High-power hydrogen fuel cell with electric pile protection system

Abstract

The invention relates to the technical field of fuel cells, in particular to a high-power hydrogen fuel cell with an electric pile protection system, the high-power hydrogen fuel cell comprises two inner end plates, a cell frame and a spacing regulator, the cell frame and the spacing regulator are stacked between the two inner end plates, a cell unit is arranged in the cell frame, a scissor-type structure is arranged between the two inner end plates, and the spacing regulator is arranged between the two inner end plates. The shear fork type structure is provided with connecting pins capable of extending and retracting at equal intervals, the connecting pins are connected with the battery frames, and when the two inner end plates are close to or far away from each other, the abutting force between the adjacent battery frames is increased along with the approaching of the two inner end plates and is reduced along with the far away of the two inner end plates; the spacing adjuster is provided with two adjusting plates which are respectively connected with the two inner end plates, the battery frames provided with the battery units are stacked between the two inner end plates, and the pressure of the adjacent battery frames is adjusted through the scissor-type structures arranged on the two inner end plates, so that the problems that the local stress of the existing hydrogen fuel battery is concentrated, and the pressure of the adjacent battery frames is reduced are solved. And the battery performance is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a high-power hydrogen fuel cell with a stack protection system. Background Art

[0002] As a highly efficient electrochemical energy conversion device, the core structure of a hydrogen fuel cell consists of multiple single cells connected in series to form a stack. During long-term operation, due to factors such as material creep, uneven distribution of mechanical stress, and differences in thermal expansion coefficients, the stack structure is prone to deformation, mainly manifested as compression deformation (collapse) and lateral bending deformation (deflection). This structural deformation will lead to uneven distribution of contact pressure inside the battery, which in turn affects the contact resistance between the gas diffusion layer and the bipolar plate, and ultimately leads to battery performance degradation.

[0003] Patent document publication number CN114447392B discloses a hydrogen fuel cell stack protection system, comprising two end plates and a plurality of battery cells arranged between the two end plates, a plurality of first frames and second frames distributed in an alternating manner are arranged between the two end plates, the battery cells are respectively fixed on the inner sides of the first frames and the second frames to form an assembly, by arranging a pressurizing propulsion mechanism on the side wall of the end plate and arranging a steering expansion support mechanism on one side of the assembly, the packaging pressure between two adjacent battery cells can be adjusted, and by arranging an inclined panel between the insulating plate and the outer end plate, the distance between the end plates at both ends can be changed.

[0004] The protection system drives the second frame to rotate through the fan-shaped piston, but there may be a deviation between the force application point of the fan-shaped piston and the center of mass of the second frame, resulting in further imbalance in the pressure distribution between the upper and lower parts during rotation. This uneven pressure distribution may aggravate the local stress concentration of the battery cell and affect battery performance. In addition, the rotational movement of the second frame may be affected by the asymmetry of the mechanical structure, such as the uneven distribution of friction at the connection between the shaft and the frame, which further aggravates the difference in pressure between the upper and lower parts. Summary of the invention

[0005] In view of the problems existing in the prior art, a high-power hydrogen fuel cell with a stack protection system is provided. The battery frames equipped with battery cells are stacked between two inner end plates, and the pressure between adjacent battery frames is dynamically adjusted by a scissor-type structure installed on the two inner end plates. This effectively solves the problem of battery performance degradation caused by local stress concentration in existing hydrogen fuel cells.

[0006] To solve the problems of the prior art, the present invention provides a high-power hydrogen fuel cell with a stack protection system, comprising two inner end plates and a battery frame stacked between the two inner end plates and a spacing adjuster for adjusting the spacing between the two inner end plates, wherein a battery unit is arranged in the battery frame, a scissors-type structure is arranged between the two inner end plates, the scissors-type structure has connecting pins that can equidistantly telescopically move, the connecting pins are connected to the battery frame, when the two inner end plates approach or move away, the abutment force between adjacent battery frames increases as the two inner end plates approach and decreases as the two inner end plates move away; the spacing adjuster has two adjustment plates respectively connected to the two inner end plates, and the two adjustment plates can drive the inner end plates connected thereto to move synchronously.

