Application of Xindashida Inverters in the Water Supply System for Negative Electrode Production in the Lithium Battery Industry
2025-08-22
Application of Xindashida Inverters in the Water Supply System for Negative Electrode Production in the Lithium Battery Industry
Project Background
Benefiting from the growth in domestic and international end markets, such as new-energy vehicles, China’s lithium-battery-related industries have been developing rapidly, leading to increased market demand for negative-electrode materials. According to the “2025-2030 China Lithium-Battery Negative-Electrode Materials Industry Market In-depth Analysis and Development Trend Forecast Report” released by the China Business Industry Research Institute, China’s shipments of negative-electrode materials in the first half of 2025 reached 1.29 million tons, representing a year-on-year increase of 37%.
Customer needs
A certain company’s business scope covers the entire midstream segment of battery anode materials. In the first half of 2025, Chinese companies’ production of anode materials accounted for 21% of the total shipments in the anode industry (data source: SMM and China Business Industry Research Institute). As the company continues to expand its production capacity, it needs to further reduce costs and improve efficiency to enhance its market competitiveness.
Industry share of negative electrode shipments for the first half of 2025 by a certain company
In the critical stages of the negative electrode material production line, the water supply system is like an “invisible heart”—an intelligent water supply system that is energy-efficient, highly effective, and operates with remarkable stability. Such a system not only meets the fundamental requirements for production but also represents a strategic choice for enterprises seeking to enhance their market competitiveness.
The company’s current water supply system is facing three core pain points:
Poor stability
Pressure fluctuations directly affect production stability, causing critical process parameters to deviate from their set ranges and leading to forced reductions in equipment operating speed or even abnormal shutdowns.
Wasted electrical energy
Traditional power-frequency water pumps operate in a crude, "full-speed" mode, maintaining full-load operation even during periods of low water demand. As a result, these pumps run for as many as 8,000 hours per year, leading to significant energy waste.
High maintenance costs
The system has been operating for a long time under non-optimal conditions, with frequent start-stop cycles and impact loads, leading to accelerated equipment wear and a rising failure rate. This not only increases maintenance costs but also compromises production reliability.
Xinshida Solution
The Xinshida drive and control system employs a high-voltage variable-frequency drive together with two high-voltage solid-state soft starters to simultaneously control the operation of three high-voltage water pumps. The system primarily consists of a high-voltage variable-frequency drive, a constant-pressure water supply controller, pressure sensors, pump units, and associated electrical control cabinets. The pressure sensors are installed at the end of the plant’s water supply equipment, continuously collecting real-time pressure signals from the pipeline network and converting them into electrical signals that are transmitted to the constant-pressure water supply controller.
As shown in the figure above, the entire water supply system can seamlessly switch between “single-pump frequency conversion” and “multi-pump interlock operation,” featuring clear logic and reliable performance. At the start of operation, Pump #1—equipped with frequency conversion—starts up first, and its PID closed-loop control precisely maintains the network pressure at 1 MPa. If water demand suddenly increases and the pressure drops to 0.9 MPa and remains below that level for 30 seconds, the system immediately soft-starts Pump #2. Once Pump #2 is synchronized into the grid, it switches to mains frequency operation, while Pump #1—now operating in frequency conversion mode—automatically reduces its speed to 30 Hz and enters standby mode, ensuring both adequate water supply and prevention of overpressure. Should the pressure still fall short, the system will continue to softly start Pump #3, transitioning to a combined output mode of “1 frequency-conversion pump + 2 mains-frequency pumps” to deliver maximum capacity and stabilize water pressure. Conversely, when the pressure rises above 1.5 MPa, the system sequentially shuts down the pumps in the order of “first stopping Pump #3, then stopping Pump #2,” leaving only Pump #1—operating in frequency conversion mode—to smoothly increase its speed and maintain constant network pressure, thereby achieving efficient, low-energy consumption, and long-lasting operation.
• Precise control, remote management
The Xindashida AS800 universal high-voltage frequency converter boasts powerful overload capacity and precise speed control accuracy, enabling it to meet the stable operational requirements of water pumps under various operating conditions. It supports multiple communication protocols, making it easy to integrate with the plant’s monitoring system for remote monitoring and management.
• Insulation Protection: Elevating Safety to a New Level
The phase-shifting transformer used for rectification in the variable-frequency drive should be a dry-type transformer with a closed enclosure and insulation class H. The variable-frequency drive complies with and exceeds the strictest requirements for voltage distortion and current distortion specified in IEEE 519-1992 and GB/T 14519-93 standards.
• Stable operation, compatible and adaptable
10kV unit-series, 48-pulse SPWM cascaded waveform output; power factor ≥0.95 over a 20–100% load range—no compensation or filtering required for direct drive of standard induction motors; torque ripple <0.1%; and equipped with resonance frequency hopping capability.
Associated products
AS800 High-Voltage Frequency Converter
Project Results
• Significantly improved water pressure stability
The fluctuation range of water pressure in the plant’s pipeline network is controlled within ±0.05 MPa, fully meeting the plant’s stringent requirements for water pressure stability.
• Annual power consumption reduced by 20–30%
The pump motor can adjust its speed in real time according to the actual water demand. Based on statistical analysis of actual operational data, the renovated water supply system has reduced its annual power consumption by 20% to 30% compared to the pre-renovation system, saving millions of yuan in electricity costs each year.
• Maintenance costs reduced by more than 50%
After the renovation, the average number of water supply system failures per month has been reduced to less than one, and the repair time for each failure has been shortened to within two hours. Equipment maintenance costs have decreased by more than 50%, and the number of water outages at the plant has been significantly reduced.
High-voltage soft starter & unit cabinet & control cabinet
Transformer Cabinet & Bypass Cabinet
