Select a proper battery fuel gauge for your battery pack
6/18/2012 7:48 AM EDT
All kinds of rechargeable batteries are more and more popular in our life. Every mobile electronics devices and electrical equipments have their battery pack. Monitoring battery status is necessary and useful for end user.
How to monitor your battery remain capacity, in other words, how long does my battery keep working normally? There are three algorithms to measure the remain of your battery: “Voltage-Capacity-Curve Lookup”, “Current-Accumulating”and “Impedance-Track”method.
First is the “Voltage-Capacity-Curve Lookup” method, hereby we name it as VCL. This algorithms is the simple technology in all three ways. VCL is mornitoring the battery terminal voltage and comparing measured value with build-in fixed voltage-capacity table then give a result of relative remain capacity status. For different chemical battery type, the voltage-capacity curve is different. Further, even for a same battery pack, this curve will be different at higher or lower discharging current. So it is easy to understand why this method only get a gross or rough result. Generally, VCL battery monitor products have 10%~20% relative remain capacity tolerance.
As an example, BG1-XXXX is cited here.
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