Battery internal temperature information processing method, computer device, and storage medium

A device for processing battery internal temperature information comprising a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor executes the computer-readable instructions to operations comprising:

• obtaining off-line testing data of a battery module subject to an off-line test under different off-line operating conditions in an environment having a constant temperature, by:
• obtaining off-line temperature data and equivalent circuit data of the battery module under the different off-line operating conditions for performing the off-line test, wherein the equivalent circuit data includes a battery terminal voltage value and a battery current value of the battery module;
• wherein the obtaining off-line temperature data comprises:
• disposing a first temperature sensing device inside a pole of a cell of the battery module and measuring an off-line internal temperature of the cell;
• disposing second temperature sensing devices to surfaces of the cell and measuring off-line surface temperatures of the surfaces of the cell;
• and
• disposing a third temperature sensing device to a cooling plate of a cooling system connected to the battery module and measuring an off-line temperature of the cooling plate, wherein the first temperature sensing device, the second temperature sensing devices, and the third temperature sensing device are of a same type of sensing devices;
• obtaining multiple sets of initial parameters of an equivalent thermal network model according to the off-line testing data, and determining a set of optimal model parameters among the sets of initial parameters of the equivalent thermal network model based on a multi-objective function fitting method;
• obtaining an initial state vector value of a battery comprising the battery module of a vehicle and first operating data of the battery of the vehicle at a first moment during an actual operation of the vehicle;
• determining an estimate of an internal temperature of the battery at the first moment according to the initial state vector value, the first operating data, and the equivalent thermal network model including the set of optimal model parameters of the actual operation,
• wherein after obtaining the off-line temperature data and the off-line testing data of the battery module, the method comprises:
• obtaining a first open circuit voltage and a first temperature coefficient of the battery module from a database;
• grouping and inputting the battery terminal voltage value, the battery current value, and the off-line internal temperature into a first heat production rate model, and obtaining a first battery heat production rate of the battery module output from the first heat production rate model under the different off-line operating conditions;
• wherein a set of a battery terminal voltage value, a battery current value, and an off-line internal temperature comprises the battery terminal voltage value, the battery current value, and the off-line internal temperature corresponding to a same moment under a same off-line operating condition.

A non-transitory computer readable storage medium storing computer-readable instructions, wherein when the computer-readable instructions are executed by a processor, the processor is caused to perform operations comprising:

• obtaining off-line testing data of a battery module subject to an off-line test under different off-line operating conditions in an environment having a constant temperature, by:
• obtaining off-line temperature data and equivalent circuit data of the battery module under the different off-line operating conditions for performing the off-line test, wherein the equivalent circuit data includes a battery terminal voltage value and a battery current value of the battery module;
• wherein the obtaining off-line temperature data is obtained by:
• disposing a first temperature sensing device inside a pole of a cell of the battery module and measuring an off-line internal temperature of the cell;
• disposing second temperature sensing devices to surfaces of the cell and measuring off-line surface temperatures of the surfaces of the cell;
• and
• disposing a third temperature sensing device to a cooling plate of a cooling system connected to the battery module and measuring an off-line temperature of the cooling plate, wherein the first temperature sensing device, the second temperature sensing devices, and the third temperature sensing device are of a same type of sensing devices;
• obtaining multiple sets of initial parameters of an equivalent thermal network model according to the off-line testing data, and determining a set of optimal model parameters among the sets of initial parameters of the equivalent thermal network model based on a multi-objective function fitting method;
• obtaining an initial state vector value of a battery comprising the battery module of a vehicle and first operating data of the battery of the vehicle at a first moment during an actual operation of the vehicle;
• determining an estimate of an internal temperature of the battery at the first moment according to the initial state vector value, the first operating data, and the equivalent thermal network model including the set of optimal model parameters of the actual operation,
• wherein after obtaining the off-line temperature data and the off-line testing data of the battery module, the method comprises:
• obtaining a first open circuit voltage and a first temperature coefficient of the battery module from a database;
• grouping and inputting the battery terminal voltage value, the battery current value, and the off-line internal temperature into a first heat production rate model, and obtaining a first battery heat production rate of the battery module output from the first heat production rate model under the different off-line operating conditions;
• wherein a set of a battery terminal voltage value, a battery current value, and an off-line internal temperature comprises the battery terminal voltage value, the battery current value, and the off-line internal temperature corresponding to a same moment under a same off-line operating condition.