Analysis of fast charging and equalization charging implementation of dynamic lithium ion battery

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

With the rapid development of society, our lithium-ion-powered lithium battery is also rapidly developing. So you understand the detailed information of lithium-ion power lithium battery? Next, let Xiaobian lead everyone to learn more about knowledge. Lithium ion powered lithium battery in mobile phone, laptop, cameras, cameras, etc.

, partially replaced traditional batteries. Large-capacity lithium-ion batteries have been tried in electric vehicles, which will become one of the important power of electric vehicles in the 21st century, which has been applied in artificial satellites, aerospace and storage. Lithium manganate, lithium iron phosphate, etc.

For the power lithium battery of the positive material, it is unregistered to the lithium ion power lithium battery, each has an advantage, is a new generation of lithium ion power lithium battery development trends. In order to better protect the performance of the lithium-ion battery, the lithium-ion battery usually requires control of the charging process to four stages: Trick flow charge (low pressure precharge), constant current charging, constant voltage charging and charging termination. In order to realize the automatic control of segment constant current charging, the parameters of the constant current charging termination can be selected to select charging time, battery temperature and battery voltage.

Segmentation constant current charging method Realizes the fast and equalization of the charging method of the power lithium ion battery in the charging method of the charging lithium ion battery, which is constant pressure, controlled by IC chip. A typical charging method is: first detect the voltage of the battery to be charged. If the voltage is lower than 3V, please precharge first, then set the charging current.

1/10 of constant current, after the voltage rises to 3V, enter the standard charging process. The standard charging process is: constant current charging at a set current, when the battery voltage rises to 4.20V, change to constant voltage charging, and keep the charging voltage at 4.

20V. At this time, the charging current gradually decreases, and when the current drops to 1/10 of the set charging current, the charging ends. Based on the four traditional charging methods, a variable current rapid charging method is proposed.

It is important to divide three stages: small current Trick flow charge, segment constant current charging and pulse charging. In the segmentation constant current charging phase, the capacity control method is used to control the charging current of the lithium ion battery, so that it keeps the best charging curve close to the battery. Segment constant current charging The actual charging current curve of the lithium ion battery is close to the charge-accepted current curve, which is an effective method for realizing rapid charging of batteries.

The capacity gradient method is used to determine the standard parameters of the termination of constant current charging, reduce the gradient of the step constant flow charge, and supplemented by the protection control of the charging when the battery temperature is too high, and the smart charging of the power lithium-ion battery can be realized. Control and balance charging. The selection of fast charging method Adds charging current will add the amount of active substance recovered per unit time on the lithium ion battery board, and can shorten the charging time, but too much charging current can damage the battery.

The acceptable charging current of the battery is limited and the exponential decreases with the charging time. The ideal fast charging process for lithium-ion batteries is that the charging current is always maintained on the limit value of the battery charge acceptance current. Segmentation constant current charging control method 1 with capacity gradient method determination stage constant current charging termination standard.

2 reducing the fall slope of the constant current value of each part. 3 Set the battery temperature to control parameters to ensure the safety of charging. Constant current charging means that when the battery voltage rises above the flow charge threshold, the charging current will add to a constant current charging.

The current of constant current charging is between 0.2c to 1.0c, and the battery voltage gradually increases with the constant current charging process.

Usually, the voltage set for the single battery is 3.0-4.2V.

Power Lithium Ion Battery constant current charging by IC chip. First detect the voltage of the battery to be charged. If the voltage is below 3V, it is precharged.

The charging current is 1/10 of the set current, and the voltage rises to 3V. Enter the standard charging process. Segment constant current charging The actual charging current curve of the lithium ion battery is close to the charge-accepted current curve, which is an effective method for realizing rapid charging of batteries.

The capacity gradient method is used to determine the standard parameters of the termination of constant current charging, reduce the gradient of the step constant flow charge, and supplemented by the protection control of the charging when the battery temperature is too high, and the smart charging of the power lithium-ion battery can be realized. control. The constant current charging control method can effectively shorten the charging time, improve charging efficiency, and extend the life of the lithium-ion battery.

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