Formation process of lithium ion battery with lithium nickel cobalt manganese oxide

A technology for lithium ion batteries and lithium nickel cobalt manganese oxide, which is applied in the field of nickel cobalt lithium manganate lithium ion battery formation technology, can solve the problems of increased labor costs, influence on the appearance of batteries, and long formation methods, and achieves dense and uniform improvement. properties, avoid polarization and bulging, improve battery electrical performance and safety performance

Inactive Publication Date: 2018-09-25
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional formation and charging process of nickel-cobalt-lithium-manganese-oxide lithium-ion batteries, low-current charging is used for "pre-formation" to activate the battery cells, and then the "SEI film" is stably formed before pumping. Secondary packaging, followed by secondary charging, the formation method takes a long time, has many process steps, increases labor costs, and has a relatively large impact on the appearance of the battery cell, and cannot well adapt to the delivery cycle of the battery. Therefore, the development A stable and reliable charging method with stable performance and quick formation is very necessary.

Method used

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  • Formation process of lithium ion battery with lithium nickel cobalt manganese oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, a nickel-cobalt-manganese lithium-ion battery formation process, the specific steps are as follows:

[0019] Step 1: Inject electrolyte into the battery and put it aside for 4 hours under high temperature vacuum, so that the pole piece and diaphragm are quickly and fully infiltrated;

[0020] Step 2: Put the battery after the high temperature put aside in the integrated forming equipment that integrates the sectional variable pressure control system, the temperature control system, the time control system, and the forming charge and discharge function. The temperature is 50℃ and the pressure is 0.7Mpa. Reshape the battery core for 1 hour under high pressure to ensure the battery core is flat and make the interface between the positive and negative plates react well;

[0021] Step 3: Charge in two stages. In the first stage, the battery is charged to 30% SOC with a low current of 0.2C at a high temperature, and in the second stage, the battery is charged to ...

Embodiment 2

[0027] In this embodiment, a nickel-cobalt-manganese lithium-ion battery formation process, the specific steps are as follows:

[0028] Step 1: Inject electrolyte into the battery and put it aside for 5 hours under high temperature vacuum to make the pole piece and diaphragm quickly and fully wetted;

[0029] Step 2: Put the battery that has been left at a high temperature into an integrated forming equipment that integrates sub-variable pressure control system, temperature control system, time control system, and forming charge and discharge function at a temperature of 55°C and a pressure of 0.8Mpa. Carry out cell core shaping for 1.5 hours under the state to ensure the cell core is flat and make the positive and negative plate interface react well;

[0030] Step 3: Charge in two stages. In the first stage, the battery is charged to 30% SOC with a low current of 0.25C at a high temperature, and in the second stage, the battery is charged to a high current of 0.75C and charged to 65...

Embodiment 3

[0035] In this embodiment, a nickel-cobalt-manganese lithium-ion battery formation process, the specific steps are as follows:

[0036] Step 1: Inject electrolyte into the battery and put it aside for 6 hours under high temperature vacuum to make the pole piece and diaphragm quickly and fully wetted;

[0037] Step 2: Put the battery that has been left at high temperature in an integrated forming equipment that integrates sub-variable pressure control system, temperature control system, time control system, and forming charge and discharge function at a temperature of 60°C and a pressure of 0.9Mpa. Reshape the battery core for 2 hours in the state to ensure that the battery core is flat and make the interface between the positive and negative plates react well;

[0038] Step 3: Charge in two stages. In the first stage, the battery is charged to 30% SOC with a low current of 0.3C at a high temperature, and in the second stage, the battery is charged to a high current of 1C and charged ...

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Abstract

Disclosed is a formation process of a lithium ion battery with lithium nickel cobalt manganese oxide. Through integrated formation equipment integrated by a segmentation variable pressure control system, a temperature control system, a time controlled system and a formation charge and discharge function, the battery is shaped at high temperature and high voltage, formed at high temperature and high voltage with low current and then heavy current, permitted to stand at normal temperature, performed trickle charge, and finally pumped, sealed and divided. The formation process can effectively improve the dense uniformity of the current during the formation and the matching of the temperature and voltage, avoid the polarization and bulging of the battery, generate a stable SEI film, and improve the electrical performance and safety performance of the battery. The formation method integrates the conventional operation process of preforming-standing-recharging to one step on one machine, which shortens the battery formation time and significantly improves the production efficiency.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery formation process of nickel cobalt manganate. Background technique [0002] At present, lithium ion secondary batteries are mostly used in some miniaturized mobile electrical devices such as mobile phones, notebook computers, and Bluetooth headsets. As lithium-ion battery technology continues to mature and costs continue to decrease, people gradually realize that lithium-ion batteries should have a wider range of applications. In the formation charging process of the traditional nickel-cobalt-manganese lithium-ion battery, low-current charging is used for "pre-formation" to activate the battery cells, and then after the "SEI film" is stably formed, the gas is pumped. Secondary packaging, followed by secondary charging, the formation method takes a long time, the process steps are many, the labor cost increases, and it has a relatively large impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 黄锐升王勇军李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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