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CN-122025704-A - Battery pack temperature detection device for fuel cell

CN122025704ACN 122025704 ACN122025704 ACN 122025704ACN-122025704-A

Abstract

The invention belongs to the technical field of fuel cells, in particular to a battery pack temperature detection device for a fuel cell, which comprises a hydrogen fuel cell main body, wherein a liquid inlet pipe and a liquid outlet pipe are arranged on the hydrogen fuel cell main body, temperature measurement assemblies are arranged on the liquid inlet pipe and the liquid outlet pipe, and the heat quantity of the hydrogen fuel cell main body in unit operation time can be detected by measuring the flow of cooling liquid flowing through the hydrogen fuel cell main body and measuring the temperature difference of the liquid inlet pipe and the liquid outlet pipe through the two temperature measurement assemblies. According to the invention, by eliminating or greatly reducing the radial bending stress of the direct acting of the cooling liquid on the measuring rod, the characteristic drift of sensitive elements (thermocouple junctions and resistance wires) caused by the deformation of the measuring rod, the compactness change of the internal filling insulating material and the distortion of a heat conduction path are avoided, so that the temperature measurement error caused by mechanical stress is reduced to the greatest extent, and the reliability and reliability of measurement are improved.

Inventors

  • XIE DONG
  • JIA TIANWEI
  • ZHANG YANG
  • WANG HAO
  • TANG SHOUFENG
  • LIU HAI
  • SUN FENG
  • ZHAO FENG
  • LIN ZEHUI
  • ZHOU YU

Assignees

  • 徐州市检验检测中心

Dates

Publication Date
20260512
Application Date
20260226

Claims (8)

