Current collector, cell and battery

A current collector, closed curve technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of increased battery cost, reduced battery safety, limited improvement in battery safety, etc. Short circuit area, control of heat build-up, effect of improving safety

Active Publication Date: 2019-07-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving energy density can greatly increase the service life of batteries and increase the cruising range of electric vehicles, but at the same time the safety of batteries will be reduced, and the safety risks of electric vehicles will also increase
Especially when the battery is pierced by hard objects, electric vehicles have great safety hazards, so effective means are needed to improve the safety of the battery
[0003] The widespread use of ceramic coatings on the surface of the separator improves the safety of the battery to a certain extent and reduces the risk of short-circuiting the cathode and anode caused by abuse during use, but the disadvantage is that the cost of the battery is greatly increased, and the surface of the separator The presence of ceramic coating will also deteriorate the electrochemical performance of the battery to a certain extent.
In addition, the improvement effect of ceramic coating on battery safety is also limited, especially the safety of the battery when it is punctured by hard objects has not been effectively solved

Method used

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  • Current collector, cell and battery
  • Current collector, cell and battery
  • Current collector, cell and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of current collector

[0037] refer to Figure 10 , the aluminum foil with a thickness of 13 μm is pre-etched by laser, the laser travel speed is controlled to 100mm / s, the laser frequency is controlled to 300Hz, the laser duty cycle is controlled to 65%, and the laser etching pattern consists of multiple continuous or discontinuous Composed of a circle, the diameter of the circle is 3mm, the depth of the notch groove is 6μm, and the width of the notch groove is 10μm. Pay attention to dust control during the treatment process. After the laser etching is completed, the surface of the current collector is cleaned to remove the surface Metal shavings, which can then be coated with active substance slurries.

[0038] (2) Preparation of cathode sheet

[0039] The cathode active material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the conductive agent Super-P, and the binder polyvinylidene fluoride are mixed in the N-methylpyrrolidone solvent system at a weight ratio o...

Embodiment 2

[0047] Prepare the battery according to the method of Example 1, the difference is:

[0048] (1) Preparation of current collector

[0049] refer to Figure 11 , the aluminum foil with a thickness of 13 μm is pre-etched by laser, the laser travel speed is controlled to 100 mm / s, the laser frequency is controlled to 300 Hz, and the laser duty cycle is controlled to 65%. The laser etching pattern consists of multiple continuous squares, The side length of the square is 3mm, the depth of the notch groove is 6μm, and the width of the notch groove is 10μm. Pay attention to dust control during the treatment process. After the laser etching is completed, clean the surface of the current collector to remove the metal powder on the surface , and then the coating of the active material slurry can be carried out.

Embodiment 3

[0051] Prepare the battery according to the method of Example 1, the difference is:

[0052] (1) Preparation of current collector

[0053] refer to Figure 12 , the aluminum foil with a thickness of 13 μm is pre-etched by laser, the laser travel speed is controlled to 100mm / s, the laser frequency is controlled to 300Hz, the laser duty cycle is controlled to 65%, and the laser etching pattern consists of multiple continuous square circumscribed circles The diameter of the circle is 3mm, the side length of the square is 2.121mm, the depth of the notch groove is 6μm, and the width of the notch groove is 10μm. Pay attention to dust control during the treatment process. The surface is cleaned to remove the metal powder on the surface, and then the coating of the active material slurry can be carried out.

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Abstract

The invention provides a current collector, a cell and a battery. The surface of the current collector is provided with etching patterns formed by unpenetrated etching grooves. The etching patterns are composed of patterns formed by enclosing of multiple continuous or discontinuous closed curves, wherein the closed curves are the closed curves formed by straight lines and closed curves formed by curves or the closed curves formed by combination of the straight lines and the curves. The current collector can effectively improve the safety of the battery when the battery is pierced by a hard object without affecting normal use of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a current collector, a battery cell and a battery. Background technique [0002] In the process of the gradual popularization of electric vehicles, the energy density of batteries has become a hot spot for future development. Improving energy density can greatly increase the service life of batteries and increase the cruising range of electric vehicles, but at the same time the safety of batteries will be reduced, and the safety risks of electric vehicles will also increase. Especially when the battery is pierced by hard objects, there is a great safety hazard in electric vehicles, so effective means are needed to improve the safety of the battery. [0003] The widespread use of ceramic coatings on the surface of the separator improves the safety of the battery to a certain extent and reduces the risk of short-circuiting the cathode and anode caused by abuse during use, but the disadvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/76H01M4/133H01M10/0525H01M10/0587
CPCH01M4/133H01M4/76H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 郭明奎王耀辉黄亚萍赵丰刚
Owner CONTEMPORARY AMPEREX TECH CO
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