Coolant degassing device and fuel cell stack
By designing a coolant degassing device including a coolant degassing joint, a carrier plate and a first isolation plate, the problem of easy damage and difficulty in large inclination of the coolant degassing device in the prior art is solved, and high electrical isolation and stable operation are achieved.
Patent Information
- Application Number
- CN202411879358.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-19
- Filing Date
- 2024-12-19
- Publication Date
- 2025-06-20
AI Technical Summary
The coolant degassing devices in existing fuel cell stacks are susceptible to mechanical damage and are difficult to achieve large inclined operation angles, while lacking high electrical isolation performance.
A coolant degassing device is designed, which includes a coolant degassing joint having a coolant degassing joint passage, a carrier plate and a first isolation plate. The first isolation plate is mechanically coupled with the carrier plate, limits the transfer of external mechanical force to the isolation plate, and guides the coolant to the coolant degassing joint through the first isolation plate passage.
The vulnerable first isolation plate is effectively protected from direct transmission of force to the plate, ensuring the stability of the device at a large inclined operating angle, and providing high electrical isolation performance.
Smart Images
Figure CN120184282A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a coolant degassing device for degassing a coolant and a fuel cell stack including such a coolant degassing device. Background Art
[0002] It is known that in a fuel cell stack cooling circuit, degassing of the coolant is important for ensuring a large amount of heat transfer to the coolant. In a typical fuel cell stack that requires degassing, a separate tube must be inserted from the fluid port adapter side until the top of the coolant header after assembly to suck out bubbles using a siphon and provide a degassing chamber. Usually, a degassing channel perpendicular to the fuel cell stacking direction and led out from the separator side is used. Such degassing connections located on the separator side are vulnerable to mechanical damage. Summary of the Invention
[0003] The object of the present invention is to overcome the above disadvantages at least in part. In particular, the object of the present invention is to provide a coolant degassing device that limits the transfer of external mechanical forces to the separator of the coolant degassing device and allows the fuel cell stack to have a large tilting operation angle. It is also intended to provide a coolant degassing device that can provide high electrical isolation performance.
[0004] The above problems are solved by a coolant degassing device having the features of claim 1 and a fuel cell stack having the features of claim 13. Other features and details of the present invention come from the dependent claims, the description and the drawings. The features and details described regarding the coolant degassing device of the present invention naturally also apply to the fuel cell stack according to the present invention, and vice versa. Therefore, the disclosure of each aspect of the present invention can always or can be mutually referred to.
[0005] According to the present invention, there is provided a coolant degassing device for degassing a coolant. The coolant degassing device includes a coolant degassing joint having a coolant degassing joint channel for degassing the coolant, a carrier plate for holding the coolant degassing joint, and a first separator for electrical isolation relative to the fuel cell stack body, wherein the first separator and the carrier plate are mechanically coupled to each other, and wherein the first separator includes a first separator channel for guiding the coolant from the cooling circuit of the fuel cell stack body to the coolant degassing joint channel.
[0006] As described above, the first separator and the carrier plate are mechanically coupled to each other, and the carrier plate holds the coolant degassing joint. Therefore, the mechanical force applied to the coolant degassing joint is not directly applied to the first separator. The mechanical force applied to the coolant degassing joint is first transmitted to the carrier plate. Then, the mechanical force is transmitted from the carrier plate to the first separator. Therefore, the external mechanical force is restricted from entering the first separator in a small-range concentrated manner.
[0007] If a load is applied to the coolant degassing joint, the vulnerable first separator plate is protected because the force is directly transmitted to the mating carrier plate. One advantage of the present invention is to avoid force transmission to the first separator plate. The carrier plate mechanically supports the coolant degassing joint while allowing the coolant degassing joint to be sealed relative to the first separator plate without the first separator plate providing mechanical support.
[0008] Since the coolant and hydrogen flow within the first separator plate, it is important that the design of the coolant degassing device prevents any stress cracking or damage to the first separator plate.
[0009] The phrase "coolant degassing" particularly refers to the degassing of coolant gas, but it may also mean that not only the gas is degassed, but also a small portion of the liquid coolant may be degassed. The same interpretation applies to the phrase "guiding coolant from...".
