With the rapid development of society, our lithium battery protection board is also in rapid development, so do you know the detailed analysis of lithium battery protection board? Next, let me lead you to understand the relevant knowledge in detail.
Lithium battery protection board equalization principle commonly used equalization charging techniques include constant shunt resistance equalization charging, on-off shunt resistance equalization charging, average cell voltage equalization charging, switching capacitor equalization charging, buck converter equalization charging, inductive equalization charging, etc.. When charging lithium batteries in series in groups, each battery should be ensured to be charged in a balanced manner, otherwise the performance and life of the whole group will be affected during use.
It is necessary to take a balanced situation: in the case of battery production to complete the storage time longer, because of the different various static power protection plate and various battery self-discharge rate, forming the entire bundle, the battery voltage, with a significant pressure difference, but the same guarantee capacity, balanced conditions to balance the function of the battery pack voltage, can achieve the effect of fully charged and fully discharged battery capacity, so that the battery exerts a huge impact.
In the case of the battery pack production is completed and stored for a relatively long time, due to the different static power consumption of each circuit of the protection plate and the different self-discharge rate of each cell, the formation of the entire battery string battery voltage is not consistent, thus there is an obvious pressure difference, but the same guaranteed capacity, balanced on the battery pack has the function of balanced voltage, so that the effect of the battery pack capacity of full charge and full discharge can be achieved, so that the battery pack exerts a great effect The battery itself still has the available capacity, but because of the capacity of the battery, the battery can be fully charged and discharged.
The battery itself still has available capacity, but the battery system cannot continue to perform as it should because of the unbalance between the batteries and the limitation of the safety voltage set for the protection of the batteries. In addition, the life of the battery in the car is shorter than the life of the vehicle itself, even if the vehicle has not reached the end of life, but the battery has to be replaced to meet the power performance. However, the cost of replacing the battery is again quite high, so this has largely restricted the development of electric vehicles.
Equalization does not work: many people think that the battery in the use of balanced medium and late work, the actual use of the battery pack, medium and late due to different battery capacity loss, resulting in poor capacity, balanced protection plate is not able to make up for the battery capacity, the apparent battery pack voltage of each string is consistent, but due to inconsistent capacity, the low is often in the charging and discharging capacity of the battery of the single string discharge protection and over Charge protection, so the capacity of the battery is in the single string of the battery of low capacity.
The case of equalization can not be used: many people think that the battery pack in use to the middle and late when the equalization has a use, in fact, the battery pack in use to the middle and late, due to the different capacity loss of each cell, causing a capacity difference, relying on the protection plate equalization is not able to make up for the capacity of the cell, on the surface the voltage of each string of the battery pack is the same, but because of the inconsistency of the capacity, in charging and discharging is often a single string of low capacity However, due to the inconsistency of the capacity, it is often the single string cell with low capacity that is over discharged and over charged first, so the capacity of the battery pack is also reflected by the single string cell with low capacity.
Passive equalization is generally done by resistive discharge, which discharges the higher voltage battery to release power in the form of heat to buy more charging time for other batteries. This way the power of the whole system is limited by the battery with the least capacity. During charging, lithium batteries generally have a charging upper limit protection voltage value, when a 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.
The above is a detailed analysis of the knowledge of lithium battery protection board, you need to continue to accumulate experience in practice, so as to design a better product for the better development of our society.
