Preparation method of flexible battery pack and prepared flexible battery pack

Abstract

The invention discloses a preparation method of a flexible battery pack, and relates to the technical field of battery preparation. The preparation method comprises the following steps: (1) carrying out first packaging on a roll core or a laminated core by adopting an aluminum-plastic film, injecting an electrolyte, and carrying out second packaging after formation, so as to prepare a single battery cell; (2) connecting the single battery cells prepared in the step (1) in parallel, in series or in series and in parallel to form a battery pack; (3) putting the battery pack in the step (2) intoa mold, and injecting a packaging material; after the packaging material is polymerized, obtaining the flexible battery pack, wherein the mold comprises a flexible carrier and a flexible cover plate,the flexible carrier is provided with a groove for accommodating the battery pack, and the flexible cover plate covers the groove. The invention also provides a battery prepared by the preparation method. The method and the battery have the beneficial effects that the flexible carrier is independently processed, and therefore the safety problem of the battery pack due to the fact that the weight of the battery sinks to the bottom and the distribution of the battery is not uniform when the flexible carrier and the battery pack are integrally formed is solved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a method for preparing a flexible battery pack and the prepared flexible battery pack. Background technique [0002] With the continuous development of electronic technology, electronic components play an increasingly important role in human life, and electronic equipment is tending to develop in the direction of thin, light, compact and intelligent. Flexible devices are gradually becoming an emerging force in the direction of thin, light, compact, and intelligent, such as flexible screens, flexible mobile phones, flexible watches, and so on. The realization of flexible devices is more and more urgent for the emergence of flexible and bendable energy storage devices. [0003] Batteries currently on the market are generally packaged in four packaging methods: cylindrical, square, button and soft. Among these four methods, the batteries prepared by cylindrical, square...

AI Technical Summary

Problems solved by technology

[0004] However, the flexible batteries in the prior art have the following disadvantages: 1. The capacity of the battery is generally below 100mAh due to the size limitation; 2. The performance of the battery will decay after repeated bending and folding, and the contact between the positive and negative materials of the battery will become weak after folding. 3. It will cause safety problems. Since the positive and negative materials of the battery are coated on the metal foil, the positive and negative electrodes of the battery will be bent and folded many times. The electrode material will fall off from the copper foil or aluminum foil, piercing the separator and causing a short circuit of the battery, which will cause safety problems; 4. The separator of the battery is a porous organic matter. After the battery is bent and folded many times, the separator may be damaged, resulting in positive and negative electrodes. Contact short circuit creates safety issues

[0005] In the prior art, there is also a method of assembling small battery packs into battery packs, and then using flexible materials to package the battery packs, but the use of flexible materials to pack batteries has the following disadvantages: First, when using chemical polymer materials for integral packaging , the battery pack will sink into the bottom of the packaging material due to its own weight, causing the battery pack to be exposed to the outside of the packaging material, which will easily cause safety problems; Continuous adjustment during production, resulting in complex preparation process and low effective efficiency

Third, in the case of integrated packaging, due to the low hardness of the material used, a thicker packaging layer is required, which reduces the energy density of the battery; Above, prolonged exposure to high temperature will cause irreversible performance degradation of the battery, resulting in battery bulge failure

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