A detection device and detection method for micro-short circuit inside a battery

Abstract

The invention provides a detection device for internal micro-short circuit of the battery. The invention continuously monitors the battery during the charging process of the battery. The key point of the invention is to use a differential circuit to filter out rapidly changing voltage signals. The present invention uses the characteristics of the differential circuit to isolate the DC voltage of the battery, and at the same time sends the separated small variable voltage signal to the amplifier for amplification, which reduces the requirements for high-precision instruments, and adopts a high-speed AD converter to amplify the amplified signal Acquisition is carried out, and the captured voltage change signal is transmitted to the computer through the single-chip microcomputer, and finally the product with a small internal short circuit is judged. Moreover, forward amplification or direction amplification can be performed, and secondary amplification can be performed to more effectively and accurately detect the subtle voltage or current changes of the battery, so as to detect problematic batteries or observe the battery status at any time to estimate the service life of the battery.

Description

technical field [0001] The invention relates to a detection device inside a battery and a detection method thereof. Background technique [0002] At present, there are sometimes some technical problems in the production process of the battery, for example, the electrode foil will produce burrs when cutting the edge, or the electrolyte and electrolytic paper contain impurities, etc.; as the battery charging voltage increases and the internal temperature of the battery increases, The burrs or impurities in the battery will pierce the electrolytic paper to cause instantaneous discharge, and at the same time, a large amount of heat energy will be generated, ranging from carbonization of the electrolytic paper to severe battery fire and explosion. The position where the short circuit occurs will vaporize the electrolyte due to the high temperature, and the electrolytic paper will dry up and temporarily become an insulating state, but it will be immersed in the electrolyte again t...

AI Technical Summary

Problems solved by technology

Due to the uncertainty of the occurrence of micro-short circuits in products that have experienced micro-short circuits, it is difficult to detect micro-short circuits in batteries

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