Industry News
Why Do Lithium Batteries (Cells) Swell? Can Swollen Batteries Still Be Used?
The core reason for lithium battery swelling (also known as expansion) is the accumulation of gas inside the cell. This phenomenon stems from several key causes, each directly linked to damage within the battery's internal structure.
Why Does the Voltage of a LiFePO4 Battery Drop After Disconnecting the Charger?
When a Lithium Iron Phosphate (LiFePO4) battery is fully charged and disconnected from the charger, its voltage naturally decreases from the charging cutoff voltage (approx. 3.65V) to a stable resting value (approx. 3.4V). This is a normal phenomenon, not a sign of battery failure. The primary reason for this voltage drop is the dissipation of polarization effects. During charging, two main types of polarization occur inside the battery:
- Electrochemical Polarization: The chemical reaction rate at the electrodes can't keep up with the fast flow of electrons, causing charge to build up at the electrode interfaces and creating an additional voltage difference.
- Concentration Polarization: A concentration gradient of lithium ions (Li⁺) forms, especially near the negative electrode surface where Li⁺ concentration becomes high during charging. Once charging stops, these polarization effects quickly fade. Lithium ions diffuse from high-concentration areas to low-concentration areas, causing the voltage to relax back towards the stable Open-Circuit Voltage (OCV).
Hongda Empowerment: Escort the cultivation of battery professionals with high-precision testing equipment
Recently, the 2025 "Haihe Craftsman Cup" Skills Competition - the first battery and battery system maintenance personnel competition - was successfully held, marking a new stage of standardization and specialization in the training of skilled talents in China's new energy field. As the supplier of battery testing equipment for this competition, Shenzhen Hongda New Energy Co., Ltd. has provided solid guarantees for the smooth holding of the event with its independently developed high-precision testing equipment, stable system support, and comprehensive technical services, winning unanimous praise from the organizers, judges, and participants.
Powering Progress in the Horn of Africa: Shenzhen Hongda New Energy's Advanced Battery Testing System Shipped to Ethiopia
The National Battery Professional Competition kicked off in Tianjin, and our battery testing equipment helped to boost the competition
On December 8th, the First National Battery Industry Vocational Competition, hosted by the China Battery Industry Association, was grandly held in Tianjin. This competition brought together elites from the battery industry across the country to compete for the highest honors in the field of battery technology. At this grand event, the portable battery testing equipment of Shenzhen Hongda New Energy Co., Ltd. stood out with its excellent performance and became a major highlight at the competition site!