[0010] According to one aspect of the coolant degassing device, the first separator plate channel has a first separator plate channel inlet and a first separator plate channel outlet, wherein the first separator plate channel inlet is arranged close to the fuel cell stack, the first separator plate channel outlet is arranged close to the coolant degassing joint, wherein the first separator plate channel is arranged substantially in a straight line from the first separator plate channel inlet towards the first separator plate channel outlet, and wherein the first separator plate channel outlet is connected to the coolant degassing joint channel.
[0011] The first separator plate channel is arranged substantially in a straight line. Therefore, even when the fuel cell stack is tilted, the bubbles in the coolant will rise. This is because even when the fuel cell stack is tilted, the first separator plate channel has no downward portion. Therefore, the present invention allows the fuel cell stack to achieve a large tilt operation angle in any axial direction, and the angle can be positive or negative.
[0012] The first separator plate channel outlet is connected to the coolant degassing joint channel, which means that the first separator plate channel outlet is in fluid communication with the coolant degassing joint channel. The first separator plate channel outlet can also be the inlet of the coolant degassing joint channel.
[0013] The expression "the first separator plate channel inlet is arranged close to the fuel cell stack" means that the first separator plate channel inlet is located on the side of the first separator plate close to the fuel cell stack. The expression "the first separator plate channel outlet is arranged close to the coolant degassing joint" means that the first separator plate channel outlet is located on the side of the first separator plate close to the coolant degassing joint.
[0014] According to another aspect of the coolant degassing device, the first separator plate channel has a tapered portion, wherein the cross-sectional area of the first separator plate channel is the largest at the first separator plate channel inlet. Due to the tapered portion, the bubbles in the coolant can be easily captured. Therefore, a large tilt operation angle of the fuel cell stack is possible.
[0015] According to another aspect of the coolant degassing device, the coolant degassing joint axis is parallelly offset relative to the first separator plate channel inlet axis. The term "parallel offset" means that the coolant degassing joint channel axis can be offset relative to the first separator plate channel inlet axis. This means that the first separator plate channel inlet can be offset relative to the coolant degassing joint channel, where the first separator plate channel inlet axis refers to a line perpendicular to the first separator plate channel inlet plane and passing through the opening point of the first separator plate channel inlet.
[0016] According to another aspect of the coolant degassing device, the coolant degassing joint can be removed from the carrier plate. This has the advantage that the coolant degassing joint can be easily replaced.
[0017] According to another aspect of the coolant degassing device, the carrier plate has a channel hole with a channel hole wall, and the coolant degassing joint is arranged in the channel hole. Due to the channel hole, the coolant can be guided through the carrier plate. There is no need for a coolant channel on the carrier plate side that may be easily damaged.
[0018] According to another aspect of the coolant degassing device, the coolant degassing joint has a protruding portion, and the carrier plate has a protruding portion protruding into the channel hole from the channel hole wall, and the protruding portion of the coolant degassing joint and the protruding portion of the carrier plate abut against each other.
[0019] Therefore, the external mechanical force acting on the coolant degassing joint is transmitted to the carrier plate. Then, the force is transmitted from the load plate to the first separator plate. However, the external mechanical force is not applied to the connection between the coolant degassing joint and the first separator plate. Therefore, there is no risk of damage to the first separator plate caused by the connection or the coolant degassing joint.
[0020] Therefore, the external mechanical force acting on the coolant degassing joint is restricted from being transmitted to the first separator plate. Thus, the first separator plate is not easily damaged mechanically.
[0021] The protruding portion of the coolant degassing joint can be a flange portion of the coolant degassing joint, and the protruding portion of the carrier plate can be a flange portion of the carrier plate.
[0022] According to another aspect of the coolant degassing device, the coolant degassing device includes a retaining ring and a wave spring washer, where the channel hole wall has a recess, the retaining ring is arranged in the recess, and the wave spring washer is arranged between the retaining ring and the protruding portion of the coolant degassing joint.
[0023] Due to this arrangement, the coolant degassing joint is detachable. Since the retaining ring is arranged in the recess and cannot move, the wave spring washer exerts a force on the protruding part of the coolant degassing joint. Therefore, the protruding parts of the coolant degassing joint and the carrier plate abut against each other.
