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Analysis of lithium iron phosphate battery charge management chip and protection chip. With the widespread use of lithium iron phosphate batteries, the demand for battery capacity of some products is constantly increasing, so it is necessary to connect multiple lithium ion batteries in series, which leads to the increase of the total voltage of the battery, and thus leads to the birth of a lithium ion battery charge management chip. In order to prevent the lithium ion battery from being damaged by abnormal conditions such as overcharge, over-discharge and over-current, the lithium ion battery protection device is usually used to prevent the battery from being damaged by abnormal conditions.

Analysis of lithium iron phosphate battery charge management chip

Lithium iron phosphate battery has relatively active characteristics and high requirements for voltage and current, so lithium ion battery management chip is required. The lithium iron phosphate battery management chip is designed to protect the circuit of the battery, which can protect the battery from over-discharge, over-voltage, overcharge and over-temperature, and can effectively protect the life of the lithium ion battery and the safety of the user.

With the widespread use of lithium-ion batteries and the increasing demand for battery capacity of some products, it is necessary to connect multiple lithium-ion batteries in series, which leads to the increase of the total voltage of the battery. Therefore, the lithium iron phosphate battery charge management chip was born, which will automatically pre-charge, constant current charge and constant voltage charge according to the characteristics of the lithium iron phosphate battery.

Types of lithium iron phosphate battery charge management chips

1、SL1053

Linear lithium iron phosphate battery chip SL1053, SL1053 is a circuit specially designed for high-precision linear lithium ion battery charger, which is very suitable for those low-cost, portable chargers.

2、TP4056

TP4056 is a complete single lithium-ion battery with constant current/constant voltage linear charger. The SOP8 package with heat sink at the bottom and a small number of external components make the TP4056 an ideal choice for portable use. TP4056 can work with USB power supply and adapter power supply.

3、HL7016

HL7016 is the first 12V high-voltage input fully integrated switch-mode charger in China, realizing the high input voltage, USBOTG boost mode and I2C interface programmable. The chip has built-in voltage, current, temperature and other test and protection functions. The voltage and current parameters are set and adjusted through the I2C interface to ensure the charging safety of lithium iron phosphate battery.

4、CS0301

CS0301 is a high-precision intelligent lithium iron phosphate battery charge management chip with full functions, low price, high integration, simple external circuit and convenient adjustment.

5、LTH7

LTH7 is a complete single lithium-ion battery with constant current/constant voltage linear charger. Its SOT package and small number of external components make the PL4054 an ideal choice for portable use.

The lithium iron phosphate battery charge management chip has a clear purpose for extending the battery life, because with the charge and discharge chip, the voltage and current are controllable, which can effectively control the charging state of each stage of charging. For lithium-ion batteries, the battery management chip has various performances of battery charging and discharging, such as constant voltage mode, constant current mode, etc. These charging modes are beneficial to the battery, and the most important point is relatively safe.

Lithium iron phosphate battery protection chip

When a group of lithium iron phosphate batteries are charged in series, each battery should be charged evenly, otherwise the performance and life of the whole battery will be affected during use. However, the existing single lithium-ion battery protection chip does not contain the equalizing charge control function, and the equalizing charge control function of the multi-section lithium-ion battery protection chip should be connected to the external CPU; Through serial communication with the protection chip, it increases the complexity and design difficulty of the protection circuit, reduces the efficiency and reliability of the system, and increases the power consumption.

The lithium iron phosphate battery still needs to be protected. When a group of lithium ion batteries are charged in series, each battery should be charged evenly, otherwise the performance and life of the whole battery will be affected during use. Based on the design method of the equalizing charging protection board of the lithium iron phosphate battery pack, the commonly used equalizing charging technologies include constant shunt resistance equalizing charging, on-off shunt resistance equalizing charging, uniform battery voltage equalizing charging, switch capacitor equalizing charging, buck converter equalizing charging, inductance equalizing charging, etc.

Application of lithium-ion battery protection chip

Analysis of important components in the working principle of lithium iron phosphate battery protection chip:

1. IC: It is the core of the protection chip. First, it samples the battery voltage, and then sends out various commands through judgment. MOS tube: it plays an important role in switching

2. The protection chip works normally: the MOS tube on the protection chip may be in the off state at the beginning. After the lithium iron phosphate battery is connected to the protection chip, the MOS tube must be triggered first, and the output voltage at the P+and P - terminals is available. The common method of triggering is to use a wire to short circuit B - and P -.

3. Protection chip overcharge protection: connect a power supply higher than the battery voltage on P+and P -, the positive pole of the power supply is connected to B+, and the negative pole of the power supply is connected to B -. After the power supply is connected, the battery starts to charge. The current direction of I1 as shown in the figure starts from the positive pole of the power supply and flows through the battery, D1, MOS2 to the negative pole of the power supply. The IC samples the battery voltage value through the capacitor. When the battery voltage reaches 4.25v, the IC sends a command to make the pin CO low level, At this time, the current starts from the positive pole of the power supply, flows through the battery, D1, and reaches MOS2. Because the gate of MOS2 is connected to CO, it is also low level, MOS2 is turned off, and the whole circuit is turned off, and the circuit plays a protective role.

4. Protection chip over-discharge protection: after connecting a suitable load to P+and P -, the battery starts to discharge its current direction, such as I2, and the current flows from the positive pole of the battery to the negative pole of the battery through load, D2, MOS1 (at this time, MOS2 is short-circuited by D2); When the battery is discharged to 2.5v, the IC samples and sends a command to let MOS1 cut off, the circuit is disconnected, and the battery is protected.

The above is the analysis of lithium iron phosphate battery charge management chip and protection chip. The lithium-ion battery protection chip is designed to protect the safety of the battery, that is, to guard against the explosion of overcharged battery and the easy damage of overcharged battery. I hope this article can help you.

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