What are the differences between series lithium battery and parallel battery

In today’s era, how should lithium batteries be accurately linked in series and parallel?

Why do people like to connect lithium batteries in parallel?

The main purpose is to increase the capacity of the battery. It can be seen from this point that when people compare the lithium battery in parallel with the single battery lithium battery, the lithium battery in parallel can show the same current design as the parallel lithium battery in the process of charging.

We can clearly know that the constant voltage is invariableness, can increase the battery capacity, reduce internal electric resistance, and can extend the time of power supply is the advantage of a parallel lithium battery. And the process of parallel charging is the most attention is the level of parallel lithium battery current and the impact of current. There is a famous theorem that states that the current of the main circuit is equal to the sum of the currents of all branches.

Therefore, according to this theorem, it can be inferred that the charging efficiency of parallel lithium batteries combined with many battery packs should be equivalent to that of a single-core battery. And the sum of the current of many lithium-ion batteries should be equivalent to that of single-cell batteries. So formula _ I=U / R can infer that this assumption is within the feasible range in real cases. But we must note that the internal resistance in parallel batteries is not fixed.

There is a situation where parallel resistance occurs when the sum of the internal resistance of two batteries and the total internal resistance of two parallel-connected lithium batteries are equal, and this number of parallel lithium battery is constantly will change. So that we can see that the sum of n parallel lithium batteries is greater than the current when we can complete their own lithium battery parallel charging efficiency.

Because parallel lithium battery has poor consistency, you should pay attention to this in the charging process. If you do not charge or charge for too long, these behaviors will lead to damage to the battery structure and reduce the service life of the battery.

From this point, we suggest that when you use parallel batteries, you should use the same brand, capacity, and old level of lithium batteries. Manufacturers on the market have a uniform consistency of battery use: lithium battery voltage difference of 10mV, internal resistance difference of 5m Ω, a capacity difference of 20mA.

The lithium battery has a charging protection chip, which is used to reduce the damage caused by lithium batteries when connected in parallel. Because considering the changing characteristics of parallel lithium batteries, lithium ion battery manufacturers have made corresponding measures when manufacturing parallel lithium batteries. So when people are for the integrity of the battery, users must charge the battery in accordance with the instructions.

One property of the series bulbs is that in the series circuit the voltage of the battery is equal to the sum of the voltages of each branch and a switch can control all the bulbs on a line.

After the batteries are connected in series lithium battery, the current is equal, the voltage is added, and the resistance increases; after the batteries are connected in parallel lithium battery, the voltage is constant (provided that the batteries can be connected in parallel lithium battery, otherwise it is easy to happen accidental danger), and the total current is equal to the sum of the current of each battery, so in general, we will think that increasing the capacity of the batteries can increase the current.

When the voltage rises, the stock of the battery is constant.


The respective characteristics of series lithium batteries and parallel batteries:

The series lithium battery:

The series lithium battery circuit is one next to one. In other words, the negative terminal of the second battery is next to the positive terminal of the first battery, the positive terminal of the second battery is connected to the negative terminal of the next battery, and the negative terminal of the fourth battery is next to the third battery, like this order is going to make more sense.

The total current is equal to the sum of the branch currents, and the overall voltage is equal to the sum of the series lithium battery voltages.

If one of the batteries is damaged during the process of use, the battery may be damaged or the voltage drops.

If the number of connections is in series lithium battery, the voltage can be reduced.


The parallel lithium battery:

The parallel lithium battery is where the positive electrode connects to the positive electrode, and the negative electrode connects to the negative electrode.

The voltage of each cell is equal to the voltage of each branch, and the corresponding current of each cell is equal to the current of each branch.

Although the battery age is advanced, the hurt originated by the short-circuit current is very grievous;

Parallel connection increases the total battery current.

The most common problem is that the battery does not provide a certain voltage or current. Because all of our batteries can be connected, we can solve this problem effectively. Battery series is that when all the batteries are connected, more power is generated to run a larger motor (voltage-v). Batteries in parallel lithium battery are that when all the batteries are connected, they generate more power to run an additional capacity (amp hour-Ah).

There is a common way to increase battery voltage —— to connect batteries in series.

for instance, if you connect a 12v, 10ah battery with a 12v, 10ah battery in series lithium battery, you will have a 24v, 10ah hair battery. This is a common way of battery wiring because the reality is that many electric motors in life are 24 volts.

Lithium battery and connection line can increase the running time of the battery at a charge. This is an obvious example of if two 12V, 10Ah batteries are connected by you at the same time, then this means you can get a 12 volt and 20 amp hour battery. This is a common way in people’s lives to make batteries that can use for a long time. This is mainly because many small electric motors and most home electronics use a voltage of 12 volts.

The way to increase the battery voltage, the way we do it now is basically to connect two or more batteries that can be connected together while being able to maintain the same number of amplification hours. You can’t discharge two different voltages and capacities together during the operation, otherwise, this will damage the life of the battery. And if you want to reach a certain voltage, you should correctly connect the positive electrode to the other negative electrode in the series lithium battery. If charging series batteries in daily life, do not use a mismatched charger, otherwise, it will cause problems between batteries and reduce life.

The battery pack is designed in such a way that multiple cells are connected in a series lithium battery and then this allows all voltages to be added to the terminals.

You can imagine having multiple batteries in serieslithium battery; each additional battery increases its terminal voltage. And so on, you can get the final voltage you want by adding the battery.

It is known that batteries can be composed not only in series lithium battery but also in parallel.

Whenever you reduce one battery, the total number of ampere-hours (Ah) will decrease accordingly. The battery of The BSLBATT B-LFP12V 12AH is typical.

Of the batteries in series lithium battery, must ensure that all the cells are the same voltage, if not the same, there are high and low, the strength of the battery is equivalent to the weakest battery, and the weak battery will not immediately have problems, but in the process of use, will be the first to deplete, and if the voltage will drop below 2.8v, easily below the safe level.

When charging, the same weak battery will be fully charged first, and will be overcharged, and is also prone to problems. Therefore, multiple batteries must be matched, especially when exposed to high impulse and discharge currents.

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In tandem cells, weak cells can lead to imbalance. This is especially important in a series configuration, this is because the strength of the battery pack is the same as the weakest cell, which makes it very susceptible to problems. Weak batteries may not fail immediately but may discharge faster than strong batteries (below safety level, 2.8 V per battery). During charging, weak batteries may be fully charged and overcharged (the voltage of each battery exceeds 3.9 V) before known good batteries. Unlike weak links in the chain, weak cells can put pressure on other healthy cells in the battery.


Battery Management System (BMS) Cell Protection

BMS continuously monitors the voltage of each battery. When the voltage of one battery exceeds the voltage of the other, the BMS circuit will try to reduce the charging level of the battery. Thus, the charging levels of all batteries remain the same even when the discharge (100 A or more) and the charging current (10 A or more) are high.

One charge (over-voltage) or over-discharge (drainage) may cause permanent damage to the battery. When the voltage exceeds 15.5 V (or the battery exceeds 3.9 V), BMS has a circuit to prevent charging. When the battery charge is less than 5% (over-discharge state), BMS will separate the battery from the load. Over-discharged battery voltages are typically less than 11.5 V (< 2.8 V per battery).


Multiple Batteries in Series and or Parallel (each battery with its own BMS)

Bslbatt’s 13.2 V pools can be used in series or in parallel for higher operation andor capacity for your specific. It is important to use the same pool model, size, and capacity (Ah), and never mix pools of different years.

Unless any other statement exists, BSLBATT batteries are approved for use in two series and two lithium batteries running in parallel without additional external electronics. This limitation applies to the impedance between different cells, and the capacity or self-discharge rate may be different. This restriction allows the normal replacement of one battery without adversely affecting other batteries.

In addition, the limit and action limit allow a battery to have abnormal conditions such as weak battery and faulty battery. It should be noted that for specific batteries, the evaluation is different when used within the series. For information about battery ratings, see the section “Maximum Safe Operating Limits”. (Best choice for solar panels – Lithium ion solar batteries)

A single battery can monitor the series connection of 8 batteries internally to ensure the balance of charging levels of all batteries, so using 26.4 V batteries instead of two 13.2 V batteries is the best choice.

The wires and connectors used to manufacture parallel series/lithium battery arrays must meet the desired current size.

Do not link the bslbatt series lithium batteries to other chemical batteries.

The parallel is to connect two or more batteries together, and the main purpose is to increase the time amplification capacity of the battery pack, but the voltage remains constant. To connect the battery in parallel, the positive is connected to one cable and the negative to another cable. Until the required capacity is reached.

Lithium batteries are not in parallel to allow batteries to power more beyond standard voltage output but to increase the battery life that can power the device. It should be noted that when charging lithium and parallel batteries, the charging time may extend as the capacity increases.

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