Why 18650 Lithium Batteries Are Burning Or Exploding

Why 18650 Lithium Batteries Are Burning Or Exploding

1. Internal short circuit: Structural or process defects lead to the insertion of the tabs, too little excess diaphragm wrapping, burrs, and diaphragm discounts, etc. The insertion of the tabs often occurs in the structure of thick batteries and internal parallel connection, and the insulation of the tabs is not in place. Adding a protective plate to the subsequent finished product or using the process can easily lead to an acute short circuit inside the battery, resulting in burning or explosion, but now this situation is almost Less, unless external factors.

2. External short circuit: The explosion after combustion caused by the external short circuit of the lithium battery below 1AH is rare. It is usually caused by bulging or simply burning the tab. I have personally analyzed that it is caused by the external short circuit of the power battery or large-capacity mobile phone battery. combustion. This involves improper use by customers – the insulation of the tabs is not considered when installing the metal outer box, and abnormal battery smoke and combustion occur at the installation site; power batteries are also often insufficient in structural fixing measures (ill-considered), and the battery pack is used during the user’s use. Shaking will cause damage to the external insulating protective film of the battery or damage to the connecting wire skin, which will eventually lead to short-circuit burning.

3. Overcharge explosion: This is the most dangerous, and the one that enterprises are most afraid of, but it still occurs occasionally. From what I know, there are two points: a. The user does not use the matching charger as required, thereby destroying the protection circuit and the user often charges for an unlimited time, which is difficult without frying; b. 18650 lithium battery The combination is unreasonable and the protective plate fails. In this case, the explosion will be a mess. Same goes for a single battery.

4. When the 18650 lithium battery is heated, the reaction inside the battery is like a reaction chain, and each reaction promotes each other and proceeds in sequence. First, the decomposition of the SEI film releases heat and heats the battery, which promotes the reaction between the negative electrode and the solvent to release more heat, resulting in the reaction between the negative electrode and the binder and the decomposition of the solvent. Then the positive electrode begins to undergo thermal decomposition reaction, releasing a large amount of heat and gas. , and finally cause the lithium battery to burn or explode.

5. Manufacturing process. The manufacturing process of 18650 lithium battery is also an important factor affecting the safety performance of the battery, among which there are three main factors, namely positive and negative electrode capacity ratio, slurry uniformity control, and coating quality control.

6. Temperature. There are many factors that affect the safety of lithium batteries. Among them, battery materials have an important impact on the safety of lithium batteries, because battery materials are generally thermally active. When the battery temperature continues to rise, many thermal reactions will occur inside it. When the heat cannot be dissipated in time, it is easy to cause battery safety accidents, so the selection of positive and negative materials for lithium batteries has an important impact on the safety performance of the battery.

Choosing An 18650 Lithium Battery Or A Lithium Polymer Battery For Your Electric Vehicle

Choosing An 18650 Lithium Battery Or A Lithium Polymer Battery For Your Electric Vehicle

Choosing an 18650 lithium battery or a lithium polymer battery for your device is a great way to ensure long-term use. Unlike traditional batteries, however, lithium polymer batteries have different internal structures and are safer to use. A lithium-ion battery has a negative electrode and a positive electrode. Both are made of a ternary material, lithium manganese oxide or an alloy. In addition to this, both have an electrolyte. The latter is a solid or gel, which helps it resist corrosion.

A battery’s charge is like the amount of fuel it can hold. The capacity is the total amount of fuel it can carry for a given SOC. The former is the more reliable choice, because it has no ‘polymer poles’ to rupture under slight pressure. While an 18650 lithium battery can provide an average capacity of 2200mAh, a lithium polymer can deliver as much as 600Wh per liter.

Another advantage of a lithium polymer or 18650 battery is its increased capacity. While the former has more energy, a lithium-ion battery provides a higher level of safety. Depending on your application, you may need a battery with greater capacity and more power. A lithium-ion battery will last for months or even years, but a lithium-ion battery will last a lot longer than a traditional alkaline battery.

The main downside to using a lithium-ion battery is that it can only be recharged a limited number of times. This is because the cells are not rechargable and are susceptible to oxidation and electrochemical degradation. Compared to a traditional battery, the 18650 lithium polymer battery is safer and easier to replace. It also has more capacity than an 18650 battery. These batteries are commonly used in automobiles and other electronic devices.

A lithium-ion battery has two main types: primary cells and secondary cells. A primary cell has a capacity of 3600mAh, while a lithium-ion battery has a capacity of about 800mAh. While primary cells cannot be recharged after a discharge, a secondary one can. If you need more capacity, you should buy a higher-capacity model. You can also use a combination of both.

The charge and capacity of an 18650 lithium battery are important factors in your decision. The primary cell is the most common type, but you can choose between lithium polymer and 18650 batteries as long as they are compatible with each other. The latter is ideal for electric vehicles and other uses requiring high power. In contrast, a secondary cell is the only type of battery that can be charged by a computer.

A lithium-ion battery has a lower capacity and is therefore more expensive than an 18650 battery. In contrast, a lithium-polymer battery is more affordable than its lithium-ion counterpart, but it will last longer in some applications. A discharged lithium-ion battery will have a shorter lifespan. This is why a secondary battery is better for your electric vehicle. Moreover, a higher capacity means a longer range.

Both lithium polymer battery types have their advantages and disadvantages. Those who drive electric vehicles should go for the 18650 version. It has a higher capacity and is more efficient. Its drawbacks are that the batteries have low energy density and require a large number of batteries to maintain a continuous drive. A lower energy density also means that electric vehicles must run longer. The capacity of a battery is different than the charge.

The most common type of lithium polymer battery is 18650, and it is usually the smallest. The most common type of lithium-polymer battery has a higher capacity. A higher capacity can be a better option for vehicles with smaller batteries and a lower weight. A high capacity is good for cars with better performance. A smaller size can be used for smartphones and laptops. If you do not need a large capacity, then a lower voltage is better for your needs.