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Method for cleaning sealed lithium-ferrous disulfide battery

An iron disulfide battery and battery technology, applied to chemical instruments and methods, cleaning methods and utensils, cleaning methods using liquids, etc., can solve the problems of reducing battery electrical performance, battery macula, high conductance requirements, etc., to improve production Efficiency, improved surface cleanliness, and ease of operation

Active Publication Date: 2013-01-09
FUJIAN NANPING NANFU BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because ultrasonic cleaning technology significantly improves the cleaning efficiency and cleaning effect, it has been used in many fields, but it is rarely used in the field of battery cleaning.
The reason is that the battery is different from other general workpieces. First of all, it is a charged body. During the cleaning process, the batteries must be regularly insulated from each other, otherwise it is easy to cause a contact short circuit and the risk of battery short circuit explosion; secondly, it The conductivity of the cleaning solution is very high. If the conductivity of the cleaning solution does not meet certain requirements, the battery will easily generate micro-batteries near the positive and negative electrodes during cleaning, forming self-discharge, and the battery will be damaged due to electrical corrosion. Yellow spots appear on the surface, which affects the appearance quality of the battery and also reduces the electrical performance of the battery
In addition, those skilled in the art generally believe that the cavitation effect may damage the internal structure of the battery, especially the lithium-iron disulfide battery, thereby affecting the actual performance of the battery. Therefore, ultrasonic cleaning is only used to clean the battery before entering the production line. Shell (not filled with cells and electrolyte), but not used for cleaning sealed lithium-iron disulfide batteries

Method used

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Examples

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Effect test

preparation example

[0034] The batteries used in the embodiments of the present invention are all AA batteries, and the preparation method is as follows:

[0035] FeS 2 The powder (natural pyrite collected from Yunfu, Guangdong) is used as the positive electrode active material, and the material is mixed with the conductive agent (graphite and acetylene black) to make the positive electrode powder. Use an organic solvent to make the adhesive into an adhesive, wherein the adhesive is styrene-ethylene / butylene-styrene block copolymer (SEBS, trade name Kraton G1651), and the organic solvent is produced by Shell A mixture of Shell A100 (aromatic solvent) and Shell OMS (isoparaffin), the mixing ratio is 4:6 (weight ratio).

[0036] The above positive electrode powder and binder are mixed in a weight ratio of 2:1 and then stirred to form a slurry. In the dry matter of the positive electrode slurry finally made, the weight ratio of each component is:

[0037] FeS 2 : 91% by weight; graphite: 6% by w...

Embodiment 1

[0044] Take the 20 batteries obtained in the above preparation example and place them on the positioning tray, put them into a cleaning tank with ultrasonic waves, and add pure water with a temperature of 20°C and a conductivity of about 15 μs / cm. The liquid level of the pure water should be higher than Battery, so that the battery can be completely immersed in pure water, turn on the ultrasonic cleaning battery for 5 minutes (frequency is 40KHz, power is 0.5KW), then take out the battery, use a 3kg pressure pure water gun to clean the battery with pure water at 20°C (spray temperature) (Conductivity is about 8μs / cm) Spray all parts of the battery for 4 minutes, then use hot air (pressure 3kg, temperature about 50°C) to dry the moisture on the surface of the battery for 3 minutes, and the cleaned battery is obtained.

Embodiment 2

[0046] Take the 20 batteries obtained in the above preparation example and put them on the positioning tray, put them into a cleaning tank with ultrasonic waves, and add pure water with a temperature of 30°C and a conductivity of about 5 μs / cm. The liquid level of the pure water should be higher than Battery, so that the battery can be completely immersed in pure water, turn on the ultrasonic cleaning battery for 3 minutes (frequency is 120KHz, power is 3.5KW), then take out the battery, use a 3kg pressure pure water gun to spray pure water at 60°C (spray temperature) (Conductivity at this temperature is about 15μs / cm) Spray all parts of the battery for 5 minutes, and then use hot air (pressure 3kg, temperature about 60°C) to dry the moisture on the surface of the battery for 3 minutes, and the cleaned battery is obtained.

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Abstract

The invention provides a method for cleaning a sealed lithium-ferrous disulfide battery, and the method comprises the following steps: an ultrasonic cleaning step: keeping the battery at a state of being completely soaked in a cleaning fluid and ultrasonically cleaning the battery in the cleaning fluid; a pure water spraying step: spraying the ultrasonically cleaned battery with pure water; and adrying step: blow-drying the sprayed battery, wherein the cleaning fluid is pure water or a mixed liquid formed by adding a non-conductive cleaning fluid into the pure water; the conductivity of the cleaning fluid is less than 20 microseconds per centimeter; and the conductivity is a value measured at the use temperature of the cleaning fluid. By using the cleaning method provided by the invention, the electrolytes and greasy dirt in the bound area and sealed area of the battery and at the micro-pore gap of the electroplated layer of the battery can be removed and the surface cleanness of battery can be greatly improved.

Description

technical field [0001] The invention relates to the field of battery cleaning, in particular to a method for cleaning the surface of a sealed lithium-iron disulfide battery by ultrasonic waves. Background technique [0002] In the production process of lithium-iron disulfide batteries, the process of injecting electrolyte solution is required, so the produced batteries (sealed batteries) often have some impurities such as electrolyte solution and production equipment oil stains on the surface of the battery. If they are not cleaned, it is easy to rust the battery and cause pollution. Therefore, after the battery has finished filling, sealing and other processes, in order to ensure the cleanliness of the battery and prepare for future storage and packaging, it is essential to clean the battery. [0003] The existing battery cleaning methods are mainly divided into two types: one is conventional cleaning methods, such as hot water washing, alcohol scrubbing, etc., to clean th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B3/12F26B3/06
Inventor 张清顺苏盛常海涛赵洋林建兴
Owner FUJIAN NANPING NANFU BATTERY
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