US 12,222,403 B2
Battery device, detection method thereof, and screening method and device of battery unit
Ruijun Ma, Changzhou (CN); Shihui Zhang, Changzhou (CN); Zhipeng Liu, Changzhou (CN); and Qiru Li, Changzhou (CN)
Assigned to CALB Co., Ltd., Jiangsu (CN)
Filed by CALB Co., Ltd., Jiangsu (CN)
Filed on Jul. 1, 2022, as Appl. No. 17/855,810.
Claims priority of application No. 202210515569.6 (CN), filed on May 12, 2022.
Prior Publication US 2023/0366949 A1, Nov. 16, 2023
Int. Cl. G01R 31/396 (2019.01); G01R 31/36 (2020.01)
CPC G01R 31/396 (2019.01) [G01R 31/3646 (2019.01); G01R 31/3648 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A battery device, comprising at least two battery units, wherein a difference between characteristic values of any one of the at least two battery units is controlled within a preset range,
wherein the preset range is 0.5% to 40%,
wherein each one of the characteristic values is obtained by adopting a following test:
when any one of the at least two the battery units is discharged at a discharge rate of 0.05 Capacity (C) and a discharge rate of 1C respectively in a discharge voltage interval of 2.8 Volt (V) to 4.2V, obtaining two discharge differential voltage analysis (DVA) curves, and determining a difference between minimum values of the two discharge DVA curves to be as a characteristic value of one of the at least two battery units.