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Method for eliminating foreign gas in lithium-ion battery

A lithium-ion battery, impurity gas technology, applied in electrical components, secondary batteries, secondary battery gas removal and other directions, can solve problems such as ineffectiveness, affecting production efficiency, prolonging vacuuming time, etc., to improve quality and production. Efficiency, Effect of Increased Capacity and Efficiency

Active Publication Date: 2016-07-06
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can extract part of the gas, which is more effective for large bubbles, but has little effect on the tiny bubbles adhering between the diaphragm and the pole piece and the gas dissolved in the electrolyte
Therefore, it is difficult to remove this part of the gas in a short time only by vacuuming, and prolonging the vacuuming time will also affect production efficiency

Method used

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  • Method for eliminating foreign gas in lithium-ion battery
  • Method for eliminating foreign gas in lithium-ion battery
  • Method for eliminating foreign gas in lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for removing impurity gas inside a lithium-ion battery of the present embodiment includes the following steps:

[0023] 1) Place the formed lithium-ion battery in the vacuuming box, pull out the sealing plug of the liquid injection hole, and press the pressure needle (titanium alloy cylinder) that conducts ultrasonic waves on the positive and negative housing poles; the described The pressure needle is connected with the ultrasonic generator;

[0024] 2) Start the vacuuming device to vacuumize the vacuuming box until the vacuum degree is -90KPa (negative pressure condition);

[0025] 3) Set the frequency of the first-stage ultrasonic to be 30KHz, and the ultrasonic time is 1min; the frequency of the second-stage ultrasonic is 80KHz, and the ultrasonic time is 1min; start the ultrasonic generator to carry out ultrasonic treatment, and use the first-stage ultrasonic, the interval of 1min, and the second-stage ultrasonic as a cycle , cycle 3 times (total ultras...

Embodiment 5

[0032] The method for removing impurity gas inside a lithium-ion battery of the present embodiment includes the following steps:

[0033] 1) During the formation process, the liquid injection hole of the lithium ion battery is connected to the vacuum device, and the pressure needle (titanium alloy cylinder) that conducts ultrasonic waves is pressed on the positive and negative shell poles; the pressure needle is connected with the ultrasonic generator. ;

[0034] 2) Start the vacuuming device until the vacuum degree inside the lithium-ion battery is -90KPa (negative pressure condition);

[0035] 3) Set the frequency of the first-stage ultrasonic to be 30KHz, and the ultrasonic time is 1min; the frequency of the second-stage ultrasonic is 80KHz, and the ultrasonic time is 1min; The frequency is directly adjusted to the second-level ultrasonic after ultrasonication, and there is no interval between them), and the time of each interval is 30min, and the cycle operation is perfor...

experiment example

[0048] In this experimental example, the effects of the methods of the embodiment and the comparative example on the initial efficiency and internal resistance of the lithium-ion battery for charging and discharging are tested.

[0049] The experimental method is as follows:

[0050] 1. First time efficiency: first discharge capacity / first discharge capacity.

[0051] 2. Internal resistance: measure the AC internal resistance of the battery with an AC internal resistance tester.

[0052] 3.1C cycle life test method:

[0053] a) Test conditions: The cycle test should be carried out at room temperature and 1C charge-discharge current.

[0054] b) Operation method (80% capacity cycle):

[0055] 1) Let stand for 10min;

[0056] 2) Charge according to the following standard charging methods:

[0057] ①At room temperature, the battery is charged with 1C constant current to 3.65V and converted into constant voltage charging;

[0058] ②Charge with 3.65V constant voltage until th...

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Abstract

The invention discloses a method for eliminating a foreign gas in a lithium-ion battery. The method comprises the following steps: in the formation process or after formation, carrying out ultrasonic treatment on the lithium-ion battery and pumping out escaping foreign gas under the condition of keeping a negative pressure in the lithium-ion battery. According to the method for eliminating the foreign gas in the lithium-ion battery, in the formation process or after formation, an ultrasonic wave is applied to the lithium-ion battery under the condition of the negative pressure; bubbles attached to a pole piece and a membrane surface are broken by the defoaming effect of the ultrasonic wave; and the foreign gas dissolved into an electrolyte escapes in a form of micro-bubbles by the cavitation effect of the ultrasonic wave. According to the method, the gas which is dissolved into the electrolyte and generated in the formation process of the lithium-ion battery and the micro-bubbles which are attached to the pole piece and the membrane and between the pole piece and the membrane can be eliminated; the quality of an SEI film of the lithium-ion battery is improved; and the production efficiency of the lithium-ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to a method for removing impurity gas inside a lithium ion battery. Background technique [0002] Lithium-ion batteries will generate various gases during the formation process, such as CO, CO 2 , H 2 , ethylene, etc., these gases are partially attached between the negative electrode and the separator in the form of bubbles, and partially dissolved in the electrolyte. The gas existing in the above two forms will seriously affect the quality of the SEI film on the surface of the negative electrode sheet, and at the same time hinder the insertion of lithium ions in the negative electrode, resulting in a low capacity. On the other hand, these gases easily interact with the active material LiC formed after lithium intercalation in the negative electrode. 6 A reaction occurs to generate some by-products, resulting in a low first charge and discharge ...

Claims

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Application Information

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IPC IPC(8): H01M10/52H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M10/52Y02E60/10Y02P70/50
Inventor 辛晓冬张振朋赵博郭扭田鹏飞李鹏
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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