CR2477 battery

CR2477 battery protection circuit design requirements and function analysis

CR2477 battery applications are very common, in digital products, power tools, electric bicycles, electric vehicles, power supplies and energy storage and other fields. The design of lithium battery protection circuit is very important. We require that the CR2477 battery power protection chip should be able to achieve the following basic functions: overcharge protection, over-discharge protection, over-current protection and short-circuit protection. Improve the service life of lithium batteries and ensure the safe use of batteries. What is a CR2477 battery? CR2477 battery is made of 3 or 4 lithium batteries connected in series. The combined battery pack, the battery capacity is determined according to the capacity of a single battery cell, or the capacity of the batteries connected in parallel, is a new type of safe and environmentally friendly battery. CR2477 battery parameter combination: ICR18500-3S2P Nominal voltage: 11.1V Discharge voltage: 11.1V-12.6V Conventional discharge current: 0-2A Large capacity is 3-4A Nominal capacity: in MahA units, there are multiple sizes Standard continuous discharge current: 0.2C Maximum continuous discharge current: 1C Working temperature: Charging: 0~45℃ Discharge: -20~60℃ CR2477 battery protection circuit design requirements Due to the high energy density of 12v lithium batteries, in the overcharge state, the battery temperature rises and the energy will be excessive, so the electrolyte decomposes and produces gas, which easily causes the internal pressure to rise and cause the risk of spontaneous combustion or rupture; on the contrary, in the over-discharge state, the electrolyte decomposes, causing the battery characteristics and durability to deteriorate, reducing the number of recharges and shortening the battery life. Therefore, the protection of 12v lithium batteries is very important. In CR2477 battery applications, there must be a battery protection chip to prevent overcharging, over-discharging and overcurrent of the battery. The CR2477 battery protection circuit will increase the extra loss of battery energy and reduce the application time of the battery. This requires the lithium battery protection circuit to achieve low power consumption with high precision. In addition to being able to complete basic functions such as overcharge protection, over-discharge protection and overcurrent protection, a lithium battery protection chip must also meet the following requirements: (1) Ultra-low power consumption. When the lithium battery protection circuit is working, the power consumed by the lithium battery protection circuit is the loss of the battery. Therefore, we must minimize the power consumption of the lithium battery protection circuit. (2) High-precision voltage detection. In order for the lithium battery protection circuit to respond correctly to different working conditions of the battery, the protection circuit must be able to accurately detect voltage parameters such as overcharge protection voltage and over-discharge protection voltage. (3) Correct operation under a large voltage range. Since the power supply voltage of the lithium battery protection circuit is the battery voltage, and the battery voltage can fluctuate within a large range, the lithium battery protection circuit is required to work correctly within this voltage range. The CR2477 battery protection circuit needs to have the following functions: (1) If the charging voltage exceeds the maximum value allowed by the battery, it can provide a battery discharge circuit. (2) If the discharge voltage is lower than the minimum value allowed by the battery, it can provide a battery charging circuit. Then the connection between the battery and the external circuit is cut off, and (3) If the charge and discharge current of the CR2477 battery is greater than the limit value, the connection between the battery and the external circuit is cut off. (4) When the CR2477 battery returns to normal state, the protection circuit should be able to correspondingly release the protection state so that the battery can continue to work normally. What are the main positive electrode materials of 12v lithium batteries? At present, the positive electrode materials of 12v lithium batteries in my country mainly include lithium cobalt oxide, ternary materials. Lithium manganese oxide and lithium iron phosphate. The application fields of positive electrode materials are obviously differentiated. At present, lithium cobalt oxide is still the main positive electrode material in the field of small lithium batteries, mainly used in traditional 3C fields, etc.; ternary materials and lithium manganese oxide are mainly used in small lithium batteries. In Japan and South Korea, their technology as power batteries is relatively mature, mainly used in power tools, electric bicycles and electric vehicles. The 12V lithium iron phosphate battery is used in the field of power batteries in China, and it is the direction of future development of energy storage batteries. It is mainly used in base station and data center energy storage, household energy storage, wind and solar energy storage and other fields. Ternary materials combine the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganese oxide, and have price advantages, but their application is affected by the price of cobalt. When the price of cobalt is high, the price of ternary materials is lower than that of lithium cobalt oxide, and they have strong market competitiveness; but when the price of cobalt is low, the advantages of ternary materials over lithium cobalt oxide are greatly reduced. At present, there is a general trend of lithium cobalt oxide materials being replaced by ternary materials. The above are the design requirements and functions of CR2477 battery protection circuits, CR2477 battery protection boards, 16-string lithium iron phosphate battery protection boards, 18650 battery protection boards, and circuit board manufacturers will give priority to the working principle of lithium battery protection boards when designing double-sided circuit boards. The circuits and parameters of lithium battery protection boards vary depending on the IC used, voltage, etc.

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