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Stack-folding type electrode assembly and manufacturing method therefor

An electrode assembly and folding technology, which is applied in secondary battery manufacturing, secondary batteries, small flat batteries/batteries, etc., can solve the problems of electrode active material detachment, low design freedom, low space utilization, etc., and achieve folding Effects of reduced size tolerance and defect ratio, increased degrees of freedom, and freedom in cell design

Active Publication Date: 2016-03-02
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gel roll electrode assemblies are suitable for cylindrical batteries, but when applied to prismatic batteries or pouch batteries, there are drawbacks such as detachment of electrode active materials and low space utilization
[0015] Conventionally, as mentioned above, battery design involves increasing the number of electrodes by 6 as the number of stacks increases, so there is a limit to changing the number of stacks for battery performance (e.g., thickness, capacity, or resistance), resulting in low design freedom

Method used

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  • Stack-folding type electrode assembly and manufacturing method therefor
  • Stack-folding type electrode assembly and manufacturing method therefor
  • Stack-folding type electrode assembly and manufacturing method therefor

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Embodiment Construction

[0052] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in this specification and the appended claims should not be interpreted as limited to the general dictionary meaning, but should be interpreted based on the meaning and concept corresponding to the technical aspect of the present disclosure, which is Based on the principle that the inventors are allowed to properly define terms for best interpretation.

[0053] It should also be understood that battery packs or electrode assemblies encompassed by the present disclosure include all types without being limited to specific types, for example, those having a plurality of stacked unit cells wound with folded separator sheets cut into an elongated shape A stacked-folded electrode assembly and a Z-shaped stacked electrode assembly having stacked single cells wound by folding in ...

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Abstract

Provided are a stack-folding type electrode assembly and a manufacturing method therefor that can reduce the number of foldings and can achieve high efficiency in manufacturing a battery and a high degree of freedom of design. The stack-folding type electrode assembly, according to the present invention, is an electrode assembly that has a structure in which a plurality of stack type unit cells are overlaid with each other and a continuous folding separation membrane sheet is interposed between the overlaid parts, wherein the unit cells correspond to a combination of more than two quad cells and one C type bi-cell, each quad cell having a structure of a positive electrode / a separation membrane / a negative electrode / a separation membrane / a positive electrode / a separation membrane / a negative electrode and the C type bi-cell having a structure of a negative electrode / a separation membrane / a positive electrode / a separation membrane / a negative electrode; and the quad cell is located at the central portion where winding starts so that the unit cells located above and below the central portion have an asymmetric structure, or the C type bi-cell is located at the central portion where the winding starts so that the unit cells located above and below the central portion have a symmetric structure.

Description

technical field [0001] The present disclosure relates to a stack-fold type electrode assembly, a secondary battery pack, and a method of manufacturing the stack-fold type electrode assembly, and more particularly, to a stack-fold type electrode assembly having a reduced number of folds and a method of manufacturing the same. [0002] This application claims priority from Korean Patent Application No. 10-2014-0105263 filed in Korea on Aug. 13, 2014 and Korean Patent Application No. 10-2014-0105264 filed in Korea on Aug. 13, 2014, said The disclosure of the Korean patent application is incorporated herein by reference. Background technique [0003] As technology develops and demand for mobile devices increases, demand for secondary battery packs is also sharply increasing, and in particular, lithium secondary battery packs having high energy density and high operating voltage as well as good storage characteristics and lifespan characteristics It is widely used as an energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04
CPCH01M10/0436H01M10/045H01M10/0413H01M10/0459H01M10/049H01M10/052H01M10/0585H01M2220/20Y02E60/10Y02P70/50
Inventor 崔正锡金志贤李在宪
Owner LG ENERGY SOLUTION LTD
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