Introduction to the basic knowledge of lithium battery protection board

Because lithium batteries are more sensitive to voltage, higher or lower voltages will affect battery life and even damage the battery. Therefore, lithium batteries must be protected by the protection board. The protection board is mainly used to protect the lithium battery pack from charging and discharging. The important functions are as follows: 1 , Overcharge protection, guard against battery damage caused by overcharge of lithium battery cells; 2. Overdischarge protection, guard against battery damage caused by overdischarge of lithium battery cells; 3. Current limit and short circuit protection, guard against lithium battery packs that exceed the rated current or use The short circuit causes damage to the battery and the protection board itself; 4. The equalization function allows each battery cell to overflow; 5. The temperature control protection allows the lithium battery to work within the normal temperature range, otherwise the input and output will be stopped. The protection board can be simply understood as a switch, but this switch is connected in series to the negative electrode of the battery. The same port board is the charge and discharge shared output negative electrode, and the split port board is the charge and discharge negative electrode separated, and the positive input and output of the battery are from the total battery pack. Positive output. The balanced cable of the protection board is to monitor the voltage of each string of batteries, and then the main control chip will switch the control MOS according to the voltage of the balanced cable to achieve the most important function of overcharge and overdischarge protection for the lithium battery pack. , It also has other functions such as equalizing charging, current limiting, and temperature control. The important functional components and input and output interfaces of the protection board are described as follows (take 4 strings as an example, and the number of multiple strings is also the same) Of course, the above interface and component descriptions are important, and the boards of different manufacturers may be slightly different. For example, in order to improve the monitoring and management of the entire battery pack, various management and control interface statements will be added: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: What is the electric vehicle battery? More durable?