Tightening device for flow battery stack

Abstract

The utility model belongs to the technical field of fuel cell assembly, and discloses a flow cell stack tightening device. Comprising a bolt tightening assembly and a locking assembly, the bolt tightening assembly can provide torque for a planet wheel transmission assembly through a handle, the planet wheel transmission assembly automatically synchronizes and evenly distributes the torque to a plurality of re-tightening assemblies, it is ensured that the tightening torsion of each bolt is even, accurate torque control is provided, and the reliability of the bolt tightening assembly is improved. Each bolt is ensured to reach the same pre-tightening force, so that the overall fastening quality is improved, the repeated steps and time consumption of operators are reduced, the tightening efficiency is improved, and the automation degree of operation is improved; and meanwhile, the locking assembly is clamped with the nut of the bolt to be retightened through the fastener, so that the nut is prevented from rotating along with the bolt, the position stability of the nut is ensured, the pre-tightening force of the bolt is kept, the fastening quality of each bolt is ensured to be consistent, looseness caused by uneven torsion is effectively avoided, and the safety and reliability of the fastening structure are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell assembly technical field especially relates to a kind of liquid flow battery stack tightening device. BACKGROUND

[0002] Liquid flow battery is a kind of special rechargeable battery, and energy storage and release are realized by the flow of liquid electrolyte, and its main feature is to store electrolyte in independent storage tank, and complete charge-discharge process by pumping electrolyte into the reaction stack inside battery for electrochemical reaction.In liquid flow battery stack, the main role of bolt is to provide necessary clamping force, each bolt passes through the fixed hole of stack outer frame and is connected with the clamping plate or pressing plate in the stack, is fixed by nut or fastener, and each layer component (such as electrode, diaphragm, sealing gasket) in the stack is applied with uniform pressure, to ensure the integrity and sealing performance of stack structure.

[0003] At present, the traditional bolt torque re-tightening operation process is complicated, and usually needs two people to cooperate to carry out multiple rounds of repeated adjustment, not only time-consuming and laborious, but also prone to operation error due to human factors, such as uneven torque distribution, insufficient bolt fastening and other problems, which can directly affect the structural stability and sealing performance of liquid flow battery stack, and further threaten the safe operation of equipment.At the same time, due to the complexity of bolt torque re-tightening operation process, the operator may be tired, which further increases the risk of misoperation, reduces work efficiency and quality consistency. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of liquid flow battery stack tightening device, and automation operation reduces the tedious repeated step, and torque re-tightening efficiency is high, time-saving and labor-saving, can accurately control the size of torque, ensure that the torque of each bolt is evenly distributed, ensure the fastening quality of liquid flow battery stack, reduce the fatigue of operator, improve the consistency of work quality.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Liquid flow battery stack tightening device, bolt is penetrated in the fixed hole of the both sides of battery stack outer frame, nut is screwed with the bolt, for fastening clamping the battery stack, wherein, the liquid flow battery stack tightening device includes:

[0007] A bolt tightening assembly, comprising a handle, a planetary gear assembly and a plurality of re-tightening assemblies, the handle is connected with an input end of the planetary gear assembly and can rotate around the connection between the handle and the planetary gear assembly, the planetary gear assembly comprises a plurality of output ends, one end of each of the plurality of re-tightening assemblies is connected with one of the output ends of the planetary gear assembly one by one, the other end of each of the re-tightening assemblies is clamped with the bolt to be re-tightened, the planetary gear assembly can synchronously distribute the torque input by the handle to the plurality of output ends and drive the plurality of re-tightening assemblies to operate synchronously.

[0008] A locking assembly, comprising a plurality of fasteners and a coupling frame, one end of each of the plurality of fasteners is connected with the coupling frame, the other end of each of the fasteners can be clamped with the nut on the bolt to be re-tightened, so as to prevent the nut from rotating with the bolt.

