Liquid cooling machine small circulation device suitable for hydrogen fuel cell stack

By designing a two-stage plate heat exchange structure and multi-channel cascade PID fluid temperature control technology in a hydrogen fuel cell stack cooler, the problem of difficult to stabilize the glycol solution at -40°C for a long time is solved, efficient refrigeration/heat control is achieved, and long-term low-temperature testing requirements are met.

CN222688559UActive Publication Date: 2025-03-28SHANGHAI GRP TEST EQUIP
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Patent Information

Application Number
CN202421070383.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-16
Publication Date
2025-03-28
Estimated Expiration
2034-05-16

AI Technical Summary

Technical Problem

It is difficult for the hydrogen fuel cell stack cooler to stabilize the temperature of the glycol solution at -40℃ for a long time, resulting in a low return pressure of the refrigeration compressor and the inability to keep the glycol solution at a low temperature.

Method used

A small circulation device for liquid chiller is designed, using a two-stage plate heat exchange structure of refrigerant and oil plate heat exchanger and a two-stage plate heat exchanger with ethylene glycol and oil plate heat exchanger, combined with multi-channel cascade PID fluid temperature control technology to realize pre-cooling and preheating of ethylene glycol solution.

Benefits of technology

The long-term stable state of ethylene glycol solution at -40°C was achieved, which met the 8-hour test requirements, reduced the temperature loss of ethylene glycol during the heat exchange process, and improved the cooling/heating efficiency of the liquid cooler.

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Abstract

The utility model discloses a liquid cooling machine small circulation device suitable for a hydrogen fuel cell stack. The liquid cooling machine small circulation device comprises a refrigerating unit, a refrigerant and oil plate type heat exchanger, an oil path liquid supply and exhaust barrel, an ethylene glycol and oil plate type heat exchanger, a water path liquid supply and exhaust barrel and an ethylene glycol pipeline heating device, the refrigerating unit is communicated with the refrigerant and oil plate type heat exchanger through a refrigerant input / output pipe; the refrigerant and oil plate type heat exchanger and the ethylene glycol and oil plate type heat exchanger are communicated through an oil input / output pipe, and the oil input pipe is connected with an oil way liquid supply exhaust barrel. The ethylene glycol and oil plate type heat exchanger is communicated with the hydrogen fuel cell stack through an ethylene glycol input / output pipe; and an ethylene glycol pipeline heating device and a water path liquid supply exhaust barrel are respectively arranged on the ethylene glycol input pipe and the ethylene glycol output pipe. According to the liquid cooling machine small circulation device suitable for the hydrogen fuel cell stack, the quick refrigeration / heating requirement of ethylene glycol is met by utilizing two-stage plate transduction; and the problem of low air return pressure is solved by adopting a medium heat exchange mode, and the application prospect is good.
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