Current collector, cell, battery

A current collector and closed curve technology, which is applied to battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of increased battery cost, reduced battery safety, and limited improvement in battery safety. Effect of short-circuit area, reduction of heat generation, and improvement of safety

Active Publication Date: 2021-09-21
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, battery
  • Current collector, cell, battery
  • Current collector, cell, battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of (1) a current collector

[0037] Refer Figure 10 , An aluminum foil having a thickness of 13μm is etched in advance using a laser, the laser is controlled to travel speed 100mm / s, laser frequency control is 300Hz, the laser is controlled to 65% duty cycle, a plurality of laser etched by a continuous or discontinuous round composition circle having a diameter of 3mm, the depth of the scoring groove is 6 m, the width of the notch groove is 10 m, the process control dust note, after laser etching, surface cleaning of the collector, the surface was removed metal fines, may be performed after coating the active material slurry.

[0038] (2) Preparation of cathode plate

[0039] The cathode active material LiNi 1 / 3 CO 1 / 3 Mn 1 / 3 O 2 The conductive agent Super-P, polyvinylidene fluoride binder in a weight ratio 94: 3: 3 in a well-stirred N- methylpyrrolidone solvent system mixing 60min ~ 150min, stirring speed control of 4m / min ~ 10m / min. After mixing, the cat...

Embodiment 2

[0047] A battery was prepared in accordance with the method of Example 1, except that:

[0048] Preparation of (1) a current collector

[0049] Refer Figure 11 , An aluminum foil having a thickness of 13μm is etched in advance using a laser, the laser is controlled to speed down / s, laser frequency control is 300Hz 100mm, 65% duty cycle control of the laser, laser etched by a plurality of successive squares, side of the square of 3mm, the depth of the scoring groove is 6 m, the width of the notch groove is 10 m, the process control dust note, after laser etching, surface cleaning of the collector, removing the metal surface Fenxie , it can then be coated with an active material paste.

Embodiment 3

[0051] A battery was prepared in accordance with the method of Example 1, except that:

[0052] Preparation of (1) a current collector

[0053] Refer Figure 12 , An aluminum foil having a thickness of 13μm is etched in advance using a laser, the laser is controlled to travel speed 100mm / s, laser frequency control is 300Hz, the duty control of the laser 65, laser etched by a plurality of successive square circumscribed circle composition circular diameter of 3mm, square side length of 2.121mm, the depth of the scoring groove is 6 m, the width of the notch groove is 10 m, the process control dust note, after laser etching, set of fluid cleaning the surface to remove metal fines surface, coating may be performed after the active material slurry.

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Abstract

The present invention provides a current collector, an electric core, and a battery. The surface of the current collector is provided with an etching pattern formed by incomplete scoring grooves, and the etching pattern is surrounded by a plurality of continuous or discontinuous closed curves. The closed curve is a closed curve formed by a straight line, a closed curve formed by a curve, or a closed curve formed by a combination of a straight line and a curve. The current collector of the invention can effectively improve the safety of the battery when it is punctured by hard objects, and at the same time, it will not affect the normal use of the battery.

Description

Technical field [0001] The present invention relates to the field of battery, and more particularly to a collector, a battery, a battery. Background technique [0002] In the progressive process of electric vehicles, the energy density of the battery has become a hot spot in the future. The increase in energy density can greatly enhance the battery life, increase the battery life of the electric car, but the safety of the battery will decrease, and the safety risks of electric vehicles will increase. In particular, when the battery is punctured by hard objects, there is a great safety hazard in electric vehicles, and therefore take effective means to improve the safety of the battery. [0003] The widespread use of the surface ceramic coating of the isolation membrane improves the safety of the battery, which reduces the risk of yin and influenz shortation due to abuse during use, but the defect is to increase the cost of the battery, and the surface of the membrane The presence ...

Claims

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Application Information

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Patent Type & Authority Patents(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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