Pile pull rod device

Abstract

The utility model provides an electric pile pull rod device which comprises a bare pile unit and a pull rod, the bare pile unit comprises a first end plate and a second end plate, and the first end plate and the second end plate are arranged at an interval and define a clamping space for clamping and fixing a reactor core. The pull rod comprises a first end and a second end which are oppositely arranged, the first end is provided with a bent section, the first end is fixedly connected to the side face, away from the clamping space, of the first end plate through the bent section, and the second end plate is connected to different positions in the length direction of the pull rod through a plurality of connecting pieces so as to adjust the distance between the second end plate and the first end plate. The galvanic pile pull rod device can solve the problem that the pile loading force of the galvanic pile is lost due to local stress concentration of the pull rod of the galvanic pile in the prior art.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery stack pull rod device. Background Art

[0002] At present, in order to meet the stacking force, the tie rod type fuel cell stack is fixed with a large number of tie rods installed. However, the applied force of a single tie rod is difficult to control, resulting in insufficient force uniformity of the tie rods after the stack is installed. When the stack is subjected to external force vibration, the local stress concentration at the connection with the tie rod will cause the tie rod connection to fail, further resulting in the loss of the stacking force. In addition, a large number of tie rods can easily cause damage to the stack during disassembly.

[0003] A patent search revealed that Chinese patent document CN220963420U discloses a fuel cell stack assembly, which includes: a cell stack body; a first pressure plate and a second pressure plate that are opposite and spaced apart along a first direction; a pull rod assembly that includes a fixed seat, an elastic member, and a pull rod, wherein the fixed seat is located between the first and second pressure plates, one end of the pull rod is fixed to the second pressure plate, and the other end of the pull rod extends into the fixed seat, and the elastic member is compressed between the fixed seat and the pull rod to drive the pull rod to move toward the first pressure plate along the first direction. Through the cooperation of the first pressure plate, the second pressure plate, and the pull rod assembly, the elastic force of the elastic member in the pull rod assembly can drive the pull rod to move the second pressure plate toward the first pressure plate, which is beneficial for maintaining appropriate compression of the cell stack body, automatically compensating for compression loss of the cell stack body due to aging, and keeping the compression load and stiffness of the cell stack body within a reasonable range, thereby improving the sealing and conductivity of the fuel cell. Although the battery stack is fixed by a tie rod, the length of the tie rod is basically fixed and unchanged. When the number of single cells in the battery stack needs to be changed, the tie rod is no longer applicable. The elastic part can only maintain a certain elasticity to compensate for the compression loss when the battery stack body ages. However, there are relatively few connections between the tie rod and the end plate, and the stress is relatively concentrated, which can easily lead to the loss of the stacking force of the battery stack. For this reason, we propose a battery stack tie rod device. Utility Model Content

[0004] A technical problem to be solved by the present disclosure is that the stacking force of the fuel cell stack is lost due to local stress concentration in the pull rods of the fuel cell stack.

[0005] To solve the above technical problems, the present disclosure provides a stack pull rod device, comprising:

[0006] A bare stack unit, comprising a first end plate and a second end plate, wherein the first end plate and the second end plate are spaced apart and enclose a clamping space for clamping and fixing the core;

[0007] The pull rod includes a first end and a second end arranged opposite to each other, the first end is provided with a bending section, the first end is fixedly connected to the side of the first end plate away from the clamping space through the bending section, and the second end plate is connected to different positions in the length direction of the pull rod through multiple connecting parts to adjust the distance between the second end plate and the first end plate.

[0008] In some embodiments, the bent section is stopped at a side of the first end plate facing away from the second end plate, and is fixedly connected to the first end plate via a fixing member.

[0009] In some embodiments, the first end plate is provided with a fixing groove for fixing the first end of the pull rod, the bending section is provided with at least two fixing members, and the bending section is fixedly connected to the fixing groove through the fixing members.

[0010] In some embodiments, the fixing groove is an L-shaped groove, which includes a first straight section and a second straight section. The first straight section is located on the side of the first end plate and extends along the thickness direction of the first end plate. The second straight section is located on the side of the first end plate away from the first end plate and is connected to the first straight section. The bent section is fixedly connected to the second straight section by a fixing member.

