The 18650 lithium-ion battery capacity is distributed between 1000mAh and 3000mAh. Due to the particularly hot market, the price of today's 18650 lithium-ion batteries is extremely chaotic. The capacity of the 18650 lithium-ion battery pack is of concern to many industrial users and consumers, because the larger the capacity of the 18650 lithium-ion battery, the longer the usage time and the longer the power supply can be supplied to the user.
What are the important factors that affect the capacity of 18650 lithium-ion batteries?
The battery capacity is affected by the degree of aging. We all know that when the capacity decays to a limit value, the battery is eliminated. It can be seen that there is an absolute correlation between the two. Secondly, the capacity is also affected by temperature. At low temperatures, the activity of the active material decreases, and the amount of ions that can be supplied decreases, and the capacity will inevitably decrease.
The capacity of 18650 lithium-ion batteries is an important selling point for manufacturers. In addition, the brand of 18650 lithium-ion batteries with the same capacity is also a factor that affects the price. Generally speaking, imported brands are more expensive than domestic brands of the same type. The important factor that determines the capacity of 18650 lithium-ion battery is the structure of raw materials. The price of lithium cobalt oxide, lithium manganate and ternary materials, and lithium iron phosphate will be different.
Because of the dominant use of capacity for price, the capacity of 18650 lithium-ion battery packs on the market will have a false standard. For example, the capacity of 18650 lithium-ion battery with a capacity of 2200mAh is marked as 2600mAh, which is deceiving consumers. Compliance is often caused by artificial nutrients, so users should identify qualified manufacturers.
In addition to the aging and decay of the lithium-ion battery itself, there is a more common and important factor, that is, the different self-discharge rates, resulting in an imbalance in the power of the series-connected cells, which ultimately leads to a reduction in the capacity of the lithium-ion battery. Not durable.
What are the factors that affect the price of 18650 lithium-ion batteries?
1. 18650 Li-ion battery capacity
We understand that capacity is the hotspot of lithium-ion batteries that most novice users are most concerned about. Usually, the higher the capacity, the more expensive the price. At present, the most stable battery capacity range of the entire 18650 lithium-ion battery market is roughly 2200-3000mah, and the highest capacity can actually be about 3200mah. Therefore, when you buy 18650 cylindrical lithium-ion batteries in your daily life, you must choose one that suits your power supply needs, not blindly chasing high-capacity lithium-ion batteries.
2. Lithium-ion battery internal resistance
At present, there are not many household devices for the detection of battery capacity and internal resistance, and most ordinary households do not have so much time to pay attention to the real parameters of lithium-ion batteries. However, for the purchasers engaged in the lithium battery procurement business, understanding the range of internal resistance helps to obtain the final price of lithium-ion batteries more accurately. Usually, the larger the internal resistance, the smaller the capacity is. For those application environments with high power requirements, the resistance value is relatively small, and the price is naturally relatively high. So another price factor of the battery is its resistance.
3. Battery case
I believe that most of the time, the battery case is not sensitive to most battery purchasers, but we have to say that the quality of the case directly affects the final quality stability of the battery. So whether the shell is excellent also affects its price.
4. Explosion-proof design
Since the vast majority of 18650 lithium-ion battery packs are designed with steel shells, there is obviously the possibility of accidents in this type of battery, so the explosion-proof design can effectively curb the occurrence of such accidents and even tragedies. Therefore, whether there is an explosion-proof design is another reason that affects the price of lithium-ion batteries.
5. Intelligent battery management system
We understand that most of the time, lithium-ion batteries mostly use IC circuits to control their various overcharge, overcurrent, and various protections, but with the continuous improvement of modern technology, high-quality lithium-ion batteries are fully capable of designing a set of suitable intelligent battery management system. The design of this intelligent battery management system is also another critical factor affecting the price of lithium-ion batteries.
The price of lithium-ion batteries is mainly composed of three parts: cells, protective plates, and shells. At the same time, due to the power consumption and current of the electrical appliances, the material selection of the connecting pieces between the cells will affect the cost. Different connectors may also have a greater impact on cost, and different PACK processes will also affect cost.
The above are the important factors that affect the capacity and price of the 18650 lithium-ion battery pack. The length of time the lithium-ion battery is used depends on the capacity of the lithium-ion battery. powerful.