Provided are a cell module and a battery system. The cell module includes: a cell fixing bracket, multiple rows of cell groups and a liquid cooling plate. Specifically, all of the cell groups are disposed on the cell fixing bracket, each row of cell group includes multiple cells, each row of cell group other than a first row of cell group and a last row of cell group has a first spacing H from an adjacent row of cell group, and has a second spacing h from another adjacent cell group, and the first spacing H is greater than the second spacing h. The liquid cooling plate is disposed between the two rows of cell groups spaced apart by the first spacing H, and is configured to regulate the temperature of multiple cells near the liquid cooling plate. The liquid cooling plate is installed between the two rows of cell groups separated by the first spacing, thus the distance between the two rows of cell groups with no liquid cooling plate disposed therebetween can be saved on the basis that the temperature of the cells can be controlled, so that the structure of the cell module can be more compact and the overall size can be small. The battery system according to the present application employs the cell module described above, so the battery system has a small overall size and is beneficial to reduce costs.