[0011] In some embodiments, the bent section is installed in the fixing groove and the outer surface of the first end plate protrudes from the outer surface of the bent section.

[0012] In some embodiments, the number of connecting members used to connect the second end of the pull rod and the second end plate is greater than the number of fixing members used to connect the first end of the pull rod and the first end plate.

[0013] In some embodiments, the second end of the pull rod is provided with multiple waist-shaped holes arranged side by side, which extend along the length direction of the pull rod. Multiple connecting parts are arranged one-to-one corresponding to the multiple waist-shaped holes and are used to connect the second end plate at different positions in the length direction of the pull rod.

[0014] In some embodiments, a limiting step is provided on the inner wall of the waist-shaped hole, and the connecting part includes a connecting screw, and the end of the connecting screw is provided with a nut that stops at the limiting step, and the top surface of the nut is lower than the outer surface of the pull rod or flush with the outer surface of the pull rod.

[0015] In some embodiments, a plurality of tie rods are symmetrically arranged at two opposite ends of the bare stack unit, and the length direction of each tie rod is arranged along the first direction.

[0016] In some embodiments, the bare stack unit is provided with opposite ends of the tie rod, and the first end plate protrudes from the second end plate.

[0017] Through the above-mentioned technical solution, the stack tie rod device provided by the present disclosure provides multiple waist-shaped holes on the tie rod for connecting the tie rod to the second end plate. These waist-shaped holes reduce the force applied to a single connector, effectively preventing the failure of the stack loading force provided by the connector. By securing the first end of the tie rod to the first end plate, forming a bent section at the first end of the tie rod, and providing a fixing member thereon to secure the tie rod to the first end plate, the tie rod can be effectively prevented from loosening and causing displacement, ensuring the long-term and stable stack loading force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 It is a structural schematic diagram of the stack pull rod device disclosed in an embodiment of the present disclosure.

[0020] Description of reference numerals:

[0021] 1. Bare stack unit; 11. First end plate; 111. Fixing groove; 12. Second end plate; 2. Pull rod; 21. Bend section; 211. Fixing piece; 22. Connecting piece; 23. Waist-shaped hole; 231. Limiting step; 3. Stack core; 4. Current collecting plate; 41. First current collecting plate; 42. Second current collecting plate. DETAILED DESCRIPTION

[0022] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0023] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0024] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0025] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0026] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0027] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0029] See also Figure 1As shown, according to an embodiment of the present application, a fuel cell pull rod device is provided, comprising a bare stack unit 1 and a pull rod 2. The bare stack unit 1 comprises a first end plate 11 and a second end plate 12, which are spaced apart and enclose a clamping space for clamping and fixing the core 3. The pull rod 2 comprises a first end and a second end that are arranged opposite to each other, the first end being provided with a bent section 21, the first end being fixedly connected to the side of the first end plate 11 away from the clamping space via the bent section 21, and the second end plate 12 being connected to different positions along the length direction of the pull rod 2 via a plurality of connectors 22 to adjust the spacing between the second end plate 12 and the first end plate 11.

[0030] In this embodiment, the bare stack unit 1 is formed by a first end plate 11 and a second end plate 12 spaced apart to form a clamping space, which can ensure that the core 3 is firmly clamped between the two end plates, reducing the shaking and displacement of the core 3 during operation, thereby improving the overall stability and safety of the fuel cell stack. The first end of the tie rod 2 is fixedly connected to the first end plate 11 by a bent section 21, which increases the strength of the connection, allowing the tie rod 2 to more effectively transmit and disperse the stress from the core 3, further enhancing the stability of the structure. The second end plate 12 is connected to different positions along the length of the tie rod 2 by a plurality of connectors 22, which can achieve fine-tuning of the spacing between the second end plate 12 and the first end plate 11 according to actual needs, thereby improving the versatility of the device.

[0031] In some embodiments, the bent section 21 stops at a side of the first end plate 11 facing away from the second end plate 12 , and is fixedly connected to the first end plate via a fixing member 211 .

[0032] In this embodiment, the design of the bent section 21 further stabilizes the connection between the tie rod 2 and the first end plate 11, effectively resisting lateral and torsional forces from the core 3 and preventing the tie rod 2 from loosening or falling off during prolonged operation. The bent section 21 creates a smooth transition at the connection between the tie rod 2 and the first end plate 11, reducing stress concentration, extending the service life of the tie rod 2 and the end plate, and improving the reliability of the entire stack assembly.