[0024] According to another aspect of the coolant degassing device, the coolant degassing device includes two O-rings. The first separator plate has a recess with a concave wall, and the coolant degassing joint is partially disposed in the recess. These two O-rings are arranged between the concave wall and the coolant degassing joint. The double O-ring design provides a large enough creepage path to ensure no significant loss of electrical isolation. There is only mechanical contact between the O-ring and the first separator plate and between the O-ring and the coolant degassing joint. There is no direct contact between the coolant degassing joint and the first separator plate. According to another aspect of the coolant degassing device, the coolant degassing joint and the first separator plate do not directly abut against each other. This has the advantage that the coolant degassing joint always remains centered within the first separator plate port, including during thermal expansion and contraction of the first separator plate.
[0025] According to another aspect of the coolant degassing device, the coolant degassing device includes one or more flow control valves, wherein at least one flow control valve is arranged in the first separator plate channel or the coolant degassing joint channel. Therefore, the coolant can flow through the coolant degassing device in a continuous or intermittent manner.
[0026] Furthermore, according to the present invention, a fuel cell stack is described. The fuel cell stack includes the coolant degassing device as described above, a fuel cell stack body including one or more individual cell units, and a bottom device including a second separator plate and an end plate.
[0027] The individual cell units in the fuel cell stack body can be vertically stacked on top of each other. The individual cell units can be components of fuel cells or electrolyzers based on proton exchange membrane (PEM) technology, solid oxide cell (SOC) technology, or other similar technologies.
[0028] The fuel cell stack body includes a cooling circuit connected to the first separator plate channel. This means that the cooling circuit is in fluid communication with the first separator plate channel. Furthermore, due to the presence of the first separator plate and the second separator plate, the fuel cell stack body is electrically isolated.
[0029] According to one aspect of the fuel cell stack, the fuel cell stack includes a cooling circuit, the cooling circuit including a coolant inlet channel, a coolant outlet channel, and one or more coolant cross-flow channels for cooling the individual cell units, wherein the one or more coolant cross-flow channels connect the coolant inlet channel to the coolant outlet channel, and wherein the coolant inlet channel or the coolant outlet channel is connected to the first separator plate channel.
[0030] Since the cooling circuit is connected to the first separator plate channel, degassing of the coolant can be achieved.
[0031] Specifically, the fuel cell stack body of the fuel cell stack includes the cooling circuit.
[0032] The statement that "the coolant inlet channel or the coolant outlet channel is connected to the first separator plate channel" means that the coolant inlet channel or the coolant outlet channel is in fluid communication with the first separator plate channel.
[0033] According to another aspect of the fuel cell stack, the fuel cell stack includes a plurality of disc springs, and the coolant degassing joint is arranged between the disc springs. This means that the coolant degassing joint can be arranged centrally between the disc springs. Therefore, the unused space between the disc springs is used to guide the gaseous coolant to discharge from the coolant degassing device and the fuel cell stack. Description of the Drawings
[0034] Other advantages, features, and details of the present invention can be learned from the following description that describes the embodiments of the present invention in detail with reference to the drawings. The drawings include:
[0035] Figure 1 is a perspective view of the fuel cell stack,
[0036] Figure 2 is Figure 1 a cross-sectional schematic view of the shown coolant degassing device,
[0037] Figure 3 is Figure 1 a perspective view of the fuel cell stack of, and a partial exploded view of the coolant degassing device,
[0038] Figure 4 is along Figure 1 a cross-sectional schematic view of the fuel cell stack in the length direction of, showing the directional flow of the coolant,
[0039] Figure 5 is along Figure 1 another cross-sectional schematic view of the fuel cell stack in the length direction of, showing the directional flow of the coolant,
[0040] Figure 6 is along Figure 1 a cross-sectional schematic view of the fuel cell stack in the width direction of, showing the directional flow of the coolant,
[0041] Figure 7 is along Figure 1 another cross-sectional schematic view of the fuel cell stack in the width direction of, showing the directional flow of the coolant. Detailed Description of the Embodiments
[0042] Figure 1A perspective view of the fuel cell stack 100 is shown. Among other components, the fuel cell stack 100 includes a coolant degassing device 10 and a fuel cell stack body 50. The fuel cell stack body 50 has one or more individual battery cells. Additionally, the first separator plate 40 and the carrier plate 30 can be seen in Figure 1 as well.
