Specific remembering the cause of lithium ion battery explosion

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The lithium ion battery principle The lithium ion battery is important from the positive electrode, the negative electrode, the diaphragm, and the electrolyte. The positive and negative electrode layer is tightly rolled together, and the layer is separated from the layer, and the positive and negative is immersed in the electrolyte . Cylindrical batteries and square batteries have been used as a lithium ion battery structure battery, which is composed of two different lithium-insert compounds, is positive and negative .

The node material is important for transition metal oxides, metal oxides, metal sulfides, and the like. Commercial Positive electrode materials commonly used in lithium-ion batteries are the most widely used anode materials for transition metal oxides important inorganic non-metallic materials, metal-non-metallic composites, metal oxides, and the like. Lithium iron phosphate is coated The electrode electrode material is formed on the conductive material determines the voltage and capacity electrolyte of the battery as an important part of the lithium ion battery, and plays an important use of current transmission during battery charge and discharge.

In order to prevent the positive and negative electrode material immersed in the electrolyte due to each other, the positive and negative electrolytic diaphragm is separated. The lithium ion secondary battery is actually a battery that is poor in a lithium ion concentration . charging The LI is taken from the positive electrode, and the negative electrode is embedded into the negative electrode, the positive electrode is in a lithium state, the compensation charge of the electrons is supplied by the external circuit to ensure the balance of charge.

The discharge is related to the discharge, and Li is removed from the negative electrode and is embedded into the cathode material by the electrolyte. Under normal charging and discharging conditions, lithium ions are embedded and removed between layered carbon materials and layered structures, which typically only causes changes in the spacing of the material layer without damaging their crystal structure. During the charge and discharge process, the chemical structure of the negative electrode material is basically unchanged.

The ion reaction equation is increasingly impossible to add security measures inside the battery, as it is now pursuing higher capacity to increase battery life. From 1991, the lithium-ion battery is commercialized to now, the power capacity of lithium-ion batteries has added four or five times lithium-ion battery explosion mechanism. So we understand how it works, so we can understand what is caused by lithium ions.

Battery explosion . Charge and discharge of lithium branch crystal growth battery is the return transfer of lithium ions. During charging, lithium ions are reduced to metal lithium embedded in the negative electrode.

In general, lithium can be embedded in the interlayer structure, which may grown in the surface of the electrode due to the uncertainty of growth, and the growth layer has the same stabbed structure as the branch, which can damage the diaphragm of the battery, resulting in short circuit inside the battery. And battery explosion. If there is a defect in the battery, the metal particles connect the positive negative electrode through the insulating layer of the battery, change the direction of the current, causing the internal material to degrade, enabling the chemical reaction, release more heat, ignit the battery package battery Charging our current battery has a protection system that feeds back battery voltage to prevent overcharge, which may cause overcharge, battery protection system or battery charger damage When charging occurs, the lithium ions left in the cathode material Continue to be removed and embedded in the negative electrode material.

If the maximum lithium embedded in the carbon negative electrode, excess lithium will deposit on the negative electrode material in the form of lithium metal, greatly reduced the stability performance of the battery. Even the explosion is related to the lithium-ion battery, not only is the battery capacity is an improvement, but the safety performance can not be ignored. Now some battery manufacturers have a high security standard, even to detect batteries.

We understand that when the nail penetrates the battery, it will connect directly to the positive negative, which will cause internal short circuits. The gel electrolyte and polymer electrolyte are also in further exploration, especially the development of the polymer electrolyte, there is no liquid organic electrolyte volatilization in the battery, which greatly improves the safety of the battery.

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