Electric energy supply system and its electric energy supply unit

Abstract

The invention discloses an electric energy supply system and an electric energy supply unit thereof. The electric energy supply system is formed by winding / stacking a plurality of electric energy supply units. Each electric energy supply unit includes a substrate, two current collecting layers, and two active materials. There are a plurality of micro-holes on the substrate, and the collector layer and the active material layer are sequentially stacked and covered on both sides of the substrate. Therefore, the conduction of ions is directly achieved through the micro-holes on the substrate, and the current is collected through the The power supply layer directly transmits and supplies the generated power to the outside; therefore, the impedance value of the power supply system itself is reduced by this new form of power supply mode, and at the same time, since the collector layers are located on both sides of the substrate, only the coating process is required. The setting of the collector layer and the isolation layer can be completed, which greatly simplifies the fabrication process of the electrode layer and the isolation layer.

Description

technical field [0001] The invention relates to an electric energy supply system and an electric energy supply unit applied to power supply of various electronic devices. Background technique [0002] As 3C products such as electronics, information and communication are all developing towards wireless and portable, various high-performance components used in various products are moving towards the goal of lightness, thinness, shortness and smallness. In recent years, flexible The technological development of electronic products has gradually been paid attention to. Therefore, the demand for power supply systems with small size, light weight and high energy density is quite urgent. However, in order to prolong the battery life and increase the energy density of the battery, the primary battery system that could not be reused in the past can no longer meet the needs of today's electronic products, and most of the battery systems currently used in electronic products are rechar...

AI Technical Summary

Problems solved by technology

[0004] However, because whether the contact interface between the isolation layer 11 and the first active material layer 12 and the second active material layer 13 has a good contact has a very direct and serious impact on the electrical properties and safety performance of the overall battery system, so The management of the interface can be said to be a key factor affecting the stability and safety of the battery system; figure 1 , the existing lithium battery comprises the first collector layer 14 and the first active material layer 12, the first active material layer 12 and the isolation layer 11, the isolation layer 11 and the second active material layer 13, and the second active material layer Layer 13 and the second collector layer 15 have four interfaces. Therefore, in order to maintain good contact with these interfaces in the existing lithium battery technology, whether it is a battery core with a stacked structure or a wound structure, the battery must be After assembly, the flexibility of the overall structure is quite low, or even impossible to bend. The reason is to avoid damage to the above-mentioned interface caused by the stress generated by the bending, so as to maintain the electrical performance of the lithium battery system and ensure its use. security

[0005] Furthermore, the negative electrode material will heat up and expand / shrink during the charging / discharging process. Once expanded, it will inevitably generate additional compressive stress to the structure on both sides. From this structure, it is assumed that the second active material layer 13 is the negative electrode material. The second active material layer 13 is sandwiched between the isolation layer 11 and the second collector layer 15, so it is limited by the isolation layer 11 and the second collector layer 15, so that the compressive stress cannot be released. It is more difficult to maintain the contact state between the interfaces after repeated expansion and contraction

In addition, the general conductive handle is made of aluminum metal. The aluminum electric handle needs to be ultrasonically welded with the nickel sheet before the positive electrode conductive handle can be tin-welded (because aluminum cannot be soldered directly), and the conductive handle needs to be extended outward. For the packaging material, its thickness is about 100~150um, and the total thickness of the upper and lower colloids of the packaging material is about 60~120um. The water vapor in the environment diffuses and pollutes the interior) and the effect of liquid resistance (the internal electrolyte overflows and corrodes the external circuit) is seriously reduced

[0006] For stacked or wound battery cells, please refer to figure 2 In the figure, the stacked structure is taken as an example. Because a single battery cell has four interfaces, the number of interfaces increases exponentially with the addition of mutual stacking; The problem of shrinkage, once one of the interfaces is not in good contact, may affect the reliability of the overall battery system

And the existence of the interface will also affect the flow and permeability of the electrolyte. The more interfaces, the more difficult it is for the filled electrolyte to penetrate the entire battery system evenly. Either it takes more time to penetrate, or it is difficult to penetrate evenly, resulting in partial battery cell efficiency. reduce

[0007] On the other hand, still as figure 2 As shown, when the battery system is formed by stacking, it is equivalent to the need to connect multiple batteries in parallel internally. The inner tabs of each battery 1 must be welded to each other first, and then welded to the single conductive handle of the two poles. Therefore, once the number of tabs increases , the yield and reliability of the overall welding project will also deteriorate

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