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A three-layer flexible battery structure and preparation method
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A flexible battery and battery technology, applied in secondary battery manufacturing, small flat battery/battery, climate sustainability, etc., can solve the problems of reduced ductility, achieve high ductility, increase capacity per unit area, and battery coverage maximized effect
Active Publication Date: 2019-09-06
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology
Constructing a network of interconnected islands is an effective way to make flexible batteries highly extensible; increasing the area of the islands, that is, increasing the battery coverage, is conducive to the greater capacity per unit area of flexible batteries, but at the same time it is also It will cause a decrease in ductility; the flexible battery constructed with a platform-like substrate can achieve a battery coverage of 70% while ensuring stretchability; the self-similar structure design makes lithium-ion batteries have great ductility and flexibility. High battery coverage is maintained, but these designs still cannot maximize battery coverage
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Embodiment 1
[0026] Embodiment 1: see Figure 1 to Figure 4 , a three-layer flexible battery structure, which includes a flexible substrate 1, an island bridge structure 2, and a battery 3;
[0027] The flexible substrate 1 is a flexible insulating material that can be stretched in all directions;
[0028] The island bridge structure 2 is placed on the flexible substrate 1; the island bridge structure 2 includes a conductive small cylinder 21 and a copper wire 22; the copper wire 22 connects the conductive small cylinder 21 in parallel; the conductive small cylinder The distance between 21 is the same as the distance between the terminals of the two batteries 3;
[0029] The batteries 3 and the small conductive cylinders 21 of the island bridge structure 2 are pasted together with conductive silver glue; the batteries 3 correspond to the small conductive cylinders 21 one by one, and are closely arranged to cover the entire base.
[0030] Furthermore, the flexible substrate 1 is made of E...
Embodiment 2
[0033] Embodiment 2, a method for preparing a three-layer flexible battery structure, comprising the following steps:
[0034] A. Prepare PI film by spin coating method;
[0035] B. Evaporate a layer of copper foil on the surface of the PI film, and photoetch the copper foil to form an island bridge shape;
[0036] C. Hot-press a layer of PI film on the formed island bridge-shaped copper foil, and then dry-etch the newly hot-pressed PI film on the conductive small cylindrical area to expose the copper island;
[0037] D. Use laser cutting to make the PI film form the same shape as the copper island bridge structure, and make the PI film slightly wider than the copper foil to obtain the entire island bridge structure;
[0038] E. Repeat steps A-D to make the second layer of island bridge structure;
[0039] F. The first layer of the island bridge structure is all glued to the stretchable substrate on one side of the PI film;
[0040] G. Use conductive glue to bond the positi...
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Abstract
The invention discloses a three-layer flexible battery structure, which comprises a flexible base (1), an island bridge structure (2) and a battery (3). In the present invention, the battery and wires on the flexible substrate are designed as a three-layer structure, the middle layer is a closely arranged battery array, the upper and lower sides of the battery are conductive small cylinders and copper wires that connect them in parallel, and they respectively lead out the positive pole and the copper wire of the battery. Negative electrode, each small cylinder corresponds to the square battery part that is co-centered with it, and the batteries are closely arranged to cover the entire substrate. area capacity.
Description
technical field [0001] The invention belongs to the technical field of flexible battery manufacturing, and in particular relates to a three-layer flexible battery structure and a preparation method. Background technique [0002] Flexible batteries can continuously power LEDs, etc., can be stretched, folded, bent, and can even be installed on the wrist to work as usual. This kind of battery can be used anywhere, including inside the human body, which means that we can implant electronic devices into the human body to monitor brain waves and heart activity signals, which cannot be done with traditional batteries. Constructing a network of interconnected islands is an effective way to make flexible batteries highly extensible; increasing the area of the islands, that is, increasing the battery coverage, is conducive to the greater capacity per unit area of flexible batteries, but at the same time it is also It will cause a decrease in ductility; the flexible battery constr...
Claims
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Application Information
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