Will polymer lithium ion batteries explod?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Depending on the electrolyte material used in lithium ion batteries, lithium ion batteries are divided into liquid lithium ion batteries (LiquifiedLithium-Ionbattery, referred to as LiB) and polymer lithium ion batteries (PLBATTERY, PLB) or plastic lithium-ion battery (PlasticLithium) , Referred to as PLB). The positive and negative electrode materials used in polymer lithium ion batteries are the same, and the positive electrode materials are divided into lithium cobalt organte, lithium manganate, tri-material and lithium iron phosphate material, and negative extreme graphite, battery work principle is also basically Consistent. Their main difference is that the electrolyte is different, and the liquid lithium ion battery uses a liquid electrolyte, and the polymer lithium ion battery is replaced by a solid polymer electrolyte.

The polymer can be "dry state" or "colloid" Most of the current polymer gel electrolyte. Then, the polymer lithium-ion battery really exploded? The polymer lithium ion battery is widely used in a mobile appliance such as laptop, smartphone due to its small size and light weight. In the case of the modern smart product carry, the security is especially important, especially more than half of the mobile phone, more than half of the above, or even more.

Then really relieve the safety of the polymer lithium ion battery? Will it explode? The polymer lithium-ion battery really exploded? 1. Polymer lithium battery uses colloidal electrolyte, different from Liquid states of lithium ion batteries. Electrolyte, colloidal electrolyte does not boil, nor does it produce a lot of gas, thereby eliminating the possibility of violent explosion.

2. Lithium batteries generally configure protective boards, explosion-proof, providing safeguards. However, in many cases, the role is limited.

3. Polymer lithium battery uses aluminum-plastic soft packaging, different from metal shells of liquid electrical cells, once security hazards, maximum drum. 4.

PVDF as a skeleton material of a polymer lithium ion battery, excellent performance. Polymer lithium ion battery precautions short circuit: generally internal short circuit, external short circuit, etc. Generally occurring during charging, there is no short circuit between battery polar plates.

Although most of the lithium-ion batteries now have short-circuit protection circuits, as well as explosion-proof lines, but in many cases, this protection circuit does not necessarily work in various cases, the explosion-proof line can play a limited role. Overcharged: Polymer lithium ion battery, if the charging voltage is too high, the time is too long, the internal temperature is continuously warmed, the internal pressure of the battery is increased, and the pressure reaches a certain degree, causing expansion, rupture. And overcharge will cause the reversibility of the internal chemicals of the battery to seriously affect the life of the battery.

The chemical properties of lithium are very lively, it is easy to combust, when the battery is charged and discharged, the internal temperature of the battery is continuously warmed, and the gas generated during the activation process is expanded. The battery is increased, and the pressure reaches a certain degree, which will rupture. , Causing leakage, fire, or even explosion.

And polymer lithium ion batteries will only expand. Damage: the battery is crushed, the battery is punctured. Since the polymer lithium-ion battery belongs to colloidal electrolyte, it is difficult to achieve the extent to which the explosion is.

Environment: Avoid using high temperatures, low temperature environments. High temperature exceeding 60 ¡ã C will cause irreversible damage to the inside of the battery, resulting in a battery scrap. Excessive temperature reduces the performance of the polymer lithium ion battery, causing the battery capacity to not be able to use.

Summary: The polymer lithium-ion battery can be seen from the above conditions, which is still good, or not, the polymer lithium battery will not explode, but the chance of the explosion of the polymer lithium battery is very low relative to the liquid battery, otherwise Will not be asked in mobile electronic devices. Advantages of Polymer Lithium Battery 1. High operating voltage of the monomer battery.

The operating voltage of the monomer battery is above 3.6V to 3.8V, which is much higher than the 1.

2V voltage of nickel-hydrogen and nickel-cadmium batteries. 2. Large capacity density, its capacity density is 1.

5 to 2.5 times the nickel-hydrogen battery or nickel-cadmium battery, or higher. 3.

Small self-discharge, the capacity loss is small after a long time 4. The long cycle life can reach more than 500 times 5. No memory effect, do not have to take the remaining electricity before charging, easy to use.

6. Good safety, polymer lithium battery in structure, aluminum-plastic soft packaging, different metal casings of the liquid electrical cell, once the safety hazard occurs, the liquid battery is easily exploded, while the polymer battery is only a drum. 7.

Ultra-thin, battery can be assembled into the credit card 8. Weight light: battery with polymer electrolyte does not need metal shells as protective outer packaging, polymer battery weight compared with equal capacity specific steel shell lithium electrostatic 40%, more aluminum shell The battery is light 20% 9. The capacity is large: the polymer battery is more than 10 to 15% higher than the equivalent size specification, and the aluminum shell battery is 5 ~ 10% 10.

The internal resistance is small: the internal resistance of the polymer battery is more Generally, the liquid electrical cell is 11. discharge characteristics preferred battery use colloidal electrolyte, compared to liquid electrolyte, colloidal electrolyte has a smooth discharge characteristics and higher discharge platform. 12.

The protection plate design is simple due to the use of polymeric materials, the cell does not get fire, does not explode, the battery cell itself has sufficient safety, so the protective line design of the polymer battery can consider omitting the PTC and fuses, thereby saving battery costs. Polymer lithium battery disadvantages 1. High battery cost, electrolyte system purification difficult.

2. Require protection line control, overcharge, or overlapping the reversibility of the internal chemicals of the battery, which seriously affects the life of the battery.

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