Flow battery stack press-fitting equipment

Abstract

The invention provides flow battery stack press-fitting equipment which comprises a base, a top plate and a plurality of guide columns, and the base is fixedly connected with the top plate through the plurality of guide columns; a first pressure mechanism and a second pressure mechanism are mounted on the top plate, a third pressure mechanism is arranged on the base, and the first pressure mechanism is used for being matched with the base to press an electric pile; the second pressure mechanism is used for downwards compressing a spring on the outer side of the upper end plate of the electric pile, and the third pressure mechanism is used for upwards compressing a spring on the outer side of the lower end plate of the electric pile. The first pressure mechanism is matched with the base to press the electric pile, and the second pressure mechanism and the third pressure mechanism respectively compress springs from the outer side of the upper end plate and the outer side of the lower end plate of the electric pile, so that the springs at the two ends of the electric pile are symmetrically pressed; and the problems of dislocation, deformation, damage and the like between stack material layers caused by asymmetric press fitting are avoided, and the stack press fitting quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery stack pressing, and in particular to a liquid flow battery battery stack pressing device. Background Art

[0002] A liquid flow battery stack is usually composed of an outer end plate, a current collector, a battery cell, a spring, fasteners, etc. Among them, a battery cell is generally composed of a bipolar plate, a liquid flow frame, a diaphragm, a sealing gasket (sealing ring), and electrodes stacked in a certain order. The battery cells are also assembled into a whole by stacking. The two outermost working surfaces of the stack composed of battery cells and current collectors are in contact with the outer end plate, and the stack is controlled to the thickness required by the process by bolts and nuts that pass through all the above materials. Usually, in order to compensate for the thickness deformation of the stack under different ambient temperatures and avoid leakage caused by gaps between the layers of the stack, a strong spring is added between the nut and the outer end plate to provide pre-tightening force when designing the battery stack.

[0003] Without the help of external equipment, it is very difficult to manually tighten the fasteners that penetrate the stack to the height required by the process. The reasons are as follows:

[0004] 1) There are many fasteners, and manual tightening is time-consuming and laborious;

[0005] 2) The tightening sequence of fasteners must be symmetrical. If asymmetrical operations are used during the tightening process, the battery stack may be skewed, the force between the stack layers may be uneven, and key materials may be damaged.

[0006] 3) From the perspective of material cost, the length of the screw in the fastener is usually between the natural thickness of the stack in the relaxed state and the formed thickness. This makes it possible that in the relaxed state, the length of the screw is not enough to penetrate the entire stack, and both ends leak out and cannot be tightened manually;

[0007] The current battery stack pressing equipment basically only presses the middle area of ​​the end plate of the battery stack, avoiding the spring area, and does not have the function of spring compression, which makes it difficult to control the process of compressing the spring to the target height; in addition, without compressing the spring, the springs can only be compressed one by one when the fasteners are tightened in sequence, and it is impossible to compress all the springs to the same extent at the same time, so the pressure load on the battery stack during the tightening process is uneven. Even if there are current pressing equipment that can compress springs, it is impossible to press symmetrically in steps and areas, and generally only compresses the springs on one side. When the battery stack is pressed for the first time, pressure is applied to the central area of ​​one side of the battery stack, and the spring area on the other side is compressed. The pressure load is applied asymmetrically to form the battery stack. This method has the risk of dislocation, deformation and damage between the layers of the battery stack material. Summary of the invention

[0008] The present invention proposes a liquid flow battery stack pressing device, which solves the problems that the stack pressing device in the prior art cannot symmetrically press the springs at both ends of the stack in steps and regions, and the asymmetrical application of pressure loads may cause misalignment, deformation and damage between layers of the stack material.

[0009] The technical solution of the present invention is achieved in this way:

[0010] The present invention provides a liquid flow battery stack pressing device, comprising a base, a top plate and a plurality of guide columns, wherein the base and the top plate are fixedly connected via the plurality of guide columns; a first pressure mechanism and a second pressure mechanism are installed on the top plate, and a third pressure mechanism is provided on the base, wherein the first pressure mechanism is used to cooperate with the base to press the stack; the second pressure mechanism is used to compress the spring on the outer side of the upper end plate of the stack downward, and the third pressure mechanism is used to compress the spring on the outer side of the lower end plate of the stack upward.

