Current collector and pole plate thereof, and electrochemical device

A technology of current collectors and negative pole pieces, applied in the field of pole pieces and electrochemical devices, can solve the problems of poor electrical conductivity of composite current collectors, and achieve the effects of improving high-rate charge and discharge performance, reducing short-circuit heat generation, and improving binding force.

Inactive 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

However, the conductivity of this composite current collector is poor

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

[0099] 1. Preparation of current collector:

[0100] 1.1 Select a support layer with a certain thickness, drill holes in the support layer, and then form a conductive layer with a certain thickness on the surface of the support layer by vacuum evaporation, and fill the conductive layer in the holes as a conductive material, that is, one-time molding. The conductive layer is deposited on the surface of the support layer and the surface of the hole wall of the hole;

[0101] 1.2 Select a support layer with a certain thickness, form a conductive layer with a certain thickness on its surface by vacuum evaporation, then punch holes, and then fill the holes with conductive materials.

[0102] The formation conditions of the vacuum evaporation method are as follows: the support 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 ° ...

experiment example

[0118] 1. Battery test method:

[0119] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0120] 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.

[0121] The experimental results are shown in Table 3.

[0122] 2. Experimental method and test method of nail penetration experiment:

[0123] 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 ...

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Abstract

The present invention relates to the battery field, especially to a current collector. The current collector comprises a support layer, conductive layers and a conductive material, the conductive layers are located on the two surfaces of the support plate, the current collector is internally provided with a plurality of holes penetrating the support layer and the conductive layers, the holes are filled with the conductive material. The current collector can improve the short-circuit resistance of the battery in the case of short circuit under abnormal conditions, and can greatly reduce the short-circuit current. Therefore, the short-circuit heat generation amount can be greatly reduced, and the safety performance of the battery is improved.

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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/13H01M4/667H01M10/0525H01M4/66H01M4/661H01M4/668Y02E60/10H01M4/663H01M4/70H01M2004/021
Inventor 梁成都黄华锋黄起森刘欣
Owner CONTEMPORARY AMPEREX TECH CO
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