AS IEC 62619:2017 pdf download – Secondary cells and batteries containing alkaline or other non-acid electrolytes- Safety requirements for secondary lithium cells and batteries, for use in industrial applications.
5 General safety considerations
5.1 General
The safety of lithium secondary cells and batteries requires the consideration of two sets of applied conditions:
a) intended use;
b) reasonably foreseeable misuse.
Cells and batteries shall be so designed and constructed that they are safe under conditions of both intended use and reasonably foreseeable misuse. It may also be expected that cells and batteries subjected to intended use shall not only be safe but shall continue to be functional in all respects.
It is expected that cells or batteries subjected to misuse may fail to function. However, even if such a situation occurs, they shall not present any significant hazards.
Potential hazards which are the subject of this document are:
a) fire,
b) burst/explosion,
c) critical electrical short-circuit due to leakage of cell electrolyte,
d) venting which continuously vents out flammable gases,
e) rupture of the casing of cell, module, battery pack, and battery system with exposure of internal components.
Conformity with 5.1 to 5.6 is checked by the tests of Clauses 6, 7, and 8, and in accordance with the appropriate standard (see Clause 2).
5.2 Insulation and wiring
Wiring and its insulation shall be sufficient to withstand the maximum anticipated voltage, current, temperature, altitude and humidity requirements. The design of wiring shall be such that adequate clearances and creepage distances are maintained between conductors. The mechanical integrity of the whole battery system (cell/module/BMS) and their connections shall be sufficient to accommodate conditions of reasonably foreseeable misuse.
5.3 Venting
The casing of a cell, module, battery pack, and battery system shall incorporate a pressure relief function that will preclude rupture or explosion. If encapsulation is used to support cells within an outer case, the type of encapsulant and the method of encapsulation shall neither cause the battery system to overheat during normal operation nor inhibit pressure relief.
5.4 Temperature/voltage/current management
The design of batteries shall be such that abnormal temperature-rise conditions are prevented. Battery systems shall be designed within voltage, current, and temperature limits specified by the cell manufacturer. Battery systems shall be provided with specifications and charging instructions for equipment manufacturers so that associated chargers are designed to maintain charging within the voltage, current and temperature limits specified.
NOTE Where applicable, means can be provided to limit current to safe levels during charge and discharge.
5.5 Terminal contacts of the battery pack and/or battery system
Terminals shall have clear polarity marking(s) on the external surface of the battery pack or battery system.
5,6 Ass.mbly of cells, modules, or battery packs into battery systems
56.1 General
The assembly of cells, modules, or battery packs to constitute the battery system shall respect the following rules in order to support adequate mitigation of risks into the battery system
• Each battery system shall have an independent control and protectn method(s).
• The cell manufacturer shall provide recommendations about current, voltage and temperature limits so that the battery system manufacturerFdesigner may ensure proper design and assembly.
• Batteries that are designed for the selective discharging of a portion of their series connected cells shall incorporate separate circuitry to prevent the cell reversal caused by uneven dischargng.
• Protective Circuit components should be added as appropriate and consideration given to the end-device application
5.6.2 Battery system design
The voltage control function of the battery system design shall ensure that the voltage of each cell or cell block shall not exceed the upper limit of the charging voltage specified by the manufacturer of the cells, except in the case where the stationary application dev,ces or motive application devices provide an equivalent voltage control function
The following should be considered at the battery system level and by the battery manufacturer:
For the battery system which has series-connected plural single cells, modules or battery packs, it is recommended thaI the voltages of any one of the single cells or cell blocks do not exceed the upper limit of the charging voltage, specified by the cell manufacturer, by monitoring the voltage of every single cell or cell block.
57 OperatIng regIon of lIthIum cells and battery systems for safe use
The cell manufacturer shall specify the cell operating region The battery manufacturer shall design the battery system to comply with the cell operating region. Determination of the cell operating region Is explained in Annex A