Author ：Iflowpower – Portable Power Station Supplier
In life, you may not have access to a wide variety of electronic products, then you may not understand some of its components, such as the lithium-ion battery pack thereof, then let Xiaobian lead everyone to learn lithium ions together Battery group balance charging. Balance is a key technique to solve the difference in battery cells. For lithium-ion batteries, each lithium-ion battery requires charging overvoltage, discharge under voltage, overcurrent, short circuit protection, and the full set of batteries during charging.
Balanced charging problem. Charge balance (abbreviation is equal charge) is charged for balancing battery characteristics. It refers to the imbalance of battery terminal voltage due to individual differences and temperature differences due to battery during the battery.
In order to prevent the deterioration of this imbalance, it is necessary to add a battery pack's charging voltage and activate the battery and charge it to balance the characteristics of each battery in the lithium-ion battery pack and extend the maintenance of the battery. Common balanced charging technologies include constant parallel resistance equalization, switch parallel resistance equalization, and average battery voltage equalization charging, switching capacitor equalization charging, step-down converter equalization charging, inductance equalization charging, etc. When charging a group of lithium, make sure that each battery is charged in a balanced manner, otherwise it will affect the performance and life of the entire unit during use.
Existing single lithium ion battery protection chip does not have a balanced charging control function. Balance charging control function of multi-segment lithium-ion battery protection chip is an external CPU. It is implemented by serial communication with the protective chip, which has increased the complexity of the protection circuit.
The degree and difficulty of design reduces the efficiency and reliability of the system, and adds power consumption. The meaning of the balance of lithium dynamic lithium ion battery is to maintain the voltage deviation of the lithium ion lithium-powered lithium ion battery cell or lithium-ion lithium ion battery cell in the expected range using power electronics, ensuring that each lithium power lithium ion battery cell is expected. Within range.
Keep the same state during normal use to prevent excessive charging and excessive discharge. If the balance control is not performed, with the new increase of the charging and discharge cycle, the voltage of each lithium-powered lithium-ion battery will gradually be different, and the service life will be greatly reduced. In the process of assembling the vehicle using the assembled lithium power lithium ion battery, the monomer inconsistent phenomenon occurs due to the degree of self-discharge and the temperature of the components.
The inconsistency of lithium dynamic lithium-ion battery monomers affect lithium-powered lithium-ion battery pack. Charge and discharge. Studies have shown that 20% difference in lithium-powered lithium-ion battery pack will bring 40% of the capacity loss of lithium-powered lithium-ion battery pack.
In the case where the relatively long storage time for the production of the lithium ion battery pack, since the static power consumption of each circuit of the protective plate and the self-discipline of each of the battery cells are different, the voltage of the battery pack of the battery pack Decrease. The entire battery group is inconsistent. Balance has a function of balancing the voltage equalization of the lithium ion battery pack to achieve full charge and complete discharge of the battery pack capacity, thereby enabling the battery pack to play the maximum use.
Commonly used lithium-ion battery equilibrium charging techniques include constant parallel resistance equalization, switch parallel resistance equalization, and average battery voltage equalization charging, switching capacitor equalization charging, step-down converter equilibrium charging, inductance equalization charging, etc. When the battery is connected in series, it should balance and charge, otherwise it will affect the performance and life of the entire battery pack during use. The consistency between the lithium-powered lithium-ion battery cell is the most direct and important effect on lithium power lithium ion battery capacity, because the capacity of lithium power lithium ion battery cannot be directly measured in a short period of time, but lithium tension lithium The monomer capacity of the ion battery corresponds to its open circuit voltage.
The voltage of the lithium-powered lithium ion battery cell can be measured in real time, and favorable conditions for measuring the concentration level of lithium-powered lithium-ion battery cells. In the management strategy of the battery management system, there is a discharge termination condition, a charging termination condition, and the like, wherein the voltage value of the lithium power lithium ion battery unit is used as trigger conditions. The parameters at this location are excessive differences of the voltage consistency of the lithium power lithium ion battery cells directly limit the charging and discharging power of lithium-powered lithium-ion battery pack.
Based on this, the use of lithium-powered lithium ion battery equilibrium to solve the problem of excessive voltage differences in the lithium-powered lithium ion battery pack, which is to improve lithium battery capacity. Effective measures. Lithium-ion battery pack, extend service life.
Lifeline lithium-ion battery life life. I believe that by reading the above content, everyone has a preliminary understanding of the balanced charging of lithium-ion battery packs. At the same time, I hope that everyone will summarize in the process of learning, so they can constantly improve their design level.
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