[0043] Figure 2 is shown Figure 1 A cross-sectional schematic view of the coolant degassing device 10 shown is presented. The coolant degassing device 10 includes a coolant degassing joint 20, a carrier plate 30, and a first separator plate 40. The coolant degassing joint 20 has a coolant degassing joint passage 22 for coolant degassing. The carrier plate 30 is used to hold the coolant degassing joint 20. Furthermore, the first separator plate 40 is used to electrically isolate the fuel cell stack body 50 relative to the carrier plate 30. The first separator plate 40 and the carrier plate 30 are mechanically coupled to each other. As can be seen in Figure 2 the first separator plate 40 includes a first separator plate passage 42, wherein the first separator plate passage 42 is used to guide the coolant from the cooling circuit of the fuel cell stack body 50 to the coolant degassing joint passage 22. Thus, the first separator plate passage 42 can guide the coolant from the fuel cell stack body 50 to the coolant degassing joint passage 22.
[0044] Since the carrier plate 30 holds the coolant degassing joint 20, and the carrier plate 30 and the first separator plate 40 are also mechanically coupled to each other, the force acting on the coolant degassing joint 20 is not directly transmitted to the first separator plate 40. Therefore, any external mechanical load applied to the coolant degassing joint 20 is not directly transmitted to the vulnerable first separator plate 40. As can be seen in Figure 2 the first separator plate passage 42 has a first separator plate passage inlet 44 and a first separator plate passage outlet 46. The first separator plate passage inlet 44 is arranged on the side of the first separator plate 40 close to the fuel cell stack body 50, and the first separator plate passage outlet 46 is arranged on the side of the first separator plate 40 close to the coolant degassing joint 20. Additionally, the first separator plate passage 42 can be arranged substantially linearly from the first separator plate passage inlet 44 to the first separator plate passage outlet 46. The first separator plate passage outlet 46 is in fluid communication with the coolant degassing joint passage 22. This allows the coolant to flow into the coolant degassing joint passage 22 through the first separator plate passage outlet 46.
[0045] The first separator plate passage 42 is arranged linearly to form a passage, and even when the fuel cell stack 100 is tilted, the various parts of the passage will not trap the coolant internal gas. Therefore, the bubbles in the coolant can always rise to the coolant degassing joint passage 22.
[0046] The first separator channel 42 may have a tapered portion 48. Accordingly, the cross-sectional area of the first separator channel 42 is the largest at the first separator channel inlet 44. Thus, even when the fuel cell stack 100 is tilted, the coolant bubbles can easily flow into the first separator channel 42.
[0047] As can be seen in Figure 2 the first separator channel outlet 46 is not higher than the first separator channel inlet 44. There is a dislocation between the first separator channel outlet 46 and the first separator channel inlet 44.
[0048] The carrier plate 30 has a channel hole 32, and the coolant degassing joint 20 is arranged in the channel hole 32. Additionally, the coolant degassing joint 20 has a protruding portion 24. The carrier plate 30 also has a protruding portion 34 that protrudes into the channel hole 32 from the channel hole wall 36. As can be seen in Figure 2 the protruding portion 24 of the coolant degassing joint 20 and the protruding portion 34 of the carrier plate 30 are in contact with each other.
[0049] Furthermore, the coolant degassing device 10 may include a retaining ring 26 and a wave spring washer 28. The channel hole wall 36 may have a recess 38, and the retaining ring 26 can be placed in the recess 38. This means that the wave spring washer 28 can be arranged between the retaining ring 26 and the protruding portion 24 of the coolant degassing joint 20.
[0050] Since the retaining ring 26 and the wave spring washer 28 are detachable, the coolant degassing joint 20 can also be removed from the carrier plate 30.
[0051] The force acting on the coolant degassing joint 20 can be transmitted to the carrier plate 30 through the protruding portion 24 of the coolant degassing joint 20 and the protruding portion 34 of the carrier plate 30.
[0052] As can be seen in Figure 2 the coolant degassing device 10 of the fuel cell stack 100 includes a number of disc springs 12, and the coolant degassing joint 20 is arranged between these disc springs 12. This means that the unused space between the disc springs 12 is used for coolant degassing.
[0053] As can be seen in Figure 2As can be seen, the coolant degassing device 10 includes a first O-ring 16 and a second O-ring 14. The first separator plate 40 has a recess 90 with a concave wall 92, wherein the coolant degassing joint 20 can be partially inserted into the recess 90. Both of the O-rings 14, 16 can be arranged between the concave wall 92 and the coolant degassing joint 20. Due to the O-rings 14, 16, the coolant degassing joint 20 and the first separator plate 40 do not directly abut against each other. Therefore, these two O-rings 14, 16 contribute to electrical isolation by extending the creepage path from the energized coolant circuit to the electrical safety connection hardware components.
