Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium battery current collector having protective function

A protection function, lithium battery technology, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as abnormal rise, thermal runaway, lithium battery protection, etc., to prevent thermal runaway

Pending Publication Date: 2017-04-05
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD +2
View PDF0 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety issue of lithium batteries has not been completely resolved. The expansion of lithium-ion batteries in the application field requires more single batteries to realize the voltage and capacity of the battery system. It is difficult to be perfect in management and other aspects. Once the battery is abused (such as overcharge, internal or external short circuit, high temperature, etc.), thermal runaway will occur, which will cause fire, explosion and other safety accidents. Safety issues are already high-energy The main obstacle to the large-scale application of density batteries
However, these methods are irreversible, so once the protection occurs, the battery cannot be used again
The polymer PTC thermistor can be used to prevent the overheating of the lithium battery. However, the polymer PTC thermistor assembled outside the lithium battery is far away from the heat generation part inside the battery. Due to the attenuation of the heat during the transfer process, the polymer PTC thermistor The resistance cannot detect the abnormal rise in the internal temperature of the lithium battery in time, and it is difficult to protect the lithium battery in the first place

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium battery current collector having protective function
  • Lithium battery current collector having protective function

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0028] For the lithium battery current collector with protective function of the present invention, its specific implementation is as follows:

[0029] In conductive composites with a positive temperature effect on resistance,

[0030] The polymer substrates are: polyethylene, chlorinated polyethylene, oxidized polyethylene, polyvinyl chloride, butadiene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer, polystyrene, polycarbonate , polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyphenylene sulfide, polyoxymethylene, phenolic resin, polytetrafluoroethylene, four Vinyl fluoride-hexafluoropropylene copolymer, polytrifluoroethylene, polyvinyl fluoride, maleic anhydride grafted polyethylene, polypropylene, polyvinylidene fluoride, epoxy resin, ethylene-vinyl acetate copolymer, polymethacrylate One of esters, ethylene-acrylic acid copolymers and mixtures thereof;

[0031] The resistivity of the conductive powd...

Embodiment 1

[0033] Mix polyethylene and conductive ceramic powder according to the ratio of PTC resistance, set the temperature of the internal mixer to 180 degrees, and the speed to 30 rpm. After 15 minutes of refining, the material is discharged, and a conductive composite material with a positive temperature effect of resistance is obtained.

[0034] The above-mentioned melt-mixed conductive composite material with the positive temperature effect of resistance is rolled by an open mill to obtain a conductive composite material sheet with a thickness of 0.1 mm, which is then hot-pressed into a sheet with a thickness of 0.02 mm. Conductive composite layer with positive temperature effect of resistance.

[0035] The two first and second conductive composite material layers 110a, 110b with the positive temperature effect of resistance are pressed according to figure 1 The metal copper foil 120 is placed on both sides as shown. The above-mentioned three layers are stacked and tightly comb...

Embodiment 2

[0037] The ratio and processing technology of the conductive composite material with the positive temperature effect of resistance are the same as those in Example 1, except that the metal copper foil is changed to metal aluminum foil.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Particle size distribution rangeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium battery current collector having a protective function. The lithium battery current collector comprises metal foil, the metal foil has a first surface and a second surfaces opposite to the first surface and is used as base foil of the lithium battery current collector, the lithium battery current collector also comprises a first conductive composite layer having a resistance positive temperature coefficient, the first conductive composite layer is tightly bonded to the first surface of the metal foil, the lithium battery current collector also comprises a second conductive composite layer having a resistance positive temperature coefficient, and the second conductive composite layer is tightly bonded to the second surface of the metal foil. The lithium battery current collector having a protective function can effectively prevent the lithium battery thermal runaway and improve the safety of lithium batteries.

Description

technical field [0001] The invention relates to a lithium battery current collector with a protective function, in particular to a lithium battery current collector in which a conductive composite material layer with a positive resistance temperature effect is tightly bonded to both sides of a metal foil. Background technique [0002] Generally, Al is used for the positive electrode of the current collector of the lithium battery, and Cu is used for the negative electrode. Because aluminum will intercalate lithium at low potential, it is not suitable for negative electrode collector; copper will be oxidized at high potential, so it is not suitable for positive electrode collector, but aluminum surface has a passivation layer, so it can be used as positive electrode collector. [0003] The polymer-based conductive composite material can maintain a low resistance value at normal temperature, and has the characteristics of being sensitive to temperature changes, that is, when a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/34H01M4/64H01M4/66H01M50/572H01M50/574
CPCH01M4/64H01M4/665H01M4/667H01M10/613H01M50/574Y02E60/10
Inventor 杨铨铨盛建民刘浩涵祝天舒王军闵国全
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com