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The difference between lithium-ion battery pack and polymer lithium-ion battery:

The concept of lithium ion battery includes lithium ion battery and lithium polymer battery. If we compare the difference between lithium polymer battery and lithium ion battery pack in a broad and narrow sense, the only one is the relationship between concept and generic concept. Lithium polymer battery is contained in lithium ion battery. Lithium-ion battery pack generally refers to aluminum shell battery. The electrolyte is liquid and the outer packaging material is aluminum shell. Lithium polymer batteries refer to all solid state or gel type lithium ion batteries. Generally, aluminum-plastic composite film is used as packaging material.

① Raw materials

Polymer lithium-ion battery refers to the use of polymer materials in at least one of the three major components of positive electrode, negative electrode or electrolyte. High molecular weight means high molecular weight, and its corresponding concept is small molecule, which has high strength, high toughness and high elasticity. At present, the polymer materials developed for polymer batteries are mainly used for cathode and electrolyte.

② Shaping difference

The polymer lithium ion battery can be thinned, arbitrarily shaped and arbitrarily shaped, because its electrolyte can be solid or colloidal rather than liquid; The lithium-ion battery pack uses electrolyte, and a solid shell should be used as the secondary packaging to contain the electrolyte. Therefore, this also adds some weight to the lithium-ion battery.

③ Security

Most of the current polymers are soft-packed lithium-ion batteries, which use aluminum-plastic film as the shell. When organic electrolyte is used inside, even if the liquid is very hot, it will not explode, because aluminum-plastic film polymer batteries are solid or colloidal, without liquid leakage, but naturally broken.

Which is better, lithium-ion battery pack or polymer lithium-ion battery?

Lithium polymer battery is a new type of battery with many distinct advantages, such as high energy density, miniaturization, ultra-thin, lightweight, high safety and low cost. In terms of shape, lithium polymer battery has ultra-thin characteristics, and can be made into any shape and capacity battery according to the requirements of various products. The minimum thickness that this kind of battery can reach is 0.5mm.

In polymer lithium-ion batteries, the electrolyte plays the dual functions of the diaphragm and the electrolyte: on the one hand, it is the same as the diaphragm to separate the positive and negative electrode materials, so that there is no self-discharge and short circuit in the battery; on the other hand, it is the same as the electrolyte to conduct lithium ions between the positive and negative electrodes. Polymer electrolyte not only has good conductivity, but also has the characteristics of light weight, good elasticity, easy film forming and other characteristics of polymer materials. It also conforms to the development trend of light weight, safety, high efficiency and environmental protection of chemical power supply

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