Embodiments of the present application provide a battery, an electrical device, and a method and apparatus for preparing a battery. The battery comprises: a battery cell; a box; and a partition assembly, which is used for partitioning the box into a first storage section and a second storage section. The first storage section is used to store an electrical component. The second storage section is used to store the battery cell. A communication unit is formed in the partition assembly. The electrical component and the battery cell are electrically connected via a connection component. The connection component penetrates into the communication unit. The partition assembly has a first partition component and a second partition component that are connected to each other. The communication unit is formed by means of assembling the first partition component and the second partition component. When the battery cell is damaged and ejects a high-temperature and high-pressure discharge, the partition assembly is used to block the discharge, which prevents the electrical component from being affected, and increases the safety of the battery. By means of assembling the first partition component and the second partition component, the assembling performance of the entire box may be improved, and the productivity is increased.