Linear discharge integrated autonomous equalization chip

Abstract

The invention relates to a linear discharge integrated autonomous equalization chip which comprises a high-precision reference voltage module, a discharge resistor, a first amplifier, a second amplifier, a first MOS tube, a second MOS tube and a power tube. The high-precision reference voltage module is connected with the anode of a lithium battery and outputs reference voltage; the source of the first MOS tube is connected with the anode of the lithium battery, and the drain is grounded by connecting the first resistor and the second resistor in series; the negative input end of the first amplifier is connected with reference voltage, the positive input end is grounded through the second resistor, and the output end is connected with the grid of the first MOS tube; one end of the discharge resistor is connected with the drain of the first MOS tube, and the other end is connected with the drain of the second MOS tube; the drain of the second MOS tube is connected with the positive input end of the second amplifier; the drain of the power tube is connected with the positive electrode of the lithium battery, and the source of the power tube is connected with the negative electrode of the lithium battery; the negative input end of the second amplifier is connected with reference voltage, and the output end is connected with the second MOS tube and the grid of the power tube. The chip can intelligently balance the voltage of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a linear discharge integrated integrated independent equalization chip, an independent equalization system for lithium battery packs and an independent equalization method for lithium batteries. Background technique [0002] Lithium batteries have the advantages of small size, light weight, long life, and environmental protection. In recent years, they have been used more and more widely. However, due to the low voltage of a single battery, under the same voltage conditions as lead-acid batteries, more single lithium batteries need to be used in series. . [0003] Based on the characteristics of lithium batteries, it is necessary to do a good job of charging and discharging protection during use to ensure the safety and stability of the battery and its long life. When charging, the voltage is higher than a certain value, and power-off protection is needed to prevent th...

AI Technical Summary

Problems solved by technology

[0005] At present, the passive equalization scheme for battery pack equalization management in the existing technology is basically a cross-current discharge mode, and the battery voltage consistency is poor after charging and discharging

In addition, the peripheral detection circuit needs additional power supply, consumes a lot of power, and cannot realize real-time detection, and there are phenomena such as overshoot and overdischarge.

At the same time, the realization of high-precision detection requires expensive chips such as high-precision ADC and high-precision reference voltage, and the cost is very high

In addition, the battery pack equalization system requires a combination of controllers, resistive loads, and relays. The system structure is complex and the integration level is low, which is not suitable for lightweight and high-reliability applications.

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