Storage container with sensor device and refrigerator having the same

1. A refrigerator comprising:

a storage container comprising a storage space to store food;

a plurality of measurement terminals having ends that are exposed to the storage space; and

a sensor device comprising a case, a plurality of electrode terminals, and a battery mounted in the case, to apply a voltage to the plurality of electrode terminals,

wherein the sensor device is detachably mounted to the storage container,

wherein the plurality of electrode terminals are configured to selectively be used as one of a plurality of charging terminals to charge the battery and a plurality of connecting terminals to connect with the plurality of measurement terminals based on whether the sensor device is detached from the storage container, and

wherein an inner surface of the storage container includes a sensor surface adjacent to the ends of the measurement terminals, and the sensor surface includes at least one stepped surface to prevent the ends of the measurement terminals, which are exposed to the storage space, from coming into direct contact with food stored in the storage space.

2. The refrigerator according to claim 1 , wherein the storage container includes a sensor seat formed at one surface of the storage container, to allow the sensor device to be seated on the sensor seat.

3. The refrigerator according to claim 2 , wherein the sensor seat of the storage container is formed at the surface of the storage container in the form of a recess.

4. The refrigerator according to claim 2 , wherein the sensor seat of the storage container is provided with the plurality of measurement terminals to come into contact with the electrode terminals of the sensor device.

5. The refrigerator according to claim 4 , wherein the sensor seat includes steps, at which the measurement terminals are arranged.

6. The refrigerator according to claim 2 , further comprising:

a coupling unit to separably couple the sensor device to the sensor seat,

wherein the coupling unit comprises a fitting slot at one of the sensor seat and the sensor device, and a fitting protrusion at the other one of the sensor seat and the sensor device.

7. The refrigerator according to claim 2 , further comprising:

a sensor cover to close the sensor seat, thereby preventing the sensor device from being separated from the sensor seat.

8. The refrigerator according to claim 7 , further comprising:

an engagement unit to detachably mount the sensor cover,

wherein the engagement unit comprises an engagement protrusion at one of the sensor seat and the sensor cover, and an engagement groove at the other one of the sensor seat and the sensor cover.

9. The refrigerator according to claim 2 , wherein the sensor seat is formed at a bottom wall of the storage container or a side wall extending around the bottom wall.

10. The refrigerator according to claim 1 , wherein:

the sensor device further comprises a charging circuit to charge the battery; and

the sensor device is charged by an external charger after being separated from the storage container.

11. The refrigerator according to claim 10 , wherein the sensor device further comprises separate charging terminals connected to the external charger.

12. The refrigerator according to claim 10 , wherein the sensor device is connected to the external charger via the electrode terminals.

13. The refrigerator according to claim 10 , wherein the external charger is integrated with the refrigerator.

14. The refrigerator according to claim 13 , wherein the external charger comprises a sensor receiver to receive the sensor device, and a plurality of charging electrodes provided at the sensor receiver.

15. The refrigerator according to claim 14 , further comprising:

a charger cover to cover the sensor receiver.