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

Lithium ion battery and preparation method thereof

A lithium-ion battery and battery technology, applied in electrode manufacturing, secondary batteries, battery pack components, etc., can solve problems such as internal short circuits in batteries, and achieve the effects of easy production automation, production automation, and waste reduction.

Active Publication Date: 2013-08-28
BYD CO LTD
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the lithium-ion battery in the prior art is easy to cause internal short circuit under high temperature conditions, and to provide a lithium ion battery that is not prone to internal short circuit under high temperature conditions and its preparation method

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 ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020]The preparation method of the lithium-ion battery provided by the present invention includes attaching the positive electrode material and the negative electrode material on the two surfaces of the positive electrode current collector and the negative electrode current collector respectively, and connecting the surface of one end of the positive electrode current collector and the surface of one end of the negative electrode current collector respectively. Positive pole tabs and negative pole tabs, positive pole pieces and negative pole pieces are prepared, and then the diaphragm is arranged between the positive pole pieces and the negative pole pieces to be wound to form an electrode group, the electrodes are assembled into the battery case and electrolyte solution is injected into it, wherein, The method also includes, after connecting the tabs and before preparing the electrode group, using an insulating coating to form an insulating coating layer on at least the follow...

Embodiment 1

[0030] This example is used to illustrate the lithium ion battery provided by the present invention and its preparation method.

[0031] 1. Preparation of positive electrode sheet

[0032] 100 g of LiCoO 2 The powder, acetylene black, PVDF and NMP were mixed in a weight ratio of 100:3:2:50 to prepare positive electrode slurry. The positive electrode slurry was evenly coated on a 16 micron aluminum foil, dried and rolled to obtain a positive electrode sheet with a thickness of 140 microns.

[0033] 2. Preparation of negative electrode sheet

[0034] Artificial graphite, SBR, CMC and water are mixed in a weight ratio of 100:2.5:1.5:120 to prepare negative electrode slurry, which is evenly coated on the surface of copper foil with a thickness of 10 microns, dried and rolled to obtain Negative electrode sheet with a thickness of 130 microns.

[0035] 3. Form a coating with insulating paint

[0036] Polyvinylidene fluoride (Kuruha Chemical, 7200), acetone and nano silicon oxid...

Embodiment 2

[0040] This example is used to illustrate the lithium ion battery provided by the present invention and its preparation method.

[0041] Prepare lithium-ion battery in the same manner as in Example 1, the difference is that step 3 is:

[0042] Polystyrene (weight average molecular weight is 100000), ethyl acetate, nano-alumina (Al 2 o 3 , the average diameter of the particles is 500 nanometers) mixed according to the weight ratio of 12:80:8, stirred evenly with a magnetic stirrer at 40°C, and prepared into an insulating coating. After the positive and negative pole pieces are tapped, apply the above insulating coating on the figure 1 4a-4d shown as well as figure 2 In the positions shown 8a and 8b, the coating is formed after the solvent evaporates. Wherein, the lug width of the positive and negative poles is 4 mm, the thickness of the coating 4a is 25 microns, and the width is 6 mm, the thickness of the coating 4b is 25 microns, and the width is 6 mm, and the thickness o...

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
melting pointaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a lithium ion battery and a preparation method thereof. Insulating coating layers are arranged in at least the following areas of the battery: 1. an area which is on the other surface of a positive plate and corresponds to an area in which a positive pole tab is jointed with a positive pole current collector; and 2. an area which is on the other surface of a negative pole tab and corresponds to an area in which the negative pole tab is jointed with a negative pole current collector, and an area which is on the other surface of a negative plate and corresponds to an areain which the negative pole tab is jointed with the negative pole current collector. Through using the insulating coating layers to substitute for adhesive tapes, the invention has the advantages thatthe high-temperature safety of the battery is improved, and the initial capacity of the battery can be improved because the insulating coating layers have certain ability of passing lithium ions.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] With its high specific energy, high voltage, small size, light weight, and no memory, lithium-ion secondary batteries have achieved tremendous development in the past ten years and have become one of the main energy sources for communication electronic products. [0003] In the production process of lithium-ion batteries, some burrs will be formed on the edge and surface after the positive electrode material and negative electrode material are solidified, especially the burrs at the edge can easily scratch the separator, resulting in an internal short circuit of the battery. In addition, since the connection between the positive and negative pole pieces and the tabs is thicker than other parts of the pole piece, this part is also easy to damage the separator and cause an internal short circuit of the battery. Therefore, in order to prevent th...

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 Patents(China)
IPC IPC(8): H01M10/36H01M10/40H01M4/02H01M2/26H01M10/42H01M2/34H01M10/38H01M4/04H01M50/531H01M50/593
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 丁平涂佩尤胜萍潘福中
Owner BYD 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