Method for charging a lithium ion battery

Patent metadata

Field	Value
Publication number	US-10164456-B2
Application number	US-201715439867-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Feb 23, 2016
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A method for charging a lithium ion battery includes the steps of: 1) determining a maximum charging current I 0 and a lowest anode potential η of the lithium ion battery at which no lithium precipitation occurs; 2) charging the lithium ion battery at a constant current of I 1 which is greater than I 0 for a charging time t 1 ; 3) discharging the lithium ion battery at a constant current of I 2 which is less than I 0 for a discharging time t 2 , 5≤t 1 /t 2 ≤50; 4) repeating steps 2) and 3) until a cutoff voltage of the lithium ion battery reaches V 0 and standing the lithium ion battery for a standing time t 3 ; and 5) charging the lithium ion battery at a constant current of I 0 until the cutoff voltage of the lithium ion battery reaches V 0 and charging the lithium ion battery to a cutoff current of I 3 at a constant voltage.

First claim

What is claimed is:

1. A method for charging a lithium ion battery, comprising the steps of:
1) determining a maximum charging current I 0 and a lowest anode potential η of the lithium ion battery at which no lithium precipitation occurs;
2) charging the lithium ion battery at a constant current of I 1 which is greater than I 0 for a charging time of t 1 ;
3) discharging the lithium ion battery at a constant current of I 2 which is less than I 0 for a discharging time of t 2 , wherein 5≤t 1 /t 2 ≤50;
4) repeating steps 2) and 3) until a cutoff voltage of the lithium ion battery reaches V 0 , and then standing the lithium ion battery for a standing time of t 3 ; and
5) charging the lithium ion battery with a constant current of I 0 until the cutoff voltage of the lithium ion battery reaches V 0 and then charging the lithium ion battery to a cutoff current of I 3 at a constant voltage.

2. The method for charging a lithium ion battery of claim 1 , wherein in step 2), a current value of the constant current I 1 is 0.7 C to 3 C and the charging time t 1 is 0.1 s to 20 s.

3. The method for charging a lithium ion battery of claim 1 , wherein in step 3), a current value of the constant current I 2 is 0 to 0.2 C and the discharging time t 2 is 0.01 s to 2 s.

4. The method for charging a lithium ion battery of claim 1 , wherein in step 4), the standing time t 3 is 1 s to 10 s.

5. The method for charging a lithium ion battery of claim 1 , wherein in step 5), a current value of the constant current I 3 is 0.01 C to 0.1 C.

6. The method for charging a lithium ion battery of claim 1 , wherein the cutoff voltage V 0 satisfies 3.6V≤V 0 ≤4.5V.

7. The method for charging a lithium ion battery of claim 1 , wherein a cathode of the lithium ion battery is selected from a group consisting of LiCoO 2 , LiFePO 4 , LiNiCoMn x Al 1-x O 2 , wherein 0≤x≤1; an anode of the lithium ion battery is selected from a group consisting of graphite, hard carbon, mesophase carbon microbeads; a maximum charge current I 0 of the anode at which no lithium precipitation occurs at the anode is 0.5 C to 2.0 C; and a lowest anode potential η at which no lithium precipitation occurs at the anode is −5 mV to −100 mV.

8. The method for charging a lithium ion battery of claim 1 , wherein the method is carried out at a temperature of 25±3° C.

Assignees

• Dongguan Amperex Tech Ltd
• Ningde Amperex Technology Ltd

Inventors

• Luo Fuping
• Wang Shengwei
• Gao Chao
• Zheng Qiang

Classifications

• H02J7/96

  in response to battery voltage · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/44 Primary

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title