BATTERY, ELECTROLYTE, BATTERY PACK, ELECTRONIC DEVICE, ELECTRIC MOTOR VEHICLE, ELECTRICAL STORAGE DEVICE, AND POWER SYSTEM

A battery includes electrodes including a positive electrode and a negative electrode; and a particle-containing insulating part that is provided between the positive electrode and the negative electrode and includes particles and a resin, wherein the particles are a material capable of undergoing an endothermic dehydration reaction and have a flat shape with an aspect ratio of 2/1 or more.