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Capacity grading activation method of lithium ion battery

A lithium-ion battery, activation method technology, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc., can solve the problem of low capacity in the first week, improve lithium diffusion performance, and improve the first week of testing. The effect of capacity

Pending Publication Date: 2022-04-01
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
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Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low capacity in the first week of testing of existing lithium-ion batteries, and then provide a method for activating lithium-ion batteries by volume

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  • Capacity grading activation method of lithium ion battery
  • Capacity grading activation method of lithium ion battery
  • Capacity grading activation method of lithium ion battery

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Embodiment Construction

[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention provides a capacity grading activation method of a lithium ion battery. The capacity grading activation method of the lithium ion battery comprises the following steps: charging the lithium ion battery to a charging cut-off voltage at a preset charging rate, and then performing constant-voltage charging on the lithium ion battery to a charging cut-off current at the charging cut-off voltage; discharging the lithium ion battery to a first voltage at a first preset discharge rate; the lithium ion battery is discharged to a third voltage at a second preset discharge rate, the third voltage is smaller than the discharge cut-off voltage of the lithium ion battery, and the second preset discharge rate is smaller than the first preset discharge rate. According to the capacity grading activation method disclosed by the invention, the positive electrode active material can realize sufficient lithium removal and lithium insertion processes, and the lithium diffusion performance is improved by adjusting defects, so that the test first-cycle capacity of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a volume-divided activation method for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy and small specific volume. After continuous improvement and development, lithium-ion batteries with the characteristics of long life, high safety, large capacity, and low cost have been widely used in the field of vehicle-mounted and portable mobile power supplies. However, after the production of lithium-ion batteries, there is a problem of low capacity in the first week of testing. This is generally due to the abnormally low capacity in the first week of battery cell testing caused by abnormal raw materials, manufacturing processes or testing, such as poor infiltration of pole pieces, formation, aging and distribution. Variations in temperature conditions, etc. In addition, there are some situations where t...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/0525
CPCY02E60/10
Inventor 郑浩森魏臻芦诗才徐中领
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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