Difference between polymer battery and liquid lithium battery

2021-07-21       642  Browse times
Difference between polymer battery and liquid lithium battery
Compared with liquid lithium battery, polymer battery has different structural characteristics. First, let's take you to know what polymer battery is. I believe you will understand it. Let's take a look at the difference between polymer battery and liquid lithium battery.

What is polymer battery
Lithium polymer battery, also known as polymer lithium battery, is a battery with chemical properties. Compared with the previous batteries, it has the characteristics of high energy, miniaturization and lightweight. Lithium polymer battery has ultra-thin characteristics. It can be made into batteries with different shapes and capacities to meet the needs of some products. In theory, the minimum thickness can reach 0.5mm.

Lithium polymer battery (Li polymer, also known as polymer lithium ion battery) has many advantages such as high specific energy, miniaturization, ultra-thin, lightweight and high safety. Based on such advantages, lithium polymer batteries can be made into batteries of any shape and capacity, so as to meet the needs of various products; And it uses aluminum-plastic packaging, internal problems can be immediately shown through the outer packaging, even if there are potential safety hazards, it will not explode, but will swell. In polymer battery, electrolyte plays the dual functions of diaphragm and electrolyte: on the one hand, it separates the positive and negative electrode materials like diaphragm, so that there is no self discharge and short circuit in the battery; on the other hand, it conducts lithium ions between the positive and negative electrodes like electrolyte. Polymer electrolyte not only has good conductivity, but also has the characteristics of light weight, good elasticity and easy film formation of polymer materials. It also conforms to the development trend of light weight, safety, high efficiency and environmental protection of chemical power supply.

1. Safety factor: under extreme conditions (if charged / high temperature), there will be obvious chemical changes inside the lithium battery, causing a lot of vapor. At this time, the liquid lithium battery is wrapped by a plastic shell. When the internal gas pressure is very high, the shell will crack and explode, while the polymer lithium battery is wrapped only with aluminum film (or plastic shell), As long as the internal gas pressure is slightly higher, it will swell or crack, which is not easy to cause explosion accidents. However, it must be noted that both liquid lithium batteries and polymer lithium batteries can ignite under extreme standards.

2. Cost: except that the raw material cost of polymer lithium battery is higher than that of liquid lithium battery, this is because polymer lithium battery has strong customizability, so it will lead to great cost in the whole process of design scheme and production and manufacturing, such as various customized fixtures, tooling, test equipment, etc, The cost of initiating polymer lithium battery is higher than that of standard liquid lithium battery.

3. Energy density: the greater the energy density, the greater the kinetic energy, and the kinetic energy of the battery volume. According to the continuous improvement of negative level (anodic oxidation), diaphragm and other raw materials / thickness, the specific energy of polymer lithium battery is 600wh / L +.

4. Customizability: the polymer lithium battery is extremely easy and lightweight in product appearance design. In addition, it can be easily made into various shapes without metal protective shell.

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