燃料电池系统
By setting up a humidity sensor in the fuel cell system and linking it to the air supply system, the existing air supply system is used for dehumidification, which solves the problem of humidity affecting the insulation performance between the fuel cell stack and the stack shell, ensuring normal system startup and avoiding high-voltage system alarms and shutdowns.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ROBERT BOSCH GMBH
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-17
AI Technical Summary
The insulation performance between the fuel cell stack and the stack shell is affected by humidity, which leads to a decrease in the insulation performance of the vehicle's high-voltage system when the high-voltage relay is closed, triggering alarms and shutdowns.
A humidity sensor is installed in the fuel cell system and associated with the air supply system. When the humidity is too high, the air supply system is activated by the control unit to dehumidify, using the existing air supply system to remove moisture and ensuring that the insulation performance meets the start-up requirements.
Effectively control the insulation performance between the fuel cell stack and the stack shell to avoid high-voltage system alarms and shutdowns caused by excessive humidity, achieving a solution with minimal structural modifications and low cost.
Smart Images
Figure CN224519894U_ABST
Abstract
Claims
1. A fuel cell system (100) characterized by include: Stack shell (10), which defines an internal space (25) for accommodating the fuel cell stack (20); An air inlet (14) and an air outlet (16) pass through the stack shell (10) to allow air to enter and exit the internal space (25), respectively; An air supply system (200) is externally attached to the stack shell (10) to supply ambient air to the air inlet (14); A humidity sensor is disposed in the interior space and configured to sense the humidity value of the air in the interior space; and A control unit (300) that associates the humidity sensor with the air supply system (200) so that the air supply system (200) is activated when the humidity value is higher than a humidity threshold.
2. The fuel cell system (100) according to claim 1 further includes: An internal temperature sensor is disposed in the internal space (25) and configured to sense the internal temperature value of the air in the internal space (25); and An ambient temperature sensor is installed outside the stack shell (10) to measure the ambient temperature value.
3. The fuel cell system (100) according to claim 2, characterized in that The control unit (300) is also associated with both the internal temperature sensor and the ambient temperature sensor and is configured to heat the ambient air supplied from the air supply system (200) to the air inlet (14) and / or increase the flow rate of the supplied air when the temperature difference between the internal temperature value received from the internal temperature sensor and the ambient temperature value received from the ambient temperature sensor is less than a temperature threshold.
4. The fuel cell system (100) according to claim 3, characterized in that Any one of the following: The humidity sensor and the internal temperature sensor are integrated into a single sensing unit (50) or both are provided independently. The humidity sensor and / or the internal temperature sensor are directly or indirectly attached to the stack housing (10); The humidity sensor and / or the internal temperature sensor are located inside the stack housing (10) on the side opposite to the air inlet (14).
5. The fuel cell system (100) according to claim 3 further includes a heater (210) for heating air entering the interior space (25).
6. The fuel cell system (100) according to claim 5, characterized in that The heater (210) is located in: a duct of the air supply system (200) communicating with the air inlet (14); or inside the air inlet (14); or in the interior space (25) near the air inlet (14).
7. The fuel cell system (100) according to claim 1 further includes insulating components (30, 40) located between the fuel cell stack (20) and the stack housing (10) within the stack housing (10).
8. The fuel cell system (100) according to any one of claims 1-7, further comprising: A power conversion unit (700) has an input side for electrical connection to the fuel cell stack (20) and an output side for electrical connection to the input side and for electrical connection to an electrical device; and The positive main relay (510) and the precharge relay (520) are electrically connected in parallel to each other and to the positive wire on the input side.
9. The fuel cell system (100) according to claim 8, characterized in that, The electrical equipment mentioned is a power battery (500). The air supply system (200) includes an electric air compressor (EAC) which is directly electrically connected to both the output side of the power conversion unit (700) and the power battery (500) to be powered by the power battery (500).
10. The fuel cell system (100) according to any one of claims 1-7, characterized in that, The air supply system (200) is also configured to supply air to the interior space (25) and / or to supply ambient air to the cathode chambers of each cell in the fuel cell stack (20) during fuel cell operation; or The fuel cell system (100) also includes the fuel cell stack (20).