[0054] Optionally, the coolant degassing device 10 may include a flow control valve 18. As can be seen in Figure 2 the flow control valve 18 is arranged in the first separator plate channel 42. Alternatively, the flow control valve 18 can be arranged within the coolant degassing joint channel 22. Figure 3 Shown Figure 1 is a perspective view of the fuel cell stack 100, and a partial exploded view of the coolant degassing device 10. Figure 3 Shown are the fuel cell stack body 50, the carrier plate 30, and the first separator plate 40. The fuel cell stack 100 also includes a bottom device 80. The bottom device 80 includes a second separator plate 60 and an end plate 70. The fuel cell stack body 50 is arranged between the two separator plates 40, 60.
[0055] Shown in the exploded view are the retaining ring 26, the wave spring washer 28, the coolant degassing joint 20, the first O-ring 16, and the second O-ring 14 of the coolant degassing device 10.
[0056] Figure 4 Shown along Figure 1 is a schematic cross-sectional view of the fuel cell stack 100 in the longitudinal direction. The coolant circuit of the fuel cell stack body 50 is schematically shown by arrows. The coolant circuit includes a coolant inlet channel 110, a coolant outlet channel 120, and one or more coolant cross-flow channels 112 for cooling individual battery cells. The one or more coolant cross-flow channels 112 connect the coolant inlet channel 110 to the coolant outlet channel 120. Figure 4 Only two of the one or more coolant cross-flow channels 112 are shown therein. The coolant enters the coolant circuit via the coolant inlet channel 110 at the bottom device 80. The coolant leaves the coolant circuit via the coolant outlet channel 120 at the bottom device 80. As the coolant flows out at the coolant outlet channel 120 next to the coolant degassing device 10, the bubbles entrained in the coolant leave the coolant circuit. This is because the coolant outlet channel 120 is connected to the first separator plate channel 42. Additionally, the coolant inlet channel 110 can be connected to the first separator plate channel 42.
[0057] Due to the above arrangement of the coolant degassing device 10, the fuel cell stack 100 can operate at an inclined angle α. In Figure 4 the fuel cell stack 100 is inclined to the left along its short side. The angle α can have a wide range, preferably in the range of 0° to 60°, more preferably in the range of 0° to 45°.
[0058] Figure 5 Shows another cross-sectional schematic view along the Figure 1 length direction of the fuel cell stack 100. In Figure 5 the fuel cell stack 100 is inclined to the right along its short side. The angle α can have a wide range, preferably in the range of 0° to 60°, more preferably in the range of 0° to 45°.
[0059] Figure 6 Shows another cross-sectional schematic view along the Figure 1 width direction of the fuel cell stack 100. In Figure 6 the fuel cell stack 100 is inclined to the right along its long side. The angle α can have a wide range, preferably in the range of 90° to 30°, more preferably in the range of 90° to 45°.
[0060] Figure 7 Shows another cross-sectional schematic view along the Figure 1 width direction of the fuel cell stack 100. In Figure 7 the fuel cell stack 100 is inclined to the left along its long side. The angle α can have a wide range, preferably in the range of 90° to 30°, more preferably in the range of 90° to 45°.
[0061] The above description of the drawings only exemplarily describes the present invention.
[0062] List of reference numerals
[0063] 10 Coolant degassing device
[0064] 12 Belleville spring
[0065] 14 Second O-ring
[0066] 16 First O-ring
[0067] 18 Flow control valve
[0068] 20 Coolant degassing joint
[0069] 22 Coolant degassing joint channel
[0070] 24 Protruding part of the coolant degassing joint
[0071] 26 Retaining ring
[0072] 28 Wave spring washer
[0073] 30 Carrier plate
[0074] 32 Channel hole
[0075] 34 Protrusion of the carrier plate
[0076] 36 Channel hole wall
[0077] 38 Recess of the channel hole wall
[0078] 40 First separator
[0079] 42 First separator channel
[0080] 44 First separator channel inlet
[0081] 46 First separator channel outlet and coolant degassing channel inlet
[0082] 48 Conical portion of the first separator channel
[0083] 50 Fuel cell stack
[0084] 60 Second separator
[0085] 70 End plate
[0086] 80 Bottom device
[0087] 90 Recess of the first separator
[0088] 92 Recess wall of the first separator
[0089] 100 Fuel cell stack
[0090] 110 Coolant inlet channel
[0091] 112 Coolant cross-flow channel
[0092] 120 Coolant outlet channel
Claims
1. A coolant degassing device (10) for degassing a coolant, characterized in that: The coolant degassing device comprises: a coolant degassing connection (20) having a coolant degassing connection channel (22) for degassing the coolant, - a carrier plate (30) for holding the coolant degassing connection (20), and - a first isolation plate (40) for achieving electrical isolation relative to the fuel cell stack (50), The first isolation plate (40) and the supporting plate (30) are mechanically connected to each other, and the first isolation plate (40) includes a first isolation plate channel (42) for guiding coolant from the cooling circuit of the fuel cell stack (50) to the coolant degassing joint channel (22).
