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CN-122000382-A - Method for starting fuel cell

CN122000382ACN 122000382 ACN122000382 ACN 122000382ACN-122000382-A

Abstract

The present disclosure proposes a method of starting a fuel cell comprising a stack and a coolant circulation line connecting a coolant inlet and a coolant outlet of the stack, the method comprising the steps of S100 of supplying cathode gas and anode gas to the stack and detecting a stack temperature T stk of the stack, S200 of comparing the stack temperature T stk with a first predetermined temperature T prd1 , if T stk ≥T prd1 , S300 is performed, if T stk <T prd1 , S400 is performed, S300 of driving a coolant to flow in the coolant circulation line, S400 of detecting a high frequency impedance HFR of the stack according to a predetermined time sequence T 0 ,t 1 ,…,t n , S500 of comparing the high frequency impedance HFR i+1 detected at time T i+1 with the high frequency impedance HFR i detected at time T i , if r i+1 <HFR i , returning to S400, if HFR i+1 ≥HFR i is performed, wherein i=0, 1,2, and driving a coolant to flow in the coolant circulation line, S600.

Inventors

  • Yang Runchen
  • ZHANG HUIXIANG
  • TAO CHENGJUN
  • DONG REN

Assignees

  • 罗伯特·博世有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. A method of starting up a fuel cell, the fuel cell (100) comprising a stack (110) and a coolant circulation line (L1), the coolant circulation line (L1) connecting a coolant inlet (110 i ) of the stack (110) with a coolant outlet (110 o ), the method comprising the steps of: S100, supplying cathode gas and anode gas to the electric pile (110), and detecting electric pile temperature T stk of the electric pile (110); S200, comparing the pile temperature T stk with a first preset temperature T prd1 , and executing S300 if T stk ≥T prd1 , and executing S400 if T stk ＜T prd1 ; S300, driving a coolant to flow in the coolant circulation line (L1); S400, detecting high-frequency impedance HFR of the electric pile (110) according to a preset time sequence t 0 ,t 1 ,...,t n ; S500 compares the high frequency impedance HFR i+1 detected at time t i+1 with the high frequency impedance HFR i detected at time t i , returns to S400 if HFR i+1 ＜HFR i , performs S600 if HFR i+1 ≥HFR i , wherein i=0, 1,2, and n, and S600, driving a coolant to flow in the coolant circulation line (L1).
  2. 2. A method of starting up a fuel cell, the fuel cell (100) comprising a stack (110) and a coolant circulation line (L1), the coolant circulation line (L1) connecting a coolant inlet (110 i ) of the stack (110) with a coolant outlet (110 o ), the method comprising the steps of: S100, supplying cathode gas and anode gas to the electric pile (110), and detecting electric pile temperature T stk of the electric pile (110); S200, comparing the pile temperature T stk with a first preset temperature T prd1 , and executing S300 if T stk ≥T prd1 , and executing S400 if T stk ＜T prd1 ; S300, driving a coolant to flow in the coolant circulation line (L1); S400, detecting high-frequency impedance HFR of the electric pile (110) according to a preset time sequence t 0 ,t 1 ,...,t n ; S500 comparing the stack temperature T stk with the second predetermined temperature T prd2 and comparing the high-frequency impedance HFR i+1 detected at time T i+1 with the high-frequency impedance HFR i detected at time T i , returning to S400 if T stk ＜T prd2 and HFR i+1 ＜HFR i , performing S600 if T stk ≥T prd2 or HFR i+1 ≥HFR i , wherein i=0, 1,2, and n, and S600, driving a coolant to flow in the coolant circulation line (L1).
  3. 3. The method of claim 2, wherein the first predetermined temperature T prd1 and the second predetermined temperature T prd2 are set such that T prd1 ＜T prd2 .
  4. 4. A method of starting up a fuel cell, the fuel cell (100) comprising a stack (110) and a coolant circulation line (L1), the coolant circulation line (L1) connecting a coolant inlet (110 i ) of the stack (110) with a coolant outlet (110 o ), the method comprising the steps of: S100, supplying cathode gas and anode gas to the electric pile (110), and detecting electric pile temperature T stk of the electric pile (110); S200, comparing the pile temperature T stk with a first preset temperature T prd1 , and executing S300 if T stk ≥T prd1 , and executing S400 if T stk ＜T prd1 ; S300, driving a coolant to flow in the coolant circulation line (L1); S400, detecting high-frequency impedance HFR of the electric pile (110) according to a preset time sequence t 0 ,t 1 ,...,t n ; S500 comparing the high frequency impedance HFR i+1 detected at time t i+1 with the high frequency impedance HFR i detected at time t i and comparing the high frequency impedance HFR i+2 detected at time t i+2 with the high frequency impedance HFR i+1 detected at time t i+1 , returning to S400 if HFR i+1 ＜HFR i or HFR i+2 ＜HFR i+1 , and performing S600 if HFR i+1 ≥HFR i and HFR i+2 ≥HFR i+1 , wherein i=0, 1,2, n, and S600, driving a coolant to flow in the coolant circulation line (L1).
  5. 5. The method according to any one of claims 1 to 4, wherein, S300 consists in driving the coolant to flow in the coolant circulation line (L1) at a nominal flow rate V ctr .
  6. 6. The method of claim 5, wherein, S600 consists in driving the coolant to flow in the coolant circulation line (L1) at a nominal flow rate V ctr .
  7. 7. The method of claim 5, wherein the method further comprises, after S600, the steps of: s700, comparing the pile temperature T stk with a third preset temperature T prd3 , and executing S800 if T stk ＜T prd3 , and executing S900 if T stk ≥T prd3 ; S800 flowing a coolant in the coolant circulation line (L1) at a predetermined flow rate V ctp and returning to S700, and And S900, enabling a coolant to flow in the coolant circulation line (L1) at a rated flow rate V ctr , wherein V ctr ＞V ctD .
  8. 8. The method of claim 7, wherein the first predetermined temperature T prd1 and the third predetermined temperature T prd3 are set such that T prd1 ＜T prd3 .
  9. 9. The method of any of claims 1-4, wherein the stack temperature T stk is one of the parameters of a coolant inlet temperature T cti measured at the coolant inlet (110 i ), a coolant outlet temperature T cto measured at the coolant outlet (110 o ), or an average of a coolant inlet temperature T cti and a coolant outlet temperature T cto .
  10. 10. The method of any one of claims 1-4, wherein adjacent times in the predetermined time sequence t 0 ,t 1 ,...,t n are separated by a fixed time interval Δt such that t i+1 ＝t i + Δt, where i = 0,1,2,..n.