[0033] In some embodiments, the first end plate 11 is provided with a fixing groove 111 for fixing the first end of the pull rod 2 , and the bending section 21 is provided with at least two fixing members 211 , and the bending section 21 is fixedly connected to the fixing groove 111 via the fixing members 211 .

[0034] In this embodiment, the pull rod 2 is fixed to the first end plate 11 by providing a fixing groove 111 and a fixing member 211, providing a stable fixing point for the pull rod 2, ensuring that the pull rod 2 is not easy to loosen or fall off when subjected to tension or lateral force, thereby improving the stability of the entire stack structure. By fixing the bent section 21 in the fixing groove 111 by at least two fixing members 211, the stress generated by the pull rod 2 when subjected to force can be more effectively dispersed, which helps to reduce stress concentration and extend the service life of the pull rod 2 and the first end plate 11. The provision of the fixing groove 111 allows the pull rod 2 to be quickly positioned to the correct position during the assembly process, improving assembly efficiency and reducing problems caused by assembly errors. The bent section 21 is precisely fixed in the fixing groove 111 by the fixing member 211, ensuring the connection accuracy between the pull rod 2 and the first end plate 11, and ensuring the accuracy of the relative positions between the components inside the stack, thereby improving the overall performance of the stack.

[0035] In some embodiments, the fixing groove 111 is an L-shaped groove, which includes a first straight section and a second straight section. The first straight section is located on the side of the first end plate 11 and extends along the thickness direction of the first end plate 11. The second straight section is located on the side of the first end plate 11 away from the first end plate 11 and is connected to the first straight section. The bent section 21 is fixedly connected to the second straight section by a fixing member 211.

[0036] In this embodiment, by setting the fixing groove 111 as an L-shaped groove, a more stable fixing point is provided for the bent section 21 of the pull rod 2. The bent section 21 is tightly fixed in the second straight section by the fixing member 211, and can resist forces and torques from all directions, thereby significantly improving the stability of the battery stack structure. The L-shaped groove structure helps to disperse the stress generated by the pull rod 2 when it is subjected to force, reduces the occurrence of stress concentration, helps to extend the service life of the pull rod 2 and the end plate, and improves the reliability of the entire battery stack device. The first straight section extends along the thickness direction of the first end plate 11, which can achieve the initial positioning of the pull rod 2. During the assembly process, the bent section 21 can be easily aligned and inserted into the first straight section, and then further fixing operations can be performed. Once the initial positioning of the bent section 21 is completed, the fixing member 211 can be quickly fixed in the second straight section, thereby improving assembly efficiency.

[0037] In some embodiments, the bent section 21 is installed in the fixing groove 111 and the outer surface of the first end plate 11 protrudes from the outer surface of the bent section 21 .

[0038] In this embodiment, by fully embedding the bent section 21 in the fixing groove 111 and allowing the outer surface of the first end plate 11 to protrude beyond the bent section 21, a tight connection is achieved between the tie rod 2 and the end plate, helping to improve the space utilization of the entire fuel cell stack. The protruding outer surface of the first end plate 11 provides a certain degree of protection for the bent section 21, preventing it from being directly impacted or damaged by the external environment, helping to extend the service life of the tie rod 2 and reducing the repair costs caused by accidental damage.

[0039] In some embodiments, the number of connecting members 22 for connecting the second end of the pull rod 2 and the second end plate 12 is greater than the number of fixing members 211 for connecting the first end of the pull rod 2 and the first end plate 11 .

[0040] In this embodiment, increasing the number of connectors 22 can more effectively disperse the stress generated by the pull rod 2 when it is subjected to force. As the number of connection points between the second end and the second end plate increases, the stress borne by each connection point is reduced accordingly, thereby reducing the risk of stress concentration. More connectors provide more fixing points and support points, which help to enhance the connection strength between the pull rod 2 and the second end plate 12. Even under extreme working conditions, the stability of the connection can be maintained to prevent the pull rod from falling off or loosening. By increasing the number of connectors 22, the pull rod 2 can be more evenly distributed at each connection point when subjected to force, which helps to avoid deformation or damage caused by excessive local force.