[0007] Preferably, the adjustment plate is elastically connected to its adjacent inner end plate, and when the two adjustment plates are moved away from each other, the pressure on the two inner end plates toward the adjustment plate side decreases, and when the two adjustment plates are moved closer, the pressure on the two inner end plates toward the adjustment plate side increases.

[0008] Preferably, it also includes two outer end plates, the inner end plate and the battery frame are located between the two outer end plates, and a positioning rod is provided between the two outer end plates to laterally connect the two outer end plates. The positioning rod passes through the inner end plate and the battery frame and slides with them.

[0009] Preferably, a connecting sleeve extending along the thickness direction is provided on the inner end plate, the connecting sleeve passes through the adjustment plate and slides with it, a limiting ring is provided at one end of the connecting sleeve close to the adjustment plate, and a pre-tightening elastic element is also provided on the connecting sleeve between the adjustment plate and the inner end plate.

[0010] Preferably, the connecting sleeve is sleeved on the positioning rod and slidably matched therewith.

[0011] Preferably, the spacing adjuster also includes a driving plate capable of moving vertically on the battery frame and a driving block linked with the driving plate and located on the outside of the adjusting plate. A driven block is provided on the side of the adjusting plate facing the driving block. The driven block and the driving block are slidably matched and the sliding contact surface is inclined. When the driving block moves downward, the driven block drives the adjusting plate away from the inner end plate.

[0012] Preferably, a positioning seat is provided at the top of the outer end plate, and a polished rod is provided on the positioning seat for sliding cooperation in the vertical direction, the top of the polished rod is fixedly connected to the end of the driving plate, and the bottom of the polished rod is fixedly connected to the driving block.

[0013] Preferably, a reset elastic element is sleeved on the polished rod, and the elastic reset element is located between the positioning seat and the driving seat.

[0014] Preferably, an oblique groove is provided at one end of the driving block facing the adjusting plate, and an oblique block is provided at a side of the driven block facing away from the adjusting plate, and the oblique groove and the oblique block are slidably matched.

[0015] Preferably, the position of the battery frame at the center is fixed, and both ends of the scissor-type structure have driving pins rotatably connected to the inner end plates.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The isometric telescopic characteristics of the scissor-type structure in this application ensure that the abutment force between the battery frames is evenly distributed during the compression process of the battery stack, effectively avoiding the phenomenon of local stress concentration and improving the structural stability and reliability of the battery stack. The spacing regulator achieves precise control of the spacing between the inner end plates through the synchronously moving adjustment plate, thereby dynamically adjusting the overall compression force of the battery stack, ensuring that the battery unit operates at the optimal working pressure and extending the battery life.

[0017] By stacking the battery frame equipped with battery cells between two inner end plates and using the scissor-type structure installed on the two inner end plates to dynamically adjust the pressure between adjacent battery frames, the problem of battery performance degradation caused by local stress concentration in existing hydrogen fuel cells is effectively solved. The scissor-type structure, through its telescopic characteristics, allows the force between adjacent battery frames to be adjusted at equal intervals along the thickness direction, thereby evenly distributing the pressure between the battery frames and battery cells, avoiding local stress concentration caused by uneven pressure distribution, thereby ensuring that the battery cells maintain stable contact pressure and electrochemical reaction efficiency during operation.

[0018] The elastic connection between the regulating plate and the inner end plate in this application can dynamically adjust the pressure distribution of the inner end plate according to the expansion state of the battery cell, ensuring that the pressure of the battery cell is released in time during the expansion process, avoiding performance degradation or structural damage caused by pressure accumulation. At the same time, through the buffering effect of the elastic connection, the local stress concentration phenomenon generated by the battery cell during the expansion process is effectively alleviated, and the structural stability and reliability of the battery stack are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of a high-power hydrogen fuel cell with a stack protection system of the present invention at a first viewing angle.

[0020] Figure 2 It is a stereoscopic diagram of a high-power hydrogen fuel cell with a stack protection system of the present invention under a second viewing angle.

[0021] Figure 3 It is a three-dimensional cross-sectional view of a high-power hydrogen fuel cell with a stack protection system according to the present invention.

[0022] Figure 4 It is a cross-sectional view of a high-power hydrogen fuel cell with a stack protection system according to the present invention.

[0023] Figure 5It is a front view of a high-power hydrogen fuel cell with a stack protection system according to the present invention.

[0024] Figure 6 It is a stereoscopic diagram of a spacing regulator in a high-power hydrogen fuel cell with a stack protection system according to the present invention.

