Rechargeable battery module

1. A rechargeable battery module comprising:

a plurality of unit cells each comprising an electrode assembly, a first electrode terminal, and a second electrode terminal;

a bus bar coupling adjacent ones of the plurality of unit cells;

a first module terminal coupled to the first electrode terminal of one of the plurality of unit cells at one end of the unit cells;

a second module terminal coupled to the second electrode terminal of an other one of the plurality of unit cells at an opposite end of the unit cells; and

a module short-circuit member,

wherein, in a first state, the module short-circuit member is electrically coupled to one of the first module terminal or the second module terminal and is separated from the other one of the first module terminal or the second module terminal, and

wherein the module short-circuit member is configured to enter a second state from the first state according to temperature, and in the second state, the module short-circuit member contacts the other one of the first module terminal or the second module terminal.

2. The rechargeable battery module of claim 1 , wherein

the module short-circuit member has a bimetal structure, and

in the first state, the module short-circuit member is coupled to the second module terminal and is separated from the first module terminal by a first gap.

3. The rechargeable battery module of claim 1 , wherein the first module terminal comprises a first final terminal of the first electrode terminals of the plurality of unit cells, and

an end of a terminal extension is coupled to the first final terminal and a portion of the terminal extension is adjacent the second module terminal.

4. The rechargeable battery module of claim 3 , wherein the second module terminal comprises a second final terminal of the second electrode terminals of the plurality of unit cells, and

in the first state, the module short-circuit member is coupled to the second final terminal, is separated from either an upper side or a lower side of the terminal extension by a first gap, and is configured to bend toward said either the upper side or the lower side of the terminal extension according to a temperature of the second final terminal.

5. The rechargeable battery module of claim 3 , wherein

the second module terminal comprises a second final terminal of the second electrode terminals of the plurality of unit cells, and

in the first state, the module short-circuit member is coupled to the second final terminal, is separated from an other end of the terminal extension by a second gap, and is configured to expand toward the other end of the terminal extension according to a temperature of the second final terminal.

6. The rechargeable battery module of claim 5 , wherein the module short-circuit member comprises a shape memory alloy.

7. The rechargeable battery module of claim 3 , wherein, in the first state, the module short-circuit member is coupled to at least one second electrode terminal of the plurality of unit cells, is separated from either an upper side or a lower side of the terminal extension by a third gap, and is configured to bend toward said either the upper side or the lower side of the terminal extension according to a temperature of the second electrode terminal.

8. The rechargeable battery module of claim 1 , wherein the plurality of unit cells are arranged along a first direction,

the one of the plurality of unit cells is at the one end of the unit cells along the first direction, and

the other one of the plurality of unit cells is at the opposite end of the unit cells in the first direction.

9. The rechargeable battery module of claim 8 , wherein the plurality of unit cells comprises at least three unit cells.

10. The rechargeable battery module of claim 3 , wherein the terminal extension extends beyond a periphery of the unit cells.

11. The rechargeable battery module of claim 3 , wherein, in the first state, the end of the terminal extension is electrically coupled to the first final terminal.