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Flexible packaging secondary battery tabs and flexible packaging secondary batteries

A secondary battery and flexible packaging technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of battery cycle performance and energy density deterioration, improve electrochemical performance, shorten migration path, and improve lithium precipitation crystal phenomenon

Active Publication Date: 2021-03-05
赵明星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a new type of tab for a soft-packed secondary battery, which can solve the problem that lithium dendrites are generated on the edge of the tab, resulting in deterioration of battery cycle performance and energy density.

Method used

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  • Flexible packaging secondary battery tabs and flexible packaging secondary batteries
  • Flexible packaging secondary battery tabs and flexible packaging secondary batteries
  • Flexible packaging secondary battery tabs and flexible packaging secondary batteries

Examples

Experimental program
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Embodiment 1

[0021] Such as Figure 1~3 As shown, the soft-packaged secondary battery includes a battery cell, an electrolyte, and an aluminum-plastic film 1 for containing the battery cell and the electrolyte. The battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. The material of the positive tab is aluminum, the welding section of the positive tab is welded to the reserved welding area on the positive sheet, the material of the negative tab is nickel, the welding section of the negative tab is welded to the reserved welding area on the negative sheet, and the positive The ear and the negative pole ear are the same except for the different materials.

[0022] The tabs 2 of the positive pole tab and the negative pole tab both include a metal strip 21 and a tab glue 22 located in the middle of the metal strip 21. The metal strip 21 includes a protruding section 211, a welding se...

Embodiment 2

[0025] Except that the thickness (T) of the protruding section 211 is 0.08mm, the width (W) is 5mm, the thickness (T) of the welding section 213 is 0.05mm, the width (W) is 10mm, and the length (L) of the transition section 212 is 1mm Except, all the other are with embodiment 1.

Embodiment 3

[0027] Except that the thickness (T) of the protruding section 211 is 0.04mm, the width (W) is 5mm, the thickness (T) of the welding section 213 is 0.02mm, the width (W) is 10mm, and the length (L) of the transition section 212 is 2mm Except, all the other are with embodiment 1.

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Abstract

The invention provides a flexible package secondary battery tab, which comprises a metal strip and a tab glue arranged in the middle of the metal strip, the metal strip includes a protruding section and a welding section, and the width of the welding section is larger than the protruding section. The width of the section, the thickness of the welding section is smaller than the thickness of the extension section, and the cross-sectional area of ​​the welding section is greater than or equal to the cross-sectional area of ​​the extension section. By setting the tab as a special structure, using a wider and larger cross-sectional welding section can ensure the welding quality of the tab and the pole piece, and at the same time, the small thickness of the welding section can effectively reduce the pressure on the tab at the welding place , shorten the migration path of lithium ions at the tabs, especially at the edge of the tabs, and improve the lithium crystallization phenomenon, thereby significantly improving the electrochemical performance of the flexible packaging secondary battery, especially the cycle life and energy density. The invention also provides a soft package secondary battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a soft-packaged secondary battery tab and the soft-packaged secondary battery. Background technique [0002] Flexible packaging secondary batteries have the characteristics of simple structure, changeable shape, and high energy density. The application fields are becoming more and more extensive, and the demand is also increasing. With the continuous development of flexible packaging secondary batteries, people's demand for soft packaging battery energy Density puts forward higher requirements, not only in the field of small electronic products, but also puts forward strict requirements on the energy density of larger soft-packaged secondary batteries used in power and other fields, which prompts people to continue to improve materials, processes, and flexible-package battery structures. In-depth research to improve the energy density of flexible packaging secondary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/531H01M10/0525
CPCH01M10/0525H01M50/531Y02E60/10
Inventor 石海敏邓耀明宋晓娜常嵩韦明和邓赛君杨文平
Owner 赵明星