Do lithium-ion batteries need to be protected? The meaning of lithium-ion battery protection board

by:CTECHi     2021-09-21
Should Li-ion batteries be protected? The meaning of lithium-ion battery protection board. Generally, the battery has a protective board, and the use of the protective board is also for the safety of the battery. But different types of battery protection boards have different uses. The overcharge, overdischarge, overcurrent and short circuit protection of lithium-ion batteries is very important, so protection circuits are usually designed in the battery pack to protect the lithium-ion batteries. Should Li-ion batteries be protected? The reason why lithium-ion batteries (rechargeable) need to be protected is determined by their own characteristics. Because the material of the lithium-ion battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, and ultra-high temperature charging and discharging, the lithium battery components of the lithium-ion battery will always appear with an exquisite protection board and a current fuse. The protection function of lithium-ion battery is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage and charge and discharge circuit of the cell at all times under the environment of -40℃ to +85℃ Control the on and off of the current loop in time; PTC guards against severe damage to the battery in a high temperature environment. The function of the protection board is important to protect the cells of rechargeable lithium-ion batteries, maintain safety and stability during battery charging and discharging, and play an important role in the performance of the entire battery circuit system. Important functions of lithium-ion battery protection board 1) Overcharge protection function: The overcharge protection function refers to the prohibition of continuous charging by the charger when a certain voltage is reached. That is, the MOS tube that controls overcharge is turned off to stop charging. 2) Over-discharge protection function: The over-discharge protection function stops discharging the load when the battery voltage drops. The MOS tube that controls the over-discharge enters the off state, and it is prohibited from discharging. This process is just the opposite of the action during the overcharge test. 3) Over-current protection function: The over-current protection function is to stop discharging the load when a large current is consumed. The purpose of this function is to protect the battery and MOS tube to ensure the safety of the battery under working conditions. After the over-current test, the lithium-ion battery will return to its normal state after being separated from the load and can be recharged or discharged. The significance of the lithium-ion battery protection board We all know that lithium-ion batteries are not only composed of a battery cell. In addition to some basic components, there are some components that are additional, but they also occupy an important part of lithium-ion batteries. status. That is the lithium-ion battery protection board, as the name implies, it plays a protective role for lithium-ion batteries. Compared with traditional lead-acid batteries and nickel-metal hydride batteries, lithium-ion batteries have superior performance, long life, and environmental protection. But its stability is not as good as traditional batteries. In other words, safety issues have always been an important issue for high-performance batteries. The so-called 'things must be reversed' is exactly this truth. Lithium-ion battery is like this. Although the performance is very good, the safety problem has always been a big problem that people have already dealt with. Once a lithium-ion battery is short-circuited, it will catch fire or explode in the worst case, so the accidents that occur cannot be underestimated. To sum up, if you want to maximize the safety, life and performance of your lithium-ion battery, you need an accessory to ensure that the lithium-ion battery is short-circuited and overcharged and over-discharged. The three major aspects of the lithium-ion battery protection board are The basic functions are short circuit protection, overcharge protection and over discharge protection. So at this point, everyone can understand the significance of the lithium-ion battery protection board to the lithium-ion battery! So the two mentioned above are complementary and indispensable! Therefore, a protection circuit is usually designed in the battery pack to protect the lithium-ion battery, which shows the importance of the lithium-ion battery protection IC. The protection circuit of the lithium ion battery is to ensure the safety in such an overcharge and discharge state, and to guard against the deterioration of the characteristics. The protection circuit of the lithium ion battery is composed of a protection IC and two Power-MOSFETs.
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