CN112271315A

CN112271315A - Assembly process of electric pile sealing plate

Info

Publication number: CN112271315A
Application number: CN202011158331.XA
Authority: CN
Inventors: 陈继军; 杨江涛; 唐升智; 范志刚
Original assignee: Leshan Shengjia Electric Co ltd
Current assignee: Leshan Shengjia Electric Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-01-26

Abstract

The invention discloses an electric pile sealing plate assembling process, wherein the local part of the sealing plate is welded and connected with the side surface of an electric pile in the stacking direction by laser welding so as to pre-connect the sealing plate on the electric pile; and welding wires are welded along the surface of the seal plate by adopting laser welding, the welding wires cover the whole welding area between the seal plate and the side face of the electric pile, and a first acting force which is perpendicular to the seal plate and is used for attaching the seal plate to the side face of the electric pile is applied when the welding wires are welded, so that the seal plate assembly is finally completed. According to the invention, the sealing plate is pre-connected to the galvanic pile and then the welding operation of the whole welding area is carried out, so that the position stability of the sealing plate is ensured, the displacement is avoided, the assembly process of the sealing plate is more convenient and efficient, the welding precision of the sealing plate is improved, the sealing plate is ensured to be tightly attached to the side surface of the galvanic pile by the first acting force, the gap between the sealing plate and the side surface of the galvanic pile is avoided, the welding connection uniformity and the sealing property are improved, the permeation and leakage of electrolyte are effectively avoided, and the service life of.

Description

Assembly process of electric pile sealing plate

Technical Field

The invention relates to the technical field of flow battery assembly, in particular to an electric pile sealing plate assembly process.

Background

The flow battery is an electrochemical energy storage device, utilizes the separated and respectively circulated positive and negative electrolytes, has the characteristics of high capacity, wide application field and long cycle service life, and is a new energy product. The bipolar plate is one of the key components of the flow battery, a negative electrode of a first-stage single battery and a positive electrode of a next-stage single battery are connected in the battery, and electrolytes on two sides are respectively a negative electrolyte of the first-stage single battery and a positive electrolyte of the next-stage single battery. The flow battery is mainly formed by repeatedly laminating a battery unit and a diaphragm to form a galvanic pile, wherein the battery unit is mainly formed by laminating a guide plate, a bipolar plate and a guide plate, and the guide plate and the bipolar plate are usually connected in a mode of injection molding, bonding, welding, chemical combination and the like to achieve sealing. The assembly of pile needs to adopt the tool to come to press from both sides the tight compactness of guarantee with range upon range of battery cell and diaphragm earlier, then carry out the shrouding assembly in order to reach sealedly to the side all around of range upon range of battery cell and diaphragm, current pile shrouding assembly process is difficult to the assembly quality of guarantee shrouding, the assembly efficiency of shrouding is low, the precision is low, the shrouding is relatively poor with the connection compactness of pile side, there is the space easily, the sealing reliability, the durability is relatively poor, electrolyte infiltration leakage's situation takes place easily, redox flow battery's poor reliability, short service life.

Disclosure of Invention

The invention aims to solve the technical problems and provide a technical task for improving the prior art, and provides an electric pile sealing plate assembling process, which solves the problems that the electric pile sealing plate in the prior art is poor in assembling quality and low in precision, the sealing effect between the sealing plate and the side face of an electric pile is poor, and the reliability and the service life of a flow battery are influenced.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a process for assembling a stack seal plate includes:

welding and connecting the local part of the sealing plate with the side surface of the stack in the stacking direction by laser welding so as to pre-connect the sealing plate on the stack;

and welding wires are welded along the surface of the seal plate by adopting laser welding, the welding wires cover the whole welding area between the seal plate and the side face of the electric pile, and a first acting force which is perpendicular to the seal plate and is used for attaching the seal plate to the side face of the electric pile is applied when the welding wires are welded, so that the seal plate assembly is finally completed.

