Author ：Iflowpower – Portable Power Station Supplier
The battery is used in parallel to use the same model, the same batch, the same cycle life, and it is necessary to charge the battery or discharge, the initial single voltage is exactly the same. Non-professionals from using multiple batteries in parallel charge. There is a difference in characteristics between the battery, even if the same batch of the same type of battery, there is a difference in the characteristics of initial voltage, internal resistance, capacity.
The battery is basically different after use: such as a Lipo1S battery, the initial single-section voltage is V1 = 3.85V, a temporary name is a battery; another Lipo1S battery, the initial single voltage is V2 = 3.55V Temporary name 2 battery.
If the two batteries are connected in parallel, the first battery voltage is 0.3V in two batteries, and the copper wire is used in parallel, the internal resistance of the line is smaller, and it is R = 0.01 (actual It is still small than this value), so that the No.
1 battery will charge 2 batteries, the initial current I = (V1V2) / R = (3.853.55) / 0.
01=30A, this current is very large, may damage the connector, With the time of charging, the battery pressure difference (V1V2) will continue to decrease, the current I will continue to decrease, when two battery pressure difference (V1V2) = 0, the No. 1 battery stops to charge 2 battery. 1 Battery to 2 Battery Charge The entire duration will vary depending on the capacity of the battery, but there is an excessive current charge and discharge problem, which will damage the battery for a long time, leading to battery failure, even fire.
The battery series, the battery is connected in series, the battery is also ensured that the same model of the battery, the consistency of the same batch: battery capacity consistency, charging and discharge retrieval, voltage consistency, battery cycle life consistent. Forbidden use of different models, different capacities, different magnifications, large number of different cycles, different cycles. It is strictly forbidden to use new and old batteries, and different models are used.
Different models of battery charge and discharge characteristics are different, and they can cause malfunctions. After multiple charge and discharge cycles, the old battery has an attenuation, and the new old battery is used in series, and the battery is reduced, and even causes serious problems such as battery over, power supply failure, damage equipment. Correct approach If you use the battery in series or in parallel, try to use the number group to use.
For example, we have the same model of the same model of the same model TATTU16000MAH6S15C22.2V lithium-ion battery 6. We divided these 6 batteries into Group Group Group Group Group Group Group Group Group C, Composed of A1, A2; B batteries consisting of B1, B2, composed of C1, C2.
We attached the label on the battery. Each group of A1, A2 is used in series each time, and the B1, B2 of the group B is used in series, do not use the A1 and B2, or A1 and B1. This has the same cycle life in each cell, ensuring the consistency of the charge and discharge performance of each group, but also guarantees the safety of use.
If we use 100 cycles in the A group battery, the B group only uses one cycle. The A group battery is an old battery. After multiple cycles, the capacity is attenuated, the B battery is still a set of new batteries, capacity 100%, the battery capacity internal resistance of the AB group has a big difference, if the mix is likely to cause short battery life, even battery overlay.
Parallel use is also recommended to take the same way. .
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