First of all! Constant current and constant voltage charging only considers the current as constant during the constant current phase. In fact, the current will change as the battery voltage increases, but the amount of change is not large.
Since the charger has MOS or diodes to step down or step up the voltage, the output voltage of the charger will fluctuate with the voltage regulation value as the battery voltage changes. The inductance and energy storage capacity of the charger are high, and the energy required by the battery does not change, causing the current to change. Usually the current increases a little before a constant voltage.
This is exactly what I saw in my experiments. It's best to see if it's like that yourself. If there are any differences, you can share them with us! eh eh ! ! ! !
The standard charging method for thes lithium batteries is CCCV, with constant current at the beginning and constant voltage at the later stage, what you call constant current. However, constant current charging is slower than pulse charging. .Common loaders These are all CCCV methods. Nokia mobile phones and cradle chargers and 1879 chips are all pulse methods, which are faster~~To be honest, there is no right or wrong difference between the two. application and charging mechanism. CCCV is the standard, pulse method. This is a newer charging method when charging by CCCV, you don't need to pay too much attention to battery capacity selection. The rate is less than 1C. However, the pulse is different, because the pulse charging current fluctuates, charging a small battery or small capacity. For a failed battery, the maximum current may bepass 1C or more, causing the battery to heat up. For old batteries, the CCCV method is easy to lose voltage after being fully charged, while the pulse method is better and faster. However, batteries with large internal resistance may heat up, so choose for yourself ~~ Actually the lifespan of lithium batteries. depends more on it, the charge cut-off voltage and the discharge cut-off voltage ~~~