Set up the lithium battery protection circuit -Lithium - Ion Battery Equipment

Set up a safe lithium battery protection circuit -Lithium - Ion Battery Equipment

How to Build a Safe Li-Ion Battery Protection Circuit

According to statistics, the global demand for lithium-ion batteries has reached 1.3 billion, and with the expansion of the scope of use, this number is increasing year by year. Because of this, with the rapid increase in the use of lithium-ion batteries in all walks of life, the safety functions of batteries are becoming more and more prominent. Not only are lithium-ion batteries required to have good charging and discharging functions, but they are also required to have higher safety. Function. Why did the lithium-ion battery catch fire or even burst, and what are the ways to prevent and cure it?

The explosion of the notebook battery is not only related to the production process of the lithium-ion battery used in the battery, but also to the battery maintenance board packaged in the battery, the charge and discharge processing circuit of the notebook, and the heat dissipation plan of the notebook. The unreasonable heat dissipation planning and charging and discharging treatment of the notebook computer will make the battery overheat, which will greatly increase the activity of the battery and increase the probability of explosion and burning.(Lithium - Ion Battery Equipment)

Data composition and functional analysis of lithium-ion batteries

First of all, we will understand the composition of lithium-ion battery data. The function of lithium-ion battery is mainly determined by the use of the internal data structure and function of the battery. These battery data include negative data, electrolyte, separator and positive data. Among them, the choice of positive and negative data and the quality of the lithium-ion battery directly determine the function and price of the lithium-ion battery. Therefore, cheap, high-performance positive and negative data has always been the focus of the lithium-ion battery business.

The negative data is generally carbon data, which is relatively old now. The development of positive data has become an important factor restricting the further development of lithium-ion battery functions and the further decline in prices. In the current commercial production of lithium-ion batteries, the cost of cathode information accounts for about 40% of the total battery cost, and the price of cathode information directly determines the price of lithium-ion batteries. This is especially true of lithium-ion batteries. For example, a small mobile phone lithium-ion battery only needs about 5 grams of positive data, while a lithium-ion battery powering a bus may need as much as 500 kilograms of positive data.

Although it can theoretically be used as the negative electrode data of various lithium ion batteries, the common important component in the negative electrode data of lithium ion batteries is LiCoO2. When charging, the potential on the north and south sides of the battery forces the positive compound to release lithium ions, and the negative molecules intercalate into the laminar structure of the carbon. During discharge, lithium ions detach from the layered carbon and recombine with positively charged compounds. The movement of lithium ions produces an electric current. This is how lithium-ion batteries work.

Li-ion battery charge and discharge treatment planning

When a lithium-ion battery is charged, the potential at the north and south poles of the battery forces the compounds of the positive electrode to release lithium ions, which are embedded in the carbon sheet structure of the negative electrode molecules. During discharge, lithium ions detach from the layered carbon and recombine with positively charged compounds. The movement of lithium ions produces an electric current. The principle is simple, but in actual industrial production, there are more practical issues to consider: the data requirement of the positive electrode requires additives to maintain repeated charging activities, and the data requirement of the negative electrode is planned to contain more lithium ions at the molecular structure level; positive The electrolyte between the negative electrodes must not only be stable, but also have good electrical conductivity to reduce the internal resistance of the battery.

Although the lithium-ion battery has various advantages mentioned above, it is a relatively high maintenance requirement for the circuit. In the process of use, the phenomenon of excessive charging should be strictly prevented, excessive discharge, and the discharge current should not be too large. Generally In other words, the discharge rate should not exceed 0.2c. The charging process of a lithium-ion battery is shown in the figure. During the charge cycle, lithium-ion batteries test the battery's voltage and temperature before charging to determine if it can be charged. If the battery voltage or temperature exceeds the manufacturer's allowable limit, stop charging. 



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