The electric pile sealing plate assembling process of the invention firstly pre-connects the sealing plate to the electric pile, ensures that the sealing plate is stable in position and can not shift, does not need to add an additional fixing device for the sealing plate, ensures that the sealing plate assembling process is more convenient, simple and efficient, effectively ensures that the subsequent welding operation on a welding area can be accurately carried out, ensures that the sealing plate can be tightly attached to the side surface of the electric pile when the welding operation of the whole welding area is carried out, avoids the gap between the sealing plate and the side surface of the electric pile, realizes the tight welding connection, further improves the connection stability, improves the connection tightness, effectively avoids the situation of electrolyte seepage leakage of a flow battery, improves the flatness of the sealing plate after the assembling by the first acting force, avoids the warping, ensures that the sealing plate is tightly connected with the side surface of the electric pile on the whole surface, and further ensures the sealing performance of the sealing plate assembling, the reliability of the flow battery is improved, and the service life of the flow battery is prolonged.

Further, carry out the shrouding assembly in two at least sides of pile simultaneously, effectively improve assembly efficiency, shorten process time, and both sides assemble the guarantee assembly precision that the shrouding also can be further simultaneously, when carrying out the shrouding assembly to pile one side alone, probably because the situation that the aversion appears in the pile stacking element in the effect of welding fusion leads to the pile, and then lead to carrying out the shrouding assembly to the opposite side of pile between the stacking element in shrouding and the pile when being difficult to whole abundant laminating, thereby influence the assembly precision of shrouding, influence the assembly leakproofness.

Further, go out a plurality of fixed bonding wires in advance through laser welding between shrouding and the pile side in order to connect the shrouding in advance on the pile, fixed shrouding efficient, easy operation to the fastness is good, avoids the shrouding to take place to shift in subsequent processing, improves the assembly precision.

Furthermore, the pre-fixed welding wires are straight-line welding wires, the pre-fixed welding wires are distributed in parallel at intervals, the sealing plate can be uniformly and stably connected to the electric pile in advance, the flatness of the sealing plate can be guaranteed, excessive warping of the sealing plate is avoided, and therefore in the subsequent assembling process, the sealing plate can be effectively and tightly attached to the side face of the electric pile on the whole face, the assembling quality is improved, and the sealing performance of sealing plate assembling is guaranteed.

Furthermore, the welding wires are parallel linear wires at intervals, and the distance between every two adjacent linear wires is 0.5-2 mm; or the welding wires are nested multi-layer annular wires, and the distance between adjacent annular wires is 0.5-2 mm; or the welding wire is a spiral wire, and the distance between the spiral wires is 0.5-2 mm. The side face of the sealing plate and the side face of the electric pile can be fully and uniformly welded together in the whole welding area, the purpose of surface contact connection is achieved, the assembling quality of the sealing plate is improved, the connection sealing performance and the connection stability are effectively improved, the situation of electrolyte seepage leakage is avoided, the reliability of the flow battery is guaranteed, and the service life of the flow battery is prolonged.

Furthermore, a welding head for laser welding is pressed on the sealing plate to apply a first acting force, so that the sealing plate can be tightly attached to the surface of the electric pile without an additional clamp, the implementation cost is lower, the pressure applied by the welding head is 0.1-0.5 MPa, the welding frequency is 40-100 Hz, the sealing plate is tightly attached to the side face of the electric pile, the welding tightness is improved, the sealing performance is improved, and the situation of electrolyte seepage and leakage is effectively avoided.

Further, the side of the range upon range of direction of pile carries out the plane processing earlier so that the side of pile reaches the roughness requirement to clear away burr and overlap, then carry out the shrouding assembly again, thereby the roughness shrouding that improves the pile side can just closely laminate with the pile side is even and abundant carrying on in whole welding area, avoids shrouding and pile side to have the space, thereby effectively improves the welding leakproofness and the reliability of shrouding and pile.

Furthermore, a second acting force along the stacking direction of the electric pile is kept to be applied to the electric pile in the whole sealing plate assembling process, the second acting force enables all stacking elements in the electric pile to be tightly attached together, the stacking elements in the electric pile comprise battery units and diaphragms, the battery units and the diaphragms are repeatedly stacked to form the electric pile, each battery unit mainly comprises a guide plate, a bipolar plate and a stack of the guide plates, the battery units and the diaphragms are tightly attached under the second acting force, so that the electrolytes of the positive and negative electrodes are effectively separated, the sealing and isolating effects in the electric pile are guaranteed, the situation that the electrolytes of the positive and negative electrodes permeate and mix flow is avoided, the reliability of the flow battery is guaranteed, the sealing plate is assembled under the condition that the second acting force is applied to the electric pile, the second acting force is removed after the sealing plate is completely welded with the side face of the electric pile, and the sealing plate can play a role in keeping, the shrouding prevents that cell and diaphragm from taking place relative displacement, keeps long-term stable sealed isolation effect between cell and the diaphragm promptly, avoids because the fluid pressure of electrolyte leads to appearing the clearance, avoids appearing the situation of the electrolyte infiltration mixed flow of positive negative pole to improve flow battery's assembly quality, increase of service life.

