Current collector, pole piece using same and battery

A current collector and pole piece technology, applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve problems such as thermal runaway, inability to effectively suppress short-circuit probability, temperature rise, and fire, so as to suppress Joule heat and improve overcharging Safety performance, the effect of improving safety performance

Inactive Publication Date: 2017-06-30
CONTEMPORARY AMPEREX TECH CO
View PDF7 Cites 62 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Safety coatings have played a certain role in the application of lithium-ion batteries, but in large-capacity batteries, especially power batteries, due to the increase in energy and volume, these thinner coatings cannot effectively inhibit Short circuit probability and temperature rise, easy to cause thermal runaway and fire phenomenon

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
  • Current collector, pole piece using same and battery
  • Current collector, pole piece using same and battery
  • Current collector, pole piece using same and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] One, the preparation method of current collector at least comprises the following steps:

[0090] 1. Preparation of PPTC material layer: According to the mass fraction, after melting 60-90% of the polymer, add 10%-40% of conductive agent, mix well and pour into the mold to form the PPTC material layer of required thickness; preferably Yes, the reaction temperature is between 70°C and 160°C depending on the type of polymer used.

[0091] 2. Preparation of current collector: prepare a metal layer on at least one surface of the PPTC material layer by mechanical rolling, bonding, vapor deposition, and electroless plating.

[0092] Second, the preparation of pole pieces:

[0093] 1. Preparation of electrode active material slurry: Add appropriate proportions of electrode active material, binder, and conductive agent to the organic solvent and stir and mix to obtain a uniformly dispersed slurry, with the solid content controlled within the range of 30% to 70%. , the viscosi...

Embodiment

[0100] (1) Preparation of electrolyte

[0101] Using 1M lithium hexafluorophosphate (LiPF 6 ) as a lithium salt, using a mass ratio of 50:50 EC:PC mixed non-aqueous solvent mixed as the electrolyte.

[0102] (2) Preparation of positive electrode current collector

[0103] According to the mass fraction, mix the conductive agent and the polymer according to the ratio shown in Table 1, and press the mold to form a PPTC material layer with a certain thickness after mixing evenly; Al is evaporated onto the thin layer PPTC material by evaporation, A uniformly distributed metal layer with a certain thickness is obtained, thereby obtaining the current collector of the embodiment of the present application.

[0104] The specific process of evaporation is: put the PPTC material layer after surface cleaning treatment in the vacuum coating room, melt and evaporate the high-purity metal wire in the metal evaporation room at a high temperature of 1600 ° C to 2000 ° C, and the evaporated ...

Embodiment 3

[0129] In Example 3, adjusting the thickness of the PPTC to 16 μm has no effect on the test results of the safety performance, but the increase of the thickness will lead to a decrease of the energy density.

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
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of batteries, in particular to a current collector, a pole piece using the same and a battery. The current collector comprises a PPTC (polymeric positive temperature coefficient) material layer and a metal layer, wherein the PPTC material layer is used for bearing the metal layer; the metal layer is used for bearing an electrode active material layer and is located on at least one surface of the PPTC material layer. The PPTC material layer not only is used for bearing the metal layer, but also can have a rapid resistance increasing function at the stage of temperature rising caused by overcharge and short circuiting because of characteristics of the PPTC material, and generation of joule's heat is inhibited by reducing current value. By means of the current collector, the short-circuiting safety performance because of foreign matter can be improved, and the overcharge safety performance can also be improved.

Description

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

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/13H01M4/667H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 刘阳钟开富
Owner CONTEMPORARY AMPEREX TECH CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap