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CN-115332585-B - Fuel cell stack, assembly method, fuel cell module and vehicle

CN115332585BCN 115332585 BCN115332585 BCN 115332585BCN-115332585-B

Abstract

The application discloses a fuel cell stack, an assembling method, a fuel cell module and a vehicle, which can enlarge the installation space of a connector and improve the structural strength of the connector. The fuel cell stack comprises a low-voltage wire harness, a reactor core with tab rows and a connector assembly, wherein the reactor core is electrically connected with the tab rows, the reactor core comprises a plurality of single cells which are stacked, the odd-numbered and/or even-numbered single cells in the reactor core are provided with tab rows, each tab forms the tab row, and the connector assembly is connected with the tab of the odd-numbered and/or even-numbered single cells in the reactor core. Since a single connector assembly is connected only to odd-numbered or even-numbered single cells, the mounting-position pitch of the connector can be doubled at least, ensuring that the connector has a sufficient wall thickness, thereby improving the structural strength thereof. At least one of the connector assemblies is electrically connected with the low voltage wiring harness to enable different inspection schemes.

Inventors

  • WU HAO
  • WANG SHOULONG
  • XIONG JIE
  • XIONG CHENGYONG
  • QIN BOWEN

Assignees

  • 东风汽车集团股份有限公司

Dates

Publication Date
20260505
Application Date
20220720

Claims (11)

  1. 1. A fuel cell stack comprises a low-voltage wire harness, a reactor core with tab rows and a connector assembly electrically connected with the tab rows, and is characterized in that the reactor core comprises a plurality of single cells which are stacked, the single cells are provided with tab rows, each tab row is formed by at least two connector rows, the tabs of the single cells with odd numbers form a first tab row, the tabs of the single cells with even numbers form a second tab row, the positions of the first tab row and the second tab row are different, the connector assembly is connected with the tabs of the single cells with odd numbers and even numbers in the reactor core, and a single connector assembly is only connected with the single cells with odd numbers or even numbers, the connector assembly comprises at least two connector rows, the number of the connector positions in each connector row is more than two, the connector positions in each connector row are distributed, the connector positions in each connector row are located at the same row, and the connector positions in each connector row are located at the same distance, and the connector assembly is used for connecting at least one connector assembly with the low-voltage wire harness.
  2. 2. The fuel cell stack according to claim 1 wherein said first tab row and said second tab row are each connected to said connector assembly, at least one of said connector assemblies being electrically connected to said low voltage wiring harness.
  3. 3. The fuel cell stack according to any one of claims 1 to 2, wherein at least one end of the core in the stacking direction is provided with a sealing structure, the sealing structure comprises at least one dummy membrane electrode and at least one plate unit which are alternately stacked, the dummy membrane electrode is a membrane electrode structure which is provided with a sealing ring and cannot perform electrochemical reaction, the plate unit is provided with a tab, and the connector assembly is electrically connected with both the tab of the core and the tab of the sealing structure.
  4. 4. The fuel cell stack according to any one of claims 1 to 2, wherein the connector comprises two rows of connection sites, the number of connection sites in each row of connection sites is four or more, and the pitch D of connection sites in the same row is 4D, wherein D is the inter-plate pitch of bipolar plates of two adjacent single cells.
  5. 5. The fuel cell stack according to any one of claims 1 to 2, wherein the first end of the connector in the stacking direction is provided with a concave portion, and the second end is provided with a convex portion that mates with the concave portion.
  6. 6. The fuel cell stack according to any one of claims 1 to 2, wherein said connector to which a low-voltage wire harness is connected is of unitary construction with said low-voltage wire harness.
  7. 7. The fuel cell stack according to any one of claims 1 to 2, wherein the unit cell comprises bipolar plates and membrane electrodes which are stacked, the bipolar plates are processed from a substrate, two tabs are provided on the substrate, and the two tabs are respectively located on two opposite sides of the substrate.
  8. 8. The fuel cell stack according to claim 7, wherein two of said tabs are arranged in a staggered manner or in a central symmetrical manner, and wherein two of said tabs are respectively located on two short sides of said substrate.
  9. 9. A method of assembling a fuel cell stack as claimed in claim 1 or 2, comprising the steps of: Cutting and removing one of the lugs in the substrate provided with the two lugs to obtain a bipolar plate, wherein the lugs of the bipolar plate with odd numbers and the lugs of the bipolar plate with even numbers are distributed on different sides of the bipolar plate; During the assembly process of the electric pile, the bipolar plates with odd numbers or the bipolar plates with even numbers are stacked after being rotated for 180 degrees, and the bipolar plates are stacked to form the first tab row and the second tab row; And respectively connecting a connector assembly connected with a low-voltage wire harness and a connector assembly not connected with the low-voltage wire harness with the first tab row and the second tab row to obtain the fuel cell stack.
  10. 10. A fuel cell module comprising a low voltage routing inspection device and at least one fuel cell stack according to any one of claims 1-8, said low voltage routing inspection device being electrically connected to said low voltage wiring harness.
  11. 11. A vehicle characterized by comprising at least one fuel cell stack according to any one of claims 1-8, or a fuel cell module according to claim 10.