[0041] In some embodiments, the second end of the pull rod 2 is provided with a plurality of waist-shaped holes 23 arranged side by side, and the waist-shaped holes 23 extend along the length direction of the pull rod 2. A plurality of connecting members 22 are arranged one-to-one corresponding to the plurality of waist-shaped holes 23 and are used to connect the second end plate 12 at different positions in the length direction of the pull rod 2.

[0042] In this embodiment, by setting side-by-side waist-shaped holes 23, the connector 22 is allowed to have a certain adjustment range in the length direction of the pull rod 2. The second end plate 12 can be connected to different positions on the pull rod 2 by adjusting the position of the connector 22 in the waist-shaped hole according to actual needs. The flexibility of the connection is increased, so that the stack pull rod device can better adapt to different installation conditions and space limitations. By adjusting the position of the connector 22 in the waist-shaped hole, the connection layout between the pull rod 2 and the end plate can be optimized to better meet the performance requirements under different working conditions. Multiple connectors 22 are connected to the pull rod 2 through the waist-shaped hole 23, which can more effectively disperse the stress generated by the pull rod 2 when it is under force, help reduce the risk of stress concentration, and improve the connection strength between the pull rod 2 and the end plate. The matching design of the waist-shaped hole 23 and the connector 22 makes the connection more stable and reliable. Even under extreme working conditions, the stability of the connection can be maintained to prevent the pull rod from falling off or loosening.

[0043] In some embodiments, a limiting step 231 is provided on the inner wall of the waist-shaped hole 23, and the connecting member 22 includes a connecting screw, and the end of the connecting screw is provided with a nut that stops at the limiting step, and the top surface of the nut is lower than the outer surface of the pull rod 2 or flush with the outer surface of the pull rod 2.

[0044] In this embodiment, the cooperation between the limiting step 231 and the nut effectively limits the axial movement of the connecting screw within the waist-shaped hole 23, preventing the screw from loosening due to vibration or external forces, thereby enhancing the stability of the connection between the tie rod 2 and the end plate. The top surface of the nut is lower than or flush with the outer surface of the tie rod, preventing accidental injury or equipment damage caused by the protruding nut, thereby improving the safety of the entire fuel cell stack.

[0045] In some embodiments, a plurality of tie rods 2 are symmetrically arranged at opposite ends of the bare stack unit 1, and the length direction of each tie rod 2 is along the first direction (eg Figure 1 The direction indicated by the X axis) is set.

[0046] In this embodiment, the symmetrical arrangement of the tie rods 2 at both ends of the bare stack unit 1 enables the structure to maintain a relatively good state of balance when subjected to stress. The symmetrical distribution helps reduce stress concentration caused by uneven stress, thereby improving the overall stability of the structure. The tie rods 2 are arranged along a first direction, providing an effective constraint on the bare stack unit 1, which can limit the deformation of the bare stack unit 1 in a specific direction, maintain the stability of its shape and position, and prevent performance degradation or damage due to excessive deformation. The arrangement of multiple tie rods 2 increases the stiffness of the bare stack unit 1 in the direction of force, helps reduce the deformation of the structure under the action of external loads, thereby maintaining the stability and bearing capacity of the structure.

[0047] In some embodiments, the bare stack unit 1 is provided with the tie rods 2 at opposite ends, and the first end plates 11 both protrude beyond the second end plates 12 .

[0048] In this embodiment, the protruding design of the first end plate 11 creates a more compact structure at both ends of the bare stack unit 1, helping to reduce the overall size of the bare stack unit 1 and thus optimize its spatial layout within the device or system. The protruding portion of the first end plate 11 serves as an additional support structure, enhancing the stability of the bare stack unit 1 under load and helping to reduce the risk of damage caused by vibration or external impact. When subjected to external forces, the protruding first end plate 11 can disperse stress, avoiding localized damage caused by stress concentration, and helping to improve the durability and service life of the bare stack unit 1.

[0049] In some embodiments, a current collecting plate 4 for collecting the current generated by the core is provided on one side of the first end plate 11 and the second end plate 12 close to the clamping space. The current collecting plate 4 includes a first current collecting plate 41 and a second current collecting plate 42. The first current collecting plate 41 is fixed to the side of the first end plate 11 close to the clamping space for installing the first current collecting plate 41 in a slot, and the second current collecting plate 42 is fixed to the side of the second end plate 12 close to the clamping space for installing the second current collecting plate 42 in a slot.

