Secondary battery having structure in which unit cells which become thinner in one direction are radially assembled, and device comprising same

A secondary battery and cell technology, which is applied in secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve problems such as the reduction of ion conductivity, achieve the effect of improving battery performance and reducing concentration changes

Pending Publication Date: 2021-11-30
LG ENERGY SOLUTION LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the case of lithium secondary batteries, lithium ions in the electrolyte solution generally exhibit high ion conductivity within a specific concentration range, and the ion conductivity decreases when the concentration is thinner or thicker than this concentration

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
  • Secondary battery having structure in which unit cells which become thinner in one direction are radially assembled, and device comprising same
  • Secondary battery having structure in which unit cells which become thinner in one direction are radially assembled, and device comprising same
  • Secondary battery having structure in which unit cells which become thinner in one direction are radially assembled, and device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] With 100 parts by weight of NCM (LiNi 0.8 co 0.1 mn 0.1 o 2 ), 1.5 parts by weight of carbon black (FX35, Denka) as a conductive material and 2.3 parts by weight of polyvinylidene fluoride (KF9700, Kureha) as a binder polymer were added to NMP (N-methyl-2- pyrrolidone), thereby preparing the positive electrode mixture layer slurry. The positive electrode mixture layer slurry is 640mg / 25cm 2 The loading amount of was coated on the aluminum current collector having through-holes in the thickness direction, and then vacuum-dried to obtain a positive electrode. In the aluminum current collector, the formation area ratio of through holes is about 40%, and about 50 holes are formed per unit area of ​​10 cm×10 cm. In addition, the positive electrode mixture layer was pressed to gradually decrease to a thickness of about 40% in one direction.

[0054] 100 parts by weight of artificial graphite (GT, Zichen (China)) as the negative electrode active material, 1.1 parts by we...

Embodiment 2

[0062] A secondary battery was fabricated in the same manner as in Example 1 except that current collectors having a grid structure were used for the aluminum and copper current collectors, respectively.

experiment example 1

[0067] Experimental example 1: Evaluation of the properties of the secondary battery

[0068] The physical properties of each of the secondary batteries prepared in Example 1 and Comparative Example 1 were evaluated. Specifically, each secondary battery was charged and discharged, and voltage and temperature changes during charging and discharging were measured, respectively. Charging and discharging of the secondary battery were performed at 20°C and 1C.

[0069] Figure 4 The evaluation results of the voltage change during charging and discharging of the secondary battery are shown in , Figure 5 The evaluation results of temperature changes during charge and discharge of the secondary battery are shown in .

[0070] First, see Figure 4 , it can be seen that the secondary battery of Example 1 has a high discharge voltage and a low charge voltage compared with Comparative Example 1. From this, it can be seen that the secondary battery of Example 1 provides higher power ...

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

No PUM Login to view more

Abstract

The present invention provides a secondary battery having a novel structure in which unit cells which become thinner in one direction are radially assembled, and a device comprising the same. When a collector having a through-hole in the thickness direction is to be applied, the variation range of the concentration of an electrolyte in the battery is reduced, helping to improve the performance of the battery.

Description

technical field [0001] The present invention relates to a secondary battery including a structure in which unit cells whose thickness decreases in one direction are assembled radially, and an apparatus including the same. [0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0133561 filed on October 25, 2019, the entire contents of which are incorporated herein by reference. Background technique [0003] With the depletion of fossil fuels leading to higher energy prices and increased concerns over environmental pollution, there is an increasing need for environmentally friendly alternatives. In particular, the demand for secondary batteries as energy sources is rapidly increasing with the technological development and increase in demand for mobile devices. As demands for secondary batteries diversify and increase, new types of secondary batteries are required. [0004] In addition, in the case of a lithium secondary battery...

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): H01M50/207H01M50/258H01M50/249H01M4/74H01M10/052
CPCH01M50/207H01M50/258H01M50/249H01M4/745H01M10/052H01M10/04Y02E60/10Y02P70/50H01M2004/025H01M2004/021H01M4/74H01M4/80H01M10/0463H01M4/661H01M2220/10H01M2220/20H01M2220/30
Inventor 高约翰李正鲁朴钟弼
Owner LG ENERGY SOLUTION LTD
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