Further, a second acting force in the stacking direction of the galvanic pile is applied to the galvanic pile by adopting a press-fitting clamp, the press-fitting clamp comprises a pull rod assembly and two press plates which are parallel to each other, connecting seats extending out of the outer sides of the edges of the press plates are arranged on the press plates, a plurality of connecting seats are arranged on the edges of the press plates at intervals in the whole circumferential direction, and two ends of the pull rod assembly are respectively connected with the connecting seats on the two press plates, so that the galvanic pile which is positioned between the press plates and is perpendicular to the press plates in the stacking direction is pressed and fixed by the two press. The clamp plate that connects through draw bar assembly can fully compress tightly the pile, and it is inseparable to ensure laminating that battery cell and diaphragm in the pile can be abundant, ensures the leakproofness, ensures that battery cell is effectively kept apart by the diaphragm, ensures redox flow battery's performance reliability, and the connecting seat that outwards extends reserves sufficient space for the shrouding assembly, avoids taking place to interfere with the soldered connection that is used for welding the shrouding, and the reliable going on of guarantee shrouding assembling process ability, and then guarantee shrouding assembly precision and leakproofness.

Furthermore, the shrouding pass through hold-down mechanism and press on the side of pile, hold-down mechanism include preforming and transparent plate, shrouding, transparent plate and preforming outwards set gradually from the side of pile, the transparent plate cover whole shrouding, preforming and clamp plate edge spiro union, the edge that the transparent plate was pushed down to the preforming so that the transparent plate pastes the shrouding to the pile side and lean on. The pressing mechanism adopted by the invention has simple structure, can apply uniform pressure covering the whole surface of the sealing plate, and ensures that the whole surface of the sealing plate is effectively and tightly attached to the side surface of the electric pile, thereby improving the welding quality and the sealing property

Furthermore, a welding assisting material layer is arranged between the sealing plate and the side face of the electric pile, the welding assisting material layer is changed into a molten state under the action of laser so as to connect the sealing plate and the side face of the electric pile in a welding coupling mode, the sealing plate and the side face of the electric pile can be welded together more fully and uniformly by the aid of the welding assisting material layer, and welding stability and sealing performance are improved.

Furthermore, the welding assistant material layer is an independent sheet layer, so that the production and the manufacture are easy, and the use flexibility is good; or the welding-assistant material layer is prefabricated on the sealing plate or the side surface of the galvanic pile, so that the structure is compact, the number of components is small, and the assembly efficiency is high.

Compared with the prior art, the invention has the advantages that:

according to the electric pile sealing plate assembling process, the sealing plate is pre-connected to the electric pile, then the welding operation of the whole welding area is carried out, the stable position of the sealing plate is ensured not to shift, the sealing plate assembling process is more convenient and efficient, the sealing plate welding precision is improved, the sealing plate can be tightly attached to the side face of the electric pile under the action of the first acting force, gaps are avoided between the sealing plate and the side face of the electric pile, tight welding connection is achieved, the connection stability is improved, the connection sealing performance is improved, the situation that electrolyte permeates and leaks from the flow battery is effectively avoided, the flatness of the assembled sealing plate is improved, warping is avoided, the reliability of the flow battery is improved, and the service life of the flow battery is prolonged.

Drawings

FIG. 1 is a schematic structural diagram of a process for assembling a stack sealing plate;

FIG. 2 is a schematic view of the mounting station;

FIG. 3 is a schematic view of the press-fitting jig being engaged with a first set of positioning holes on the turntable;

FIG. 4 is a schematic view of the press-fitting jig engaging a second set of locating holes in the turntable;

FIG. 5 is a schematic structural view of a press-fitting jig;

FIG. 6 is a schematic side view of the pressing mechanism;

FIG. 7 is a schematic view of the structure of the tablet.