[0011] The present invention uses a first pressure mechanism to cooperate with a base to press the fuel cell stack, and then uses a second pressure mechanism and a third pressure mechanism to compress the spring from the outer side of the upper end plate and the outer side of the lower end plate of the fuel cell stack respectively, so as to achieve symmetrical pressure on the springs at both ends of the electric push, avoid problems such as misalignment, deformation and damage between layers of fuel cell materials caused by asymmetric press assembly, and improve the press assembly quality of the fuel cell stack.

[0012] Specifically, the first pressure mechanism includes a first telescopic driving component, and a pressure block is installed on the bottom end of the first telescopic driving component; a plurality of first linear bearings are installed on the top plate, and a first guide rod is slidably installed in the first linear bearing, and the bottom end of the first guide rod is connected to the pressure block, and the first telescopic driving component is used to drive the pressure block to move downward to cooperate with the base to press the battery stack.

[0013] Specifically, the second pressure mechanism includes a second telescopic driving component, a pressure plate is installed at the bottom end of the second telescopic driving component, and a first avoidance opening is provided in the middle of the pressure plate for the first pressure mechanism to pass through; the pressure plate is slidably connected to a plurality of guide columns, and the bottom surface of the pressure plate is provided with an upper fixture that cooperates with the outer spring of the upper end plate of the battery stack, and the second telescopic driving component is used to drive the pressure plate and the upper fixture to move downward to compress the spring on the outer side of the upper end plate.

[0014] Furthermore, a second avoidance opening for the first pressure mechanism to pass through is provided in the middle of the upper fixture, and a first convex edge extending outward is provided on the bottom surface of the upper fixture, and a plurality of first step holes are opened on the bottom surface of the first convex edge, and the inner diameter of the bottom surface of the first step hole is larger than the inner diameter of the top surface, and the inner diameter of the bottom surface of the first step hole matches the outer diameter of the spring and the washer on the outer side of the upper end plate, and the inner diameter of the top surface of the first step hole matches the outer diameter of the tightening tool of the nut on the outer side of the upper end plate.

[0015] The present invention can realize independent action of the first pressure mechanism and the second pressure mechanism by respectively opening the first avoidance opening and the second avoidance opening in the middle of the pressure plate and the upper fixture, thereby facilitating the compression of the battery stack and the spring respectively; the spring and the washer are limited by a plurality of first step holes on the first convex edge of the bottom surface of the upper fixture, so that the nut can be tightened to the washer position by using a tightening tool after the spring is compressed.

[0016] Specifically, the third pressure mechanism includes a third telescopic driving component, and the base is provided with a lower fixture that cooperates with the spring on the outer side of the lower end plate. The third telescopic driving component is used to drive the lower fixture to move upward to compress the spring on the outer side of the lower end plate.

[0017] Furthermore, a bottom plate is provided on the base, and a carrier for carrying the battery stack is provided in the middle of the top surface of the bottom plate; a third avoidance opening for the carrier to pass through is provided in the middle of the lower fixture, the lower fixture is sleeved on the outside of the carrier, and a second convex edge extending outward is provided on the top surface of the lower fixture, and a plurality of second step holes are provided on the top surface of the second convex edge, the inner diameter of the top surface of the second step hole is larger than the inner diameter of the bottom surface, the inner diameter of the top surface of the second step hole matches the outer diameter of the spring and washer on the outer side of the lower end plate, and the inner diameter of the bottom surface of the second step hole matches the outer diameter of the tightening tool of the nut on the outer side of the lower end plate; a plurality of avoidance holes are provided on the bottom plate, and the position of the avoidance holes corresponds to the position of the third telescopic driving component, and the corresponding telescopic rod is driven by the third telescopic driving component to pass through the avoidance hole on the bottom plate to lift the lower fixture, so that the lower fixture moves upward to compress the spring on the outer side of the lower end plate. By opening a third avoidance opening in the middle part of the lower fixture, the independent action of the third pressure mechanism can be achieved, which facilitates the compression of the spring on the outer side of the lower end plate of the fuel cell stack; the spring and the washer are limited by a plurality of second step holes on the second convex edge of the top surface of the lower fixture, so that after the spring is compressed, the nut can be tightened to the washer position using a tightening tool.

[0018] Furthermore, a plurality of positioning rings are provided on the bottom surface of the second convex edge of the lower jig, and the outer diameter and position of the positioning rings correspond to the inner diameter and position of the avoidance hole, and the inner diameter of the positioning rings matches the outer diameter of the end of the telescopic rod of the third telescopic driving component. By arranging a plurality of positioning rings on the bottom surface of the second convex edge of the lower jig, it is convenient to guide and position the end of the telescopic rod of the third telescopic driving component, and to facilitate the positioning of the lower jig with the bottom plate when it falls back.

