The invention relates to a cooling
system, a
battery pack and a vehicle, the cooling
system comprises a liquid cooling plate and a
refrigerant release
assembly, the interior of the liquid cooling plate is provided with a flow channel for allowing a
refrigerant to flow, the liquid cooling plate is used for cooling a
battery cell, the
refrigerant release
assembly is arranged between the liquid cooling plate and the
battery cell, and the refrigerant release
assembly is at least partially made of a thermal actuating material; and the refrigerant release assembly can release the refrigerant in the runner when the temperature of the
battery cell reaches a preset temperature threshold value. When the
battery pack works normally, the refrigerant in the flow channel can exchange heat with the battery cells and take away heat generated by the battery
cell group, so that the effective cooling of the battery is realized; when the temperature of the
battery pack rises or
thermal runaway occurs, the refrigerant release assembly made of the thermal actuating material deforms or changes the state under the influence of the temperature, so that the refrigerant in the flow channel of the liquid cooling plate is released, and the refrigerant in the flow channel can be directly released to directly flow to the battery
cell and is in direct contact with the battery
cell; and efficient heat dissipation of the battery pack is realized.