Multifunctional end plate applied to fuel cell stack and working mode thereof

Abstract

The invention provides a multifunctional end plate applied to a fuel cell stack. The multifunctional end plate comprises a front end plate and a rear end plate. The front end plate is attached to thefront insulating plate of the fuel cell stack. The rear end plate is attached to the rear insulating plate. An air inlet and a hydrogen inlet are arranged above the front end surface of the front endplate, and a coolant inlet is arranged below. A first air guiding cavity communicated with the air inlet, a first hydrogen guiding cavity communicated with the hydrogen inlet and a first coolant guiding cavity communicated with the coolant inlet are arranged on the rear end surface of the front end plate. An air outlet and a hydrogen outlet are arranged below the rear end surface of the rear end plate, and a coolant outlet is arranged above. A second air guiding cavity communicated with the air outlet, a second hydrogen guiding cavity communicated with the hydrogen outlet and a second coolantguiding cavity communicated with the coolant outlet are arranged on the front end surface of the rear end plate. The invention provides a working mode of the multifunctional end plate. According to the invention, the use requirement of a high-power fuel cell stack can be met; the impact of the gas flow change on the stack is reduced; and the structure of the fuel cell system is simplified.

Description

technical field [0001] The invention relates to a multifunctional end plate for a proton exchange membrane fuel cell stack and its working method, belonging to the technical field of fuel cells. Background technique [0002] Fuel cell end plate The end plate of the fuel cell stack cooperates with the fasteners to provide packaging force for the internal components and is an important part that determines the overall performance of the cell stack. Common end plate forms include: square end plate, cylindrical end plate, D-shaped end plate, etc. [0003] The function of the existing fuel cell end plate is simple, and it is directly connected to the internal component channel of the fuel cell stack through a circular channel. After the reaction medium enters the internal component channel from the end plate channel, the pressure distribution is uneven, which will lead to uneven internal reaction of the stack. Affect the performance and service life of the stack; especially when...

AI Technical Summary

Problems solved by technology

[0003] The function of the existing fuel cell end plate is simple, and it is directly connected to the internal component channel of the fuel cell stack through a circular channel. After the reaction medium enters the internal component channel from the end plate channel, the pressure distribution is uneven, which will lead to uneven internal reaction of the stack. Affect the performance and service life of the stack; especially when the pressure of the stack reaction medium is further increased, this inhomogeneity will become more obvious, which cannot meet the needs of high-power fuel cell stacks

And when the working condition of the high-power fuel cell stack changes, the change of gas flow will have a greater impact on the stack, affecting the performance and life of the fuel cell stack

[0004] At the same time, the structure of the current fuel cell engine system is complex. The pressure and temperature sensors and connecting components are all arranged on the connecting pipes of the stack. Large, it is difficult to meet the needs of large-scale promotion of fuel cells in the future

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