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Capacity grading method for power-type lithium ion battery

A lithium-ion battery, power technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, sustainable manufacturing/processing and other directions, can solve problems such as unfavorable stable and dense organolithium compounds, achieve short time consumption and increase production capacity , the effect of simple process

Inactive Publication Date: 2018-09-14
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current capacity separation method takes about 8 hours and uses two-step deep charge and deep discharge, which is not conducive to the generation of more stable and dense organic lithium compounds (ROCO2Li) in a high charge state.

Method used

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  • Capacity grading method for power-type lithium ion battery
  • Capacity grading method for power-type lithium ion battery
  • Capacity grading method for power-type lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] For the lithium-ion battery after formation and sealing, carry out volume separation at room temperature, the specific steps are:

[0023] (1) Carry out the first charging stage, carry out constant current charging with a current of 0.1C, the charging time is 60 minutes, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 3 minutes;

[0024] (2) Carry out 2 repeated charge and discharge cycles with a current of 0.3C. The discharge and charge time are the same for 30 minutes, and the battery is left for 1 minute after each discharge or charge;

[0025] (3) Carry out constant current and constant voltage charging with a current of 0.6C, the upper limit of time is 60min, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 3min;

[0026] (4) Carry out constant current discharge with a current of 0.5C, the limit time is 110min, and the cut-off voltage is 2.0V.

Embodiment 2

[0028] (1) Carry out the first charging stage, carry out constant current charging with a current of 0.7C, the charging time is 180 minutes, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 2 minutes;

[0029] (2) Carry out 5 repeated charge and discharge cycles with a current of 0.8C, the time of discharge and charge is the same as 40min, and the battery is left for 1min after each discharge or charge;

[0030] (3) Carry out constant current and constant voltage charging with a current of 0.8C, the upper limit of time is 60min, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 3min;

[0031] (4) Carry out constant current discharge with a current of 0.8C, the limit time is 130min, and the cut-off voltage is 2.5V.

Embodiment 3

[0033] (1) Carry out the first charging stage, carry out constant current charging with a current of 0.2C, the charging time is 150 minutes, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 3 minutes;

[0034] (2) Carry out 3 repeated charge and discharge cycles with a current of 0.7C, the time of discharge and charge is the same as 25 minutes, and the battery is left for 1 minute after each discharge or charge;

[0035] (3) Carry out constant current and constant voltage charging with a current of 0.7C, the upper limit of time is 50min, the cut-off voltage is 3.65V, the cut-off current is 0.02C, and it is left for 3min;

[0036] (4) Carry out constant current discharge with a current of 0.6C, the limit time is 110min, and the cut-off voltage is 2.0V.

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Abstract

The invention relates to a capacity grading method for a power-type lithium ion battery. The method successively comprises the following steps of a first constant current changing stage, a charging-discharging circulating stage, a second constant current changing stage, and a constant current discharging stage, wherein a charging current of the first constant current changing stage is 0.1-0.7 C, acharging current of the second constant current changing stage is 0.5-0.8 C, a cut-off voltage is 3.6-5 V, a cut-off current is 0.02 C, and a discharging current of the constant current discharging stage is 0.5-0.8 C. The capacity grading method for the power-type lithium ion battery is short in consumed time, and simple in process, and is capable of stabilizing an SEI film formed in a formationperiod as possible within limited time. A battery through the capacity grading of the capacity grading method is not much different from a battery prepared by an original capacity grading technology in the aspects of discharge capacity and capacity retention ratio. So, the capacity grading method is used for effectively improving the production capacity under the precondition without losing the battery performance.

Description

technical field [0001] The invention relates to the field of production and manufacture of lithium-ion batteries, in particular to a method for dividing the capacity of power-type lithium-ion batteries. Background technique [0002] With the rapid development of social economy, the consumption of fossil fuels, which are non-renewable energy sources, continues to increase, which has a serious impact on the environment, making countries all over the world devote themselves to the research and development of new energy and related technologies. Among them, secondary batteries are highly efficient, clean and pollution-free, and using them as power or auxiliary power sources for internal combustion engine vehicles can effectively reduce fuel consumption. Compared with traditional lead-acid batteries and nickel metal hydride batteries, lithium-ion batteries have obvious advantages in cycle life, energy density, power density and environmental friendliness. Although there is a cer...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 朱庆俊姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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