Abstract: A battery cooling device includes a shell, a cooling channel arranged inside the shell and configured to allow flowing of cooling fluids and restrict flowing directions of the cooling fluids along the cooling channels, a cooling fluid flow regulation component arranged inside the shell and configured to be deformed from a first opening degree to a second opening degree when the temperature rises where the fluid flow at the first opening degree is less than the fluid flow at the second opening degree, and a regulation component deformation restriction component arranged inside the shell and configured to be deformed from a first configuration to a second configuration when the temperature rises.

Abstract: A positive electrode sheet includes a current collector, a resistance layer disposed on the current collector, and a positive electrode active material layer. The current collector includes a coating region and a non-coating region. The resistance layer includes a conductive agent and a first binder. The positive electrode active material layer includes a positive electrode active material, a conductive agent, and a second binder. A resistance of the resistance layer is greater than a resistance of the positive electrode active material layer. In a cross section of the positive electrode sheet, a projection of a part of the positive electrode active material layer on the current collector overlaps with a projection of the resistance layer on the current collector, and a projection of another part of the positive electrode active material layer on the current collector does not overlap with the projection of the resistance layer on the current collector.