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IEEE1725-IEEE Datasheet(PDF) 2 Page - Littelfuse |
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2 / 8 page 2 c n I , e s u fl e tt i L 12 0 2 © Li-ion and Li-ion polymer chemistry has specic energy of 400Wh/L at 20°C, which is approximately two times the specic energy of NiMH (nickel metal hydride) and four times that of the old NiCd (nickel cadmium) chemistry. Li-ion chemistry also operates at higher voltages of 3.0–4.2V versus 1.0–1.2V for the older chemistries. The older chemistries had a moderate-to- high tolerance to over-charging events, whereas the newer Li-ion chemistry has a very low tolerance to over-charging There are a variety of reasons for battery pack failures: poorly designed cells, lack of over-current/over-voltage protection, lack of thermal protection, no tolerance to swelling, no venting methods for gas, and use in high temperature environments. Over-discharge and over-charge are two externally created events that can cause problems in LIBs. During over-discharge, if the cell voltage drops lower than approximately 1.5V, gas will be produced at the anode. When voltage drops to less than 1V, copper from the current collector dissolves, causing internal shorting of the cell. Therefore, under-voltage protection is required and is provided by the battery protection IC. Over-charge creates gassing and heat buildup at the cathode when cell voltage reaches approximately 4.6V. Although cylindrical cells have internal protection from pressure, activated CIDs (current interrupt devices) and internal PTCs (positive temperature coefcient discs that increase in resistance when heated), Li-polymer cells do not have internal CIDs and PTCs. External over- voltage, over-gas, and over-temperature protection is especially critical for Li-polymer cells Li-ion Battery Safety Standards Several safety agency standards apply to lithium-ion battery packs. These are the key standards that govern the performance, safety testing, and transportation of lithium-ion battery packs: ● UL 1642-2005, Standard for Lithium Batteries—Requirements are intended to reduce the risk of re or explosion when lithium batteries are used in a product. ● IEC 62133:2002, Secondary cells and batteries containing alkaline or other non-acid electrolytes—Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications. ● IEC 62281, Safety of primary and secondary lithium cells and batteries during transport—These requirements cover portable primary (non-rechargeable) and secondary (rechargeable) batteries for use as power sources in products. ● UL 2054, Standard for Household and Commercial Batteries—These requirements are intended to reduce the risk of re or explosion when batteries are used in a product. ● UN/DOT (Dept of Transportation) Manual of Tests and Criteria 4th Revised Edition Lithium Battery Testing Requirements – Sec 38.3. ● IEEE 1625 - IEEE Standard for Rechargeable Batteries for Multi-Cell Mobile Computing Devices ● IEEE 1725 - IEEE Standard for Rechargeable Batteries for Cellular Telephones ● IEC/UL 60950-1, Information Technology Equipment Safety—Limited Power Source, Sec 2.5, Table 2B, requirements to limit current to less than 8A within 5sec ; this specication would apply to most battery systems used for notebook computers, cell phones, and tablet devices. These standards guide manufacturers/suppliers in planning and implementing the controls for the design and manufacture of lithium-ion (Li-ion) and lithium-ion polymer (Li-ion polymer) rechargeable battery packs. The typical safety-related tests in these standards, which involve the use of external and internal battery pack protection, will include the following (standards will each have their own specic requirements and this is just a brief summary of the types of tests conducted): Application Note: Use of Low Resistivity Surface Mount PPTC in Li-ion Polymer Battery Packs |
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