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Electrode assembly

A technology of electrode components and positive electrodes, which is applied in the field of electrode components on fire, can solve the problems of thermal stability reduction, thermal stability deterioration, and ignition, and achieve the effect of improving thermal stability and reducing charging rate

Pending Publication Date: 2020-12-04
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the NCM-based secondary battery has a problem that when the nickel content is relatively increased, the capacity is increased, but the thermal stability is decreased, and thus, the possibility of ignition is also increased
[0010] In addition, it is known that the use of positive active materials with a relatively high content of nickel tends to catch fire at lower temperatures (thermal stability worsens as the content of nickel increases)

Method used

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Effect test

no. 1 approach

[0036] As described above, the electrode assembly according to the present invention includes the shrink film 31 that shrinks in area at a certain temperature or higher. In the present embodiment, a shrink film 31 is provided instead of the diaphragm 30 at each of the uppermost side and the lowermost side of the positions where the diaphragm 30 is provided.

[0037] Such as figure 2 as shown, figure 2 A side view is shown of an electrode assembly according to the present invention, in which a shrink film 31 is provided instead of the separator 30 at each of the uppermost side and the lowermost side of positions where the separator 30 is provided, the shrink film 31 Instead of the separator 30 being stacked at at least one or more positions between the positive electrode 10 and the negative electrode 20 , a shrink film 31 is provided at the stacked position of the separator disposed at the outermost side.

[0038]The shrink film 31 may be configured to separate the cathode ...

no. 2 approach

[0050] As described in the first embodiment of the present invention, the shrink film 31 may be stacked only at the position in contact with the single-sided positive electrode 10 ′, and may also be stacked on the positive electrode current collector 10 a in addition to the position in contact with the single-sided positive electrode 10 ′. One or more positions between the double-sided positive electrode 10 coated with positive electrode active material 10b on both surfaces of the negative electrode current collector 20 and the double-sided negative electrode 20 coated with negative electrode active material 20b on both surfaces of place. Alternatively, the shrink film 31 may be stacked only between the double-sided positive electrode 10 and the double-sided negative electrode 20, except for a position contacting the single-sided positive electrode 10'.

[0051] refer to Figure 4 , Figure 4 The state where the shrink film 31 is additionally stacked in addition to the posit...

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Abstract

The present invention relates to an electrode assembly in which a cathode, a separator, and an anode are repeatedly stacked, wherein the electrode assembly comprises a shrink film which is made of a material having a higher thermal shrinkage than the separator and of which the area shrinks above a certain temperature, and in one or more places between the cathode and the anode, the shrink film isstacked instead of the separator such that when the shrink film shrinks due to an increase in temperature, the cathode and the anode, which are adjacent to each other with the shrink film therebetween, partially come into contact with each other so as to generate a microcurrent. The present invention having the above technical features can increase thermal stability by lowering a filling rate of the electrode assembly by allowing the flow of the microcurrent when high heat is generated due to thermal runaway or due to external factors of a cathode material.

Description

technical field [0001] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0020424 filed on February 21, 2019, the entire contents of which are hereby incorporated by reference. [0002] The present invention relates to an electrode assembly in which a negative electrode, a separator, and a positive electrode are repeatedly stacked, and more particularly, to an electrode assembly capable of preventing ignition due to thermal runaway from occurring. Background technique [0003] Batteries that store electrical energy can generally be classified into primary batteries and secondary batteries. A primary battery is a one-time consumption battery. On the other hand, a secondary battery is a rechargeable battery manufactured by using a material capable of repeating an electric current and oxidation and reduction processes between materials. That is, charging is performed when a reduction reaction to a material is performed by an electric cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/42H01M4/131H01M4/525H01M10/052
CPCH01M10/052H01M10/42H01M10/0585H01M4/131Y02E60/10Y02P70/50H01M50/489H01M50/581H01M2300/0068H01M4/525H01M10/4235H01M4/505H01M2004/027H01M2004/028
Inventor 崔志贤李汉荣
Owner LG ENERGY SOLUTION LTD
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