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Electrochemical device and electronic device comprising same

A technology of electrochemistry and electrode assembly, which is applied in the field of electrochemistry and can solve problems such as leakage channels, lithium ion battery leakage, and low strength of adapters

Active Publication Date: 2022-01-25
DONGGUAN POWERAMP TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the tabs in the lithium-ion battery are welded with the thicker (≥0.3mm) adapter piece, the higher ultrasonic welding energy is transmitted to the melting area of ​​the sealing part, which may easily cause the sol to restructure to form a leakage channel, resulting in the sealing of the lithium-ion battery. back leak
[0003] The prior art usually adopts the following two solutions to solve the above problems: the first one is to reduce the welding energy by replacing the thinner adapter sheet to solve the leakage problem, but when the adapter sheet is too thin, the overcurrent is small, and the lithium-ion battery will There is a problem of temperature rise, and when the adapter piece is too thin, the strength of the adapter piece is too low and it is easy to break; the second method is to improve the leakage problem by reducing the welding energy, but this method is not suitable for thicker adapter piece

Method used

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  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069]

[0070] A first area is provided on the first part of the adapter, and the surface roughness of the first area is F 1ZS =0.1F 3S , the area S of the first region 1Z = S 1 . Among them, the thickness of the adapter T=0.1mm, k=∣0.3712-1.807T+2.15T 2 ∣=0.21,F 3S = Ra 0.1, S 1 =0.45cm 2

[0071]

[0072]The above prepared positive electrode sheet, separator, and negative electrode sheet are stacked in order, so that the separator is in the middle of the positive and negative electrodes to play the role of isolation, and stacked to obtain an electrode assembly with a laminated structure. Welding the first lug portion and the first adapter piece through origin spot welding, and welding the second lug portion and the second adapter piece through origin spot welding. Put the welded electrode assembly into an aluminum-plastic film case, remove moisture at 80°C, inject the prepared electrolyte, and obtain a lithium-ion battery through processes such as vacuum packagi...

Embodiment 2

[0074] Except in , T=0.2mm, k=0.1, F 1ZS =0.01F 3S Except, the others are the same as in Example 1.

Embodiment 3

[0076] Except in , F 1ZS =0.09F 3S Except, the others are the same as in Example 2.

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Abstract

The embodiment of the invention provides an electrochemical device and an electronic device comprising the same. In the electrochemical device, a first area is arranged on a first surface, facing a welding printing area, of a first part, and the surface roughness F1ZS of the first area is smaller than the surface roughness F3S of a third part, so that the surface of the first area is smoother. Therefore, the welding energy transmitted to the first sealing part is reduced, the integration and wettability between the first sealing part and the first adapter are improved, the risk of a liquid leakage channel is reduced, and then the liquid leakage risk caused by the existence of the liquid leakage channel after the sealing area of the electrochemical device is sealed is reduced, and the packaging reliability of the electrochemical device is effectively improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, in particular to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] When the tabs in the lithium-ion battery are welded to the thicker (≥0.3mm) adapter piece, the higher ultrasonic welding energy is transmitted to the melting area of ​​the sealing part, which may easily cause the sol to restructure to form a leakage channel, resulting in the sealing of the lithium-ion battery. After leaking. [0003] The prior art usually adopts the following two solutions to solve the above problems: the first one is to reduce the welding energy by replacing the thinner adapter sheet to solve the leakage problem, but when the adapter sheet is too thin, the overcurrent is small, and the lithium-ion battery will There is a problem of temperature rise, and when the adapter piece is too thin, the strength of the adapter piece is too low an...

Claims

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Application Information

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IPC IPC(8): H01M50/533H01M10/0525H01M50/536H01M50/54
CPCH01M50/536H01M50/533H01M50/54H01M10/0525Y02P70/50
Inventor 张辉华王慧鑫汪颖
Owner DONGGUAN POWERAMP TECH LTD
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