Electrolysis system

Abstract

The utility model provides an electrolysis system which has good safety. The electrolysis system includes: a battery unit including a plurality of unit cells, each unit cell including an electrolyte membrane, a pair of electrodes respectively disposed on opposite sides of the electrolyte membrane, and a diaphragm stacked on the electrolyte membrane and the pair of electrodes; the two end plates are respectively arranged at two opposite ends of the battery unit; the piston component is arranged between one of the two end plates and the battery unit and is used for allowing the battery unit to move along the stacking direction; the electrolysis system is provided with a communication hole, the communication hole passes through the battery unit, one of the two end plates and the piston component, the high-pressure fluid flows through the communication hole, and the electrolysis system further comprises a flow limiting part which is arranged in the communication hole and used for preventing the high-pressure fluid from flowing towards the piston component when the electrolysis system starts to perform electrolysis operation; the internal pressure of the battery cell reaches a predetermined value as the high-pressure fluid is generated on one side of the pair of electrodes.

Description

Technical Field

[0001] The utility model relates to an electrolysis system, and in particular to an electrolysis system for generating electric energy. Background Art

[0002] In recent years, in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy, research and development related to fuel cells that contribute to energy efficiency has been carried out. However, in the research and development of fuel cells, the concentration of hydrogen in oxygen is very high before the oxygen pressure increases, which raises concerns about safety. In addition, the battery cells are prone to short circuit when wet. Therefore, it is necessary to improve the fuel cell to overcome the above problems. Utility Model Content

[0003] The utility model provides an electrochemical device with good safety.

[0004] The utility model provides an electrolysis system, comprising: a battery unit, comprising a plurality of unit batteries stacked on each other along a stacking direction, each unit battery comprising an electrolyte membrane, a pair of electrodes and a diaphragm, the pair of electrodes being respectively arranged at opposite sides of the electrolyte membrane, the diaphragm being stacked on the electrolyte membrane and the pair of electrodes; two end plates, respectively arranged at opposite ends of the battery unit in the stacking direction; a piston member, arranged between one of the two end plates and the battery unit, to allow the battery unit to move along the stacking direction; and a power source, supplying current to the pair of electrodes, the electrolysis system being arranged at the pair of electrodes A high-pressure fluid is generated on one side of the pair of electrodes, and the pressure of the high-pressure fluid is higher than the pressure of the fluid flowing through the other side of the pair of electrodes. The electrolysis system has a connecting hole, which passes through the battery cell, one of the two end plates and the piston component, and the high-pressure fluid flows through the connecting hole. The electrolysis system also includes a flow limiting part, which is arranged in the connecting hole and is used to prevent the high-pressure fluid from flowing to the piston component when the electrolysis system starts to perform electrolysis operation until the internal pressure of the battery cell reaches a predetermined value as the high-pressure fluid is generated on the one side of the pair of electrodes.

[0005] In one embodiment of the present invention, when the electrolysis operation stops, the electrolysis system performs a decompression operation to reduce the internal pressure of the battery cell to below the predetermined value, and when the internal pressure of the battery cell is reduced to below the predetermined value, the flow limiting part seals the battery cell.

[0006] In one embodiment of the present invention, the electrolysis system further includes an insulating portion, which is disposed between the battery cell and the piston component to prevent the current from flowing toward the piston component, and the flow limiting portion limits the flow of the high-pressure fluid closer to the battery cell than the insulating portion.

[0007] Based on the above, the electrolysis system of the utility model is provided with a flow restriction part in the connecting hole, and the flow restriction part prevents the high-pressure fluid from flowing from the battery cell to the piston member during the electrolysis operation, so as to suppress the low-pressure side fluid from penetrating to the high-pressure side and make the internal pressure of the battery cell reach a predetermined value quickly. In this way, it can be avoided that the electrolysis operation time is too long and the battery cell is in a state of high hydrogen concentration for a long time. Therefore, the electrolysis system of the utility model has good safety.

[0008] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional schematic diagram of an electrolysis system according to an embodiment of the utility model.

[0010] Figure 2A yes Figure 1 Schematic diagram of a partial cross section of the electrolysis system.

