Energy storage sodium-sulfur battery module with high safe protection design

Abstract

The invention provides an energy storage sodium-sulfur battery module with a high safe protection design. The energy storage sodium-sulfur battery module is characterized in that first, single batteries integrated at the inner part of the module are divided into a plurality of groups according to the designed power and capacity of the module, each group comprises a specified number of single batteries which are simply connected in series or in parallel, and the connection of current lines among each single battery group unit is controlled by a switch with a protection design; second, the inner part of the module adopts a composite gradient physical isolation layer, and physical protection layers for forced isolation are designed among the single batteries and between the batteries and the inner wall of a module insulation can; and when a plurality of sodium-sulfur batteries of the inner part of the module are severely damaged and even diffuse pollution outwards, the secondary disasters caused by the fact that the mutual chain pollution or damage among the batteries is diffused to the outer part of the module is effectively prevented.

Description

technical field [0001] The invention provides an energy storage sodium-sulfur battery module with a high safety protection design, which can effectively prevent secondary disasters caused by interlocking pollution or damage of batteries spreading to the outside of the module, and belongs to the field of physical and chemical devices. Background technique [0002] Sodium sulfur battery (NAS for short) uses beta-alumina ceramics with good sodium ion conductivity as the electrolyte, metallic sodium as the negative electrode material, and non-metallic sulfur as the positive electrode material. When the battery is discharged, the external electrical energy is stored in the form of conversion into chemical energy (Na, S). During discharge, sodium and sulfur form sodium polysulfide through an electrochemical reaction to convert chemical energy into electrical energy and release it. The theoretical capacity of a single sodium-sulfur battery can reach more than 700Ah / Kg, and it has t...

AI Technical Summary

Problems solved by technology

In the above patent applications, it is mainly proposed to use sand filling materials. Due to the poor thermal conductivity of sand materials, this greatly increases the unevenness of the internal temperature field of the module, and at the same time greatly prolongs the temperature from room temperature to working temperature. The hot start time of the module

Due to the strong fluidity of sand materials, it is often impossible to effectively achieve an absolute isolation effect after a certain amount of batteries inside the module are damaged.

Also, when replacing a module after damage, a large amount of quicksand-like material will make battery replacement difficult

When some single cells inside the module are damaged, there is also concern about battery chain reactions. Once individual or several batteries are damaged during charging and discharging, if the damaged batteries cannot be disconnected from the current loop connected in groups in time, the battery will be damaged. Electrochemical cascading damage, further causing a large number of battery failures and the module will eventually fail to work

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