18650 battery 2600mah

　　Application of LTC6802 in 18650 battery 2600mah pack balancing circuit

　　Application of LTC6802 in 18650 battery 2600mah pack balancing circuit - This article introduces the application of LTC680221 chip in 18650 battery 2600mah pack balancing circuit. The designed balancing circuit uses battery voltage as the balancing criterion. The LTC680221 chip is used to collect voltage and temperature. The Atmega16L microcontroller passes The SPI method reads the voltage and temperature values of the battery pack, and performs corresponding balancing management and battery pack protection.

　　Abstract: This article introduces the application of the LTC680221 chip in the 18650 battery 2600mah pack balancing circuit. The designed balancing circuit uses the battery voltage as the balancing criterion. The LTC680221 chip is used to collect the voltage and temperature. The Atmega16L microcontroller reads the voltage and temperature of the battery pack through SpI. temperature value, and perform corresponding balancing management and battery pack protection.

　　1. Working principle of balancing circuit

　　This article designs a battery pack balancing circuit based on the LTC680221 18650 battery 2600mah pack management chip. It consists of four parts: a power taking system, an embedded processor, and an LTC680221 data acquisition and balancing circuit.

　　The power supply system is the power supply source of the balancing circuit. The power is taken from the 18650 battery 2600mah pack and provided to the low-power embedded processor and LTC680221 chip. The embedded processor is the core of the equalization circuit. On the one hand, it communicates with the LTC680221 through the SpI interface, and on the other hand, it simply processes the obtained data. The data acquisition circuit is mainly composed of the LTC680221 chip, which has a built-in high-precision AD converter. Combined with an external filter circuit, it can accurately sample the parameters of the 18650 battery 2600mah pack. The special design of the LTC680221 chip balance interface can control the external balance circuit to work, simplifying the balance circuit.

　　1.1 Power taking system

　　LTC680221 can manage up to 12 series-connected 18650 battery 2600mah packs. Taking the WX11I3215 18650 battery 2600mah produced by Wanxiang Electric Vehicle Co., Ltd. as an example, the voltage of a single battery changes at 2.83.8V during use. The 12-series WX11I3215 18650 battery 2600mah pack is at During use, the total voltage of the battery pack changes within a range of 33.645.6V. The embedded processor Atmega16LLTC680221 in the balancing circuit is powered by a 5V DC power supply, so the output voltage of the power taking system is selected to be 5V. Since the balancing circuit uses low-power chips, the output power of the power-taking system is selected to be 5W. Based on the particularity of the wide-voltage input of the above-mentioned power-taking system, the power-taking system in this article uses the monolithic switching power supply chip TOpSwitch to design a switching power supply with a wide input voltage range.

　　1.2 Embedded processor and SpI interface

　　This article uses Atmel's AVR series processor Atmega16L. This chip has 16kb of online programming Flash program memory, 512 bytes of EEpROM, 2kbSRAM, 32 general working registers, 32 general I/O ports, and rich features such as SpI and USART. peripherals. At the same time, the At2mega16L chip has a low-power chip package that can meet the design requirements of a low-power balancing circuit. The chip's rich internal resources and interfaces can complete various functions of the 18650 battery 2600mah pack management system. The Atmega16L communicates with the LTC680221 via the SpI bus.

　　The LTC680221 chip SpI working mode is fixed to CpHA=1, CpOL=1, the byte is sent high-order first, and can support the host's maximum SpI shift frequency to 1MHz. Therefore, the SpI peripheral control register must have the same configuration when writing the SpI driver function of Atmega16L.

　　In the balancing circuit designed in this article, Atmega16L reads the AD conversion value of each battery voltage through the SpI bus, then sorts the battery voltages, selects the battery corresponding to the highest voltage, and then sends instructions to control the LTC680221 to operate the balancing circuit. The software process is shown in Figure 2.

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