What are the measures to prevent the explosion of 4s lipo battery?

The issue of 4S lipo battery safety is intricate and multifaceted. The random internal short circuit of the 4s lipo battery, which can lead to on-site failure and thermal runaway, is an unknown risk to the battery's safety. Therefore, the primary strategy and direction of efforts to enhance the safety performance of 4s lipo batteries in the future is the discovery and application of materials with high thermal stability. Next, expert 4S lipo battery provider CNHL will walk you through a number of precautions to avoid 4S lipo battery explosions.

1. Improve the thermal stability of 4s lipo battery material

Cathode materials can increase their thermal stability by enhancing synthesis conditions, improving synthesis techniques, and creating materials with high thermal stability. They can also use composite technology, like doping technology, and surface coating technology, like coating technology.

The type of harmful electrode material, the size of the material particles, and the stability of the SEI layer that the negative electrode forms are all factors that affect the material's thermal stability. Expanding the contact area between the particles, lowering the electrode impedance, raising the electrode capacity, and reducing the likelihood of active metal lithium precipitation can all be accomplished if the particles are arranged in a specific proportion to form a negative electrode.

The quality of SEI film formation directly impacts the 4s lipo battery's safety and performance when charging and discharging. The use of spherical or fibrous carbon materials, reduction, doping, surface modification, and weak oxidation of carbon materials all contribute to improving SEI film quality.

The kind of solvent and lithium salt used affect the electrolyte's stability. Using a solvent with a broad potential stability window and a lithium salt with strong thermal stability will increase the 4s lipo battery's thermal stability. The safety of the 4s lipo battery can be improved by adding non-flammable solvents, high boiling and flash points, and high boiling points to the electrolyte.

The thermal stability of 4s lipo batteries is also influenced by the kind and amount of conductive agent and binder used. At high temperatures, the reaction between the binder and lithium produces a lot of heat. Binders' calorific values vary, and PVDF's is nearly nil. The thermal stability of 4s lipo batteries can be increased by substituting a fluorine-free binder for PVDF, which contains fluorine twice.

2. Improve 4s lipo battery overcharge protection capability

A safety valve is installed on a single 4s lipo battery to provide a higher level of overcharge protection, or a dedicated charging circuit is typically used to regulate the charging and discharging process of the 4s lipo battery. Secondly, a favourable temperature can also be used to prevent overcharging. Coefficient resistors (PTCs) work by increasing the internal resistance of the 4S lipo battery when it overcharges, which limits the overcharge current. In cases when the 4S lipo battery is atypical, a specific diaphragm may also be utilized. The diaphragm's pores constrict and block when its temperature rises too high, preventing migration and the 4s lipo battery from overcharging.

3. Prevent short circuit of 4s lipo battery

The diaphragm has a homogeneous distribution and porosity of roughly 40%. The 4s lipo battery's safety can be increased by the diaphragm's 10 nm pore size, which stops tiny particles of the positive and negative electrodes from moving;

The contact between the positive and negative electrodes directly affects the separator's insulation voltage. The material, structure, and assembly circumstances of the 4S lipo battery all affect the separator's insulation voltage.

Thermal runaway of 4s lipo batteries can be avoided by using composite separators (PP/PE/PP) with a significant differential between the melting and thermal closure temperatures.

A ceramic layer is applied to the separator's surface to increase its resilience to temperature changes. The 4s lipo battery can be kept safe by preventing contact between the positive and negative electrodes, maintaining the diaphragm's shape and mechanical strength, and using low melting point PE (125°C) to shut the pores at lower temperatures (155°C).

It is commonly known that the metal lithium negative electrode is swapped out for a graphite negative electrode. This way, during the charging and discharging process, the lithium that is deposited and dissolved on the negative electrode's surface is intercalated and extracted into the carbon particles, preventing the formation of lithium dendrites.

However, this does not imply that the 4S lipo battery's safety issue has been resolved. If the 4S lipo battery's positive electrode capacity is excessively high during the charging process, metal lithium will be deposited on the negative electrode's surface, causing excessive negative electrode capacity and a significant reduction in battery capacity.

The coating's thickness and homogeneity also influence the active material's intercalation and deintercalation. For instance, metal lithium may be locally deposited on the negative electrode surface due to its thick and uneven surface density, which causes polarization sizes to vary throughout the charging process.

Furthermore, the 4s lipo battery may short circuit due to inappropriate usage conditions. A short circuit results from the deposition of metal lithium on the electrode surface when the deposition rate is higher than the insertion rate at low temperatures. Therefore, the key to preventing the production of lithium dendrites is to improve coating uniformity and manage the ratio of positive and harmful materials.

Furthermore, the 4S lipo battery may have internal short circuits due to the binder crystallization and the development of copper dendrites. Coating, baking, and heating eliminate all of the solvents in the slurry during the coating process. The active material will peel off, and the interior of the 4S lipo battery will short-circuit if the binder crystallizes due to an excessively high heating temperature.

The copper foil, which serves as the negative electrode current collector, will start to disintegrate and precipitate on the positive electrode when the 4s lipo battery is over-discharged to a 1-2V—Lipo battery internal short circuit.

The producers of CNHL lithium 4s lipo batteries have provided you with all of the content mentioned above today. In order for you to utilize a 4S lipo battery securely, I hope the information above has improved your understanding of the precautions to take in case it explodes.