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CN-122025722-A - Fuel cell stack

CN122025722ACN 122025722 ACN122025722 ACN 122025722ACN-122025722-A

Abstract

The application discloses a fuel cell stack, which comprises an electric core, a package, a first end cover, a second end cover and a blind end plate. The blind end plate is located on one side of the first end face facing the battery cell and is in sliding fit with the inner wall of the package so that the blind end plate can move along a pressing direction which is parallel to the direction from the second end cover to the first end cover, and the blind end plate is configured in such a way that a preset gap exists between the surface of the battery cell pressed by the blind end plate and the inner wall of the package when the blind end plate and the package are in an assembled state. Compared with the related art, the fuel cell stack disclosed by the application can actively and accurately form a preset gap between the battery cell and the package when the fuel cell stack is assembled. The gap effectively prevents the electric core from being directly rigidly extruded and rubbed with the rigid shell due to vibration impact, thereby avoiding mechanical damage, breakage or performance attenuation of the battery assembly and greatly improving the reliability and durability of the fuel cell stack.

Inventors

  • MENG WEIZHI
  • SHI WEIYU
  • HOU ZHONGJUN
  • LI HUIZHE

Assignees

  • 上海捷氢科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (11)

  1. 1. A fuel cell stack, comprising: A cell (400); -a package (200) for accommodating said battery cell (400); a first end cap (100) and a second end cap (600) disposed at both ends of the package (200); A blind end plate (700) located at a side of the first end cap (100) facing the battery cell (400) and slidably engaged with an inner wall of the package (200) such that the blind end plate (700) is movable in a pressing direction parallel to a direction from the second end cap (600) toward the first end cap (100), the blind end plate (700) being configured such that a predetermined gap exists between a surface of the battery cell (400) pressed by the blind end plate (700) and the inner wall of the package (200) in an assembled state of the blind end plate (700) and the package (200).
  2. 2. The fuel cell stack according to claim 1, wherein the package (200) includes a package body (220) and a support rail (210) provided to the package body (220), an extending direction of the support rail (210) being parallel to the pressing direction; The outer edge of the blind end plate (700) is provided with bosses (710), the bosses (710) are in one-to-one correspondence and are in sliding fit with the support guide rails (210), the preset gap is a gap between the top surface of the support guide rails (210) and the surface of the battery cell (400), and the top surface is the surface of the support guide rails (210) facing the battery cell (400).
  3. 3. The fuel cell stack according to claim 2, wherein the package body (220) has four side walls, each of which is provided with at least one of the support rails (210) on an inner side thereof.
  4. 4. The fuel cell stack according to claim 1, further comprising a first current collecting assembly (300) and a second current collecting assembly (500) disposed at both ends of the cell (400), respectively, for collecting and guiding out the current of the cell (400); the second current collecting assembly (500) is arranged between the second end cover (600) and the battery cell (400), and comprises a first current collecting plate (510) and a second current collecting plate (520); The first current collecting plate (510) is provided with a flow channel (511) communicated with the cavity (410) of the battery cell (400), and the second current collecting plate (520) is arranged between the first current collecting plate (510) and the battery cell (400) and is electrically connected with the battery cell (400).
  5. 5. The fuel cell stack according to claim 4, wherein a surface of the first current collecting plate (510) facing the electric cell (400) is provided with a groove, the second current collecting plate (520) includes a main plate (522) electrically connected to the electric cell (400), and a current lead-out terminal (521) extending outward from the main plate (522), and the main plate (522) is accommodated in the groove.
  6. 6. The fuel cell stack according to claim 4, wherein the first current collecting plate (510) is a metal member, the second current collecting plate (520) is made of a conductive material, and a surface of the first end cap (100) facing the second current collecting member (500) is provided with an insulating layer.
  7. 7. The fuel cell stack according to claim 4, wherein the first current collecting plate (510) and the second current collecting plate (520) are fixedly connected as one body by bonding or welding.
  8. 8. The fuel cell stack of claim 4, further comprising a first insulator (900), the first insulator (900) being disposed between the cell (400) and the blind end plate (700), a surface of the first insulator (900) facing the cell (400) being provided with a receiving slot (910) for receiving the first current collecting assembly (300).
  9. 9. The fuel cell stack of claim 8, further comprising a second insulator (1000), said second insulator (1000) comprising at least one insulating film and being located on a side of said first insulator (900) facing away from said first current collecting assembly (300).
  10. 10. The fuel cell stack according to claim 9, wherein a middle region of the second insulator (1000) is recessed in a direction approaching the first current collecting member (300).
  11. 11. The fuel cell stack of claim 4 further comprising a float member (800) and an elastic member (1100), said float member (800) being positioned between said first current collecting assembly (300) and said blind end plate (700), said elastic member (1100) being configured such that when said first end cap (100) and said second end cap (600) are in an assembled state with said package (200), an elastic force of said elastic member (1100) is directed in a direction that said float member (800) is proximate to said electrical core (400).

