How to prevent the battery from being over-discharged or over-charged due to improper use?

Lithium battery safety: In order to prevent overdischarge or overcharge caused by improper use of the battery, there are three maintenance mechanisms for single lithium batteries. First, select the switch element. When the temperature of the battery rises, its resistance also rises. When the temperature is too high, it will actively continue to supply power. The second is to select the appropriate diaphragm information. When the temperature rises to a certain value, the micro-pores on the diaphragm will actively dissolve, and then lithium ions cannot pass through, and the internal reaction of the battery continues; the third is to set a safety valve (that is, the vent on the top of the battery) , When the internal pressure of the battery rises to a certain value, the safety valve is actively opened to ensure the safety of the battery. Sometimes, although the battery has a safe control method, the control fails due to some reasons. The short safety valve may not be released through the safety valve, and the internal pressure of the battery will rise sharply, causing an explosion. Generally speaking, the total energy stored in a lithium battery is inversely proportional to its safety. As the battery capacity increases, the battery volume also increases, and its heat dissipation function is getting worse and worse. With regard to mobile phone lithium batteries, the most basic requirement is that the probability of a safety accident should be less than one in a million, which is also the lowest standard that the public can bear. Regarding large-capacity lithium batteries, especially for automobiles and other large-capacity lithium batteries, the choice of forced cooling is particularly important. Choose safer electrode data, choose lithium manganate data, from the molecular structure to ensure that when fully charged, the lithium ions of the positive electrode are now completely embedded in the carbon pores of the negative electrode, preventing dendritic attacks from the roots. The stable structure of lithium manganese oxide, its oxidation function is much lower than that of lithium cobalt oxide, and the decomposition temperature of lithium cobalt oxide exceeds 100°C. Even because of external short-circuit attack (acupuncture), external short-circuit, it can completely prevent the risk of ignition during charging. Separation of lithium metal caused by blasting. In addition, the use of lithium manganate data can also greatly reduce costs. The current functional safety control techniques must first improve the safety functions of lithium batteries, which is particularly important for large-capacity batteries. Choose a separation with a good thermal shutdown function. The purpose of separation is to block the positive and negative electrodes of the battery together and allow lithium ions to pass through. When the temperature rises, seal on the barrier melting line, and then increase the internal resistance to 2000 ohms to allow the internal reaction to continue. When the internal pressure or temperature reaches the preset standard, the explosion-proof valve will open and initially release the pressure to prevent excessive accumulation and deformation of internal gas, which will cause the tube to burst after all. Itinerary control activities, select more active control parameters and select joint control of multiple parameters (this is particularly important for large-capacity batteries). The high-capacity lithium battery pack is composed of multiple batteries in series/parallel. For example, the voltage of a notebook computer exceeds 10V, and the capacity is large. Under normal circumstances, 3~4 series single cells meet the voltage requirement, and then 2~3 series battery packs are connected in parallel to ensure large capacity. To build a more complete maintenance function for large-capacity battery packs, two circuit board modules must be considered: the protection board PCB module and the smart battery dashboard module. The entire battery maintenance plan includes: Level 1 maintenance IC (to prevent battery overcharge, over discharge, and short circuit), level 2 maintenance IC (to prevent secondary overvoltage), fuse, LED display, temperature adjustment and other components. Under the multi-level maintenance mechanism, even if the power charger or laptop is abnormal, the laptop battery can only become active maintenance. Assuming that the situation is not serious, it will often work normally after plugging in from the beginning, and it will not happen. burst. Lithium batteries used in laptops and mobile phones use basic skills that are not safe and require a safer structure. In short, with the improvement of data skills and knowledge of the planning, manufacturing, testing, and deployment requirements of lithium batteries, lithium batteries in the future will become safer. 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: Analysis of the design of the lithium battery charging system