Battery charging usually has two methods: active equalization and passive equalization. By using an active equalization scheme, the potential of the battery can be completely released. For example, in Shanghai, EV buses have used TI's active equalization solution. In theory, the mileage of the EV bus is 150 kilometers full of electric energy. In the actual operation, it only ran for 83 kilometers. Later, TI helped optimize its plan. The original passive balance was replaced by active balance, and now it can run to about 105 kilometers. It can be seen that from the early passive scheme to the active balancing scheme, 25% and 26% of the mileage increased.
In the new energy vehicles, the bus usually adopts active balancing. The car adopts passive equalization due to cost considerations, such as Tesla, one of the largest car manufacturers in Europe. It is expected that the 2017 and 2018 cars will adopt active balancing in large quantities. The passive equalization algorithm is simple. To help customers use active balancing, TI provides the underlying algorithms for active balancing.
In order to promote the adoption of active balancing, TI will launch a 16-segment active balancing solution, TIDA-00817, in July 2016. “By using accurate active balancing, the TIDA-00817 can take full advantage of the battery's power, which allows the car to run farther.†Yao Zhicheng said: “In addition, the built-in self-test helps verify internal functions, including integrated voltage comparators. , can keep the battery voltage within the correct range to prevent accidents."
Specifically, the highlight of TIDA-00817 is: Based on the bq76PL455A-Q1 stackable monitor and protector, it can be used in high-capacity lithium-ion batteries. In addition, highly accurate monitoring of a 16-cell lithium-ion battery is possible. There is an integrated protector. High system reliability, including a 1Mb/s stackable isolated differential UART; support for open wire detection. 2-5A active equalization is achieved, which can be completely isolated and transmitted to an external 12V power supply/battery.
Figure TIDA-00817 reference board
In fact, there are three TI chips on the TIDA-00817 reference board: BQ76PL455A, EMB1428Q, EMB1499Q. The 455A is the core, mainly for the coordination of large systems, and monitoring between each battery. The 1428 is a DC-DC controller. Because there are MOS tubes in the BMS system, it needs to be driven. In addition, there are about seven or eight such boards in a system. 1499 controls 1428 for internal coordination.
It is reported that TIDA-00817 can be used in pure electric and hybrid vehicles (EV, HEV, PHEV, light hybrid, start/stop system). It is also suitable for the latest 48V systems, energy storage systems (ESS), and uninterruptible power supplies (UPS).
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