With the improvement of living standards and the popularization of intelligence, smart wearable devices have emerged as the times require. Smart wearable devices are like clothes and jewelry, which can be worn on the body continuously.
The potential applications of IoT are wide-ranging, but they also share some important characteristics. The devices used to collect data need to be small, easy to use, and almost always available.
Consumers must wear wearables continuously in order to collect the data they need, so they must be small, comfortable, and able to work continuously for long periods of time.
Wearables are not only limited in size, but since long-term wear and comfort are important, they must also be very light, so batteries must be as small as possible.
Not only that, but battery life is the number one consideration for consumers when purchasing a lithium li-ion battery convenience product, so high battery capacity is very important to product success.
Meeting these two requirements simultaneously makes the challenge for lithium ion battery wholesale even more daunting, and fortunately, many properties of lithium batteries allow them to overcome this challenge, making them ideal for wearable device applications.
First, they offer high energy density, allowing system designers to choose smaller and lighter batteries that can provide longer operating times.
Meanwhile, lithium-ion batteries typically operate at 3.7 V, compared to just 1.2 V for nickel-metal hydride or nickel-cadmium batteries. This means that lithium-ion batteries require fewer cells, which also helps enable smaller and lighter systems.
In addition, their self-discharge rates are also much lower than nickel-based batteries, around 2% per month, while NiMH and NiCd batteries are as high as 5% per day.
Not only does this reduce the number of recharges, but the battery can be used again at any time after it has been left for a long time, making the system more user-friendly.
1. Small battery, long battery life, high energy density
2. Higher operating voltage means fewer cells and smaller systems
3. Slower self-discharge: Fewer recharges, ready to use
To avoid these safety issues, Li-ion batteries require a constant current (CC), constant voltage (CV) charging process. During this process, the battery is first charged with a fixed current until the set voltage is reached.
Then, the charging circuit switches to constant voltage mode to supply the necessary current to maintain the set voltage.
For optimal charging results, careful trade-offs must be made in the selection of current and voltage levels. Charging at higher voltages can increase the capacity of lithium batteries, but too high voltages can cause the battery to be stressed or overcharged, resulting in permanent damage, damage to stability and danger.
Likewise, a higher charging current can speed up charging, but at the cost of reduced battery capacity, a 30% reduction in charging current can increase the amount of charge the battery can store by as much as 10%.
Therefore, the charging current is usually set to half the battery capacity (the maximum current the battery can last for an hour), and the voltage is set to 4.2 V per cell.
It turns out, however, that using a slightly smaller Li-ion battery charging current and voltage slows the battery's aging, allowing it to survive more charge cycles with a higher capacity.
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