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Wound prismatic lithium-ion battery and its anode sheet

A lithium-ion battery and anode sheet technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve the problems of cathode and anode membrane redundancy, low thickness energy density, poor safety, etc., to achieve The effect of increasing energy density, reducing thickness and volume, and reducing redundant thickness

Active Publication Date: 2016-08-03
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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  • Wound prismatic lithium-ion battery and its anode sheet
  • Wound prismatic lithium-ion battery and its anode sheet
  • Wound prismatic lithium-ion battery and its anode sheet

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 0.070mm, 10 layers will reduce the design thickness by 10*0.070*4%=0.028mm, which has won valuable space for the thickness direction of the battery 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%=0.060mm, which has won valuable space for the thickness direction of the battery 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 ar...

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Abstract

The invention discloses a wound square lithium-ion battery, which comprises an anode sheet and a cathode sheet wound superimposedly. The anode sheet includes an anode current collector and an anode diaphragm coated on both sides of the anode current collector. The thickness d2 of the anode membrane is smaller than the thickness d1 of the anode membrane located on the outer side during winding. Compared with the prior art, the winding square lithium-ion battery of the present invention reduces the redundant thickness of the anode diaphragm by differentially designing the thickness of the two-layer anode diaphragm, thus achieving a battery without affecting the safety performance and capacity of the cell Under the premise, the thickness and volume of the battery core can be effectively reduced, and the energy density of the wound square lithium-ion battery can be improved.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M4/13
CPCY02E60/10Y02P70/50
Inventor 张正德李建
Owner DONGGUAN AMPEREX TECH
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