A security architecture, a battery, and a motor vehicle that has a corresponding battery are configured to be used to combine battery packs of a lower security integrity level into a battery system that has a higher security integrity level. The security architecture is for at least two batteries and each battery includes at least one electrochemical cell. The at least two batteries are each combined with at least one data processing unit to form a respective module. The security architecture is configured such that input signals of at least one second module are processed by the at least one data processing unit of at least one first module.