Method for testing the expansion rate of the negative plate of rare earth new power supply

Abstract

The invention belongs to the technical field of hydrodynamic batteries and specifically relates to a method for testing an expansion rate of a rare earth new power supply negative electrode piece. The method comprises the steps of installing a rare earth new power supply core into a battery case, sealing a top cover, injecting liquid under normal pressure, sealing an opening, forming, discharging an activated battery, standing, switching on a rotary valve under the inert gas normal pressure atmosphere, pouring flowing electrolyte in the battery case, then adding electrolyte, switching off the rotary valve, charging and discharging for five times, standing, switching on the rotary valve under the inert gas normal pressure atmosphere, pouring out the flowing electrolyte in the battery case and weighing before and after each operation to obtain the expansion rate of the rare earth new power supply negative electrode piece in an actual use process. The method disclosed by the invention can obtain two results, and error calculation can be performed to improve the accuracy rate. The method disclosed by the invention can conveniently measure actual data of the expansion rate of the electrode piece under the condition without changing technological conditions and technological processes of a battery manufacturing technology; furthermore, the method has small error, good repeatability, simpleness, easiness, practicability, high universality and convenience in actual operation.

Description

technical field [0001] The invention belongs to the technical field of water system power batteries, and in particular relates to a method for testing the expansion rate of a negative plate of a rare earth new power supply. Background technique [0002] Rare earth new power supply A new type of water system power battery with rare earth new materials as the main application feature. As a new type of energy carrier, it has become a research hotspot in the battery industry and represents the development direction of water system power batteries. Because the rare earth new power supply has the advantages of high power, long life, environmental friendliness and recyclability, wide temperature range, safe use, and no memory effect, it is called a new generation of green batteries. In today's energy shortage and environmental pollution, rare earth new power sources show broad application prospects. [0003] Rare earth new power supply is an important chemical power source for veh...

AI Technical Summary

Problems solved by technology

In order to design a new high-performance rare earth power supply, we need to accurately know the expansion rate of the negative electrode. According to the traditional evaluation method, up to now, the volume expansion rate of the main active material abundance rare earth alloy of the negative electrode has been indirectly measured; It is independently or indirectly estimated outside the battery. This test method can measure the expansion rate of the negative electrode sheet to a certain extent, but the results of this test are different from their expansion rate in the real working environment of the battery. , does not reflect the influence of the real environment on the expansion rate of the negative electrode

In addition, the existing methods still have the disadvantages of large fluctuations in measurement data, poor reproducibility, inconvenient operation, high material consumption, and easy cross-contamination.

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