Apparatus for mining battery characteristic data having sensitivity to solid phase diffusion coefficient of battery electrode and method thereof

An apparatus for mining battery characteristic data having sensitivity to a solid phase diffusion coefficient of a battery electrode, comprising:

• a storage unit configured to store data;
• a voltage measuring unit, a current measuring unit, and a temperature measuring unit, respectively, configured to measure voltage, current, and temperature of a battery;
• and
• a control unit operably coupled to the storage unit as well as the voltage measuring unit, the current measuring unit, and the temperature measuring unit,
• wherein the control unit is configured to:
• (a) generate a Pade approximation equation for a transcendental transfer function from a battery current to a particle surface concentration of lithium inserted into the electrode in a frequency domain;
• (b) generate a first state space model for the Pade approximation equation and a second state space model for partial derivative of a solid phase diffusion coefficient of the electrode with respect to the Pade approximation equation;
• (c) obtain a data stream including a voltage measurement value, a current measurement value and a temperature measurement value of the battery;
• (d) input the current measurement value into the first state space model to calculate the particle surface concentration of lithium inserted into the electrode;
• (e) input the current measurement value into the second state space model to calculate a change ratio of the particle surface concentration to the change in the solid phase diffusion coefficient;
• (f) calculate an open circuit potential slope corresponding to the calculated particle surface concentration using an open circuit potential function according to the particle surface concentration;
• (g) quantitatively estimate the sensitivity of a battery voltage for the solid phase diffusion coefficient of the electrode from the open circuit potential slope and the change ratio of the particle surface concentration to the change in the solid phase diffusion coefficient;
• and (h) select voltage-current data having sensitivity greater than or equal to a threshold and recording the same as mined characteristic data in the storage unit.