Lithium iron phosphate battery protection plate

Abstract

The invention aims to provide a lithium iron phosphate battery protection plate. According to the lithium iron phosphate battery protection plate, one end of a discharge MOS tube is connected with thepositive electrodes of lithium iron phosphate batteries connected in series; one end of the charging MOS tube is connected with the other end of a discharging MOS tube, and the other end of the charging MOS tube is connected with the positive electrode of the output end of the system; one end of a current limiting module is connected with the common end of the charging MOS tube and the discharging MOS tube; the other end of the current limiting module is connected with an MCU main control unit; a pre-charging module is connected with the MCU main control unit; a current detection resistor isconnected in series between the negative electrodes of the lithium iron phosphate batteries and the negative electrode of the output end of the system, and the current detection resistor is connectedwith the MCU main control unit; a voltage sampling equalization module is connected with the lithium iron phosphate batteries connected in series; an AFE energy feedback unit is connected with the voltage sampling equalization module and the MCU main control unit. According to the invention, charging and discharging of the battery pack can be effectively monitored and protected in real time.

Description

technical field [0001] The invention relates to a lithium iron phosphate battery protection plate. Background technique [0002] Lithium iron phosphate battery is currently used as a new type of environmentally friendly, high-efficiency, and instantaneous high-current discharge power battery. Its unique performance has gradually been accepted by the market. At present, it is mainly used in solar street lights, electric tools, automobiles, and trains. In high-speed rail and other fields, the reference voltage of lithium iron phosphate power batteries is 3.2V. In order to meet the needs of use, multiple batteries must be connected in series to achieve the required voltage. After the same batch of batteries are made, their capacity and internal resistance There is a differential conduction, so the batteries with smaller differential conductance must be matched in a group before combination, so as to achieve the purpose of prolonging the cycle life of the battery to a certain ex...

AI Technical Summary

Problems solved by technology

[0003] For a battery pack composed of multiple batteries connected in series, each battery in the battery pack needs to be charged and discharged. Because solar street lights require a high input voltage, even an instantaneously variable voltage, the existing general-purpose battery The protective plate can no longer satisfy the promotion and application of the battery in the field of solar energy, hindering its promotion in this field

[0004] In order to solve this problem, it is necessary to use electronic devices with high withstand voltage and high instantaneous current impact resistance, which will inevitably result in large volume and high cost, which cannot meet the development requirements of technology

Images