A method for manufacturing an integrated sealed electric stack

Abstract

The invention discloses a method for manufacturing an integrated sealed electric stack, which belongs to the field of manufacturing technology. The manufacturing method includes: 1) completing the processing of the bipolar plate and the processing of the membrane electrode according to the stack design drawings; 2) adopting an in-situ online dispensing process, that is, dispensing operations are performed on both sides of the bipolar plate; 3 ) adopts in-situ online glue filling process. The process route of bipolar plate equidistant sealing, glue filling or dispensing in-situ encapsulation provided by the present invention fundamentally solves the technical defects existing in the current stack assembly process; The steady-state sealing process simplifies the assembly process, reduces the influence of factors such as labor and dimensional tolerances on the stack assembly, and improves the consistency, safety, durability and production efficiency of the stack.

Description

technical field [0001] The invention belongs to the field of manufacturing technology, and in particular relates to a manufacturing method of an integrated sealed stack. Background technique [0002] Fuel cell is a kind of energy conversion device, which converts the chemical energy stored in fuel and oxidant directly into electrical energy according to the electrochemical principle. It has the advantages of high power generation efficiency and less environmental pollution, and has a wide application prospect. Due to the limited output power of fuel cell single cells, in practical applications, several single cells need to be stacked like "building blocks" to form a fuel cell stack to meet the corresponding power, voltage, and current requirements. The fuel of the fuel cell is generally hydrogen, methanol, methane, air or oxygen as the oxidant. Among them, the fuel and the oxidant cannot be in direct contact and must be separated by a sealing device, otherwise the safety of ...

AI Technical Summary

Problems solved by technology

But there are several problems with this kind of sealing: 1) Generally, this kind of sealing process adopts the non-in-situ method to form the gasket, that is, first use other molds to make the gasket, and then use the formed gasket by dispensing or other methods. bonded in the seal groove to form a seal

It can be seen that the process is relatively complicated on the one hand; on the other hand, the sealing gasket is bonded to the sealing groove of the bipolar plate by dispensing or other methods, which changes the depth of the sealing groove, seriously affects the assembly process parameters, and increases If the pressure on the sealing wire during packaging is increased, it may cause mechanical damage to the bipolar plate due to excessive stress, and also affect the performance of the stack; in addition, use dispensing or other processes to bond the gasket to the sealing In the tank, there are high requirements for dispensing or other bonding processes. At present, the cell stack assembled by this method often fails to assemble the cell stack due to the difference in the height of the protruding bipolar plate after the gasket is bonded.

2) Using this sealing process, the sealing of the stack and the final assembly effect are dynamic, that is, within a certain deformation range of the gasket, the stack can be sealed, but the final energy of the stack may be different, so this The sealing method, on the one hand, requires very high assembly parameters, the size of the assembly force, the process of the press-fitting process, and the position of the press-fitting all affect the final assembly effect; on the other hand, due to the bipolar plate, gasket, upper and lower ends There is a certain tolerance in the thickness of the plate and the pressing plate. After assembly, the deformation of the membrane electrode in the stack is bound to be different, which will directly affect the performance and operating life of the stack.