Chinese battery manufacturer CALB is overhauling its quality and safety processes following reports of swollen battery cells in GAC Aion vehicles. According to a report by Chinese media outlet Auto Time, the changes affect manufacturing, traceability, and the company’s quality management structure. The overhaul follows the “Banana Battery” controversy, which emerged in July.
According to the report, CALB is tightening manufacturing tolerances, expanding moisture monitoring during cell production, and improving the traceability of production batches. The company is also reviewing materials and formulations used in 2022 and 2023 and discontinuing formulations with lower safety margins.
Quality Department Gains More Authority
CALB is also introducing organizational changes. According to Auto Time, the company’s quality department will have the authority to block production batches that fail to meet internal standards. In addition, CALB has established a dedicated quality team for passenger vehicle customers that will analyze battery management system (BMS) data together with automakers.
Response to the “Banana Battery” Controversy
The measures follow issues involving 177-Ah lithium iron phosphate (LFP) battery cells used in GAC Aion S vehicles. After accumulating between 150,000 and 300,000 kilometers (93,000 to 186,000 miles), some vehicles reportedly experienced cell swelling, electrolyte leakage, and power loss. GAC Aion subsequently extended the battery warranty for affected vehicles to eight years or 300,000 kilometers (186,000 miles). CALB said it would assume responsibility for battery cell quality.
Source:
https://cnevpost.com/2026/08/06/calb-banana-battery-quality-overhaul/
