An apparatus for monitoring
battery voltage and temperature includes a host controller and acquisition boards, and every acquisition board for the battery includes a
voltage acquisition module, a temperature acquisition module, a host control
chip MCU, A / D convertor module, an opto-
isolator module, a
CAN bus communication module and two
external connection ports CN1, CN2. The input end of the AD transformation module is connected with the output end of the
voltage acquisition module and the temperature acquisition module, and the output end of the A / D convertor module is connected with the opto-
isolator module via a SPI
bus, and the I / O port of the SPI
bus module in the main control
chip MCU is connected with the opto-couple isolation module, and the host control
chip MCU is connected with the
CAN bus communication module of the host controller via the
CAN bus communication module, and the acquisition boards are connected via a socket piece in turn. The present invention is simple in structure, convenient in operation, high in data precision and high in the consistency and interchangeability of each acquisition board. Furthermore, the present invention utilizes opto-
isolator module to isolate the high-
voltage battery with the host controller circuit, so as to avoid the problem of
common mode interference.