Sealing structure used for moderate and high temperature battery, moderate and high temperature battery, and assembling method of sealing structure

Abstract

The invention relates to a sealing structure used for a moderate and high temperature battery, the moderate and high temperature battery, and an assembling method of the sealing structure. The sealing structure comprises a metal part used for leading out curren; a sealing cavity used for sealing an assembling gap is arranged on the inner side of a battery on the assembling gap, where the metal part is assembled, on the battery; the metal part passes through the sealing cavity; one layer, two layers, three layers or more than three layers of salt layers used for liquid seal are arranged in the sealing cavity; each salt layer is arranged from one side of the inner side of the battery to one side of the outer part of the battery, and the melting points successively lower. The sealing structure disclosed by the invention has excellent gas tightness and anti-corrosion property, the service life of the moderate and high temperature battery when the moderate and high temperature battery works at the temperature of 150-700DEG C is guaranteed, meanwhile, the sealing structure also has an insulation characteristic, volume occupied by battery sealing is greatly reduced under a condition that mechanical strength is guaranteed, and space is saved.

Description

technical field [0001] The invention belongs to the technical field of energy storage batteries, and in particular relates to a sealing structure for a medium-high temperature battery and an assembly method thereof. Background technique [0002] Among the existing electrochemical energy storage technologies, medium and high temperature energy storage batteries such as sodium-sulfur batteries, liquid metal batteries and other energy storage technologies have the characteristics of no pollution, high energy efficiency, flexible power and energy matching output, long life, low The maintenance cost and other advantages make it an energy storage technology with very good application prospects. [0003] The electrode materials of medium and high temperature batteries mostly use one or more of alkaline metals such as lithium, sodium, and magnesium. When the battery is working in a medium and high temperature environment (between 150°C and 700°C), the electrode material or electroly...

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Problems solved by technology

[0004] In the sealing design of high-temperature liquid metal batteries, most of them adopt the principle of assembly to achieve sealing, such as "a liquid metal battery device" (application number 201420780918.8), "semi-liquid metal electrode energy storage battery" (application number 201310131587.5) and other patents The insulating ceramic ring insulation used in the battery is installed or fastened, and the sealing performance cannot be guaranteed, and the battery structure of the above-mentioned patent is complex and bulky

[0005] For another example, patents such as "A Liquid Metal Battery Device and Its Assembly Method" (Application No. 201410350077.1) mention that "using sealed insulating ceramic parts to fasten the top of the metal current lead-out rod to the battery case" achieves sealing and insulation. The ceramic is only fastened on the metal current lead-out rod, so this sealing method cannot meet the stringent sealing requirements of liquid metal batteries at high temperatures (it may be possible to achieve sealing when fastened at room temperature, but ceramic fasteners may be damaged due to differences in material expansion coefficients at high temperatures) It is different from the thermal expansion and contraction of the fastening substrate, so that an effective seal cannot be achieved)

[0006] There are also improvements in sealing materials, such as "a sealing material for high-temperature energy storage batteries and its preparation" (application number 201310702834.2) mentions the use of CaAl 2 S 4 As a sealant, powder such as alumina + binder is used to form a sealing material for high-temperature energy storage batteries, and CaAl is required 2 S 4 As a sealant, the process is complicated by mixing powdered substances with high-temperature heat treatment to achieve sealing

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