CN-121983620-A - Method, device, equipment and storage medium for repairing electric pile of fuel cell

CN121983620ACN 121983620 ACN121983620 ACN 121983620ACN-121983620-A

Abstract

A stack maintenance method, device and equipment of a fuel cell and a computer readable storage medium comprise the steps of matching corresponding target cells according to size parameters and initial contact resistance of collected fault cells, calculating a cell depreciation degree value of the fault cells according to historical operation parameters of the collected fault cells, determining target pre-compression pressure and pressure maintaining time of the target cells according to the cell depreciation degree value of the fault cells, pressing the target cells to a preset height at a preset position according to the target pre-compression pressure and the pressure maintaining time, measuring the overall internal resistance of a current cell core, determining whether the pressing is completed or not based on the overall internal resistance of the current cell core, and packaging when the pressing is completed, so that the technical problem of poor sealing adaptation caused by inconsistent deformation states of sealing lines between new cells and old cells is directly replaced in the prior fuel cell stack maintenance method in related technology is solved.

Inventors

KE XUEFENG
HUANG ZHIWEI
YANG LEI
RUAN HONG
YIN LEI

Assignees

东风汽车集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A method of stack repair for a fuel cell, comprising: matching corresponding target batteries according to the size parameters of the collected fault batteries and the initial contact resistance; calculating a battery depreciation degree value of the fault battery according to collected historical operation parameters of the fault battery, wherein the historical operation parameters comprise historical operation environment parameters and historical operation key parameters, and the historical operation environment parameters comprise average operation temperature, standard deviation of temperature fluctuation and average humidity; determining target pre-pressing pressure and pressure maintaining duration of the target battery according to the battery depreciation degree value of the fault battery; The target battery is pressed to be at a preset position to a preset height according to the target pre-pressing pressure and the pressure maintaining time, and the overall internal resistance of the current battery core is measured; and determining whether the press-fitting is completed or not based on the overall internal resistance of the current battery core so as to perform packaging when the press-fitting is completed.
2. The method for stack repair of a fuel cell according to claim 1, wherein said calculating a cell depreciation level value of said failed cell based on collected historical operating parameters of said failed cell comprises: Acquiring a preset battery depreciation degree formula; And calculating a battery depreciation degree value of the fault battery according to the preset battery depreciation degree formula, the historical operation environment parameter and the historical operation key parameter, wherein the historical operation key parameter comprises accumulated operation duration, disassembly and assembly times, performance attenuation rate, overall stack internal resistance increase rate and three-cavity flow resistance increase rate.
3. The stack repair method of a fuel cell according to claim 1, wherein the determining the target pre-compression pressure and dwell time of the target cell based on the cell depreciation degree value of the failed cell includes: Determining the target pre-compression pressure of the target battery according to the obtained preset safety upper limit pressure value and the battery depreciation degree value of the fault battery; And determining the pressure maintaining time of the target battery according to the obtained preset material relaxation rate, the preset sealing line diameter, the preset process coefficient and the battery depreciation degree value of the fault battery.
4. The stack repair method of a fuel cell of claim 1, wherein the determining whether press-fitting is completed based on the overall internal resistance of the current cell core to perform the packaging when the press-fitting is completed comprises: comparing the overall internal resistance of the current battery reactor core with a preset overall internal resistance; If the overall internal resistance of the current battery core is smaller than or equal to the preset overall internal resistance, determining that press fitting is completed; After the press fitting is finished, determining whether the flow resistance is qualified or not according to the hydrogen cavity pressure drop value, the air cavity pressure drop value and the cooling liquid cavity pressure drop value of the current battery core; if the hydrogen cavity pressure drop value is smaller than or equal to a preset hydrogen cavity pressure drop value, the air cavity pressure drop value is smaller than or equal to a preset air cavity pressure drop value and the cooling liquid cavity pressure drop value is smaller than or equal to a preset cooling liquid cavity pressure drop value, determining that the flow resistance is qualified; And when the flow resistance is determined to be qualified, packaging.
5. The stack repair method of a fuel cell of claim 4, further comprising, after comparing the total internal resistance of the current cell core with a preset total internal resistance: If the overall internal resistance of the current battery core is larger than the preset overall internal resistance, starting a pressure control mode, wherein the pressure control mode is to slowly press-fit at a preset position according to a preset press-fit pressure value; after the pressure control mode is started, measuring the overall internal resistance of the current battery core and the press-fitting force of the target battery again; if the total internal resistance of the current battery core is measured again and is smaller than or equal to the preset total internal resistance, and the press-fitting force of the target battery is smaller than a preset safety upper limit pressure value, determining that press-fitting is completed; If the press-fitting force of the target battery is larger than or equal to a preset safety upper limit pressure value, and the overall internal resistance of the current battery core is measured again to be larger than the preset overall internal resistance, the thickness of the insulating gasket is calculated, and the insulating gasket is added between the end plate and the current collecting plate to determine that press-fitting is completed.
6. The stack repair method of a fuel cell according to claim 5, wherein the calculating of the thickness of the insulating spacer includes: calculating a height difference value according to the obtained preset reactor core height value and the actual height value of the current reactor core; and calculating the thickness of the insulating gasket according to the height difference and a preset safety margin.
7. The stack repair method of the fuel cell of claim 4, wherein the determining whether the flow resistance is acceptable based on the hydrogen cavity pressure drop value, the air cavity pressure drop value, and the coolant cavity pressure drop value of the current cell core further comprises: If the hydrogen cavity pressure drop value is not smaller than or equal to a preset hydrogen cavity pressure drop value, and/or the air cavity pressure drop value is not smaller than or equal to a preset air cavity pressure drop value, and/or the cooling liquid cavity pressure drop value is not smaller than or equal to a preset cooling liquid cavity pressure drop value, determining that the flow resistance is unqualified; If the flow resistance is determined to be unqualified, the target battery is pressed to be at a preset position to a preset height according to the target pre-pressing pressure and the pressure maintaining time, and the overall internal resistance of the current battery core is re-measured; And determining whether the press-fitting is completed or not based on the re-measurement of the overall internal resistance of the current battery core so as to perform packaging when the press-fitting is completed.
8. A stack repair device of a fuel cell, characterized by comprising: the acquisition module is used for matching the corresponding target battery according to the size parameter of the acquired fault battery and the initial contact resistance; The calculation module is used for calculating a battery depreciation degree value of the fault battery according to collected historical operation parameters of the fault battery, wherein the historical operation parameters comprise historical operation environment parameters and historical operation key parameters, and the historical operation environment parameters comprise average operation temperature, standard deviation of temperature fluctuation and average humidity; the determining module is used for determining the target pre-pressing pressure and the pressure maintaining duration of the target battery according to the battery depreciation degree value of the fault battery; the press-fitting and measuring module is used for press-fitting the target battery to a preset height at a preset position according to the target pre-pressing pressure and the pressure maintaining time length and measuring the overall internal resistance of the current battery core; and the determining and packaging module is used for determining whether the press-fitting is finished or not based on the overall internal resistance of the current battery core so as to package when the press-fitting is finished.
9. A stack maintenance device of a fuel cell, characterized in that the stack maintenance device of a fuel cell comprises a processor, a memory, and a stack maintenance program of a fuel cell stored on the memory and executable by the processor, wherein the stack maintenance program of a fuel cell, when executed by the processor, implements the steps of the stack maintenance method of a fuel cell according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a stack repair program for a fuel cell, wherein the stack repair program for a fuel cell, when executed by a processor, implements the steps of the stack repair method for a fuel cell according to any one of claims 1 to 7.

