What are the influencing factors of polymer high-power batteries during high-rate charging and discharging?

The polymer high-power battery has three effects in the high-rate discharge and fast charging: thermal effect, lithium evolution and mechanical effect. 1. Frequent fast charging accelerates the polarization of battery cells. When the polymer high-power battery continues to charge a large current, the ion concentration at the electrode increases, and the polarization increases, and the battery terminal voltage cannot directly correspond to the charged power/energy in a linear proportion. 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 the reaction decomposition of electrolyte, gas production and other problems. The risk factor is suddenly increased, which will affect the safety of the battery. If it is not power The life of the type battery will inevitably be greatly shortened. 2. Frequent fast charging may cause crystallization of polymer high-power batteries. If the polymer fast charge battery means that lithium ions are quickly released and swim to the negative electrode, then 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. Dendritic lithium will pierce the separator and cause Li secondary loss, reducing the capacity of polymer high-power batteries. When the lithium crystal reaches a certain amount, it will grow from the negative electrode to the separator, causing Risk of short-circuiting the battery. 3. Will frequent fast charging shorten the life of polymer high-power batteries? Frequent charging of polymer high-power batteries can also accelerate the consumption of 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% before unplugging, resulting in multiple charging, and the number of cycles of polymer high-power batteries has been added. This is used for a long time. It will reduce the activity of the battery, thereby accelerating the aging of the battery. 4. High temperature is the biggest killer of polymer high-power battery aging. The high power of fast charge will heat up the battery in a short period of time. Although non-fast charge has low power and low heat per unit time, it requires a longer power-on time. In this way, the heat of polymer high-power batteries will also accumulate and increase over time, and the heat difference during the charging process is not enough to cause the difference in battery aging speed. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are the conditions for the use of lead-acid batteries?