With the transformation of the global energy structure and the development of a low-carbon economy, new energy technology is becoming an important force in promoting social progress. Among many new energy technologies, the progress of battery technology is particularly eye-catching. As an emerging battery technology, semi-solid-state batteries are becoming the pioneer of the new energy era with their excellent performance and wide application prospects.
Semi-solid batteries significantly improve battery safety by reducing the use of liquid electrolytes and reducing the risk of chemical reactions in batteries under high temperature conditions. This is particularly important for applications such as electric vehicles that require long-term, high-power output. At the same time, compared with traditional liquid batteries, semi-solid batteries have higher energy density and can provide longer battery life.
Recently, Topwell has obtained a 31Ah semi-solid battery from Beijing Welion New Energy Technology Co., Ltd. (Welion New Energy for short). Welion New Energy is a solid-state battery industry-university-research incubator of the Institute of Physics, Chinese Academy of Sciences. It was established in 2016 and has more than 40 years of solid-state battery industry research experience. Achieving "first" breakthroughs in multiple solid-state lithium battery technology fields, it has brought together highly sophisticated talents in the fields of battery materials, cells, systems, etc. Let's take a look at the actual performance of this battery cell.
Appearance Introduction
Welion New Energy's 31Ah semi-solid-state battery has an overall rectangular structure and is encapsulated with a conventional aluminum-plastic composite film, with the positive and negative electrode sheets exposed on the sides.
The front has the factory code and positive and negative polarity markings.
There is no printing code or logo on the back.
The length of Welion New Energy’s 31Ah semi-solid-state battery is approximately 20.5mm.
The width of Welion New Energy's 31Ah semi-solid-state battery is approximately 87.2mm.
The thickness of Welion New Energy 31Ah semi-solid-state battery is approximately 11.2mm.
Welion New Energy 31Ah semi-solid battery weighs approximately 417.2g.
Comparison of Weilan New Energy 31Ah semi-solid-state battery in the hands of an adult man.
Charge and Discharge Test
After looking at the appearance, let’s get to the point; below we will conduct charge and discharge tests at 0.2C, 0.5C and 1C rates.
Charging Test
The charging test will conduct constant current and constant voltage charging at 0.2C, 0.5C and 1C rates, and calculate the total time consumption.
0.2C charging
Draw a line chart and set the current to 6200mA and 0.2C to charge the Weilan New Energy 31Ah semi-solid battery. The charging cut-off voltage is 4.2V. The charging time to 4.2V is about 4 hours and 49 minutes. The trickle full charge time is about 5 Hours and 8 minutes.
0.5C charging
Draw a line chart, set the current to 15500mA, 0.5C to charge Welion New Energy 31Ah semi-solid battery, the charging cut-off voltage is 4.2V, the charging time to 4.2V is about 1 hour and 47 minutes, and the trickle full charge time is about 2 Hours 18 minutes.
1C charging
Draw a line chart, set the current to 31000mA, charge Welion New Energy 31Ah semi-solid battery at 1C, the charging cut-off voltage is 4.2V, the charging time to 4.2V is about 50 minutes, and the trickle full charge time is about 1 hour and 22 minutes.
The test data is drawn into a line chart. In the charging test, it took 5 hours and 8 minutes to fully charge at 0.2C, 2 hours and 19 minutes at 0.5C, and 1 hour and 22 minutes at 1C.
Discharge Test
During the discharge test phase, constant current discharge will be used, and the total time consumption, discharge capacity and energy values will be calculated.
0.2C discharge
Draw a line chart, set the current to 6200mA, 0.2C to discharge the Welion New Energy 31Ah semi-solid battery, the voltage equalization is 3.61V, and the cut-off voltage is 2.5V. It takes about 5 hours, the released capacity is 31046mAh, and the released energy is 111.92Wh.
0.5C discharge
Draw a line chart, set the current to 15500mA, 0.5C to discharge the Welion New Energy 31Ah semi-solid battery, the voltage equalization is 3.55V, and the cut-off voltage is 2.5V. It takes about 1 hour and 59 minutes, and the discharge capacity is 30832mAh, and the energy is released 109.56Wh.
1C discharge
Draw a line chart, set the current to 31000mA, 1C is the discharge of Welion New Energy 31Ah semi-solid battery, the voltage is equalized to 3.49V, and the cut-off voltage is 2.5V. It takes about 59 minutes, the released capacity is 30769mAh, and the released energy is 107.39Wh.
Summarizing the test data into a table, we can see the gap between the discharge tests of the battery cells at three rates. The shortest discharge time is 1C discharge, with a discharge time of about 59 minutes. The longest discharge time is 0.2C discharge, and the discharge time is about 5 hours.
The test data is summarized into a histogram. The overall discharge energy in the discharge test is between 107.39-111.92Wh; the highest discharge energy is the 0.2C discharge gear, and the discharge energy reaches 111.92Wh; the lowest discharge energy is the 1C discharge gear. The discharge energy is 107.39Wh.
Let's take a look at the difference in capacity released by each gear. Draw the data on a curve chart. You can see that the 0.2C discharge gear has a capacity of 31046mAh, and the lowest capacity is the 1C discharge gear, which has a capacity of 30769mAh.
Internal resistance test
For the internal resistance test part, the Battery Trading Network will use internal resistance testing instruments to test the fully charged internal resistance and empty charged internal resistance respectively.
Summarizing the test data into a table, you can see that the internal resistance voltage is 4.2V when fully charged and 2.5V when empty. The nominal internal resistance of the Welion New Energy 31Ah semi-solid battery is ≤1.8mΩ.
Drawing a histogram, you can see that the internal resistance of 4.2V full power is 1.73mΩ, and the internal resistance of 2.5V empty power is 2.12mΩ.
Temperature test
In the temperature test part, the Battery Trading Network will measure the temperature after 30 minutes at each charge and discharge rate.
Charging temperature test
0.2C charging
The Welion New Energy 31Ah semi-solid-state battery was charged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 25.8°C.
0.5C charging
The Welion New Energy 31Ah semi-solid-state battery was charged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 28.4°C.
1C charging
Welion New Energy 31Ah semi-solid-state battery was charged at 1C rate for 30 minutes, and the maximum surface temperature was about 39.9°C.
Discharge temperature test
0.2C discharge
Welion New Energy's 31Ah semi-solid-state battery was discharged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 26.9°C.
0.5C discharge
Welion New Energy's 31Ah semi-solid-state battery was discharged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 29.8°C.
1C discharge
Welion New Energy's 31Ah semi-solid-state battery was discharged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 36.5°C.
Summarize
Overall, in the charge and discharge test, the battery trading network conducted tests at three rates of 0.2C, 0.5C and 1C. In terms of charging, the 1C rate charging can complete charging in 1 hour and 22 minutes. In the discharge part, you can see The 0.2C rate discharge discharge capacity is 31046mAh, and the discharged energy reaches 111.92Wh, which is an excellent performance.
In terms of internal resistance, the internal resistance of 4.2V full power is 1.73mΩ, and the internal resistance of 2.5V empty power is 2.12mΩ. In terms of temperature, the temperature was tested after 30 minutes of charging and discharging at three different rates. The charging temperature was in the range of 25-40℃. The discharge temperature is in the range of 26-37°C. Thanks to the large volume and semi-solid technology, the maximum rate temperature is about the same as human body temperature, and the performance is excellent.
Semi-solid-state batteries not only achieve technological breakthroughs, but also demonstrate strong performance in practical applications, providing reliable energy solutions for high-power output application scenarios such as electric vehicles. With the continuous advancement of new energy technology, semi-solid battery technology will play a more important role in the future.
The length of 
