CN214956974U

CN214956974U - Flow battery galvanic pile liquid flow frame structure

Info

Publication number: CN214956974U
Application number: CN202121592981.5U
Authority: CN
Inventors: 孟琳; 刘学军
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-11-30
Anticipated expiration: 2031-07-14

Abstract

The utility model relates to the technical field of flow batteries, in particular to a flow battery galvanic pile flow frame structure, which comprises a first flow frame and a second flow frame, wherein the first flow frame and the second flow frame are alternately stacked and welded layer by layer to form a galvanic pile, the front side of the first flow frame is provided with a first groove, and the back side of the first flow frame is provided with a first boss; the front surface of the second liquid flow frame is provided with a second boss, and the back surface of the second liquid flow frame is provided with a second groove; the first liquid flow frame and the second liquid flow frame are made of materials capable of transmitting laser, and the first boss, the second boss, the first welding area and the second welding area are made of absorbable laser coloring materials made of the same materials. The utility model discloses a redox flow battery galvanic pile liquid stream frame structure has solved among the prior art limited technical problem of welding part thickness that laser welding brought because of liquid stream frame laser transmissivity problem, has also solved the restriction on technologies such as the welding position needs coloring treatment alone, has improved laser welding's production efficiency, has reduced laser welding's technical threshold, and is sealed effectual, and the rejection rate is low.

Description

Flow battery galvanic pile liquid flow frame structure

Technical Field

The utility model relates to a flow battery technical field, more specifically the utility model relates to a flow battery galvanic pile liquid stream frame structure that says so.

Background

Electrochemical flow batteries, commonly referred to as redox flow batteries, are a new type of large electrochemical energy storage device. The conventional flow batteries mainly comprise all-vanadium flow batteries, zinc-bromine flow batteries, iron-chromium flow batteries, zinc-manganese flow batteries, zinc-air flow batteries and the like. The flow battery is a novel electric storage energy storage device, generally has the advantages of long service life, environmental friendliness, high safety and the like, is mainly applied to the fields of power grid peak shaving, power generation of renewable energy sources such as wind energy and solar energy and the like, can improve the stability of a power grid, and ensures the safety of the power grid.

The galvanic pile is a core component of a flow battery system and is a site for providing electrochemical reactions. The galvanic pile of the flow battery system generally adopts a bipolar plate structure, and multiple layers are superposed and connected in series. The stack generally includes terminal electrodes (lead electrodes), a diaphragm or diaphragm assembly, a bipolar plate assembly, and fastening end plates.

Stack leakage is a relatively common failure of flow battery systems. The packaging of the electric stack is one of the key technologies of the flow battery, and is directly related to the reliability and safety of the electric stack.

In the current electric pile packaging method, the sealing between the sheets mainly has four forms: firstly, rely on the packing of rubber pad to seal. Secondly, the plate frame is pressed and sealed by the protruding ribs and the corresponding grooves of the plate frame. And thirdly, vibration friction welding sealing. Fourthly, laser welding.

The pressing seal of the rubber gasket is realized by processing a groove for placing the rubber gasket or the rubber ring at the position to be sealed on the surface of the plate frame, placing the rubber gasket or the rubber ring in the groove of each layer of plate frame in the packaging process, stacking all the components, and fastening the whole end plates at two ends by using bolts to complete the packaging of the galvanic pile. The sealing gasket and the sealing ring are complex in placement process, not easy to fix and low in production efficiency. After the electric pile is used for a long time, the sealing material is easy to age, the elasticity is poor, and the leakage of the electric pile is caused.

The plate frame is pressed and sealed by the protruding ribs and the corresponding grooves of the plate frame, so that the placing process of a sealing gasket or a sealing ring can be omitted, and the process is relatively simple. However, when the sealing ribs are pressed for a long time, the material can creep and gradually lose elasticity, and the leakage of the galvanic pile is easy to occur. In addition, the large change of the environment temperature and the operation temperature of the electric pile can also cause the expansion and contraction of the plate frame material, and affect the sealing performance between the plates.