[0011] Figure 2B Show Figure 2A The flow restriction section of the

[0012] Description of reference numerals:

[0013] 100: electrolysis system;

[0014] 110: battery unit;

[0015] 112: unit cell;

[0016] 1121: electrolyte membrane;

[0017] 1122A, 1122B: electrodes;

[0018] 1123A, 1123B: diaphragm;

[0019] 120A, 120B: end plates;

[0020] 130: piston member;

[0021] 140: communication hole;

[0022] 150: flow limiting unit;

[0023] 152: valve parts;

[0024] 154: elastic member;

[0025] 160: insulation part;

[0026] C1, C2, C3: hole part;

[0027] D: stacking direction;

[0028] F: High pressure fluid. DETAILED DESCRIPTION

[0029] Figure 1 This is a cross-sectional schematic diagram of an electrolysis system according to an embodiment of the present invention. Figure 1 The electrolysis system 100 of this embodiment is, for example, a fuel cell, which includes a battery cell 110, two end plates 120A, 120B, and a piston member 130. The battery cell 110 includes a plurality of unit cells 112 stacked one on another along a stacking direction D, and each unit cell 112 includes an electrolyte membrane 1121, a pair of electrodes 1122A, 1122B, and separators 1123A, 1123B. The electrodes 1122A and 1122B are respectively an anode and a cathode and are respectively disposed on opposite sides of the electrolyte membrane 1121, the separator 1123A is stacked on the electrolyte membrane 1121 and the electrode 1122A, and the separator 1123B is stacked on the electrolyte membrane 1121 and the electrode 1122B. The two end plates 120A and 120B are respectively disposed on opposite ends of the battery cell 110 in the stacking direction D.

[0030] The piston member 130 is disposed between the end plate 120A and the battery cell 110 to allow the battery cell 110 to move along the stacking direction D. The electrochemical device 100 has a connecting hole 140, which passes through the battery cell 110, the end plate 120A and the piston member 130. Specifically, the connecting hole 140 includes a hole portion C1 formed in the battery cell 110, a hole portion C2 formed in the end plate 120A and a hole portion C3 formed in the piston member 130. The power supply of the electrolysis system 100 supplies current to the electrodes 1122A and 1122B, so that the electrochemical device 100 generates a high-pressure fluid F (for example, hydrogen) on one side of the electrodes 1122A and 1122B. The pressure of the high-pressure fluid is higher than the pressure of the fluid on the other side of the electrodes 1122A and 1122B, and the high-pressure fluid F flows through the connecting hole 140. The detailed working mode and principle of the fuel cell are known in the art and will not be described in detail here.

[0031] Figure 2A yes Figure 1 Schematic diagram of a partial cross section of the electrolysis system. Figure 2B Show Figure 2A The flow restriction part of the Figure 2A and Figure 2BThe electrolysis system 100 of this embodiment further includes a flow limiting portion 150. The flow limiting portion 150 is disposed in the communicating hole 140 and is used to limit the flow of the electrolysis system 100 when the electrolysis system 100 starts to perform electrolysis operation. Figure 2A The seal is maintained to prevent the high pressure fluid F (shown in Figure 1 ) flows toward the piston member 130 until the internal pressure of the battery cell 110 increases as the pressure at the electrodes 1122A, 1122B (shown in FIG. Figure 1 ) generates a high-pressure fluid F on the one side and reaches a predetermined value, and the flow restriction part 150 is opened due to the internal pressure of the battery cell 110. Figure 2B Shown as actuated to non-sealed state.

[0032] As described above, the electrolysis system 100 of this embodiment is provided with a flow restriction portion 150 in the communication hole 140. The flow restriction portion 150 prevents the high-pressure fluid F from flowing from the battery cell 110 to the piston member 130 during the electrolysis operation, so as to suppress the low-pressure fluid from penetrating to the high-pressure side and make the internal pressure of the battery cell 110 quickly reach a predetermined value. In this way, it is possible to avoid the battery cell 110 being in a state of high hydrogen concentration for a long time due to the electrolysis operation time being too long. Therefore, the electrolysis system 100 of this embodiment has good safety.