[0025] Figure 7 It is a three-dimensional exploded view of a spacing regulator in a high-power hydrogen fuel cell with a stack protection system according to the present invention.

[0026] Figure 8 It is a stereoscopic diagram of a connecting sleeve and a pre-tightening elastic element in a high-power hydrogen fuel cell with a stack protection system of the present invention.

[0027] Fig. 9 It is a schematic diagram of a battery unit and a battery frame in a high-power hydrogen fuel cell with a battery stack protection system of the present invention.

[0028] Fig.10 It is a stereoscopic diagram of a scissor-type structure and a battery frame in a high-power hydrogen fuel cell with a stack protection system of the present invention.

[0029] The numbers in the figure are: 1. inner end plate; 11. connecting sleeve; 111. limiting ring; 12. preload elastic element; 2. battery frame; 3. spacing adjuster; 31. adjusting plate; 311. driven block; 3111. oblique block; 32. driving plate; 33. driving block; 331. oblique groove; 4. battery unit; 5. scissors-type structure; 51. connecting pin; 52. driving pin; 53. positioning ring; 6. outer end plate; 61. positioning rod; 62. positioning seat; 63. light rod; 64. reset elastic element. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1-Figure 5As shown, a high-power hydrogen fuel cell with a stack protection system includes two inner end plates 1 and a battery frame 2 stacked between the two inner end plates 1 and a spacing adjuster 3 for adjusting the spacing between the two inner end plates 1, a battery unit 4 is arranged in the battery frame 2, a scissors-type structure 5 is arranged between the two inner end plates 1, the scissors-type structure 5 has a connecting pin 51 that can equidistantly telescopically move, the connecting pin 51 is connected to the battery frame 2, when the two inner end plates 1 approach or move away, the abutment force between adjacent battery frames 2 increases as the two inner end plates 1 approach and decreases as the two inner end plates 1 move away; the spacing adjuster 3 has two adjustment plates 31 respectively connected to the two inner end plates 1, and the two adjustment plates 31 can drive the inner end plates 1 connected thereto to move synchronously.

[0032] A high-power hydrogen fuel cell stack protection system, the structure of which includes two parallel inner end plates 1 and a plurality of battery frames 2 stacked therebetween. Battery units 4 are integrated inside the battery frame 2, constituting the core functional unit of the stack. In order to optimize the mechanical stress distribution of the stack, a scissor-type structure 5 is arranged between the two inner end plates 1, which is composed of a plurality of hinged connecting rods and is mechanically coupled with each battery frame 2 through a connecting pin 51. The scissor-type structure 5 has isometric telescopic motion characteristics to ensure that the abutment force between each battery frame 2 is evenly distributed during the compression or release of the stack. The spacing adjuster 3 is connected to the two inner end plates 1 respectively, and is composed of two synchronously movable adjustment plates 31. The spacing of the inner end plates 1 is controlled by the displacement of the adjustment plates 31, thereby realizing the precise adjustment of the overall compression force of the stack. When the inner end plates 1 are close, the scissor-type structure 5 contracts, and the abutment force between the battery frames 2 increases; when the inner end plates 1 are far away, the scissor-type structure 5 extends, and the abutment force decreases accordingly. After adopting the scissor-type structure 5, the standard deviation of the pressure distribution of the fuel cell stack is greatly reduced compared with the existing adjustment method.

[0033] like Figure 5 and Figure 8 As shown, the adjustment plate 31 is elastically connected to its adjacent inner end plate 1. When the two adjustment plates 31 are moved away from each other, the pressure on the two inner end plates 1 toward the adjustment plate 31 decreases. When the two adjustment plates 31 are moved closer to each other, the pressure on the two inner end plates 1 toward the adjustment plate 31 increases.

[0034] The adjustment plate 31 and the adjacent inner end plate 1 are coupled via an elastic connection mechanism, which is made of a highly elastic material or a spring assembly and can provide a buffering effect when the battery cell 4 undergoes thermal or chemical expansion. When the two adjustment plates 31 are separated, the elastic connection mechanism releases its stored elastic potential energy, so that the pressure on the two inner end plates 1 facing the adjustment plate 31 side gradually decreases; when the two adjustment plates 31 are close, the elastic connection mechanism is compressed, and its elastic potential energy increases, resulting in a corresponding increase in the pressure on the two inner end plates 1 facing the adjustment plate 31 side. This design achieves adaptive pressure regulation during the expansion of the battery cell 4 through the dynamic response characteristics of the elastic connection mechanism, avoiding the pressure accumulation and stress concentration problems caused by rigid connection.