2. The coolant degassing device (10) according to claim 1, characterized in that: The first isolation plate channel (42) has a first isolation plate channel inlet (44) and a first isolation plate channel outlet (46), wherein the first isolation plate channel inlet (44) is arranged close to the fuel cell stack (50), and the first isolation plate channel outlet (46) is arranged close to the coolant degassing joint (20), wherein the first isolation plate channel (42) is arranged roughly in a straight line from the first isolation plate channel inlet (44) toward the first isolation plate channel outlet (46), and wherein the first isolation plate channel outlet (46) is connected to the coolant degassing joint channel (22).
3. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The first partition plate channel (42) has a tapered portion (48), wherein a cross-sectional area of the first partition plate channel (42) is greatest at the first partition plate channel inlet (44).
4. The coolant degassing device (10) according to claim 2, characterized in that: The axis of the coolant degassing joint channel (22) is parallel and offset relative to the axis of the first partition plate channel inlet (44).
5. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The coolant degassing connector (20) is detachable from the carrier plate (30).
6. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The carrier plate (30) has a passage hole (32) with a passage hole wall (36), wherein the coolant degassing connection (20) is arranged in the passage hole (32).
7. The coolant degassing device (10) according to claim 6, characterized in that: The coolant degassing connector (20) has a protrusion (24), wherein the carrier plate (30) has a protrusion (34) protruding from the channel hole wall (36) into the channel hole (32), wherein the protrusion (24) of the coolant degassing connector (20) and the protrusion (34) of the carrier plate (30) abut against each other.
8. The coolant degassing device (10) according to claim 6, characterized in that: The coolant degassing device (10) comprises a retaining ring (26) and a wave spring washer (28), wherein the channel hole wall (36) has a recess (38), and the retaining ring (26) is placed in the recess (38), and wherein the wave spring washer (28) is arranged between the retaining ring (26) and the protruding portion (24) of the coolant degassing joint (20).
9. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The coolant degassing device (10) comprises two O-rings (14, 16), the first separating plate (40) has a recess (90) with a recessed wall (92), the coolant degassing connector (20) is partially arranged in the recess (90), and the two O-rings (14, 16) are arranged between the recessed wall (92) and the coolant degassing connector (20).
10. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The coolant degassing joint (20) and the first isolation plate (40) do not directly abut against each other.
11. The coolant degassing device (10) according to claim 1 or 2, characterized in that: The coolant degassing device (10) comprises one or more flow control valves (18), wherein at least one flow control valve (18) is arranged in the first isolation plate channel (42) or the coolant degassing joint channel (22).
12. A fuel cell stack (100), characterized in that it have: - a coolant degassing device (10) according to any one of the preceding claims, - a fuel cell stack (50) comprising one or more individual battery cells, and - A bottom device (80) comprising a second insulating plate (60) and an end plate (70).
13. The fuel cell stack (100) according to claim 12, characterized in that: The fuel cell stack (100) includes a cooling circuit, which includes a coolant inlet channel (110), a coolant outlet channel (120) and one or more coolant cross-flow channels (112) for cooling the individual battery cells, wherein the one or more coolant cross-flow channels (112) connect the coolant inlet channel (110) to the coolant outlet channel (120), and wherein the coolant inlet channel (110) or the coolant outlet channel (120) is connected to the first isolation plate channel (42).
14. The fuel cell stack (100) according to claim 12 or 13, characterized in that: The fuel cell stack (100) comprises a plurality of disc springs (12), and the coolant degassing joint (20) is arranged between the disc springs (12).