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Parallel connection of batteries requires the same capacity and voltage, and it is not allowed to connect new and old batteries in parallel. After parallel connection, the maximum output current that the battery can provide will double, but the current generated by the motor during use will not increase due to the increase in battery capacity, so there is no need to change it.

The use of lithium batteries in series and parallel may sound simple, but it is necessary to follow some simple rules to avoid unnecessary problems.

Do not mix different brands of lithium batteries, different capacities, or old and new lithium batteries together, choose batteries with consistent performance. When the battery is low, replace all batteries. When using lithium batteries in series, the same type of battery should be used. Pay attention to the polarity of the battery. If the polarity of one battery is reversed, it will reduce the voltage of the entire series of batteries instead of increasing the voltage.

If different capacities or new and old lithium batteries are mixed together for use

Using lithium batteries in series and parallel may sound simple, but it is necessary to follow some simple rules to avoid unnecessary problems.

Do not mix different brands of lithium batteries, different capacities, or old and new lithium batteries together, choose batteries with consistent performance. When the battery is low, replace all batteries. When using lithium batteries in series, the same type of battery should be used. Pay attention to the polarity of the battery. If the polarity of one battery is reversed, it will reduce the voltage of the entire series of batteries instead of increasing the voltage.

If different capacities or new and old lithium batteries are mixed together for use, there is a possibility of leakage, zero voltage, and other phenomena. This is because during the charging process, capacity differences result in some batteries being overcharged, some batteries not fully charged, and high capacity batteries not fully discharged during discharge, while low capacity batteries are over discharged. In such a vicious cycle, the battery is damaged and leaks liquid or has a low (zero) voltage.

The general use of lithium batteries in series and parallel requires pairing of lithium battery cells. The pairing standards are: voltage difference of lithium battery cells ≤ 10mV, internal resistance difference of lithium battery cells ≤ 5m Ω, and capacity difference of lithium battery cells ≤ 20mA.

② Repair/replace faulty components.

The first type is two strings and two parallels.

What should be noted in the design of Li battery protection board using this method. The doubts are as follows:

Firstly, two LI batteries are connected in series to form a 7.4V battery pack, and a protective board is added (the protective chip required for this board needs to be 7.4V, please recommend). Then, the two 7.4V batteries are connected in parallel. Is this method feasible? If so, can they be directly connected in parallel, or does an additional protective board need to be added.

If that's too troublesome, it feels like. Can a protective board be added when connected in series, and an additional protective board be added when the battery pack is connected in parallel.

The second type is two parallel and two string.

What should be noted in the design of Li battery protection board using this method. The doubts are as follows:

Firstly, two LI batteries are connected in parallel to form a battery pack, and a protective plate is added. Then, the two 3.7V batteries are connected in series. Is this method feasible? If so, can they be directly connected in series, or does an additional protective plate need to be added.

If that's too troublesome, it feels like. Can a protective board be added when the battery pack is connected in series instead of parallel connection.

Connecting and paralleling power lithium batteries may sound simple, but following some simple rules can avoid unnecessary problems. A lithium battery pack consists of two parts: a lithium battery and a lithium battery protection circuit.

In a lithium battery pack, multiple lithium batteries are connected in series to obtain the required operating voltage. If higher capacity and greater current are required, then the power type lithium batteries should be connected in parallel first. The combination of series and parallel methods can achieve high voltage and high capacity standards. For example, for a 36V10AH electric vehicle, 50 2000MAH 3.6V lithium-ion batteries are connected in parallel to achieve a capacity of 10AH; Then connect 10 parallel batteries in series together; After being connected in series, the voltage of the battery can reach 36V or above {fully charged 42V}

This connection method is called "10 series 5 parallel", which means: connecting 10 sets of lithium batteries consisting of 5 parallel sections in series; The nominal voltage of lithium-ion batteries is 3.6V. The rated voltage of lithium-ion polymers and other types of lithium batteries is generally 3.7V. Another issue with using high-voltage battery packs is the possibility of encountering a failure of one of the batteries in the pack. This is like a chain, the more batteries connected in series, the higher the probability of this situation occurring. As long as there is a problem with a battery, its voltage will decrease. At the end, a disconnected battery may interrupt the delivery of current. Replacing "bad" batteries is also an easy task, as new and old batteries do not match each other. Generally speaking, the capacity of new batteries is much higher than that of old batteries. As the working voltage decreases, it reaches the critical point of discharge faster than a normal battery pack, and its usage time also sharply shortens. Once the device is cut off due to low voltage, the remaining individual batteries that are still intact cannot deliver the stored power. At this point, the faulty battery still exhibits significant internal resistance. If there is still a load, it will cause a significant decrease in the output voltage of the entire battery chain. In a series of batteries, a poorly performing battery, like a plug blocking a water pipe, creates a huge resistance that prevents the flow of current. Other batteries will also short-circuit, which will cause the terminal voltage to drop to 3.6V or disconnect the battery pack link and cut off the current. The performance of a battery pack depends on the performance of the worst battery in the battery pack.

To obtain more power, multiple batteries can be connected in parallel. Another method, besides connecting the batteries in parallel, is to use larger batteries. Due to the limitations of the available batteries, this method is not suitable for all usage situations. In addition, large-sized batteries are not suitable for the appearance specifications required for specialized batteries. Most chemical batteries can be used in parallel, and lithium-ion batteries are most suitable for parallel use. For example, a battery pack composed of 5 batteries in parallel maintains a voltage of 3.6V, while the current and operating time increase by 5 times. Compared to series connected batteries, high impedance or "open circuit" batteries have less impact in battery parallel circuits. However, parallel battery packs will reduce load capacity and shorten operating time. This is like an engine only starting three cylinders. The damage caused by a short circuit in a circuit will be greater because a faulty battery during a short circuit will quickly deplete the power of other batteries, causing damage to the entire battery life

When using the series parallel connection method, it is very flexible in design and can achieve the required rated voltage and current using standard battery sizes. It should be noted that the total power will not change due to different connection methods of the battery. Power is equal to voltage multiplied by current. For lithium-ion batteries, series parallel connection methods are common. The most commonly used type of battery pack is the 18650 lithium battery, which comes with a protective circuit called a lithium battery protection board. The lithium battery protection board can monitor each battery connected in series, so its maximum actual voltage is 42V. This lithium battery protection circuit (i.e. lithium battery protection board) can also be used to monitor the status of each battery connected in series. When using 18650 lithium batteries in series, the following basic requirements must be followed: the voltage must be consistent, the internal resistance difference should not exceed 5 milliohms, the capacity difference should not exceed 10 milliamperes, and the connection points of the battery should be kept clean. Each connection point has a certain resistance. If the connection points are not clean or added, the internal resistance may be high, which may affect the performance of the entire battery pack. Do not mix lithium batteries from different manufacturers. Instead, choose lithium batteries with high performance consistency. Battery packs made from lithium batteries should be selected according to the above standards, which are basically up to standard complete! If there is anything you said that is not accurate, please add it in a timely manner... Thank you!

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