ER (Lithium Thionyl Chloride Battery)
This battery is ideal for such long-term applications as power for electronic devices and electric power, water, and gas meters, and especially as a backup power source for memory ICs.
High 3.6-V voltage
The lithium thionyl chloride battery achieves a high voltage of 3.6 V.
Flat discharge characteristics
The change of internal resistance during discharge is minimal, allowing for flat discharge voltage until end of discharge life.
High energy density
Provides high energy density of 970m Wh/cm3 with discharge current of 100 µA (ER6 type).
Wide usable temperature range
Can be used over a wide temperature range : - 55 deg. C to +85 deg. C (please consult with Maxell, if using in temperatures of -40 deg. C or less).
Superior long-term reliability
The extremely low self-discharge, together with the use of a hermetic seal, allows for stable use over long periods.
Principle and Reactions
The lithium thionyl chloride battery uses liquid thionyl chloride (SOCL2) as its positive active material, and lithium (Li) as its negative active material. The reactions of the battery are shown below.
|Positive reaction :||2SOCl2+4Li++4e- → 4LiCl+S+SO2|
|Negative reaction :||Li → Li++e-|
|Total reaction :||2SOCl2+4Li → 4LiCl+S+SO2|
Minimum Transient Voltage
The lithium thionyl chloride battery has remarkably lower self-discharge when compared with conventional batteries. This is because a lithium chloride membrane is formed over the negative lithium surface, blocking reaction with the positive material. When first discharging after storage, resistance from this lithium chloride membrane may temporarily reduce the voltage at the initiation of discharge. The lowest voltage at this time is called minimum transient voltage, and the lower the temperature, and the larger the discharge current, the lower the voltage will be. Because minimum transient voltage is greatly influenced by storage time and conditions, it is necessary to take this into sufficient consideration when designing a device.
The figure above shows minimum transient voltage using a fresh battery.
Relationship between Discharge Load and Operating Voltage
The operating voltage of a battery falls as the discharge load increases and temperature falls. In the case of initial use, an electric potential of at least 3 V will be maintained even at temperatures of -40 deg. C at discharge of less than 1 mA.
The lithium thionyl chloride battery is made from chemically stable inorganic materials. Additionally, a sealing method employing a laser-welded seal structure and hermetic seal hinders the admittance of outside air. These features provide superior storage characteristics, holding down self-discharge to no more than 1% of capacity per year at normal temperatures.
- -OA Machines (Fax, Copiers, Printers)
- -Desktop PCs
- -Medical Instruments, Cash Registers
- -FA Instruments (Measuring Instruments, Onboard Microcomputers, Sensors)
- -Electronic Meters (Gas, Water, Electricity)
- -ETC (Electronic Toll Collection System)
*1 Dimensions and weight are for the battery itself, but may vary depending on the shape of terminals or other factors.
*2 Nominal capacity indicates duration until the voltage drops down to 3.0V when discharged at a nominal discharge current at 20 deg. C.
UL Recognized Components
The lithium thionyl chloride battery is a UL (Underwriters Laboratories Inc.) recognized component. (Technician replaceable)
Recognized models: ER18/50, ER17/50, ER6, ER6C, ER17/33, ER3, ER3S
Certification number: MH12568
About Maxell ER batteries
Maxell ER (lithium thionyl chloride) batteries are available only for quipment manufacturers as a built-in part. Therefore, Maxell does not supply these batteries for replacement directly to users of equipment with these batteries. When built-in ER batteries need to be replaced, please contact your equipment manufacturer. If you are planning to use Maxell ER batteries in your equipment as a built-in part, please contact Maxell.
Maxell ER batteries are not general use products. Improper usage may cause not only poor performance but it may also damage the equipment and/or the human body. Therefore, Maxell sells ER batteries only after confirmation of the usage conditions and scope of warranty within the specifications sheet. Maxell does not guarantee the performance and quality of batteries purchased without agreement of the specifications sheet.
Counterfeit batteries on which illegally bearing our trademark "maxell" are offered in the market. Please do not purchase or use such unauthorized batteries for replacement or any other purposes.
-Data and dimensions are not guaranteed. For further details, please contact us at your nearest Maxell office.
-Contents on this website are subject to change without notice.