Flexible battery

Abstract

The invention relates to a flexible battery, wherein an electrochemical reaction structure body is directly adhered to the inner surface of a packaging structure body through polymers with an amide group, an imine group and a carbonyl group; and therefore, compared with the existing polymer system taking linear polymers as main components, a current collecting layer in the electrochemical reactionstructure body and the packaging structure body disclosed in the invention has higher adhesive force; in addition, the current collecting layer of the invention is a part of the packaging structure body, so that a chemical bonding is adopted between the electrochemical reaction structure body and the packaging structure body instead of a general physical fixation mode, such as vacuum coating, andtherefore the structure bodies are not easy to separate from each other after the battery is bent, thereby improving the structure stability and the safety of the battery.

Description

technical field [0001] The invention relates to a flexible battery, in particular to a flexible battery that can avoid the separation of the electrochemical reaction structure and the packaging structure caused by bending. Background technique [0002] Recently, a variety of electronic devices have emerged accordingly. In order to make this electronic device more in line with the trend of light and thin, the space allocation in the electronic device has become an important issue, and the flexible battery that can be placed on a non-planar surface brings new challenges to this issue. One of the solution strategies. However, during the bending process, once the electrochemical reaction layer and the collector layer are peeled off, it will cause damage to the battery structure and cause safety issues. [0003] As far as the characteristics of the battery are concerned, if there is better adhesion between the active material layer and the current collector layer, the moving dis...

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Problems solved by technology

[0004] As mentioned above, at present, polyvinylidenefluoride (PVDF), polyvinylidene fluoride-co-trichloroethylene (PVDF-HFP), styrene butadiene rubber (styrene-butadiene) are commonly used in general lithium batteries. ; SBR) and other adhesives with high flexibility, these adhesives are linear in structure, so they can provide quite good adhesive effects in the XY axis, but the adhesives described above are heat-treated or pressed. Its polymer chain will undergo crystallization reaction due to the influence of heat energy and pressure. In other words, the interface between the active material layer and the current collector layer added with the above-mentioned adhesive will be crystallized after heat treatment or pressing treatment. In addition, because the structure or crystalline structure of the adhesive itself is damaged by external force, it will reduce the adhesive ability to the active material, which will make the polar layer prone to cracks after drying, and even the active material layer. The situation of separation from the collector layer will eventually lead to a decrease in electronic conductivity, which will not only cause the deterioration of the electrical efficiency of the battery, but also seriously affect the safety of the battery

On the other hand, if an adhesive with a three-dimensional structure such as epoxy resin (Epoxy), acrylic resin (Acrylic Acid), polyacrylonitrile (polyacrylonitrile; PAN) is completely used, although the effect of adhesion can be improved, but because of the polymer itself The three-dimensional structure leads to the problems of high rigidity and insufficient flexibility, and it is difficult to meet the requirements of battery bending

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