Equalizing charging system for liquid state metal battery

A liquid metal battery, balanced charging technology, applied in secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve problems such as unbalanced liquid metal batteries, improve monitoring reliability, reduce The effect of reducing complexity and the number of monitoring nodes

Inactive Publication Date: 2015-12-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a balanced charging system for liquid metal batteries to solve the unbalanced phenomenon when liquid metal batteries are charged after being connected in series

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  • Equalizing charging system for liquid state metal battery
  • Equalizing charging system for liquid state metal battery
  • Equalizing charging system for liquid state metal battery

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with accompanying drawing:

[0025] The present invention is a balanced charging system for liquid metal batteries. A non-linear resistor of SiC or GaN material resistant to high temperatures of 600°C is connected in parallel at both ends of the positive and negative electrodes of each liquid metal battery. When the battery voltage is too high, most of the current will flow through the non-linear resistor, thus preventing the battery from being overcharged.

[0026] The battery monitoring system includes a data acquisition module, a data processing module, and a control module. Wherein, the data acquisition module includes a Hall sensor, a signal conditioning circuit and an AD conversion device, and is responsible for converting the measured battery pack voltage and current signals into digital signals and sending them to the data processing module; Calculate the actual voltage and current of the...

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Abstract

Disclosed in the invention is an equalizing charging system for a liquid state metal battery. With the system, passive equalization of the liquid state metal battery under high temperatures is realized. According to the system, a non-linear resistor that is made of a SiC or GaN material and is resistant to the high temperature of 600 DEG C is used for being connected with the battery in parallel; the resistance value of the non-linear resistor is the largest when the voltages at the two ends of the resistor are less than a certain value; and almost no current flows through the branch where the resistor is located. When the battery is almost charged fully, the voltage of the battery rises rapidly, the resistance value of the non-linear resistor is reduced quickly, and most of charging currents flow through the resistor branch, thereby preventing an overcharging phenomenon of the battery. An external battery monitoring unit uses a series battery group as a unit to monitor the voltage and charging capacity of the battery group in real time; when any one of the two parameters exceeds a rated value, the charging loop is cut off instantly. According to the invention, the structure is simple and reliability is high; and equalizing charging of the liquid state metal battery can be realized well.

Description

Technical field: [0001] The invention is applied to the field of large-scale energy storage of power grids, and in particular relates to a balanced charging system for liquid metal batteries. Background technique: [0002] At present, common energy storage methods in energy storage systems, such as lead-acid batteries and lithium-ion batteries, each have some problems, such as small storage capacity, limited charge and discharge life, and high cost. As a new type of energy storage battery, liquid metal battery has the advantages of long operating life, large capacity and high rate, and is suitable for application in energy storage systems. Liquid metal batteries need to work at a high temperature of 500-600°C, and their rated current can reach 100A, but the working voltage range is only 0.55-1.2V, and the voltage at the end of the charging and discharging process will change rapidly. In this way, when the batteries are charged and discharged in series, it is easy to cause o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 宋政湘宋有波王建华于乔乔沈钱锋
Owner XI AN JIAOTONG UNIV
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