US 11,888,116 B2
Fast charge long-lifetime secondary battery, battery module, battery pack, and power consumption device
Peipei Chen, Ningde (CN); Chang Peng, Ningde (CN); and Hailin Zou, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Sep. 8, 2022, as Appl. No. 17/930,420.
Application 17/930,420 is a continuation of application No. PCT/CN2021/119110, filed on Sep. 17, 2021.
Prior Publication US 2023/0091618 A1, Mar. 23, 2023
Int. Cl. H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 50/534 (2021.01); H01M 10/0568 (2010.01)
CPC H01M 10/0567 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 50/534 (2021.01); H01M 2220/20 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A secondary battery, comprising an electrode assembly and an electrolytic solution, the electrode assembly comprising a positive electrode plate, a negative electrode plate, and a separator, the positive electrode plate comprising a positive electrode tab, and the negative electrode plate comprising a negative electrode tab, wherein the positive electrode tab has a following temperature rise coefficient α A.h/mm:

OG Complex Work Unit Math
where S1 is a total cross-sectional area of the positive electrode tab, in unit of mm2; C is capacity of the electrode assembly, in unit of Ah, wherein α is from 2 to 9.5;
the electrolytic solution contains a heat stable salt and an additive that inhibits decomposition of lithium salt, wherein
the heat stable salt has a following molecular formula:
(My+)x/yR1(SO2N)xSO2R2,
wherein
My+ is one or more selected from the group consisting of Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Fe2+, Fe3+, Ni2+, and Ni3+, optionally, My+ is one or more selected from the group consisting of Li+, K+, Cs+, and Ba2+, and y is valence of the M,
the R1 and R2 are each independently selected from the group consisting of fluorine atom, fluoroalkyl having 1˜20 carbon atoms, fluoroalkoxy having 1˜20 carbon atoms, and alkyl having 1˜20 carbon atoms,
x is an integer selected from the group consisting of 1, 2, and 3,
by mass percentage, a content of the heat stable salt in the electrolytic solution is w %, wherein w % is from 8% to 30%,
the additive that inhibits decomposition of lithium salt is one or more of RSO3F, where R is one or more selected from the group consisting of Li+, Na+, K+, Rb+, and Cs+,
by mass percentage, a content of the additive that inhibits decomposition of lithium salt in the electrolytic solution is m1%, wherein m1% is from 0.1% to 5%, and
w, m1, and α satisfy 0.5<m1w/α<20.