12V 200Ah 26650 32700 Lithium Iron Phosphate Energy Storage Battery Pack
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species
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Lithium Iron Phosphate
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Voltage
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32700-12V |
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capacity
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200AH |
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Batteries
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IFR32700 3.2V 6Ah |
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size
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521*238*218mm |
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weight
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24KG |
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Maximum charging current
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100A |
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Maximum discharge current
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150A
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Display screen
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No |
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Communication support
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No |
Lithium-ion battery charging circuit design
According to the structural characteristics of lithium-ion batteries, the maximum charging termination voltage should be 4.2V, which cannot be overcharged, otherwise the battery will be scrapped due to too much lithium ion on the positive electrode. It has high charging and discharging requirements, and can be charged with a special constant current and constant voltage charger. Usually, after the constant current is charged to 4.2V/section, it is transferred to constant voltage charging, and the charging should be stopped when the constant voltage charging current drops to less than 100mA. Battery capacity (such as a 1350mAh battery, its charging current can be controlled between 135~2025mA). The conventional charging current can be selected at about 0.5 times the battery capacity, and the charging time is about 2~3 hours.
Due to the internal structure of the lithium-ion battery, the lithium ions cannot all move to the positive electrode during discharge, and a part of the lithium ions must be retained at the negative electrode to ensure that the lithium ions can be smoothly embedded in the channel during the next charge. Otherwise, the battery life is shortened accordingly. In order to ensure that some lithium ions remain after discharge in the graphite layer, the minimum voltage at the end of discharge must be strictly limited, that is, the lithium-ion battery cannot be over-discharged. The discharge termination voltage is usually 3.0V/cell, and the minimum voltage should not be lower than 2.5V/cell. The length of battery discharge time is related to the capacity of the battery and the size of the discharge current.
The principle of the lithium-ion battery charging circuit
Principle: Charge the battery at a constant voltage to ensure that it will not be overcharged. The input DC voltage is 3 volts higher than the voltage of the charged battery. R1, Q1, W1 and TL431 form a precision adjustable voltage regulator circuit, Q2, W2 and R2 form an adjustable constant current circuit, and Q3, R3, R4, R5 and LED are charging indication circuits. As the voltage of the charged lithium-ion battery rises, the charging current will gradually decrease, and the voltage drop on the R4 will decrease when the battery is fully charged, so that Q3 will be cut off, and the LED will be off, in order to ensure that the battery can be sufficient, please continue to charge for 12 hours after the indicator light is off. When using, please install a suitable radiator for Q2 and Q3.
Product Tags:
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12V 200Ah 26650 32700 Lithium Iron Phosphate Battery Energy Storage Battery Pack Images
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