[0009] Further, the planetary gear assembly comprises a housing, a sun gear, an adapter gear and a plurality of planetary gears, the output end of the handle is fixedly connected with the sun gear, the plurality of planetary gears can be driven by the sun gear through the adapter gear, the adapter gear can arrange the plurality of planetary gears according to the distribution shape of the bolts on both sides of the battery stack, the output end of each of the planetary gears is connected with the re-tightening assembly, and the sun gear, the adapter gear and the plurality of planetary gears are arranged in the housing.

[0010] Further, the planetary gear assembly further comprises a plurality of ring gears, the plurality of ring gears are arranged in the housing and are connected with the plurality of planetary gears one by one, so as to provide support and radial constraint for the planetary gears.

[0011] Further, the re-tightening assembly comprises a first rotating shaft, a connecting rod and a bolt sleeve, one end of the first rotating shaft is connected with the output end of the planetary gear, the other end of the first rotating shaft is connected with one end of the connecting rod, the other end of the connecting rod is connected with the bolt sleeve, the first rotating shaft can drive the connecting rod to rotate around the connection between the first rotating shaft and the connecting rod, so as to adjust the angle of the bolt sleeve, and the bolt sleeve is clamped with the bolt.

[0012] Further, the bolt sleeve and the connecting rod are detachably connected.

[0013] Further, the re-tightening assembly comprises a torque limiting member, the torque limiting member is installed on the first rotating shaft, the input end of the torque limiting member is connected with the output end of the planetary gear assembly, the output end of the torque limiting member is connected with the connecting rod, and the torque limiting member can limit the torque of the bolt sleeve from exceeding a predetermined value.

[0014] Furthermore, the re-tightening assembly also includes a forward and reverse rotation adjustment component, which is disposed between the connecting rod and the bolt sleeve, and the forward and reverse rotation adjustment component can drive the bolt sleeve to rotate in the forward or reverse direction.

[0015] Furthermore, a protective gasket is provided inside the bolt sleeve to protect the surface of the bolt to be tightened.

[0016] Furthermore, all of the fasteners are angularly adjustable and detachably mounted on the connecting frame.

[0017] Furthermore, the planetary gear transmission assembly of the bolt tightening assembly is provided with a first hand handle, and / or;

[0018] The locking assembly has a second hand handle on its connecting frame.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a flow battery stacking tightening device, including a bolt tightening assembly and a locking assembly. Through the coordinated operation of the bolt tightening and locking assemblies, the bolt tightening assembly includes a handle, a planetary gear transmission assembly, and multiple re-tightening assemblies. The handle provides torque to the planetary gear transmission assembly, which automatically and synchronously distributes the torque to the multiple re-tightening assemblies, reducing repetitive steps and time consumption for operators, improving tightening efficiency, and significantly increasing the automation level of the operation. The planetary gear transmission assembly can evenly distribute the input torque to multiple bolts, thereby achieving torque synchronization and uniform distribution, ensuring uniform tightening torque for each bolt, providing precise torque control, and ensuring that each bolt reaches the same preload, thus improving the overall tightening quality. The locking assembly, by fixing multiple fasteners together with the connecting frame, can effectively distribute and transmit forces, enhancing the stability of the overall structure. The multiple fasteners on the connecting frame can engage with the nuts on the multiple bolts one by one, ensuring that the nuts do not rotate during bolt tightening, thus maintaining the bolt preload and ensuring consistent tightening quality for each bolt, effectively preventing loosening caused by uneven torque. Therefore, the automated operation of the flow battery stack tightening device reduces tedious repetitive steps, has high torque re-tightening efficiency, saves time and labor, can accurately control the torque magnitude, ensures uniform torque distribution of each bolt, ensures the tightening quality of the flow battery stack, reduces operator fatigue, and improves the consistency of work quality. Attached Figure Description

[0021] Fig. 1 This is a schematic diagram of the structure of the flow battery stacking and tightening device in this utility model;

[0022] Fig. 2This is a structural schematic diagram of the bolt tightening assembly in this utility model.

