What does balancing mean about supercapacitor?2019-05-27 [12:32]
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What does balancing mean about supercapacitor?
Voltage variations among supercapacitor cells may occur depending on each cell’s characteristics and they are controlled in VINATech modules. Voltage variation amongst cells could occur in a module depending on each Supercapacitor cell's characteristics. The variable needs to be reduced to as low as possible for the best performance. The function of reducing it is called balancing. Vinatech’s special balancing technology is applied to all Vinatech’s modules in order to make their lifetime as long as possible and utilize their capacitance as much as possible. Whether a user needs balancing or not depends on the charging condition. VINATech modules are balanced from matched products direct from the production line.
Passive vs Active balancing circuit
Balancing is not necessary if the maximum charging voltage leaves an available margin of 0.2V. For example, a maximum charging voltage for a 2.7V cell is 2.5V, then 0.2V is left vacant, so it doesn't need to be balanced.
However, if an application charge fully to maximum voltage like 2.7V or 3.0V, then it should be balanced.
Active balancing takes up more PCB space, so because of space constraint, we usually recommend a passive balancing. Active balancing is more costly (x2 in case and has energy needs too). If the user doesn’t want passive balancing, then identify the required charging condition. If the charging condition leaves enough voltage margin over 2.0v, then the balancing is not necessary. With enough voltage margin, the user can use a supercapacitor module without balancing as it will lead to the shortening of lifetime of the Supercapacitor.
Passive balancing circuit voltage is directly proportionate to the charging and discharging voltage as it’s distributed to each cell of supercapacitor equally. Passive balancing requires less space constraints, but high current may occur a decrease of capacitance and current consumption may result in increased leakage current.
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