Author ：Iflowpower – Portable Power Station Supplier
The lithium-ion battery blasting originally lacks the negative electrode capacity of the positive electrode to lack the negative electrode portion capacity of the positive electrode portion, or when the substrate is not capacity, the part or all of the lithium that occurred during charging is unable to pierce the inter-negative structure of the negative electrode graphite. At the outer surface of the negative electrode constitutes a protruding delegated crystal, and when the next charge is charged, the protrusions are more simple to form a precipitation of lithium. After dozens to hundreds of cycles, the dendrites will grow up, and finally pierced Paper, short-circuited inside.
The battery is dramatically discharged, and there are many heat, burning, and constitute a larger short-circuit phenomenon. High temperature will cause the electrolytic solution to combustion, negatively carbon and isolation paper, constitute an internal pressure, and the outer casing of the battery cannot be When this pressure is accepted, the battery will blast. The moisture content is over high moisture and the electrolyte in the electrolyte, producing gas, charging, and can and the generated lithium reaction, resulting in lithium oxide, so that the capacity of the battery is lost, and the battery is overchaled and generated.
, The moisture analysis voltage is low, and it is simple to analyze the generated gas when charging. When this series of generated gases increase the internal pressure of the battery, the battery core will blast when the outer casing of the battery cannot be accepted. Internal short circuit, because there is a short-circuit phenomenon internally, the electrical cell is discharged, and a lot of heat, burning is broken, which constitutes a larger short-circuit phenomenon, so that the electrical core will occur, the electrolyte is analyzed into a gas, constitutes internal pressure Big, when the neck of the battery is unable to accept this pressure, the battery will blast.
When the upper glue laser weld, the heat is conducted on the census ear, so that the positive ends are high, if the upper tape does not leave the positive ear and separation, the hot positive ears will cause the separation paper to burn or shorten, constitute interior Short circuit, and constitute blasting. High temperature rubber paper encloses the negative ear client when the negative ear is welded to the negative ear, if the high-temperature film is not posted, the heat on the negative ear will be broken, constitute internal short circuits, constitutes blasting. The bottom gel is not thoroughly enclosed when the bottom customer is soldered at the bottom of the aluminum nickel composite belt, and there will be a lot of heat at the bottom shell, the bottom of the pole, and if the high temperature rubber paper is not completely packaged, will burn bad , Constitute internal short circuits, constitute blasting.
When the charge is overcharged, the lithium excessive release of the positive electrode will change the structure of the positive electrode, and the excessive lithium is too much simple to pierce into the negative pole, and the lithium is simply constituted by the lithium electrode, and when the voltage arrives at 4.5V At the time, the electrolyte will analyze a lot of gas production. All of the above may constitute blasting.
External short-circuit external short circuit may be composed of improper operation, or misuse, because the external short circuit, the battery discharge current is large, the heat of the battery can cause the electrical cell to shorten the isolation or thoroughly bad, constitute internal short circuits, Happen. Maintenance measures: After the lithium-ion battery cell is filled, after the voltage is above 4.2V, a coupling will occur.
The overcharge pressure is high, and the danger is also higher. After the lithium battery voltage is higher than 4.2V, the remaining number of lithium atoms in the positive electrode data is less than half, and the storage can often be collapsed, so that the battery capacity has a permanent decline.
If it continues to charge, because the storage of the negative electrode is now filled with lithium atoms, the subsequent lithium metal will be stacked in the external table of negative electrode data. These lithium atoms will have a dendritic crystallization from the direction of the negative electrode to the lithium ion. These lithium metal crystals will pass through the paper, make the positive and negative short circuit.
Sometimes the battery will blast before the short circuit, because the information such as the overcharge process, the electrolyte, etc., so that the battery housing or pressure valve is fractured, allowing oxygen into the lithium atomic response of the oxygen in the negative electrode. In turn blasts.
Thus, when the lithium ion battery is charged, it must be set to set the voltage upper limit to simultaneously take into account the life, capacity, and safety of the battery. The most desirable charging voltage limit is 4.2V.
There must be a voltage limit when the lithium battery is discharged. When the battery voltage is less than 2.4V, some of the information will be destroyed.
Also because the battery will discharge it, the lowering the long-term voltage will be lower, and thus, it is best not to put it until 2.4V when discharged. The lithium ion battery is discharged from 3.
0V to 2.4V, and the released energy only accounts for about 3% of the battery capacity. Therefore, 3.
0V is an ideal discharge cutoff voltage. At the time of charge and discharge, in addition to the voltage limit, the limit of current is also necessary. When the current is too large, the lithium ion is not asked to enter the storage.
After these lithium ions have been electronically, lithium atomic crystals in the data appearance, which constitutes a risk of excessive charge. If the battery housing is broken, it will blast. Thus, maintenance of lithium-ion batteries, at least include: the upper limit of the charging voltage, the lower discharge voltage limit, and the upper limit of current.
In the general lithium-ion battery pack, in addition to the lithium ion battery core, there will be a maintenance board. This maintenance board is the first to supply these three maintenance. However, these three maintenance of the maintenance board is obviously not possible, and the global lithium-ion battery blasting event is still frequent.
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