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Current collector and application thereof, and pole piece and battery using same

A technology for current collectors and batteries, applied in the field of current collectors, can solve the problems of inability to ensure that the battery continues to work, unable to effectively prevent the short circuit of the lithium ion battery, and the battery cannot continue to work.

Active Publication Date: 2018-07-13
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 application thereof, and pole piece and battery using same
  • Current collector and application thereof, and pole piece and battery using same
  • Current collector and application thereof, and pole piece and battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] 1. Preparation of current collector:

[0128] Select an insulating layer with a certain thickness, form a conductive layer with a certain thickness on its surface by vacuum evaporation, mechanical rolling or bonding, and measure the normal temperature sheet resistance of the conductive layer.

[0129] in,

[0130] (1) The formation conditions of the vacuum evaporation method 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. The evaporated metal After the cooling system in the vacuum plating room, it is finally deposited on the surface of the insulating layer to form a conductive layer.

[0131] (2) The formation conditions of the mechanical rolling method are as follows: place the foil of the conductive layer material in a mechanical roll, roll it to a predetermined thickness by ...

experiment example

[0153] 1. Battery test method:

[0154] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0155] Lithium-ion battery 1 # with lithium-ion battery4 # Charge and discharge 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 make the battery 1C / 1C charge-discharge cycle for 1000 cycles, record the battery discharge capacity of the 1000th cycle, divide the discharge capacity of the 1000th cycle by the discharge capacity of the first cycle, and obtain the capacity retention rate of the 1000th cycle.

[0156] The experimental results are shown in Table 4.

[0157] 2. Battery internal resistance test

[0158] Use an internal resistance meter (model HIOKI-BT3562) to test, and the test environment is: normal temperature 23±2°C. Before the test, short-circuit the positive and negative ends of the i...

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Abstract

The invention specifically relates to a current collector and application thereof, and a pole piece and a battery using the same, belonging to the field of batteries. The current collector of the invention 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 materiallayer; and the normal-temperature film resistance Rs of the conducting layer is no less than 0.016 omega / sq and no more than 420 omega / sq. The current collector provided by the invention can greatlyincrease the short-circuit resistance of the battery in cases of abnormal conditions, allows short-circuit current to be greatly reduced, so heat produced by short circuits is greatly lowered, and heat produced at sites where internal short circuits occur can be totally absorbed by the battery; and thus, the influence of short-circuit damage to the battery is limited to certain points, only pointcircuit break occurs, and the normal operation of the battery in a short period of time is not affected.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to a current collector, its pole pieces, batteries and applications. 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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/662H01M4/667H01M4/663H01M4/664H01M4/668H01M10/0525H01M10/4235Y02E60/10
Inventor 梁成都黄华锋黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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