公开(公告)号：EP2831491A1

公开(公告)日：2015-02-04

申请号：EP13704435.0

申请日：2013-02-14

申请人： Bayerische Motorenwerke Aktiengesellschaft

发明人： BRUNNER, Tobias ,  TOLOSA, Manuel

IPC分类号： F17C7/00

CPC分类号： F17C7/00 ,  F17C1/00 ,  F17C2203/0391 ,  F17C2203/0629 ,  F17C2221/012 ,  F17C2223/0115 ,  F17C2223/035 ,  F17C2225/035 ,  F17C2227/0306 ,  F17C2227/0309 ,  F17C2227/0369 ,  F17C2227/047 ,  F17C2250/043 ,  F17C2250/0439 ,  F17C2250/0626 ,  F17C2250/0631 ,  F17C2250/072 ,  F17C2270/0178 ,  F17C2270/0184 ,  Y02E60/321

摘要： The invention relates to an operating method for a cryopressure tank in which cryogenic hydrogen for supplying a motor vehicle fuel cell can be stored under supercritical pressure at 13 bar or more. In order to compensate the pressure drop resulting from the removal of hydrogen from the cryopressure tank, either a heat-transfer agent is supplied to a heat exchanger provided in the cryopressure tank via a regulating valve over a period of time which significantly exceeds the cycle times of a conventional cycle valve or the heat-transfer agent is not supplied to said heat exchanger. Depending on the fill level of the cryopressure tank, the regulating valve is actuated with respect to a desired temperature or a desired pressure of the hydrogen in the cryopressure tank. As long as there is a risk of liquefaction of the residual hydrogen in the cryopressure tank, as is the case when the temperature falls below the critical temperature of 33 K if the pressure drops below the critical pressure of approximately 13 bar, during the removal of cryogenic hydrogen from the cryopressure tank, the temperature is adjusted such that it does not drop below the critical temperature of 33 Kelvin. If the fill state in the cryopressure tank drops further, the pressure in the cryopressure tank is adjusted when there is no longer a risk of liquefaction such that the pressure does not drop below a minimum pressure value which the hydrogen that is removed from the cryopressure tank must have in order to be usable in the consumer without restricting the function thereof.

摘要翻译： 提供了一种用于冷冻压力罐的操作方法，其中用于供应机动车辆燃料电池的低温氢气可以在13巴或更高的超临界压力下储存。 为了补偿从冷冻罐中除去氢气所产生的压力下降，传热介质经由控制阀在一定时间内被供给到冷冻罐中设置的热交换器，该时间段显着地超过了 传统的循环阀或传热介质不被供应到热交换器。 取决于冷冻罐的填充水平，控制阀相对于冷冻罐中所需的温度或期望的氢气压力被致动。 只要存在冷冻罐中残留氢气液化的风险，如温度降至低于临界温度33K（如果压力低于约13巴的临界压力）的情况，则在除去 来自冷冻罐的低温氢气，调节温度使其不降至低于33开尔文的临界温度。 如果冷冻罐中的填充状态进一步下降，则当不再具有液化的风险时，调节冷冻罐中的压力，使得压力不会降低到从冷冻罐移除的氢气的最小压力值 必须具有可在消费者中使用而不限制其功能。

公开(公告)号：EP2831492A1

公开(公告)日：2015-02-04

申请号：EP13705971.3

申请日：2013-02-14

申请人： Bayerische Motorenwerke Aktiengesellschaft

发明人： BRUNNER, Tobias ,  TOLOSA, Manuel

IPC分类号： F17C13/00

CPC分类号： H01M8/04074 ,  F17C13/005 ,  F17C2221/012 ,  F17C2223/0115 ,  F17C2223/0161 ,  F17C2227/0306 ,  F17C2227/0309 ,  F17C2227/0374 ,  F17C2250/043 ,  F17C2250/0439 ,  F17C2270/0178 ,  F17C2270/0184 ,  H01M8/04029 ,  H01M8/04208 ,  H01M2250/20 ,  Y02E60/321 ,  Y02T90/32

摘要： The invention relates to an operating method for a fuel cell system, in particular in a motor vehicle, having a cooling system via which waste heat from the fuel cells of the fuel cell system is ultimately dissipated into the surrounding air, and having a tank withstanding an internal pressure of the order of magnitude of 150 bar and more, in which tank fuel for the fuel cell system is stored in the cryogenic state, in particular as a cryogen, which tank has a heat exchanger in the storage volume, via which, in order to compensate for the pressure reduction resulting from the removal of fuel from the tank, heat can be supplied to the stored fuel in a controlled manner by means of a heat exchange medium. At operating points or in operating states of the fuel cell system in which the waste heat from the fuel cells cannot be dissipated to the surroundings to the required extent, at least some of the waste heat from the fuel cells is supplied to the heat exchanger in the fuel until a predefined limiting value for the tank internal pressure is reached.