The relationship between lithium battery packs and lithium battery packs. For this topic, readers who may not know much about lithium batteries may think that this article is about the similarities between lithium battery packs and lithium battery packs. However, Xiaobian It can only be regrettable that this conjecture is wrong, because the lithium battery pack contains a lithium battery pack. Therefore, what this article describes is the lithium battery pack containing the lithium battery pack.
About the definition of lithium battery pack
The lithium battery pack consists of three parts: the battery core, the protection board and the outer casing.
The battery core is composed of a lithium battery pack, and the protection board is for charging and discharging protection of the series lithium battery pack; when fully charged, the voltage difference between the single cells can be ensured to be less than a set value (generally ±20 mV). The equalization of each battery of the battery pack effectively improves the charging effect under the series charging mode; at the same time, detects the overvoltage, undervoltage, overcurrent, short circuit, over temperature state, protection and extension of each single battery in the battery pack Battery life; undervoltage protection prevents each single cell from being damaged by overdischarge during discharge.
Lithium battery packs are made of two different materials, such as aluminum and steel, which are soft and hard. But nowadays, soft-packed lithium batteries are favored by manufacturers.
Lithium battery pack
There are parallel and series circuits in the lithium battery cells. Because of the difference in capacity, internal resistance, attenuation characteristics, self-discharge, etc. between the single lithium batteries due to the simple series circuit, when charging the lithium battery pack in series .
The single-cell lithium-ion battery with the smallest capacity in the battery pack will be fully charged first. At this time, the other lithium batteries are not fully charged. If the series charging is continued, the fully charged single-cell lithium battery may be charged.
Lithium battery overcharge will seriously damage the performance of the battery, and may even cause explosions and deaths. Therefore, the lithium battery pack in the lithium battery pack uses a combination of parallel and series to ensure the safety and charging of the lithium battery pack. More electricity.
Lithium battery pack battery safety guarantees in addition to the combination of parallel and series circuits and battery management system and charger. Battery management system is the most comprehensive understanding of battery performance and status, so the battery management system Establishing a connection with the charger allows the charger to know the battery information in real time, thereby more effectively solving some problems when the lithium battery pack is charged.
Battery management system and charger coordinate the charging principle of lithium battery pack in charging mode
The battery management system transmits the parameters of the total voltage, the highest single cell voltage, the highest temperature, the temperature rise, the maximum allowable charging voltage, the maximum allowable cell voltage, and the maximum allowable charging current to the charger in real time, and the charger can be based on the battery. The information provided by the management system changes its own charging strategy and output current.
When the maximum allowable charging current provided by the battery management system is higher than the current capacity of the charger design, the charger is charged according to the designed maximum output current;
When the battery voltage and temperature exceed the limit, the battery management system can detect and notify the charger to change the current output in real time;
When the charging current is greater than the maximum allowable charging current, the charger starts to follow the maximum allowable charging current, thus effectively preventing the battery from being overcharged and achieving the purpose of prolonging the battery life.
In the event of a fault in the charging process, the battery management system can set the maximum allowable charging current to 0, forcing the charger to stop, avoiding accidents and ensuring the safety of charging.
The lithium battery pack battery is the most important part of the lithium battery pack. After all, the battery core is the core of the storage power and output power, and the lithium battery pack is just a kind of lithium battery shell packaging.
