3.7V Li-ion Battery

This is due to the materials used in 3.7V Li-ion batteries and lightweight battery packs. Our 3.7V Li-ion batteries are typically made from LCO, NiCoMn NCM, or ternary materials due to their lightweight and high energy density. And the design of the battery pack is simple. In addition, because a single cell delivers 3.7V, their battery packs are very simple. Only a few cells are needed to achieve the required voltage, which reduces the need for complex series connections and enables lighter packages, such as flexible battery packs or 18650 cylindrical cells, reducing the overall weight of the battery.

The discharge capability of a 3.7V lithium-ion battery depends on its capacity and C-rate. The C-rate refers to the current required for the battery to release its rated capacity within a specified period. A higher C-rate indicates a faster discharge speed. 

Typically, a 3.7V lithium-ion battery has a fully charged voltage of 4.2V and a discharge cut-off voltage of around 3.0V. Discharging below 3.0V may cause irreversible damage, reducing the battery’s lifespan and compromising safety. The discharge current or power is not fixed and mainly depends on the battery’s internal chemistry. For instance, lithium cobalt oxide (LCO) typically supports up to 3C, lithium ternary (NMC)around 5–10C, and lithium iron phosphate (LFP) up to 10–25C.

This is because 3.7V lithium-ion batteries have low internal resistance and resistance besides high energy density and high discharge rate(C-rate). The low internal resistance can effectively suppress voltage fluctuation and reduce heat accumulation during the discharge process, making the operation of the equipment more stable. The mature protection circuit prevents overcharging and over-discharging, thereby avoiding safety hazards caused by abnormal voltages.

3.7V single-cell lithium-ion batteries can also be flexibly configured in series and/or parallel to meet diverse device requirements for voltage and power, making them popular in the high-power consumption market.

When using 3.7V lithium-ion batteries, incorrect charging will cause damage to the battery and bing a safety hazard. Therefore, it is important to avoid incorrect charging, such as overcharging, overheating, or using unsuitable chargers.

Overheating and overcharging will take the voltage/current to lead to decomposition of materials and release a large amount of heat due to short-circuiting of the device, explosion, fire, or other safety accidents. The rated voltage of 3.7V lithium-ion batteries will become 4.2V after a full charge; that is why if the voltage exceeds 4.2V during charging, it is considered overcharging.

This is because the voltage of a 3.7V lithium battery is close to 4.2V (the safe voltage on line) when it is fully charged, while at the end of discharge, the internal reaction efficiency of the battery decreases and the internal resistance rises, increasing the proportion of electrical energy converted to heat, which in turn produces a significant heat generation.

Even during the charging process, the chemical reaction inside the battery generates a certain amount of heat. If the surface temperature of the 3.7V li ion battery is abnormally high, it may indicate that the reaction process is overly intense, which affects the life span battery, and causes damage to the equipment it is applied to.

In addition, the structure of the battery also affects its heat dissipation performance. Most 3.7V li ion batteries are widely used in small portable devices, which are small and compact and have limited space for heat dissipation, further exacerbating the accumulation of heat.

Compared with traditional batteries, 3.7V Li-ion batteries have higher energy density and faster charge cycles, with lower self-discharge rates to maintain stable power output even when not in use for long periods of time. Compared with NiMH batteries, 3.7V Li-ion batteries have a higher voltage per cell, usually about 2.5V higher, and are lighter in weight for the same capacity, making them more efficient in many high-performance, portable applications, and helping to improve the overall operating efficiency and endurance of the machine.

3.7V lithium-ion batteries, like other lithium-ion batteries, consist primarily of an anode, a cathode, an electrolyte, and a diaphragm. The anode material is usually graphite, while the cathode is mostly made of lithium cobaltate (LCO) or lithium ternary (NMC), which support higher voltage platforms and energy densities and are widely used in portable electronic devices.

Of course, VTCBATT’s 3.7V Li-ion batteries can be customized to meet different capacity requirements, typically ranging from 1,000mAh to 10,000mAh. Higher capacity batteries generally require larger dimensions. All customized battery packs can be equipped with PCM or BMS protection circuits to ensure safety, stability, and long-term performance.