How Online Temperature and Pressure Compensation Improve Electrolyte Filling for Large-Format Lithium-Ion Cells
4 min readThe lithium-ion battery and energy storage industry is expanding rapidly.
According to GGII statistics, China's total lithium-ion battery shipment reached 1.2 TWh in the first half of 2026, representing year-on-year growth of over 50%.
The energy storage segment delivered particularly strong growth, with shipments reaching 485 GWh and year-on-year growth exceeding 80%.
Driven by rising market demand, energy storage manufacturers have maintained high capacity utilization for extended periods. Top-tier players register utilization rates of 92%–98%, while second-tier manufacturers remain steadily at 90%–95%. At the same time, the industry is facing a prominent short-term supply shortage.
Large-Format Cell Production: New Filling Challenges
Alongside large-scale capacity expansion, cell formats are also being upgraded.
The previously common 300 Ah cells are gradually being phased out, while ultra-large-capacity cells of 500 Ah, 600 Ah, and 790 Ah are becoming increasingly common on newly built production lines.
As electrolyte filling volumes increase, filling accuracy and process stability become increasingly important. This also places higher requirements on filling equipment used in large-format cell mass production.
Online Temperature and Pressure Compensation for Large-Format Cell Filling
To meet the demand for production line upgrades, Guangzhou Ascend has launched the FSH-CF200 / CF500 high-capacity constant-current filling pumps.
As new members of the CF series, these pumps provide higher flow rates and improved mass production efficiency compared with the CF150 series. They are factory-fitted with two core hardware components: an online real-time temperature compensation module and an online real-time pressure-detecting sensor.
Together with a dedicated dual closed-loop intelligent temperature-pressure control system, these features help reduce process fluctuations caused by temperature and pressure changes, supporting high-speed and high-precision electrolyte filling for ultra-large-capacity energy storage cells and power batteries.
Online Real-Time Temperature Compensation: Reducing Filling Drift Caused by Temperature Changes
Electrolyte filling accuracy directly affects battery cycle life, batch consistency, and production yield. During large-format cell manufacturing, measurement deviations caused by temperature and pipeline pressure can become important process challenges.
With the significantly increased electrolyte filling volume of large-format cells, electrolyte density becomes particularly sensitive to temperature. Even relatively small temperature variations can result in noticeable filling volume deviations.
The online real-time temperature compensation module dynamically monitors temperature changes and provides corresponding correction, helping reduce filling drift caused by temperature variation and maintain more consistent filling accuracy during mass production.
Online Real-Time Pressure Detection: Monitoring and Compensating for Pressure Fluctuations
Fluid control is another challenge during high-flow, high-speed electrolyte filling. Pipeline bending, multi-pump parallel shunting, slight pipe-wall clogging, and frequent equipment start-stop operations can all cause pipeline pressure fluctuations.
Excessively high pressure may lead to electrolyte leakage, cell contamination, and damage to valves and sealing components, increasing operation and maintenance costs. Insufficient pressure can result in uneven electrolyte infiltration and potentially affect battery cycle life.
The CF200 / CF500 series is equipped with an online real-time pressure-detecting sensor that provides three key functions: real-time pressure monitoring, abnormal-condition early-warning shutdown, and intelligent static-pressure compensation.
During operation, the equipment continuously monitors pipeline pressure. If the pressure exceeds the preset threshold, it can trigger an alarm and immediate shutdown to help prevent liquid leakage, cell contamination, and component damage.
After shutdown, the system can also capture static pressure values, calculate residual pressure deviations, and automatically compensate for these deviations during the next filling cycle. This helps reduce filling deviations associated with pressure fluctuations during equipment startup and shutdown and supports improved production yield.
In addition, full-process pressure data can be recorded for fault tracing and maintenance, helping improve production line uptime.
Key Advantages of the CF200 / CF500 Series for Large-Format Cell Production
1. High-Flow Filling for Improved Production Efficiency
The CF200 / CF500 series supports high-flow output of 200–300 g/s and 500 g/s. When matched with dedicated DN10 / DN20 valves, it provides a substantial performance improvement compared with the CF150 series.
A single pump can complete full-volume electrolyte filling for high-capacity cells in one pass, helping optimize production line tact time and support large-scale production of energy storage and large-format power batteries.
2. Standard Temperature and Pressure Sensors for Easier Integration
The two core sensors for temperature and pressure are supplied as standard. Additional peripherals or secondary modifications are not required.
With its compact structure, the unit can fit into limited installation spaces on automated production lines, supporting easier integration and deployment.
3. Pulse-Free Liquid Delivery for Consistent Filling
The system provides pulse-free, smooth high-flow liquid delivery. Combined with the temperature-pressure dual closed-loop control system, it supports high-speed filling while helping improve battery batch consistency.
Supporting the Upgrade of Large-Format Cell Filling Processes
As lithium-ion battery manufacturers move toward 500 Ah, 600 Ah, 790 Ah, and other high-capacity cells, electrolyte filling equipment needs to accommodate larger filling volumes while maintaining accuracy and process stability.
The FSH-CF200 / CF500 series from Guangzhou Ascend addresses these requirements with higher-flow filling, online real-time temperature compensation, online real-time pressure detection, and dual closed-loop temperature-pressure control.
For manufacturers upgrading large-format energy storage and power battery production lines, these features provide a practical approach to improving electrolyte filling efficiency, stability, and production consistency.
https://www.ascendtechs.com/empowered-by-new-technologies.html
Guangzhou Ascend Precision Machinery Co.,Ltd.
About Author
