CN112635808B

CN112635808B - Cell stack tightening device

Info

Publication number: CN112635808B
Application number: CN202011468636.0A
Authority: CN
Inventors: 裴后昌; 肖晨光; 宋少云; 王旺平
Original assignee: Wuhan Polytechnic University
Current assignee: Wuhan Polytechnic University
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-04-29
Anticipated expiration: 2040-12-11
Also published as: CN112635808A

Abstract

The invention discloses a cell stack tightening device, which comprises a cell pack, an upper end plate and a lower end plate, wherein the cell pack is arranged between the upper end plate and the lower end plate, the cell stack tightening device comprises a binding belt and a locking mechanism, the binding belt is wound on two sides of the cell stack, the locking mechanism is arranged on the upper end plate, the first end of the binding belt is connected with one end of the locking mechanism, the second end of the binding belt is connected with the other end of the locking mechanism, and the locking mechanism is used for locking the binding belt so that the binding belt tightens the periphery of the cell stack. The cell stack tightening device can tighten the free end of the binding band only by adopting the locking mechanism when tightening the cell stack, can control the compression displacement of the cell stack, does not need to be connected with any energy source, has simple and light structure, and is suitable for more working environments.

Description

Cell stack tightening device

Technical Field

The invention relates to the technical field of battery assembly, in particular to a battery stack tightening device.

Background

A Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that can directly convert chemical energy in gas into electric energy without combustion, and has high energy density, no use of flowing corrosive electrolyte, and simple structure, thus having good development prospects compared with other fuel cells, but a single PEMFC has far failed to meet the requirements of specific equipment, and thus often needs to be assembled into a battery pack. That is, individual PEMFCs are constructed in series or in parallel according to the voltage or current requirements of a particular plant, and the framework materials thereof generally include: 1) end plate: the outermost side of the battery is distributed with an air inlet, an air outlet and the like, and the battery pack is often assembled, and the battery pack is mainly used for fixing the battery pack, namely a total inlet for fuel gas to enter and exit; 2) taking a battery pack: under the end plate, the battery pack is used for collecting current generated by reaction in the battery and guiding the current to the battery pack; 3) bipolar plate: the framework structure of the novel proton exchange membrane fuel cell has high compactness and can ensure the flatness and the verticality among cells.

In previous conventional designs, the stack was joined together with bipolar plates and MEA components by tie rods. Two terminal plates at both ends of the stack provide a fixed plane. The two plates are joined together and pressure is applied to the cell. Springs, such as spiral or butterfly springs, are typically placed between the tie-bar clasp and the end plate to facilitate movement of the end plate to compensate for thermal expansion and contraction of the stack assembly. The draw bar structure has the defects of more parts and large occupied space. Subsequently, placing tie rods at the central manifold may reduce the required external volume, but still occupy the volume at the central manifold, thereby affecting the stack design. In addition, some tie rods and good balancing assemblies are required in combination to ensure uniform cell compression.

The prior art has generally used straps to tie the stack components together for improvements that have resulted in a more compact design and fewer parts. However, manufacturing tolerances cause the straps and the cell stack to be of different lengths. Therefore, the straps need to be cut to length and then welded together, or an adjustment rod and screw may be added to the end of the straps to adjust for differences in the length of the fuel cell assembly. In either case, the stack length defined by the end plates varies with the manufacturing tolerances of the plates, so that it is not possible to maintain a maximum length while ensuring optimum stack compression. The existing fuel cell stack assembly mechanism generally has the defects of low assembly efficiency, large manual operation error, low repeatability, difficulty in effectively controlling stack compression displacement and the like.

Disclosure of Invention

The invention mainly aims to provide a cell stack binding device, aiming at solving the technical problems that the structure of the cell stack binding device is complicated and the compression displacement of a cell stack is controlled in the prior art.

In order to achieve the above object, the present invention provides a cell stack tightening device for tightening a cell stack, the cell stack including a cell pack, an upper end plate and a lower end plate, the cell pack being disposed between the upper end plate and the lower end plate, the cell stack tightening device including a strap and a locking mechanism, the strap being wound around both sides of the cell stack, the locking mechanism being disposed on the upper end plate, a free end of the strap being connected to the locking mechanism, the locking mechanism being configured to lock the strap so that the strap tightens an outer periphery of the cell stack.