[0023] In the picture:

[0024] 1. Bolt tightening assembly; 11. Handle; 12. Planetary gear transmission assembly; 13. Retightening assembly; 131. Connecting rod; 132. Bolt sleeve; 133. Torque limiter; 134. Forward / reverse adjustment component; 14. First hand handle;

[0025] 2. Locking assembly; 21. Fastener; 22. Connecting bracket; 23. Second hand handle. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] Please refer to Figs. 1-2 As shown, this utility model provides a flow battery stack tightening device. Automated operation reduces tedious repetitive steps, offers high torque re-tightening efficiency, saves time and labor, and allows precise control of torque, ensuring uniform torque distribution on each bolt, guaranteeing the tightening quality of the flow battery stack, reducing operator fatigue, and improving work consistency. The flow battery stack tightening device uses bolts that pass through fixing holes on both sides of the battery stack's outer frame. Nuts are screwed onto the bolts to tighten and clamp the battery stack. The device includes a bolt tightening assembly 1 and a locking assembly 2. The bolt tightening assembly 1 includes a handle 11, a planetary gear transmission assembly 12, and multiple re-tightening components 13. The handle 11 is connected to the input end of the planetary gear transmission assembly 12 and can rotate around its connection point. The planetary gear transmission assembly 12 includes multiple output ends, and one end of each of the multiple re-tightening components 13 is... Each planetary gear transmission assembly 12 is connected one-to-one to the output end of each planetary gear transmission assembly 12. The other end of each re-tightening assembly 13 is engaged with the bolts to be re-tightened one by one. The planetary gear transmission assembly 12 can synchronously distribute the torque input from the handle 11 to multiple output ends and drive multiple re-tightening assemblies 13 to operate synchronously. The locking assembly 2 includes multiple fasteners 21 and a connecting frame 22. One end of each fastener 21 is connected to the connecting frame 22. The other end of each fastener 21 can be engaged with the nuts on multiple bolts to be re-tightened one by one to prevent the nuts from rotating with the bolts.

[0031] The bolt tightening assembly 1 and the locking assembly 2 work together. The bolt tightening assembly 1 includes a handle 11, a planetary gear transmission assembly 12, and multiple re-tightening assemblies 13. The handle 11 is connected to the input end of the planetary gear transmission assembly 12 and can rotate around its connection point to the planetary gear transmission assembly 12, providing torque input to the planetary gear transmission assembly 12. The handle 11 allows the operator to apply torque to tighten the bolt from a fixed position. The planetary gear transmission assembly 12 can evenly and synchronously distribute the torque input from the handle 11 to multiple output ends. Each output end is connected one-to-one with a multiple re-tightening assembly 13 to tighten the bolts one by one, ensuring synchronous application of torque. In the locking assembly 2, multiple fasteners 21 are connected to a connecting frame 22. Each fastener 21 can engage with a nut to prevent the nut from rotating with the bolt, ensuring the stability of the bolt and nut. The connecting frame 22 fixes the multiple fasteners 21 on the same device, facilitating the overall fixation of the locking assembly at the position of the bolt to be re-tightened. Therefore, the flow battery stack tightening device can automatically and evenly distribute torque to multiple tightening components 13, ensuring uniform tightening torque for each bolt, providing precise torque control, and ensuring that each bolt reaches the same preload, thereby improving the overall tightening quality, reducing repetitive steps and time consumption for operators, increasing tightening efficiency, and improving the degree of automation of operation; at the same time, the locking component 2 can prevent the nut from rotating with the bolt, ensuring the nut position is stable, maintaining the preload of the bolt, ensuring consistent tightening quality for each bolt, effectively avoiding loosening caused by uneven torque, and improving the safety and reliability of the fastening structure.