[0019] Furthermore, the thickness of the carrier is greater than the thickness of the lower fixture, and the difference between the thickness of the carrier and the thickness of the lower fixture is d, the depth of the upper half of the second step hole with a larger inner diameter is h, and the sum of the length of the spring on the outer side of the lower end plate in a natural state and the thickness of the gasket is L, then the sum of d and h matches L; the purpose of this design is that when the battery stack is placed on the lower fixture, the bottom surface of the lower end plate of the battery stack abuts against the top surface of the carrier, and the spring and gasket under the lower end plate are in an unpressurized state, thereby ensuring that the compression states of the springs at both ends of the battery stack are consistent.

[0020] Preferably, a cushion seat is provided on the base, and the cushion seat is located below the bottom plate; a plurality of positioning protrusions are provided on the top surface of the cushion seat, and a plurality of positioning holes matching the positioning protrusions are provided on the bottom surface of the bottom plate; a bracket is provided on the base, and two parallel conveying lines are provided on the bracket, and the top surface of the conveying line is located below the bottom surface of the bottom plate, and the distance between the two conveying lines is less than the width of the bottom plate; a lifting mechanism is provided below the bracket, and the lifting mechanism is used to drive the bracket and the conveying line to rise and fall. By arranging a cushion seat, a bracket, a conveying line and a lifting mechanism on the base, the loading and unloading transportation of the battery stack is facilitated, and the docking efficiency of the processes before and after the battery stack is pressed is improved.

[0021] Specifically, the lifting mechanism is provided with two groups, and the two groups of lifting mechanisms are respectively located at both ends of the bracket; the lifting mechanism includes a fourth telescopic driving component, and the fourth telescopic driving component is fixedly mounted on the mounting plate, and the end of the telescopic rod of the fourth telescopic driving component is fixedly connected to the bracket; a second linear bearing is fixedly mounted on the bracket, and a second guide rod is slidably mounted in the second linear bearing, and the bottom end of the second guide rod is fixedly connected to the mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A three-dimensional diagram of a flow battery stack press-assembly device according to the present invention;

[0024] Figure 2 It is a side view of a flow battery stack press-assembly device of the present invention;

[0025] Figure 3 It is a schematic diagram of assembling the upper fixture, spring, washer and nut in an embodiment of the present invention;

[0026] Figure 4It is a schematic diagram of the assembly of the lower fixture, the base plate, the carrier, the spring, the washer, and the nut in the embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the assembly of the lower fixture, the bottom plate, the carrier, and the cushion seat in an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the assembly of the third telescopic driving component, the cushion seat, the bottom plate, the carrier, and the lower fixture in an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of assembling the battery stack, the upper fixture, the pressing block, the lower fixture, and the carrier in an embodiment of the present invention;

[0030] Figure 8 It is a schematic diagram of the assembly of the conveyor line body, the bracket and the lifting mechanism in the embodiment of the present invention;

[0031] Fig. 9 It is a schematic diagram of the state when the battery stack is located at the loading position of the press-fitting equipment in an embodiment of the present invention;

[0032] Fig.10 It is a schematic diagram of the state when the battery stack is located at the pressing position of the pressing equipment in an embodiment of the present invention;

[0033] Fig.11 It is a partially enlarged schematic diagram of a battery stack in an embodiment of the present invention when it is located at a pressing position of a pressing device;

[0034] In the figure: 1, base; 2, top plate; 3, guide column; 4, battery stack; 5, upper end plate; 6, lower end plate; 7, first telescopic drive component; 8, pressure block; 9, first linear bearing; 10, first guide rod; 11, second telescopic drive component; 12, pressure plate; 13, first avoidance; 14, upper fixture; 15, second avoidance; 16, first convex edge; 17, first step hole; 18, spring; 19, washer; 20, nut; 2 1. The third telescopic driving component; 22. The lower fixture; 23. The bottom plate; 24. The platform; 25. The third avoidance; 26. The second convex edge; 27. The second step hole; 28. The avoidance hole; 29. ​​The positioning ring; 30. The cushion seat; 31. The positioning protrusion; 32. The positioning hole; 33. The bracket; 34. The conveyor line body; 35. The fourth telescopic driving component; 36. The mounting plate; 37. The second linear bearing; 38. The second guide rod; 39. The screw. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 11 The present invention provides a liquid flow battery stack pressing device, including a base 1, a top plate 2 and a plurality of guide columns 3, wherein the base 1 is fixedly connected to the top plate 2 via the plurality of guide columns 3; a first pressure mechanism and a second pressure mechanism are installed on the top plate 2, and a third pressure mechanism is provided on the base 1, wherein the first pressure mechanism is used to cooperate with the base 1 to press the stack 4; the second pressure mechanism is used to compress downward the spring 18 on the outer side of the upper end plate 5 of the stack 4, and the third pressure mechanism is used to compress upward the spring 18 on the outer side of the lower end plate 6 of the stack 4.