[0050] In this embodiment, a first current collecting plate 41 and a second current collecting plate 42 are respectively provided on one side of the first end plate 11 and the second end plate 12 close to the clamping space, which can significantly improve the efficiency of current collection and distribution inside the battery stack. As a key component for current conduction, the effective arrangement of the current collecting plate 4 can ensure that the current flows evenly and quickly from each single cell to the end plate, and then is led out from the end plate to the external circuit. The first current collecting plate 41 and the second current collecting plate 42 are respectively fixed to the corresponding sides of the first end plate 11 and the second end plate 12, which not only enhances the stability of the structure, but also optimizes the current path and reduces energy loss. It helps to reduce the resistance difference between single cells and improve the overall output voltage and power density of the battery stack.

[0051] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0052] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A stack pull rod device, characterized in that: include: A bare stack unit (1), comprising a first end plate (11) and a second end plate (12), wherein the first end plate (11) and the second end plate (12) are spaced apart and enclose a clamping space for clamping and fixing a core (3); A pull rod (2), the pull rod (2) comprising a first end and a second end arranged opposite to each other, the first end being provided with a bending section (21), the first end being fixedly connected to the side of the first end plate (11) away from the clamping space via the bending section (21), the second end plate (12) being connected to different positions along the length direction of the pull rod (2) via a plurality of connecting members (22) to adjust the distance between the second end plate (12) and the first end plate (11).

2. The stack pull rod device according to claim 1, characterized in that: The bent section (21) is stopped at a side of the first end plate (11) facing away from the second end plate (12), and is fixedly connected to the first end plate via a fixing member (211).

3. The stack pull rod device according to claim 2, characterized in that: The first end plate (11) is provided with a fixing groove (111) for fixing the first end of the pull rod (2), and the bending section (21) is provided with at least two fixing members (211), and the bending section (21) is fixedly connected to the fixing groove (111) through the fixing members (211).

4. The stack pull rod device according to claim 3, characterized in that: The fixing groove (111) is an L-shaped groove, and the L-shaped groove includes a first straight section and a second straight section, the first straight section is located on the side of the first end plate (11) and extends along the thickness direction of the first end plate (11), the second straight section is located on the side of the first end plate (11) away from the first end plate (11) and is connected to the first straight section, and the bent section (21) is fixedly connected to the second straight section through the fixing member (211).

5. The stack pull rod device according to claim 3, characterized in that: The bent section (21) is installed in the fixing groove (111) and the outer surface of the first end plate (11) protrudes from the outer surface of the bent section (21).

6. The stack pull rod device according to claim 2, characterized in that: The number of connecting members (22) for connecting the second end of the pull rod (2) and the second end plate (12) is greater than the number of fixing members (211) for connecting the first end of the pull rod (2) and the first end plate (11).

7. The stack pull rod device according to claim 1, characterized in that: The second end of the pull rod (2) is provided with a plurality of waist-shaped holes (23) arranged side by side, and the waist-shaped holes (23) extend along the length direction of the pull rod (2). The plurality of connecting members (22) and the plurality of waist-shaped holes (23) are arranged in a one-to-one correspondence and are used to connect the second end plate (12) to different positions in the length direction of the pull rod (2).

8. The stack pull rod device according to claim 7, characterized in that: A limiting step (231) is provided on the inner wall of the waist-shaped hole (23), and the connecting member (22) includes a connecting screw, the end of which is provided with a nut that stops at the limiting step, and the top surface of the nut is lower than the outer surface of the pull rod (2) or is flush with the outer surface of the pull rod (2).

9. The stack pull rod device according to any one of claims 1 to 8, characterized in that: A plurality of tie rods (2) are symmetrically arranged at opposite ends of the bare stack unit (1), and the length direction of each tie rod (2) is arranged along the first direction.

10. The stack pull rod device according to any one of claims 1 to 8, characterized in that: The bare stack unit (1) is provided with the pull rod (2) at two opposite ends, and the first end plate (11) protrudes from the second end plate (12).

Images