Abstract: Disclosed is a battery module including a plurality of plate-shaped battery cells which are sequentially stacked, wherein the battery module is configured to have a structure in which two or more hexahedral cell units are connected to each other in series in a state in which the hexahedral cell units are stacked, each of the cell units is configured to have a structure in which two or more battery cells are connected to each other in series in a state in which the battery cells are in tight contact with each other, and electrode terminals (outermost electrode terminals) of outmost battery cells of the cell units are connected to external input and output terminals of the battery module, the outermost electrode terminals having a larger vertical sectional area than electrode terminals of the other battery cells such that the outermost electrode terminals are prevented from being broken by external force.

Abstract: Disclosed herein is a battery pack configured such that battery modules, each of which includes a plurality of battery cells or unit modules connected to each other in series, are connected to each other in series in a state in which the battery modules are in tight contact with each other or stacked adjacent to each other, the battery pack including a fuse connected in series in an electrical connection circuit between the battery modules and a circuit breaker mounted at an outside of at least one of the battery modules to perform electric conduction when the battery cells swell, the circuit breaker being electrically connected to the electrical connection circuit to break the fuse when electric conduction is performed due to swelling of the battery cells.

Abstract: Disclosed is a battery module including a plurality of plate-shaped battery cells which are sequentially stacked, wherein the battery module is configured to have a structure in which two or more hexahedral cell units are connected to each other in series in a state in which the hexahedral cell units are stacked, each of the cell units is configured to have a structure in which two or more battery cells are connected to each other in series in a state in which the battery cells are in tight contact with each other, and electrode terminals (outermost electrode terminals) of outmost battery cells of the cell units are connected to external input and output terminals of the battery module, the outermost electrode terminals having a larger vertical sectional area than electrode terminals of the other battery cells such that the outermost electrode terminals are prevented from being broken by external force.

Abstract: Disclosed herein is a battery pack configured such that battery modules, each of which includes a plurality of battery cells or unit modules connected to each other in series, are connected to each other in series in a state in which the battery modules are in tight contact with each other or stacked adjacent to each other, the battery pack including a fuse connected in series in an electrical connection circuit between the battery modules and a circuit breaker mounted at an outside of at least one of the battery modules to perform electric conduction when the battery cells swell, the circuit breaker being electrically connected to the electrical connection circuit to break the fuse when electric conduction is performed due to swelling of the battery cells.

Abstract: Provided are a secondary battery, a battery module, and a battery pack, which have improved safety. Particularly, since a bulletproof material is disposed on the inside and/or the outside of an exterior part, even when a conductive needle-shaped member penetrates a secondary battery, heating, burning, discharge of evaporated electrolyte, and electrical contact between the needle-shaped member and an electrode can be prevented, thereby improving safety of the secondary battery, the battery module, and the battery pack.