[0037] The present invention uses a first pressure mechanism in cooperation with the base 1 to press the fuel cell stack 4, and then uses a second pressure mechanism and a third pressure mechanism to compress the spring 18 from the outside of the upper end plate 5 and the outside of the lower end plate 6 of the fuel cell stack 4, respectively, to achieve symmetrical pressure on the springs 18 at both ends of the electric push, avoiding problems such as misalignment, deformation and damage of material layers of the fuel cell stack 4 caused by asymmetric pressing, and improving the pressing quality of the fuel cell stack 4.

[0038] Specifically, Figure 1 , 2 As shown, the first pressure mechanism includes a first telescopic driving component 7, and a pressure block 8 is installed at the bottom end of the first telescopic driving component 7; a plurality of first linear bearings 9 are installed on the top plate 2, and a first guide rod 10 is slidably installed in the first linear bearing 9, and the bottom end of the first guide rod 10 is connected to the pressure block 8, and the first telescopic driving component 7 is used to drive the pressure block 8 to move downward to cooperate with the base 1 to press the battery stack 4.

[0039] Specifically, Figure 1 , 2 As shown, the second pressure mechanism includes a second telescopic driving component 11, a pressure plate 12 is installed at the bottom end of the second telescopic driving component 11, and a first avoidance opening 13 for the pressure block 8 to pass through is provided in the middle of the pressure plate 12; the pressure plate 12 is slidably connected to a plurality of guide columns 3, and an upper fixture 14 is provided on the bottom surface of the pressure plate 12 for cooperating with the outer spring 18 of the upper end plate 5 of the battery stack 4, and the second telescopic driving component 11 is used to drive the pressure plate 12 and the upper fixture 14 to move downward to compress the spring 18 on the outer side of the upper end plate 5.

[0040] Furthermore, if Figure 3As shown, the middle part of the upper fixture 14 is provided with a second avoidance opening 15 for the pressure block 8 to pass through, and the bottom surface of the upper fixture 14 is provided with a first convex edge 16 extending outward (in the specific implementation process, the top surface of the upper fixture 14 is also provided with a convex edge extending outward, and the convex edge of the top surface is connected to the bottom surface of the pressure plate 12; and a plurality of reinforcing ribs are connected between the outer side wall of the upper fixture 14 and the convex edge of the top surface and the convex edge of the bottom surface), and a plurality of first step holes 17 are opened on the bottom surface of the first step hole 17. The inner diameter is larger than the inner diameter of the top surface, the inner diameter of the bottom surface of the first step hole 17 matches the outer diameter of the spring 18 and the washer 19 on the outside of the upper end plate 5 (the inner diameter of the bottom surface of the first step hole 17 is slightly larger than the outer diameter of the spring 18 and the washer 19), and the inner diameter of the top surface of the first step hole 17 matches the outer diameter of the tightening tool (such as a socket wrench, an electric wrench, etc.) of the nut 20 on the outside of the upper end plate 5 (the inner diameter of the top surface of the first step hole 17 is slightly larger than the outer diameter of the wrench, which makes it convenient for the wrench to extend into the first step hole 17 to tighten the nut 20).

[0041] The present invention can realize independent action of the first pressure mechanism and the second pressure mechanism by respectively opening the first avoidance opening 13 and the second avoidance opening 15 in the middle of the pressure plate 12 and the upper fixture 14, so as to facilitate the compression of the battery stack 4 and the spring 18 respectively; the spring 18 and the washer 19 are limited by a plurality of first step holes 17 on the first convex edge 16 on the bottom surface of the upper fixture 14, so as to facilitate the use of a tightening tool to tighten the nut 20 to the position of the washer 19 after the spring 18 is compressed.

[0042] Specifically, Figure 1 , 2 As shown, the third pressure mechanism includes a third telescopic driving component 21, and the base 1 is provided with a lower fixture 22 that cooperates with the spring 18 on the outer side of the lower end plate 6. The third telescopic driving component 21 is used to drive the lower fixture 22 to move upward to compress the spring 18 on the outer side of the lower end plate 6.

