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Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
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release time:2024-03-05 Hits: Popular:AG11 battery
The use of lithium-ion technology to implement a battery charger is provided to you by electronic enthusiasts. In this article, we will give an example of how to use lithium-ion technology to implement a battery charger. Lithium-ion battery chargers usually use a constant current (CC) - constant voltage (CV) charging curve. The charging process will go through several different stages to ensure that the battery capacity is full
In this article, we will provide an example of how to implement a battery charger using lithium-ion technology. Lithium-ion battery chargers usually use a constant current (CC) constant voltage (CV) charging curve. The charging process goes through several different stages, ensuring the battery is fully charged while complying with specific safety rules. The CC-CV curve includes the following stages:
1.Precharge
2.Activate
3.Constant current
4.Constant voltage
Charging begins with a pre-charge phase to check whether the battery is in good condition. In this stage, a small amount of current of 5% to 15% of the battery capacity is usually provided to the battery. If the battery voltage rises above 2.8V, the battery is considered to be in good condition and can enter the activation stage. During this phase, the same current is supplied to the battery, but for a longer period of time. When the battery voltage rises above 3V, fast charging is started and a constant current equal to or lower than the battery capacity is provided. The constant current phase ends when the battery voltage rises to the full charge voltage (4.2V) or when a timeout occurs (whichever occurs first). When the battery voltage reaches the full charging voltage, charging enters the constant voltage stage and the battery voltage remains constant. To do this, the charging current must decrease over time. The charging process at this stage takes the longest time compared to other charging stages. During this process, when the charging current drops below the "end current" limit, usually 2% of the battery capacity, the battery is fully charged and the charging process ends. Please note that each stage of the charging process has a time limit, which is an important safety feature.
In order to implement this charging profile, the battery voltage and charging current must be known at all times. Also, check the temperature of the battery. Because batteries tend to get hot when charging. If the temperature exceeds the specified limit of the battery, it may cause damage to the battery.
In terms of battery charger implementation, users have two options. One is to use a specialized battery charger IC, and the other is to use a more general microcontroller. The first solution solves the problem quickly, but has limited configurability and user interface options (LED indicators). The second option uses a microcontroller, which takes slightly longer to design, but provides configurability options and can integrate other functions, such as battery state of charge (SOC) calculation and communication interface to the host in the system. The device sends information, etc. In addition, the microcontroller cannot provide the power circuitry necessary for the charger, and an external BJT or MOSFET is required. However, the cost of these power components is much lower than that of microcontrollers or specialized charger ICs.
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