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.
Why does the lithium ion battery capacity loss? Can the power loss of the lithium ion battery be repaired?
Lithium-ion batteries are the driving force of electronic products. If the battery consumption of electronic products is too large, the battery life of electronic products will be greatly reduced. Many users complain that the battery life of their electronic products is too short. If they are used for a long time, the battery life of the lithium-ion batteries of electronic products will be relatively weakened. The common problem of lithium-ion batteries in daily use is power loss. The more exhausted, the greater the battery loss.
The impact of high temperature on lithium-ion batteries, is high temperature the cause of bulging lithium-ion batteries?
Among all environmental factors, temperature has the greatest influence on the battery's charge and discharge performance. The electrochemical reaction at the electrode / electrolyte interface is related to the ambient temperature. The temperature rise means that the output power of the lithium ion battery will rise. The temperature also affects the transfer speed of the electrolyte. The temperature rises faster, the transfer temperature decreases, and the transfer slows down. The battery charge and discharge performance will also be affected. However, if the temperature is too high above 45 ° C, the chemical balance in the battery will be destroyed, causing side reactions.
The following uses a lithium ion battery with a standard voltage of 4.2V as an example
If the voltage is 4.2V after full charge, it is ok. If the battery time is more than 0.7 times of the new battery, it means the battery is not bad. If the volume voltage is higher than 4.2V after full charge, it means that the charger has problems. (Note The voltmeter must be accurate). Please see the introduction below.
Lithium batteries are widely used in people's lives, such as digital products such as cameras and notebook computers, as well as some other electrical appliances.
Tips for safe transportation of lithium batteries:
Lithium-ion batteries will face the risk of excessive self-discharge during long-term storage, especially at lower open-circuit voltages. Due to excessive self-discharge, the voltage of the lithium-ion battery may be too low, causing negative and negative copper foils dissolution and other risks, because the dissolved copper element will be precipitated on the surface of the negative electrode again during the charging process, the generated metal copper dendrites may pierce the separator, causing a short circuit between the positive and negative electrodes, so excessive discharge or low voltage will cause lithium The ion battery completely failed.
If you want to guarantee the product quality of lithium battery cells, you must ensure that the production equipment for producing lithium battery cells runs well.
There are many steps in the production of lithium battery cells, and there are many production-related equipment. Here we will introduce the main steps and equipment of the cell production process:
The 18650 lithium-ion battery pack is a finished lithium-ion battery assembled by different numbers of 18650 li-ion batteries through a protective circuit board. The most important part of the 18650 lithium battery is: 18650 cells, protection circuit board (commonly called PCM board) and battery assembly process production line.
It has been half a century since the first commercial lithium battery was released by Sony in 1991. Lithium batteries are closely related to our daily life and are inseparable. They are widely used in various electronic products. In order to protect the rights and interests of consumers, the safety of products More and more attention is being paid to it; the safety of the battery bears the brunt. At present, the safety certification of lithium batteries in all countries is quite strict, and many countries are mandatory certification tests.