Lithium iron phosphate and ternary lithium ion batteries are two common types of lithium ion batteries at present. They are widely used in electric vehicles, energy storage systems and other fields. However, when these two batteries are heated by high temperature during use, their thermal runaway behavior may cause safety problems. This article will discuss the thermal runaway behavior of lithium iron phosphate and ternary lithium ion batteries under heating in order to better understand and prevent potential safety risks.

1. Thermal runaway behavior of lithium iron phosphate battery

1.1 Characteristics of thermal runaway

• lithium iron phosphate battery has high thermal stability, but in extreme cases, such as overcharge and external damage, thermal runaway may still occur. When the heat is out of control, too much heat is generated inside the battery, which leads to the increase of battery temperature and pressure, which may lead to serious consequences such as battery explosion and fire.

1.2 Preventive Measures

• to prevent the thermal runaway of lithium iron phosphate batteries, measures such as controlling the charging current, using battery Protection Board, and avoiding excessive discharge can be taken to ensure that the batteries operate within a safe range.

2. Thermal runaway behavior of ternary lithium ion batteries

2.1 Characteristics of thermal runaway

• Ternary lithium ion battery has high energy density and long cycle life, but under the conditions of excessive charge and discharge, external short circuit, etc., thermal runaway may also occur. When the heat is out of control, too much heat will be generated inside the battery, which may lead to battery temperature rise, gas release, even Explosion, fire and other accidents.

2.2 preventive measures

• aiming at the thermal runaway behavior of ternary lithium ion batteries, measures such as limiting charging temperature, using temperature control system and installing safety protection devices can be taken to ensure the safety performance of batteries in high temperature environment.

3. Comparison and analysis

3.1 thermal runaway behavior differences

• compared with ternary lithium batteries, lithium iron phosphate batteries show better thermal stability at high temperature, but thermal runaway may still occur in extreme cases. However, ternary lithium batteries may be more prone to thermal runaway at high temperature.

3.2 Differences in preventive measures

• for lithium iron phosphate battery different from the thermal runaway behavior of ternary lithium batteries, preventive measures are different. Corresponding measures should be taken according to the characteristics of different battery types to ensure the safety performance of batteries in high temperature environment.

4. Countermeasures and suggestions

4.1 strictly control the charge and discharge temperature

• for lithium iron phosphate battery and ternary lithium battery, the charge and discharge temperature should be strictly controlled to avoid exceeding the safety range and ensure the stable operation of the battery.

4.2 use temperature control system

• A temperature control system is installed in the battery system to monitor the change of battery temperature in time and take corresponding measures to ensure the safe operation of the battery.

Lithium iron phosphate battery and ternary lithium ion battery may have the risk of thermal runaway at high temperature, and consumers and manufacturers should attach great importance to it. By understanding the difference between the thermal runaway behavior characteristics and preventive measures of the two batteries at high temperature, safety measures can be better formulated to ensure the safe operation of the batteries in high temperature environment.