Patent ID: 8852782

Claim:
A battery pack, temperature of which is controllable, comprising: at least one battery module comprising a plurality of battery cells or unit cells which can be charged and discharged; a fluid channel formed such that a fluid to cool or heat the battery module passes through the battery module; a flow change unit located on the fluid channel to change a flow direction of the fluid based on a temperature state of the battery module; and an operation controller to control an operation of the flow change unit based on information regarding the temperature of the battery module, wherein the fluid channel comprises: a first channel, through which the fluid from an outside is introduced into the flow change unit; a second channel, through which the fluid from the flow change unit is discharged to the outside; a third channel, through which the fluid from the flow change unit is introduced into the battery module; and a fourth channel, through which the fluid from the battery module is discharged to the flow change unit, wherein the flow change unit selects a first connection mode for connection between the first channel and the third channel and connection between the second channel and the fourth channel or a second connection mode for connection between the first channel and the fourth channel and connection between the second channel and the third channel to decide the flow direction of the fluid, wherein the flow change unit comprises: a stationary part comprising: an external inlet port connected to the first channel; an external outlet port connected to the second channel; an internal inlet port connected to the third channel; and an internal outlet port connected to the fourth channel; and a rotating part rotatably mounted in the stationary part, the rotating part comprising: a first communication port capable of communicating with the external inlet port and the internal inlet port of the stationary part; a second communication port capable of communicating with the external outlet port and the internal outlet port of the stationary part; a third communication port capable of communicating with the external inlet port and the internal outlet port of the stationary part; and a fourth communication port capable of communicating with the external outlet port and the internal inlet port of the stationary part, and wherein the rotating part is configured to have a structure in which only the first communication port and the second communication port communicate with the inlet ports and the outlet ports in the first connection mode, and only the third communication port and the fourth communication port communicate with the inlet ports and the outlet ports in the second connection mode.