CN105206857B - A kind of redox flow battery energy storage system for carrying electrolyte storage chamber - Google Patents

Abstract

A flow battery energy storage system with its own electrolyte storage chamber. The entire energy storage system includes a plastic case, graphite electrodes, collector plates, diaphragms, fastening bolts, and battery electrodes. The flow battery energy storage system integrates the electrolyte storage chamber and the flow battery stack, and replaces the laminated battery stack with a long-plate single flow battery, which greatly simplifies the production process of the battery stack. During the charging process, by applying a voltage between the positive and negative electrodes of the battery, the valence state of the ions in the electrolyte changes, thereby achieving the purpose of storing energy, that is, the charging process; during discharge, the ions in the electrolyte are valenced through the potential difference between the positive and negative electrolyte storage chambers. The state changes, and the directional movement of charges produces a current output.

Description

A flow battery energy storage system with its own electrolyte storage chamber

technical field

The present invention relates to the technical field of flow batteries, and more specifically, to a flow battery energy storage system with its own electrolyte storage chamber.

Background technique

The existing flow battery energy storage system is generally composed of three parts: battery stack, circulation pump and electrolyte storage tank, with complex structure, many assembly pipelines, and high installation process requirements; The flow battery stack has high requirements for sealing and complex assembly process; the electrolyte storage tank is designed separately from the battery stack, and the electrolyte exchange between the storage tank and the battery stack needs to be realized through a circulation pump. The use of the circulation pump increases the battery system cost and process requirements.

Contents of the invention

The purpose of the present invention is to provide a flow battery energy storage system with an electrolyte storage chamber for the above-mentioned shortcomings of the existing flow battery energy storage system, which integrates the electrolyte storage chamber and the flow battery into one At the same time, the laminated battery stack is replaced by the long-plate single flow battery, which greatly simplifies the production process of the battery stack.

Its technology is realized in this way, including plastic casing, graphite electrodes, collector plates, diaphragms, fastening bolts, and battery electrodes. It is characterized in that: the entire flow battery energy storage system is sealed in two semi-rectangular plastic casings, two The semi-rectangular plastic casing is connected by a row of equally spaced fastening bolts to form a complete rectangular pipe. There are two slots on the inner side of the plastic casing near the closed end. The graphite electrodes and collector plates are fixed on the inside of the plastic casing through the slots. One end of the collector plate is led out of the plastic shell to form the battery electrode, and a selective ion exchange membrane is laid in the middle of the two halves of the rectangular plastic shell along the direction of the joint surface, and an electrolyte reaction chamber is formed between the selective ion exchange membrane and the upper and lower collector plates. An electrolyte storage chamber is formed between the plastic shell and the graphite electrode, and the graphite electrode is a porous graphite electrode, and the electrolyte in the electrolyte storage chamber and the electrolyte reaction chamber can be exchanged through the porous graphite electrode.

The current collector plate is a mesh or porous metal collector plate.

Description of drawings

Fig. 1 is a schematic diagram of the cross-sectional structure of the flow battery system of the present invention.

Fig. 2 is a schematic diagram of the longitudinal section structure of the flow battery system of the present invention.

Among them, 1-plastic shell, 2-electrolyte storage chamber, 3-graphite electrode, 4-collector plate, 5-electrolyte reaction chamber, 6-selective ion exchange membrane, 7-card slot, 8-fastening bolt , 9-battery electrode.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

A flow battery system with its own electrolyte storage chamber, including a positive electrode and a negative electrode, a separator, a positive electrode electrolyte and a negative electrode electrolyte, which contain A ⁿ⁺ /A ^(n+x)+ , B ^m+ / The solution of B ^(m+y)+ ions is used as the redox reaction electrolyte of the positive and negative poles of the battery. The positive and negative electrolytes are stored in two electrolyte storage chambers respectively, and the positive and negative electrolytes penetrate through the porous graphite electrode. Go to the reaction place (electrolyte reaction chamber) for redox to realize the charge and discharge process.

See attached drawings 1 and 2, the entire flow battery energy storage system is sealed in two semi-rectangular plastic shells 1, and the two half-rectangular plastic shells 1 are connected by a row of equally spaced fastening bolts 8 to form a complete rectangular pipe. Two card slots 7 are provided on the inner side of the plastic shell close to the closed end. The graphite electrode 3 and the collector plate 4 are fixed on the inner side of the plastic shell 1 through the card slots. One end of the collector plate 4 is led out of the plastic shell 1 to form a battery electrode 9, which is rectangular in half. A selective ion exchange membrane 6 is laid in the middle of the plastic shell 1 along the direction of the joint surface. An electrolyte reaction chamber 5 is formed between the selective ion exchange membrane 6 and the upper and lower collector plates 4. An electrolyte storage chamber 2 is formed between them, and the graphite electrode 3 is a porous graphite electrode. The electrolyte in the electrolyte storage chamber 2 and the electrolyte reaction chamber 5 can be exchanged through the porous graphite electrode 3 .

See attached drawings 1 and 2, the positive and negative poles of the flow battery system are connected to the power supply or load, and the electrolyte storage chambers of the positive and negative poles are filled with A ⁿ⁺ /A ^(n+x)+ ions and B ^m+ /B ^(m+ The positive and negative electrolytes of ^y)+ ions, the electrolyte can penetrate through the porous graphite electrode to the selective ion exchange membrane of the electrolyte reaction chamber for charge and discharge reactions. During the charging process, by applying a voltage between the positive and negative electrodes of the battery, the valence state of the ions in the electrolyte changes, thereby achieving the purpose of storing energy, that is, the charging process; during discharge, the ions in the electrolyte are valenced through the potential difference between the positive and negative electrolyte storage chambers. The state changes, and the directional movement of the charge produces a current output, that is, the discharge process.

During charging and discharging, the oxidation-reduction reaction that occurs in the battery is as follows:

positive electrode:

negative electrode:

Claims (2)

1. a kind of redox flow battery energy storage system for carrying electrolyte storage chamber, including plastic casing, graphite electrode, collector plate, choosing Selecting property amberplex, fastening bolt, battery electrode, it is characterised in that：Whole redox flow battery energy storage system is sealed in two and half In the plastic casing of rectangle, two halves rectangular plastic shell connects into a complete rectangle by the equidistant fastening bolt of a row Pipeline, plastic casing inner side are provided with two necks at closed end, and graphite electrode and collector plate are fixed on plastics by neck On the inside of shell, collector plate one end draws plastic casing and forms battery electrode, along faying face direction among two halves rectangular plastic shell Selective ion exchange membrane is equipped with, electrolyte reaction chamber, modeling are formed between selective ion exchange membrane and upper and lower two collector plate Expect to form electrolyte storage chamber between shell and graphite electrode, graphite electrode is porous graphite electrode, electrolyte storage chamber and electricity Electrolyte in solution liquid reaction chamber can be swapped by porous graphite electrode.

2. the redox flow battery energy storage system according to claim 1 for carrying electrolyte storage chamber, it is characterised in that described Collector plate is netted or porous metals collector plate.