[0035] like Figure 6 As shown, it also includes two outer end plates 6, the inner end plate 1 and the battery frame 2 are located between the two outer end plates 6, and a positioning rod 61 is provided between the two outer end plates 6 to transversely connect the two outer end plates 6. The positioning rod 61 passes through the inner end plate 1 and the battery frame 2 and slides with them.

[0036] The hydrogen fuel cell stack protection system also includes two outer end plates 6 arranged in parallel, and the inner end plate 1 and the battery frame 2 are arranged between the two outer end plates 6 to form the main structure of the stack. The two outer end plates 6 are mechanically fixed by a transversely connected positioning rod 61, which passes through the inner end plate 1 and the battery frame 2 and forms a sliding fit relationship with the two. The sliding fit design allows the inner end plate 1 and the battery frame 2 to slide freely along the axial direction of the positioning rod 61 during the thermal expansion or contraction caused by temperature changes, thereby effectively avoiding the compression deformation (collapse) and lateral bending deformation (deflection) caused by temperature gradients. The rigid connection of the positioning rod 61 ensures the structural stability between the outer end plates 6, and the sliding fit mechanism provides the necessary degrees of freedom for the inner end plate 1 and the battery frame 2 to adapt to the dimensional changes caused by temperature changes.

[0037] The sliding fit design of the positioning rod 61 with the inner end plate 1 and the battery frame 2 allows it to slide freely along the axial direction during temperature changes, avoiding compression deformation caused by thermal expansion or contraction, and ensuring the structural integrity of the battery stack.

[0038] like Figure 8 As shown, the inner end plate 1 is provided with a connecting sleeve 11 extending along the thickness direction thereof, the connecting sleeve 11 passes through the adjusting plate 31 and slides with it, a limiting ring 111 is provided at one end of the connecting sleeve 11 close to the adjusting plate 31, and the connecting sleeve 11 is also provided with a pre-tightening elastic element 12 located between the adjusting plate 31 and the inner end plate 1.

[0039] The inner end plate 1 is provided with a connecting sleeve 11 extending in the thickness direction thereof, and the connecting sleeve 11 passes through the adjusting plate 31 and forms a sliding fit relationship with the adjusting plate 31. A limiting ring 111 is provided at one end of the connecting sleeve 11 close to the adjusting plate 31, which is used to limit the maximum distance between the adjusting plate 31 and the inner end plate 1. A pre-tightening elastic element 12 is also provided on the connecting sleeve 11, and the pre-tightening elastic element 12 is located between the adjusting plate 31 and the inner end plate 1, and its elastic force can be dynamically adjusted by changing the distance between the adjusting plate 31 and the inner end plate 1. When the distance between the two adjusting plates 31 changes, the distance between the adjusting plate 31 and the inner end plate 1 changes accordingly, thereby compressing or releasing the pre-tightening elastic element 12, thereby realizing precise adjustment of the elastic force of the pre-tightening elastic element 12. Through this mechanism, the pressure between adjacent battery frames 2 can be dynamically adjusted to ensure the uniformity and stability of the pressure distribution of the battery stack during operation.

[0040] By adjusting the change in the distance between the adjustment plate 31 and the inner end plate 1, the elastic force of the preload elastic element 12 is dynamically adjusted to achieve precise control of the pressure between adjacent battery frames 2, thereby ensuring uniform pressure distribution of the battery stack during operation.

[0041] The elastic force adjustment mechanism of the pre-tightening elastic element 12 effectively avoids the performance degradation or structural damage of the battery unit 4 caused by pressure concentration, thereby improving the reliability and service life of the battery stack.

[0042] The dynamic adjustment capability of the preload elastic element 12 enables it to adapt to the thermal expansion or contraction of the battery cell 4 during temperature changes, thereby reducing the risk of structural deformation caused by thermal stress.

[0043] like Figure 5 As shown, the connecting sleeve 11 is sleeved on the positioning rod 61 and slidably matched therewith.

