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Method for mfg. cylinder type lithium ion secondary battery

A technology of a secondary battery and a manufacturing method, which is applied in the field of battery manufacturing, can solve problems such as premature opening of an air pressure protection device, and achieve the effects of simple manufacturing, prolonged service life, and safe and reliable service life.

Inactive Publication Date: 2006-06-14
TIANJIN LISHEN BATTERY
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AI Technical Summary

Problems solved by technology

The gas generated when the SEI film is formed at the initial stage of battery charging is discharged to solve the problem of premature opening of the air pressure protection device due to the increase in the internal pressure of the battery, and at the same time improve the electrical performance of the battery

Method used

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Embodiment Construction

[0013] Below in conjunction with preferred embodiment, the specific implementation mode provided according to the present invention is described in detail as follows:

[0014] In order to achieve the above object, the technical solution adopted by the present invention is: a manufacturing method of a cylindrical lithium-ion secondary battery. First, the pole is assembled into the shell, and the negative electrode ear is welded at the bottom of the shell, and then roll grooves and glue are applied; its characteristics To use a battery case with a liquid injection hole at the bottom, proceed to the following steps in sequence:

[0015] (1) Weld the positive ear on the cover, bend the ear to cover the battery cover, and seal it;

[0016] (2) Quantitatively inject the electrolyte into the battery from the liquid injection hole at the bottom of the shell, connect the battery upside down to the formation device, charge it with a constant current, and then evacuate it to a negative p...

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Abstract

The invention relates to a method for making a cylindrical Li-ion secondary cell, characterized in that it adopts a cylindrical case with liquid injection hole at the bottom, and making according to the steps of: putting pole group into a case, welding cathode ear at the bottom of the case, rolling grooves, dropping glue, welding anode ear and bent pole ear, putting on the cell cover and sealing; quantitatively injecting electrolyte through the bottom of the case into the cell, putting the cell upside down to connect with a chemical conversion device and charging the cell with constant current 0.1C-0.3C for 0.5h-2h, vacuumizing to negative pressure of -0.4MPaí¬0.9MPa for 1min-5min; then removing the pressure and making secondary quantitative liquid injection according to the cell weight; and finally sealing the bottom liquid injection hole by sealing ball or welding means. The invention can effectively reduce the air pressure in the cylindrical cell and improve the electric performance of the cell, safe and reliable.

Description

technical field [0001] The invention relates to a method for manufacturing a battery, in particular to a method for manufacturing a cylindrical lithium ion secondary battery. Background technique [0002] At present, industrial lithium-ion secondary batteries still use a carbon negative electrode and an organic electrolyte system. When the battery is charged for the first time, the polar aprotic solvent in the electrolyte will inevitably be in the phase between the carbon negative electrode and the electrolyte. The reaction on the interface forms a layer of SEI film, which acts to prevent the solvent of the electrolyte from continuing to react on the surface of the negative electrode sheet. However, during the formation of the SEI film, gas is generated, and according to the theory, the voltage for the formation of the SEI film is 0-2.5V, so the SEI film has been formed at the initial stage of the battery's first charge. In this way, due to the increase of the internal air ...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCY02E60/10Y02P70/50
Inventor 王荣高俊奎
Owner TIANJIN LISHEN BATTERY
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