  1. 1. The battery pack temperature detection device for the fuel cell comprises a hydrogen fuel cell main body (1) and is characterized in that a liquid inlet pipe (11) and a liquid outlet pipe (12) are arranged on the hydrogen fuel cell main body (1), temperature measurement assemblies (2) are arranged on the liquid inlet pipe (11) and the liquid outlet pipe (12), and the heat productivity of the hydrogen fuel cell main body (1) in unit operation time can be detected by measuring the flow rate of cooling liquid flowing through the hydrogen fuel cell main body (1) and measuring the temperature difference of the liquid inlet pipe (11) and the liquid outlet pipe (12) through the two temperature measurement assemblies (2); The temperature measurement assembly (2) comprises a middle pipe (21) and a temperature sensor (24) arranged on the middle pipe (21), a measuring rod (25) extending into the middle pipe (21) is arranged on the temperature sensor (24), an adaptive adjusting mechanism (26) sleeved outside the measuring rod (25) is arranged in the middle pipe (21), the adaptive adjusting mechanism (26) comprises an inner cylinder (261) and an outer cylinder (262), a liquid outlet port (26 a) and a liquid inlet port (26 b) are arranged on the inner cylinder (261) and the outer cylinder (262), the opening amplitude of the liquid inlet port (26 b) is inversely proportional to the speed of the flow of the cooling liquid flowing through the middle pipe (21), and the flushing force of the cooling liquid on the measuring rod (25) can be reduced when the flow speed of the cooling liquid in the middle pipe (21) is increased by reducing the opening amplitude of the liquid inlet port (26 b); a plurality of equally spaced conical cylinders (263) are fixedly arranged in the inner cylinder (261), the conical cylinders (263) are arranged in an inverted conical shape and sleeved outside the measuring rod (25), the flowing direction of cooling liquid is changed through the plurality of conical cylinders (263), and radial impact force of the cooling liquid on the measuring rod (25) is reduced to prevent the measuring rod (25) from being deformed in the radial direction.
  2. 2. The device for detecting the temperature of the fuel cell stack according to claim 1, wherein the joint pipes (23) are arranged at both ends of the middle pipe (21), two horizontal parts (22) which are symmetrically distributed are arranged on the side surface of the middle pipe (21), and the measuring rod (25) penetrates through one horizontal part (22) to extend into the middle pipe (21) and is fixedly connected with the corresponding horizontal part (22).
  3. 3. The device for detecting the temperature of the fuel cell battery pack according to claim 1, wherein the top end of the inner cylinder (261) is fixedly connected with the inner wall of the top part of the middle pipe (21) adjacent to the temperature sensor (24), the outer cylinder (262) is rotatably sleeved outside the inner cylinder (261), two ends of the outer cylinder (262) are flush with the inner walls of the two inner cylinders (261), and a first valve plate (264) and a second valve plate (265) which are distributed in a central symmetry mode are fixedly arranged outside the outer cylinder (262).
  4. 4. The device for detecting the temperature of a fuel cell stack according to claim 1, wherein the inner tube (261) is provided with a plurality of first liquid inlets (2611) and first liquid outlets (2612) which are distributed at equal intervals, the outer tube (262) is provided with a plurality of second liquid inlets (2621) and second liquid outlets (2622) which are distributed at equal intervals, the liquid outlet (26 a) is formed by the first liquid outlets (2612) and the second liquid outlets (2622) which are communicated with each other, and the liquid inlet (26 b) is formed by the first liquid inlets (2611) and the second liquid inlets (2621) which are communicated with each other.
  5. 5. A battery pack temperature detection device for a fuel cell is characterized in that one end of an outer cylinder (262) far away from a temperature sensor (24) is provided with a reset mechanism (27), the reset mechanism (27) comprises a circular plate (273) which is embedded to rotate on the inner wall of a horizontal part (22) far away from the temperature sensor (24), the circular plate (273) is fixedly connected with the outer cylinder (262), one end of the circular plate (273) far away from the outer cylinder (262) is fixedly provided with a rotating shaft (272), the rotating shaft (272) penetrates through a corresponding horizontal part (22) in a rotating mode and extends out of a middle pipe (21), a spiral spring (274) and a shell cover (271) are sleeved on the rotating shaft (272), the top of the shell cover (271) is fixedly connected with the adjacent horizontal part (22), one end of the spiral spring (274) close to the center of a circle is fixedly connected with the side face of the rotating shaft (272), and one end of the circular shaft of the spiral spring (274) is fixedly connected with the inner wall of the shell cover (271).
  6. 6. The device for detecting the temperature of a fuel cell stack according to claim 2, wherein the bottom end of said measuring rod (25) extends to 1/2 to 1/3 of the position in said middle tube (21).
  7. 7. The device for detecting the temperature of the battery pack for the fuel cell according to claim 1, wherein the flow meter (3), the water pump (4), the thermostat (5) and the radiator (6) are connected to the hydrogen fuel cell main body (1), the flow meter (3), the water pump (4), the thermostat (5), the radiator (6) and the two temperature measuring assemblies (2) are connected in series through pipelines, and the cooling liquid in the hydrogen fuel cell main body (1) is discharged from the temperature measuring assembly (2) on the liquid outlet pipe (12) and then sequentially flows through the flow meter (3), the water pump (4), the thermostat (5), the radiator (6) and finally flows into the hydrogen fuel cell main body (1) again through the temperature measuring assembly (2) on the liquid inlet pipe (11).
  8. 8. A temperature detection device of a battery pack for a fuel cell according to claim 7, wherein an outlet of the flowmeter (3) is connected with an inlet of the water pump (4) through a pipeline, an outlet of the water pump (4) is connected with an inlet of the thermostat (5) through a pipeline, an outlet of the thermostat (5) is connected with an inlet of the radiator (6) through a pipeline, a temperature measurement component (2) on the liquid outlet pipe (12) is connected with an inlet of the flowmeter (3) through a pipeline, and a temperature measurement component (2) on the liquid inlet pipe (11) is connected with an outlet of the radiator (6) through a pipeline.