Preferably, the bandage is a U-shaped structure, a first boss is arranged at the first end of the bandage, a second boss is arranged at the second end of the bandage, the first boss and the second boss both extend inwards, a first clamping hole is formed in the first boss, a second clamping hole is formed in the second boss, and the first clamping hole and the second clamping hole are both clamped with the locking mechanism.

Preferably, the locking mechanism comprises a bottom plate, and a clamping plate and a driving piece which are arranged on the bottom plate, wherein a first clamping block is arranged at one end of the bottom plate, a second clamping block is arranged on one side of the clamping plate, which faces the bottom plate, the first clamping block is clamped with the first clamping hole, the second clamping block is clamped with the second clamping hole, and the driving piece is used for driving the clamping plate to move along the bottom plate so as to drive the second end of the binding band to face the first end of the binding band to be tightened.

Preferably, the driving member is a gear, the gear is located on one side of the clamping plate, a rack meshed with the gear is arranged on one side of the clamping plate facing the gear, and the extending direction of the rack is the same as the extending direction of the clamping plate.

Preferably, the bottom plate include the joint board and set up in the curb plate of joint board both sides, the joint board includes groove section, segmental arc and connection the groove section with the buffer segment of segmental arc, first fixture block set up in on the groove section, the second fixture block corresponds the buffer segment sets up, the second end of bandage certainly the segmental arc inserts and extends to in the buffer segment.

Preferably, locking mechanism still includes spacing subassembly, spacing subassembly including set up in the spacing platform of bottom plate top, spacing platform include the limiting plate, set up in the mounting panel and the connection of limiting plate both sides the mounting panel with the connecting plate of limiting plate, the mounting panel install in on the curb plate, the mounting panel with form the confession between the bottom plate the bandage male district of dodging, deviate from on the cardboard one side of bottom plate is provided with the spout, the spout certainly the first end orientation of cardboard the second end of cardboard extends, the mounting panel orientation one side of bottom plate set up in spout sliding fit's slider.

Preferably, the limiting assembly further comprises a lock and a lock catch matched with the lock, mounting holes are formed in the connecting plate, two ends of the lock catch penetrate out of the two mounting holes respectively, a trapezoidal groove is formed in one side, deviating from the bottom plate, of the clamping plate, the extending direction of the trapezoidal groove is the same as the extending direction of the clamping plate, and the lock catch is abutted to the second end, close to the clamping plate, of the trapezoidal groove.

Preferably, the hasp include the connecting rod with set up in the handle of the one end of connecting rod, the handle is located the connecting plate deviates from one side of cardboard, the kayser deviates from one side of bottom plate is provided with two hangers, and two hangers are close to respectively the both ends setting of kayser, the connecting rod activity is worn to locate in the hanger.

Preferably, the latch is a metal part, a through hole is formed in the limiting table, a magnetic attraction part is arranged in the through hole, and the magnetic attraction part and the latch are attracted to each other.

Preferably, the bottom plate is provided with a convex column, the convex column penetrates through the gear, the convex column is hinged to the gear, an elastic piece is wound on the convex column, one end of the elastic piece is connected with the convex column, and the other end of the elastic piece is abutted to the gear.

In the cell stack binding device, the upper end plate is covered on the upper end of the cell pack, and the lower end plate is covered under the cell pack, so that the upper end plate and the lower end plate seal the two ends of the cell pack to form a cell stack. Adopt the bandage to fix it in the side around the battery pile, slide around along for the bandage when preventing to use, set up locking mechanism on the upper end plate, then be connected the both ends of bandage with locking mechanism's both ends respectively, when the bandage is tightened with the side around the battery pile, locking mechanism locks the bandage to apply certain pretightning force for the bandage, thereby prevent that not hard up phenomenon from appearing in the battery pile. The cell stack tightening device can control the compression displacement of the cell stack, does not need any energy, has simple and light structure and is suitable for more working environments.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of a stack tightening device tightening a stack according to an embodiment of the present invention;

