Method and device for forecasting thermal runaway safety of power battery, and a method for making power battery

A method for making a full battery, comprising:

• making a plurality of first power batteries, wherein the first power battery is a half cell;
• obtaining a self heat generation onset temperature T0 of the first power battery;
• establishing a thermal runaway reaction kinetic model, wherein the establishing the thermal runaway reaction kinetic model comprises:
• assembling a plurality of second power batteries, each of the plurality of second power batteries comprises a plurality of second component materials, and the plurality of second component materials comprises a cathode electrode plate, an anode electrode plate, a separator, and an electrolyte;
• performing a charging test and a discharging test on each of the plurality of second power batteries;
• obtaining a plurality of testing component materials by disassembling some of the plurality of second power batteries in a fully charged state and disassembling others of the plurality of second power batteries in a completely discharged state, wherein the plurality of testing component materials comprises a fully charged cathode electrode plate, a completely discharged cathode electrode plate, a fully charged anode electrode plate, a completely discharged anode electrode plate, the separator, and the electrolyte;
• obtaining a thermal runaway reaction and a plurality of parameters of the thermal runaway reaction of each of the plurality of testing component materials by performing a differential scanning calorimetry test on each of the plurality of testing component materials;
• and
• establishing the thermal runaway reaction kinetic model according to a reaction kinetics equation, a mass conservation equation, a energy conservation equation, and the plurality of parameters of the thermal runaway reaction, wherein the thermal runaway reaction kinetic model satisfies a first formula:
• T
• =
• ∫
• t
• 
• dT
• dt
• 
• dt
• +
• T
• 0
• wherein T represents a temperature of the first power battery or the second power battery, T0 represents a self heat generation onset temperature of the first power battery or the second power battery, T0 is equal to a minimum of onset temperatures Tonset,x of all the thermal runaway reactions, and
• dT
• dt
• represents a temperature rise rate of the first power battery or the second power battery;
• calculating a maximum temperature Tmax of thermal runaway of the first power battery based on the thermal runaway reaction kinetic model by a computer;
• determining the thermal runaway safety of the first power battery by comparing the maximum temperature Tmax of thermal runaway of the first power battery with a threshold temperature Tthreshold;
• selecting some of the plurality of first power batteries which have the maximum temperature Tmax less than or equal to the threshold temperature Tthreshold as selected first power batteries;
• and
• assembling a full battery comprising one of the selected first power batteries to prevent or mitigate thermal runaway.

A method for making a full battery, comprising:

• assembling a plurality of power batteries, each of the plurality of power batteries comprises a plurality of component materials, and the plurality of component materials comprises a cathode electrode plate, an anode electrode plate, a separator, and an electrolyte;
• performing a charging test and a discharging test on each of the plurality of power batteries;
• obtaining a plurality of testing component materials by disassembling some of the plurality of power batteries in a fully charged state and disassembling others of the plurality of power batteries in a completely discharged state, wherein the plurality of testing component materials comprises a fully charged cathode electrode plate, a completely discharged cathode electrode plate, a fully charged anode electrode plate, a completely discharged anode electrode plate, the separator, and the electrolyte;
• obtaining a thermal runaway reaction and a plurality of parameters of the thermal runaway reaction of each of the plurality of testing component materials by performing a differential scanning calorimetry test on each of the plurality of testing component materials;
• establishing a thermal runaway reaction kinetic model according to a reaction kinetics equation, a mass conservation equation, a energy conservation equation, and the plurality of parameters of the thermal runaway reaction, wherein the thermal runaway reaction kinetic model satisfies a formula:
• dT
• dt
• wherein T represents a temperature of the power battery, T0 represents a self heat generation onset temperature of the power battery, T0 is equal to a minimum of onset temperatures Tonset,x of all the thermal runaway reactions, and
• SE
• cell
• =
• SC
• ca
• m
• am
• 
• /
• 
• m
• ca
• +
• 1
• ×
• V
• rate
• ×
• ζ
• act
• ×
• η
• act
• represents a temperature rise rate of the power battery;
• calculating a maximum temperature Tmax of thermal runaway of each of the plurality of power batteries based on the thermal runaway reaction kinetic model by a computer;
• determining the thermal runaway safety of the power battery by comparing the maximum temperature Tmax of thermal runaway of the power battery with a threshold temperature Tthreshold;
• selecting some of the plurality of power batteries which have the maximum temperature Tmax less than or equal to the threshold temperature Tthreshold as selected power batteries;
• and
• assembling a full battery comprising one of the selected power batteries to prevent or mitigate thermal runaway.