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At present, Jiaya has the ability to provide lithium battery system integration products for various models of electric forklifts, and its market share in the domestic high-end market is among the top in the industry.

At the beginning of its establishment, Kaiya was positioned as a technology-based enterprise that provides lithium forklift battery system integration products to electric forklift users, and a technology and quality oriented enterprise that provides lithium battery system integration product supporting services to domestic and international electric forklift manufacturers. Forklift lithium battery manufacturers will introduce to you the working principle of forklift lithium battery circuits

1. Normal state

Under normal conditions, the "CO" and "DO" pins of N1 in the circuit output high voltage, and both MOSFETs are in a conducting state. The battery can freely charge and discharge. Due to the small conducting impedance of MOSFETs, usually less than 30 milliohms, their conducting resistance has little impact on the performance of the circuit. In this state, the current consumed to protect the circuit is: μ Grade A, usually less than 7 μ A.

2. Overcharge protection

The charging method required for lithium-ion batteries is constant current/constant voltage. In the initial stage of charging, it is constant current charging. As the charging process progresses, the voltage will rise to 4.2V (some batteries require a constant voltage value of 4.1V depending on the positive electrode material), and then switch to constant voltage charging until the current decreases. During the charging process of the battery, if the charger circuit loses control, it will cause the battery voltage to exceed 4.2V and continue constant current charging. At this time, the battery voltage will continue to rise. When the battery voltage is charged to exceed 4.3V, the chemical side reactions of the battery will intensify, which can cause battery damage or safety issues.

In a battery with a protective circuit, when the control IC detects that the battery voltage reaches 4.28V (this value is determined by the control IC, and different ICs have different values), The CO pin will change from high voltage to zero voltage, causing V2 to switch from conducting to off, thereby cutting off the charging circuit and preventing the charger from charging the battery, providing overcharging protection. At this time, due to the presence of the built-in body diode VD2 of V2, the battery can discharge external loads through this diode.

There is a delay time between the detection of battery voltage exceeding 4.28V by the control IC and the issuance of the turn off V2 signal. The length of this delay time is determined by C3, usually set at around 1 second, to avoid misjudgment caused by interference.

In the above control process, it can be seen that the magnitude of its overcurrent detection value not only depends on the control value of the control IC, but also on the conduction impedance of the MOSFET. When the conduction impedance of the MOSFET is larger, the overcurrent protection value for the same control IC is smaller.

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