to the edge of the corresponding anode layer. In this method, the rotation angle of the battery was arbitrary, effectively reducing the error caused by inaccurate angle control during determination. Besides, this method waseconomic and efficient. As a transition technique from traditional X-ray radiography to online CT, it wasmore in line with the actual needs of industrial production at current stage.