Abstract: A beverage can heating device includes a container body having a hollow bottom cover filled with water and covered with a plastic film, an inner cylinder having a detachable bottom cap with bottom teeth facing the plastic film, and a chemical material received within the space defined between the container body and the inner cylinder, whereby when a beverage can is inserted into the inner cylinder and pressed against the bottom cap of the inner cylinder, the bottom cap is disconnected from the inner cylinder causing the plastic film pierced by the bottom teeth permitting the chemical material to mix with water in producing a chemical reaction and releasing heat to warm up the contents of the beverage can.

Abstract: A container cap for vise with a self-heating tin container having a chemical compound on one end for releasing heat upon mixing with a liquid catalyzer. The container cap has an annular groove on the bottom around the border into which a peripheral flange on a self-heating tin container is inserted for positioning, a pointed member on the inside surface of the elastic top edge thereof, a film covering covered over the pointed member to hold a liquid catalyzer. Pressing the elastic top edge of the container cap against the tin container to which the container cap is fastened causes the pointed member to pierce the film covering permitting the liquid catalyzer to flow out of the container cap for mixing with the chemical compound in the tin container.