[0043] Furthermore, if Figure 4 , 5As shown in Figures 7 and 8, a bottom plate 23 is provided on the base 1, and a carrier 24 for carrying the battery stack 4 is provided in the middle of the top surface of the bottom plate 23; a third avoidance opening 25 is provided in the middle of the lower fixture 22 for the carrier 24 to pass through, the lower fixture 22 is sleeved on the outside of the carrier 24, and a second convex edge 26 extending outward is provided on the top surface of the lower fixture 22 (in the specific implementation process, the bottom surface of the lower fixture 22 is also provided with a convex edge extending outward, and the convex edge of the bottom surface is used to bear the thrust of the telescopic rod of the third telescopic driving component 21; and a plurality of reinforcing ribs are connected between the outer side wall of the lower fixture 22 and the top convex edge and the bottom convex edge), a plurality of second step holes 27 are opened on the top surface of the second step hole 27, the inner diameter of the top surface of the second step hole 27 is larger than the inner diameter of the bottom surface, and the top surface of the second step hole 27 The inner diameter matches the outer diameter of the spring 18 and the washer 19 on the outside of the lower end plate 6 (the inner diameter of the bottom surface of the second step hole 27 is slightly larger than the outer diameter of the spring 18 and the washer 19), and the inner diameter of the bottom surface of the second step hole 27 matches the outer diameter of the tightening tool (such as a socket wrench, an electric wrench, etc.) for the nut 20 on the outside of the lower end plate 6 (the inner diameter of the bottom surface of the second step hole 27 is slightly larger than the outer diameter of the wrench, which is convenient for the wrench to be inserted into the second step hole 27 to tighten the nut 20); a plurality of avoidance holes 28 are opened on the bottom plate 23, and the position of the avoidance holes 28 corresponds to the position of the third telescopic driving component 21. After the corresponding telescopic rod is driven by the third telescopic driving component 21 to pass through the avoidance hole 28 on the bottom plate 23, the lower fixture 22 is lifted up, so that the lower fixture 22 moves upward to compress the spring 18 on the outside of the lower end plate 6. By opening a third avoidance opening 25 in the middle part of the lower fixture 22, the independent action of the third pressure mechanism can be realized, so as to facilitate the compression of the spring 18 on the outer side of the lower end plate 6 of the fuel cell stack 4; the spring 18 and the washer 19 are limited by a plurality of second step holes 27 on the second convex edge 26 on the top surface of the lower fixture 22, so as to facilitate tightening the nut 20 to the position of the washer 19 using a tightening tool after the spring 18 is compressed.

[0044] Furthermore, if Figure 5 As shown, a plurality of positioning rings 29 are provided on the bottom surface of the second convex edge 26 of the lower fixture 22, and the outer diameter and position of the positioning ring 29 correspond to the inner diameter and position of the avoidance hole 28, and the inner diameter of the positioning ring 29 matches the outer diameter of the end of the telescopic rod of the third telescopic driving component 21. By arranging a plurality of positioning rings 29 on the bottom surface of the second convex edge 26 of the lower fixture 22, it is convenient to guide and position the end of the telescopic rod of the third telescopic driving component 21, and to facilitate the positioning of the lower fixture 22 with the bottom plate 23 when it falls back.

[0045] Furthermore, if Figure 4As shown, the thickness of the carrier 24 is greater than the thickness of the lower fixture 22, and the difference between the thickness of the carrier 24 and the thickness of the lower fixture 22 is d, the depth of the upper half of the second step hole 27 with a larger inner diameter is h, and the sum of the length of the spring 18 on the outer side of the lower end plate 6 in a natural state and the thickness of the gasket 19 is L, then the sum of d and h matches L; the purpose of such design is that when the battery stack 4 is placed on the lower fixture 22, the bottom surface of the lower end plate 6 of the battery stack 4 abuts against the top surface of the carrier 24, and the spring 18 and gasket 19 under the lower end plate 6 are both in an unpressurized state, thereby ensuring that the compression state of the springs 18 at both ends of the battery stack 4 is consistent.

