All solid state lithium battery is a kind of lithium battery which uses solid electrode materials and solid electrolyte materials and does not contain any liquid. It mainly includes all solid state lithium ion battery and all solid metal lithium battery. The difference is that the negative pole of the former does not contain metal lithium, and the negative pole of the latter is metal lithium. 1、 Overview of solid state lithium battery All solid state lithium battery is a kind of lithium battery which uses sol