What are the specific requirements for the design of the 12v lithium battery protection circuit?

12V lithium battery is a commonly used standard for mobile energy storage power supplies. Usually 3 strings of lithium ion batteries or 4 strings of lithium iron phosphate batteries are used. Energy storage batteries usually require high energy density and large capacity, so the conventional capacity is Range from 40Ah to 300Ah. Because of the high energy density of this type of 12v lithium battery, in the overcharged state, the energy will be excessive after the battery temperature rises, so the electrolyte decomposes and gas appears, which is likely to increase the internal pressure and cause spontaneous combustion or rupture ; On the contrary, in the over-discharged state, the electrolyte will decompose and cause deterioration of battery characteristics and durability, reducing the number of rechargeable times and shortening the battery life. Therefore, the protection of lithium batteries is very important. The 12v lithium-ion battery protection circuit design requires that the 12v lithium-ion battery protection circuit will increase the additional loss of battery energy and reduce the battery application time. This requires the lithium-ion battery protection circuit to achieve low power consumption with high accuracy. In addition to the basic functions of overcharge protection, overdischarge protection and overcurrent protection, a lithium-ion battery protection chip must also meet the following requirements: 1) Ultra-low power consumption; ultra-low protection circuit power consumption is convenient for lithium batteries Transportation and storage of finished products, and can get a longer use time. Therefore, the power consumption of the protection circuit of the lithium-ion battery needs to be as low as possible; 2) High-precision detection of the voltage; the voltage of the lithium battery is the standard for determining the battery power, and the protection circuit needs to make corresponding protection actions according to the battery power status, so it is necessary The coordination of high-precision voltage detection mechanism; 3) Reliable balance control circuit; The quality of the balance circuit determines the ultimate battery life. Generally speaking, a reliable lithium battery balance solution can increase the battery life by hundreds of times on the original basis. Lithium battery service life; what kinds of cathode materials are there for 12v lithium battery? At present, my country's 12v lithium battery cathode materials include lithium cobalt oxide, ternary materials, and lithium iron phosphate. Ternary materials combine the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganate materials, and have a price advantage, but their applications are affected by the price of cobalt. When the price of cobalt is at a high level, the price of ternary materials is higher than that of lithium cobalt oxide. Low, with strong market competitiveness; but when the price of cobalt is low, the advantage of ternary materials compared with lithium cobalt oxide is greatly reduced. At present, there is a general development trend of lithium cobalt oxide materials being replaced by ternary materials. Lithium manganate and lithium iron phosphate. The application fields of cathode materials are clearly differentiated. At present, lithium cobalt oxide is still the main force of cathode materials in the field of small lithium batteries, and is mainly used in traditional 3C fields; ternary materials and lithium manganate are mainly used in small lithium batteries, and are used in Japan and South Korea. The technology of power lithium battery is relatively mature, and it is mainly used in the fields of electric tools, electric bicycles and electric vehicles; iron phosphate 12V lithium ion battery is used in the field of power lithium battery in China, and it is the development direction of energy storage battery in the future. Base station and data center energy storage, home energy storage, wind photovoltaic energy storage and other fields. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous: What are the reasons why the lithium battery cannot be charged?