This part of IEC 62973 applies to lithium-ion batteries for auxiliary power supply systems used on rolling stock. This document specifies the requirements of the characteristics and tests for the lithium-ion cells, and supplements IEC 62973-1 which is applied to any rolling stock types (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives, etc.).

Unless otherwise specified in this document, the requirements of IEC 62973-1 apply.

This document specifies the requirements of the interface between battery system including BMS and the converter.

This document is used in conjunction with generic IEC 62619 (safety requirements) and IEC 62620 (performance requirements) of lithium-ion cells and batteries used in industrial applications. This document specifies the requirements for railway rolling stock applications.

Such batteries for auxiliary power supply systems are also sometimes used for:
– occasional traction power for shunting in depot, or for rescue or emergency mode such as stop on third rail gaps;
– peak power shaving and engine starting.

If the nominal battery voltage exceeds the voltage specified in Table 1 of IEC 62973-1:2018, then IEC 62928 applies to the battery.