What is intelligent lithium battery?

1、 Background reasons for intelligent lithium battery

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


As for non-disposable batteries, which can be recharged, 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 have added an over-discharge protection circuit in the battery pack. When the discharge voltage drops to the preset voltage value, the battery stops supplying power to the outside. However, the actual situation is more complex. Therefore, the discharge cut-off of intelligent lithium battery is only the last line of defense for battery self-protection. Before that, the management circuit should 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 the traditional lithium-ion battery, additional detection equipment, such as a voltmeter, should be connected, and this detection cannot be carried out in real time during flight. Intelligent lithium-ion battery can be transmitted through digital image, and the voltage data can be transmitted back in real time, and even the voltage of battery pack can be viewed in APP. Record the battery history data, such as the number of usage, abnormal times, battery life, etc. Prompt for battery abnormality. It can prompt for 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 battery came into being. What is intelligent lithium battery? Let's take a look!


2、 What is intelligent lithium battery?


Intelligent lithium battery is in the development process of lithium battery. Because a single battery cell cannot meet the requirements of most portable electronic devices, it needs to be connected in series and in parallel to form a battery pack. It mainly depends on the capacity, voltage and discharge requirements of the battery to meet certain requirements of electronic devices.


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


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


Greep intelligent lithium battery


3、 Intelligent lithium battery composition

The structure of intelligent lithium battery is mainly divided into lithium cell, battery protection plate (bms), battery fixing bracket and wire.

Smart lithium battery is a general term. Because the type and brand of lithium battery used are different, the quality will be different, and the price will also vary greatly. This is the main reason why we see different prices of smart battery in the market. There are many kinds of battery cells used for intelligent lithium batteries, including polymer lithium cells, iron phosphate lithium cells, cobalt acid lithium cells, high nickel lithium cells, ternary lithium cells, etc. According to the properties of the same type of battery cells, the same type of battery cells can be divided into low temperature cells, high rate discharge cells, wide temperature cells and conventional discharge cells.

4、 Functions of intelligent lithium battery


1. The BMS of energy storage lithium battery has the function of analog quantity measurement: it can measure the voltage and temperature of the cell in real time, and measure the voltage and current at the end of the battery pack. Ensure the safe, reliable and stable operation of the battery, ensure the service life of the single battery, and meet the requirements for the operation optimization control of the single battery and battery pack.

2. Energy storage lithium battery BMS has online SOC diagnosis: on the basis of real-time data collection, expert mathematical analysis and diagnosis model is established to measure the SOC of the battery's remaining power online. At the same time, it intelligently corrects the SOC prediction according to the discharge current and ambient temperature of the battery, and gives the remaining capacity and reliable service time of the battery more in line with the changing load.

3. Operation alarm function of battery system: display and report alarm information in case of overvoltage, undervoltage, overcurrent, high temperature, low temperature, abnormal communication, BMS and other conditions in battery system operation.

4. Battery system protection function: for abnormal fault conditions such as serious overvoltage, undervoltage, overcurrent (short circuit) of the battery that may occur during operation, the high-voltage control unit is used.

5. The energy storage lithium battery BMS has the communication function: the system can communicate with the PCS through CAN. The communication protocol supports the Ankeri PCS communication protocol, and the RS485 mode is used to communicate with the background. The communication protocol is the standard Modbus protocol.

6. Thermal management function: strictly monitor the operating temperature of the battery pack. If the temperature is higher or lower than the protection value, the battery management system will automatically cut off the battery circuit to ensure system safety.

7. The energy storage lithium battery BMS has self-diagnosis and fault tolerance functions:

8. Equalization function: passive equalization, the maximum equalizing current is 200mA.

9. Operation parameter setting function;

10. Local operation status display function;

11. The energy storage lithium battery BMS has the function of event and log data recording.