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Current collector as well as pole piece and battery and application thereof

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

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 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 as well as pole piece and battery and application thereof
  • Current collector as well as pole piece and battery and application thereof
  • Current collector as well as pole piece and battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0139] 1. Preparation of current collector:

[0140] Select an insulating layer with a certain thickness, and 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.

[0141] in,

[0142] (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.

[0143] (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...

experiment example

[0178] 1. Battery test method:

[0179] Carry out cycle life test on lithium-ion battery, the specific test method is as follows:

[0180] 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.

[0181] The experimental results are shown in Table 4.

[0182] 2. Battery internal resistance test

[0183] 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 inter...

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Abstract

The invention relates to the field of batteries, in particular to a current collector as well as a pole piece and a battery and an application thereof. The current collector comprises an insulation layer with a supporting function and a conductive layer with a conductive and current collection function, wherein a normal-temperature thin-film resistance RS of the conductive layer satisfies: RS is greater than or equal to 0.01 omega and less than or equal to 0.15 omega. By adopting the current collector, the short-circuit resistance when in short circuit under the abnormal condition of a batterycan be greatly increased, so that the short-circuit current is greatly reduced, the short-circuit heat can be greatly reduced, and the safety performance of the battery can be greatly improved; and in addition, due to the small heat yield, the heat produced at a point having the internal short circuit can be completely absorbed by the battery, the temperature increase of the battery is small, sothat the influence of the short-circuit damage for the battery can be limited in a range of the point, and only the point short circuit is formed without influencing the normal work of the battery ina short time.

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 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 th...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/64H01M4/662H01M4/664H01M4/667H01M10/052H01M10/4235H01M4/661H01M4/663H01M10/0525Y02E60/10Y02P70/50H01M10/486H01M50/581
Inventor 梁成都黄华锋黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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