Question 1

High-voltage upon arrival

Accepted Answer

The ambient temperature is relatively high. As the temperature rises, the open-circuit voltage of LFP slightly increases; therefore, higher warehouse or transportation temperatures will make it appear even higher.

Question 2

Large voltage difference between individual strings in the module

Accepted Answer

Reason 1: Cell performance differences
Reason 2: Module assembly and connection process issues
Reason 3: Thermal non-uniformity
Reason 4: The pressure differential has increased due to the customer’s operating conditions
Reason 5: The data acquisition line is inaccurate

Question 3

Client testing process issues

Accepted Answer

Reason 1: The data acquisition line is inaccurate

Reason 2: A certain string of battery cells has completely failed or is short-circuited.

Reason 3: Severe over-discharge

Reason 4: Internal micro-short circuit leakage

Reason 5: BMS/sampling issue (appears to be low voltage)

Question 4

Low-capacity module aging

Accepted Answer

Reason 1: Low ambient temperuture
Reason 2: The charging and discharging procedures recommended by different companies show discrepancies
Reason 3: Large voltage difference among sorted and matched cells
Reason 4: Abnormal performance of individual battery cells
Reason 5: Module process technology issues

Question 5

High internal resistance of the battery cell

Accepted Answer

Reason 1: Different test frequencies. It’s common for factories to use AC internal resistance at 1 kHz, while customers typically measure DC internal resistance (DCR) or low-frequency resistance—values measured under different voltages can differ by 10% to 30%. As a result, customers may perceive the “internal resistance as high.

Reason 2: Inconsistent test voltage/SOC. The internal resistance of LFP varies depending on the SOC; refer to the reference table provided by the manufacturer for comparison.

Reason 3: Low temperature. When the ambient temperature is below 20℃, the internal resistance of LFP batteries will increase significantly. It's normal for the internal resistance to be high in winter or in cold warehouses.

Question 6

Excessive self-discharge

Accepted Answer

Reason 1: Overcharging and overdischarging. This damages the structure, triggers side reactions, and significantly increases self-discharge.

Reason 2: High-temperature storage/high-temperature transportation. Temperatures exceeding 45℃ will significantly accelerate side reactions, leading to faster pressure drop.

Reason 3: The battery was tested immediately after high-current fast charging without allowing it to rest. The voltage appeared artificially high but quickly dropped once the battery was allowed to sit, giving the impression of significant self-discharge.

FAQ

High-voltage upon arrival

Large voltage difference between individual strings in the module

Client testing process issues

Low-capacity module aging

High internal resistance of the battery cell

Excessive self-discharge

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