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Electrochemical device and electronic device

An electrochemical and electrode assembly technology, applied in the field of electrochemical devices and electronic devices, can solve the problems of uncontrollable heat production process, generate a large amount of heat, and affect the safety of electrochemical devices, so as to reduce the risk of thermal runaway and improve safety. performance, avoiding the effect of short-term high-current discharge

Pending Publication Date: 2022-02-25
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When an electrochemical device is used in a high-temperature environment (for example, over 100°C), a large amount of heat is likely to be generated inside the electrochemical device. The heat accumulated inside the electrochemical device will promote chemical reactions inside the device and lead to further heat generation, but this heat generation process cannot It is possible to generate a large amount of heat in a short period of time, which increases the risk of thermal runaway of the electrochemical device and affects the safety of the electrochemical device.

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056]

[0057] Mix positive electrode active materials lithium cobaltate, acetylene black, and polyvinylidene fluoride (PVDF) in a mass ratio of 94:3:3, and then add N-methylpyrrolidone (NMP) as a solvent to prepare a solid content of 75wt%. paste, and stir well. The slurry is uniformly coated on one surface of an aluminum foil with a thickness of 12 μm, dried at 90°C, and cold-pressed to obtain a positive electrode sheet with a positive electrode active material layer thickness of 95 μm, and then coated on the other surface of the positive electrode sheet Repeat the above steps above to obtain a positive electrode sheet coated with a positive electrode active material layer on both sides. Cut the positive pole piece into a size (74mm×867mm) and weld the tabs for use.

[0058]

[0059] Negative active material artificial graphite, acetylene black, styrene-butadiene rubber and sodium carboxymethyl cellulose are mixed in a mass ratio of 96:1:1.5:1.5, then deionized water i...

Embodiment 2

[0067] Except that the shrinkage rate of the heat-shrinkable gummed paper is 90%, and the thickness of the PTC ceramic coating is 0.5 mm, the rest is the same as that of Example 1.

Embodiment 3

[0069] Except that the shrinkage rate of the heat-shrinkable gummed paper is 90%, and the thickness of the PTC ceramic coating is 2mm, the others are the same as in Example 1.

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Abstract

The embodiment of the invention provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode assembly, the electrode assembly comprises a first pole piece, a second pole piece and an isolating membrane, and the isolating membrane is arranged between the first pole piece and the second pole piece; and the isolating membrane is provided with a through hole, one side, facing the first pole piece, of the through hole is provided with thermal shrinkage gummed paper, one side, facing the second pole piece, of the through hole is provided with a thermosensitive layer, the thermal shrinkage gummed paper is used for keeping insulation between the first pole piece and the second pole piece before thermal shrinkage, and the impedance of the thermosensitive layer is increased along with temperature rise. According to the electrochemical device, the electric energy of the electrochemical device can be controllably converted into heat energy, short-time large-current discharge is avoided, the thermal runaway risk of the electrochemical device caused by large-amount heat production in a short time is reduced, and the use safety of the electrochemical device is improved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrochemical device and an electronic device. Background technique [0002] Electrochemical devices (such as lithium-ion batteries) have many advantages such as high specific energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. [0003] When an electrochemical device is used in a high-temperature environment (for example, over 100°C), a large amount of heat is likely to be generated inside the electrochemical device. The heat accumulated inside the electrochemical device will promote chemical reactions inside the device and lead to further heat generation, but this heat generation process cannot If it is not controlled, it may generate a large amount of heat in a short period of time, increasing the risk of thermal runaway of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/409H01M50/449H01M50/572H01M10/0525
CPCH01M50/409H01M50/449H01M50/572H01M10/0525Y02E60/10
Inventor 冯琴
Owner NINGDE AMPEREX TECH
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