FIG. 8 is a schematic view of the pre-fixing of the sealing plates to the stack;

FIG. 9 is a schematic view of a first manner of soldering traces;

FIG. 10 is a diagram illustrating a second manner of soldering traces;

FIG. 11 is a third exemplary embodiment of a trace soldering process;

FIG. 12 is a diagram illustrating a fourth manner of soldering traces;

fig. 13 is a structural diagram illustrating a welding assistant material layer disposed between the sealing plate and the side surface of the stack.

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.

The electric pile sealing plate assembling process disclosed by the embodiment of the invention can effectively improve the assembling quality of the sealing plate, improve the assembling precision and ensure that the sealing plate can be tightly attached to the surface of an electric pile, so that the connection stability and tightness between the sealing plate and the surface of the electric pile are improved, the sealing effect is effectively improved, the situation of electrolyte permeation and leakage is avoided, the reliability of a flow battery is improved, and the service life of the flow battery is prolonged.

Example one

A kind of electric pile shrouding assembly process, mainly:

the side surface of the stack in the stacking direction is firstly subjected to plane processing to enable the side surface of the stack to meet the flatness requirement, a boring machine and a milling machine can be used for carrying out plane processing on the side surface of the stack, burrs and flashes are removed after the flatness meets the requirement, then the sealing plate assembly is carried out, and the whole surface of the sealing plate can be fully attached to the side surface of the stack only after the side surface of the stack meets the flatness requirement, so that the sealing plate can be fully welded and connected with the side surface of the stack, the residual gap between the sealing plate and the side surface of the stack is avoided, and the assembly sealing performance is improved;

keeping applying a second acting force along the stacking direction of the electric pile to the electric pile in the whole sealing plate assembling process, enabling the battery units in the electric pile to be tightly attached to the diaphragm, so that the electrolytes of the anode and the cathode are effectively separated, the sealing and isolating effect in the galvanic pile is ensured, the condition of the permeation and mixed flow of the electrolytes of the anode and the cathode is avoided, the reliability of the flow battery is ensured, the seal plates are welded and assembled under the action of keeping the second action force, after the seal plates are fully welded and connected with the battery units in the electric pile, the seal plates play a role in keeping the battery units and the diaphragm tightly attached, the second acting force is cancelled after the sealing plate is assembled, the battery unit and the diaphragm can not generate relative displacement and still keep a close fit state under the action of the sealing plate, thereby ensuring the long-acting stable sealing and isolating effect, and ensuring the performance and the service life of the flow battery;

then, the local part of the sealing plate is welded and connected with the side face of the stack in the stacking direction by laser welding to pre-connect the sealing plate on the stack, so that the position of the sealing plate is stable and can not shift in the subsequent welding and assembling process, the subsequent welding and assembling can be accurately carried out, the sealing plate assembling precision is improved, an additional fixing device for the sealing plate is not required to be added by adopting a local welding mode, and the operation is more convenient, simpler and more efficient;

and then, laser welding is adopted to weld the wiring along the surface of the sealing plate, the welding wiring covers the whole welding area between the sealing plate and the side face of the electric pile, a first acting force which is perpendicular to the sealing plate and used for attaching the sealing plate to the side face of the electric pile is applied when the wiring is welded, and the sealing plate assembly is completed after the welding wiring covers the whole welding area.

In this embodiment, for raise the efficiency, shorten process time, carry out the shrouding assembly simultaneously in two sides of pile, particularly, carry out the assembly of shrouding simultaneously in two pairs of sides of pile, promptly, carry out the shrouding assembly simultaneously according to aforementioned pile shrouding assembly process simultaneously to two pairs of sides of pile, the assembly precision of improvement shrouding that can also improve the assembly leakproofness.

In this embodiment, as shown in fig. 8, when the sealing plate 6 is pre-attached to the stack, a plurality of pre-fixing bonding wires 8 are welded between the sealing plate and the side surface of the stack by laser welding, the pre-fixed welding lines 8 are straight line segment welding lines, the plurality of pre-fixed welding lines 8 are distributed in parallel at intervals, three pre-fixed welding lines 8 are arranged in total, the pre-fixed welding lines 8 are straight line segment welding lines along the transverse direction, the three pre-fixing welding wires 8 are distributed at intervals in the vertical direction, so that the sealing plate is effectively pre-fixed on the electric pile, the sealing plate is prevented from displacing during the subsequent welding of the whole welding area, the flatness of the sealing plate can be guaranteed, the sealing plate is prevented from being excessively warped, and then ensure in subsequent assembling process, the shrouding can both be with the effectual inseparable laminating of side of galvanic pile on the whole face, improve the welding assembly precision of shrouding, guarantee welding quality.

