IEEE 1625:2008 pdf free download

IEEE 1625:2008 pdf free download.IEEE Standard for Rechargeable Batteries for Multi-Cell Mobile Computing Devices.
5.2.2.5 Shrinkage allowance
The area and width of the separator shall take into consideration allowances for certain separator shrinkage characteristics. Thc separator/cell design shall maintain adequate coverage of clcctrodes to meet cell safety requirements. The cell manufacturer/supplier shall conduct a design analysis that includes one or more of the following: a FMEA. a fault tree analysis, empirical or destructive testing. or a cause-and-effect (fishbone) analysis for the separator to consider the allowances to reflect and compensate for a worst case tolerance analysis. This worst case tolerance analysis should prohibit hazards related to shrinkage. Such considerations shall include, but are not limited to, width, alignment, temperature, and any age-related changes in size. For example. the separator should extend beyond the positive electrode and the negative electrode, in all cases.
5.2.3 Electrode design criteria
1/lectrode design constituents for both the negative electrode (anode) and positive electrode (cathode) shall be designed for perfonnance. safety, and durability in the designated application. The cell manutIcturer.supphier shall conduct a design analysis that includes one or more of the following: a FMFA. a fault tree analysis. empirical or destructive testing, or a cause-and-effect (fishbone) analysis for the electrode design criteria that considers allowances to reflect and compensate for a worst case tolerance analysis. Design criteria shall specify material content, purity, and environmental factors, which will enable the electrode material to support the manufacturing process and usage in the end application.
5.2.4 Electrode capacity balance and electrode geometry
The cell design shall ensure that after formation the reversible charge capacity of the negative electrode [Q-reversible (N)] is greater than the reversible charge capacity of the positive electrode [Q.reversible (P)J. Allowance shall be made in the design to maintain the cell balance during the useful life of the cell. regardless of cell geometry and cell charge conditions (temperature. current density. etc.).
The active area of the negative electrode shall completely cover the active areas of the positive electrode. The electrode design shall maintain adequate coverage to meet cell reliability requirements. The cell manufacturer/supplier shall conduct a design analysis that includes one or more of the following: a FMEA, a fault tree analysis, empirical or destructive testing, or a cause-and-etTect (fishbonc) analysis for the electrode capacity balance and electrode geometry that considers allowances to reflect and compensate for a worst case tolerance analysis. This worst case tolerance analysis should prohibit hazards related to overlap. Such considerations shall include, but are not limited to, width, alignment, temperature. and any age-related changes in size.