First, you need 1 invention patents or 5 utility models.
Second, 15~ 18 patent is needed.
Personally, I think it is safe for enterprises to provide 15~ 18 patents. Although enterprises will spend more on patent applications, the more patents, the greater the possibility of getting high marks. Therefore, if you want to pass the high appraisal with high probability, you can't be stingy in patent application.