We have a comprehensive quality management system, certified by ISO 9001 quality management system, and strictly implement international standardized production processes and quality control. From raw material procurement to finished product shipment, the entire process can be traced to ensure that every battery meets the entry requirements of the global market.
In terms of product quality and safety, our products have obtained multiple international authoritative certifications such as UL, CE, KC, UN38.3, MSDS, IEC 62133, IEC 62368, RoHS, DGM China, UKCA, CB, EN50604 etc. With this complete series of international certifications, our products have reached international advanced levels in safety, performance, environmental protection, and transportation, and can smoothly enter and serve major global markets such as North America, Europe, and Asia, providing reliable and compliant battery solutions for partners.
The first production line: Complete cell assembly, spot welding, protective plate welding, semi-finished product testing, and insulation protection to ensure "zero virtual welding and high insulation".
The second production line: Conduct shell installation, adhesive fixation, and aging testing to ensure that the lithium battery pack has "zero looseness and high stability".
The third production line: Conduct comprehensive testing and packaging of finished products for shipment, achieving "zero omissions and high quality".
Through high-temperature aging room and charge discharge cycle testing, the capacity, internal resistance, and self discharge stability of the lithium battery pack are screened to ensure that the lithium battery has "zero abnormalities and zero decay".
Store 18650/21700 battery cells strictly according to capacity and internal resistance zoning, and ensure "zero aging and zero accidents" of the cells through a constant temperature and humidity system and 24-hour smoke monitoring.
Stores battery packs that have passed aging testing, stacked by order batch and customer category to ensure traceable shipments and zero mixing errors.
Implement classified positioning, moisture-proof and dust-proof management for auxiliary materials such as BMS, nickel sheets, and wires, timely replenish through the inventory system, prevent wrong and mixed materials, and ensure efficient circulation of the production line.
Cell inspection is a 100% full inspection process performed on incoming raw materials before cells (18650 or 21700) are put into automated production lines for battery pack assembly. As a critical quality control gate, it uses high-precision equipment to test the actual capacity, voltage, internal resistance, and visual consistency of each cell, and eliminates defective units from incoming batches.
To ensure the consistency and safety of battery packs, we implement 100% full inspection rather than sampling inspection. The process is highly automated: After testing, cells with matching parameters are automatically sorted into separate bins for the next grouping process.
We apply strict dynamic selection standards, based not only on national standards but also our rigorous internal cell consistency criteria.
Domestic battery cells and imported brand battery cells Panasonic/Samsung/LG use the same standard:
• Voltage difference: ≤ 5mV among cells grouped in the same batch
• Internal resistance difference: ≤ 3mΩ among cells grouped in the same batch
• Appearance: No dents, scratches, rust, or electrolyte leakage
The principle of barrel effect: The overall performance of a battery pack is determined by its weakest cell. An unfiltered cell with high internal resistance can overheat rapidly, shortening cycle life or even causing thermal runaway. Ensure long cycle life: Only cells with consistent parameters can charge and discharge synchronously in series/parallel configurations to achieve designed service life. Inspection ensures battery packs maintain strong capacity retention after 3–5 years of use.
Marking & isolation: If a cell is identified as non-conforming (abnormal voltage, excessive internal resistance, poor appearance), the system automatically controls the robotic arm to reject it into a red reject bin. Physical segregation: All defective cells are recorded by dedicated personnel and stored in a separate Non-Conforming Product Area. Return to supplier: Defect rates are regularly analyzed, and 100% of non-conforming cells are returned to suppliers. No defective cells are allowed to enter production or reach the market.
BMS inspection is incoming quality verification for the Battery Management System (BMS). It ensures the BMS accurately monitors battery status (voltage, current, temperature) and reliably provides overcharge, over-discharge, overcurrent, short-circuit, and temperature protection. The BMS is the "safety brain" of the battery pack.
We use a professional BMS tester to simulate real battery operating conditions and verify overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection functions.
Overcharge protection accuracy: error ≤ ±25 mV
Over-discharge protection accuracy: error ≤ ±40 mV
Short-circuit protection response time: ≤ 300 μs
Temperature detection error: ≤ ±2 °C
Consistency: minimal dispersion of protection thresholds among the same batch
Eliminate safety hazards: prevent thermal runaway of 18650 / 21700 cells caused by overcharge.
Extend battery life: avoid premature cell aging due to over-discharge and poor balancing.
Reduce after-sales risks: ensure stable BMS performance under all operating conditions.
Marking & isolation: labeled with red non-conforming tags, moved to a dedicated non-conforming area, and strictly prohibited from entering production.
Return to supplier: returned to the supplier for full re-inspection, with analysis and corrective actions based on the test report.
Shell inspection is incoming quality control for battery pack enclosures.
It verifies dimensional accuracy, flame resistance rating, and sealing performance through standardized tests, ensuring tight, proper assembly and reliable fire-retardant protection.
Non-conforming units are immediately isolated and returned to suppliers or scrapped to prevent them from entering production.
Spot welding inspection verifies the firmness of the welding points through visual inspection and testing, and confirms that there are no abnormalities in electrical conductivity with the help of an internal resistance meter; Immediately isolate and repair or scrap products found to be welded improperly, ensuring that the appearance of the welded joint is qualified, the strength meets the standard, and there are no defects inside, thereby ensuring the reliability and safety of the connection.
Semi-finished product testing is a comprehensive verification of voltage, internal resistance, and BMS protection functions for battery packs after BMS installation.
A comprehensive battery tester is used for automatic inspection to ensure normal charging/discharging and proper triggering of BMS protection.
This step is a key barrier to prevent unqualified products from entering the assembly process, which can detect hidden dangers such as virtual welding and protection board failure in advance, and avoid risks.
Approved products: proceed to the next process
Non-conforming products: recorded and returned to the repair department for further analysis
● Finished product aging test places assembled battery packs into an aging cabinet to simulate real working conditions via constant-temperature charge–discharge cycles, verifying pack capacity, internal resistance, and BMS stability.
● Using a constant-temperature aging cabinet with high-precision charge–discharge equipment, the battery packs undergo multiple charge–discharge cycles, with real-time monitoring of voltage, temperature, and capacity data to ensure no abnormal fluctuations.
● Approved products: proceed to the next process
● Non-conforming products: recorded and returned to the repair department for further analysis
Final testing verifies overcharge, over-discharge, short-circuit, overcurrent, and charge-discharge protection functions, confirming the overall performance, safety, and environmental adaptability of the finished battery pack.
Passed: proceed to packaging
Failed: recorded and returned to the repair department for further analysis
Spot welding is the process of using a high-precision automatic spot welding machine to instantly release a large current, causing the nickel sheet to melt and bond with the contact surface of the positive and negative poles of the battery cell, forming a strong and low resistance electrical connection.
The quality of spot welding directly determines the connection reliability and internal resistance consistency of the battery pack, and is a key process to ensure stable high current discharge and long-term cycle life.
After welding is completed, 100% visual inspection and sampling testing are conducted. Any non-conforming products found to have virtual welding, over welding, or nickel sheet damage are immediately isolated and removed by professional maintenance personnel for re welding. If they cannot be repaired, they are scrapped.
BMS assembly is the precise connection of BMS protection boards to battery cell groups through laser welding or ultrasonic welding processes, enabling the battery cell groups to have intelligent protection functions such as overcharging, overdischarging, and overcurrent.
Welding quality directly determines the accuracy of signal sampling by the protection board, serving as a core safeguard against battery fire risks and extended service life.
If virtual soldering or polarity errors are found, they should be immediately isolated. BMS or battery cell groups that cannot be repaired should be scrapped and never flow into the next process.
