Keyword search: battery plant ,  lithium battery factory ,  power bank works ,  lifepo4 battery mill ,  Pallet Trucks LiFePO4 Battery,  LiFePO4 Pallet Trucks Battery,  Lithium Pallet Trucks Battery, 

After the new battery is put into use, it must be regularly charged and discharged. The purpose of charging is to enable the battery to store electrical energy and restore its capacity in a timely manner to meet the needs of electrical equipment. The purpose of discharge is to timely test the capacity parameters of the battery and promote the activation reaction of electrode active substances. The quality of battery charging and discharging will directly affect the electrical performance and service life of the battery. There are currently many methods for charging batteries, and choosing a scientifically reasonable charging method will greatly improve the maintenance efficiency of batteries.

1. Common charging methods for batteries

1) The constant current charging method, which keeps the charging current constant during the charging process, is called the constant current charging method, abbreviated as the constant current charging method or the constant current charging method. During the charging process, as the battery voltage gradually increases and the charging current gradually decreases, in order to maintain the charging current from decreasing due to the increase in battery terminal voltage, the charging process must gradually increase

The power supply voltage is required to maintain a constant charging current, which requires a high level of automation for charging equipment. Generally, simple charging equipment cannot meet the requirements of constant current charging. Constant current charging method, under the maximum allowable charging current of the battery, the larger the charging current, the shorter the charging time. If considering time, adopting this method is advantageous. But in the later stage of charging, if the charging current remains unchanged, at this time, most of the current is used for

On electrolytic water, the electrolyte produces too many bubbles and appears boiling, which not only consumes electrical energy, but also easily causes a large amount of active substances on the electrode plate to fall off, resulting in a high temperature rise and causing the electrode plate to bend, rapidly reducing capacity and scrapping in advance. So, this charging method is rarely used.

2) The constant voltage charging method, in which the charging voltage remains constant during the charging process, is called the constant voltage charging method, abbreviated as the constant voltage charging method or the equal voltage charging method. Due to the constant voltage charging from the beginning to the later stage, the power supply voltage remains constant, so the charging current is quite large at the beginning of charging, greatly exceeding the normal charging current value. But as the charging progresses, the battery terminal voltage gradually increases and the charging current gradually decreases. When the terminal voltage of the battery is equal to the charging voltage, the charging current decreases to the minimum or even zero. From this, it can be seen that the advantage of using constant voltage charging method is that it can avoid excessive charging current in the later stage of charging, which may cause the shedding of active materials on the electrode plate and the loss of electrical energy. But its disadvantage is that at the beginning of charging, the charging current is too large, and the volume of the electrode active material changes and contracts too quickly, affecting the mechanical strength of the active material and causing it to fall off. However, in the later stage of charging, the charging current is too small, which prevents the active substances deep in the electrode from receiving charging reaction, resulting in long-term insufficient charging and affecting the service life of the battery. So this charging method is generally only suitable for special occasions without power distribution equipment or with relatively simple charging equipment, such as charging batteries in cars, from 1 to 5

The charging of dry battery type small batteries adopts the equal pressure charging method. When using the equal pressure charging method to charge a battery, the required power supply voltage is around 2.4-2.8V for each individual battery of an acidic battery, and around 1.6-2.0V for each individual battery of an alkaline battery.

3) Fixed

The constant voltage charging of resistors is a method used to remedy the drawbacks of constant voltage charging. That is, in the

A resistor is connected in series between the charging power supply and the battery, so that the initial charging current can be adjusted. But sometimes the maximum charging current is limited, so as the charging process progresses, the battery voltage gradually increases while the current almost decays in a straight line. Sometimes two resistance values are used, approximately at 2.4V, to switch from low resistance to high resistance in order to reduce venting.

4) The stage constant current charging method combines the characteristics of constant current and constant voltage charging methods. In the early stage of charging, the battery uses a larger current, and after a period of time, it switches to a smaller current. In the later stage of charging, it uses a smaller current, that is, the method of constant current charging at different stages with different currents is called stage constant current charging. The stage constant current charging method can generally be divided into two stages or multiple stages. The stage current charging method requires short charging time and good charging effect. Due to the use of lower current charging in the later stage, it reduces the erosion of active substances by bubbles on the electrode plate and reduces the detachment of active substances. This charging method can prolong the service life of batteries, save energy, and charge thoroughly, so it is currently a commonly used charging method. Generally, batteries are charged at a rate of 10 hours in the first stage, and at a rate of 20 hours in the second stage. The length of charging time at each stage, as well as the specific requirements and standards for various batteries, vary. 5) The charging method for batteries used intermittently or only in the event of an AC power outage is float charging. Fixed batteries used in some special occasions generally use float charging method to charge the batteries. The main advantage of float charging method is that it can reduce the gas evolution rate of the battery and prevent overcharging. At the same time, due to the similarity between the battery and

DC power supply is connected in parallel, and when the electrical equipment is using high current, the battery instantly outputs a large current, which helps to stabilize the voltage of the power system and ensure that the electrical equipment is using electricity normally. The disadvantage of float charging method is that some batteries are charged unevenly and under charged, so regular balanced charging is required.

Fast charging method for 2 batteries

1) The characteristic of the fixed current and fixed period fast charging method is that the battery is charged with a pulse charging current with constant current amplitude and period. There is a discharge pulse between the two charging pulses for depolarization to improve the charging acceptance capacity of the battery. During the charging process, the charging current and its pulse width are not affected by the charging state of the battery. Therefore, it is an open-loop pulse charging. This charging method is easy to fully charge the battery, but if it is not increased to prevent overcharging

The protective device can easily cause strong overcharging and affect the service life of the battery. In this charging method, although depolarization measures are added throughout the entire charging process, this fixed depolarization measure is difficult to meet the requirements of the entire charging process.