[0032] Specifically, the planetary gear transmission assembly 12 includes a housing, a sun gear, an adapter gear, and multiple planetary gears. The output end of the handle 11 is fixedly connected to the sun gear. The multiple planetary gears can mesh with the sun gear through the adapter gear, which allows the multiple planetary gears to be arranged according to the distribution shape of the bolts on both sides of the battery stack. The output end of each planetary gear is connected to the re-tightening assembly 13. The sun gear, adapter gear, and multiple planetary gears are all located inside the housing. The cooperation between the sun gear and the planetary gear transmission assembly 12 can synchronously distribute the input torque of the handle 11 to the output ends of each planetary gear. Through the synergistic effect of the planetary gears and the adapter gear, it is ensured that the torque output of each bolt is uniform, and each re-tightening assembly 13 can obtain equal torque, thereby achieving uniform force transmission when tightening the bolts and avoiding bolt loosening or inconsistent tightening quality caused by uneven torque. The adapter gear can be reasonably arranged according to the distribution shape of the bolts on both sides of the battery stack to ensure that each planetary gear can be accurately aligned with the bolts. It can adapt to structures with multiple bolts distributed in different shapes such as circles or elongations, improving the flexibility and adaptability of the device.

[0033] To enhance the stability of the planetary gears, in some embodiments, the planetary gear transmission assembly 12 further includes multiple internal gear rings disposed within the housing and respectively meshing with multiple planetary gears one-to-one, so as to provide support and radial constraint for the planetary gears; wherein, the one-to-one meshing of the internal gear rings with multiple planetary gears can provide additional radial constraint force and support force, confining the planetary gears on the track and preventing them from displaced or deviating from the track, thereby maintaining the stability and transmission accuracy of the planetary gear transmission assembly 12.

[0034] To improve the flexibility and accuracy of the re-tightening assembly 13, in some embodiments, the re-tightening assembly 13 includes a first rotating shaft, a connecting rod 131, and a bolt sleeve 132. One end of the first rotating shaft is connected to the output end of the planetary gear, and the other end of the first rotating shaft is connected to one end of the connecting rod 131. The other end of the connecting rod 131 is connected to the bolt sleeve 132. The first rotating shaft can drive the connecting rod 131 to rotate around its connection point with the first rotating shaft to adjust the angle of the bolt sleeve 132, which engages with the bolt. The first rotating shaft transmits the output torque of the planetary gear to the connecting rod 131, ensuring the synchronous operation of multiple re-tightening assemblies 13. At the same time, the first rotating shaft allows the connecting rod 131 to rotate around its connection point, thereby adjusting the angle of the bolt sleeve 132. This allows the angle of the bolt sleeve 132 to be precisely adjusted, ensuring that it can adapt to bolts at different angles and positions during re-tightening. The angle adjustment ensures that each bolt receives a consistent re-tightening force, enhancing the adaptability of the device.

[0035] To improve the adaptability of the device, in some embodiments, the bolt sleeve 132 and the connecting rod 131 are detachably connected. The detachable connection between the two allows the bolt sleeve 132 to be replaced at will according to the different types and sizes of the bolts to be retightened, enhancing the versatility of the device. At the same time, the detachable design also allows the bolt sleeve 132 to be quickly replaced or repaired, reducing downtime and improving retightening efficiency.

