Keyword search: battery plant ,  lithium battery factory ,  power bank works ,  lifepo4 battery mill ,  Pallet Trucks LiFePO4 Battery,  LiFePO4 Pallet Trucks Battery,  Lithium Pallet Trucks Battery, 

Safety Evaluation and Testing Methods of Lithium Batteries. In recent years, safety accidents of lithium batteries in electric vehicle power batteries have occurred frequently. How to evaluate and test the safety of lithium batteries and better prevent the occurrence of lithium - battery safety accidents has always been a point of great concern in the industry.

The temperature of lithium batteries indicates the thermal state of the battery, and the essence behind it is the result of heat generation and heat transfer of lithium batteries. Studying the thermal characteristics of lithium batteries and their heat - generation and heat - transfer characteristics under different states enables us to recognize the main pathways of exothermic chemical reactions inside lithium batteries.

Unsafe Behaviors

The unsafe behaviors of lithium batteries include over - charging, over - discharging, fast charging and discharging, short - circuit, mechanical abuse conditions, and high - temperature thermal shock. These situations can easily trigger dangerous side reactions inside the battery to generate heat and directly damage the passivation films on the negative and positive surfaces.

When the cell temperature rises above 130 °C, the SEI (Solid Electrolyte Interphase) film on the negative surface decomposes, causing the highly active lithium - carbon negative electrode to be exposed to the electrolyte and violent redox reactions to occur. The heat generated makes the battery enter a high - risk state. When the local temperature inside the battery rises above 200 °C, the passivation film on the positive surface decomposes, oxygen is evolved from the positive electrode, and violent reactions with the electrolyte continue to occur, generating a large amount of heat and forming high internal pressure. When the battery temperature reaches above 240 °C, violent exothermic reactions between the lithium - carbon negative electrode and the binder also occur.

Safety Evaluation Instruments for Lithium Batteries

In the research on the safety of lithium batteries, calorimeters are the most commonly used instruments. The most commonly used calorimeter is the accelerating rate calorimeter, abbreviated as ARC. ARC is a new thermal analysis instrument recommended by the United Nations for the evaluation of dangerous goods. It can provide time - temperature - pressure data of chemical reactions under adiabatic conditions.

ARC is designed based on the adiabatic principle. It can use a relatively large sample volume, has high sensitivity, and can accurately measure the initial temperature of thermal decomposition of the sample, the curves of temperature and pressure changing with time during the adiabatic decomposition process. In particular, it can show the slow - changing process of pressure during thermal decomposition of substances that cannot be provided by differential scanning calorimetry and differential thermal analysis.

ARC Safety Evaluation Methods

ARC provides an approximately adiabatic environment by precisely tracking the temperature and avoiding heat exchange between the tested sample and the environment, mainly testing and analyzing the exothermic behavior of the tested sample.

In addition to testing thermal runaway, by taking advantage of the feature that ARC can provide an adiabatic environment, ARC can be combined with a DC constant - current source and charging - discharging equipment to test the specific heat capacity of the battery and the adiabatic temperature rise during the charging - discharging process.

The temperature issue of lithium batteries has a great impact on the safety of lithium batteries. The environment in which they are used also has a certain temperature, and lithium batteries also generate heat during use. Importantly, temperature has a relatively large impact on the chemical reactions inside lithium batteries. Excessively high temperature can even damage the service life of lithium batteries, and in severe cases, it can cause safety problems of lithium batteries.

Lithium Batteries ,Ensure Quality

Our lithium battery production line has a complete and scientific quality management system

Ensure the product quality of lithium batteries

Years of experience in producing lithium batteries

Focus on the production of lithium batteries

WE PROMISE TO MAKE EVERY LITHIUM BATTERY WELL

We have a comprehensive explanation of lithium batteries

QUALIFICATION CERTIFICATE

THE QUALITY OF COMPLIANCE PROVIDES GUARANTEE FOR CUSTOMERS

MULTIPLE QUALIFICATION CERTIFICATES TO ENSURE STABLE PRODUCT QUALITY

Providing customers with professional and assured products is the guarantee of our continuous progress.

Applicable brands of our products