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Micro-electric precharge activation method for lithium ion battery

A technology of lithium ion battery and activation method, applied in the field of lithium ion battery formation, can solve the problems of unstable SEI film, affecting battery performance, etc., and achieve short precharge time, improve yield, and reduce metal impurities to form metal dendrites. effect of probability

Inactive Publication Date: 2019-12-24
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the micro-electricity pre-charge activation method, a stable SEI film is formed on the surface of the negative electrode of the battery through low-current charging, high-temperature aging, and normal-temperature aging, which improves the cycle life of the battery and solves the problem of lithium-ion batteries caused by pre-charging. The SEI film is unstable and affects battery performance

Method used

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  • Micro-electric precharge activation method for lithium ion battery
  • Micro-electric precharge activation method for lithium ion battery
  • Micro-electric precharge activation method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, a 18650 lithium-ion battery is used as the experimental battery, and the battery is selected from the AWA17K07XA batch, with a total of 57548pcs. Its battery parameters are: capacity 2400mAh, positive surface density of the battery is 440±8.8g / m 2 , negative surface density is 219.6±3.9g / m 2 , the thickness of the diaphragm is 18 μm, and the injection volume is 5.25±0.2g.

[0028] Select 23571pcs of them for micro-electric pre-charge activation. The specific steps are: charge the cleaned lithium-ion battery with a micro-current constant current with a charge rate of 0.05C, a charge voltage of 2.4V, and a charge time of 8 minutes; Aging at low temperature for 24 hours, followed by further aging at 25°C for 24 hours, that is, the micro-electricity pre-charge activation process is completed. Then charge the battery to full charge, age, and then perform self-discharge settlement, and calculate the self-discharge rate.

Embodiment 2

[0032] In this embodiment, a 18650 lithium-ion battery is used as the experimental battery, and the battery is selected from the AWA17K07XB batch, with a total of 58200pcs. Its battery parameters are: capacity 2400mAh, positive surface density of the battery is 440±8.8g / m 2 , negative surface density is 219.6±3.9g / m 2 , the thickness of the diaphragm is 18 μm, and the injection volume is 5.25±0.2g.

[0033] Select 23491pcs of them for pre-charging and activation of micro-electricity. The specific steps are: charge the cleaned lithium-ion battery with a micro-current constant current charging rate of 0.05C, the charging voltage is 2.4V, and the charging time is 8min; Aging at low temperature for 24 hours, followed by further aging at 25°C for 24 hours, that is, the micro-electricity pre-charge activation process is completed. Then charge the battery to full charge, age, and then perform self-discharge settlement, and calculate the self-discharge rate.

Embodiment 3

[0037] In this embodiment, a 18650 lithium-ion battery is used as the experimental battery, and the battery is selected from the AWA17K18XA batch, with a total of 60225pcs. The battery parameter is a capacity of 2400mAh, and the positive surface density of the battery is 440±8.8g / m 2 , the surface density of the negative electrode is 220.8±4.3g / m 2 , the thickness of the diaphragm is 20μm, and the injection volume is 5.25±0.2g.

[0038]Select 22640pcs of them for pre-charging and activation of micro-electricity. The specific steps are: charge the cleaned lithium-ion battery with a micro-current constant current charging rate of 0.05C, the charging voltage is 2.4V, and the charging time is 8min; Aging at low temperature for 24 hours, followed by further aging at 25°C for 24 hours, that is, the micro-electricity pre-charge activation process is completed. Then charge the battery to full charge, age, and then perform self-discharge settlement, and calculate the self-discharge r...

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Abstract

The invention discloses a micro-electric precharge activation method for a lithium ion battery. The method comprises the specific steps that 1 the cleaned lithium ion battery is taken and charged withmicrocurrent of 0.02 to 0.06C for 6 to 10 min; 2 the lithium ion battery charged in step 1 is aged at a high temperature of 42 to 48 DEG C for 22 to 25 hours; and 3 the lithium ion battery aged at high temperature in step 2 is aged at normal temperature of 22 to 28 DEG C for 20 to 26 h to complete micro-electric precharge activation of the lithium ion battery. In the micro-electric precharge activation method, a stable SEI film is formed on the negative electrode surface of the battery through low-current charging, high temperature aging and normal temperature aging. The cycle life of the battery is improved. The micro-electric precharge activation method can reduce the self-discharge rate of the lithium ion battery and improve the battery yield. After the lithium ion battery is precharged and activated by using the micro-electric precharge activation method, the self-discharge rate of the lithium ion battery is reduced by 35 to 60%.

Description

technical field [0001] The invention belongs to the technical field of formation of lithium-ion batteries, and in particular relates to a method for micro-electric precharging and activation of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which has the advantages of high discharge voltage, high energy density, light weight, small size, and low environmental pollution. It is widely used in power storage devices, electric vehicles and other fields. With the increasing market demand for lithium-ion batteries, for lithium-ion battery manufacturers, on the one hand, it is necessary to improve the production efficiency of batteries and expand production capacity; on the other hand, it is necessary to ensure product quality, which requires the production of batteries The process is optimized. At present, the degree of mechanization and automation of battery production is relatively high. In the production process of ensur...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 王玉娇侯峰岳绍宇姜彩虹余铧超
Owner SHENZHEN BAK POWER BATTERY CO LTD
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