Description

Fuel cell stack, assembly method, fuel cell module and vehicle Technical Field The application belongs to the technical field of fuel cell stacks, and particularly relates to a fuel cell stack, an assembly method, a fuel cell module and a vehicle. Background The proton exchange membrane fuel cell is a power generation device which uses hydrogen as fuel and directly converts chemical energy into electric energy. The fuel cell has the advantages of high energy density, high starting speed, low operating temperature, no pollution of products and the like, so that the fuel cell has potential application value in the field of new energy automobiles. The structure of the fuel cell stack is usually formed by stacking hundreds of membrane electrodes, bipolar plates and sealing elements, fastening force is applied to the end plates, insulating plates and current collecting plates at two sides, energy is collected and output, high voltage is isolated, and the end plates of the fuel cell stack are fastened and connected through strapping bands, pull rods, screws and the like to form the fuel cell stack. Inside the fuel cell stack, the reactant gases (hydrogen and air) and coolant are distributed to each single cell through the manifold ports of the bipolar plates, and thus the size of the manifold ports directly affects the size of the three-chamber flow resistance of the stack. Inside each single cell, hydrogen and air are uniformly distributed through the flow channels on the anode side and the cathode side respectively and transferred to the membrane electrode. Under the action of the catalysts of the cathode and the anode at the two sides of the proton exchange membrane in the membrane electrode, the cathode and the anode reaction medium react electrochemically to convert chemical energy into electric energy. In the normal use process of the proton exchange membrane fuel cell, the performance is related to bad operation conditions such as overdry, air deficiency and the like of an air inlet system, mechanical damage and other factors, and the voltage of a single cell of the fuel cell is further influenced to change. Therefore, it is necessary to collect the voltage signal of the single cell of the fuel cell, send the voltage signal to the fuel cell system controller, determine the working state of the fuel cell by inspecting the voltage signal of the single cell, and perform a corresponding control operation, specifically, inspect the voltage of each bipolar plate by using a voltage inspecting device (CVM for short). The bipolar plate and the CVM are connected by a voltage inspection connector, and when the bipolar plate is connected, the bipolar plate is inserted into the connector, and then signals or electric energy is transmitted to the CVM through a low-voltage wire harness so as to perform data and energy conversion. With the development of technology, the volume power density of the electric pile is gradually increased, the plate spacing of the bipolar plates is gradually reduced, and the thickness of the outer wall of the adjacent voltage inspection connector is required to be reduced, so that the strength of the connector is reduced. Disclosure of Invention In order to solve the technical problems, the application provides a fuel cell stack, an assembly method, a fuel cell module and a vehicle, which can realize a plurality of inspection modes such as single-chip inspection, double-chip inspection and the like, so that the installation site interval of a connector is enlarged, and the structural strength of the connector is improved. The technical scheme adopted for achieving the purpose of the application is that the fuel cell stack comprises a low-voltage wire harness, a reactor core with a lug row and a connector assembly electrically connected with the lug row, wherein the reactor core comprises a plurality of single cells which are stacked, the single cells with odd numbers and/or even numbers in the reactor core are provided with lugs, each lug forms the lug row, the connector assembly is connected with the lugs of the single cells with odd numbers and/or even numbers in the reactor core, and at least one connector assembly is electrically connected with the low-voltage wire harness. In some embodiments, the odd-numbered and even-numbered single cells in the core are each provided with a tab, the tabs of the odd-numbered single cells forming a first tab row, and the tabs of the even-numbered single cells forming a second tab row. In some embodiments, the first tab row and the second tab row are each connected with the connector assembly, at least one of the connector assemblies being electrically connected with the low voltage harness. In certain embodiments, the odd-numbered or even-numbered cells in the core are provided with tabs. In some embodiments, at least one end of the reactor core along the stacking direction is provided with a sealing structure, the sealing structure comprises at least on