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Which of the two wheeled batteries is safer
Two wheeled battery manufacturers tell you that with the enrichment of electric vehicle products, various types of batteries have appeared in the market, such as lead-acid batteries, lithium batteries, graphene batteries, etc. At present, the mainstream batteries on the market are mainly It is lead-acid battery and lithium battery. The lithium battery is divided into lithium iron phosphate, ternary lithium and so on. These batteries are necessary "good partners" for battery cars. What are the differences between them? Which is more secure?
A lead-acid battery is a battery whose electrodes are mainly made of lead and its oxides, and the electrolyte is a sulfuric acid solution. The manufacturer of the two wheeled battery tells you that in the discharge state of the lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the charged state, the main component of the positive and negative electrodes is lead sulfate. The sulfate ions and hydrogen ions present in the electrolyte move to the positive and negative electrodes of the battery respectively under the action of the electric field, forming a current inside the battery, the entire circuit is formed, and the battery continues to discharge outward.
Lithium-ion batteries usually use carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. There is a layer of separator in the middle of the battery to avoid short circuit between the positive and negative electrodes. Two wheeled battery manufacturers tell you that during the charging and discharging process, lithium ions travel back and forth between the positive and negative electrodes. During charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte. When discharging, lithium ions are precipitated from the carbon in the lamellar structure. , and recombine with the positive compound. During the intercalation and deintercalation of ions, along with the intercalation and deintercalation of equivalent electrons, a current is generated.
The so-called lithium iron phosphate battery is a lithium ion battery that only uses lithium iron phosphate as the positive electrode material. This type of battery is characterized by no precious metal elements.
The ternary lithium battery refers to a lithium battery that uses nickel cobalt lithium manganate as the positive electrode material and graphite as the negative electrode material.
The thermal stability of lithium iron phosphate is currently the best in automotive lithium batteries. The thermal stability of lithium iron phosphate cathode material itself is much better than that of ternary lithium. It has extremely high stability within 500 degrees Celsius, and thermal runaway occurs when it exceeds 800 degrees Celsius. In addition, even if thermal runaway occurs, iron phosphate The heat release of lithium batteries is also very slow, and when decomposed, it will not release oxygen, but only emit smoke, reducing the risk of fire.
Two wheeled battery manufacturers tell you that, in contrast, ternary lithium batteries have poor thermal stability and begin to dissolve at around 300 degrees Celsius. In the event of spontaneous combustion of electric vehicles, ternary lithium battery models indeed occupy a larger proportion . Therefore, the ternary lithium battery has very high requirements on the battery management system, and needs an anti-over-temperature protection device and a battery management system to protect the safety of the battery.
The lead-acid battery is more dangerous. When the lead-acid battery is overcharged, it will also produce flammable hydrogen and oxygen. Hydrogen is easy to explode in case of fire. Charging in a closed environment is also very dangerous. Two wheeled battery manufacturers tell you that although the application scope and technology of lead-acid batteries are more extensive and mature than lithium battery packs. However, the lead-acid battery itself is much less safe than the lithium battery pack in the process of material composition and use.
Two wheeled battery manufacturers tell you that lithium iron phosphate is relatively safe under high temperature conditions.