Description

Fuel cell stack Technical Field The present application relates to the field of fuel cell technology, and more particularly, to a fuel cell stack. Background The fuel cell stack is used as a power generation device for directly converting chemical energy into electric energy, and the core of the fuel cell stack is an electric core formed by stacking a plurality of single cells in series. In order to maintain the high efficiency and stability of the electrochemical reaction, good and uniform contact between the components inside the cell must be provided, while ensuring reliable sealing of the reaction gases and the cooling medium. Therefore, in the assembly of the fuel cell stack, it is necessary to apply sufficient assembly compressive force in the direction of the stacking axis of the cells, which is typically provided by end caps and tie rod or strap systems at both ends. Conventional fuel cell stack package designs typically place the cells in a rigid package and secure the ends of the cells to the end caps and current collecting assembly so that the cells are restrained in the length direction and in direct contact with the package interior walls in the lateral direction. However, this structure is at risk of mechanical damage, and if the fuel cell stack is subjected to vibration, impact, or thermal expansion of the cells, the cells are constrained by the rigidity of the housing side walls, resulting in significant lateral compressive stresses. This stress can lead to brittle graphite bipolar plates cracking, membrane electrode deformation, or seal failure, affecting the life and safety of the fuel cell stack. Therefore, how to reduce the risk of mechanical damage and improve the overall reliability of the fuel cell stack is a technical problem to be solved by those skilled in the art. Disclosure of Invention The application aims to disclose a fuel cell stack, which is used for reducing the risk of mechanical damage and improving the overall reliability of the fuel cell stack. A fuel cell stack comprising: A battery cell; A package for accommodating the battery cell; The first end cover and the second end cover are arranged at two ends of the package; The battery pack comprises a first end cover, a second end cover, a blind end plate, a battery cell and a battery pack, wherein the blind end cover is positioned on one side of the first end cover facing the battery cell and is in sliding fit with the inner wall of the battery pack, so that the blind end plate can move along a squeezing direction, the squeezing direction is parallel to the direction from the second end cover to the first end cover, and the blind end plate is configured in such a way that a preset gap exists between the surface of the battery cell pressed by the blind end plate and the inner wall of the battery pack when the blind end plate and the battery pack are in an assembled state. In one possible implementation manner, the package includes a package body and a support rail provided to the package body, and an extension direction of the support rail is parallel to the extrusion direction; the outer edge of the blind end plate is provided with bosses which are in one-to-one correspondence with the support guide rails and are in sliding fit, the preset gap is a gap between the top surface of the support guide rails and the surface of the battery cell, and the top surface is the surface of the support guide rails facing the battery cell. In one possible implementation, the package body has four side walls, and at least one support rail is disposed on an inner side of each side wall. In one possible implementation manner, the battery cell further comprises a first current collecting component and a second current collecting component, which are respectively arranged at two ends of the battery cell and used for collecting and guiding out the current of the battery cell; The second current collecting assembly is arranged between the second end cover and the battery cell and comprises a first current collecting plate and a second current collecting plate; the first current collecting plate is provided with a flow channel communicated with the cavity of the battery cell, and the second current collecting plate is arranged between the first current collecting plate and the battery cell and is electrically connected with the battery cell. In one possible implementation, the surface of the first current collecting plate facing the battery cell is provided with a groove, the second current collecting plate comprises a main plate electrically connected with the battery cell and a current leading-out end extending outwards from the main plate, and the main plate is accommodated in the groove. In one possible implementation, the first current collecting plate is a metal piece, the second current collecting plate is made of a conductive material, and the surface of the first end cap facing the second current collecting assembly is provided with an i