FIG. 2 is an exploded view of a locking mechanism of a cell stack tightening mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the structure of a binding band in the cell stack binding apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic view of a bottom plate of a cell stack tightening device according to an embodiment of the present invention;

FIG. 5 is a schematic view of a clamping plate of the cell stack fastening device according to one embodiment of the present invention;

fig. 6 is a schematic structural view of a position-limiting table in the cell stack tightening device according to an embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The description of the orientations of "up", "down", "left", "right", "front", "back", etc. in the present invention, with reference to the orientation shown in fig. 1, is merely for explaining the relative positional relationship between the components in the posture shown in fig. 1, and if the specific posture is changed, the directional indication is changed accordingly.

The invention provides a cell stack tightening device.

As shown in fig. 1, in an embodiment of the present invention, the stack fastening device is used for fastening a stack, the stack includes a cell pack 30, an upper end plate 40 and a lower end plate 50, the cell pack 30 is disposed between the upper end plate 40 and the lower end plate 50, the stack fastening device includes a band 10 and a locking mechanism 20, the band 10 is wound on both sides of the stack, the locking mechanism 20 is disposed on the upper end plate 40, a first end of the band 10 is connected to one end of the locking mechanism 20, a second end of the band 10 is connected to the other end of the locking mechanism 20, and the locking mechanism 20 is used for locking the band 10 so that the band 10 fastens the periphery of the stack. In this embodiment, the upper end plate 40 is covered on the upper end of the battery pack 30, and the lower end plate 50 is covered on the lower side of the battery pack 30, so that the upper and

lower end plates

40 and 50 enclose both ends of the battery pack 30 to form a battery stack. The binding bands 10 are fixed at the front and rear sides of the battery stack by using the binding bands 10, in order to prevent the binding bands 10 from sliding back and forth when in use, the locking mechanism 20 is arranged on the upper end plate 40, then the two ends of the binding bands 10 are connected in the locking mechanism 20, when the binding bands 10 tightly bind the front and rear sides of the battery stack, the locking mechanism 20 locks the binding bands 10, so that a certain pre-tightening force is applied to the binding bands 10, and the phenomenon that the battery stack is loosened is prevented. The cell stack tightening device can control the compression displacement of the cell stack, does not need any energy, has simple and light structure and is suitable for more working environments.

As shown in fig. 3, the binding band 10 is of a U-shaped structure, a first boss 11 is disposed at a first end of the binding band 10, a second boss 12 is disposed at a second end of the binding band 10, the first boss 11 and the second boss 12 both extend inward, a first fastening hole 13 is disposed on the first boss 11, a second fastening hole 14 is disposed on the second boss 12, and the first fastening hole 13 and the second fastening hole 14 are both fastened to the locking mechanism 20. In a preferred embodiment, the binding band 10 is of a U-shaped configuration, the first end of the binding band 10 is a free end, and the free end is open, and a receiving cavity 15 for fixing the battery stack is formed in the U-shaped binding band 10. A first boss 11 and a second boss 12 are provided at the free end of the strap 10, and the first boss 11 and the second boss 12 are oppositely provided at an interval, and both the first boss 11 and the second boss 12 extend in the front-rear direction. The first boss 11 is provided with a first clamping hole 13, the second boss 12 is provided with two second clamping holes 14, when the cell stack is tightened, the first clamping hole 13 and the second clamping hole 14 are respectively clamped with two ends of the locking mechanism 20, so that the locking mechanism 20 locks the bandage 10 to prevent the bandage 10 from sliding.

As shown in fig. 2, the locking mechanism 20 includes a bottom plate 21, and a clamping plate 22 and a driving member (not shown) which are disposed on the bottom plate 21, wherein one end of the bottom plate 21 is provided with a first clamping block 23, one side of the clamping plate 22 facing the bottom plate 21 is provided with a second clamping block 24, the first clamping block 23 is clamped with the first clamping hole 13, the second clamping block 24 is clamped with the second clamping hole 14, and the driving member is configured to drive the clamping plate 22 to move along the bottom plate 21, so as to drive the second end of the binding band 10 to be close to the first end of the binding band 10.

