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

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...

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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 large in volume and low in energy density and is not suitable for portable devices, and designs a lithium-ion battery and supercapacitor hybrid energy storage solution, and Use it in photovoltaic systems to power portable devices

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