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Is it better to use polymer lithium batteries for power banks or lithium batteries? Generally speaking, mobile power banks use two types of batteries: lithium batteries and lithium polymer batteries. The characteristics of lithium polymer batteries are high energy density, the ability to be ultra-thin, and their internal materials are solid or colloidal solids, which will not leak liquid in the event of battery damage. The characteristics of lithium-ion batteries are lightweight and easy to carry.

Mobile power supply, commonly known as power bank, I think everyone is familiar with it. It is estimated that the majority of value users also have at least one, some even several. At present, mobile power cells on the market are generally divided into two categories: lithium polymer batteries and lithium batteries. Lithium polymer batteries should be called lithium-ion polymer batteries in full, so lithium-ion polymer batteries are also a type of lithium-ion battery. From an internal structure perspective, the biggest difference between lithium polymer batteries and lithium-ion batteries is the electrolyte. Lithium polymer batteries use solid or gel like polymer electrolytes, while lithium-ion batteries use liquid electrolytes.

Is it better to use polymer lithium batteries for power banks or lithium batteries?

Polymer lithium batteries are better for power banks. Lithium polymer lithium batteries are upgraded and replaced products of lithium-ion batteries. Compared to the popular lithium-ion batteries, they have advantages such as large capacity, small size, and safety. But the price is also more expensive.

Compared to lithium batteries, the characteristics of lithium polymer batteries are as follows

1. Relatively, the problem of battery leakage has been improved, but it has not been completely improved.

2. Can be made into a thin battery: with a capacity of 3.6V250mAh, its thickness can be as thin as 0.5mm.

3. Batteries can be designed in various shapes. Manufacturers do not need to be limited to standard appearances and can economically make suitable sizes. Polymer batteries can increase or decrease the thickness of battery cells according to customer needs, and develop new battery cell models with low prices and short mold opening cycles

4. Can be made into a single high voltage: Liquid electrolyte batteries can only be connected in series with several batteries to obtain high voltage, while polymer batteries can be made into multi-layer combinations within a single cell to achieve high voltage due to their lack of liquid.

5. The discharge capacity is theoretically 10% higher than that of lithium-ion batteries of the same size.

6. Good safety performance. Polymer lithium batteries use aluminum-plastic soft packaging in their structure, which is different from the metal shell of liquid batteries. Once a safety hazard occurs, liquid batteries are prone to explosion, while polymer batteries only experience gas bubbles at most.

7. Ultra thin, the battery can be assembled into a credit card. Ordinary liquid lithium batteries adopt the method of customizing the shell first and then plugging positive and negative electrode materials. There is a technical bottleneck in achieving a thickness of less than 3.6mm, while polymer cells do not have this problem. The thickness can be less than 1mm, which meets the current demand for mobile phones.

8. The internal resistance of polymer lithium batteries is smaller than that of general liquid batteries. Currently, the internal resistance of domestically produced polymer batteries can even reach below 35m Ω, greatly reducing the battery's self consumption and extending the standby time of mobile phones, which can fully reach the level of international standards.

At present, most polymer lithium batteries in China are only soft pack batteries, using aluminum-plastic film as the outer shell, but the electrolyte has not changed. This type of battery can also be thinned, with better low-temperature discharge characteristics than polymer batteries, and the material energy density is basically the same as liquid lithium batteries and ordinary polymer batteries. However, due to the use of aluminum-plastic film, it is lighter than ordinary liquid lithium batteries. In terms of safety, when the liquid just boils, the aluminum-plastic film of the soft pack battery will naturally bulge or rupture, and it will not explode.

Disadvantages of polymer lithium batteries:

1. The cost of batteries is high, and it is difficult to purify the electrolyte system.

2. It is necessary to protect the circuit control. Overcharging or discharging can damage the reversibility of chemical substances inside the battery, seriously affecting its lifespan.

Disadvantages of lithium batteries

1. Lithium primary batteries have poor safety and a risk of explosion.

2. Lithium ion batteries with lithium cobalt oxide cannot discharge at high currents and have poor safety.

3. Lithium batteries need to protect the circuit to prevent overcharging and discharging of the battery.

4. High production requirements and high costs.

Compared with lithium batteries, polymer lithium batteries have better safety, operating temperature range, cycle life, and environmental performance. Therefore, lithium polymer batteries are better used in power banks.

Reminder: When charging lithium batteries, it is necessary to use a dedicated lithium charger, especially to ensure that the parameters of the battery are matched and consistent with the battery used. When using lithium batteries in combination, it is necessary to add a PCB protection board to the battery pack to avoid battery packaging, leakage, and even fire and explosion, and to extend the battery's service life as long as possible. However, if the battery cannot be charged or discharged, it will increase the number of battery cycles.

Regardless of the type of mobile power bank you purchase, it is important to choose a well-known brand of lithium battery and purchase it from a reputable store, as the larger the brand, the more counterfeit products there are.

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