What Is High Voltage Battery?

LiHV电池的电压

An L-i-H-V battery is a type of Lithium battery that allows for a higher than normal voltage. The “HV” stands for “high voltage” and it has a higher energy density than standard LiPo batteries. Ordinary LiPo batteries have a nominal voltage of 3.7V and a fully charged voltage of 4.2V. LiFePO4 batteries have a nominal voltage of 3.2V and a fully charged voltage of 3.65V. Compared to these, LiHV batteries have a nominal voltage of 3.8V or 3.85V and can reach 4.35V or 4.4V on a full charge.

The characteristics of LiHV battery

With the increasing demand for lithium-ion batteries with higher capacities for electrical equipment, there is a growing expectation for increased energy density of lithium-ion batteries.

While high-voltage batteries have higher energy density and higher discharge platform, the safety performance is lower than that of ordinary batteries. At present, lithium cobalt oxide has been widely studied and applied as a high-voltage anode material. The structure is non-N-A-F-E-O-2 type, which is more suitable for lithium-ion insertion and ejection. The production process is simple, and the electrochemical performance is stable.

Based on the limited space and weight of the electrical power supply, the battery energy can be increased by increasing the battery voltage. For instance, increasing the operating voltage from 4.2v to 4.35v can increase the energy density of the battery up to 16%.

就高压电池和普通电池的放电率而言，高压电池具有更高的放电率和更强的功率。因此，高压电池更适合需要高速率放电的产品和设备。

关于不同容量下的不同电压的图表

下图反映了这三个充满电的电池在4.2V，4.35V和4.4V时的容量差异。

从这三个曲线中，您可以看到LiHV电池可以释放出比普通LiPo电池更大的容量，从而为您的设备提供更长的使用寿命。

电池充电提示

值得注意的是，您需要事先知道电池的最大充电电压以防止过度充电。这是因为在过度充电期间释放的氧气和电解质可能会导致正极材料的结构发生变化，从而导致容量损失或剧烈的化学反应，从而缩短电池的寿命和降低性能。在严重的情况下，可能会发生爆炸或火灾。

市场上已经有许多配备了电池管理系统（BMS）的智能电池，可以让我们设置适当的截止电压进行充电，但是还有许多用于FPV 或 RC 车辆的电池 没有BMS，如果没有BMS，则还可以设置充电器的截止电压，以避免过度充电。