Description

Battery pack temperature detection device for fuel cell Technical Field The present invention relates to the field of fuel cells, and more particularly, to a temperature detection device for a fuel cell stack. Background The hydrogen fuel cell is a power generation device for directly converting chemical energy of fuel into electric energy, has the advantages of high energy conversion efficiency, environmental friendliness and the like, and currently, a conventional method for acquiring the heating value of the hydrogen fuel cell is to calculate based on the fuel consumption, and the other thinking is to estimate the heating value through the heat balance of a hydrogen fuel cell system. The waste heat generated by the hydrogen fuel cell is mainly dissipated by means of cooling liquid circulation, exhaust emission, radiation convection of the surface and the environment and the like. Among them, the coolant system takes on a main heat radiation task, and therefore, the heat generation amount of the hydrogen fuel cell can be obtained by calculating the amount of heat absorbed by the coolant system per unit time. In the above cooling system, the coolant pipe is a core component of the system, and accurate monitoring of the temperature of the internal medium is important. In general, a temperature sensor (such as a thermocouple, a thermal resistor and the like) is installed in a cooling liquid pipeline to acquire temperature information of cooling liquid in real time, so that accurate adjustment and safety protection of system working conditions are realized, however, in the prior art, the temperature sensor is directly exposed to the cooling liquid flowing in the pipeline, and a remarkable technical defect exists that a measuring rod of the temperature sensor is often exposed to a complex mechanical stress environment. For example, in a fluid conduit, unstable flow, vortex or pulsation can create a continuous, randomly oriented radial impact force on the sensor rod, and in a vibratory environment, mechanical vibration can be transferred to the rod, inducing lateral bending: 1. First, measurement accuracy is susceptible to interference. The sensitive core of the temperature sensor (such as thermocouple junctions or platinum resistance wires) is very sensitive to radial stresses perpendicular to the axis. The bending of the rod body caused by the radial force can lead the internal material to generate micro-strain, so that the thermoelectric potential characteristic of the thermocouple or the resistance value of the resistance wire can be changed, and temperature measurement errors which are difficult to predict and compensate are introduced. At the same time, bending can alter the ideal thermal conduction path between the sensing element and the measured medium, resulting in slow dynamic response and steady state reading bias; 2. second, mechanical reliability and lifetime are reduced. The slender rod body is easy to fatigue and bend under the action of repeated radial force, and finally the armor sleeve or the protection tube is broken at the root stress concentration position; 3. Furthermore, seal integrity is challenging. The temperature sensor is usually mounted and sealed by threaded connection, welding or flanges. Radial forces can create shear or peel stresses at the seal interface that can cause the seal to fail over time, resulting in leakage of the media. To this end, a stack temperature detection device for a fuel cell is proposed. Disclosure of Invention The invention provides a battery pack temperature detection device for a fuel cell, which aims to solve the defects in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme that the temperature detection device of the battery pack for the fuel cell comprises a hydrogen fuel cell main body, wherein a liquid inlet pipe and a liquid outlet pipe are arranged on the hydrogen fuel cell main body, temperature measurement assemblies are arranged on the liquid inlet pipe and the liquid outlet pipe, and the heat quantity of the hydrogen fuel cell main body in unit operation time can be detected by measuring the flow of cooling liquid flowing through the hydrogen fuel cell main body and measuring the temperature difference of the liquid inlet pipe and the liquid outlet pipe through the two temperature measurement assemblies; The temperature measuring assembly comprises a middle pipe and a temperature sensor arranged on the middle pipe, a measuring rod extending into the middle pipe is arranged on the temperature sensor, a self-adaptive adjusting mechanism sleeved outside the measuring rod is arranged in the middle pipe, the self-adaptive adjusting mechanism comprises an inner cylinder and an outer cylinder, a liquid outlet port and a liquid inlet port are arranged on the inner cylinder and the outer cylinder, the opening amplitude of the liquid inlet port is inversely proportional to the speed of the cooling