18650 battery test and decomposition

Generally, 18650 lithium batteries are connected in parallel to increase capacity. For example, the 20000mah of a mobile power supply is generally composed of 8 2600mah batteries or 6 3400mah 18650 batteries. A new capacity of 3.7V is added in parallel, and then the voltage is increased by series connection. Two series connections are 3.7*2u003d7.4V, three 12.6V, and so on. 2 Generally, electric vehicles and laptop batteries need to be connected in series to increase the battery voltage to 12V or 36V48v72V, etc. At this time, if the capacity or quality of the battery is not equal, one of them will be worn out in the process of use. Just like the short board principle of a wooden barrel, a battery or a group of batteries connected in parallel affects the total battery voltage and capacity of the entire battery pack. The impact caused by 3, such as notebooks are generally 2 parallel 3 strings, forming a battery of 10.8V to 12.6V. If a group of 2 parallel batteries is worn out first, the capacity of the entire battery will decrease. The details are that the battery has a short standby time, a fast charging speed, and a fast power consumption. The same applies to equipment such as electric vehicles. 4 At this time, the battery pack is about to be replaced. Beware of the barrel effect (the short board principle that the barrel can hold water depends on the shortest plate of the barrel). In this way, the battery can be used in a balanced manner and its service life can be extended. 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: 18650 battery pack repair analysis