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Lithium-ion battery introduction

The development of lithium-ion batteries began in the field of consumption, and is currently developing rapidly in the fields of power and energy storage.

It is currently the technology development direction that Shanghai Huijue Network is most concerned about. In the following content, we will give a brief introduction to lithium-ion batteries.

Lithium-ion battery refers to a secondary battery (rechargeable battery) that uses lithium as an energy carrier.

When charging, lithium ions come out of the positive electrode, pass through the electrolyte and diaphragm, and are embedded in the negative electrode. The reverse process occurs when discharging, also known as rocking chair battery.

Lithium-ion batteries are divided into different cathode materials: lithium iron phosphate batteries and ternary lithium batteries.

Lithium iron phosphate material is rich in production resources, and its cost, cycle life and thermal stability are superior to ternary materials. It is suitable for commercial vehicles, low-end passenger vehicles, energy storage and other fields.

The theoretical specific capacity (energy density) of the ternary lithium battery is 60% higher than that of lithium iron phosphate, the charging rate is higher, and the low temperature performance is good, which is suitable for the fields of medium and high-end passenger cars.

According to different packaging processes, lithium-ion batteries are divided into: square batteries, pouch batteries and cylindrical batteries.

The advantages of prismatic batteries are high packaging reliability, simple structure, high energy density of a single cell, high system group efficiency, relatively good stability, relatively convenient expansion, and outstanding battery life; the disadvantage is that there are many models and difficult to unify the process , The difference between the monomers is large, and in large-scale applications, there is a problem that the life of the system is much lower than the life of the monomer.

Soft-pack batteries are packaged in aluminum-plastic film, which has the advantages of high energy density, small battery internal resistance, long cycle life, flexible size changes, and light weight; the disadvantages are poor mechanical strength, difficult sealing process, complex group structure, and high-end aluminum Plastic film relies on imports, low production efficiency, low yield, and average safety performance.

Cylindrical battery hard-shell packaging has high reliability. The advantages are high battery consistency, mature technology, low cost, good battery product yield, and good heat dissipation performance; but the disadvantages are that the heat dissipation design after grouping is difficult and the system energy density is low. Low, low liquid injection efficiency, difficult production process.