[0033] In addition, when the electrolysis operation is stopped, the electrolysis system 100 performs a decompression operation to reduce the internal pressure of the battery cell 110 to below the predetermined value. And, when the internal pressure of the battery cell 110 is reduced to below the predetermined value, the flow restriction unit 150 is again Figure 2A The battery cell 110 is sealed by moving to a sealed state. Thus, the battery cell 110 can be sealed with a gas containing moisture to prevent the electrolyte membrane 1121 from being excessively dried and deteriorated.

[0034] The electrolysis system 100 of this embodiment is as follows Figure 2A and Figure 2B The insulating portion 160 is also shown, and the insulating portion 160 is disposed between the battery cell 110 and the piston member 130 to prevent the current from flowing to the piston member 130. The flow limiting portion 150 is used to limit the flow of the high-pressure fluid F closer to the battery cell 110 than the insulating portion 160. By setting the insulating portion 160, a short circuit can be avoided when the electrolysis system 100 is damp.

[0035] The following example illustrates a specific configuration of the flow restriction unit 150. Figure 2A and Figure 2BThe flow restriction part 150 of this embodiment includes a valve member 152 and an elastic member 154. The elastic member 154 is connected between the valve member 152 and the piston member 130. The valve member 152 is, for example, a ball valve and its diameter is larger than the diameter of the hole portion C1 of the communication hole 140. When the internal pressure of the battery cell 110 has not reached the predetermined value, the elastic force of the elastic member 154 is sufficient to resist the internal pressure of the battery cell 110. Figure 2A As shown in FIG. 1 , the valve member 152 is pushed toward the hole portion C1 of the communication hole 140 to seal the top of the hole portion C1 through the valve member 152. When the internal pressure of the battery cell 110 reaches the predetermined value, the internal pressure of the battery cell 110 resists the elastic force of the elastic member 154 and Figure 2B As shown, the valve member 152 is pushed upward so that the valve member 152 no longer seals the top end of the hole portion C1. In other embodiments, the flow restriction portion 150 can be configured in other forms, and the present invention is not limited thereto.

[0036] In summary, the electrolysis system of the present invention is provided with a flow restriction part in the communication hole, and the flow restriction part prevents the high-pressure fluid from flowing from the battery cell to the piston member during the electrolysis operation, so as to suppress the low-pressure fluid from penetrating to the high-pressure side and make the internal pressure of the battery cell reach a predetermined value quickly. In this way, it can be avoided that the electrolysis operation time is too long and the battery cell is in a state of high hydrogen concentration for a long time. Therefore, the electrolysis system of the present invention has good safety.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An electrolysis system, characterized in that: include: A battery unit, comprising a plurality of unit batteries stacked one on another along a stacking direction, each of the unit batteries comprising an electrolyte membrane, a pair of electrodes and a separator, the pair of electrodes being respectively arranged on opposite sides of the electrolyte membrane, and the separator being stacked on the electrolyte membrane and the pair of electrodes; Two end plates, respectively disposed at opposite ends of the battery unit in the stacking direction; a piston member disposed between one of the two end plates and the battery unit to allow the battery unit to move along the stacking direction; and a power source for supplying current to the pair of electrodes, The electrolysis system generates a high-pressure fluid on one side of the pair of electrodes, the pressure of the high-pressure fluid is higher than the pressure of the fluid flowing through the other side of the pair of electrodes, the electrolysis system has a connecting hole, the connecting hole passes through the battery cell, one of the two end plates and the piston member, and the high-pressure fluid flows through the connecting hole, The electrolysis system also includes a flow limiting portion, which is arranged in the connecting hole and is used to prevent the high-pressure fluid from flowing toward the piston component when the electrolysis system starts electrolysis operation until the internal pressure of the battery cell reaches a predetermined value as the high-pressure fluid is generated on the one side of the pair of electrodes.

2. The electrolysis system according to claim 1, characterized in that: When the electrolysis operation is stopped, the electrolysis system performs a decompression operation to reduce the internal pressure of the battery cell to below the predetermined value. The flow restriction portion seals the battery cell when the internal pressure of the battery cell decreases below the predetermined value.

3. The electrolysis system according to claim 1, characterized in that: The battery cell further comprises an insulating portion, wherein the insulating portion is disposed between the battery cell and the piston member to prevent the current from flowing to the piston member. The flow rate limiting portion limits a flow rate of the high-pressure fluid closer to the battery cell than the insulating portion.

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