The mode of pre-connecting the shrouding at the pile is not limited to above-mentioned mode, can also be through the welding point that laser welding goes out a plurality of interval distribution, these welding points are the matrix distribution in the whole welding area between shrouding and pile side, the same situation that fixed shrouding avoided its emergence displacement in follow-up assembling process can be played, can also make the shrouding can both with the effectual inseparable laminating of side of pile on the whole face, the roughness of guarantee shrouding, avoid the shrouding to take place excessive warpage, improve the welding assembly precision of shrouding, guarantee welding quality.

First effort press through the soldered connection that laser welding used and apply on the shrouding, and need not to set up anchor clamps alone, it is specific the pressure that the soldered connection was applyed is 0.1 ~ 0.5MPa, and welding frequency is 40 ~ 100Hz, first effort is applyed all the time in the splice, can effectively eliminate the thermal stress that the molten bath thermal expansion that the splice melting produced, the internal stress that produces in the effective elimination molten bath solidification process, and then can effectively avoid molten bath thermal expansion to lead to shrouding warpage or deformation, thereby can ensure the plane degree of shrouding, make the whole face of shrouding can both reach even laminating with the side of pile, improve the assembly precision of shrouding, avoid appearing the situation that the clearance leads to the rosin joint between shrouding and the pile side, improve welding stability, improve welding leakproofness.

In this embodiment, the welding traces 9 are linear traces spaced in parallel, the distance between adjacent linear traces is 0.5-2 mm, specifically, as shown in fig. 9, a welding head for laser welding performs horizontal trace welding from left to right from the position of "0" at the upper left corner of the welding area to form a linear welding line, the welding head is displaced downward by a certain distance, and then performs horizontal trace welding from left to right to form a second linear welding line, so as to perform welding connection in the whole welding area in a reciprocating manner, as shown in fig. 10, the welding trace 9 may also be a welding head for laser welding performs horizontal trace welding from left to right from the position of "0" at the upper left corner of the welding area to form a linear welding line, and then performs horizontal trace welding from right to left after the welding head is displaced downward by a certain distance to form a second linear welding line, and then the welding head is moved downwards for a certain distance and then is welded by transversely routing from left to right to form a third straight welding line, so that the welding connection of the whole welding area is realized in a reciprocating manner, and compared with the first mode, the second mode reduces the idle running process of the welding head returning from right to left, so that the time required for completing the welding of the whole welding area is shorter in the second mode, and the machining efficiency is relatively higher.

Or, as shown in fig. 11, the welding trace 9 is a nested multilayer annular trace, the distance between adjacent annular traces is 0.5-2 mm, and the welding may be performed from the outer region of the welding region to the central region, or from the central region of the welding region to the outer region; or, as shown in fig. 12, the welding trace 9 is a spiral trace, the pitch of the spiral trace is 0.5-2 mm, the welding can be performed from the outer region to the central region of the welding region, or from the central region to the outer region of the welding region, so that the sealing plate and the side face of the stack can be uniformly and sufficiently welded in the whole welding region, the connection sealing performance and the connection stability are improved, the assembly quality of the sealing plate is improved, and the electrolyte permeation and leakage are avoided.

In the present embodiment, in order to perform the above-described stack sealing plate assembling process, the following stack sealing plate assembling system is used;

as shown in fig. 1 to 5, the stack seal plate assembly system mainly includes a welding system 1, a press-fitting fixture 2 and an assembly table 3, the press-fitting fixture 2 is used for clamping and pressing a stack 4 of a stacked structure to apply a second acting force to the stack 4 along a stack stacking direction, the press-fitting fixture 2 clamping the stack 4 is positioned and placed on the assembly table 3, the welding system 1 includes a controller 11, a moving assembly 12 and a welding assembly 13, the controller 11 controls the moving assembly 12 to drive the welding assembly 13 to move so as to weld and assemble a seal plate 6 to the stack 4 on the assembly table 3, the controller 11 includes a main control unit, a human-computer interface and the like, the moving assembly drives the welding assembly to weld and route the welding assembly under the control of the controller, and automatically connects the seal plate to the side of the stack.

