source:other news
release time:2023-09-14
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In fact, when we purchase batteries, we often see batteries with higher voltages than 4.2V or other cells, such as 6V, 12V, 24V, etc. However, many of the lithium batteries we use have voltages of over ten volts. What's the problem?
In fact, regardless of the voltage of the battery in the market, as long as it is 6V or above, it is achieved through the series connection of lithium cells, and the size of the capacity is achieved through the three parallel connection methods of the cells. For example, let's briefly introduce a lithium battery with a capacity of 20000 mAh and a 24V voltage.
If it uses a polymer lithium battery with a nominal voltage of 3.7V and a full charge voltage of 4.2V, and a single cell capacity of 5000mAh, how many cells does it need to be connected in series or in parallel? If 24 divided by 3.7 equals 6.5, then 7 cells need to be connected in series to achieve the required voltage. Then, four sets of identical series cells need to be connected in parallel to achieve a capacity of 20000mAh. Therefore, a total of 7 multiplied by 4 equals 28 cells.
So what is the voltage range of the lithium battery combined in this way
You may think:
The full charge voltage is 4.2V × 7=29.4V
The nominal voltage is: 3.7V × 7=25.9V
The termination voltage is: 3.2V × 7=22.4V
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