lithium 3400mah 3.7v 18650 battery

　　The importance of lithium 3400mah 3.7v 18650 battery protection circuit

　　The importance of lithium 3400mah 3.7v 18650 battery protection circuit. At present, when using lithium iron batteries, protection circuits should be installed as much as possible to ensure safety. At the same time, lithium iron phosphate battery is a relatively safe type of lithium battery. Don't wait until there is a problem with the battery before you think of a solution. The most important thing is to pay attention to and maintain the battery on a daily basis.

　　The importance of lithium 3400mah 3.7v 18650 battery protection circuit

　　Due to the high energy density of lithium iron batteries, when the battery temperature rises in the overcharged state, the energy will be excess, so the electrolyte decomposes to produce gas, which can easily increase the internal pressure and cause the risk of spontaneous combustion or rupture; conversely, in the overdischarged state, , the decomposition of the electrolyte leads to the deterioration of battery characteristics and durability, reduces the number of recharges, and shortens the service life of the battery. Therefore, the protection of lithium iron batteries is very important. Lithium battery applications must have battery protection chips to prevent overcharge, overdischarge and overcurrent of the battery.

　　The design of the lithium 3400mah 3.7v 18650 battery protection circuit is very important. However, the lithium battery protection circuit will increase the additional loss of battery energy and reduce the battery's application time. This requires the lithium battery protection circuit to achieve low power consumption with high precision. In addition to completing basic functions such as overcharge protection, over-discharge protection and over-current protection, a lithium battery protection chip must also meet the following requirements:

　　(1) Ultra-low power consumption. When the lithium 3400mah 3.7v 18650 battery protection circuit is working, the power consumption it consumes is the loss of the battery. Therefore, we need to minimize the power consumption of the lithium battery protection circuit.

　　(2) Highly accurate voltage detection. In order for the lithium battery protection circuit to respond correctly to different working states of the battery, the protection circuit must be able to accurately detect voltage parameters such as overcharge protection voltage and over-discharge protection voltage.

　　(3) Works correctly under a wide voltage range. Since the power supply voltage of the lithium 3400mah 3.7v 18650 battery protection circuit is the battery voltage, and the battery voltage can float within a wide range, the lithium battery protection circuit is required to work correctly within this voltage range.

　　When a lithium battery is overcharged, the electrolyte will be decomposed, causing the temperature and pressure inside the battery to rise; when overdischarged, the electrolytic material in the negative electrode, copper, will melt and cause an internal short circuit, causing the temperature to rise. In addition, if the lithium battery is excessively discharged, the electrolyte in the battery will change, and the number of recharge cycles will be reduced, thereby affecting the service life of the lithium battery.

　　Since lithium iron batteries have the shortcomings analyzed above, a protection circuit must be added to the application of lithium batteries. The basic functions of the protection circuit must also correspond to the above shortcomings, so we require the lithium battery power protection chip to be able to achieve the following most basic functions: overcharge protection, over-discharge protection, over-current protection and short-circuit protection. From the above application requirements of lithium batteries, it can be seen that in order to improve the service life of lithium batteries and ensure the safe use of batteries.

　　Lithium battery protection circuit needs to have the following functions

　　(1) If the charging voltage exceeds the maximum allowed value of the battery, a battery discharge circuit can be provided.

　　(2) If the discharge voltage is lower than the minimum allowed value of the battery, a battery charging circuit can be provided. The battery is disconnected from the external circuit, and the battery is disconnected from the external circuit.

　　(3) If the charging and discharging current of the battery is greater than the limit value, cut off the connection between the battery and the external circuit.

　　(4) When the lithium 3400mah 3.7v 18650 battery returns to normal state, the protection circuit should be able to release the protection state accordingly so that the battery can continue to work normally.

　　The protection circuit of lithium-ion batteries ensures safety in such overcharging and discharging states and prevents deterioration of characteristics. Protection against overcharge, over-discharge, over-current and short-circuit of lithium batteries is very important, so protection circuits are usually designed in the battery pack to protect lithium batteries. The purpose of lithium battery protection IC is to prevent overcharging.

　　In terms of functions, protection ICs do not need to integrate all functions. A single protection IC can be developed based on different lithium battery materials. For example, it only has overcharge protection or over-discharge protection functions, which can significantly reduce cost and size.

　　The protection function of iron lithium battery is usually completed by the protection circuit board and PTC. The protection board is composed of electronic components. All lithium batteries require a protection circuit to effectively monitor the charging and discharging status of the battery, and in some cases Under certain conditions, turn off the charging and discharging circuit to prevent damage to the battery.

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