Comparison of the difference between passive balancing and active balancing of 2025 button cell battery protection board

The difference between passive balancing and active balancing of 2025 button cell battery protection board. The lithium battery protection board, which plays an important role in the battery system, is an effective means to extend the battery life and has gradually gained everyone's attention. Among them, the lithium battery protection board balancing system, which plays a key role, has also attracted widespread attention. At present, there are two ways to balance multi-series battery systems on the market: traditional passive balancing and active balancing. Active balancing and passive balancing are one of the hot topics in the electric vehicle industry. It is very similar to the Qi Zong and Jian Zong of Huashan Sword Sect. The industry is arguing happily, but the outsiders are confused. The following editor will take you to understand the passive balancing and active balancing of 2025 button cell battery protection board and what is the difference between them! The principle of 2025 button cell battery protection board The reason why the lithium battery protection board principle (rechargeable type) needs protection is determined by its own characteristics. Because the material of the lithium battery protection board principle itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited and ultra-high temperature charged and discharged, the lithium battery lithium battery component will always appear with a delicate protection board and a current fuse. The protection function of lithium battery is usually completed by the protection circuit board and PTC. The protection board is composed of electronic circuits. It can accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at any time in an environment of -40℃ to +85℃, and control the on and off of the current circuit in real time; PTC prevents the battery from being severely damaged in a high temperature environment. The principle of the protection board of 2025 button cell battery usually includes control IC, MOS switch, resistor, capacitor and auxiliary devices NTC, ID memory, etc. Among them, the control IC controls the MOS switch to turn on under normal circumstances, so that the battery cell communicates with the external circuit. When the battery cell voltage or loop current exceeds the specified value, it immediately (tens of milliseconds) controls the MOS switch to turn off to protect the safety of the battery cell. NTC is the abbreviation of Negative temperature coefficient, which means negative temperature coefficient. When the ambient temperature rises, its resistance decreases, and the electrical equipment or charging equipment responds in time, controls the internal interruption and stops charging and discharging. ID memory is often a single-line interface memory. ID is the abbreviation of Identification, which means identity recognition, and stores information such as battery type and production date. It can play a role in product traceability and application restrictions. Understand the passive and active balancing of the 2025 button cell battery protection board. Passive balancing generally discharges the 2025 button cell battery with higher voltage by means of resistance discharge, releases electricity in the form of heat, and buys more charging time for other batteries. In this way, the power of the entire system is restricted by the battery with the smallest capacity. During the charging process, lithium batteries generally have a charging upper limit protection voltage value. When a certain string of batteries reaches this voltage value, the lithium battery protection board will cut off the charging circuit and stop charging. If the voltage during charging exceeds this value, which is commonly known as "overcharge", the lithium battery may burn or explode. Therefore, lithium battery protection boards generally have overcharge protection functions to prevent overcharging of batteries. Active balancing of the 2025 button cell battery protection board is balanced by power transfer, which is efficient and has low loss. Different manufacturers have different methods, and the balancing current ranges from 1 to 10?A. Many active balancing technologies currently on the market are immature, resulting in over-discharge of batteries and accelerated battery attenuation. Most active balancing on the market adopts the principle of transformer, relying on expensive chips from chip manufacturers. In addition to the balancing chip, this method also requires expensive peripheral components such as transformers, which are large in size and high in cost. The difference between passive balancing and active balancing of the 2025 button cell battery protection board Because the two balancing functions have their own advantages and disadvantages, the active balancing function can replace the passive balancing function, but because of the complex structure and high cost, and the high failure rate after the complex structure, it is in a stalemate with the passive balancing, and industry insiders often argue about which balancing is better. This actually proves the truth that any technical choice must be applicable to the overall conditions. The consistency itself is very good, and the consistency difference is limited during the life span, so passive balancing is enough. Passive balancing is suitable for small-capacity, low-string 2025 button cell battery pack applications, and active balancing is suitable for high-string, large-capacity power lithium battery pack applications. In addition to the balancing function is very important, the balancing strategy behind it is even more important. When the consistency difference of the battery cells is within a certain range, the battery power and voltage are positively correlated; but when the consistency of the battery is far worse, that is, when there are batteries in a damaged state, the correlation between the power and voltage is not so strong. At this time, the basis for balancing cannot be judged by the voltage data alone. If you don't realize that the battery is damaged below the critical state, and you still balance it according to the voltage, it will cause damage to the 2025 button cell battery, especially active balancing, because its large current will cause more damage than passive balancing. This is worthy of all manufacturers' vigilance, and both the balancing method and the balancing strategy need to be taken seriously. According to the Huashan Sword School, the Qi Sect practices Qi in order to finally control the sword with Qi and achieve unity of mind and sword. In comparison, active balancing and passive balancing can both be considered as the Sword Sect, one is a light sword and the other is a heavy sword, and the balancing strategy is considered as the Qi Sect. Only by practicing Qi and sword together can we compete in the market.

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