US 11,901,555 B2
Battery module, battery pack, and electric apparatus
Quanguo Li, Ningde (CN); Yonghuang Ye, Ningde (CN); Chengdu Liang, Ningde (CN); Haizu Jin, Ningde (CN); Qian Liu, Ningde (CN); Fajun Huang, Ningde (CN); and Xiaofu Xu, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Jan. 4, 2023, as Appl. No. 18/149,672.
Application 18/149,672 is a continuation of application No. PCT/CN2021/109686, filed on Jul. 30, 2021.
Prior Publication US 2023/0163296 A1, May 25, 2023
Int. Cl. H01M 4/525 (2010.01); H01M 10/615 (2014.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 10/654 (2014.01); H01M 50/204 (2021.01); H01M 50/233 (2021.01); H01M 50/267 (2021.01); H01M 10/617 (2014.01)
CPC H01M 4/525 (2013.01) [H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 10/615 (2015.04); H01M 10/617 (2015.04); H01M 10/654 (2015.04); H01M 50/204 (2021.01); H01M 50/233 (2021.01); H01M 50/267 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A battery module, comprising a first type of cell and a second type of cell that are cells of different chemical systems, wherein
the first type of cell comprises n first cells, the second type of cell comprises m second cells, wherein n and m each are selected from an integer greater than 1, at least one of the first cells and at least one of the second cells are electrically connected in series, and the first cell and the second cell satisfy at least conditions (1) to (3):
0.08≤ΔRB/ΔRA≤3.50;  condition (1):
0.10 mΩ/100 cycles≤ΔRA≤0.40 mΩ/100 cycles; and  condition (2):
IMPB<IMPA; and,  condition (3):
wherein ΔRA is a discharge resistance growth rate of the first cell,
ΔRB is a discharge resistance growth rate of the second cell,
IMPA is an alternating current impedance of the first cell; and
IMPB is an alternating current impedance of the second cell,
wherein the discharge resistance growth rate is measured by a difference between a discharge resistance (R) of a cell in an initial state and a discharge resistance of the cell after 100 cycles of charging/discharging, wherein the discharge resistance of the cell is calculated using formula R=(V1−V2)/I, wherein I is a constant discharge current, V1 is an initial voltage of the cell, V2 is an end voltage of the cell after discharging at I for a specified period of time, and ΔRB/ΔRA are measured under the same condition, and
wherein the alternating current impedance is measured using a test signal with a frequency of 1000 Hz, and IMPA and IMPB are measured under the same condition.