Diagnostic system for battery module and vehicle
A diagnostic system for a battery module including a plurality of electric cells includes a displacement detector configured to detect a displacement of at least one of the electric cells during charging, and an electronic control unit configured to determine whether the battery module is a genuine product. The electronic control unit is configured to determine whether the battery module is the genuine product based on the displacement detected by the displacement detector.
1. A vehicle comprising:
a battery module including a plurality of electric cells, the battery module being configured to be recharged by electric power supplied from an external power supply; and
a diagnostic system for the battery module, wherein the diagnostic system comprises
a displacement meter configured to detect a displacement of at least one of the electric cells during the recharging, and
a processor configured to
acquire the displacement detected by the displacement meter,
calculate a displacement amount of the at least one of the electric cells during the recharging and a slope of the displacement amount with respect to a charging electric energy, based on the acquired displacement, and
determine whether a first displacement amount is calculated, the first displacement amount being the displacement amount from a first predetermined state of charge to a second predetermined state of charge, wherein the processor determines that the battery module is a genuine product when the first displacement amount falls within a first range,
the processor is further configured to determine, when the first displacement amount is not calculated, whether a first slope of the displacement amount is calculated, the first slope being the slope of the displacement amount with respect to the charging electric energy from a third predetermined state of charge to a fourth predetermined state of charge, wherein the processor determines that the battery module is a genuine product when the first slope falls within a second range.
2. The vehicle according to claim 1 , wherein:
the battery module is an assembled battery including a stack of the electric cells;
each of the electric cells includes an electrode body and a case that houses the electrode body; and
the displacement is a change in a thickness of the case of the at least one of the electric cells.
3. The vehicle according to claim 1 , wherein:
the displacement meter is configured to detect the displacements of all the electric cells during the recharging; and
the processor is configured to
calculate an average of the displacement amounts of the electric cells during the recharging based on the displacements detected by the displacement meter, and
determine whether a first average of the displacement amounts is calculated, the first average of the displacement amounts being the average of the displacement amounts from the first predetermined state of charge to the second predetermined state of charge, wherein the processor determines that the battery module is the genuine product when the first average of the displacement amounts falls within the first range.
4. The vehicle according to claim 1 , wherein:
the displacement meter is configured to detect the displacements of all the electric cells during the recharging; and
the processor is configured to
calculate an average of the slopes of the displacement amounts with respect to the charging electric energy, based on the displacements detected by the displacement meter, and
determine whether a second average of the slopes of the displacement amounts is calculated, the second average of the slopes of the displacement amounts being the average of the slopes of the displacement amounts from the third predetermined state of charge to the fourth predetermined state of charge, wherein the processor determines that the battery module is the genuine product when the second average of the slopes of the displacement amounts falls within the second range.
5. The vehicle according to claim 3 , wherein:
the battery module is an assembled battery including a stack of the electric cells;
each of the electric cells includes an electrode body and a case that houses the electrode body; and
the displacement amounts are changes in thicknesses of the cases of all the electric cells.
6. The vehicle according to claim 4 , wherein:
the battery module is an assembled battery including a stack of the electric cells;
each of the electric cells includes an electrode body and a case that houses the electrode body; and
the displacement amounts are changes in thicknesses of the cases of all the electric cells.
7. The vehicle according to claim 1 , further comprising a display device configured to display an alert when the processor of the diagnostic system determines that the battery module is not the genuine product.
8. The vehicle according to claim 1 , wherein the genuine product determined by the processor is a battery module manufactured by an authorized manufacturer.
9. The vehicle according to claim 1 , wherein the first displacement amount is the displacement amount from a state of charge of 0% to a full charge capacity, or from a state of charge of 50% to a full charge capacity.
10. The vehicle according to claim 1 , wherein the processor is further configured to
acquire a weight and an initial weight of the battery module,
calculate a weight difference between the weight and the initial weight of the battery module, and
determine that the battery module is a non-genuine product when the weight difference is equal to or larger than a predetermined threshold value.
11. The vehicle according to claim 1 , wherein whether the battery module is the genuine product is determined in a case that the battery module is charged for a first time after the battery module is replaced.