“With the rapid development of society, our lithium battery protection board is also developing rapidly, so do you know the detailed information analysis of lithium battery protection board? Next, let Xiaobian lead you to understand the relevant knowledge in detail.
With the rapid development of society, our lithium battery protection board is also developing rapidly, so do you know the detailed information analysis of lithium battery protection board? Next, let Xiaobian lead you to understand the relevant knowledge in detail.
Balanced charging techniques commonly used in the equalization principle of lithium battery protection boards include constant shunt resistance equalization charging, on-off shunt resistance equalization charging, average battery Voltage equalization charging, switched capacitor equalization charging, buck converter equalization charging, Inductor equalization charging, etc. When a group of lithium batteries is charged in series, it should be ensured that each battery is charged equally, otherwise the performance and life of the entire group of batteries will be affected during use.
It is necessary to take a balanced situation: in the case of battery production, the completion of the storage time is longer, because of the different various static power protection plates and various battery self-discharge rates, the formation of the entire bundle, the battery voltage, has a significant voltage difference, but The same guarantee ability, the function of balancing the voltage of the battery pack under the condition of balance, can achieve the effect of fully charged and fully discharged battery capacity, so that the battery exerts a huge influence.
In the case of a long storage time after the production of the battery pack, due to the difference in the static power consumption of each circuit of the protection board and the different self-discharge rate of each cell, the voltage of each string of batteries in the entire battery group is inconsistent, resulting in an obvious voltage difference. , but in the case of ensuring the same capacity, the balance has the function of balancing the voltage of the battery pack, so that the full charge and full discharge of the battery pack capacity can be achieved, so that the battery pack can play a large role.
The battery itself still has usable capacity, but the battery system cannot continue to perform as it should due to the imbalance between the batteries and the limitation of the safe voltage set to protect the battery. In addition, the service life of the battery on the vehicle is shorter than that of the vehicle itself. Even if the vehicle has not reached the end of life, the battery needs to be replaced to meet the power performance. However, the cost of replacing the battery is quite high, so this largely restricts the development of electric vehicles.
Balance does not work: Many people think that the battery is working in the middle and late stages of the use of balance, the actual use of the battery pack, the middle and late stage due to different battery capacity losses, resulting in poor capacity, the balance protection plate is unable to make up for the capacity of the battery, on the surface The battery pack voltage of each string is consistent, but due to the inconsistency in capacity, the low is often the single-string discharge protection and overcharge protection of the battery in the charging and discharging capacity, so the capacity of the battery is in the low-capacity battery. single string.
The situation where the balance is not useful: Many people think that the battery pack is useful in the middle and late stages of use. In fact, when the battery pack is used in the middle and late stages, due to the different capacity loss of each cell, a capacity difference is caused. The balance of the protection board cannot compensate for the capacity of the cells. On the surface, the voltages of each string of the battery pack are consistent, but due to the inconsistency of the capacity, the single-string cells with low capacity are often over-discharged and over-charged during charging and discharging. Therefore, the capacity of the battery pack is reflected in a single string of cells with low capacity.
Passive balancing generally discharges batteries with higher voltages by means of resistance discharge, releasing power in the form of heat, and obtaining more charging time for other batteries. In this way, the power of the entire system is limited by the battery with the least capacity. During the charging process, the lithium battery generally has 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.