Test method for reliability of polymer battery

Abstract

The invention discloses a test method for reliability of a polymer battery. The test method for reliability of the polymer battery comprises the following steps: (1) measuring and recording an original voltage and an original internal resistance of a to-be-tested polymer battery, (2) arranging the polymer battery on a battery groove which corresponds to a test box in a fixed mode and making insulating treatment to lugs of the polymer battery, wherein a distance is kept between the polymer battery and four inner side edges of a groove, (3) enabling the test box to repeatedly fall from a preset height in a front, back, left, right, top and bottom direction, measuring a voltage and an interval resistance after an internal of a preset number of times, and comparing the voltage and the internal resistance with the original voltage and the original internal resistance. If the voltage and the internal resistance are abnormal, the polymer battery fails the test. The test method for reliability of the polymer battery is used for testing a degree of 'damage' to the internal structure of the polymer battery caused by impact generated from relative movement between a battery pack and an encapsulating shell in the process of falling down, such as partial misplacement of an anode and a cathode, coming off or breaking of welding spots of the lugs and a foil substrate and breaking of an anode lug. The outward manifestation is abnormity of the voltage or the internal resistance.

Description

Technical field [0001] The invention relates to the technical field of battery preparation, in particular to a method for testing the reliability of polymer batteries. Background technique [0002] As a new type of lithium battery newly developed, polymer battery has better performance than lithium ion battery, safer to use, and can be made into various sizes and shapes according to user requirements, so its use is more widespread. At present, the capacity of battery cell (cell) series products ranges from 30 to 10000mAh, and the thickness can be 0.5mm at the thinnest. It is widely used in electronic products such as Bluetooth headsets, MP3, MP4, MD, PHS phones, mobile phones, cell phones, notebook computers, etc. [0003] Polymer batteries also have some safety problems, such as short circuit, overcharge, leakage, etc. For these safety problems, there are generally corresponding safety test methods, such as short circuit test, overcharge test, impact test, needle test, storage te...

AI Technical Summary

Problems solved by technology

[0004] However, due to the characteristics of polymer batteries, they gradually occupy a dominant position in the market, especially portable electronic products, and their market share is getting higher and higher. In the daily use of electronic products, it is inevitable that the product will repeatedly drop from a small height , and there is no unified method to assess the impact of this phenomenon on the structure of polymer batteries

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