With the rapid development of power batteries in recent years, whether it is production technology or material technology improvement, or price advantage, there are considerable breakthroughs, so it also lays a solid foundation for many and many strings. With the continuous development of the market, the application fields of power batteries are now more and more widely, such as electric bicycles, electric cars, electric buses, power tools, etc., and these applications require batteries to provide relatively large application power. At the same time, when the power battery is used in these fields, the protection of the battery is naturally indispensable for the safety and life of the battery. At this time, the protection board is also a very core component in the battery pack.

The power battery protection board, as its name suggests, is used to protect the battery from damage and extend the life of the battery. And it only provides the most stable and effective protection against accidents in the event of extreme battery problems. Normally, it should not be operated. Of course, surveillance work is necessary, just like the fuses or cutouts in our household appliances. In a word, the protection board is mainly to protect the battery pack stably, reliably and safely, and to ensure the normal and safe use or long-term use of the battery pack.

Power battery protection boards require a test equipment in the development and production process - high-power electronic load.

FT6800A series high-power programmable DC electronic load (models FT6801A, FT6802A, FT6803A, FT6804A, FT6807A, FT6808A, FT68014A and FT6815A) developed and manufactured by Shenzhen Festtech Technology Co., Ltd. (hereinafter referred to as Fei Si Technology), this series The series of electronic load single power from 1.6 KW to 50 KW, the basic parameters of some models of electronic load are as follows:

The high-power electronic load of Faith Technology includes basic test modes such as CC, CV, CR and CP. It also provides transient test and sequence test, and can simulate various dynamic load changes while passing the electronic load. Press the button to simulate a short circuit operation.

The FT6800A series of high-power electronic loads can help users provide protection against over-current, over-voltage, over-power, over-temperature and voltage reversal in the tested equipment. The FT6800A series of high-power electronic loads have four communication interfaces: GPIB, RS232, LAN and USB. Through these interfaces, the user can easily realize remote monitoring using a standard command system.

FT6800A series high-power electronic load configuration PC software, through which the user can print reports, generate images, export reports and save data for easy analysis, recording and testing. report.

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 our previous single-cell battery protection voltage will be higher than the battery charge voltage 50~150mV. But the power battery is different. If you want to extend the battery life, your protection voltage will choose the battery's full voltage, and even lower than this voltage.

Over-discharge protection, try to be slightly higher than the voltage of its single-cell over-discharge, because the discharge characteristics of each battery are completely different, so the battery is protected in advance, which is a good protection for the battery life.

2, current protection: It is mainly reflected in the working current and over current to make the switch MOS disconnected to protect the battery pack.

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

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

Overcurrent protection delay, it is also necessary to make corresponding adjustments for different products.

3. Short-circuit protection: Strictly speaking, it is a voltage-comparative type of protection, that is, it is directly turned off or driven by voltage comparison.

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

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

The FT6800A series of high-power programmable DC electronic loads can test the protection board by simulating the use of the power battery when testing the power battery protection board. You can use the Faith load software and the OCP/OVP/ of the product itself. OPP function, dynamic pulse function, sequence function, voltage and current monitoring terminal or automatic test function used in production, etc. Test and analyze the voltage range, current range, protection point, protection stability and dispersion of the protection board, etc. During these tests, the user can observe the timely test changes of the protection board through the operation interface of the load itself and the PC software. The various test interfaces and graphs are shown below.

It can be said that the Fei Si FT6800A series high-power programmable DC electronic load is a high-end test equipment with high cost performance, which is worthy of users' trust in the test of power battery protection board.

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