EV battery

Batteries inside the long-stalled extremely exposed the mass defect?

by：Vglory 2020-12-05

Source: 2020 - 03 - 29 divided hits: time under normal circumstances, the long time storage battery will not exposed shortcomings and so on black, white, lithium spot. In the field of batteries, battery self-discharge is normally stored at room temperature by evaluation. Internal chemical system by the method of high temperature storage stability and film forming stability evaluation, through the irreversible capacity loss and irreversible capacity loss, and evaluate the internal resistance and thickness changes. It represents the positive and negative data, matching with the electrolyte or the suitability of the aging process. Film appears punctate defect may not much, I think there are the following: 1. Occurring in the process of gas storage, appear to collect bubbles, in this case, again after discharge and charge will appear black spots; 2. To store the collection of bubble may react with embedded in the cathode of lithium, cause local SEI changes, or part of a lithium salt floating on the surface plate, white patches, or after the charging and discharging lithium evolution; 3. Some metal impurities by oxidation in the positive electrode, on the negative electrode is separated again, cause small pitting; 4. Chip deal with the defects in the process of storage generally does not change, but there are some special defects cannot be eliminate, in the process of continue to place there are exceptions, but I have not met. Processing technology of lithium battery is complex, there are many exceptions.

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