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What is the reason for the heating of lithium battery pack during charging? Is it normal for lithium iron phosphate battery packs to generate heat during charging? What is the reason behind this? The heating of a lithium battery pack during charging can be simply explained as the generation of heat through chemical reactions. Heating of a lithium battery is a normal phenomenon, which is a process of energy conversion where a portion of electrical energy is converted into thermal energy. Lithium iron batteries may be caused by battery malfunctions, such as aging, increased internal resistance, dried electrolyte, internal short circuits, etc. This article will discuss in detail the reasons for the heating of lithium battery packs.

What is the phenomenon of lithium battery pack heating?

Heating of lithium iron phosphate battery packs is a common phenomenon in daily life, often occurring in wireless household appliances such as mobile phones and laptops that use lithium batteries as power sources. Due to the chemical reaction inside the battery during discharge, a large amount of heat energy is generated, causing the temperature of the lithium iron battery to rise. When we touch it with our hands, we will feel the temperature, which is a common phenomenon in most lithium batteries.

What is the reason for the heating of lithium battery pack during charging?

The heating of lithium battery packs during charging may be due to the battery's own malfunction, which may be caused by aging, increased internal resistance, dried electrolyte, internal short circuits, etc. It may also be a problem with the lithium battery charger. Generally, chargers do not have pulse function, let alone negative pulse polarization elimination function. These chargers usually cannot maintain constant voltage in the later stage of charging, resulting in a large amount of gas evolution, water loss, and heating of the battery.

Generally speaking, there are four reasons for the heating of lithium battery packs during charging:

1. Lithium batteries and chargers are not compatible, and little consideration is given to the matching of voltage and current between chargers and lithium battery packs. If these mismatched chargers are used for charging, it will cause the electric vehicle battery to overheat during charging;

2. In case of battery failure or severe dehydration, the battery should be checked or refilled. Batteries that have been in use for more than 15 months need to be maintained and refilled with water;

The charging environment temperature for lithium battery packs is too high, and the charging site should avoid high temperature environments and have good ventilation.

4. Improper charging and non-standard electricity are common causes of heat generation in lithium battery packs.

In summary, both overcharging and excessive discharging are prone to explosions. In short, improper use can easily lead to explosions.

What are the hazards of lithium battery pack heating?

1. Prolonged excessive heating of iron lithium batteries can cause an increase in internal component temperature, affecting the normal operation of the components;

2. Long term heating of lithium batteries can increase the heat of the battery itself. If it is a sealed battery, the internal air will expand violently, causing the battery to protrude outward and, in severe cases, causing the battery to explode;

3. Long term excessive heating of lithium battery packs can accelerate the aging process of the product itself and shorten its lifespan.

How to prevent lithium battery pack from heating up during charging?

1. It is not advisable to use a high current charger for too long, as charging for too long can damage the lithium battery and generate heat.

2. It is best to use original lithium battery chargers, and choose products with guaranteed quality or good quality reputation.

If you are not in a hurry to use it, it is recommended to take out the lithium battery and charge it, so as not to cause the battery to heat up.

When the temperature of the lithium battery pack rises and you feel a little hot, you should immediately stop using it or replace it with a new battery. If you are charging, unplug the charger immediately.

What should I do if a lithium battery cannot be charged after excessive discharge?

Firstly, turn on the machine and remove the internal battery. If the voltage is normal, it indicates that the lithium battery pack is not damaged. The reason may be due to the charging control link of the lithium battery pack charger, which prevents the over discharged lithium battery from charging. So I tried to apply 5V DC directly to both ends of the battery's lead wire for forced charging. At the beginning, the charging current was very high, but over time, the current gradually decreased and stabilized. After charging for 6 hours, reinstall the battery back to the original machine's wiring and start playing normally. A few days later, when the battery runs low, the original charger can charge normally again.

Summary: In recent years, lithium iron phosphate battery packs have been widely used, such as in data centers, communication base stations, medical equipment, new energy vehicles, special modified vehicles, and so on. When a lithium battery pack is running low, suddenly entering high current can cause damage to the battery. Due to the high current and rapid heating, the battery's lifespan will be shortened. So, it is necessary to use the correct method to charge the lithium battery pack in daily life.

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