Energy-storage lithium battery parallel-connection capacity-expansion circuit and energy-storage lithium battery parallel-connection capacity-expansion voltage control method

Abstract

The invention discloses an energy-storage lithium battery parallel-connection capacity-expansion circuit. The energy-storage lithium battery parallel-connection capacity-expansion circuit comprises more than two battery pack units, wherein the anode output end and the cathode output end of each battery pack unit are respectively connected in parallel; each battery pack unit internally comprises a battery pack N1 and a single chip microcomputer M1; a switch S1 and a current limiting resistor R1 are serially connected in sequence between the cathode of the battery pack N1 and a node between the cathodes of one battery pack N1 and the corresponding battery pack unit; a switch S2 is connected in parallel with two ends of a series circuit of one switch S1 and the corresponding current limiting resistor R1; one switch S1 and the corresponding switch S2 are connected with a control port of the corresponding single chip microcomputer M1 and controls the disconnection and closing work of the corresponding single chip microcomputer M1; the battery pack units are communicated and controlled by a communication bus of the single chip microcomputers. The invention also discloses an energy-storage lithium battery parallel-connection capacity-expansion method. The energy-storage lithium battery parallel-connection capacity-expansion circuit has the advantages of being large in energy storage capacity, stable in balance of initial voltage between two battery packs, simple in structure, low in cost, capable of improving the safety and the stability of the lithium battery packs; the energy-storage lithium battery parallel-connection capacity-expansion circuit has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to an energy storage lithium battery parallel expansion circuit and an energy storage lithium battery parallel expansion method. Background technique [0002] With the gradual promotion of the concept of environmental protection, lithium energy storage batteries, as a new type of environmentally friendly energy that is promoted around the world, are no longer limited to the application of power supplies for small and medium-sized mobile devices such as mobile phones, MP3, MP4, digital cameras, and notebooks, and are gradually replacing lead. Acid batteries become the power source of electric tools, electric motorcycles, electric bicycles and other tools. The country is also promoting lithium batteries to communication base stations, using high-power lithium batteries as energy storage power sources for communication base stations. At the same time, with new energy ent...

AI Technical Summary

Problems solved by technology

Since the initial voltage of each lithium battery box is not exactly the same, there will be internal circulation during parallel connection, which will affect the overall performance. Therefore, a reliable method for parallel expansion of battery boxes is needed

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