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Square wound lithium ion battery and anode strip thereof

A lithium-ion battery and anode sheet technology, which is applied to non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc. The effect of increasing energy density, reducing redundant thickness, reducing thickness and volume

Active Publication Date: 2011-09-21
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above design method does not take into account the change in the thickness ratio of the cathode and anode membranes caused by the different deformation of the double-membrane sheet when the cathode and anode sheets are wound, so that the designed battery is either safe because the thickness ratio of the cathode and anode membranes does not meet the standard. Poor performance, or the energy density is not high due to the redundant thickness of the cathode and anode membranes

Method used

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  • Square wound lithium ion battery and anode strip thereof
  • Square wound lithium ion battery and anode strip thereof
  • Square wound lithium ion battery and anode strip thereof

Examples

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Embodiment 1

[0039] Example 1: For a wound square battery with 10 layers in the thickness direction, after adopting the optimized design of the thickness of the anode membrane of the present invention, the thickness of the outer anode membrane remains unchanged, and the thickness of the inner anode membrane is reduced to 96% of the thickness of the outer membrane. %, the thickness of each layer of membrane is reduced by 4%. According to the calculation of the thickness of a single membrane sheet of 0.070 mm, 10 layers will reduce the design thickness by 10*0.070*4%=0.028 mm, which has won valuable space for the thickness direction of the cell.

Embodiment 2

[0040]Example 2: For a wound square battery with 20 layers in the thickness direction, after adopting the optimized design of the thickness of the anode membrane of the present invention, the thickness of the outer anode membrane remains unchanged, and the thickness of the inner anode membrane is reduced to 96% of the thickness of the outer membrane. %, the thickness of each layer of membrane is reduced by 4%. According to the calculation of the thickness of a single membrane sheet of 0.075mm, 20 layers will reduce the design thickness by 20*0.075*4%=0.060 mm, which has won valuable space for the thickness direction of the cell.

[0041] In summary, the wound square lithium-ion battery of the present invention reduces the redundant thickness of the anode diaphragm by reducing the thickness of the inner anode diaphragm, and realizes effective reduction without affecting the safety performance and capacity of the battery cell. The thickness and volume of the battery core are redu...

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Abstract

The invention discloses a square wound lithium ion battery comprising an anode strip and a cathode strip which are superposed and wound, wherein the anode strip comprises an anode current collector and anode diaphragms coated on two faces of the anode current collector, and during winding, the thickness d2 of the anode diaphragm positioned at the inner side is smaller than the thickness d1 of the anode diaphragm positioned at the outer side. Compared with the prior art, the square wound lithium ion battery has the advantage that the redundant thicknesses of the anode diaphragms is reduced by carrying out differentiation design on the thicknesses of the two layers of anode diaphragms, and thus, the thickness and the volume of a battery core are effectively reduced and the energy density of the square wound lithium ion battery is increased on the premise of not influencing the safety performance and the capacity of the battery core.

Description

technical field [0001] The invention relates to a coiled lithium ion battery, in particular to a coiled square lithium ion battery with high energy density. Background technique [0002] Since the development of lithium-ion batteries in the 1990s, due to their advantages such as higher energy density and good cycle life, they have developed very rapidly in just over ten years. [0003] The battery core of the wound square lithium-ion battery is formed by winding the anode sheet, cathode sheet and separator through lamination sheets. When designing a lithium-ion battery, the coating thickness of the anode sheet and the cathode sheet must reach a certain ratio to ensure the safety of the battery. This ratio is called the power balance value. Existing lithium-ion batteries use double-sided equal-thickness coatings for the anode and cathode, and ensure the safety of the cell design by specifying the ratio of the thickness of the anode membrane to the thickness of the cathode me...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M4/13
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 张正德李建
Owner DONGGUAN AMPEREX TECH
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