[0046] Preferably, if Figure 1 , 2 As shown in Figures 5 and 6, a cushion seat 30 is provided on the base 1, and the cushion seat 30 is located below the bottom plate 23; a plurality of positioning protrusions 31 are provided on the top surface of the cushion seat 30, and a plurality of positioning holes 32 matching the positioning protrusions 31 are provided on the bottom surface of the bottom plate 23; a bracket 33 is provided on the base 1, and two parallel conveying lines 34 are provided on the bracket 33, and the top surface of the conveying line 34 is located below the bottom surface of the bottom plate 23, and the distance between the two conveying lines 34 is less than the width of the bottom plate 23; a lifting mechanism is provided below the bracket 33, and the lifting mechanism is used to drive the bracket 33 and the conveying line 34 to rise and fall. By arranging the cushion seat 30, the bracket 33, the conveying line 34 and the lifting mechanism on the base 1, the loading and unloading transportation of the battery stack 4 is facilitated, and the docking efficiency of the processes before and after the pressing of the battery stack 4 is improved.

[0047] Specifically, Figure 8 As shown, the lifting mechanism is provided with two groups, and the two groups of lifting mechanisms are respectively located at both ends of the bracket 33; the lifting mechanism includes a fourth telescopic driving component 35, and the fourth telescopic driving component 35 is fixedly mounted on the mounting plate 36, and the end of the telescopic rod of the fourth telescopic driving component 35 is fixedly connected to the bracket 33; a second linear bearing 37 is fixedly mounted on the bracket 33, and a second guide rod 38 is slidably mounted in the second linear bearing 37, and the bottom end of the second guide rod 38 is fixedly connected to the mounting plate 36.

[0048] In this embodiment, the first telescopic driving component 7, the second telescopic driving component 11, the third telescopic driving component 21, and the fourth telescopic driving component 35 can all use hydraulic cylinders or air cylinders as driving components.

[0049] The working process of the stack press-assembly equipment in this embodiment is as follows:

[0050] The battery stack 4 to be pressed is a stack that is neatly stacked but not pressed and fastened. The main body of the battery stack 4 includes an upper end plate 5, a current collector, several layers of single cells, a current collector and a lower end plate 6 from top to bottom.

[0051] In the initial state, the assembly of the bottom plate 23, the carrier 24 and the lower fixture 22 is located at the upper material position of the conveyor line body 34, the stacked body to be pressed is placed on the carrier 24, the washer 19 and the spring 18 on the outer side of the lower end plate 6 are sequentially placed into the second step hole 27 of the lower fixture 22, the screw 39 is sequentially passed through the upper end plate 5 and the lower end plate 6, and the spring 18, the washer 19 and the nut 20 are sequentially installed on the screw 39 on the outer side of the upper end plate 5, as shown in FIG. Fig. 9 As shown; since the top surface height of the lower fixture 22 is lower than the top surface height of the carrier 24, and the sum of the height difference between the two and the depth of the upper half of the second step hole 27 is slightly larger than the sum of the length of the spring 18 in the natural state and the thickness of the gasket, when the battery stack 4 is placed on the carrier 24, the bottom surface of the lower end plate 6 of the battery stack 4 abuts against the top surface of the carrier 24, and the spring 18 and the gasket 19 under the lower end plate 6 are in an unpressurized state.

[0052] The combination of the base plate 23, the carrier 24, the lower fixture 22 and the stacking body is transported to the pressing position (the position where the center of the battery stack 4 is aligned with the center of the pressing block 8) by means of the conveyor line 34. With the help of positioning sensing (photoelectric sensors can be used for positioning) and start-stop control, the positioning hole 32 on the bottom surface of the base plate 23 is aligned with the positioning protrusion 31 on the top surface of the pad 30.

[0053] Then, the fourth telescopic driving component 35 is used to drive the telescopic rod to shorten, and the bracket 33 slowly descends due to its own gravity and the force of the load. When the bottom plate 23 falls on the cushion seat 30, the bottom plate 23, the cushion seat 30, the lower fixture 22 and the stacked body are supported by the cushion seat 30; then, the fourth telescopic driving component 35 drives the telescopic rod to continue to shorten to the lowest point of the stroke, so that the conveying line body 34 is completely separated from the bottom plate 23, and the stacked body, the lower fixture 22, the carrier 24, and the bottom plate 23 are completely positioned on the cushion seat 30 and aligned concentrically and coaxially, as shown in FIG. Fig.10 , 11 shown.

[0054] Then, the first telescopic driving component 7 and the second telescopic driving component 11 are used to simultaneously drive the pressing block 8 and the pressing plate 12 to descend. When the pressing block 8 just abuts against the top surface of the upper end plate 5, the first step hole 17 of the upper fixture 14 is just outside the spring 18 and the gasket 19 on the outer side of the upper end surface. The upper fixture 14 can provide shape retention and positioning for the battery stack 4. At this time, the second telescopic driving component 11 stops driving, and only the first telescopic driving component 7 drives the pressing block 8 to continue to descend. The pressing block 8 continuously applies pressure to the upper end plate 5 of the stack, so that the gap between the layers of material in the battery stack 4 is evenly reduced until the thickness of the stack gradually decreases to the target molding thickness.

