The invention discloses a lithium ion battery case with a good heat dissipation effect, which includes a housing, both sides of the top of the shell are provided with reserved holes, the inner cavityof the shell is provided with a lithium ion battery, At the top of the inn cavity of the shell, flexible heat conduction pads are fixedly connected on both sides of the lithium ion battery, heat conduction insulating rubber is fixedly connected on the side of the flexible heat conduction pads away from the lithium ion battery, and one end of the heat conduction insulating rubber away from the flexible heat conduction pads penetrates the shell and extends to the outside of the shell. In accordance with the present invention, Reserved holes, lithium ion batteries, flexible heat conduction pad, The heat conduction insulating rubber, the heat conduction gasket, the groove, the movable cover, the mounting plate, the mounting hole, the mounting groove, the bolt, the first port and the fan are arranged so as to not only fix the lithium ion battery, but also solve the problem that the heat dissipation effect of the traditional lithium ion battery case is not good, and the lithium ion battery case with good heat dissipation effect has the advantage of a good heat dissipation effect.