Application of high-power electronic load in power battery protection board testing

With the rapid development of power batteries in recent years , there have been considerable breakthroughs in production processes, material technology improvements, and price advantages, so it has also laid a solid foundation for multi-parallel and multi-series. With the continuous development of the market, the application fields of power batteries are becoming more and more extensive, such as electric bicycles, electric cars, electric buses, electric tools, etc., and these application fields require batteries to provide relatively large application power . At the same time, when power batteries are used in these fields, effective protection of the battery is naturally indispensable for the safety and life of the battery. At this time, the protection board is also one of the core components in the battery pack.

As the name implies, the power battery protection board is used to protect the battery from damage and extend the battery life. And it only provides the most stable and effective protection to prevent accidents when there are extreme problems with the battery. It should not be operated at ordinary times. Of course, monitoring work is necessary, just like the fuse or safety switch in our home appliances. In a word, the protection board is mainly to protect the battery pack stably, reliably and safely, ensuring the normal and safe use of the battery pack or using it for a longer time.

The power battery protection board requires a kind of testing equipment during the research and development and production process - a high-power electronic load.

Shenzhen Feisitech Technology Co., Ltd. (hereinafter referred to as Feisitech) develops and produces the FT6800A series of high-power programmable DC electronic loads (models FT6801A, FT6802A, FT6803A, FT6804A, FT6807A, FT6808A, FT68014A and FT6815A series). The power of this series of electronic loads ranges from 1.6KW to 50KW. The basic parameters of some models of electronic loads are as follows:

The FT6800A series of high-power electronic loads can help users provide a series of protection functions for the equipment under test, such as over-current, over-voltage, over-power, over-temperature and voltage reversal. The FT6800A series of high-power electronic loads has four communication interfaces, including GPIB, RS232, LAN and USB. Through these interfaces, users can easily achieve remote monitoring by connecting to computers using standard command systems.

The host computer software configured for the FT6800A series of high power electronic loads allows users to print reports, generate images, export reports and save data for intuitive analysis, recording and test reports.

The protection items of the protection board during the use of the power battery mainly include:

1. Voltage protection (overcharge protection and over-discharge protection).

Overcharge protection: In the past, the protection voltage of a single battery would be 50~150mV higher than the fully charged voltage of the battery. However, power batteries are different. If you want to extend the battery life, your protection voltage should be the fully charged voltage of the battery, or even lower than this voltage.

For over-discharge protection, try to set the voltage slightly higher than the over-discharge voltage of a single battery, because the discharge characteristics of each battery are completely different. Therefore, it is a good way to protect the battery in advance, which is a good way to protect the battery life. [page]

2. Current protection: It is mainly reflected in the working current and overcurrent that disconnects the switch MOS to protect the battery pack.

The damage of MOS tube is mainly caused by a sharp rise in temperature, and its heating is also determined by the current size and its own internal resistance.

Overcurrent protection (maximum current) is an essential and critical protection parameter for the protection board.

The overcurrent protection delay also needs to be adjusted accordingly based on different products.

3. Short-circuit protection: Strictly speaking, it is a voltage comparison type of protection, which means that it is directly shut down or driven by voltage comparison.

4. Temperature protection: The protection board protects the battery itself by detecting the temperature of the battery and disconnecting the main switch.

5. MOS protection: mainly the voltage, current and temperature of MOS. Of course, the withstand voltage of MOS must exceed the voltage of the battery pack, which is necessary.

It can be said that the Feishi FT6800A series high-power programmable DC electronic load is a high-end test equipment with extremely high cost performance, and it is a product worthy of users' trust in the process of testing power battery protection boards.