The moving assembly 12 and the welding assembly 13 are provided with a plurality of groups to weld and assemble the seal plates to the electric pile 4 at the same time, the seal plate welding connection can be performed to the same side of the electric pile 4 at the same time, or the seal plate welding connection can be performed to different sides of the electric pile 4 at the same time, in this embodiment, a mode of performing the seal plate welding connection to different sides of the electric pile 4 at the same time is preferably adopted, specifically, two groups of moving assemblies 12 and welding assemblies 13 are provided together, and the two groups of moving assemblies 12 and welding assemblies 13 are distributed at two opposite sides of the electric pile, the two moving assemblies 12 respectively drive the welding assemblies 13 connected with the moving assemblies to perform the welding and assembling to the two opposite sides of the electric pile 4 at the same time, in this embodiment, the moving assembly 12 adopts a mechanical arm, the welding assembly 13 is a laser welding mechanism, and in the welding process, the moving assembly 12 drives the welding assembly 13 to, that is, the movable assembly 12 drives the welding assembly 13 to apply a first acting force to the seal plate, and the welding assembly 13 applies pressure to the welding position to enable the seal plate to be tightly attached to the side face of the electric pile 4, so that the seal plate can be welded together with the electric pile side face stability, the seal plate assembly precision is improved, the assembly tightness is improved, and the situation of electrolyte permeation leakage is avoided.

Assembly bench 3 mainly include base 31 and rotate the revolving stage 32 that sets up on base 31, revolving stage 32 on be provided with along rotating circumference's ring gear, actuating mechanism drives revolving stage 32 through the gear with ring gear meshing and rotates, the pressure equipment anchor clamps 2 that are holding galvanic pile 4 place in on the revolving stage 32 to carry out spacingly through positioning mechanism 5 between pressure equipment anchor clamps 2 and the revolving stage 32, ensure that pressure equipment anchor clamps 2 place the precision on the revolving stage 32, also avoid revolving stage 32 to take place relative displacement between rotation in-process pressure equipment anchor clamps 2 and the revolving stage 32 simultaneously, further can also avoid welding assembly's in-process galvanic pile to take place to shift, the guarantee galvanic pile position is stable all the time, thereby the welding assembly precision of guarantee shrouding.

The positioning mechanism 5 comprises positioning pins and positioning holes matched with the positioning pins, the positioning pins are arranged on the press-fitting fixture 2, the positioning holes are arranged on the rotary table 32, two groups of positioning holes are arranged on the rotary table 32, when the press-fitting fixture 2 holding the galvanic pile 4 is respectively matched with the two groups of positioning holes, the galvanic pile 3 faces different directions, the two directions are mutually vertical, specifically, as shown in figures 3 and 4, the press-fitting fixture 2 is integrally rectangular, the galvanic pile 4 held in the press-fitting fixture 2 is also rectangular, that is, the side surface of the sealing plate to be assembled of the galvanic pile comprises a long side and a short side, the positioning pins are arranged in the diagonal direction of the press-fitting fixture 2, the positioning holes matched with the positioning pins are correspondingly arranged on the rotary table, and the first group of positioning holes on the rotary table enables the long side of the galvanic pile on the press-fitting fixture 2 to face the, the second group of positioning holes on the rotary table enable the short edge of the galvanic pile on the press-fitting fixture 2 to face the welding machining device, so that the galvanic pile can reach an accurate position under the condition that the rotary table does not rotate, and the machining precision and quality of the sealing plate are guaranteed.

A locking mechanism 33 for locking the turntable 2 after the turntable 32 rotates in place is further arranged between the base 31 and the turntable 32, so as to further ensure the accuracy of the turntable in place and avoid the turntable from shifting in the assembling process of the sealing plate, the locking mechanism 33 comprises a telescopic pin assembly 331 and a locking part 332, at least one of the telescopic pin assembly 331 and the locking part 332 is distributed at intervals along the rotation circumference of the turntable 32, the telescopic pin assembly 331 is arranged on the base 31, the locking part 332 is arranged on the turntable 32, specifically, the locking part 332 is a V-shaped groove, the telescopic pin assembly 331 comprises a wedge-shaped pin head matched with the V-shaped groove, when the wedge-shaped pin is inserted into the V-shaped groove, the inclined surfaces of the V-shaped groove and the wedge-shaped pin head can push the turntable, so that the turntable slightly rotates to reach a high-accuracy position, and the electric pile reaches an accurate orientation, thereby improving the precision of the closing plate assembly.

