A coolant distribution interface for a battery system includes a battery module housing comprising a coolant channel, and at least one mounting portion located at an entrance of the coolant channel, wherein the mounting portion comprises a first sealing section and a second sealing section; a matching housing comprising a matching coolant channel, and at least one matching mounting portion located at an entrance of the matching coolant channel, wherein the matching mounting portion comprises a first matching sealing section and a second matching sealing section; a joint coolant channel configured to connect the coolant channel of the mounting portion and the matching coolant channel of the matching mounting portion; a shared sealing element locating between the second sealing section and the second matching sealing section; a channel sealing element sealing the first sealing section and first matching sealing section against the joint coolant channel; a security chamber configured to form by the mounting portion, the matching mounting portion, the shared sealing element and channel sealing element; and a testing channel connecting the security chamber with an outside of the battery module housing and the matching housing, wherein the test channel is penetrated at least one of the battery module housing and the matching housing.