The vibration friction welding sealing is to use a vibration friction welding machine to weld various plate frames layer by layer until the whole galvanic pile is packaged. Although the plate frame can be welded and sealed layer by the process, a special structure is required to be designed at the welding position and a special welding mold is required, and along with the increase of the number of stacked layers and accumulated errors, the process control difficulty is high and the rejection rate is high. In addition, the heat generated in the welding process is large, so that the plate frame or the bipolar plate and the membrane assembly deform to different degrees, the liquid flow distribution in the electric pile is further influenced, and the electric pile performance is influenced.

The laser welding encapsulation welding is firm, and the welded part warp for a short time, and the leakproofness is good. However, due to the process limitation of laser welding, the upper layer component to be welded needs to have good laser transmittance, the lower layer component cannot transmit laser, and the thickness of the welded component is limited.

In view of the above problems, it is an urgent technical problem to be solved by those skilled in the art to provide a stack liquid flow frame structure suitable for a stack soldering package.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem who exists among the prior art to a certain extent. Therefore, the utility model provides a galvanic pile liquid flow frame structure suitable for stromatolite welding encapsulation, especially be applicable to laser stromatolite welded galvanic pile liquid flow frame structure, liquid flow frame thickness is unrestricted.

Specifically, the utility model discloses a galvanic pile liquid flow frame structure divide into two kinds of structures according to the welding track difference, is first liquid flow frame and second liquid flow frame respectively, and when the galvanic pile stromatolite encapsulation, the first liquid flow frame of two kinds of structures and the galvanic pile that the second liquid flow frame was overlapped in turn and the successive layer welded, the front of first liquid flow frame is equipped with the first recess that is close to the edge and winds around a frame a week, and its back is equipped with the first boss that is close to the edge and winds around a frame a week, the distance of first recess apart from the edge is less than the distance of first boss apart from the edge, the planar region of first boss apart from the edge is first welding area, the front of second liquid flow frame is equipped with the second boss that is close to the edge and winds around a frame a week, and the back is equipped with the second recess that is close to the edge and winds around a frame a week, the second recess distance the edge length of second liquid flow frame equals the first boss apart from the edge length of first liquid flow frame, the length of the second boss from the edge of the second flow frame is equal to the length of the first groove from the edge of the first flow frame, the width of the second groove is greater than or equal to the width of the first boss, and the width of the second boss is less than or equal to the width of the first groove; the first liquid flow frame and the second liquid flow frame are made of materials capable of transmitting laser, and the first boss, the second boss, the first welding area and the second welding area are made of absorbable laser coloring materials made of the same materials.

Furthermore, the thickness of the first welding area is 0.5-5 mm, and the groove width of the first groove is 2-10 mm.

Preferably, the thickness of the first welding area is 1-2.5 mm, and the width of the first groove is 3-6 mm.

Furthermore, the thickness of the second welding area is 0.5-5 mm, and the groove width of the second groove is 2-10 mm.

Preferably, the thickness of the second welding area is 1-2.5 mm, and the groove width of the second groove is 3-6 mm.

Further, the color of the absorbable laser coloring material may be any color that absorbs laser energy, and preferably, the absorbable laser coloring material is a black material.

Further, the first fluid frame is composed of one or more transparent or semitransparent laser-permeable materials.

Further, the second fluid frame is composed of one or more transparent or semitransparent laser-permeable materials.

Preferably, the laser-transmissive material is (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer (ABS).

The utility model discloses a pile flow frame structure can be used to different thickness and material flow frame, is applicable to the pile of different battery systems such as full vanadium redox flow battery, zinc bromine redox flow battery, iron chromium redox flow battery zinc manganese redox flow battery, zinc air redox flow battery. The liquid flow frame is particularly suitable for a galvanic pile liquid flow frame structure for laser lamination welding, and the thickness of the liquid flow frame is not limited.

