Lithium batteries, as a popular energy storage product, are playing an increasingly significant role in life, industry, military and other fields. When we talk about lithium batteries, we often encounter terms such as cells, battery modules, battery packs and battery packs, and we cannot understand their unique meanings and functions. Small series for you to preliminarily popularize these professional terms, open the door to the mystery of lithium batteries.

Lithium cell:

Also known as battery cell, lithium battery cell, is the most basic component of lithium battery. It is generally composed of three parts: positive and negative electrodes, electrolyte and diaphragm, and is the basic unit for storing and releasing energy in lithium batteries. If the cell is classified according to the positive electrode material, it can be divided into many types, such as the common ternary lithium cell, lithium iron phosphate cell and so on.

Battery pack:

It is a battery system composed of a certain number of cells through a designed series and parallel structure. The output voltage based on the corresponding multiple of the voltage of the cell is realized by adding the voltage of multiple cells in series. By connecting the cells in parallel, the capacity of multiple cells is accumulated to provide the power capacity based on the corresponding multiple of the cell capacity. The design and structure of the battery pack can be customized according to different spatial structures and application scenarios.

Battery module:

It is to add the necessary circuit and control unit to the battery pack to make a modular component. The design and structure of the battery module can be customized according to needs, such as size, shape, capacity and function can be customized. The function of the battery module is to improve the combination density and reliability of the cell, while facilitating the assembly, connection and management of the battery pack. In the traditional battery pack manufacturing process, the lithium cell is first assembled into a battery module with a designed structure, and then the battery module is installed into the battery pack with a designed structure, so that a three-stage assembly mode is formed: lithium cell → battery module → battery pack.

Battery pack:

A battery pack is a power supply device that is packaged with multiple battery modules and can be viewed as a larger battery system. It not only facilitates the installation, connection and management of battery modules, but also provides the necessary protection and monitoring functions. By equipped with BMS (Battery Management System), the battery pack can not only improve the safety of the battery, but also proactively perform thermal management to respond to changes in battery and ambient temperature, and improve the efficient operation of the lithium battery.

In SUMMARY:

In conclusion, cells, battery packs, battery packs and battery modules have different meanings in the topic of lithium batteries, from the most basic unit of the cell to a larger battery system, which together constitute a complete lithium battery.