Why is the over-discharge protection of lithium battery protection boards so low as 2.5V in most cas

Introduction Why is the over-discharge protection of lithium battery protection boards so low as 2.5V in most cases? Hello my friend! I'm in the design field, I can tell you that! The voltage of the protection board is determined by the chip

Why is the over-discharge protection of lithium battery protection boards so low as 2.5V in most cas

Hello, my friend!

I'm a designer, I can tell you that!

The voltage of the protection board is determined by the chip!

Generally, there are 2.4V, 2.5V, 2.7V and 3V It must be said that they are all reasonable! It just depends on your battery!

However, I generally like to use 3V!

How do lithium batteries handle overdischarging or overcharging?

Pacific Automotive Network Overcharging and overdischarging will damage lithium iron phosphate batteries. Overcharging will cause lithium dendrites, and overdischarging will cause copper dendrites, which will cause lithium batteries to short circuit and malfunction. Problem: lithium batteries therefore require superficial charging and discharging. At present, when using lithium batteries, protection circuits should be installed as much as ppossible to guarantee safety. At the same time, lithium iron phosphate battery is a relatively safe type of lithium battery.

When overcharging, the battery voltage increases rapidly with increasing polarization, which will cause irreversible changes in the structure of the positive active material and decomposition of the electrolyte. A large amount of gas will appear and one. A large amount of heat will be released, causing the battery temperature to decrease. The internal pressure increases sharply, and the internal diaphragm melts or shrinks, causing the positive and negative electrode materials to contact and short circuit, causing explosion, combustion and other hidden dangers.

Over-discharge: Over-discharge refers to further discharge when the voltage reaches the rated voltage. For example, the rated discharge voltage of a lith batteryium-ion ternary is 3.2V if it continues to discharge. when it is less than 3.2V, it is over-discharge. What damage does over-discharging cause to the battery?

Once the battery has discharged the internally stored energy and the voltage has reached a certain value, continued discharge will cause the battery to overdischarge which can have catastrophic consequences for the battery, especially excessive current discharge. Repeated excessive discharge will have a greater impact on the battery. Generally speaking, excessive discharge will increase the internal pressure of the battery, destroy the reversibility of positive and negative active materials, decompose the electrolyte, deposit lithium on the negative electrode, and increase resistance. Even if it is loaded, it can. will only be partially restored, and the capacity will also be significantly attenuated.

One: usez a special protection board (BMS) for lithium-ion batteries to work with the battery. The protection board can protect the battery from overcharging or overdischarging. The smart version can also adjust the charging voltage. and discharge voltage, which can better protect the battery.

Second: Use the corresponding lithium-ion battery charger instead of fast charging.

Three: When the battery voltage reaches the voltage set by the protection board, the protection board cuts off the power to protect the battery, but the lithium-ion battery drops and the voltage rises, which will be a little higher than the voltage set by the protection board. It can no longer be used at this time. Repeated use will cause irreversible damage to the battery.

The lifespan of lithium-ion batteries is determined. First of all, there is an objective fact whichcannot be changed, this is the lifespan of a cell phone battery. It is somewhat similar to the human lifespan. People who worry too much can lose years of their life. have good lifestyle habits, they can live for a few more years. The same goes for lithium-ion batteries. If you use them correctly, you can use them for a few more years, but if you mishandle them, their lifespan will be very short. Just like human life, no matter how hard you try, it will eventually end. The same goes for lithium-ion batteries. Over time, even if you don't use them, it will slowly age. Moreover, it is still irreversible aging, so if the mobile phone battery capacity has been lost, there is no way to restore it to the state of the new phone.

The operating principle of lithium-ion batteries is very simple. The load and the dcharge are actually chemical reactions inside the battery, regardless of the type, they will undergo the movement of ions from the negative electrode to the positive electrode. or from the positive electrode to the negative electrode, forming positive and negative electrodes. The polar compounds change as the reaction proceeds, and the loss of the battery is actually the reduction in ionic activity.

(Images/Text/Photos: Pacific Automotive Network Q&A)

To prevent excessive discharge or overcharging of the battery due to misuse, the unique lithium-ion battery is equipped with a triple protection mechanism. The first is to install a relief valve (i.e. the vent hole on the top of the battery). When the internal pressure of the battery reaches a certain value, the safety valve will automatically open to ensure the safety of the battery. The seconde is to select the appropriate separator material. When the temperature reaches a certain value, when the temperature rises, the micron-sized pores on the separator will automatically dissolve, preventing lithium ions from passing through and the internal reaction of the battery. The third is to use a switching element. As the temperature inside the battery increases, its resistance increases accordingly. When the temperature is too high, the power supply will automatically stop. Many people think that as long as we use lithium batteries correctly when using electronic products such as our portable speakers, that is enough. However, with so many users, it is inevitable that lithium batteries will be misused, causing unnecessary damage. lithium batteries appear. The above three protection mechanisms are installed tosolve the problem of excessive discharge or overcharge of the battery.

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