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Why does the lithium battery pack not discharge?

Time:2020-12-28 Views:158

  The phenomenon that the lithium battery pack does not discharge: After charging the lithium battery pack into the device, the device cannot work, and the open circuit voltage of the battery pack does not change or changes little.

  1) Check whether the battery/battery pack is zero voltage, high internal resistance battery;

  2) Whether the electronic components and protection circuit in the battery pack are damaged;

  3) Check whether the discharge circuit of the equipment is normal.

  4) Whether the tabs are broken, forming a disconnection

  Treatment method for non-discharge of lithium battery pack:

  1) Use a fully charged battery/battery pack of the same type to connect to the device, and whether the device is working properly;

  2) Use a multimeter to check whether the electronic components and the protection circuit inside the battery are normal.

  3) Repeat the analysis and processing of the single cell zero voltage step;

  4) If the discharge circuit of the electrical appliance is abnormal, it is recommended that the customer repair and replace the electrical appliance in time;

  5) If the customer does not modify the battery pack by himself, a dedicated technician is required for further analysis.

Why does the lithium battery pack not discharge?(图1)

  Lithium battery capacity calculation method

  The capacity of the polymer lithium battery is related to the model size and depends on the thickness, width and length of the battery. It is also related to the material and size of the battery. The actual calculation formula of polymer lithium battery capacity is very complicated, and the relationship with volume is not linear. Many factors need to be considered. For example, different materials have a great influence on the actual capacity. The larger the size, the larger the capacity/volume ratio.

  To quickly estimate the capacity of a polymer battery, the commonly used estimation formula (for estimation only):

  Capacity = thickness * width * length * K (K unit is mah/mm3)

  The range of K value is (0.07~0.11). The K value depends on the size of the capacity. The larger the capacity, the larger the K value, the smaller the capacity, and the smaller the K value (it can be understood as the larger the size, the larger the K value).

  In actual calculations, the K value can be set to 0.1 by default. For example, 103450LP (thickness 10mm, width 34mm, length 50mm), calculated capacity=10*34*50*0.1=1700, the actual capacity is above 1800mah; for example, 603048LP (thickness 6mm, width 30mm, length 48mm), calculated capacity=6* 30*48*0.1=864, the actual capacity can be 900mah.

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