[0044] The connecting sleeve 11 is sleeved on the positioning rod 61 and forms a sliding fit relationship with the positioning rod 61. The sliding fit design enables the connecting sleeve 11 to slide freely along the axial direction of the positioning rod 61, while ensuring that a stable guiding structure is formed between the connecting sleeve 11 and the positioning rod 61. Through the guiding structure, the connecting sleeve 11 always maintains precise alignment with the positioning rod 61 during the sliding process, avoiding mechanical interference or stress concentration caused by offset or tilt. In addition, the sliding fit mechanism provides the connecting sleeve 11 with the necessary degrees of freedom, so that it can adapt to the dimensional changes of the battery stack under temperature changes or mechanical loads, while ensuring the stability and reliability of the overall structure.

[0045] like Figure 6 and Figure 7As shown, the spacing adjuster 3 also includes a driving plate 32 capable of vertically moving on the battery frame 2 and a driving block 33 linked with the driving plate 32 and located on the outside of the adjusting plate 31. A driven block 311 is provided on the side of the adjusting plate 31 facing the driving block 33. The driven block 311 and the driving block 33 are slidably matched and the sliding contact surface is inclined. When the driving block 33 moves downward, the driven block 311 drives the adjusting plate 31 away from the inner end plate 1.

[0046] The spacing regulator 3 also includes a driving plate 32 that can move in the vertical direction on the battery frame 2, and a driving block 33 that is linked with the driving plate 32 and is located on the outside of the adjusting plate 31. A driven block 311 is provided on the side of the adjusting plate 31 facing the driving block 33, and a sliding fit relationship is formed between the driven block 311 and the driving block 33 through an inclined sliding contact surface. When the driving block 33 moves in the vertical direction driven by the driving plate 32, the inclined sliding contact surface converts the vertical movement of the driving block 33 into the lateral movement of the driven block 311, thereby driving the adjusting plate 31 away from or close to the inner end plate 1. An electric push rod or oil cylinder for driving the driving plate 32 is also provided on the outside of the driving plate 32. When the battery frame 2 needs to be adjusted, the electric push rod or oil cylinder is started to move the driving plate 32 relative to the battery frame 2, thereby realizing dynamic adjustment of the pressure between adjacent battery cells 4 through the linkage mechanism of the driving block 33 and the driven block 311.

[0047] Through the linkage mechanism of the driving plate 32, the driving block 33 and the driven block 311, the vertical movement of the driving block 33 can be converted into the lateral movement of the driven block 311, thereby dynamically adjusting the pressure between adjacent battery cells 4 to ensure the uniformity and stability of the pressure distribution.

[0048] like Figure 6 As shown, a positioning seat 62 is provided at the top end of the outer end plate 6, and a light rod 63 is provided on the positioning seat 62 for sliding cooperation in the vertical direction. The top end of the light rod 63 is fixedly connected to the end of the driving plate 32, and the bottom end of the light rod 63 is fixedly connected to the driving block 33.

[0049] A positioning seat 62 is provided at the top of the outer end plate 6, and a light rod 63 that slides in the vertical direction is installed on the positioning seat 62. The top of the light rod 63 and the end of the driving plate 32 are fixedly connected to form a rigid linkage structure, and the bottom of the light rod 63 and the driving block 33 are fixedly connected to form a rigid linkage structure. Through the transmission action of the light rod 63, the vertical movement of the driving plate 32 can be accurately transmitted to the driving block 33, ensuring the movement synchronization between the driving block 33 and the driving plate 32. The design of the positioning seat 62 provides a stable guiding structure for the light rod 63, ensuring that the light rod 63 always maintains precise vertical alignment during the sliding process, avoiding mechanical interference or stress concentration caused by offset or tilt. This structure realizes efficient transmission and stable guidance between the driving plate 32 and the driving block 33, and provides reliable technical support for the pressure regulation of the battery stack.

[0050] The rigid connection design of the optical rod 63 ensures that the vertical movement of the drive plate 32 can be accurately transmitted to the drive block 33, thereby achieving efficient motion transmission between the drive plate 32 and the drive block 33 and improving the response speed and accuracy of the pressure regulation.

[0051] like Figure 6 As shown, a reset elastic element 64 is sleeved on the polished rod 63, and the elastic reset element is located between the positioning seat 62 and the driving seat.

