A capacitance testing system and testing method for a supercapacitor

Abstract

The invention discloses a system and method for testing capacitance of a supercapacitor. The system comprises a programmable precise direct current source V1, a programmable direct current electronic load I1 and a plurality of sets of capacitor testing circuits. Each capacitor testing circuit is composed of a capacitor to be detected, a charging branch, a discharging branch, an AD collecting branch and a relay, wherein the charging branch is connected to the programmable precise direct current source V1 in parallel, the discharging branch is connected to the programmable direct current electronic load I1 in series, and the charging branch and the discharging branch are switched over through the relay. The system and method have the advantages that the parallel-connection charging, series-connection discharging, automatic switchover, differential input and synchronous scanning are adopted, the testing efficiency and the detecting automatic degree of a double electric layer capacitor are greatly improved, the consistency of measuring conditions is good, the measuring speed is high, the cost is low, and the industrialization mass production is facilitated.

Description

technical field [0001] The invention relates to a capacitance testing system and a testing method of a supercapacitor, belonging to the technical field of capacitor testing. Background technique [0002] After entering the 21st century, with the economic development of all countries in the world, the consumption of non-renewable energy such as oil, natural gas, coal, etc. is accelerating, and mankind will face the huge challenge of energy depletion. In this context, countries are actively seeking and developing new alternative energy sources such as solar energy, wind energy and other renewable energy technologies. In renewable energy technology, it is necessary to convert various forms of energy into electrical energy, store it, and output it to an external circuit when needed, and one of the indispensable components for electrical energy storage is an energy storage capacitor. [0003] Supercapacitors are called multi-channel electric double-layer capacitors, also known a...

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Problems solved by technology

[0004] For example, a supercapacitor capacity tester in China adopts the constant current method for testing. The capacity test range is 0.1F-300F, and the test accuracy is ±2%. Test requirements for different test conditions

[0005] For example, a foreign supercapacitor tester has a maximum of 12 channels. Its main advantage is that it uses LAN to communicate, and the simultaneous sampling time of voltage and current can reach 1ms. It has multiple charging and discharging methods such as constant current, constant voltage, and constant power. However, the test instrument is expensive, and its test software is special software, which cannot be used for secondary development. The maximum number of channels is 12 channels, which cannot be expanded, which is not conducive to large-scale testing.

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