Lithium battery bulges cannot be deflated. Once sealed, they are vacuum sealed to prevent moisture from entering.
The lithium battery bulge is actually gas. It is mainly caused by the decomposition of the electrolyte. The gas generated by the irreversible reaction cannot be released. It is strongly recommended not to use it. When the gas inside accumulates to a certain amount and the pressure is too high, an explosion will occur, which is very dangerous. Lithium batteries are completely sealed. If the battery is bulging, it means there is a quality problem. If the battery is bulged, do not use it.
Detailed information:
1. Issues related to lithium battery manufacturing level, cell coatingsuneven ctrodes and difficult production processes.
2. The violent reaction of the short circuit generates a large amount of heat, which causes the electrolyte to decompose and vaporize, and the battery to swell.
3. Additionally, the lithium battery will swell if not used for a long time, because air is conductive to a certain extent. Therefore, if left too long, it is equivalent. upon direct contact between the positive and negative electrodes of the battery, a chronic short circuit has occurred.
4. Overcharging and overdischarging issues when using lithium batteries. When using lithium batteries, a violent reaction similar to a short circuit occurs inside the battery, generating a large amount of heat. in turn, the electrolyte decomposes and gasifies. The battery is swelling.
Lithium titanate (LTO) is used as an anode material in Due batteries. Due to its own characteristics, the material and the electrolyte tend to interact, and gas is released during the reaction of the charge-discharge cycle. Therefore, ordinary lithium titanate batteries are prone to gas, leading to cell swelling and a significant reduction in electrical performance. . decline, significantly reducing the theoretical lifespan of lithium titanate batteries. Test data shows that ordinary lithium titanate batteries swell after about 1,500 to 2,000 cycles, making them unable to be used normally. This is also an important reason that limits the large-scale application of lithium titanate batteries. Unlike conventional lithium-ion batteries, after the commissioning of domestically produced lithium titanate batteriesand abroad for some time, traces of gas are often observed in individual soft-packaged cells. These gases are different from those produced during the formation of a new battery. The former can be eliminated during the battery production process.
But the latter is produced when using the battery, or it is difficult to avoid under the current conditions of the process. Taking soft batteries as an example, lithium titanate batteries generally rely on strong plywood pressure at both ends to maintain uniform contact between the battery pole pieces to maintain current density uniformity , whether gas is produced or not. Excessive gas production will obviously affect its performance. At present, Toshiba's aluminum shell lithium titanate battery shows its superiority. The hard shell can hold a psmall amount of gas in the battery without excessive distortion. However, when the aluminum shell battery becomes larger (e.g. 50 Ah), the effectiveness of the hard shell in resisting air pressure will be weakened. The author believes that the study of the chemical reaction mechanism of gas generation during circulation should be a good scientific research topic. Additionally, one of the advantages of lithium titanate battery technology is its high power. Although the battery itself can support high current charging and discharging, thick individual cells are still not suitable for high power applications, because the heat generated by large currents will be difficult to dissipate if the battery is too thick . Therefore, for high-power lithium titanate batteries, large and thin soft battery structures are still a reasonable choice.