Lithium ion battery-super capacitor mixed energy storage optical voltage system

A technology for supercapacitors and lithium-ion batteries, applied in battery circuit devices, current collectors, electrochemical generators, etc., can solve the problems of low energy density and large lead-acid batteries, and achieve high power, high power density, delay effects of aging

Inactive Publication Date: 2008-04-30
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the lead-acid battery in the existing lead-acid battery and supercapacitor hybrid energy storage technology that the lead-acid battery is lar...

Method used

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  • Lithium ion battery-super capacitor mixed energy storage optical voltage system

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Embodiment Construction

[0025]Figure 1 is a schematic diagram of a photovoltaic system using lithium-ion battery-supercapacitor hybrid energy storage. As shown in FIG. 1 , the present invention includes a photovoltaic cell 1 , an energy management circuit 2 , a lithium ion battery 3 , a supercapacitor 4 and an electrical load 5 . Photovoltaic cell 1 serves as the energy source of the energy system. Lithium-ion battery 3 and supercapacitor 4 are used in combination as an energy storage system. The energy management circuit 2 optimizes intelligent management for the different characteristics of the lithium-ion battery 3 and the supercapacitor 4 , so that the advantages of the lithium-ion battery 3 and the supercapacitor 4 complement each other. The energy management circuit 2 includes a charging management circuit, a discharging management circuit, a voltage stabilizing circuit and interfaces of various devices, as shown in FIG. 2 . Photovoltaic battery 1 , lithium ion battery 3 , supercapacitor 4 an...

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Abstract

A mixed energy storage photovoltaic system for a lithium-ion cell- a super-capacitor is provided, a photovoltaic cell (1) is an energy source of an energy resource system, the lithium-ion cell (3) and the super-capacitor (4) are combined to be used as an accumulation system, and an energy management circuit (2) intelligently controls the energy resource system and the accumulation system to supply power for a load (5). During initial charging, the super-capacitor (4) terminal voltage is relatively low, and the photovoltaic cell (1) firstly charges the super-capacitor (4); when the super-capacitor (4) is fully charged, the lithium-ion cell (3) is charged; when being no sunshine, the photovoltaic cell (1) has no power output, when the load (5) needs the electricity, the super-capacitor (4) supplies power for the load (5); when the electric quantity of the super-capacitor (4) is insufficient, the lithium-ion cell (3) supplies power for the load through the energy management circuit (2), and supplements electric quantity for the super-capacitor (4). The invention has long service life, high capacity, as well as high output power.

Description

technical field [0001] The invention relates to a hybrid energy storage photovoltaic system using lithium ion batteries and supercapacitors in combination. Background technique [0002] Lithium-ion batteries were developed in the early 1990s and have developed rapidly in the past 10 years. Compared with other types of storage batteries, lithium-ion batteries have outstanding advantages such as high monomer voltage, high energy density, low self-discharge rate, and no memory effect. Lithium-ion batteries are by far the most energy-dense type of energy storage device. However, the cycle life of lithium-ion batteries is limited, generally 500-1000 times, and the charge-discharge rate of general lithium-ion batteries is only 0.2C-1C. [0003] Supercapacitors entered commercial scale in the 1980s. Compared with traditional capacitors, the energy density of supercapacitors is 3 to 4 orders of magnitude larger, while maintaining the characteristics of extremely fast energy relea...

Claims

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Application Information

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IPC IPC(8): H01M16/00H02J7/00
CPCY02E60/10
Inventor 于红云李艳秋尚永红苏波
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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