Batteries in parallel vs series comparison

Batteries in parallel vs series – a detailed comparison

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When cells are made into a battery pack, the most common way to connect them is in series and parallel. So people might wonder what is the difference between batteries in parallel vs series? This article compares batteries in parallel vs series in detail in terms of advantages and disadvantages, security, lasting, etc., and answers related FAQs to help people know more and choose the right connection methods.

Batteries in parallel vs series

When batteries are in series and in parallel what happens?

When batteries are in series, the total battery voltage of each battery are adding up. The series connection carries out voltage addition. On the contrary, When batteries are connected in parallel, this adds to the total amp hour capacity of all batteries.

What are the advantages of batteries in series or parallel?

Connecting batteries in parallel or series are guided by needs.

■ Main advantages of batteries in series:
The main advantage of connecting batteries in series is that it get a higher voltage output. In some cases, when matching lithium batteries with larger overall energy according to demand, if the number of batteries in series is larger and the lithium ion battery voltage is higher, then the capacity can be selected with relatively lower specifications, and the current will be reduced accordingly. In this way, high current is avoided and the safety performance is better.

■ Main advantages of batteries in parallel:
On the other hand, parallel connection offers more capacity. Parallel connection system continues working even if you lose a battery. 

Batteries in parallel vs series-disadvantages of each connection?

■ Main disadvantages of batteries in parallel:
The voltages remain constant in a parallel system.Due to the higher currents in this connection, you need to use lower gauge wires leading to a higher voltage drop. It is also more difficult for fault detection.

■ Main disadvantages of batteries in series:
When you lose one battery in series, then the whole battery system is finished. Another disadvantage is that the series connection does not have increased capacity of the battery system..

How to wire batteries in parallel and series?

Wiring a battery in series vs parallel you need to do the following:
How to wire batteries in parallel and series

● In parallel wiring, connect the positive of the external circuit to the positive terminals of the batteries and the negative of the external circuit to the negative battery terminals.

● In a series connection, the positive terminal of one battery is connected to the negative terminal of the next battery in an in-out method until the last battery negative is connected to the positive terminal of the first battery. The choice between batteries in parallel vs series should be guided by power demand in the application scenario.

Batteries in series-parallel connection

In the case of connecting batteries in series-parallel, a group of batteries is first wired in series and another group is wired in parallel, and finally, the two groups are interconnected. This method brings out the benefits of the two systems. This produces both a higher voltage and capacity.

Difference between series, parallel and series-parallel connection

The difference between series and parallel and series-parallel batteries connection is as follows and arises from the comparison of the batteries in parallel vs series. The voltage of the series system is the sum of all voltages.The series connection is shown in the diagram below.

battery series connection

The parallel battery connection is displayed below.

parallel battery connection

In a series-parallel connection, it connect two batteries in series and then connect the series sets in parallel. This connection totals both voltages and capacities of the sets.

Batteries in parallel vs batteries in series-which is better?

Do batteries last longer in series or parallel connection?

In choosing which batteries in parallel vs series last longer, it is the parallel batteries because capacity is higher.

Is it better to have batteries in series or parallel?

As mentioned earlier, there is a corresponding increase in voltage or capacity when the battery cells are connected in series or parallel, and both connection systems have advantages and disadvantages. When comparing the batteries in parallel vs in series, however, there isn’t an accurate answer to who is better.

Depending on the specific requirements, some applications or electrical equipment may require higher voltages, while others may require higher capacity to ensure duration. If it’s for more voltage, then series is the correct approach but for more capacity, parallel is the right approach. However, batteries connected in either system should be of the same capacity, rating, and voltage. When wiring batteries in series vs parallel, it should be noted the series system uses higher gauge wires.

Is it better to charge batteries in series or parallel?

It is better to charge batteries in series because they take a shorter period to charge if you have a variable power source. Parallel charging of the battery increases the current and may lead to overheating.At the same time, it is necessary to pay attention to whether the capacity pf original charger is enough when charging in parallel, otherwise it will be hot.
Is it better to charge batteries in series or parallel

Which is safer? Series or parallel?

The series system is less prone to heating and fire risk while the parallel system is more prone to fire issues as it is complex and uses more power and high current.

What kind of application do we need series or parallel batteries for?

If you have batteries of the same voltage value but require a higher voltage battery source, then Use series and use parallel when you need higher capacities and lastly use series-parallel when you need both high voltage and capacity.

For example,  the application scenario of electric motorcycle requires the battery to not only provide enough power to enable the tire to rotate quickly, but also to have a long endurance. Therefore, the voltage and capacity of electric motorcycle battery pack need relatively high level, so it is better to choose series-parallel connection. And the dest choice is the large capacity batteries in series, which is safer and easier to manage cells. Like the motorcycle battery from TYCORUN ENERGY, specifically for battery swap stations, is made up of 20 3.6v 50ah nmc cells in series.

FAQs about batteries in parallel vs series

As many as you can theoretically if you are wiring batteries in parallel. The problem however arises due to the fact that The prerequisite is that the battery that needs to be connected in parallel has the same voltage and chemical composition, and preferably the same capacity and current.

Match them, through use of batteries with the same voltage and capacity, type, and age.For lithium-ion batteries, its built-in smart BMS can conduct a balanced management of the battery.

No. This draining is guided by battery internal resistance, exact voltage, (as the voltages may have a small difference), and the loads. This is one factor that may influence your choice of batteries connected in series vs parallel.

In theory, this can be done as long as the voltage and the battery type are the same, but it is not recommended that there is a safety risk.When you choose connecting batteries in parallel vs series, for charging in parallel, the 12V 100Ah battery will overcharge whereas the 12V 200Ah battery will undercharge. This will lower the lifespan of batteries. During discharge, the 12V 100Ah battery will undercharge and go into reverse polarity.

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