[0036] like Fig. 2As shown, in order to protect the structure of the device, in some embodiments, the re-tightening assembly 13 includes a torque limiting member 133. The torque limiting member 133 is installed on the first rotating shaft. The input end of the torque limiting member 133 is connected to the output end of the planetary gear transmission assembly 12, and the output end of the torque limiting member 133 is connected to the connecting rod 131. The torque limiting member 133 can limit the torque of the bolt sleeve 132 from exceeding a predetermined value. When torque is applied to the first rotating shaft, the torque limiting member 133 drives the connecting rod 131 to drive. When the torque reaches the preset value, the torque limiter will automatically start and limit the torque transmission, so that the connecting rod 131 and the bolt sleeve 132 start to idle, so as to avoid the continuous increase of torque and thus protect the device from damage. When all the connecting rods 131 and bolt sleeves 132 on the bolt tightening assembly 1 are in the idling state, it can be determined that all the bolts to be re-tightened have reached the predetermined torque value, and the tightening operation is completed. Specifically, the torque limiting component 133 includes an internal gear, a clutch, and an external gear. The internal gear is connected to the first rotating shaft, the input end of the clutch is connected to the internal gear, the output end of the clutch is connected to the external gear, and the external gear is connected to the connecting rod 131. The internal gear rotates with the first rotating shaft, and the clutch transmits the rotational motion of the internal gear to the external gear. The external gear transmits power to the connecting rod 131, which then drives the bolt sleeve 132 to rotate. When the first rotating shaft applies a torque exceeding a predetermined value, the clutch slips, the internal gear continues to rotate, but power cannot be transmitted to the external gear, causing the external gear to lose its driving force. This results in the connecting rod 131 and the bolt sleeve 132 starting to idle. The torque limiting component 133 allows for precise torque control by setting a preset value for the clutch. When the torque exceeds the predetermined value, the clutch slips, and the bolt sleeve 132 enters an idling state, without affecting other components and protecting the flow battery stack structure.

[0037] To enable automatic adjustment of the forward and reverse rotation direction of the bolt sleeve 132, in some embodiments, the re-tightening assembly 13 further includes a forward and reverse rotation adjustment component 134. The forward and reverse rotation adjustment component 134 is located between the connecting rod 131 and the bolt sleeve 132, and can drive the bolt sleeve 132 to rotate forward or in the reverse direction. The forward and reverse rotation adjustment component 134 allows for precise adjustment of the bolt sleeve 132's rotation direction through preset control, ensuring that the bolt's tightening force or looseness reaches an ideal state, avoiding manual adjustment and improving the automation level of the operation. The forward and reverse rotation adjustment component can, but is not limited to, using an electric motor capable of forward and reverse rotation; no specific limitation is made here.

[0038] To protect the surface of the bolt to be tightened, in some embodiments, a protective gasket is provided inside the bolt sleeve 132 to protect the surface of the bolt to be tightened. The protective gasket may be made of a flexible material, which can reduce friction between the bolt sleeve 132 and the bolt surface, reduce bolt surface wear, and prevent scratches on the bolt surface due to excessive torque or repeated tightening operations. It is understood that the protective gasket may be, but is not limited to, a silicone gasket, and no specific limitation is made here.

[0039] like Fig. 1 As shown, to improve the flexibility and adaptability of the locking assembly 2, in some embodiments, multiple fasteners 21 are detachably and angle-adjustable on the connecting frame 22. Since the bolt distribution of different battery stacks may have different shapes or layouts, the angle-adjustable design of the fasteners 21 allows for flexible adjustment of their position and orientation, thus adapting to different types of flow battery stacks and various complex assembly environments. Specifically, the end of each fastener 21 connected to the connecting frame 22 is provided with an external spline, and the end of the connecting frame 22 connected to each fastener 21 is provided with an internal spline. The two are engaged through the internal and external splines to achieve angle adjustment and torque transmission.

[0040] Understandably, the contact surface where the fastener 21 engages with the nut of the bolt to be tightened is provided with a protective gasket to prevent scratching the nut surface.

