Jingjieneng: feedback type lithium battery sub-capacitance testing equipment, the direction of the development

by:CTECHi     2021-07-25

Currently, lithium batteries are the most critical component in energy equipment, with a wide range of applications, such as mobile electronic equipment, power cars, etc. A part of the battery production process is capacity separation. Traditional linear lithium battery capacity separation testing equipment can hardly reach a satisfactory level in terms of energy consumption and performance. Under such a market background, the country's entry barriers to the lithium battery industry are constantly increasing, and the living space of traditional linear devices has become narrower. The traditional volumetric technique is a complete test. The specific process is: first fully charge the battery (to the highest set voltage), then empty the battery (to the lowest set voltage), and record the battery capacity and function during the discharge process. . Finally, recharge and charge to the set voltage.

The existing circuit architecture is shown in Figure 1

The architecture adopts linear constant current mode for charging and linear constant current mode for discharging. When charging, it uses a constant current method to charge, the charging efficiency is low, and the heat generation is large. The discharging process also uses the linear constant current mode, this mode uses the principle of heating to discharge the battery's electric energy without recycling, and the recovery rate is 0.

The feedback type capacitance separation technology is a development direction in the field of lithium battery capacitance separation detection. The specific architecture is shown in Figure 2

The architecture uses dual inverter power supply as the basis, and the battery is charged with constant current or constant voltage during charging, and the charging efficiency is high; the discharge process According to the actual situation, constant current or constant voltage discharge is also used, and the released energy is fed back to the AC grid for recovery; instead of directly using the heating method to directly consume the energy in the battery.

In the new field of lithium battery testing and feedback equipment, Shenzhen Jingjieneng Electronics Co., Ltd. (hereinafter referred to as Jingjieeng Company) has been committed to technological innovation for a long time. A major breakthrough was made in research and development. Domestic experts who provide lithium battery capacity classification testing solutions. Since its establishment, Jingjie Energy has been devoted to the research and development, production and sales of high-end feedback equipment. In the past eight years since its establishment, it has invested heavily in the introduction of international advanced technical equipment and research and development equipment to form a domestic First-class laboratories and expert teams are at the forefront of the domestic lithium battery capacity separation testing field.

Jingjie energy feedback type capacity separation equipment has significant advantages in reducing energy consumption and saving electric energy for enterprises. Compared with the traditional linear device, the feedback device effectively avoids the resistance consumption. Its working principle is: in the charging process, the feedback device first converts the alternating current into a 12V intermediate bus, and the latter-stage DC converter converts the 12V voltage into a voltage of about 3-4V to charge the battery. The efficiency of the front stage can reach 90% through the LLC converter, and the efficiency of the latter stage uses synchronous rectification, and the highest efficiency can reach 92%. Throughout the charging process, the overall efficiency can reach between 75% and 80%. In contrast to linear equipment, AC power is transformed into a 7V bus, the efficiency is 75%, and the latter stage uses a linear power supply. The working efficiency depends on the voltage difference between the input and output voltages. The average efficiency is 50%, and the total efficiency is 35%-40%. The discharging process is also similar to the charging process. Because they are all two-way power supplies, the feedback efficiency and charging efficiency of the feedback device are similar, ranging from 75% to 80%. When the linear power supply is discharged, all the battery energy is lost in the form of heat. The JJ Energy feedback equipment has been repeatedly tested and tested in practice, and from the test data of some battery cell factories, it can be seen that the total power consumption of a single cycle test includes the consumption of the three steps of charging, discharging, and recharging. Electricity, compared with the traditional linear capacity division equipment, saves about 50% of the electricity.

Take the 5V3A sub-capacity cabinet with 512 channels of Jingjie energy 18650 battery as an example, the battery specification is 2200mAH, the average voltage is 3.7V, and the energy required for full charge is 8.14 WH. It is estimated that the factory will work 24 hours a day. According to 0.5C charging and 1C discharging, plus other time in the test, there are 3 batches of capacitor charging and discharging every day, and the monthly working time is 26 days. The following table calculates the energy saved by the feedback type capacitor cabinet. Consumption and electricity bills. (Calculated based on the 80% efficiency of the feedback type capacity division cabinet and the 40% efficiency of the linear cabinet, the industrial electricity bill is 1.1 yuan/kWh)

As can be seen from the above table, the linear capacity division The annual electricity cost of the cabinet is 8796 degrees higher than that of the regenerative sub-capacity cabinet. The part of the table is idealized. In fact, the number of charge and discharge per day may be only 2.5 times, and it is impossible to completely discharge during the actual discharge. There is residual energy in the battery, assuming the actual electricity cost Taking into account the calculation of 60% of the electricity bill, the electricity bill saved is 5278 yuan. The electricity cost saved by each cabinet is at least 5,000 yuan per year. Compared with the linear sub-capacity cabinet and the feedback sub-capacity cabinet, the electricity cost saved in the three years of choosing Jingjie can already offset the difference in the price of the two cabinets.

Relying on the reputation of high quality and low price, Jingjie Energy shipped more than 1 million channels in 2016, saving a lot of electricity for lithium battery manufacturers and becoming a veritable 'energy saving expert' in the market. Jingjie can save a lot of electricity bills and reduce production costs for lithium battery companies. The subsequent automated production equipment will also save a lot of labor costs for the entire industry. It is a good example for other companies in energy-saving economy. The modernization drive has made its due obligations.

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