In a preferred embodiment, the bottom plate 21 is used for supporting, two second blocks 24 are arranged below the clamping plate 22, and the two second blocks 24 are respectively clamped with the two second clamping holes 14 one by one. The hook-shaped first clamping block 23 is arranged on the bottom plate 21, when the binding band is assembled, the locking mechanism 20 is placed in the groove on the upper end plate 40, the first boss 11 of the binding band 10 is inserted into the bottom plate 21, then the first clamping hole 13 is clamped with the first clamping block 23, and due to the pulling force, the first clamping block 23 hooks the first end of the binding band 10, so that the first end of the binding band 10 cannot fall off from the bottom plate 21. When a pre-load is required to be applied to the stack, the driver drives the catch plate 22 forward, thereby moving the first end of the strap 10 towards the second end of the strap 10 so that the strap 10 does not slip.

As shown in fig. 4, the bottom plate 21 includes a clamping plate 211 and side plates 212 disposed on two sides of the clamping plate 211, the clamping plate 211 includes a groove section 2111, an arc section 2112, and a buffer section 2113 connecting the groove section 2111 and the arc section 2112, the first engaging element 23 is disposed on the groove section 2111, the second engaging element 24 is disposed corresponding to the buffer section 2113, and the second end of the binding band 10 is inserted into the buffer section 2113 from the arc section 2112 and extends into the buffer section 2113. In a preferred embodiment, a first end of strap 10 is inserted into recessed portion 2111, and a second end of strap 10 is inserted from arcuate portion 2112 and may extend into cushioned portion 2113, such that strap 10 slides in the recess of base plate 21, providing a side-to-side stop for strap 10. And, the height of second block 24 is equal to the height of arc-shaped section 2112 on base plate 21, so that binding band 10 can be locked and fixed in arc-shaped section 2112. The arc-shaped section 2112 at the rear end of the base plate 21 is designed to be arc-shaped in order to reduce the friction at the turning point of the binding band 10.

As shown in fig. 6, the locking mechanism 20 further includes a limiting component 27, the limiting component 27 includes a limiting platform 271 disposed above the bottom plate 21, the limiting platform 271 includes a limiting plate 2711, a mounting plate 2712 disposed on two sides of the limiting plate 2711 and a connecting plate 2713 connecting the mounting plate 2712 and the limiting plate 2711, the mounting plate 2712 is mounted on the side plate 212, an avoiding region 2714 for inserting the binding band 10 is formed between the mounting plate 2712 and the bottom plate 21, a sliding groove 221 is disposed on one side of the clamping plate 22 deviating from the bottom plate 21, the sliding groove 221 extends from the first end of the clamping plate 22 toward the second end of the clamping plate 22, and a sliding block 2715 slidably engaged with the sliding groove 221 is disposed on one side of the mounting plate 2712 facing the bottom plate 21. In a preferred embodiment, the mounting plate 2712 and the clamping plate 211 on the limiting platform 271 are arranged at intervals, so that an avoiding area 2714 for inserting the binding band 10 is formed between the mounting plate 2712 and the clamping plate 211, the first end of the binding band 10 is inserted into the avoiding area 2714 and is embedded with the groove section 2111, and the first end of the binding band 10 and the first clamping block 23 are fixedly clamped and connected due to the tensile force, so that the binding band 10 cannot fall off. In addition, a sliding groove 221 extending in the front-rear direction is further formed in the catch plate 22, and is embedded with the sliding block 2715 on the mounting plate 2712, so that the catch plate 22 cannot move left and right, and the rack 26 on the catch plate 22 is protected from being damaged due to friction with other parts.

