What is an intelligent lithium battery?

、 Background of intelligent lithium battery

At present, lithium-ion batteries have become popular in the market, and a large number of lithium-ion battery packs have adopted the form of multi cell series and parallel. Due to the individual differences of cells, it is impossible to achieve 100% balance between charging and discharging, so a complete set of charging management system is particularly necessary. This is the second function that intelligent lithium-ion batteries should have - complete charge management and discharge management of lithium-ion battery packs.

For non disposable batteries, rechargeable batteries, excessive discharge is the most annoying thing. Excessive discharge means that the battery performance is degraded or even scrapped; In order to prevent over discharge, people added an over discharge protection circuit in the battery pack. When the discharge voltage drops to the preset voltage, the battery stops supplying power to the outside. However, the reality is more complex. Therefore, the discharge cut-off of intelligent lithium battery is only the last line of defense for battery self-protection. Before this, the management circuit shall calculate the terminal life and provide early warning for users, so that users have enough time to take corresponding safety measures.

In order to detect the voltage of traditional lithium-ion battery, additional detection equipment, such as voltmeter, should be connected, and such detection cannot be performed in real time during flight. The voltage data of intelligent lithium ion battery can be transmitted back in real time through digital image transmission, and even the voltage of battery pack can be viewed in APP. Record battery historical data, such as usage times, abnormal times, battery life, etc. It can prompt various battery abnormalities, such as short circuit, excessive charging current, high voltage, high temperature, low temperature and other functions. In order to meet these functions, intelligent lithium batteries came into being. What are intelligent lithium batteries? Let's take a look at them together!

2、 What is an intelligent lithium battery?

In the development process of lithium battery, intelligent lithium battery can not meet the use requirements of most portable electronic devices because a single cell can not meet the requirements of most portable electronic devices. It needs to be connected in series and in parallel with multiple cells to form a battery pack. The battery can meet certain requirements of electronic devices mainly in terms of capacity, voltage and discharge requirements.

However, due to certain numerical errors in capacity, voltage, internal resistance and other aspects between lithium battery cells, that is, different sizes, the stability of the battery cells will be prone to failure. In order to improve the working stability between the cells, so the battery management system BMS came into being.

The BMS system can coordinate the tolerance, pressure difference, internal resistance difference and other aspects between each cell in the intelligent lithium battery to maximize the working efficiency of the battery pack and extend the working life of the battery.

3、 Composition of intelligent lithium battery

The structure of intelligent lithium battery can be divided into lithium battery cell, battery protection board (bms), battery fixing bracket and wire.

Smart lithium battery is a general term. Because the types and brands of lithium battery cells used are different, the quality and price will vary greatly. This is the main reason why we see different prices of smart batteries in the market. There are many types of battery cells used as intelligent lithium batteries. According to the types, they mainly include polymer lithium battery cells, lithium iron phosphate battery cells, lithium cobalate battery cells, high nickel lithium battery cells, ternary lithium battery cells, etc. According to the properties of similar battery cells, the same type of battery cells can be divided into low temperature battery cells, high rate discharge battery cells, wide temperature battery cells, and conventional discharge battery cells.