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Preparation method of lithium ion battery

A lithium-ion battery and battery technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of increasing the corrosion degree of the pre-charging cabinet, corroding the pre-charging cabinet, and losing electrolyte, so as to reduce the loss of electrolyte and alleviate Corrosion, the effect of reducing the amount of liquid injection

Inactive Publication Date: 2010-03-31
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current open pre-charging process, the electrolyte will flow out of the shell with the generation of gas, and the more liquid is injected, the greater the loss, resulting in waste of electrolyte, and the outflowing electrolyte will also corrode the pre-charging cabinet
In addition, during the extrusion process before sealing, a large amount of electrolyte will also flow out with the air bubbles, and a lot of electrolyte will be lost
In this case, it is necessary to increase the amount of liquid injection during production to ensure the amount of liquid stored in the battery after extrusion sealing, but this increases the degree of corrosion of the outflowing electrolyte to the pre-charging cabinet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] For the model 423048A battery, put the electrode assembly into the case. After the assembly is completed, keep the liquid injection hole, inject 2.5~2.7g of liquid, and after the opening is pre-charged, first vacuumize the battery. When vacuuming, the internal pressure of the case is maintained at 0.05MPa , to remove the gas between the interlayers inside the battery, and then squeeze along the thickness of the battery to remove excess gas inside the battery and seal the liquid injection hole. In the process of squeezing and sealing the battery, some electrolyte will be brought out while the internal gas is removed, and the average amount of electrolyte left in the battery is 2.2g (there is a large surplus).

Embodiment 2

[0024] For the model 423048A battery, put the electrode assembly into the case. After the assembly is completed, keep the liquid injection hole, inject 2.2~2.4g of liquid, and after the opening is pre-charged, first vacuumize the battery. When vacuuming, the internal pressure of the case is maintained at 0.05MPa , to remove the gas between the interlayers inside the battery, and then squeeze along the thickness of the battery to remove excess gas inside the battery and seal the liquid injection hole. During the process of squeezing and sealing the battery, some electrolyte will be brought out while the internal gas is removed, and the average amount of electrolyte left in the battery is 2.1g (meeting the requirements).

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Abstract

The invention discloses a preparation method of a lithium ion battery, comprising the following steps: a pole group is assembled in a shell and electrolyte solution is injected in the shell, and thenthe shell is closed after the battery is pre-charged, and then vacuumizing is carried out to the inner part of the battery shell after the battery is pr-charged and before the shell is closed. The method can reduce electrolyte solution loss in the pre-charging process, relieves corrosion of the electrolyte solution to a pre-charging cabinet, and fluid inventory in the battery after being sealed can be ensured at the same time.

Description

technical field [0001] The invention relates to a battery preparation method, in particular to a battery preparation method in the field of lithium ion batteries. Background technique [0002] Lithium-ion battery is a high-capacity, high-power battery, which is mainly used in small devices, especially mobile phones, laptop computers, and portable power tools. [0003] A lithium-ion battery generally includes a battery case, an electrode group, and an electrolyte. The electrode group is mainly composed of positive electrode sheets, negative electrode sheets, and separator paper stacked or wound on each other. During the manufacturing process of lithium-ion batteries, it is necessary to assemble the electrode assembly into the battery case, inject electrolyte, and then seal the case after pre-charging. [0004] During the pre-charging process, the battery electrolyte will generate more gas to form bubbles, which will adhere to the middle of the battery electrode group and th...

Claims

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Application Information

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IPC IPC(8): H01M10/38
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 唐红辉王驰伟周冬王弗刚罗朝晖张性双
Owner SHENZHEN BAK BATTERY CO LTD
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