Method of testing secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroshi Hamaguchi
Life of this patent
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Abstract
A method of testing a secondary battery includes step A of charging the secondary battery to a predetermined charge voltage, step B of setting aside the secondary battery for a predetermined time (tb) after the step A, step C of discharging the secondary battery to a predetermined discharge voltage after the step B, and step D of detecting a battery voltage increase for a preset time (t2) after a predetermined time (t1) has elapsed after the step C. This method of testing a secondary battery can evaluate a measurement of how much the negative electrode active material layer covers the positive electrode active material layer based on the battery voltage increase detected in the step D.
Claims21
1-23. (canceled)
A method of testing a secondary battery including:
- a positive electrode current collector;
- a positive electrode active material layer retained on the positive electrode current collector;
- a negative electrode current collector;
- and
- a negative electrode active material layer retained on the negative electrode current collector and disposed so as to oppose the positive electrode active material layer,
- the negative electrode active material layer being wider than the positive electrode active material layer and disposed so as to cover the positive electrode active material layer, the method comprising:
- step A of charging the secondary battery to a predetermined charge voltage;
- step B of setting aside the secondary battery for a predetermined time after the step A;
- step C of discharging the secondary battery to a predetermined discharge voltage after the step B;
- and
- step D of detecting a battery voltage increase for a preset time after a predetermined time has elapsed after the step C.
Dependencies are inferred from the claim text.