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A kind of capacity dividing method of lithium ion battery

A lithium-ion battery and capacity-division technology, which is applied in secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve problems such as increasing energy consumption, increasing battery production cycle, etc., to improve battery performance , the effect of increasing battery capacity and capacity consistency

Active Publication Date: 2022-06-07
BAILE ELECTROTHERMIC ELECTRIC APPLIANCE JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple charge and discharge cycles in the capacity division stage will greatly increase the production cycle of the battery and increase energy consumption. Therefore, it is necessary to shorten the time-consuming process of capacity division on the basis of satisfying the electrochemical performance of the battery.

Method used

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  • A kind of capacity dividing method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] For the formed and sealed batteries, carry out capacity separation at room temperature. The specific steps are:

[0014] (1) For the first stage, first discharge to 2.5V with a current of 1 / 3 C, leave it for 3 minutes, then discharge it to 2.5V with a current of 0.2C, and leave it for 5 minutes;

[0015] (2) Carry out the second stage, first charge with 1 / 3 C current constant current and constant voltage, cut-off voltage 3.75V, cut-off current 0.02C, leave it for 5min, and then discharge with 1 / 3 C current, cut-off voltage 2.5V , set aside for 5min;

[0016] (3) In the third stage, first charge with a constant current of 1 / 3 C, the cut-off voltage is 3.55V, leave it for 5 minutes, and then discharge with a constant current of 1 / 3 C, and the cut-off voltage is 2.5V. The step capacity is used as the dividing capacity, and it is set aside for 3 minutes.

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Abstract

The invention discloses a method for distributing the capacity of a lithium-ion battery. The method comprises the following steps: step 1, carrying out constant current discharge on the battery to be divided, and the discharge current in the constant current discharge stage is 0.1C-0.6C; After the constant current discharge of step 1, the battery is then subjected to constant current constant voltage charging and constant current discharge. The charging current of the constant current constant voltage charging stage in step 2 is 0.3 ~ 0.6C, the cut-off voltage is 3.75V, and the cut-off current is 0.02C, the discharge current of the constant current discharge in step 2 is 0.3 ~ 0.6C; step 3, after the constant current constant voltage charge and constant current discharge in step 2, the battery is then subjected to constant current charge and constant current discharge, The charging current in the constant current charging stage in step three is 0.3-0.6C, the cut-off voltage is 3.55V, and the discharge current in the constant current discharge in step three is 0.3-0.6C.

Description

technical field [0001] The invention relates to a capacity dividing method of a lithium ion battery. Background technique [0002] With the development of economy and society, people's demand for energy is increasing day by day, while the limited storage of traditional fossil fuels and the environmental harm in the process of production and use force people to find, develop and utilize new clean energy, such as solar energy, wind energy, etc. . The utilization of new clean energy is bound to use high-capacity energy storage devices, and lithium-ion batteries have received extensive commercial research due to their excellent performance. Especially since 2010, the rapid development of the electric vehicle industry has promoted lithium-ion batteries. industry development. Lithium-ion batteries are generally classified according to cathode materials. Common cathode materials include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, and lithium iron p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCY02E60/10
Inventor 林辉杨桃耿春华邹海曙王芳
Owner BAILE ELECTROTHERMIC ELECTRIC APPLIANCE JIANGSU