Application of LTC6803 in battery 18650 genuine energy storage management
system
At present, research on battery management systems at home and abroad is
more concentrated in the field of electric vehicles. Energy storage battery
management systems are a key part of battery energy storage power stations. Most
battery companies in my country have just started to develop technology in this
area. A lithium-ion battery management system suitable for large-capacity energy
storage technology is proposed in the literature, and a systematic analysis is
conducted from the structure, function and management perspective of the
hierarchical management system. Other major countries (such as the United
States, Europe and other developed countries) have carried out research and
development in the key technology field of energy storage, and related
technology research and development and demonstration activities are progressing
rapidly.
From the perspective of environmental protection and economy, this work
selected some batteries from the retired electric bus nickel-metal hydride power
battery system as the energy storage battery, and designed an energy storage
battery management system. The LTC6803 collects the voltage and temperature
information of the entire energy storage system and controls the battery pack
balancing function.
1. Energy storage system architecture
The battery management side architecture of the energy storage system
designed in this work is shown in Figure 1, which can be functionally divided
into three basic units: acquisition, control and processing, and peripherals.
The microcontroller system uses Freescale 16-bit MC9S12XEG128 as the
microcontroller. The acquisition unit includes battery pack voltage sampling and
temperature sampling; the current control unit includes battery pack balance
control and relay control; the processing and peripheral unit is mainly
responsible for microcontroller signal processing and communication peripherals.
and other control modules.
LTC6803 is widely used in electric vehicles, energy storage and other
fields because of its advantages such as high sampling accuracy and simple
wiring. Therefore, the power management dedicated chip LTC6803 is selected as
the battery pack power, H≤ and temperature sampling front end. It integrates 12
voltage sampling channels It has 2 channels of temperature sampling and a
controllable battery balancing switch to balance the battery when necessary to
maintain battery consistency.
2. Hardware circuit design of power management chip LTC6803
2.1. Basic schematic diagram and introduction of LTC6803
In this design, C0 in Figure 2 is connected to the negative terminal of the
battery pack, C1~C12 are voltage acquisition ports, S1~S12 are balancing
switches; GpIO. and VTEMp. The pins are connected to the temperature acquisition
module. It should be noted that the power supply of LTC6803 is completely
provided by the battery pack, and there is no need to configure the power supply
circuit on the control board. If it is connected to an isolated power supply,
the LTC6803 can be turned off simply by disconnecting pin V.
2.2. Communication design
LTC6803 has an SpI bus-compatible serial port, and the microcontroller can
exchange data with it through this bus. The microcontroller can collect the
voltage and temperature information of the battery pack and control the battery
balancing circuit in real time by configuring the corresponding internal
registers of the LTC6803. In Figure 1, the SpI signal isolation circuit uses the
isolation chip ADuM3150 with 4 high-speed channels to ensure stable transmission
of the SpI signal.
Technology Zone 220V AC to 12V DC reference design The current status of
domestic lithium battery ternary material patent technology layout What is the
echelon utilization of automotive power batteries? It will become a hot issue
for a long time. New energy vehicle design cannot be ignored Cells and battery
materials 2020 China’s automotive power battery pack shipments and forecasts in
2020
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