Battery module including LED element on PCB

1. A battery module comprising at least two battery cells, the battery module comprising:

a protective circuit board installed at a side surface of the battery module and electrically connected to the battery module;

at least one LED element installed on the protective circuit board and displaying changes in operating states of the battery cells;

a cover plate provided with a window for light transmission of the LED element and installed at a side surface of the battery module so as to surround the protective circuit board; and

a light-transmissive LED cover installed at an inner side of the cover plate to correspond to the window of the cover plate in order to emit light emitted from the LED element.

2. The battery module according to claim 1 , wherein the battery cells are plate type battery cells.

3. The battery module according to claim 2 , wherein the plate type battery cells are rectangular secondary batteries or pouch type secondary batteries.

4. The battery module according to claim 1 , wherein the battery cells are lithium secondary batteries.

5. The battery module according to claim 1 , wherein the operating states comprise at least one selected from the group consisting of charge and discharge states of the battery cells, abnormal operating states according to change in temperature of the battery cells or change in volume of the battery cells, and capacity of the battery cells.

6. The battery module according to claim 1 , wherein the LED cover comprises a light guide plate for transmitting light in a diffuse reflection manner.

7. The battery module according to claim 6 , wherein the light guide plate has an uneven surface so as for transmitted light to be refracted and scattered.

8. The battery module according to claim 6 , wherein the light guide plate comprises a light-transmissive plastic material.

9. The battery module according to claim 1 , wherein the cover plate comprises a coupling part provided at an inner center thereof so as to simultaneously fix the protective circuit board and the LED cover.

10. The battery module according to claim 1 , wherein the cover plate is further provided at an outer surface thereof with an exterior cover.

11. The battery module according to claim 1 , wherein the battery module comprises: a base plate comprising accommodation parts provided on upper surfaces thereof with battery cells mounted in a state in which electrode terminals are arranged in a side direction and provided at peripheries thereof with upwardly bent sidewalls; and an upper cover plate provided at opposite sides thereof with downwardly bent sidewalls based on the electrode terminals of the battery cells and fixed to an upper surface of the base plate to form an upper surface of the battery module.

12. The battery module according to claim 11 , wherein the base plate and the upper cover plate are fixed to each other via a bracket.

13. The battery module according to claim 12 , wherein the bracket has a first side coupled to a sidewall of the base plate by welding and a second side coupled to a sidewall of the upper cover plate by fastening.

14. A battery pack comprising the battery module according to claim 1 .

15. A device comprising the battery pack according to claim 14 as a power source.

16. The device according to claim 15 , wherein the device is selected from the group consisting of power tools; electric vehicles (EVs), hybrid EVs (HEVs), and plug-in HEVs (PHEVs); E-bikes; E-scooters; electric golf carts; and systems for storing power.