CN202957152U - Mixed type super capacitor bank - Google Patents

Abstract

A hybrid supercapacitor group consisting of an activated carbon negative electrode, a diaphragm, an organic electrolyte, a lithium iron phosphate positive electrode, a graphite negative electrode, a shell, and a wire; the activated carbon negative electrode, lithium iron phosphate positive electrode, and graphite negative electrode are placed in sequence from left to right In the casing, the organic electrolyte is arranged between the negative electrode of activated carbon and the positive electrode of lithium iron phosphate and between the positive electrode of lithium iron phosphate and the negative electrode of graphite through the diaphragm, and the wires are respectively connected to the negative electrode of activated carbon, the positive electrode of lithium iron phosphate and the graphite on the negative pole. Its advantages are: the hybrid supercapacitor and lithium-ion battery are organically combined into a whole, so that under the premise of ensuring a certain power characteristic, the energy density of the supercapacitor can be greatly improved, and the discharge demand of different electrical appliances can be guaranteed.

Description

Hybrid Supercapacitor Bank

technical field

The utility model relates to a novel structure of a supercapacitor, in particular to a hybrid supercapacitor group composed of a supercapacitor and a lithium ion battery.

Background technique

A supercapacitor is a new type of energy storage element between a traditional capacitor and a secondary battery. It stores energy through a polarized electrolyte, but no chemical reaction occurs during the energy storage process. This energy storage process is reversible. It is precisely because of this supercapacitor that it can be repeatedly charged and discharged hundreds of thousands of times. A supercapacitor can be regarded as two non-reactive porous electrode plates suspended in the electrolyte. When electricity is applied to the plates, the positive plate attracts negative ions in the electrolyte, and the negative plate attracts positive ions, actually forming two capacitive storage layer, the separated positive ions are near the negative plate, and the negative ions are near the positive plate. It has the characteristics of short charging time, long service life, good temperature characteristics, energy saving and environmental protection. It has a wide range of applications in the fields of smart meters, electric vehicles, and wind power generation, and has attracted much attention in recent years.

Compared with traditional secondary batteries, supercapacitors have the characteristics of long life and high power density, but lower energy density. At present, many research works are devoted to improving the energy density of the supercapacitor system. An effective way is to apply a hybrid supercapacitor system, that is, one electrode uses an electrode activated carbon electrode, and the other electrode uses a pseudocapacitive electrode material or a battery electrode material. By increasing the working voltage of the capacitor, the energy density of the capacitor is increased. The work aimed at improving the energy density of hybrid supercapacitors mainly focuses on the use of redox active materials and activated carbon to form asymmetric supercapacitors, such as activated carbon/graphite, activated carbon/metal oxide and activated carbon/polymer hybrid supercapacitors. In recent years, lithium-ion intercalation compounds and carbon materials for lithium-ion batteries have received widespread attention as positive electrode materials for hybrid supercapacitors, where lithium-ion battery electrode materials are used as positive electrodes and activated carbon is used as negative electrodes for hybrid supercapacitors. Compared with activated carbon/activated carbon electric double layer capacitors, the above-mentioned hybrid supercapacitors can be improved to a certain extent in terms of energy density, but they still cannot meet the actual needs of some electrical appliances.

Contents of the invention

The utility model is to overcome the problem of low energy density of the supercapacitor in the working process, and proposes a hybrid supercapacitor bank, which organically combines the hybrid supercapacitor and lithium-ion battery into a whole, so that a certain power characteristic can be guaranteed Under the premise, the energy density of supercapacitors can be greatly increased to provide protection for the discharge needs of different electrical appliances.

The hybrid supercapacitor group involved in the utility model is characterized in that it is composed of an activated carbon negative electrode 1, a diaphragm 2, an organic electrolyte 3, a lithium iron phosphate positive electrode 4, a graphite negative electrode 5, a casing 6 and a wire 7. The activated carbon negative electrode 1, the lithium iron phosphate positive electrode 4, and the graphite negative electrode 5 are sequentially placed in the casing 6 from left to right, and the organic electrolyte 3 is arranged between the activated carbon negative electrode 1 and the lithium iron phosphate positive electrode 4 through the diaphragm 2, and the phosphoric acid Between the lithium iron positive electrode 4 and the graphite negative electrode 5 , the wires 7 are respectively connected to the activated carbon negative electrode 1 , the lithium iron phosphate positive electrode 4 and the graphite negative electrode 5 .

In the utility model, the battery is designed as three parts of an activated carbon electrode, a lithium iron phosphate electrode and a graphite electrode, wherein the lithium iron phosphate electrode is a common part of the supercapacitor. During the working process of this hybrid supercapacitor bank, it can combine the characteristics of high energy density of lithium-ion battery and good power characteristics of supercapacitor, so that the capacitor bank has better energy density under the premise of ensuring certain power characteristics. It can work continuously according to the different power demands of electrical appliances.

Description of drawings

Fig. 1 is a structural representation of the utility model.

In the figure: activated carbon negative electrode 1, separator 2, organic electrolyte 3, lithium iron phosphate positive electrode 4, graphite negative electrode 5, casing 6, and wire 7.

Detailed ways

As shown in the figure, the hybrid supercapacitor group consists of an activated carbon negative electrode 1, a diaphragm 2, an organic electrolyte 3, a lithium iron phosphate positive electrode 4, a graphite negative electrode 5, a casing 6 and a wire 7. The activated carbon negative electrode 1, iron phosphate The lithium positive electrode 4 and the graphite negative electrode 5 are placed in the housing 6 in turn from left to right, and the organic electrolyte 3 is arranged between the activated carbon negative electrode 1 and the lithium iron phosphate positive electrode 4 and between the lithium iron phosphate positive electrode 4 and the graphite through the diaphragm 2. Between the negative electrodes 5, the wires 7 are respectively connected to the activated carbon negative electrode 1, the lithium iron phosphate positive electrode 4 and the graphite negative electrode 5.

Working principle: When the lithium ion battery composed of lithium iron phosphate positive electrode 4 and graphite negative electrode 5 works, it has a high energy density, and when the supercapacitor composed of activated carbon negative electrode 1 and lithium iron phosphate positive electrode 4 works, it has high energy density. Power characteristics. The hybrid supercapacitor bank effectively combines the two through the shared lithium iron phosphate positive electrode. It not only has a simple structure, but also has high energy density and power characteristics, providing protection for the discharge needs of different electrical appliances.

Claims (1)

1. A hybrid supercapacitor bank is characterized in that: it is made up of activated carbon negative pole, diaphragm, organic electrolyte, lithium iron phosphate positive pole, graphite negative pole, shell and lead; Described activated carbon negative pole, lithium iron phosphate positive pole, graphite negative pole Placed in the housing in turn from left to right, the organic electrolyte is set between the negative electrode of activated carbon and the positive electrode of lithium iron phosphate and between the positive electrode of lithium iron phosphate and the negative electrode of graphite through the diaphragm, and the wires are respectively connected to the negative electrode of activated carbon, Lithium iron phosphate positive electrode and graphite negative electrode.

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