They are not actual coins. The side being replicated is the Manchu-language side of Chinese cash coins, rather than the (more important) Chinese-language side, with the four characters.
Given that they are (a) cheaply made, and (b) appear to have been burned, my assumption would be that this is funeral money. It has long been the practice in China and amongst the Chinese diaspora to burn replicas of money and worldly goods at funerals, with the aim of providing the deceased with those things for a pleasant afterlife.
The communist regime in mainland China frowns upon this traditional practice, seeing it as both superstitious and capitalist, but permits it so long as the fires are not too large or extravagant.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis