Parallel connection: Several batteries, the positive electrode and the positive electrode, the negative electrode and the negative electrode are connected together side by side, the voltage remains unchanged, the capacity increases, and the corresponding current also increases.

Serial connection: Several batteries are connected in series, that is, the positive electrode and the negative electrode. The negative electrode of the first battery is connected to the positive electrode of the second battery, and so on. The voltage increases, the capacity does not change.

Generally, a 3.7V lithium battery needs an overcharge and overdischarge protection circuit board. If the battery does not have a protection board, it can only be charged with a voltage of about 4.2V, because the ideal full charge voltage of the lithium battery is 4.2V, and the voltage may be damaged if it exceeds 4.2V. The battery is charged by this method and the battery status needs to be monitored at all times.

At present, whether the battery is a lithium iron phosphate battery, a ternary battery, or a lithium titanate battery can not be separated from the battery protection circuit board, someone asked why use a protection board? Wouldn't it save a lot of money not to use a protective plate? Customers who think this way are not surprised, because they do not understand lithium batteries, do not understand the characteristics of the battery, if you understand the lithium battery, you will feel that this money can not be saved, this is the last line of defense to ensure the safety of battery products.

How many model names does the lithium battery have? In fact, it's not clear at this time, because each battery manufacturer has its own model specifications and some custom battery models. The following introduces the name of the lithium-ion battery model and the meaning of the letters and numbers on the battery, so that everyone can better understand the battery model specifications.

At present, most of electronic products use lithium-ion batteries, and a few years ago, electronic products mostly used nickel-cadmium batteries. These two batteries have different memory effects. The so-called memory effect means that during the first few charges, if it stops before being fully charged, the battery will remember the previously charged capacity when charging in the future.

Lithium-ion batteries are chemical batteries that use lithium as the negative electrode active material. The standard electrode potential of lithium is the most negative, the lightest in the metal, and the most reactive, so the lithium-ion battery has a high electromotive force and specific energy, which is an important high-energy battery.

The working principle of lithium battery discharge, what is the cut-off voltage? The termination voltage of lithium battery discharge means that after the lithium battery is discharged to a certain voltage, it should not be continued to discharge, otherwise it will cause irreversible loss of some of the lithium battery ’s power and serious damage to the battery. The nominal voltage of a single lithium battery is generally 3.7V, and the termination voltage is 2.75V.

Batteries can reach the desired operating voltage when there is a connection of several cells in series; Each of the cells will add its voltage potential to obtain the total voltage required across the terminals. On the other hand, the parallel connection brings about a higher capacity by simply adding the total amp-hour (Ah) of all cells involved.

Inconsistent lithium battery packs mainly refer to inconsistent parameters of capacity, internal resistance, and open circuit voltage.

UL is an independent product safety certification organization which, in conjunction with other organizations and industry experts, publishes consensus-based safety standards.  For lithium batteries, key standards are: UL 1642 (Lithium Batteries) – This standard is used for testing lithium cells.  UL2054 (Household and Commercial Batteries) – For lithium batteries, Battery packs tests are covered by UL 2054.