Description

Method for starting fuel cell Technical Field The present disclosure relates to the field of fuel cell technology, and more particularly, to a method of starting a fuel cell. Background Fuel cells have been developed as one of the main power generation technologies due to their advantages of high power generation efficiency, low environmental pollution, high specific energy, and the like. As a typical fuel cell, a Proton Exchange Membrane Fuel Cell (PEMFC) is a popular fuel cell for vehicles. PEMFCs generally include solid polymer electrolyte proton conducting membranes, such as perfluorosulfonic acid membranes. The anode and cathode typically include finely divided catalyst particles, typically platinum (Pt), supported on carbon particles and mixed with an ionomer. The catalyst mixture is deposited on opposite sides of the membrane. The combination of the anode catalyst mixture, the cathode catalyst mixture, and the membrane define a Membrane Electrode Assembly (MEA). The stack of fuel cells includes a series of bipolar plates positioned between several membrane electrode assemblies in the stack, with the bipolar plates and the membrane electrode assemblies positioned between two separator plates. The bipolar plate includes an anode side and a cathode side for adjacent cells in the stack. Anode gas flow channels are provided on the anode side of the bipolar plates that allow anode gas to flow to the respective membrane electrode assemblies. Cathode gas flow channels are provided on the cathode side of the bipolar plates that allow the cathode gas to flow to the respective membrane electrode assemblies. For oxy-hydrogen fuel cells, it is necessary to operate the stack at a suitable temperature to perform an electrochemical reaction to produce electrical energy, and water and heat are produced as by-products of the electrical energy. In some prior art fuel cell starting in low temperature environments, it is desirable to use the heat generated by the stack itself to raise its temperature to a suitable temperature, so that the thermal management system is started to help the stack cool down after the stack temperature has risen to a suitable temperature, however this ignores the water content of the proton exchange membrane, which may result in the water content of the proton exchange membrane having fallen to a lower level when the thermal management system is started, thereby adversely affecting the efficiency of the electrochemical reaction and the operation performance of the fuel cell. Therefore, there is a need in the art for a solution that can combine both the cold start rate of a fuel cell and the water content of a proton exchange membrane. Disclosure of Invention In order to solve the above-mentioned problems in the prior art, the present disclosure proposes an improved method for starting a fuel cell including a stack and a coolant circulation line connecting a coolant inlet and a coolant outlet of the stack, the method comprising the steps of: s100, supplying cathode gas and anode gas to the electric pile, and detecting electric pile temperature T stk of the electric pile; S200, comparing the pile temperature T stk with a first preset temperature T prd1, and executing S300 if T stk≥Tprd1, and executing S400 if T stk<Tprd1; S300, driving a coolant to flow in the coolant circulation pipeline; S400, detecting high-frequency impedance HFR of the electric pile according to a preset time sequence t 0,t1,…,tn; S500 compares the high frequency impedance HFR i+1 detected at time t i+1 with the high frequency impedance HFR i detected at time t i, returns to S400 if HFR i+1<HFRi, performs S600 if HFR i+1≥HFRi, wherein i=0, 1,2, and n, and And S600, driving a coolant to flow in the coolant circulation pipeline. Also in order to solve the above-described problems in the prior art, the present disclosure proposes another improved method for starting a fuel cell, the method comprising the steps of: s100, supplying cathode gas and anode gas to the electric pile, and detecting electric pile temperature T stk of the electric pile; S200, comparing the pile temperature T stk with a first preset temperature T prd1, and executing S300 if T stk≥Tprd1, and executing S400 if T stk<Tprd1; S300, driving a coolant to flow in the coolant circulation pipeline; S400, detecting high-frequency impedance HFR of the electric pile according to a preset time sequence t 0,t1,…,tn; S500 comparing the stack temperature T stk with the second predetermined temperature T prd2 and comparing the high-frequency impedance HFR i+1 detected at time T i+1 with the high-frequency impedance HFR i detected at time T i, returning to S400 if T stk<Tprd2 and HFR i+1<HFRi, performing S600 if T stk≥Tprd2 or HFR i+1≥HFRi, wherein i=0, 1,2, and n, and And S600, driving a coolant to flow in the coolant circulation pipeline. Still in order to solve the above-mentioned problems in the prior art, the present disclosure proposes yet another improved method for