US 12,469,890 B2
Electrochemical device, charging device, charging method, system and electronic device
Xiaolong Dong, Fujian (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN)
Filed on Mar. 31, 2022, as Appl. No. 17/710,212.
Application 17/710,212 is a continuation of application No. PCT/CN2021/103869, filed on Jun. 30, 2021.
Prior Publication US 2023/0006270 A1, Jan. 5, 2023
Int. Cl. H01M 10/44 (2006.01); H01M 50/54 (2021.01)
CPC H01M 10/44 (2013.01) [H01M 50/54 (2021.01)] 13 Claims
OG exemplary drawing
 
1. An electrochemical device, comprising:
a negative electrode plate, a positive electrode plate, a separator, m negative tabs and n positive tabs;
the separator is provided between the negative electrode plate and the positive electrode plate;
the m negative tabs are electrically connected to the negative electrode plate;
m is a positive integer greater than or equal to 1;
the n positive tabs are electrically connected to the positive electrode plate;
n is a positive integer greater than 1;
n>m; and
the electrochemical device is configured to be charged with a multi-stage constant current charging method;
wherein,
the electrochemical device is configured to be
charged with a first charging current I1 until a voltage of the electrochemical device reaches a first voltage U1;
charged with a second charging current I2 until the voltage of the electrochemical device reaches a second voltage U2;
I2<I1;
U2>U1;
charged with the second voltage U2 until a current of the electrochemical device reaches a charging cut-off current I0;
wherein,
a charging voltage limit of the electrochemical device is U0; and

OG Complex Work Unit Math