钠电池的叠片工艺是什么？

What is the stacking process for sodium-ion batteries?

叠片是大容量、长循环、高安全方形铝壳电芯高端成型工艺，将分切后的单片正极、隔膜、负极逐层交替平铺堆叠。标准结构隔膜隔离每一层正负极，无卷绕带来的弯曲拉伸应力，堆叠完成后隔膜包裹电芯四周固定。完整工艺流程：单片极片定位裁切、机械手自动交替叠片、电芯包膜整形。叠片电芯每层极片完全平铺受力均匀，内部散热通道充足，大功率放电温升低，循环衰减平缓，模组压差小；无圆心空白区域，空间利用率更高。短板为设备投入成本高，机械手叠片生产速度慢，单瓦时制造成本高于卷绕工艺。适配 200Ah 以上工商业储能、电网调频、大功率叉车等高附加值长寿命产品，追求超长循环与高热安全标准的储能电站全部采用叠片电芯，是高端储能项目标配装配方案。

Stacking is a high-end forming process for large-capacity, long-cycle, high-safety square aluminum-shell cells. Slit single cathodes, separators and anodes are alternately laid flat layer by layer. The standard structure uses separators to isolate each layer of cathodes and anodes without bending tensile stress generated by winding, and separators wrap around the cell for fixation after stacking. The complete flow covers positioning slitting of single electrodes, automatic alternating stacking by manipulators and film wrapping & shaping of cells. Each electrode sheet of stacked cells lies fully flat with uniform stress, sufficient internal heat dissipation channels, low temperature rise under high-power discharge, gentle capacity fading and small module voltage difference, without blank core space for higher space utilization. Its shortcoming is high equipment investment, slow manipulator stacking speed and higher manufacturing cost per Wh than winding. It is suitable for high-value long-life products above 200Ah such as industrial & commercial energy storage, grid frequency regulation and high-power forklifts. All energy storage power stations pursuing ultra-long cycle and high thermal safety standards adopt stacked cells, the standard assembly scheme for high-end energy storage projects.