What are the dangers of charging cell phone lithium batteries for too long?

Introduction What are the dangers of charging a cell phone's lithium battery for too long? If you want to ask questions about charging cell phone lithium battery, please see below: How to charge cell phone lithium battery correctly? any questions recently?

What are the dangers of charging cell phone lithium batteries for too long?

If you want to ask about charging mobile phone battery, please see below:

How to properly charge mobile phone lithium battery

It There have been many readers recently. Call or write to ask how to properly charge a cell phone lithium battery. It seems that this question is one that everyone is more concerned about. I'll answer it here: The first three times of charging a cell phone's lithium battery. How long should the newly purchased mobile phone last? Many friends think that you need to charge it for 12-14 hours in order to activate the standby battery. Many marketers also say the same thing when consumers buy the phone. In fact, there is no definitive conclusion on this issue, and I personally believe that this statement lacks scientific basis. In factt, the first three charging times and subsequent charging times are the same, and 3 to 4 hours is enough. Firstly, everyone knows that when a lithium battery is overcharged, overdischarged or the charging or discharging current is too large, it will greatly damage the lifespan and capacity of the battery, and even lead to deformation or battery explosion, usually indoors. lithium battery Electronic circuits are put in place to protect the batteries. When the battery is overcharged, over-discharged, or has excessive current, it cuts off the connection to the outside world. Just like what some friends reported: when the phone is on and charging, an incoming call will cause the auto shutdown issue. In other words, during the initial battery charging phase, the voltage is low and when a call comes in, the phone must maintain some power.e to ring. When the voltage is low, the battery current increases. The excessive current will cause the battery protection circuit to operate and cut off the connection between the battery and the outside, causing the cell phone to automatically shut down. Second, in order to improve the charging efficiency, the lithium battery is first charged with large current and constant current to 90% of the capacity, and the battery voltage is 4.2 V, which then takes about 2 hours; constant voltage and a small current until the battery is fully charged. It takes about half an hour for the internal protection circuit to work. Considering the individual differences of each battery and charger, it is appropriate to charge the lithium battery for 3-4 hours. hours. For example, I tested the Siemens 6618 battery charging process: after 0.5 hours of charging, the battery powerreached 50%, and "565F Battery" was displayed after 1 hour of charging, the battery power reached 80%, and ""8667 Battery" was displayed; after 2 hours of charging, the power of the battery has reached 100%, "A667 Battery" is displayed Taking into account the power display error of the mobile phone and other factors, it can be charged for another 1.5 hours. Another thing you need to pay attention to is that lithium batteries will enter a dormant state if left unused for a long time and need to be activated before normal use. Generally, it can be activated after 3-5 charging cycles. and discharge According to the first two reasons, it is useless to expect a dormant lithium battery to be activated by prolonged charging Because once the battery is fully charged (about 2 to 4 hours), the circuit will. lithium battery protection has already been activatedve and cut off the external power supply. Due to the role of the protection circuit, although long-term charging is not harmful to lithium batteries, activating the protection circuit will consume the power of the battery core. If the protection circuit loses its function, it will damage the battery. at least, damage the cell phone in the worst case, and imagine even more serious consequences. Therefore, considering the individual differences between mobile phones, lithium batteries and chargers, the first three charges and subsequent charges are the same and only take 3-4 hours. Recently, many readers and friends have called or written to ask how to charge the mobile phone. The issue of lithium battery charging seems to be one that everyone is more concerned about. I will answer it here: how long does it take to charge the lithium battery of a new cell phone?really bought the first three times? Many friends think that you need to charge it for 12-14 hours in order to activate the standby battery. Many marketers also say the same thing when consumers buy the phone. In fact, there is no definitive conclusion on this issue, and I personally believe that this statement lacks scientific basis. In fact, the first three charge times and subsequent charges are the same, and 3-4 hours is enough. Firstly, everyone knows that when a lithium battery is overcharged, overdischarged or the charging or discharging current is too large, it will greatly damage the lifespan and capacity of the battery, and even lead to deformation or battery explosion, usually indoors. lithium battery Electronic circuits are put in place to protect the batteries. When the battery is overcharged, over dischargedor presents excessive current, it cuts the connection with the outside world. Just like what some friends reported: when the phone is on and charging, an incoming call will cause the auto shutdown issue. In other words, during the initial battery charging phase, the voltage is low and when a call comes in, the phone must maintain some power to ring. When the voltage is low, the battery current increases. The excessive current will cause the battery protection circuit to operate and cut off the connection between the battery and the outside, causing the cell phone to automatically shut down. Second, in order to improve the charging efficiency, the lithium battery is first charged with large current and constant current to 90% of the capacity, and the battery voltage is 4.2 V, which then takes about 2 hours; a constant voltage and a small current until quntil the battery is fully charged. It takes about half an hour for the internal protection circuit to work. Considering the individual differences of each battery and charger, it is appropriate to charge the lithium battery for 3-4 hours. hours.

Taking into account the power display error of the mobile phone and other factors, when the charger shows green light, it can be charged for another 1.5 hours. Another thing you need to pay attention to is that lithium batteries will enter a dormant state if left unused for a long time and need to be activated before normal use. Generally, it can be activated after 3-5 charge and discharge cycles. According to the first two reasons, there is no point in expecting a dormant lithium battery to be activated by prolonged charging. Because once the battery is fully charged (approximately 2 to 4 hoursures), the lithium battery protection circuit has already activated and cut off the external power supply. Due to the role of the protection circuit, although long-term charging is not harmful to lithium batteries, activating the protection circuit will consume the power of the battery core. If the protection circuit loses its function, it will damage the battery. at least, damage the cell phone in the worst case, and imagine even more serious consequences. Therefore, considering the individual differences between mobile phones, lithium batteries and chargers, the first three charges and subsequent charges are the same and only take 3-4 hours.

When charging a lithium battery, it is first charged with a constant current, and when it reaches the termination voltage, it switches to constant voltage charging. The load requirements are very high and the accuracyof the termination voltage. must be insured to less than 1%. For example, 4.2V is ±0.042V from Inside. Severe overloading may cause permanent damage. Therefore, a 4.2V charger cannot be used on a 4.1V battery.

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