What is the lithium battery pack made of?

 What is the lithium battery pack made of?

The lithium battery pack mainly includes battery modules, institutional systems, electrical systems, thermal management systems, and BMS.

Battery module: If a lithium battery pack is compared to a human body, then the module is the heart, responsible for storing and releasing energy, providing power for the car.

Institutional system: mainly composed of the battery pack cover, tray, various metal brackets, end plates, and bolts, it can be seen as the "skeleton" of the battery pack, playing a role in supporting, resisting mechanical impact, mechanical vibration, and environmental protection (waterproof and dustproof).

Electrical system: mainly composed of high-voltage jumpers or high-voltage harnesses, low-voltage harnesses, and relays. The high-voltage wiring harness can be seen as the "major artery" of the battery pack, continuously delivering the power of the power battery system's heart to various required components. The low-voltage wiring harness can be seen as the "neural network" of the battery pack, transmitting real-time detection and control signals.

Thermal management systems: There are four main types of thermal management systems: air-cooled, water-cooled, liquid cooled, and phase change materials. Taking a water cooling system as an example, the thermal management system mainly consists of a cooling plate, cooling water pipes, insulation pads, and thermal conductive pads. The thermal management system is equivalent to installing an air conditioner for the battery pack.

BMS: Battery management system can be seen as the "brain" of batteries. Mainly composed of CMU and BMU.

CMU: Cell monitor unit, responsible for measuring parameters such as voltage, current, and temperature of the battery, as well as balancing functions. After the CMU measures these data, the data is transmitted to the BMU through the battery "neural network" mentioned earlier. Official account power battery BMS

BMU: Battery management unit.

Responsible for evaluating the data transmitted by the CMU. If the data is abnormal, protect the battery, issue a request to reduce current, or cut off the charging and discharging path to avoid exceeding the allowed usage conditions. At the same time, manage the battery's power and temperature. Based on the previously designed control strategy, determine the parameters and states that require warning, and send the warning to the vehicle controller, ultimately conveying it to the driver.

What is a PACK battery pack?

Firstly, it is important to understand the general distinction between lithium battery cells, lithium battery modules, and lithium battery packs:

Battery cell: The most basic element that makes up a battery pack and battery pack, typically providing a voltage between 3v and 4v

Battery module: a collection of multiple units, forming a single physical module that provides higher voltage and capacity;

Battery pack: It is generally composed of multiple battery packs, and also includes battery management systems (BMS), which are the final products provided by the battery factory to users.