2) The characteristic of this charging method is that the amplitude of the charging current pulse and the discharge rate of the battery remain constant throughout the entire charging process. At the beginning of the charging process, the charging current is slightly lower than the initial receiving current of the battery. During the charging process, due to the gradual decrease in the acceptable current of the battery, after a period of time, the charging current will exceed the acceptable current of the battery, resulting in the production of more gas inside the battery and a significant increase in gas output rate. At this point,

The gas detection element can send out control signals in a timely manner, forcing the battery to stop charging and perform short-term discharge. In this way, the polarization effect inside the battery quickly disappears, so the gas output rate can always be maintained at a lower predetermined value. At present, there are such plans abroad. Due to the lack of gas sensitive components in China, there is little research on this method.

3) The characteristic of this charging method is to charge with a constant high current and discharge at a certain voltage (equivalent to the voltage at the discharge point of the battery), stop charging and perform high current (or low current) discharge depolarization. Then, charge with a constant high current, and the charging and discharging processes alternate accordingly. The frequency of discharge pulses increases with the increase of charging capacity, while the width of charging pulses decreases with the increase of charging capacity. When the charging and discharging amounts are basically equal, it indicates that the battery is fully charged and immediately ends charging. According to this method, there are various solutions both domestically and internationally to achieve fast charging of batteries. This method has no depolarization measures during the initial charging stage. After adding depolarization measures, the charging pulse width continuously decreases, resulting in a faster decrease in the average charging current and prolonging the charging time.

4) The depolarization fast charging method of constant current and voltage pulse charging and discharging is an improvement of the depolarization fast charging method of constant current and voltage pulse charging and discharging. It charges at a constant current (such as IC), and when the battery voltage reaches the charging outlet voltage (single cell battery voltage 2.35-2.5V), it stops charging and discharges (such as a discharge current of 2-3C with a pulse width of 1ms), and then charges again. After adding discharge depolarization pulses, use an integrating device to track and increase the charging control voltage (increase the outlet voltage) in a stepped manner, in order to accelerate the charging speed and improve the degree of full charge. Other methods are the same as the constant current and voltage method.

5) The characteristic of this method is that the voltage amplitude of the charging pulse remains constant. As the charging process progresses, the electromotive force of the battery gradually increases, the charging current amplitude gradually decreases, and the frequency of the charging pulse current remains constant. A discharge depolarization pulse is added between the two charging pulses.

6) The characteristic of this method is to select the frequency of charging and discharging pulses based on the polarization situation during the battery charging process, and to limit the terminal voltage of the battery to a pre-selected value in the later stage of charging, so as to limit the gas output rate to a certain allowable value.

7) The characteristic of this method is to add depolarized discharge pulses in a timely manner throughout the entire charging process. Before the charging current recovers after the discharge pulses, the depolarization effect is tested to achieve a certain depolarization effect before returning to charging. Otherwise, depolarization discharge is carried out again until the required depolarization effect is achieved before returning to charging. This allows the depolarization measures to adapt to the entire process. This scheme can effectively suppress the amount of gas precipitation within a very small value.

The ideal charging method for 3 batteries in China's conventional charging system is an unreasonable charging method that is forced to be adopted due to a lack of understanding of charging laws. The drawbacks of conventional charging methods are long charging time, low efficiency, large gas output, and low utilization turnover rate of batteries

The charging management system is complex and so on. There is a certain contradiction between the backwardness of this charging system and the widespread application of batteries. Therefore, in the field of charging, it is necessary to strengthen the understanding and research of charging laws, gradually explore a set of fast and good charging systems, so that batteries can adapt to the needs of economic development and special construction in various departments.

1) The three-stage charging method currently uses the stage constant current charging method for charging special batteries. Generally, acidic special batteries use a constant current two-stage charging method. Alkaline special batteries adopt the constant current two-stage charging method or the constant current one-stage charging method. But this charging method moves away from the charging current acceptance curve in the middle stage of charging, so the three-stage charging method is better.

The three-stage charging method is a combination of two-stage constant current charging and constant constant voltage charging. At the beginning and end of charging, a constant current is used, and the middle stage is constant voltage charging. In the initial stage of charging, the battery uses a larger current and after a period of time changes to a constant voltage for charging. When the current decays to a predetermined value, it transitions from the second stage to the third stage. The advantage of using the three-stage charging method is that it avoids the situation where the starting charging current of the constant voltage charging method is too large and the later current is too small, which is closer to the charging current acceptance rate curve in the middle stage than the two-stage constant current charging method. This charging method reduces the gas output during charging, ensures thorough charging, and extends the service life of the battery. The three-stage charging method changes the charging current and voltage

Lithium Batteries ,Ensure Quality

Our lithium battery production line has a complete and scientific quality management system

Ensure the product quality of lithium batteries

Years of experience in producing lithium batteries

Focus on the production of lithium batteries

WE PROMISE TO MAKE EVERY LITHIUM BATTERY WELL

We have a comprehensive explanation of lithium batteries

QUALIFICATION CERTIFICATE

THE QUALITY OF COMPLIANCE PROVIDES GUARANTEE FOR CUSTOMERS

MULTIPLE QUALIFICATION CERTIFICATES TO ENSURE STABLE PRODUCT QUALITY

Providing customers with professional and assured products is the guarantee of our continuous progress.

Applicable brands of our products