Battery Cell Evaluation System

A system for assessing attributes of battery cells, the system comprising:

• a plurality of battery cells, each battery cell having terminals;
• and
• a battery cell diagnostic apparatus comprising:
• control circuitry;
• a current source;
• measurement circuitry configured to measure electrical attributes of a battery cell among the plurality of battery cells and provide measurements of the electrical attributes to the control circuitry;
• a first multiplexer operably coupled to each of battery cells, the measurement circuitry, and the control circuitry;
• a second multiplexer operably coupled to each of the battery cells, the current source, and the control circuitry;
• wherein the control circuitry is configured to:
• control the first multiplexer to electrically connect the measurement circuitry to the battery cell;
• control the second multiplexer to electrically connect the current source to the battery cell to apply a current, output from the current source, at each of a set of frequencies to the battery cell;
• receive the measurements from the measurement circuitry corresponding to each of the frequencies within the set of frequencies, the set of frequencies including a first frequency that correlates to an electrolytic resistance of the battery cell, a second frequency that correlates to an anode impedance of the battery cell, and a third frequency that correlates to a cathode impedance of the battery cell;
• and
• store the measurements for the battery cell in a memory device.

A method for assessing attributes of battery cells, the method comprising:

• controlling, by control circuitry, a first multiplexer operably coupled to each battery cell within a plurality of battery cells to electrically connect measurement circuitry to a battery cell among the plurality of battery cells;
• controlling, by the control circuitry, a second multiplexer operably coupled to each battery cell within the plurality of battery cells to electrically connect a current source to the battery cell to apply a current, output from the current source, at each of a set of frequencies to the battery cell;
• receiving, at the control circuitry, measurements from the measurement circuitry corresponding to each of the frequencies within the set of frequencies, the set of frequencies including a first frequency that correlates to an electrolytic resistance of the battery cell, a second frequency that correlates to an anode impedance of battery cell, and a third frequency that correlates to a cathode impedance of the battery cell;
• and
• storing the measurements for the battery cell in a memory device.