[0052] The optical rod 63 is sleeved with a reset elastic element 64, which is located between the positioning seat 62 and the driving seat. The reset elastic element 64 provides elastic support during the sliding process of the optical rod 63, and can effectively absorb the vibration and impact generated by the driving plate 32 during the movement, thereby improving the stability of the driving plate 32 in the vertical movement. At the same time, after the driving plate 32 completes the movement, the reset elastic element 64 resets the driving plate 32 to the initial position through its elastic restoring force, ensuring that the driving plate 32 maintains a consistent starting state in multiple movement cycles. This design not only enhances the stability and reliability of the movement of the driving plate 32, but also provides a precise reset function for the pressure regulation of the battery stack, further improving the overall performance of the system.

[0053] The resetting elastic element 64 provides elastic support during the sliding of the light rod 63 , effectively absorbs the vibration and impact generated during the movement of the driving plate 32 , and significantly improves the stability of the driving plate 32 during the vertical movement.

[0054] like Figure 7 As shown, an inclined groove 331 is provided at one end of the driving block 33 facing the adjusting plate 31 , and an inclined block 3111 is provided at one side of the driven block 311 away from the adjusting plate 31 , and the inclined groove 331 and the inclined block 3111 are slidably matched.

[0055] The end of the driving block 33 facing the adjusting plate 31 is provided with an inclined groove 331, and the side of the driven block 311 facing away from the adjusting plate 31 is provided with an inclined block 3111, and a sliding fit relationship is formed between the inclined groove 331 and the inclined block 3111 through an inclined sliding contact surface. When the driving block 33 moves in the vertical direction driven by the driving plate 32, the inclined sliding contact surface between the inclined groove 331 and the inclined block 3111 converts the vertical movement of the driving block 33 into the lateral movement of the driven block 311, thereby driving the adjusting plate 31 to move away from or approach the inner end plate 1 in the horizontal direction. This design realizes the motion conversion between the driving block 33 and the driven block 311 through the cooperation between the inclined groove 331 and the inclined block 3111, ensures the precise displacement of the adjusting plate 31 in the horizontal direction, and thus realizes the dynamic adjustment of the pressure between adjacent battery cells 4.

[0056] The inclined sliding contact surface design of the inclined groove 331 and the inclined block 3111 efficiently converts the vertical movement of the driving block 33 into the lateral movement of the driven block 311, realizes the precise motion conversion between the driving block 33 and the driven block 311, and improves the response speed and accuracy of pressure regulation.

[0057] The matching design of the inclined groove 331 and the inclined block 3111 enhances the mechanical stability between the driving block 33 and the driven block 311, and ensures the overall structural rigidity and reliability of the battery stack during operation.

[0058] like Fig. 9 and Fig.10 As shown, the position of the battery frame 2 at the center is fixed, and both ends of the scissor-type structure 5 have driving pins 52 that are rotatably connected to the inner end plate 1.

[0059] Guide seats are provided on both sides of the battery frame 2, and the positioning rod 61 passes through the guide seats and slides with them. The guide seats on the battery frame 2 located at the center position are fixedly connected to the positioning rod 61, that is, a positioning ring 53 is provided on the positioning rod 61, and the positioning ring 53 is located on both sides of the guide seat to ensure that the position of the battery frame 2 at the center position is fixed when the scissors-type structure 5 is extended or retracted, so that the battery frames 2 on both sides of the battery frame 2 at the center position can move evenly to both sides.

[0060] The battery frame 2 at the center is locked in position by a fixed connection, and the two ends of the scissor-type structure 5 are rotationally connected to the inner end plate 1 through the driving pin 52. Guide seats are symmetrically arranged on both sides of the battery frame 2, and the positioning rod 61 passes through the guide seat and forms a sliding fit with the guide seat. The guide seat on the battery frame 2 at the center is rigidly constrained by a fixed connection with the positioning rod 61, and a positioning ring 53 is arranged on the positioning rod 61. The positioning ring 53 is respectively located on both sides of the guide seat to limit the axial displacement of the guide seat on the positioning rod 61. This design ensures that the battery frame 2 at the center is always fixed during the extension and retraction process of the scissor-type structure 5, and at the same time, the battery frames 2 on both sides of the battery frame 2 at the center can move evenly to both sides along the positioning rod 61, thereby achieving the overall structural stability of the battery stack and the uniformity of pressure distribution.

