A fuel cell stack monolithic voltage inspection system capable of detecting positive and negative voltages

Abstract

The invention relates to a fuel cell stack monolithic voltage inspection system capable of detecting positive and negative voltages, which comprises an inspection main controller, a CANBUS and N detection units, wherein each detection unit is used for detecting the voltages of 30 single-cells, and can be used for detecting the monolithic voltage of 30*N fuel cells. A gating unit is controlled by a microcontroller MCU through a decoder, only one single-cell is ensured to be on-line at any time, a voltage signal is sent into a signal conditioning unit and is sent into the microcontroller MCU through an A / D (Analog to Digital) conversion unit, and a monolithic digital voltage signal is transmitted to the inspection main controller through the CANBUS by the microcontroller MCU. The inspection main controller sends orders, starts each detection unit to complete the detection of the voltages of 30 single-cells of each detection unit, and the monolithic voltage signals of each detection unit are sequentially received circularly, so the monolithic voltage detection of the whole fuel cell stack is realized. The whole inspection system has a simple and clear circuit, high reliability, low cost and strong expandability, and can realize high-precision detection of the fuel cell stack monolithic voltage.

Description

technical field [0001] The invention belongs to a voltage inspection system for each single unit of a series power supply, and is a fuel cell stack monolithic voltage inspection system capable of detecting positive and negative voltages. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy stored in the fuel oxidant into electrical energy. According to the fuel cell power requirements in practical applications, the fuel cell stack is usually composed of dozens to hundreds of single cells in series. During the operation of the fuel cell, the abnormality of a single cell will affect the performance and safety of the entire fuel cell stack. In order to ensure the normal operation of the fuel cell and evaluate its performance, the operating parameters should be monitored in real time. The single-chip battery voltage is the most direct reflection of the battery's power generation performance, so it should be monitore...

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Problems solved by technology

[0003] The current fuel cell monolithic voltage detection devices all have certain deficiencies, such as: the method of using resistor voltage divider and multi-channel analog switch will make the measurement accuracy not meet the requirements, and a large number of voltage divider resistors will affect the performance of the stack; Based on multiple detection units and a CAN (Control Local Area Network) network controller, the dual-CAN network fuel cell single chip needs too many detection unit circuit boards when measuring a high-power fuel cell stack, which makes the entire voltage detector bulky. , higher power consumption, higher system cost

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