[0055] The second telescopic driving component 11 is then used to drive the pressing plate 12 to continue to descend until the large aperture part (lower half) of the first step hole 17 of the upper jig 14 covers the spring 18 and the washer 19 on the outside of the upper end plate 5; and then the upper jig 14 is driven downward and the lower jig 22 is driven upward by the second telescopic driving component 11 and the third telescopic driving component 21 respectively at the same time; the upper jig 14 presses downward and the lower jig 22 pushes upward, which will gradually compress the springs 18 at the upper and lower ends of the battery stack 4 from the free length to the target molding length.

[0056] At this point, the press-fitting process of the battery stack 4 is basically completed. Finally, the nuts 20 at the upper and lower ends of the screw 39 can be tightened by manually or by equipment operating the tightening tool (the inner diameter of the small-diameter part of the step hole of the upper fixture 14 and the lower fixture 22 is larger than the outer diameter of the tightening tool, which can support tightening tools such as hexagonal sockets to extend into the step hole to tighten the nut 20).

[0057] After all nuts 20 are fully tightened, the first telescopic drive component 7, the second telescopic drive component 11 and the third telescopic drive component 21 respectively drive the pressure block 8, the upper fixture 14 and the lower fixture 22 to retract to the initial position; the pressure block 8 and the pressure plate 12 will rise following the retraction of the first telescopic drive component 7 and the second telescopic drive component 11; the lower fixture 22 will fall back onto the bottom plate 23 due to its own gravity, and the positioning ring 29 on the bottom surface of the lower fixture 22 will be stuck in the avoidance hole 28 on the bottom plate 23.

[0058] Finally, the fourth telescopic driving component 35 is used to drive the bracket 33 to rise, and the bottom plate 23 is lifted up by the conveying line body 34 to separate the bottom plate 23 from the cushion seat 30. The conveying line body 34 carries the combination of the bottom plate 23, the carrier 24, the lower fixture 22 and the pressed battery stack 4; the conveying line body 34 can be used to transport the combination to the unloading position.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid flow battery stack press assembly device, characterized in that: The invention comprises a base (1), a top plate (2) and a plurality of guide columns (3), wherein the base (1) and the top plate (2) are fixedly connected via the plurality of guide columns (3); a first pressure mechanism and a second pressure mechanism are installed on the top plate (2), and a third pressure mechanism is provided on the base (1); the first pressure mechanism is used to cooperate with the base (1) to press the battery stack (4); the second pressure mechanism is used to compress downwards a spring (18) on the outer side of an upper end plate (5) of the battery stack (4), and the third pressure mechanism is used to compress upwards a spring (18) on the outer side of a lower end plate (6) of the battery stack (4).

2. A flow battery stack press-assembly device as claimed in claim 1, characterized in that: The first pressure mechanism comprises a first telescopic driving component (7), a pressure block (8) is installed at the bottom end of the first telescopic driving component (7); a plurality of first linear bearings (9) are installed on the top plate (2), a first guide rod (10) is slidably installed in the first linear bearing (9), the bottom end of the first guide rod (10) is connected to the pressure block (8), and the first telescopic driving component (7) is used to drive the pressure block (8) to move downward to cooperate with the base (1) to press the battery stack (4).

3. A flow battery stack press-assembly device as claimed in claim 1, characterized in that: The second pressure mechanism comprises a second telescopic driving component (11), a pressure plate (12) is installed at the bottom end of the second telescopic driving component (11), and a first avoidance opening (13) is provided in the middle of the pressure plate (12) for the first pressure mechanism to pass through; the pressure plate (12) is slidably connected to a plurality of guide columns (3), and an upper fixture (14) is provided on the bottom surface of the pressure plate (12) for cooperating with an outer spring (18) of an upper end plate (5) of the battery stack (4); the second telescopic driving component (11) is used to drive the pressure plate (12) and the upper fixture (14) to move downward to compress the spring (18) on the outer side of the upper end plate (5).

