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On January 17th, the sunshine was just right, and the Shenzhen Hongda New Energy Co., Ltd. Football Association Tournament kicked off warmly on the green field! Players from various departments of the company form a team, making friends with the club and wri...

The essence of lithium battery aging is a performance degradation process of the chemical system under cyclic charging/discharging or high-temperature environments, involving electrode material structure damage, electrolyte decomposition, SEI film thickening...

In the Era of New Energy: Battery Testing as the Key to Performance and Safety In the age of new energy, batteries are not just power sources; they are the foundation of safety and efficiency. Charge-discharge testing is the critical technology that unlocks...

In the battery industry, cells are classified into A-grade and B-grade based on production standards, performance parameters, and quality control. These two grades differ significantly in performance stability, consistency, safety, and application scenarios. B...

As the two core technical routes in the energy storage sector, lithium iron phosphate (LFP) and ternary lithium (NCM/NCA) have distinct performance characteristics that directly dictate their suitability for different energy storage scenarios. Lithium iron pho...

The straightforward answer is no​ – even when equipped with a BMS (Battery Management System), a lithium battery cannot achieve absolute 100% safety.

 Acting as the "intelligent brain" and "safety guard" of a lithium battery, the BMS is the core system ensuring its safe operation. It can instantly cut off the charging circuit when the cell voltage approaches the upper limit of 4.2V, preventing lithium plating and potential thermal runaway. It also stops discharge when the voltage drops below the lower limit of 2.5V to avoid irreversible damage. Furthermore, the BMS detects abnormal high currents and interrupts the circuit within milliseconds to mitigate short-circuit risks. When the temperature deviates from the safe operating range (typically 15-35°C), it limits power output or activates thermal management systems. Additionally, through cell balancing, the BMS ensures voltage consistency among individual cells in a pack, eliminating the root cause of local overcharging or over-discharging.

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.

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:

1. 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.
2. 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).

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.