Overview:
Using a battery monitoring chip LTC6802 from Linear Technology of the United States, a monitoring platform for lithium-ion battery packs was designed. The system board can monitor up to 12 series of single cells, and can realize the monitoring of more cells in a distributed structure. The functions designed by the system include single voltage acquisition, single temperature acquisition, battery pack passive equalization, and distributed CAN communication. The main features of the LTC6802 are its high voltage acquisition accuracy and high integration. It has a good application prospect in battery applications, especially in pure electric/hybrid vehicles.
With environmental and energy issues becoming more and more serious, electric vehicles and hybrid vehicles (EV/HEV) have become the focus of attention in the world today. The battery is the power link of the EV, but its single terminal voltage and capacity are small. For example, the widely used lithium iron phosphate (LiFePO4) battery terminal voltage generally does not exceed 3.65 V, so it is often necessary to use multiple cells in series and parallel combination to meet Vehicle demand [1-3]. For a car battery pack, a fully functional monitoring system is necessary. At present, there are two major problems in the domestic battery monitoring equipment: First, the battery voltage detection accuracy is not high, and second, the battery pack equalization control is more complicated to implement. In response to these problems, this paper uses Linear Technology's new battery pack monitoring chip LTC6802 to design a hardware monitoring platform for lithium-ion battery packs. The platform's design features include cell voltage/temperature sensing, battery pack equalization, and distributed CAN communication.
1 Battery Pack Monitor Chip LTC6802 Introduction
The LTC6802-1 is a chip specifically designed for battery pack monitoring. Each chip can detect up to 12 serially connected cell voltages with a total input voltage of up to 60V, either via a distributed bus structure or by directly connecting the chips in series. To achieve voltage detection of more series connected cells. In addition, the LTC6802-1 has the following features:
(1) With 12-bit ADC, high voltage acquisition accuracy, up to 5~8 mV; (2) Passive equalization function, can discharge over-voltage monomer through on-chip (or externally extended) MOSFET switch; 3) 1 MHz SPI compatible serial communication interface; (4) Strong anti-electromagnetic interference capability.
In general, the LTC6802 has a comprehensive battery pack monitoring function, high chip integration, and high voltage acquisition accuracy. In addition to EV/HEV, the main applications include high-power portable device power management and backup battery pack. System monitoring.
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