4. A flow battery stack press-assembly device as claimed in claim 3, characterized in that: A second avoidance opening (15) is provided in the middle of the upper fixture (14) for the first pressure mechanism to pass through, and a first convex edge (16) extending outward is provided on the bottom surface of the upper fixture (14). A plurality of first step holes (17) are provided on the bottom surface of the first convex edge (16). The inner diameter of the bottom surface of the first step hole (17) is larger than the inner diameter of the top surface. The inner diameter of the bottom surface of the first step hole (17) matches the outer diameter of the spring (18) and the washer (19) on the outer side of the upper end plate (5), and the inner diameter of the top surface of the first step hole (17) matches the outer diameter of the tightening tool of the nut (20) on the outer side of the upper end plate (5).

5. The liquid flow battery stack press assembly equipment according to claim 1, characterized in that: The third pressure mechanism comprises a third telescopic driving component (21), and the base (1) is provided with a lower fixture (22) that cooperates with the spring (18) on the outer side of the lower end plate (6), and the third telescopic driving component (21) is used to drive the lower fixture (22) to move upward to compress the spring (18) on the outer side of the lower end plate (6).

6. A flow battery stack press-assembly device as claimed in claim 5, characterized in that: The base (1) is provided with a bottom plate (23), and a carrier (24) for carrying a battery stack (4) is provided in the middle of the top surface of the bottom plate (23); a third avoidance opening (25) for the carrier (24) to pass through is provided in the middle of the lower fixture (22), the lower fixture (22) is sleeved on the outside of the carrier (24), and a second convex edge (26) extending outward is provided on the top surface of the lower fixture (22), and a plurality of second step holes (27) are opened on the top surface of the second convex edge (26), the inner diameter of the top surface of the second step hole (27) is greater than the inner diameter of the bottom surface, and the inner diameter of the top surface of the second step hole (27) is equal to the inner diameter of the bottom surface. The outer diameters of the spring (18) and the washer (19) on the outer side of the plate (6) match each other, and the inner diameter of the bottom surface of the second step hole (27) matches the outer diameter of the tightening tool of the nut (20) on the outer side of the lower end plate (6); a plurality of avoidance holes (28) are opened on the bottom plate (23), and the positions of the avoidance holes (28) correspond to the positions of the third telescopic driving component (21). The third telescopic driving component (21) drives the corresponding telescopic rod to pass through the avoidance hole (28) on the bottom plate (23) to lift the lower fixture (22), so that the lower fixture (22) moves upward to compress the spring (18) on the outer side of the lower end plate (6).

7. A flow battery stack press-assembly device as claimed in claim 6, characterized in that: A plurality of positioning rings (29) are provided on the bottom surface of the second convex edge (26) of the lower fixture (22); the outer diameter and position of the positioning rings (29) correspond to the inner diameter and position of the avoidance hole (28); and the inner diameter of the positioning rings (29) matches the outer diameter of the end of the telescopic rod of the third telescopic driving component (21).

8. A flow battery stack press-assembly device as claimed in claim 6, characterized in that: The thickness of the carrier (24) is greater than the thickness of the lower fixture (22), and the difference between the thickness of the carrier (24) and the thickness of the lower fixture (22) is d, the depth of the upper half of the second step hole (27) with a larger inner diameter is h, and the sum of the length of the outer spring (18) of the lower end plate (6) in a natural state and the thickness of the washer (19) is L, then the sum of d and h matches L.

9. A flow battery stack press-assembly device as claimed in claim 6, characterized in that: The base (1) is provided with a cushion seat (30), and the cushion seat (30) is located below the bottom plate (23); the top surface of the cushion seat (30) is provided with a plurality of positioning protrusions (31), and the bottom surface of the bottom plate (23) is provided with a plurality of positioning holes (32) matching the positioning protrusions (31); the base (1) is provided with a bracket (33), and the bracket (33) is provided with two parallel conveying line bodies (34), the top surface of the conveying line bodies (34) is located below the bottom surface of the bottom plate (23), and the distance between the two conveying line bodies (34) is less than the width of the bottom plate (23); a lifting mechanism is provided below the bracket (33), and the lifting mechanism is used to drive the bracket (33) and the conveying line body (34) to rise and fall.

10. A flow battery stack press-assembly device as claimed in claim 9, characterized in that: The lifting mechanism is provided with two groups, and the two groups of lifting mechanisms are respectively located at two ends of the bracket (33); the lifting mechanism comprises a fourth telescopic driving component (35), the fourth telescopic driving component (35) is fixedly mounted on the mounting plate (36), and the end of the telescopic rod of the fourth telescopic driving component (35) is fixedly connected to the bracket (33); a second linear bearing (37) is fixedly mounted on the bracket (33), a second guide rod (38) is slidably mounted in the second linear bearing (37), and the bottom end of the second guide rod (38) is fixedly connected to the mounting plate (36).

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