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Current collector and pole plate thereof, and electrochemical device

A current collector and pole piece technology, applied in the field of pole pieces and electrochemical devices, can solve the problems of inability to effectively prevent the short circuit of lithium ion batteries, unable to ensure that the battery continues to work, and the battery cannot continue to work, etc., to improve high-rate charge and discharge. performance, improve the wettability of electrolyte, and improve the effect of weight energy density

Active Publication Date: 2019-09-17
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 and pole plate thereof, and electrochemical device
  • Current collector and pole plate thereof, and electrochemical device
  • Current collector and pole plate thereof, and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] 1. Preparation of current collector:

[0095] 1.1 Select an insulating layer of a certain thickness, drill holes in the insulating layer, and then form a conductive layer of a certain thickness by vacuum evaporation, so that the conductive layer is deposited on at least one surface of the insulating layer and the surface of the hole wall;

[0096] 1.2 Select an insulating layer of a certain thickness, form a conductive layer of a certain thickness on its surface by vacuum evaporation, and then punch holes to form a plurality of holes through the insulating layer and the conductive layer;

[0097] 1.3 Take an insulating layer of a certain thickness, form a conductive layer of a certain thickness on its surface by vacuum evaporation, then drill holes, and then deposit a conductive layer on the plane surface, the hole wall surface or the hole wall surface and the plane surface.

[0098] The formation conditions of the conductive layer vacuum evaporation method are as follo...

experiment example

[0114] 1. Battery test method:

[0115] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0116] 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 1000 cycles of 1C / 1C charge and discharge, 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.

[0117] The experimental results are shown in Table 3.

[0118] 2. Experimental method and test method of nail penetration experiment:

[0119] Nail piercing test: After the battery is fully charged, fix it, and at room temperature, insert a steel needle with a diameter of 8mm through the battery at a ...

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Abstract

The present application relates to the field of batteries, and in particular, to a current collector and a pole piece thereof, and an electrochemical device. The current collector comprises an insulating layer and a conducting layer, wherein the conducting layer is positioned on at least one surface of the insulating layer, and the normal-temperature film resistance RS of the conducting layer meets the inequation as shown in the description; a plurality of holes penetrating the insulating layer and the conducting layer are formed in the current collector. The current collector can improve the short-circuit resistance of the battery in the case of short circuit under the abnormal condition, so that the short-circuit current is greatly reduced, the short-circuit heat production is greatly reduced, and the safety performance of the battery is improved; the plurality of holes arranged in the current collector can facilitate pass of the electrolyte, can reduce the polarization of the pole plate and the battery and can improve the electrochemical performance of the battery; and moreover, the holes arranged in the current collector can further reduce the weight of the current collector and can improve the weight energy density of the battery.

Description

technical field [0001] The present application relates to the battery field, in particular, to a current collector, its pole piece and an electrochemical device. 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...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/80H01M4/131H01M10/0525H01M10/42H01M4/02
CPCH01M4/667H01M4/80H01M4/131H01M10/0525H01M10/4235H01M4/13H01M4/70H01M4/661H01M4/668H01M4/663Y02E60/10H01M2004/021
Inventor 梁成都黄华锋黄起森刘欣
Owner CONTEMPORARY AMPEREX TECH CO
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