Sub-battery pack, battery pack having the sub-battery pack, portable ultrasonic scanning apparatus using the sub-battery pack and battery pack, and cart carrying the sub-battery pack, battery pack and portable ultrasonic scanning apparatus

1. A battery pack comprising:

a case;

at least one receptacle defined in the case and configured to accommodate at least one battery that supplies power to a portable ultrasonic scanning apparatus;

at least one first terminal installed to the at least one receptacle, the at least one first terminal coming into contact with a terminal of the battery when the battery is accommodated in the at least one receptacle; and

a second terminal electrically connected to the at least one first terminal, the second terminal being electrically connected to the portable ultrasonic scanning apparatus.

2. The battery pack according to claim 1 , wherein the at least one receptacle includes plural receptacles partitioned from one another.

3. The battery pack according to claim 2 , wherein the respective receptacles have different sizes of receiving spaces to accommodate different sizes of batteries.

4. The battery pack according to claim 3 , wherein the respective receptacles have different widths or lengths.

5. The battery pack according to claim 1 , wherein the first terminal is installed on a wall surface of the at least one receptacle.

6. The battery pack according to claim 1 , wherein the second terminal is installed on an outer surface of the case.

7. The battery pack according to claim 1 , wherein the at least one first terminal includes plural first terminals, and the plural first terminals are separate from one another with respect to the second terminal.

8. The battery pack according to claim 1 , wherein the at least one first terminal includes plural first terminals, the plural first terminals are connected to one another in parallel, and the second terminal is connected in series to the plural first terminals.

9. A battery pack comprising:

a first sub-battery pack including a first case, a first receptacle defined in the first case to accommodate a battery that supplies power to a portable ultrasonic scanning apparatus, and a first coupler installed to the exterior of the first case; and

a second sub-battery pack including a second case, a second receptacle defined in the second case to accommodate a battery that supplies power to the portable ultrasonic scanning apparatus, and a second coupler installed to the exterior of the second case to enable coupling between the first sub-battery pack and the second sub-battery pack.

10. The battery pack according to claim 9 , wherein each of the first and second sub-battery packs includes a first terminal installed on the first or second receptacle to come into contact with a terminal of the battery when the battery is mounted in the first or second receptacle, and a second terminal electrically connected to the first terminal, the second terminal being electrically connected to the portable ultrasonic scanning apparatus.

11. The battery pack according to claim 9 , wherein the first coupler includes a boss, and the second coupler includes a groove for sliding coupling with the boss.

12. The battery pack according to claim 9 , wherein the first and second couplers are disposed near corners of vertical outer surface edges of the first and second cases.

13. A sub-battery pack comprising:

a case;

a receptacle defined in the case and configured to accommodate a battery that supplies power to a portable ultrasonic scanning apparatus;

a first terminal installed to the receptacle, the first terminal coming into contact with a terminal of the battery when the battery is accommodated in the receptacle;

a second terminal electrically connected to the first terminal, the second terminal being electrically connected to the portable ultrasonic scanning apparatus; and

a coupler installed to the exterior of the case to allow the sub-battery pack to be coupled to another sub-battery pack.

14. The sub-battery pack according to claim 13 , wherein the coupler includes a boss for sliding coupling with a groove formed in another sub-battery pack, or a recess for sliding coupling with a boss formed at another sub-battery pack.

15. The sub-battery pack according to claim 13 , wherein the coupler is disposed near a corner of a vertical outer surface edge of the case.