Lithium battery pack charging method, lithium battery pack protection plate equalization charging method. When many people see the charging method, they think that charging just means plugging in the interface. As a lithium battery manufacturer, I tell you that it is not just that simple. There are many construction methods for charging lithium battery packs.

　　Lithium battery pack charging method

　　▲Charging

　　The safe working voltage range of lithium battery packs is 2.8~4.2V. Below or above this voltage range, the lithium ions in the battery become very unstable and even cause accidents. To ensure that the battery is within a safe range, a specialized charger is required. These chargers automatically adjust charging based on the current state of the battery.

　　▲Activate

　　Before the lithium battery charger starts charging, it will supply a small current to the battery, and at the same time detect changes in battery voltage, and gradually increase the current until the set value. This process can be regarded as an activation or test charge.

　　▲Constant current variable voltage charging

　　The charger charges the battery with a constant current. As the battery voltage increases, the charger also increases the charging voltage to speed up the charging.

　　▲Variable current and constant voltage charging

　　When the battery reaches the cut-off voltage of 4.2V, the battery is only charged with about 70% of the power (not full). At this time, the charger continues to charge the battery with a constant voltage and a gradually decreasing current. When the value is less than 0.1A, it still detects that the battery voltage continues to rise before stopping charging.

　　Precautions for correct charging of lithium battery pack

　　●Avoid charging at excessively high temperatures

　　If the lithium battery is used in an environment above the specified operating temperature, that is, above 35°C, the battery's power will continue to decrease, that is, the battery's power supply time will not be as long as usual. Therefore, trying to maintain a suitable operating temperature is a good way to extend the life of lithium batteries.

　　●Avoid charging at too low temperature

　　If you use a lithium battery pack in a low-temperature environment, that is, below 4°C, you will also find that the battery life is reduced. The original lithium battery of some mobile phones cannot even be charged in a low-temperature environment. But don’t worry too much. This is only a temporary situation. It is different from use in high temperature environments. Once the temperature rises and the molecules in the battery are heated, the battery will immediately return to its previous capacity.

　　●Frequently used

　　Life is movement. If you want to maximize the performance of a lithium-ion battery, you need to use it frequently to keep the electrons in the lithium battery in a flowing state. If you do not use lithium batteries frequently, please remember to complete a charging cycle for the lithium battery every month and do a power calibration, that is, deep discharge and deep charging.

　　Equalizing charging method for lithium battery pack protection board

　　Commonly used lithium battery pack balancing charging technologies include constant shunt resistance balancing charging, on-off shunt resistor balancing charging, average battery voltage balancing charging, switched capacitor balancing charging, buck converter balancing charging, inductor balancing charging, etc. When a set of lithium batteries is charged in series, each battery should be charged evenly, otherwise the performance and life of the entire set of batteries will be affected during use.

　　1. Attach a parallel balancing circuit to each single cell of the lithium battery pack to achieve a shunt function. In this mode, when a battery reaches full charge first, the balancing device prevents it from overcharging and converts the excess energy into heat to continue charging the under-charged battery. This method is simple, but it will cause energy loss and is not suitable for fast charging systems.

　　2. Before charging, discharge each cell one by one through the same load to the same level, and then perform constant current charging to ensure a more accurate equilibrium state between each cell. However, for battery packs, due to physical differences between individuals, it is difficult for each cell to achieve completely consistent ideal effects after deep discharge. Even if the same effect is achieved after discharging, new imbalances will appear during the charging process.

　　3. Timing, sequencing, and individually detecting and evenly charging the single cells in the lithium battery pack. When charging the lithium battery pack, it can be ensured that each lithium battery in the battery pack will not be overcharged or overdischarged, thus ensuring that each battery in the lithium battery pack is in normal working condition.

　　4. Using the time-sharing principle, through the control and switching of switch components, additional current flows into the battery with a relatively low voltage to achieve the purpose of balanced charging. This method is more efficient, but the control is more complicated.

　　5. Use the voltage parameters of each battery as the balancing object to restore the voltage of each battery to be consistent. During equalization charging, the capacitor is alternately connected to two adjacent batteries through a control switch, receives charge from the high-voltage battery, and then discharges to the low-voltage battery until the voltages of the two batteries become consistent. This balancing method can better solve the problem of battery pack voltage imbalance, but this method is mainly used in situations where the number of batteries is small.

　　6. The entire system is controlled by a single-chip microcomputer, and each battery has an independent set of modules. The module performs charge management on each single battery according to the set program, and automatically disconnects after charging is completed. This method is relatively simple, but it will greatly increase the cost when the number of single cells is large, and is not conducive to reducing the system volume.

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