Current collector, pole sheet and electrochemical device

A current collector and pole piece technology, applied in electrochemical generators, electrode carriers/current collectors, circuits, etc., can solve problems such as the inability to effectively prevent the short circuit of lithium-ion batteries, the inability to guarantee the continued operation of the battery, and the failure of the battery to continue to work. , to achieve the effects of improving high-rate charge and discharge performance, improving electrolyte wettability, improving long-term reliability and service life

Active Publication Date: 2020-01-07
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 improved methods, after the internal short circuit occurs in the battery, the temperature of the battery will still rise sharply. When the temperature of the battery rises suddenly, if the safety components cannot respond quickly, there will still be different degrees of danger; 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 sheet and electrochemical device
  • Current collector, pole sheet and electrochemical device
  • Current collector, pole sheet and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] 1. Preparation of insulating layer with specific light transmittance

[0120] The material of the insulating layer is PET. Add a certain amount of colorant carbon black to the PET and mix it evenly. After extrusion casting, cold roll rolling and biaxial stretching in the PET hot melt state, a specific light transmittance can be obtained. insulation layer.

[0121] 2. Preparation of current collector:

[0122] 2.1 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 of the hole;

[0123] 2.2 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 running through the insulating layer and the conductive layer; ...

experiment example

[0149] 1. Battery cycle life test method:

[0150] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0151] 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.

[0152] The experimental results are shown in Table 3.

[0153] 2. Experimental method and test method of nail penetration experiment:

[0154] Nail piercing test: After the battery is fully charged, fix it. At room temperature, a steel needle with a diameter of 8mm will penetrate the batter...

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Abstract

The application belongs to the field of batteries and relates to a current collector. The current collector includes an insulating layer and a conducting layer, wherein the conductive layer is positioned on at least one surface of the insulating layer; the current collector further comprises a first protective layer arranged on a surface, far away from the insulating layer, of the conducting layer; a plurality of holes penetrating through the insulating layer, the conducting layer and the first protective layer are formed in the current collector; and the first protective layer is a metal oxide protective layer. According to the current collector provided by the invention, short-circuit resistance during a short circuit under the abnormal condition of a battery can be improved, so that heat generated the short circuit can be greatly reduced, and therefore, the safety performance of the battery is improved; the mechanical strength of the conductive layer can be improved through the protective layer; the working stability of the current collector is improved; the service life of the current collector is prolonged; the plurality of holes penetrating through the insulating layer and the conductive layer can facilitate the passage of electrolyte, and therefore, the wettability of the electrolyte can be improved, and the electrochemical performance of the battery and the weight energy density of the battery can be improved.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a current collector, a pole piece and an electrochemical device. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics products 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, it is easy to catch fire and explode, causing serious harm. Therefore, the safety problem of lithium-ion batteries limits the application and popularization of lithium-ion batteries to a great extent. [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 the short circuit in the battery, researchers have tried to improve the structure of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/13H01M10/0525
CPCH01M4/667H01M4/80H01M4/13H01M10/0525H01M4/64H01M4/668H01M4/70H01M4/742Y02E60/10H01M4/661
Inventor 梁成都黄华锋黄起森刘欣
Owner CONTEMPORARY AMPEREX TECH CO
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