Method for judging position of failure cell in energy storage type sodium-sulfur cell module

Abstract

The invention discloses a method for judging the position of a failure cell in an energy storage type sodium-sulfur cell module. The energy storage type sodium-sulfur cell module consists of a plurality of sub-loops which are sequentially connected in series; each sub-loop is formed by connecting a plurality of sodium-sulfur cell series-connection units with one another in parallel; each sodium-sulfur cell series-connection unit is formed by sequentially connecting a plurality of single sodium-sulfur cells in series; and the position of the sodium-sulfur cell series-connection unit in which the failure cell is located is judged by comparing the comparison voltage of each sodium-sulfur cell series-connection unit and the variation rate of the end voltage of each sodium-sulfur cell series-connection unit. According to the method provided by the invention, the quantity of voltage collection wires led out from a thermal insulating box is greatly reduced on the premise of ensuring that the position of the failure cell is accurately judged, so that the wiring manner is relatively sensitive, a heat radiation channel of the thermal insulating box is reduced, and the thermal insulating box keeps a constant temperature. Meanwhile, the volume of data collected by a cell management unit is further greatly reduced, and system resources can be saved.

Description

technical field [0001] The invention relates to an energy storage sodium-sulfur battery module fault judgment technology, in particular to a method for judging the position of a faulty battery in an energy storage sodium-sulfur battery module. Background technique [0002] Usually, the voltage of all batteries needs to be measured and recorded in the energy storage sodium-sulfur battery module, and whether the battery is faulty can be judged by detecting the voltage of a single battery in the module. [0003] However, in the energy storage sodium-sulfur battery module, the number of megawatt-level battery module sodium-sulfur batteries connected to the grid is huge, and detecting the voltage of each battery will bring a huge burden to the system, and the operating temperature of the sodium-sulfur battery is Between 300°C and 350°C, a relatively uniform temperature field is required. How to reduce the voltage acquisition lines in the energy storage sodium-sulfur battery modul...

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Problems solved by technology

[0003] However, in the energy storage sodium-sulfur battery module, the number of megawatt-level battery module sodium-sulfur batteries connected to the grid is huge, and detecting the voltage of each battery will bring a huge burden to the system, and the operating temperature of the sodium-sulfur battery is Between 300°C and 350°C, a relatively uniform temperature field is required. How to reduce the voltage acquisition lines in the energy storage sodium-sulfur battery module and at the same time accurately determine the location of the faulty battery is one of the research directions for those skilled in the art.

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