In-depth analysis of dry-charged battery technology

How does a Dry-charged battery work?

Dry-charged automotive batteries belong to the lead-acid battery system. During discharge, the lead dioxide (PbO₂) on the positive electrode and the spongy lead (Pb) on the negative electrode undergo an electrochemical reaction in the electrolyte (dilute sulfuric acid H₂SO₄), converting chemical energy into electrical energy. During charging, under the action of an external power source, the lead sulfate (PbSO₄) on the electrodes is reduced to pure lead and lead dioxide, converting electrical energy into chemical energy for storage.

Dry-charged Battery Core Technology Process Analysis:

 High-Activity Lead Paste Formula and Tetrabasic Lead Sulfate (4BS) Curing Process

The core of dry-charged batteries lies in preventing the plates from oxidizing in the absence of electrolyte. We employ industry-leading 4BS curing technology, resulting in a coarser and more uniform crystal structure on the plates, significantly enhancing their mechanical strength and vibration resistance, thereby extending the overall battery life.

Special Anti-Oxidation Coating Technology for Negative Electrode Plates

To ensure that the negative electrode active material (sponge-like lead) is not oxidized by oxygen in the air during long-term storage, a special antioxidant impregnation process is applied to the plate surface. This technology guarantees that even after storage for 12-24 months, it can still instantly release over 95% of the rated starting current (CCA) after electrolyte injection.

Composite porous high-quality separator (AGM/PE): 

Utilizing low internal resistance and high porosity PE or AGM separators, this effectively prevents electrode embrittlement and short circuits in a dry state. Simultaneously, it allows for rapid electrolyte penetration after acid filling, ensuring the battery possesses excellent high-rate discharge capability.

Key Points for Daily Maintenance of Dry-Charged Batteries – Practical Tips for Extending Life

1. Maintain Electrolyte Level:Regularly check the electrolyte level during use. If the level is too low, add distilled water (never add sulfuric acid directly) to maintain the level at the standard height (generally 10-15 mm above the plates).
2. Recharge Judgment:Check the electrolyte density – if the density drops below 1.24, or the measured terminal voltage is below 1.7V, immediately recharge to prevent plate sulfation and damage.
3. Constant Current Charging Specification:Use the constant current charging method. The charging current should ideally be 1/10 of the battery’s rated capacity (e.g., a 60Ah battery should be charged at 6A). A fully charged battery is indicated when the electrolyte density no longer rises within two hours and the voltage of each cell reaches approximately 1.65V.
4. Long-Term Storage Maintenance:If the vehicle will not be used for an extended period (1-2 months), fully charge the battery and adjust the electrolyte density to the specified value. During storage, check the electrolyte density at least monthly and recharge if necessary. For storage exceeding six months, use the “dry storage method.”
5. Keep the Casing Clean:Regularly flush away any overflowing electrolyte to keep the casing clean. Apply a layer of petroleum jelly or grease to the terminals to prevent corrosion and rust.
6. Avoid Using Metal to Remove Debris:If debris falls into the battery, do not use iron or copper wire to hook it out. Use a dry wooden stick to remove it. Metal molecules can enter the electrolyte under the corrosive effects of sulfuric acid, causing self-discharge and damaging the plates.