Flame-retardant and explosion-proof battery pack for electric vehicle and manufacturing method thereof

A flame-retardant and explosion-proof battery pack for an electric vehicle, comprising:

• a battery pack cover and a battery pack container, which define a sealed second storage space;
• at least one battery brick consisting of a plurality of batteries, which are electrically connected to define a positive electrode welding sheet and a negative electrode welding sheet;
• a battery brick positive electrode conducting wire and a battery brick negative electrode conducting wire, which are electrically connected to the positive electrode welding sheet and the negative electrode welding sheet, respectively;
• a battery brick cover and a battery brick container, which define a first storage space that is sufficient to accommodate the plurality of electrically-connected batteries;
• and
• wherein the first storage space is filled with a flame-retardant oil so that the plurality of electrically-connected batteries are immersed in the flame-retardant oil so as to isolate the plurality of electrically-connected batteries from contact with air, and the battery brick positive electrode conducting wire and the battery brick negative electrode conducting wire are exposed outside the first storage space to form a battery brick assembly;
• wherein the second storage space is sufficient to accommodate at least one battery brick assembly without a heat exchange device, and the second storage space is filled with the flame-retardant oil so that the battery brick assemblies are immersed in the flame-retardant oil;
• wherein the plurality of batteries is arranged in a tilt direction so that electrolyte leakage is avoided;
• wherein the flame-retardant oil has a heat capacity that is 2,200 J/Kg.