(JP10003950-A)      The power supply unit comprises a group of batteries including several rows of cells (1) arranged in parallel, each row of cells including cylindrical cells connected in series. Refrigerant passages pass a refrigerant through space portions formed between the rows of cells.    The refrigerant passages include main passages (5) exposed to the cells arranged in the row of cells, and auxiliary refrigerant passages (4). The upstream sides of the auxiliary passages are isolated from the rows of cells, and the downstream sides are connected to the main passages at positions corresponding to the midstream or downstream sides of the rows of cells.    ADVANTAGE -   Provides highly reliable power supply unit having small variations in characteristics among cells by decreasing temperature difference among cells. Has relatively high output voltage and large output current.    (JP10021891-A)      The power supply unit comprises a group of batteries including several rows of cells (1) arranged in parallel, each row of cells including cylindrical cells connected in series. Refrigerant passages pass a refrigerant through space portions formed between the rows of cells.    The refrigerant passages include main passages (5) exposed to the cells arranged in the row of cells, and auxiliary refrigerant passages (4). The upstream sides of the auxiliary passages are isolated from the rows of cells, and the downstream sides are connected to the main passages at positions corresponding to the midstream or downstream sides of the rows of cells.    ADVANTAGE -   Provides highly reliable power supply unit having small variations in characteristics among cells by decreasing temperature difference among cells. Has relatively high output voltage and large output current.    (US5879833-A)      The power supply unit comprises a group of batteries including several rows of cells (1) arranged in parallel, each row of cells including cylindrical cells connected in series. Refrigerant passages pass a refrigerant through space portions formed between the rows of cells.    The refrigerant passages include main passages (5) exposed to the cells arranged in the row of cells, and auxiliary refrigerant passages (4). The upstream sides of the auxiliary passages are isolated from the rows of cells, and the downstream sides are connected to the main passages at positions corresponding to the midstream or downstream sides of the rows of cells.    ADVANTAGE -   Provides highly reliable power supply unit having small variations in characteristics among cells by decreasing temperature difference among cells. Has relatively high output voltage and large output current.