What are the risks of fast charging for lithium battery bags?

Lithium battery fast charging brings three effects: thermal effect, lithium evolution and mechanical effect 1. Frequent fast charging accelerates the polarization of battery cells. When the charging current is large, the ion concentration at the electrode increases, and the polarization increases. The battery terminal voltage cannot be linearly proportional to the charged power/energy pen. At the same time, when charging with high current, the increase of internal resistance will increase the Joule heating effect and bring about side reactions, such as electrolyte reaction analysis, gas production and a series of problems. The risk factor is suddenly added, which affects the safety of the battery. The battery life will inevitably be greatly shortened. 2. Frequent fast charging may lead to cell crystallization. Fast charging of lithium batteries means that lithium ions are quickly released and swim to the negative electrode. At this time, the negative electrode material must have a rapid lithium insertion ability. Since the lithium insertion potential is similar to the lithium precipitation potential, Under fast charging or low temperature conditions, lithium ions may precipitate on the surface to form dendritic lithium. Dendrite lithium will pierce the separator and cause secondary loss of Li, reducing battery capacity. When the lithium crystal reaches a certain amount, it will grow from the negative electrode to the separator, causing the risk of battery short circuit. 3. Frequent fast charging will shorten the battery life. Frequent charging will also accelerate the consumption of the battery life, and even lead to problems such as reduced battery activity and shortened battery life. Especially after the addition of fast charging technology, although the charging speed is very fast in the early stage, it is not fully charged to 100% and the cable is unplugged, causing multiple charging and increasing the number of cycles of the battery. Long-term use will reduce the battery. The activity, thereby accelerating the aging of the battery. High temperature is the biggest killer of lithium battery aging. The high power of fast charge will heat up the battery in a short period of time. Non-fast charge has low power and low heat per unit time, but requires a longer power-on time. In this way, the battery heat will also accumulate over time, and the difference in heat during the charging process is not enough to cause the difference in the battery aging rate. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Which battery is suitable for marine storage batteries?