Lithium battery charging process, a long time trickle charge on lithium batteries have an impact? The increasingly widespread use of lithium batteries makes lithium battery charging methods are of great concern. For different lithium batteries, usually have different lithium battery charging methods, which is the reason why we can not fully grasp the lithium battery charging method in a short time. So how is the lithium battery charging? Long time trickle charging on lithium batteries have an impact? Here's what you need to know.
Trickle charge is the term NiMH batteries, the same applies to lithium batteries, the charging process of lithium batteries can be divided into four stages: trickle charging, constant current charging, constant voltage charging and charging termination. Constant-voltage stage is the so-called trickle charge, the power is generally around 80%, you can enter the constant-voltage mode, at which time the charging speed will begin to slow down until the battery is full.
Lithium battery charging process
Stage 1: Trickle charge - trickle charge is used to pre-charge the fully discharged battery cell, and trickle charge is used when the battery voltage is below about 3V. The trickle charge current is one-tenth of the constant current charge current, i.e. 0.1c.
Stage 2: constant current charging - that is, constant charging current, which is often referred to as CC mode, constant current charging we need constant current, generally take the charging current between 0.2C-1C, pay attention not to exceed 1.5C, otherwise there will be greater damage to the battery; this process, the voltage of the lithium battery will continue to rise, until the battery voltage reaches 4.2V after entering the constant voltage charging stage.
Stage 3: Constant voltage charging - When the battery voltage rises to 4.2V, the constant current charging ends and starts the constant voltage charging stage, for the best performance, the voltage regulation tolerance should be better than +1%.
Phase 4: Charge termination - There are two typical methods of charge termination: using the minimum charge current judgment or using a timer, the minimum current method monitors the charge current during the constant voltage charging phase and terminates the charge when the charge current decreases to the range of 0.02C to 0.07C; the second method is timed from the beginning of the constant voltage charging phase and continues charging for two hours before terminating the charging process.
Does a long trickle charge have an effect on Li-ion batteries?
After two stages of fast charging and continuous charging, Li-ion batteries need to be trickle charged to fill up the remaining capacity, and trickle charging usually takes a period of time to complete all three stages to really reach a good state of saturation. At present, the charger can not control the trickle charging process of lithium batteries, trickle charging time is too long will have the risk of explosion, trickle charging time is too short, the lithium battery capacity is not full and shorten the use of lithium batteries.
Trickle charge is used to make up for the loss of capacity due to self-discharge after the battery is fully charged, generally lithium batteries just bought into the charge for 12 hours, after the charger lights out the trickle charge time can not be disconnected. Trickle charge can charge the battery enough without harming the battery life, but the time spent with trickle charge is too long, so it is rarely used alone, but in combination with other charging methods.
Many battery manufacturers recommend against using trickle charging for long periods of time. With trickle charging, the charge rate will be very low and sometimes intermittent. When charging a battery, the best smart chargers can only make temporary changes in charge rate, but there is no continuous low-rate charging capability, and only one-tenth of the battery energy will not be harmed if trickle charging is done for a long time.
The above is an introduction to the lithium battery charging process and the impact of long time trickle charging on lithium batteries. The biggest advantage of trickle charging is that the charging rate is reduced before filling the phone, effectively reducing the occurrence of overcharging the phone, but usually when charging, it is not necessary to charge the phone as full as possible, but to eat less and more appropriate, there is time to charge, charge it and then use it.
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