Safety type lithium battery and preparation method thereof

A lithium battery and safety technology, applied in the field of safety lithium battery and its preparation, can solve the problems of safety threats, poor pressure relief control accuracy, easy corrosion of explosion-proof devices, etc., and achieve the effect of ensuring normal operation and preventing flatulence

Inactive Publication Date: 2018-08-17
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For batteries with metal casings, explosion-proof devices are usually installed on the shell. Common explosion-proof devices include explosion-proof valves, explosion-proof membranes, explosion-proof needles, explosion-proof notches, etc., but these explosion-proof devices are easily corroded, resulting in failure, and the accuracy of pressure relief control poor
For non-metallic flexible packaging lithium-ion batteries, one is to use the air bag type exhaust method, and an air bag is provided on the packaging film, which is used to carry the gas generated during the inflation process, but the structure of the battery prepared by this method is not compact enough. As the volume of the battery increases, the cost of aluminum-plastic film packaging also increases, and the gas in the airbag cannot be discharged from the battery in time, which is an incomplete way to cure the symptoms; the other is to set a pressure relief valve on the edge of the battery. , to discharge the gas through the pressure relief valve, but this method may lead to poor sealing. In addition, it may cause liquid leakage or introduce air into the battery during the pressure relief and exhaust process, which still poses certain safety threats.

Method used

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  • Safety type lithium battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Take 22 sheets of positive electrodes and 23 sheets of negative electrodes coated with separators, stack them in sequence according to the negative electrode, positive electrode, and negative electrode to prepare the battery cell 1, and weld the positive and negative electrode lugs 3. Afterwards, the aluminum-plastic film 2 is used to package the battery cell, such as figure 1 , encapsulate the upper side (side of the pole ear), the left side of the battery, and reserve part of the space at the bottom of the battery cell. This space communicates with the cell area, and then put the material bag 5 with the gas adsorbent 6 into the reserved space inside the battery. The pore size of the material bag is 100nm, and the gas adsorption body is activated carbon with a mass of 10g. The battery can be completely packaged after the battery cell is vacuum baked. After the battery is prepared, 100g of electrolyte is injected, and it is left for 24 hours before pre-charging. Final...

Embodiment 2

[0026] Take 22 sheets of positive electrodes and 23 sheets of negative electrodes coated with separators, stack them in sequence according to the negative electrode, positive electrode, and negative electrode to prepare the battery cell 1, and weld the positive and negative electrode lugs 3. Afterwards, the aluminum-plastic film 2 is used to package the battery cell, such as figure 1 , encapsulate the upper side (side of the pole ear), the left side of the battery, and reserve part of the space at the bottom of the battery cell. This space communicates with the cell area, and then put the material bag 5 with the gas adsorbent 6 into the reserved space inside the battery. The pore size of the material bag is 600nm, and the gas adsorption body is activated carbon with a mass of 2g. The battery can be completely packaged after the battery cell is vacuum baked. After the battery is prepared, 100g of electrolyte is injected, and it is left for 24 hours before pre-charging. Finall...

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Abstract

The invention discloses a safety type lithium battery, which comprises a battery core and a safety explosion-proof device, wherein the safety explosion-proof device is arranged at the reserved space at the bottom portion of the battery core of the lithium battery, and the reserved space is communicated to a region for accommodating the battery core. The invention further discloses a preparation method of the safety type lithium battery.

Description

technical field [0001] The invention relates to the technical field of manufacturing soft-packaged lithium-ion batteries, in particular to a safe lithium battery and a preparation method thereof. Background technique [0002] In recent years, due to the non-renewable energy crisis and serious environmental pollution problems, people are committed to the development of new energy sources. Compared with other types of rechargeable batteries, lithium-ion batteries have large specific capacity, high working voltage, long cycle life, small size, and low weight. The advantages of light, green and environmental protection are not only widely used in portable electronic devices, but also large-capacity lithium-ion batteries have been used in electric vehicles, and will become one of the main power sources for electric vehicles in the 21st century. In addition, in artificial satellites, There are also applications in aerospace and energy storage. With the rapid development of lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/12H01M10/0525H01M10/058H01M10/52H01M50/30H01M50/35
CPCH01M10/0459H01M10/0525H01M10/058H01M10/52H01M50/35H01M50/394Y02E60/10Y02P70/50
Inventor 杨道均栗晓杰吴宁宁唐宏武
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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