As shown in fig. 2 and 4, the limiting component 27 further includes a locking device 272 and a locking device 273 engaged with the locking device 272, mounting holes are formed in the two connecting plates 2713, two ends of the locking device 273 penetrate out of the two mounting holes respectively, a trapezoidal groove 222 is formed in one side of the locking plate 22 departing from the bottom plate 21, the extending direction of the trapezoidal groove 222 is the same as that of the locking plate 22, and the locking device 272 abuts against the second end of the trapezoidal groove 222 close to the locking plate 22. In the preferred embodiment, the two ends of the lock 273 are respectively connected to the two connection plates 2713, so that the lock 273 is fixed on the position-limiting platform 271. A plurality of trapezoidal grooves 222 are further formed in the catch plate 22, the plurality of trapezoidal grooves 222 are arranged in the front-rear direction, when the locking mechanism 20 starts to work, the lock 273 drives the lock 272 to move toward the catch plate 22, and when the lock 272 reaches the catch plate 22, the lock 272 cooperates with the second end of the trapezoidal groove 222 in the catch plate 22 to play a role of one-way restriction, so that the catch plate 22 is prevented from moving left and right.

Wherein, hasp 273 includes connecting rod 2731 and sets up in the handle 2732 of the one end of connecting rod 2731, and handle 2732 is located one side that connecting plate 2713 deviates from cardboard 22, and one side that kayser 272 deviates from bottom plate 21 is provided with two hangers 2721, and two hangers 2721 are close to the both ends setting of kayser 272 respectively, and the link 2731 activity is worn to locate in hangers 2721. In a preferred embodiment, two hanging lugs 2721 are disposed at an upper end of the latch 272, and when the lock 273 is connected to the latch 272, the connecting rod 2731 is inserted into one of the hanging lugs 2721 and extends out of the other hanging lug 2721, and the connecting rod 2731 is movably and rotatably connected to the hanging lugs 2721. Still be provided with handle 2732 in connecting rod 2731 one end, handle 2732 convenience of customers rotates connecting rod 2731 to make kayser 272 move towards cardboard 22, block cardboard 22, make cardboard 22 can't remove about.

As shown in fig. 6, the latch 272 is made of metal, a through hole is formed on the position-limiting platform 271, the through hole is disposed in the magnetic element 2716, and the magnetic element 2716 and the latch 272 are attracted to each other. In the preferred embodiment, the magnetic element 2716 is preferably a magnet, and when pre-tightening force is applied, the gear 25 is twisted using a torque wrench, the gear 25 pushes the catch plate 22 forward, so that the strap 10 is tightened, while the metal latch 272 always abuts the catch plate 22 at its end under the attraction of the magnet, interacting with the trapezoidal slot 222 in the catch plate 22, so that the catch plate 22 cannot move backward under the tension of the strap 10, so that the strap 10 is loosened. The protruding block of the clamping table is matched with the sliding groove 221 on the clamping plate 22, so that the clamping plate 22 cannot move left and right, the binding belt 10 is prevented from loosening, and the service life of the clamping plate 22 is shortened due to friction between the rack 26 and other parts.

As shown in fig. 2, the driving member is a gear 25, the gear 25 is located on one side of the catch plate 22, a rack 26 engaged with the gear 25 is arranged on one side of the catch plate 22 facing the gear 25, and the rack 26 extends in the same direction as the catch plate 22. The bottom plate 21 is provided with a convex column 213, the convex column 213 is disposed through the gear 25, an elastic member (not shown) is wound on the convex column 213, one end of the elastic member is connected with the convex column 213, and the other end of the elastic member is abutted against the gear 25. In a preferred embodiment, the resilient member is preferably a spiral spring. A convex column 213 is arranged on the bottom plate 21, a vortex spring is embedded in the convex column 213, the gear 25 is hinged with the convex column 213, a regular hexagonal boss is arranged on the first surface of the gear 25, a wrench is convenient to use to apply torque, a circular surface is cut off below the gear 25, a circle of ratchets are arranged in the circular surface, and the tail end of the vortex spring is in contact with the ratchets. When the binding band 10 is plastically deformed due to the fact that the battery is used for a long time, the gear 25 only needs to be screwed again, the clamping plate 22 moves forwards again, and the pretightening force can be applied again. When disassembly is desired, metal latch 272 releases catch plate 22 by simply pressing down on catch 273, and catch plate 22 will move back under the tension of strap 10 until strap 10 is loosened. In the process, the gear 25 gives a reverse pushing force to the clamping plate 22 due to the action of the internal vortex spring, so that the loosening speed of the clamping plate is reduced, the rigid impact on the single battery in the process is reduced, and the effect of protecting the battery pack 30 is achieved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A cell stack tightening device, the cell stack including a cell pack, an upper end plate and a lower end plate, the cell pack being disposed between the upper end plate and the lower end plate, the cell stack tightening device comprising a strap and a locking mechanism, the strap being wound around both sides of the cell stack, the locking mechanism being disposed on the upper end plate, a first end of the strap being connected to one end of the locking mechanism, a second end of the strap being connected to the other end of the locking mechanism, the locking mechanism being configured to lock the strap so that the strap tightens the outer periphery of the cell stack; the binding band is of a U-shaped structure, a first boss is arranged at the first end of the binding band, a second boss is arranged at the second end of the binding band, the first boss and the second boss both extend inwards, a first clamping hole is formed in the first boss, a second clamping hole is formed in the second boss, and the first clamping hole and the second clamping hole are both clamped with the locking mechanism; the locking mechanism comprises a bottom plate, a clamping plate and a driving piece, the clamping plate and the driving piece are arranged on the bottom plate, a first clamping block is arranged at one end of the bottom plate, a second clamping block is arranged on one side, facing the bottom plate, of the clamping plate, the first clamping block is clamped with the first clamping hole, the second clamping block is clamped with the second clamping hole, and the driving piece is used for driving the clamping plate to move along the bottom plate so as to drive the second end of the binding band to be close to the first end of the binding band.

