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Manufacturing method of lithium ion battery

A technology of lithium-ion batteries and manufacturing methods, which is applied in the direction of electrolyte storage battery manufacturing, secondary batteries, battery pack parts, etc., can solve the problems of long lithium-ion battery preparation cycle, affecting the preparation cycle, and waste of aluminum-plastic films, etc. The effect of shortening the baking time, reducing the two-sealing process and reducing the production cost

Inactive Publication Date: 2020-02-21
东莞汇洋动力科技有限公司
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Problems solved by technology

However, this traditional process has certain disadvantages: 1) The reserved aluminum-plastic film needs to be removed in the second sealing process, resulting in a large amount of waste of aluminum-plastic film; The baking efficiency is low, which seriously affects the preparation cycle; 3) The preparation cycle of lithium-ion batteries is long, and the fastest preparation time from stacking to liquid injection is still 27h

Method used

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  • Manufacturing method of lithium ion battery
  • Manufacturing method of lithium ion battery
  • Manufacturing method of lithium ion battery

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Embodiment 1

[0029] Such as Figure 1~2 Shown, a kind of manufacturing method of lithium-ion battery comprises the following steps:

[0030] S1, according to the conventional manufacturing process of lithium-ion batteries, a positive electrode sheet with lithium cobalt oxide as the positive electrode material and a negative electrode sheet with graphite as the negative electrode material are produced, and the positive electrode sheet, negative electrode sheet, and separator are laminated to form a bare cell.

[0031] S2. Baking the bare cell in a dry environment with a dew point temperature ≤ -35°C for 0.1 to 1.5 hours, preferably, 0.5 to 1 hour; The cells are packaged in the battery case for 10 minutes, and then injected in the same dry environment for about 20 minutes. Wherein, the bare cell is connected to the tab 1 having a channel 11 for the liquid injection process of the bare cell, and tab glue 2 is provided on the surface of the tab 1 . In addition, before the liquid injection, a...

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Abstract

A manufacturing method of a lithium ion battery comprises the following steps of S1, placing a bare cell in a dry environment for baking, placing the bare cell in a battery shell after baking, and injecting a liquid in the dry environment, wherein the bare cell is connected with a tab with a channel, and the channel is used for a liquid injection process of the bare cell; and S2, after liquid injection is completed, carrying out a formation process, discharging a gas generated by formation from the channel, then sealing the channel, and completing manufacturing of the lithium ion battery. Compared with the prior art, by using the method of the invention, the bare cell is baked firstly, and a baking speed of the unpackaged bare cell is greatly increased due to a fact that the unpackaged bare cell is not wrapped by an external aluminum-plastic film. Besides, the tab with the channel is adopted for liquid injection so that an electrolyte is injected into the battery from an internal channel of the tab, and meanwhile, the gas generated by formation is discharged from the channel so that use of the aluminum-plastic films can be reduced, a large number of aluminum-plastic films are saved, and production cost is reduced.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for manufacturing a lithium ion battery. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. They are widely used in portable appliances, electric tools, large Energy storage, electric transportation power supply and other aspects have broad application prospects. Lithium-ion batteries are mainly divided into cylindrical batteries, square batteries and soft pack batteries according to their shapes, while cylindrical batteries and square batteries are also called hard shell batteries. Compared with hard-shell batteries, soft-pack batteries have the advantages of flexible design, lighter weight, low internal resistance, less explosion, more cycle times, and high energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/26H01M2/36H01M10/0525
CPCH01M10/0525H01M10/058H01M50/531H01M50/60Y02E60/10Y02P70/50
Inventor 覃关键许瑞王易玮
Owner 东莞汇洋动力科技有限公司
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