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Current collector, pole piece of current collector and battery

A technology of current collectors and positive current collectors, applied in the field of batteries, can solve the problems of inability to effectively prevent the short circuit of lithium ion batteries, inability to ensure that the battery continues to work, and the battery can not continue to work, etc., to improve work stability and service life, short circuit The effect of reducing the current and improving the safety performance

Active Publication Date: 2019-06-11
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods in the prior art cannot effectively prevent the occurrence of a short circuit in the lithium-ion battery, and there is no guarantee that the battery can continue to work after the abnormal situation occurs.
In the above-mentioned improved methods, after the internal short circuit occurs in the battery, the battery temperature will still rise sharply. When the battery temperature rises suddenly, if the safety components cannot respond quickly, there will still be different degrees of danger; and in the above-mentioned improvements In the method, after the safety component responds, although the potential safety hazard of the battery is resolved, the battery cannot continue to work

Method used

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  • Current collector, pole piece of current collector and battery
  • Current collector, pole piece of current collector and battery
  • Current collector, pole piece of current collector and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0106] 1. Preparation of current collector:

[0107] Select an insulating layer of a certain thickness, form a conductive layer of a certain thickness on its surface by vacuum evaporation, mechanical rolling or bonding, and form a protective layer by vapor deposition, in-situ formation or coating.

[0108] 1.1 Formation of conductive layer

[0109] There are several ways to form the conductive layer:

[0110] (1) The formation conditions of the vacuum evaporation method of the conductive layer are as follows: the insulating layer that has been cleaned on the surface is placed in a vacuum coating room, and the high-purity metal wire in the metal evaporation room is melted and evaporated at a high temperature of 1600 ° C to 2000 ° C. After evaporation, The metal passes through the cooling system in the vacuum plating room, and finally deposits on the surface of the insulating layer to form a conductive layer.

[0111] (2) The formation conditions of the conductive layer mechan...

experiment example

[0141] 1. Battery test method:

[0142] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0143] Charge and discharge the lithium-ion battery at two temperatures of 25°C and 45°C, that is, first charge to 4.2V with a current of 1C, and then discharge to 2.8V with a current of 1C, and record the discharge capacity of the first week; Then the battery was subjected to a 1C / 1C charge-discharge cycle for 1000 cycles, and the battery discharge capacity of the 1000th cycle was recorded, and the discharge capacity of the 1000th cycle was divided by the discharge capacity of the first cycle to obtain the capacity retention rate of the 1000th cycle.

[0144] The experimental results are shown in Table 4.

[0145] 3. Experimental and testing methods for one nail penetration experiment and six consecutive nail penetration experiments:

[0146] (1) One-time nail-piercing experiment: After the battery is fully charged, fix it, and at room temperat...

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Abstract

The invention relates to the battery field, in particular to a current collector, a pole piece of the current collector and a battery. The current collector comprises an insulating layer and a conducting layer, wherein the insulating layer is used for bearing the conducting layer; the conducting layer is used for bearing an electrode active material layer, the conducting layer is located on at least one surface of the insulating layer, and the thickness of the conducting layer is D2, wherein D2 meets the relation of 300nm<=D2<=2 microns; the current collector also comprises a protective layerarranged on at least one surface of the conducting layer. Through the current collector, short-circuit resistance generated in a short circuit when the battery is abnormal can be increased, so that ashort-circuit current is substantially reduced, short-circuit heat output is greatly lowered, and the safety of the battery is improved; meanwhile, the protective layer can improve the mechanical strength of the conducting layer, so that the safety of the battery is further improved; and besides, the conducting layer can be prevented from being damaged or subjected to oxidation, corrosion and other phenomena, so that the working stability of the current collector is remarkably improved, and the service life of the current collector is remarkably prolonged.

Description

technical field [0001] The present application relates to the battery field, in particular, to a current collector, its pole pieces and a battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. However, when lithium-ion batteries are subjected to abnormal conditions such as extrusion, collision or puncture, they are prone to fire and explosion, causing serious hazards. Therefore, the safety problems of lithium-ion batteries have largely limited the application and popularization of lithium-ion batteries. [0003] A large number of experimental results show that the short circuit in the battery is the root cause of the safety hazard of lithium-ion batteries. In order to avoid short circuits in the battery, researchers have tried to improve the structure of the separator, the mechanical str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/131H01M10/0525
CPCH01M4/64H01M4/661H01M4/662H01M4/663H01M4/664H01M4/667H01M10/052H01M10/0525H01M10/4235Y02E60/10H01M4/668H01M2004/028
Inventor 梁成都黄华锋黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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