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Battery pole pieces and cells

A battery pole piece and pole piece technology, which is applied to battery electrodes, electrode carriers/collectors, secondary batteries, etc., to achieve the effect of reducing battery weight and improving battery safety performance

Active Publication Date: 2020-12-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the metal layers on the two surfaces of the composite current collector are not electrically conductive, the traditional multi-tab transfer welding structure cannot be used to realize the electrical connection between the internal multi-layer tab and the external tab.

Method used

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  • Battery pole pieces and cells
  • Battery pole pieces and cells
  • Battery pole pieces and cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A positive current collector is composed of PET with a thickness of 12um as the polymer layer and Al with a thickness of 0.5um as the metal layer. The positive electrode active material lithium cobaltate (LiCoO2), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed according to a weight ratio of 97.5:1.0:1.5, and N-methylpyrrolidone (NMP) was added as a solvent. Prepare a slurry with a solid content of 0.75 and stir evenly. The slurry was evenly coated on the positive electrode current collector, leaving a 15 cm blank area on both sides of the positive electrode current collector. After the coating is completed, it is dried and cold pressed. By adjusting the parameters of laser die-cutting and cutting off the redundant empty foil area, five pole pieces with a width of 10mm and lengths of 14mm, 12mm, 10mm, 8mm and 6mm were obtained.

[0048] Using copper foil as the negative electrode current collector, mix the negative electrode active mat...

Embodiment 2

[0051] A positive current collector is composed of PET with a thickness of 12um as a polymer layer and Al with a thickness of 1.0um as a metal layer. The positive electrode active material lithium cobaltate (LiCoO2), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed according to a weight ratio of 97.5:1.0:1.5, and N-methylpyrrolidone (NMP) was added as a solvent. Prepare a slurry with a solid content of 0.75 and stir evenly. The slurry was evenly coated on the positive electrode current collector, leaving a 15 cm blank area on both sides of the positive electrode current collector. After the coating is completed, it is dried and cold pressed. By adjusting the parameters of laser die-cutting and cutting off the redundant empty foil area, five pole pieces with a width of 10mm and lengths of 14mm, 12mm, 10mm, 8mm and 6mm were obtained.

[0052] Using copper foil as the negative electrode current collector, mix the negative electrode active materia...

Embodiment 3

[0055] A positive current collector is composed of PET with a thickness of 12um as the polymer layer and Al with a thickness of 0.5um as the metal layer. The positive electrode active material lithium cobaltate (LiCoO2), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed according to a weight ratio of 97.5:1.0:1.5, and N-methylpyrrolidone (NMP) was added as a solvent. Prepare a slurry with a solid content of 0.75 and stir evenly. The slurry was evenly coated on the positive electrode current collector, leaving a 15 cm blank area on both sides of the positive electrode current collector. After the coating is completed, it is dried and cold pressed. By adjusting the parameters of laser die-cutting and cutting off the redundant empty foil area, five pole pieces with a width of 10mm and lengths of 14mm, 13mm, 12mm, 11mm and 10mm were obtained.

[0056] Using copper foil as the negative electrode current collector, mix the negative electrode active m...

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Abstract

The embodiment of the present application relates to battery pole pieces and battery cells. A battery pole piece according to an embodiment includes: a pole piece body having a length direction and a width direction perpendicular to the length direction; and a plurality of tabs connected to the pole piece body, each of the plurality of tabs having a width The width in the direction, and the length in the length direction; wherein, the width or length of each tab is different. The battery pole piece and the battery cell provided by the embodiment of the present application can reduce the weight of the battery while improving the safety performance of the battery, and ensure that each tab in the battery pole piece can be electrically conducted well with the outside world.

Description

technical field [0001] The embodiments of the present application relate to the field of batteries, in particular to battery pole pieces and battery cells. Background technique [0002] Lithium-ion batteries have been widely used in various electronic products and electric vehicles due to their advantages such as large specific energy, high working voltage, low self-discharge rate, small size and light weight. As the market's requirements for battery safety performance continue to increase, it is not only necessary to ensure that the battery has no potential safety hazards during normal use, but also to ensure that the battery does not ignite, burn or explode after being subjected to various damages such as violent impacts and punctures. . [0003] Traditional lithium-ion batteries usually use metal foils such as copper foil, aluminum foil, and nickel foil to make current collectors for electronic conduction. However, the safety performance of this lithium-ion battery is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/26H01M4/66H01M4/80H01M4/131H01M10/0525H01M10/0587H01M50/531H01M50/534H01M50/536H01M50/538
CPCH01M4/667H01M4/661H01M4/80H01M4/131H01M10/0525H01M10/0587H01M50/538H01M50/536H01M50/534Y02E60/10Y02P70/50H01M10/0431
Inventor 李翔王慧鑫胡乔舒张益博
Owner NINGDE AMPEREX TECH
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