System for monitoring performances of storage battery

[0013] A battery performance monitoring system, which is characterized by comprising a power supply module, a measurement module, a display module, a controller, keys, a storage module, a wireless communication module, and a communication interface; wherein the power supply module is connected to the controller; figure 1 As shown, the measurement module includes temperature measurement, voltage measurement and current measurement. The measurement module is connected to the controller; the display module, keys, storage module, wireless communication module, communication interface and storage module are all connected to the controller.

[0014] In the battery performance monitoring system of the present invention, the controller adopts an ARM LPC2132 control chip to control battery discharge and measure the total voltage and total current of the battery. LPC2132 is a 32-bit ARM7TDMI-STM CPU with strong data processing capabilities, equipped with rich interface resources, and internal multi-channel 10-bit precision A/D interface, which fully meets the requirements of battery voltage and current data acquisition accuracy, no need to increase The peripheral A/D chip simplifies the circuit design. The monitor uses a new type of PTC ceramic resistor as the battery discharge load, which avoids red heat, is safe, reliable and pollution-free. The LPC2132 expansion I/O interface is connected to the discharge control board, and the MOSFET is connected in series with the PTC resistor. The discharge control board controls the MOS-FET to control the battery flow. Discharge current through the PTC resistor. The display module adopts an LCD liquid crystal display. The liquid crystal display is an LCD128×64 liquid crystal display. The LCD12864 liquid crystal display can display 4×8 Chinese characters. It is connected to the ARM chip through a bus. The operation, parameter setting, data display, communication setting, etc. of the detector can all be displayed through the LCD display circuit. And the button circuit is completed. . The communication interface is an RS485 communication interface. The keys include a control key and a reset key. The storage module is set as U disk storage. The total voltage and total current of the battery pack are measured by the LPC2132 internal A/D module, and an external signal conditioning circuit. The signal conditioning circuit uses an instrumentation amplifier INA128UA and a low-pass filter circuit to adjust the battery voltage and current signal amplitude to the A/D input In the appropriate range, noise interference is reduced to the minimum, and input A/D module to improve measurement accuracy. The monitor adopts a short-time discharge capacity test method to test the capacity, discharge the battery with a large current for 10-20 minutes, and monitor the downward trend of its discharge voltage. Because battery capacity and voltage have a certain relationship, by analyzing the voltage drop trend, the capacity drop trend is estimated, and then the battery capacity is estimated.