IEC 62973-4 pdf – Railway applications – Rolling stock – Batteries for auxiliary power supply systems – Part 4: Secondary sealed nickel-metal hydride batteries

IEC 62973-4 pdf – Railway applications – Rolling stock – Batteries for auxiliary power supply systems – Part 4: Secondary sealed nickel-metal hydride batteries
1 Scope
This part of lEC 62973 applies to secondary sealed nickel-metal hydride battery technologiesfor auxiliary power supply systems used on rolling stock.
This document specifies the requirements of the characteristics and tests for the sealednickel-metal hydride cells and supplements lEC 62973-1 which applies to any rolling stocktypes (e.g. light rail vehicles，tramways,streetcars，metros,commuter trains,regional trains,high speed trains,locomotives,etc.). Unless otherwise specified,the requirements ofIEC62973-1 apply.
This document also specifies the requirements of the interface between the batteries and thebattery chargers.
2Normative references
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document. For dated references,only the editioncited applies.For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60051 (all parts)，Direct acting indicatinganalogue electrical measuring instruments andtheir accessories
IEC 60077-1，Railway applications – Electric equipment for rolling stock – Part 1: Generalservice conditions and general rules
IEC 62485-2，Safety requirements for secondary batteries and battery installations – Part 2:Stationary batteries
IEC 62675 , Secondary cells and batteries containing alkaline or other non-acid electrolytes -Sealed nickel-metal hydride prismatic rechargeable single cells
IEC 62902:2019, Secondary cells and batteries – Marking symbols for identification of theirchemistry
IEC 62973-1:2018,Railway applications – Rolling stock – Batteries for auxiliary power supplysystems – Part 1: General requirements
IEC 63115-1:2020， Secondary cells and batteries containingalkaline or other non-acidelectrolytes- Sealed nickel-metal hydride cells and batteries for use in industrial applications
– Part i: Performance
IEC 63115-2:2021, Secondary cells and batteries containing alkaline or other non-acidelectrolytes – Sealed nickel-metal hydride cells and batteries for use in industrial applications – Part 2: Safety
3Terms，definitions and abbreviated terms3.1 Terms and definitions
ISO and lIEC maintain terminological databases for use in standardization at the followingaddresses:
.IEC Electropedia: available at http://www.electropedia.orgl;
.Iso Online browsing platform: available at http://www.iso.orglobp.NOTE All typical battery related descriptions are defined in lEc 60050-482.
3.1.1
nickel-metal hydride batteryNi-MH battery
secondary battery with an electrolyte of aqueous potassium hydroxide，a positive electrodecontaining nickel as nickel hydroxide and a negative electrode of hydrogen in the form of ametal hydride
Note 1 to entry: Nickel-metal hydride battery contains assembly of sealed cells.
[SOURCE: IEC 60050-482;2004,482-05-08, modified – Abbreviation and Note 1 to entry havebeen added.]
3.1.2
cell
basic functional unit, consisting of an assembly of electrodes, electrolyte , container, terminals
and usually separators，that is a source of electric energy obtained by direct conversion ofchemical energy
Note 1 to entry: ln this document cell means secondary sealed nickel-metal hydride cell,
[SOURCE: IEC 60050-482:2004,482-01-01, modified- Note 1 to entry has been replaced.]
3.1.3
sealed cell
cell which remains closed and does not release either gas or liquid when operated within thelimits specified by the manufacturer
Note 1 to entry: A sealed cell may be equipped with a safety device to prevent a dangerously high internalpressure and is designed to operate during its life in its original sealed state.
[SOURCE: IEC 60050-482:2004,482-05-17]
3.1.4
secondary cell
cell which is designed to be electrically recharged
Note 1 to entry: The recharge is accomplished by way of a reversible chemical reaction.[SOURCE: lEC 60050-482:2004,482-01-03]
3.1.5
battery module
group of cells connected together either in series and/or parallel configuration with or withoutprotective devices (e.g. fuse or PTC) and monitoring circuitry