Specifically, the press-fitting fixture 2 includes a pull rod assembly 22 and two press plates 21 parallel to each other, a connecting seat 23 extending to the outer side of the edge of the press plate 21 is arranged on the press plate 21, the press plate 21 is rectangular, the connecting seat 23 is arranged at each of four vertex angles of the press plate 21, the connecting seats are fixed on the press plate in a welding manner, two ends of the pull rod assembly 22 are respectively connected with the connecting seats 23 on the two press plates 21, so that the two press plates 21 can move in opposite directions to realize a pressing function, specifically, the press plates 21 are parallel to battery units and diaphragms in the stack 4, that is, the press plates 21 are perpendicular to the stacking direction of the stack 4, the press plates 21 are respectively arranged at two sides of the stacking direction of the stack 4, the two press plates 21 press and fix the stack 4 located between the press plates under the action of the pull rod assembly 22, the pull rod assembly 22 is along the stacking direction, the pull rod assembly 22 specifically include pull rod and nut, the pull rod be sharp shaft-like to one end is provided with the spacing cap portion that peripheral dimension is greater than the pull rod diameter, the other end is provided with the screw thread section, the spacing cap portion card of pull rod one end is on the connecting seat of a clamp plate, the other end of pull rod is then card on the connecting seat of another clamp plate behind the nut on the suit, through revolving the nut in order to pull in two clamp plates, thereby compress tightly fixedly with the pile that is located between two clamp plates, and, offer at the edge of connecting seat 23 with pull rod assembly 22 complex breach groove 24, pull rod assembly 22's pull rod along the plane direction card of clamp plate 21 the breach groove can, improve pull rod assembly 22's the convenience of installing and removing.

In this embodiment, the surface of the side of the pressing plate 21, which faces away from the cell stack 4, is further provided with three reinforcing bars 25, the three reinforcing bars 25 are arranged in parallel at intervals, so that the structural strength of the pressing plate is improved, the flatness of the pressing plate is improved, the battery cells and the separators which are stacked together can be uniformly and tightly attached to each other on the whole plane, and the stacking assembly quality is improved.

Example two

On the basis of the first embodiment, the closing plate is pressed on the side surface of the electric pile through the pressing mechanism, and the pressing mechanism is used for applying a first acting force to the closing plate, specifically, as shown in fig. 6 and 7, the pressing mechanism 7 comprises a pressing sheet 71 and a transparent plate 72, the closing plate 6, the transparent plate 72 and the pressing sheet 71 are sequentially arranged from the side surface of the electric pile 4 to the outside, the transparent plate 72 covers the whole closing plate 6, the edge of the pressing plate 21 is provided with a screw hole, the pressing sheet 71 is in threaded connection with the edge of the pressing plate 21, the pressing sheet 71 presses the edge part of the transparent plate 72 so that the transparent plate 72 presses and attaches the closing plate 6 to the side surface of the electric pile, the pressing sheet 71 can be a plurality of sheets covering the edge of the transparent plate 72 for a small distance, the pressing sheet 71 can also be a frame-shaped structure covering the whole edge of the transparent plate 72, the middle hollow area of the frame-shaped structure is the welding area of the, can ensure through hold-down mechanism 7 that shrouding 6 is all even and inseparable laminating to the pile side on the whole face, improve the welding assembly quality of shrouding, ensure that the banding all with pile zonulae occludens on the whole face, improve the assembly leakproofness, effectively avoid flow battery to appear the situation of electrolyte leakage infiltration, the laser of welding subassembly 13 can directly pass transparent plate 72 then be used in on the shrouding for the welding-assisted layer melting between shrouding and the pile is in the same place shrouding and pile welding.

And, in welding process, can also press the welding subassembly 13 that laser welding used on the transparent plate, further provide first effort, guarantee shrouding and galvanic pile side can closely laminate, improve welding quality, improve assembly leakproofness.

EXAMPLE III

As shown in fig. 13, in addition to the first embodiment, a welding assistant material layer 10 is further disposed between the sealing plate 6 and the side surface of the stack 4, the welding assistant material layer 10 is changed into a molten state under the action of laser to weld and couple the sealing plate and the side surface of the stack together, and the welding assistant material layer may be a separate sheet material layer, or the welding assistant material layer may be pre-formed on the sealing plate or on the side surface of the stack.