Description

Method, device, equipment and storage medium for repairing electric pile of fuel cell Technical Field The present application relates to the field of cell repair, and in particular, to a method, apparatus, and device for repairing a fuel cell stack, and a computer readable storage medium. Background The fuel cell stack is used as a core power component of a fuel cell system, the performance stability of the fuel cell stack directly determines the output efficiency and the service life of the fuel cell, and the fuel cell stack is widely applied to the fields of new energy automobiles, distributed power generation and the like. The electric pile is formed by stacking tens to hundreds of single cells in series, each single cell comprises a membrane electrode and a bipolar plate, three fluid channel holes of a hydrogen cavity, a cavity and a water cavity are correspondingly formed in the bipolar plate and the membrane electrode, and sealing wires are arranged on the periphery of the bipolar plate and the membrane electrode for isolating various fluids and preventing leakage. In the assembly stage of the electric pile, the preset pressure is applied and fixed through the integral press-fitting process, so that the sealing lines of the single cells are mutually extruded to generate elastic deformation, the three-cavity flow channel is effectively sealed, the transmission of fluids such as hydrogen, cooling liquid and the like according to a preset path is ensured, and the normal working condition of the electric pile is maintained. In the long-term service process, the single cell is easy to fail due to fluctuation of working conditions, ageing of materials and the like, the existing maintenance scheme generally adopts a direct disassembly and replacement mode, and the failed single cell (comprising a membrane electrode and a bipolar plate) is integrally disassembled and replaced by a brand new part and then reassembled. However, the maintenance method has significant technical defects, and the core problem is caused by inconsistent deformation states of the sealing lines of the new and old single cells. The sealing line of the new replaced single cell is in an original undeformed state, and the deformation characteristics of the sealing line and the original undeformed state are not matched. After re-press mounting, the sealing lines cannot form a sealing surface which is uniformly attached, gaps are easy to occur, three-cavity fluid is leaked in series, the sealing reliability of the electric pile is reduced, the problems of output power reduction, starting failure and the like are further caused, even potential safety hazards are caused when the problems are serious, and the service life and the performance stability of the fuel cell electric pile after maintenance are restricted. Disclosure of Invention The application provides a method, a device, equipment and a computer readable storage medium for repairing a fuel cell stack, which can solve the technical problem of poor sealing adaptation caused by inconsistent deformation states of sealing lines between a new cell and an old cell in the existing method for repairing the fuel cell stack in the prior art. In a first aspect, an embodiment of the present application provides a method for repairing a stack of a fuel cell, including: matching corresponding target batteries according to the size parameters of the collected fault batteries and the initial contact resistance; calculating a battery depreciation degree value of the fault battery according to collected historical operation parameters of the fault battery, wherein the historical operation parameters comprise historical operation environment parameters and historical operation key parameters, and the historical operation environment parameters comprise average operation temperature, standard deviation of temperature fluctuation and average humidity; determining target pre-pressing pressure and pressure maintaining duration of the target battery according to the battery depreciation degree value of the fault battery; The target battery is pressed to be at a preset position to a preset height according to the target pre-pressing pressure and the pressure maintaining time, and the overall internal resistance of the current battery core is measured; and determining whether the press-fitting is completed or not based on the overall internal resistance of the current battery core so as to perform packaging when the press-fitting is completed. With reference to the first aspect, in an implementation manner, the calculating, according to the collected historical operation parameters of the faulty battery, a battery depreciation degree value of the faulty battery includes: Acquiring a preset battery depreciation degree formula; And calculating a battery depreciation degree value of the fault battery according to the preset battery depreciation degree formula, the historical operation environment parameter and t