[0041] To improve operational portability, in some embodiments, the planetary gear transmission assembly 12 of the bolt tightening assembly 1 is provided with a first hand handle 14, and / or the connecting frame 22 of the locking assembly 2 is provided with a second hand handle. The first hand handle 14 is located on the bolt tightening assembly 1, allowing the operator to stably grip the device when adjusting or tightening bolts, thus making it easier to control the direction and operating force of the device, especially convenient when operating in precise positioning or confined spaces. The second hand handle 23 is located on the connecting frame 22 of the locking assembly 2, facilitating the operator's use when fixing or moving the locking assembly 2, making operation smoother and reducing the risk of slippage.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flow battery stack tightening device, wherein bolts pass through fixing holes on both sides of the outer frame of the battery stack, and nuts are screwed onto the bolts for fastening and clamping the battery stack, characterized in that, The flow battery stack tightening device includes: A bolt tightening assembly (1) includes a handle (11), a planetary gear transmission assembly (12), and multiple re-tightening assemblies (13). The handle (11) is connected to the input end of the planetary gear transmission assembly (12) and can rotate around the connection point between it and the planetary gear transmission assembly (12). The planetary gear transmission assembly (12) includes multiple output ends. One end of each of the multiple re-tightening assemblies (13) is connected one-to-one with the output ends of the multiple planetary gear transmission assemblies (12). The other end of each re-tightening assembly (13) is engaged with the bolt to be re-tightened. The planetary gear transmission assembly (12) can synchronously distribute the torque input by the handle (11) to the multiple output ends and drive the multiple re-tightening assemblies (13) to run synchronously. The locking assembly (2) includes a plurality of fasteners (21) and a connecting frame (22). One end of each of the plurality of fasteners (21) is connected to the connecting frame (22), and the other end of each of the fasteners (21) can be engaged one by one with the nuts on the plurality of bolts to be tightened, so as to prevent the nuts from rotating with the bolts.

2. The flow battery stacking tightening device according to claim 1, characterized in that, The planetary gear transmission assembly (12) includes a housing, a sun gear, a transfer gear, and multiple planetary gears; the output end of the handle (11) is fixedly connected to the sun gear, and the multiple planetary gears can mesh with the sun gear through the transfer gear. The transfer gear enables the multiple planetary gears to be arranged according to the distribution shape of the bolts on both sides of the battery stack. The output end of each planetary gear is connected to the re-tightening assembly (13). The sun gear, the transfer gear, and the multiple planetary gears are all located inside the housing.

3. The flow battery stacking tightening device according to claim 2, characterized in that, The planetary gear transmission assembly (12) also includes a plurality of internal gear rings, which are disposed inside the housing and are respectively meshed with a plurality of planetary gears one-to-one to provide support and radial constraint for the planetary gears.

4. The flow battery stacking tightening device according to claim 1, characterized in that, The re-tightening assembly (13) includes a first rotating shaft, a connecting rod (131), and a bolt sleeve (132). One end of the first rotating shaft is connected to the output end of the planetary gear, and the other end of the first rotating shaft is connected to one end of the connecting rod (131). The other end of the connecting rod (131) is connected to the bolt sleeve (132). The first rotating shaft can drive the connecting rod (131) to rotate around its connection with the first rotating shaft to adjust the angle of the bolt sleeve (132). The bolt sleeve (132) engages with the bolt.

5. The flow battery stacking and tightening device according to claim 4, characterized in that, The bolt sleeve (132) is detachably connected to the connecting rod (131).

6. The flow battery stacking tightening device according to claim 5, characterized in that, The re-tightening assembly (13) includes a torque limiting member (133), which is mounted on the first rotating shaft. The input end of the torque limiting member (133) is connected to the output end of the planetary gear transmission assembly (12), and the output end of the torque limiting member (133) is connected to the connecting rod (131). The torque limiting member (133) can limit the torque of the bolt sleeve (132) from exceeding a predetermined value.

7. The flow battery stacking tightening device according to claim 6, characterized in that, The re-tightening assembly (13) further includes a forward and reverse adjustment member (134), which is located between the connecting rod (131) and the bolt sleeve (132). The forward and reverse adjustment member (134) can drive the bolt sleeve (132) to rotate in the forward or reverse direction.

8. The flow battery stacking tightening device according to claim 7, characterized in that, The bolt sleeve (132) is provided with a protective gasket to protect the surface of the bolt to be tightened.

9. The flow battery stacking and tightening device according to any one of claims 1-8, characterized in that, Multiple fasteners (21) are angularly adjustable and detachably mounted on the connecting frame (22).

10. The flow battery stacking tightening device according to any one of claims 1-8, characterized in that, The planetary gear transmission assembly (12) of the bolt tightening assembly (1) is provided with a first hand handle (14), and / or; The locking assembly (2) is provided with a second hand handle (23) on the connecting frame (22).

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