The welding-assistant material layer mainly comprises a main material and a color additive, the main material can be consistent with the materials of the sealing plate and the guide plate, the main material is a thermoplastic high polymer material and specifically comprises but is not limited to polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyformaldehyde, polycarbonate, polyamide, acrylic plastics, other polyolefins and copolymers thereof, polysulfone, polyphenyl ether and the like, the color additive comprises but is not limited to pigments with the light transmittance of less than 40% such as black, dark blue and the like, and the better welding effect can be ensured; and moreover, the main material of the welding material is consistent with the materials of the sealing plate and the guide plate, the fusion of the welding material with the sealing plate and the guide plate is better, and the welding stability and the sealing property are improved.

Under the effect of first effort, the shrouding, help welding material layer and galvanic pile side hug closely together to ensure that shrouding and galvanic pile side are in the same place through helping the inseparable welding of welding material layer, eliminate the thermal stress that the molten bath thermal energy that the welding department melting produced, effectively eliminate the internal stress that produces in the molten bath solidification process, and then can effectively avoid the molten bath thermal energy to lead to shrouding warpage or deformation, thereby can ensure the plane degree of shrouding, improve assembly quality, improve the assembly leakproofness.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. A process for assembling a stack seal plate, comprising:

2. A stack closure plate assembly process according to claim 1, wherein closure plate assembly is performed on at least two sides of the stack simultaneously.

3. A process for assembling a seal plate for a fuel cell stack as claimed in claim 1, wherein a plurality of pre-attached weld lines are laser welded to the seal plate and the sides of the stack to pre-attach the seal plate to the stack.

4. The assembly process of a stack sealing plate according to claim 3, wherein the pre-fixing welding lines are straight line-shaped welding lines, and the plurality of pre-fixing welding lines are distributed at intervals in parallel.

5. The stack seal plate assembly process according to claim 1, wherein the welding wires are parallel linear wires with a spacing between adjacent linear wires being 0.5-2 mm; or the welding wires are nested multi-layer annular wires, and the distance between adjacent annular wires is 0.5-2 mm; or the welding wire is a spiral wire, and the distance between the spiral wires is 0.5-2 mm.

6. The assembly process for a stack sealing plate according to claim 1, wherein a welding head for laser welding is pressed against the sealing plate to apply a first force, the pressure applied by the welding head is 0.1-0.5 MPa, and the welding frequency is 40-100 Hz.

7. The assembly process of a sealing plate for a stack as claimed in claim 1, wherein the side faces of the stack in the stacking direction are subjected to a surface processing to make the side faces of the stack flat, and burrs and flashes are removed, and then the sealing plate is assembled.

8. A stack sealing plate assembling process according to any one of claims 1 to 7, wherein the second force in the stack stacking direction is kept applied to the stack throughout the plate assembling process.

9. A process for assembling a seal plate for a galvanic pile according to claim 8, wherein the press-fitting jig is adapted to apply a second force to the galvanic pile in the stacking direction of the galvanic pile, and comprises a plurality of tie members and two parallel press plates, wherein the press plates are provided with connecting seats extending outward of the edges of the press plates, the connecting seats are spaced apart from each other along the entire circumference of the edges of the press plates, and both ends of the tie members are connected to the connecting seats of the two press plates, respectively, so that the two press plates can press and fix the galvanic pile between the press plates and perpendicular to the press plates in the stacking direction.

10. The assembly process of claim 9, wherein the sealing plate is pressed against the side surface of the electric pile by a pressing mechanism, the pressing mechanism comprises a pressing piece and a transparent plate, the sealing plate, the transparent plate and the pressing piece are sequentially arranged from the side surface of the electric pile, the transparent plate covers the whole sealing plate, the pressing piece is in threaded connection with the edge of the pressing plate, and the pressing piece presses the edge of the transparent plate so that the sealing plate is attached to the side surface of the electric pile by the transparent plate.

11. A process for assembling a seal plate for a fuel cell stack as claimed in any one of claims 1 to 7, wherein a layer of flux material is provided between the seal plate and the side face of the stack.

12. The assembly process for a stack sealing plate according to claim 11, wherein the layer of welding flux material is a separate sheet layer; or the welding assistant material layer is prefabricated on the sealing plate or the side surface of the galvanic pile.