IEEE 1725:2011 pdf free download

IEEE 1725:2011 pdf free download.IEEE Standard for Rechargeable Batteries for Cellular Telephones.
5.2.2 Electrode design criteria
Electrode design constituents for both the anode and the cathode shall be de.egned to assure pertwrnance. safety, and durability in thc designated application. Design criteria shall spcci material cOntent, purity. and environmental factors that will enable the electrode material to suppon thc manufacturing process and usage designated application.
5.2.3 Electrode capacity balance and electrode geometry
The charge capacity of the negotise electrode shall be greater than the positive electrode, The reversible capacity of the negatise electrode shall be greater by at least 0.1% plus process iolerance
The active area of the negative electrode shall completely cover the active areas of the positise electrode. The negative electrode shall be at least 0.1 mm wider (plus process margin) than the positive electrode on top and bottom at’ the cell unless process capahility’stahility is demonstrated to be less than 0.1 mm.
5.2.4 Electrode tabs (connection to cell terminals)
The manufacturer/supplier shall establish optimal esposed tab length and tab overhang A single tab shall not overhang both sides of the electrodes. Figure 5(a) and Figure 5(b) illustrate this principal.
5.2.5 Tab insulation
This subclause includes requirements tar lab insulation,
5.2.5.1 ApplIcation of Insulation
The tab that has the opposite polarity as the enclosure shall be insulated where it exits the electrode assembly. Insulation shall continue until it reaches the point of attachment to the terminal One embodiment of this principal is illustrated in Figure 5(c). Insulation may be accomplished through one or more insulating schemes. If a tab is located where there is only a one-layer separator to isolate the opposite electrode, additional insulation shall be used, which may be additional layers of separator material or tape.
5.2.5.2 Insulation characteristics
Insulation material shall have elcctrochcmical. chemical, mechanical and thermal stability, and shall have good adhesion and puncture strength, over the temperature range. -40 °C to ISO °C.
5.2.6 Cell vent mechanism
Cells shall be designed to include a consistent vent design or mechanism. For example. Fmil. edge, seam, or score.
5.2.6.1 Retention of cell contents
The vent mechanism shall be designed to minimize projectiles and maximize retention of cell contents.
When subjected to this test, no pan of an exploding cell shall penetrate the wire screen such that some or all of the cell protrudes through the screen.
5.2.7 Overcurrent protection device
The manufacturer/supplier may employ an overcurrent protector Isuch as a positive temperature coefficient resistor (PTC) resistor or other protective measure] integrated or built into each cell to protect from hazards in the event of external short circuit andior overcharge. If the cells are qualified per this standard using a PTC resistor or other protective measure. it shall be included in the cells used in the battery pack design and manufacture.
5.2.8 MaxImum recommended voltage
The cell manufacturer shall peoidc a recommended maximum voltage for the appropriate pack overvoltage protection function.
5.3 General manufacturing considerations
5.3.1 Materials specifications
Materials specifications shall be developed to identify and limit impurities to levels below critical limits.
5.3.2 Impurity avoidance
All undesirable impurities in materials should be identified, specified. reduced to acceptable levels. and controlled throughout the manufacturing process.
5.3.3 Cleanliness of manufacturing operations
In the manufacturing environment, management of temperature. humidity, and impurity levels shall he specified. controlled, and monitored. Also, environmental management of materials, before and after the manufacturing process, shall be specified and monitored. The introduction of metal contamination from equipment or process shall be prevented.