[0061] Through the design of the fixed connection and the positioning ring 53, the battery frame 2 at the center position always remains fixed during the extension and retraction process of the scissor-type structure 5, thereby avoiding structural instability caused by the deviation of the center position.

[0062] The sliding fit design between the positioning rod 61 and the guide seat ensures that the battery frames 2 on both sides of the battery frame 2 at the center position can move evenly to both sides along the positioning rod 61, thereby achieving symmetry of the battery stack structure and uniformity of pressure distribution.

[0063] The fixed design of the battery frame 2 at the center position enhances the overall structural stability of the battery stack and reduces mechanical interference or stress concentration caused by structural deformation or offset.

[0064] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A high-power hydrogen fuel cell with a stack protection system, characterized in that: It includes two inner end plates and a battery frame stacked between the two inner end plates and a spacing adjuster for adjusting the spacing between the two inner end plates. Battery cells are arranged in the battery frame. A scissors-type structure is arranged between the two inner end plates. The scissors-type structure has connecting pins that can move telescopically at equal intervals. The connecting pins are connected to the battery frame. When the two inner end plates approach or move away from each other, the abutment force between adjacent battery frames increases as the two inner end plates approach each other and decreases as the two inner end plates move away from each other. The spacing adjuster has two adjustment plates respectively connected to the two inner end plates, and the two adjustment plates can drive the inner end plates connected thereto to move synchronously.

2. A high-power hydrogen fuel cell with a stack protection system according to claim 1, characterized in that: The adjustment plate is elastically connected to the inner end plate adjacent thereto. When the two adjustment plates are moved away from each other, the pressure on the two inner end plates toward the adjustment plate side decreases. When the two adjustment plates are moved closer to each other, the pressure on the two inner end plates toward the adjustment plate side increases.

3. A high-power hydrogen fuel cell with a stack protection system according to claim 2, characterized in that: It also includes two outer end plates, the inner end plate and the battery frame are located between the two outer end plates, and a positioning rod is provided between the two outer end plates to laterally connect the two outer end plates. The positioning rod passes through the inner end plate and the battery frame and slides with them.

4. A high-power hydrogen fuel cell with a stack protection system according to claim 3, characterized in that: The inner end plate is provided with a connecting sleeve extending along its thickness direction, the connecting sleeve passes through the adjusting plate and slides with it, a limiting ring is provided at one end of the connecting sleeve close to the adjusting plate, and a pre-tightening elastic element is also provided on the connecting sleeve between the adjusting plate and the inner end plate.

5. A high-power hydrogen fuel cell with a stack protection system according to claim 4, characterized in that: The connecting sleeve is sleeved on the positioning rod and slidably matched with the positioning rod.

6. A high-power hydrogen fuel cell with a stack protection system according to any one of claims 3 to 5, characterized in that: The spacing adjuster also includes a driving plate capable of moving vertically on the battery frame and a driving block linked to the driving plate and located on the outside of the adjusting plate. A driven block is provided on the side of the adjusting plate facing the driving block. The driven block and the driving block are slidably matched and the sliding contact surface is inclined. When the driving block moves downward, the driven block drives the adjusting plate away from the inner end plate.

7. A high-power hydrogen fuel cell with a stack protection system according to claim 6, characterized in that: A positioning seat is arranged at the top of the outer end plate, and a polished rod is arranged on the positioning seat for sliding cooperation along the vertical direction. The top of the polished rod is fixedly connected to the end of the driving plate, and the bottom of the polished rod is fixedly connected to the driving block.

8. A high-power hydrogen fuel cell with a stack protection system according to claim 7, characterized in that: A reset elastic element is sleeved on the polished rod, and the elastic reset element is located between the positioning seat and the driving seat.

9. A high-power hydrogen fuel cell with a stack protection system according to claim 6, characterized in that: An oblique groove is arranged at one end of the driving block facing the adjusting plate, and an oblique block is arranged at one side of the driven block away from the adjusting plate, wherein the oblique groove is in sliding cooperation with the oblique block.

10. A high-power hydrogen fuel cell with a stack protection system according to any one of claims 1 to 5, characterized in that: The position of the battery frame at the center is fixed, and both ends of the scissor-type structure are provided with driving pins rotatably connected to the inner end plates.

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