2. The cell stack tightening device according to claim 1, wherein the driving member is a gear wheel, the gear wheel is located on one side of the card plate, a side of the card plate facing the gear wheel is provided with a rack that engages with the gear wheel, and the rack extends in the same direction as the card plate.

3. The cell stack tightening device according to claim 2, wherein the bottom plate includes a clamping plate and side plates disposed on both sides of the clamping plate, the clamping plate includes a groove section, an arc section, and a buffer section connecting the groove section and the arc section, the first clamping block is disposed on the groove section, the second clamping block is disposed corresponding to the buffer section, and the second end of the binding band is inserted into and extends into the buffer section from the arc section.

4. The battery pack tightening device according to claim 3, wherein the locking mechanism further comprises a limiting assembly, the limiting assembly comprises a limiting table arranged above the bottom plate, the limiting table comprises a limiting plate, a mounting plate and a connecting plate connecting the mounting plate and the limiting plate, the number of the mounting plates is two, the two mounting plates are respectively arranged on two sides of the limiting plate, the mounting plate is arranged on the side plate, an avoiding area for inserting the binding band is formed between the mounting plate and the bottom plate, a sliding groove is arranged on one side of the clamping plate, which is away from the bottom plate, extends from the first end of the clamping plate to the second end of the clamping plate, and a sliding block in sliding fit with the sliding groove is arranged on one side of the mounting plate, which faces the bottom plate.

5. The stack lacing apparatus of claim 4, wherein the limiting assembly further comprises a latch and a lock catch engaged with the latch, wherein the two connecting plates are each provided with a mounting hole, two ends of the lock catch respectively extend out of the two mounting holes, a trapezoidal groove is formed on the side of the clamping plate facing away from the bottom plate, the trapezoidal groove extends in the same direction as the clamping plate, and the latch abuts against the trapezoidal groove near the second end of the clamping plate.

6. The stack binding apparatus according to claim 5, wherein the lock comprises a connecting rod and a handle disposed at one end of the connecting rod, the handle is disposed at a side of the connecting plate facing away from the clamping plate, two hanging lugs are disposed at a side of the lock facing away from the bottom plate, the two hanging lugs are disposed near two ends of the lock, respectively, and the connecting rod is movably disposed in the hanging lugs.

7. The stack binding apparatus of claim 5, wherein the latch is a metal member, the retaining platform has a through hole, and a magnetic member is disposed in the through hole and attracted to the latch.

8. The cell stack tightening device according to any one of claims 2-7, wherein the bottom plate has a protrusion extending through the gear, the protrusion is hinged to the gear, an elastic member is wound around the protrusion, one end of the elastic member is connected to the protrusion, and the other end of the elastic member abuts against the gear.