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16 Jan 2025
Nlelsen
In the choice of mobile power, lithium battery and polymer battery have their own advantages, which often makes consumers feel entangled. Today, we will analyze these two batteries from several key aspects.
· Polymer battery uses solid or colloidal polymer electrolyte. The characteristics of this electrolyte make it extremely difficult to leak. You can imagine that in some extreme high temperature environments, the electrolyte in ordinary lithium batteries may seep out, which is like a hidden "small bomb" that may cause danger at any time. Polymer batteries are relatively much safer.
· Its shell is made of aluminum-plastic soft packaging. This packaging form shows better safety in special circumstances. For example, when overcharging or short circuit occurs, the polymer battery will only swell up at most, like a blown-up balloon. As for liquid lithium batteries, since most of them have a sealed metal shell, once the internal pressure is too high, it is like a tightly sealed container that cannot withstand the pressure, and it is very likely to explode, which is an extremely dangerous situation.
· Of course, we cannot underestimate the safety of lithium batteries. After a long period of development, lithium batteries have a relatively mature set of safety assurance technologies. Under normal conditions of use and in accordance with relevant safety regulations, lithium batteries can also ensure safety. However, we still need to pay attention to some special circumstances. For example, the common lithium battery type 18650 uses a sealed steel or aluminum shell. If there is a short circuit or overcharging, it is easy to cause an explosion hazard due to a sharp increase in internal pressure.
· First, in terms of capacity density, polymer batteries have obvious advantages. Compared with steel-shell batteries of the same size, its capacity can be 10-15% higher; compared with aluminum-shell batteries, it can also be 5-10% higher. This means that in a mobile power bank of the same size, if a polymer battery is used, it can provide more power for the device. For example, for digital devices such as mobile phones or tablets that we use daily, when using a mobile power bank equipped with a polymer battery, the battery life of the device will be significantly extended.
· The internal resistance of polymer batteries is also relatively small. Now the internal resistance of some domestic polymer batteries can even be controlled below 35mΩ. This small internal resistance value has a big effect. It can greatly reduce the power consumption of the battery itself, so that the device can be in standby mode for a longer period of time.
· Another interesting feature is that its shape can be changed according to demand. This is a great advantage for the shell design of mobile power. Designers can create mobile power of various unique shapes according to the overall style and functional requirements of the product, and at the same time, they can make more full use of space and achieve a larger battery capacity.
· Lithium-ion batteries, which we often call liquid lithium batteries, are excellent in energy density. At the same weight, it can store more electrical energy. This is a very critical point for mobile power, which pursues small size, light weight and sufficient power.
· From the perspective of production scale, lithium batteries have mature large-scale production technology. This makes its cost relatively low and its price in the market is also more affordable. This advantage makes lithium batteries occupy a large share in some cost-sensitive application scenarios, such as some large-scale energy storage devices, which prefer to use lithium batteries.
· Polymer batteries have a relatively complex production process and relatively high costs for some raw materials, which leads to a relatively high overall production cost. This cost difference is also directly reflected in the market price. We usually find that mobile power supplies equipped with polymer batteries are more expensive than those using lithium batteries.
· As mentioned earlier, the large-scale production of lithium batteries enables it to reduce unit costs. This cost advantage makes it more popular in some mid- and low-end mobile power products. For those consumers who are more sensitive to price, lithium battery mobile power supplies are a more cost-effective choice.
· Because polymer batteries are both thin and light and can be customized according to needs, they have a good application in some products that have extremely high requirements for portability and appearance design. For example, those mobile phones or tablets that pursue the ultimate thin and light style, if their mobile power supplies use polymer batteries, they can better match the small and light device itself. Moreover, the unique shape of the mobile power supply can also form a harmonious whole with these devices in appearance.
· Lithium batteries perform better in scenarios that require large capacity and strict cost control. For example, some high-power mobile power supplies that provide power support for outdoor equipment, or large-scale application scenarios such as industrial energy storage, lithium batteries have become the first choice due to their high cost performance and stable performance.
In general, if you pursue higher safety, want a lighter and more portable mobile power supply, and have unique requirements for appearance design, then polymer batteries will be a better choice; but if you pay more attention to cost performance and can accept relatively traditional battery technology under normal use, lithium batteries are definitely a good choice.