At the 2024 SMM 19th Lead-Zinc Conference and Lead-Zinc Technology Innovation Forum - Lead-Acid Battery Technology Forum hosted by SMM, Zhang Fengbo, senior engineer of Tianneng Group, introduced the relevant content of high-specific energy and long-life lead-acid power battery technology, and he also analyzed the battery market and introduced the development of lead-acid technology in detail.
Industry analysis
Industry Analysis: Battery Market Analysis
European 2030 battery plan: the transformation of the secondary power supply industry from 100 billion to trillion, of which battery is the key
In 2021, the global lead-acid scale will be about 350 billion, and it is expected that the scale will basically remain at 360 billion by 2025, of which the domestic market size is about 160 billion yuan. In recent years, although affected by new technologies such as lithium battery and sodium battery, the total amount of lead-acid batteries has maintained a slight increase due to safety restrictions.
Industry Analysis【Power Battery Market Analysis】
——In 2025, the total number of electric two-wheeled vehicles in China will be 360 million, and the market size will be about 70 billion yuan according to the lead-lithium ratio of 85:15.
New international transition period: The three-year transition period of the new national standard has arrived, and the government's digital governance has been vigorously promoted, but the call for revising the new national standard is rising.
Sodium-lithium technology impact: Indicators such as cycle life, energy density, and charging time of sodium-lithium batteries continue to improve, but safety will limit their growth.
Development of lead-acid technology
Development of Lead-acid Battery Technology [Secondary Power Supply Technology]
In the field of 3C digital, lithium-ion batteries are outstanding, and in the field of power tools, lithium-ion further competes for the nickel-cadmium battery market and forms an overwhelming advantage.
In the field of energy storage, the demand is growing rapidly, and the ratio of lead-acid and lithium batteries is 30:70;
In the car start-stop market, lead-acid batteries are still the main force, and lithium-ion accounts for no more than 2% dilution; in the field of electric bicycles, lead-acid hegemony is still there, and lithium-ion batteries compete for the main market, accounting for about 15% after dilution.
02 Development of Lead-acid Battery Technology [Research on High Specific Energy Battery Technology]
Battery Failure Analysis:
1. The active material of the cathode falls off
2. Creep of the negative grid
3. Corrosion of positive grids
4. The saturation of the battery pole group ~85%
Battery failure mode: The creep of the negative grid grows and the positive and negative plates are short-circuited
conclusion
Through the research of the cathode formulation of the power battery and the improvement of the low-temperature charging and receiving capacity of the negative electrode, a high-specific energy technology scheme for long-life batteries has been developed to comprehensively improve the battery performance:
1. The mass of 6-DZF-20 battery is reduced from 6.09 kg to 5.65 kg, the specific energy of the volume reaches 115Wh/l, the low-temperature discharge capacity of the battery is 0.78~0.83C2 at -18°C, and the low-temperature discharge capacity at -10°C is 0.86~0.89C2.
2. The high-energy 6-DZF-20 battery has 100% DoD cycle life, and the energy output capacity during the cycle process is further improved, and the mass specific energy can reach up to 46 Wh/kg @2hr.
3. The saturation of the pole group is ~85% after the cycle failure of the 6-DZF-20 battery, and the failure mode of the battery is positive grid corrosion.
4. The high energy density 6-DZF-20 battery has been tested in batches such as small-scale test and pilot test, and is fully equipped with the conditions to move from the "laboratory" to the "production workshop", which can further reduce the cost of lead-acid power battery.