BQ4050: RSOC jumps during 0.5C 1.0 discharge accuracy verification

Problem Description:

1. When the 0.5C 1.0C discharge accuracy is verified, there is a jump, and there is no jump at 0.2C, based on the normal temperature test.

0.5C discharge accuracy deviation 0%~﹢18% RSOC jump amplitude 15%.

1.0C discharge accuracy deviation 0%~﹢44% RSOC jump amplitude 39%.

Remarks: Polymer batteries, 3S4P combination, full charge voltage is 4.35V, step-down 4.2V is used.

2. Are the following three parameter settings reasonable?

Fixed EDV 0 –>3200mV

Voltage 100% DOD–>3401mV

OCV11 DOC 0%–>3409mV

3. Would lowering the EDV2 voltage and increasing the EDV2 delay fix the problem?

4. Is there any other way to optimize this jump?

Attach GG file

ICA055GA-4050-0-01-HZ-1bei-1mR-R00-2022-7-27-A1.gg.csv

Star Xu：

您好，使用fix EDV 在不同放电率和温度下会出现RSOC跳变现象，建议您用CEDV，CEDV 算法会对 EDV 对应的电压进行补偿。根据负载和温度等条件对 7% 的电压点 EDV2 进行修正，以便在准确的 7%点更新 FCC，提高 FCC 和 SOC 精度。