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Precharge method of lithium ion batteries

A lithium-ion battery and pre-charging technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature performance of the battery cell, unsatisfactory charging effect, and unsolved polarization problems, so as to achieve good electrical performance, eliminate the problem of uneven charging, Effect of Shortening Precharge Time

Inactive Publication Date: 2012-03-07
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process does not overcome the polarization problem caused by high-current charging, the charging effect is not ideal, and the low-temperature performance of the battery cell is relatively poor

Method used

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  • Precharge method of lithium ion batteries
  • Precharge method of lithium ion batteries
  • Precharge method of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The positive and negative electrode sheets and separators made of lithium cobalt oxide as the positive electrode active material and graphite as the negative electrode active material are made into bare cells by lamination or winding, and then the cells are put into the packaging case and inserted into the Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. Wherein the volume ratio of ethylene carbonate (EC), propylene carbonate (PC) and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two flat plates and apply a pressure of 0.8Mpa, charge it with a current of 0.5C for 15min at an ambient temperature of 45°C, the pre-charged amount is 12.5% ​​of the total electricity of the cell, and form an SEI film on the surface of the negative electrode. Afterwards, it is vacuum-packed, and then the capacity and cycle tests are carried out. The test contents are shown in Table 1.

Embodiment 2

[0023] The positive and negative electrode sheets and separators made of lithium cobalt oxide as the positive electrode active material and graphite as the negative electrode active material are made into bare cells by lamination or winding, and then the cells are put into the packaging case and inserted into the Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. Wherein the volume ratio of ethylene carbonate (EC), propylene carbonate (PC) and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two flat plates and apply a pressure of 1.2Mpa, charge with a current of 0.3C for 30min at an ambient temperature of 23°C, the pre-charged amount is 15% of the total electricity of the cell, and an SEI film is formed on the surface of the negative electrode. Afterwards, it is vacuum-packed, and then the capacity and cycle tests are carried out. The test contents are shown in Table 1.

Embodiment 3

[0025] The positive and negative electrode sheets and separators made of lithium manganate as the positive electrode active material and graphite as the negative electrode active material are made into bare cells by lamination or winding, and then the cells are put into the packaging case and inserted into the Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. Wherein the volume ratio of ethylene carbonate (EC), propylene carbonate (PC) and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two flat plates and apply a pressure of 0.01Mpa, and charge it with a current of 0.05C for 120min at an ambient temperature of 10°C. Afterwards, it is vacuum-packed, and then the capacity and cycle tests are carried out. The test contents are shown in Table 1.

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Abstract

The invention relates to the technical field of lithium ion batteries, especially to a rapid precharge method of lithium ion batteries. The precharge method provided by the invention comprises the following steps of: (1) letting a liquid injection stand, placing an electrical core between two flat plates and applying pressure; (2) precharging the electrical core with heavy current; (3) carrying out vacuum pumping and packaging. The method provided by the invention is used to charge with heavy current under a certain pressure, thus guaranteeing good internal pole piece interface of the electrical core, reducing polarization during the precharging of the electrical core with heavy current, preventing local over-charge of the negative electrode, simultaneously shortening the formation time, guaranteeing the smooth discharge of gas generated during the formation and forming a uniform SEI membrane when precharging the electrical core with heavy current. Therefore, the performance of the electrical core is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a fast precharging method for lithium ion batteries. Background technique [0002] As a green battery, lithium-ion secondary battery has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. and other mobile devices are becoming more and more widely used. The ever-increasing demand for lithium batteries has prompted battery manufacturers to simplify the process and reduce process time to improve production efficiency and meet market requirements. [0003] The formation step of lithium-ion batteries is an important process in battery manufacturing, which is related to the performance of the battery in terms of capacity, cycle life, and high-temperature storage. Pre-charging the lithium battery is the first charging, and the process of forming a solid electrolyte interface or SEI (Solid Elect...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 张小细张丽劳绍江梁如福赵丰刚李明
Owner DONGGUAN AMPEREX TECH
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