Compared with the prior art, the utility model discloses an overall technical effect lies in: 1. the welding area is provided with a liquid flow frame structure with a groove and a boss, so that the thickness of the welding area is not restricted by the thickness of the liquid flow frame; 2. the welding area can penetrate laser; 3. the boss part is made of laser absorption materials; 4. the liquid flow frame can be formed by double-shot injection molding in one step. Based on above-mentioned technological effect, the technical scheme of the utility model the laser welding is limited because of the welding part thickness that liquid stream frame laser transmissivity problem brought among the prior art has been solved, and the welding part needs restriction on technologies such as independent coloring treatment, has greatly improved laser welding's production efficiency, has reduced laser welding's technical threshold, when having guaranteed the sealed effect of encapsulation, has reduced the rejection rate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a front view of a first fluidic frame in an embodiment of the present invention;

FIG. 2 is a cut-away view A-A of FIG. 1;

FIG. 3 is an enlarged view at X in FIG. 2;

FIG. 4 is a back view of a first fluidic frame in an embodiment of the present invention;

fig. 5 is a front view of a second fluidic block in an embodiment of the present invention;

FIG. 6 is a cross-sectional view of B-B of FIG. 5;

FIG. 7 is an enlarged view at Y in FIG. 6;

fig. 8 is a back view of a second fluidic block in an embodiment of the present invention;

FIG. 9 is a schematic view of two-layer overlay welding in an embodiment of the present invention;

FIG. 10 is a cross-sectional view of C-C in FIG. 9;

FIG. 11 is an enlarged view at Z of FIG. 10;

fig. 12 is a schematic view of multilayer overlapping welding in the embodiment of the present invention;

FIG. 13 is a cross-sectional view of D-D in FIG. 12;

FIG. 14 is an enlarged view at G of FIG. 13;

FIG. 15 is a schematic diagram of a conventional cell stack configuration;

fig. 16 is an external view of a conventional battery cell stack after packaging.

Wherein:

1-a first flow frame, 101-a first groove, 102-a first boss, 103-a first weld region;

2-a second fluidic frame, 201-a second boss, 202-a second groove, 203-a second weld zone;

301-electrolyte inlet and outlet, 302-fastening end plate, 303-terminal electrode, 304-membrane component and 305-electrode plate component;

s1 — first welding trace; s2 — second weld trace.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example (b):

the embodiment of the utility model provides a following implementation:

a flow battery galvanic pile flow frame structure comprises a plurality of layers of first flow frames 1 and second flow frames 2, wherein the first flow frames 1 and the second flow frames 2 of the two structures are alternately stacked and welded layer by layer, so that the whole galvanic pile is packaged;

as shown in fig. 1-4, a first groove 101 surrounding the first flow frame 1 is formed on the front surface of the first flow frame 1, a first boss 102 surrounding the first flow frame 1 is formed on the back surface of the first flow frame 1, the length of the first groove 101 from the edge of the first flow frame 1 is less than the length of the first boss 102 from the edge of the first flow frame 1, the first boss 102 from the edge plane of the first flow frame 1 is a first welding area 103, the thickness of the first welding area 103 is m, and the groove width of the first groove 101 is n;

as shown in fig. 5-8, the front surface of the second flow frame 2 is provided with a second protrusion 201 surrounding the frame for one circle, the back surface is provided with a second groove 202 surrounding the frame for one circle, the length of the second groove 202 from the edge of the second flow frame 2 is equal to the length of the first protrusion 102 from the edge of the first flow frame 1, the length of the second protrusion 201 from the edge of the second flow frame 2 is equal to the length of the first groove 101 from the edge of the first flow frame 1, the plane of the second protrusion 201 from the edge of the second flow frame 2 is a second welding area 203, the thickness of the second welding area 203 is e, and the width of the second groove 202 is f;

in the present embodiment, the thickness m of the first welding region 103 is 1mm, and the groove width n of the first groove 101 is 3 mm; the thickness e of the second welding region 203 is 1mm, and the groove width f of the second groove 202 is 3 mm;

in this embodiment, the material of the first flow frame 1 and the second flow frame 2 is selected from one or more of transparent or translucent laser-transparent materials, such as Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene (ABS).

In this embodiment, the material of the first boss 102 and the second boss 201 is a coloring material capable of absorbing the laser energy, and is preferably black.

As shown in fig. 9-11, the second flow frame 2 is stacked on the first flow frame 1, and welded along the first welding trace S1 to package the two flow frames together.

As shown in fig. 12-14, in the multilayer flow frame packaging process, the first flow frame 1 and the second flow frame 2 are alternately stacked, and the welding is performed along the first welding track S1 and the second welding track S2, and the layers are stacked and welded until the whole stack packaging is completed.

As shown in fig. 15-16, the conventional flow cell packaging structure includes an electrolyte inlet and outlet 301, a fastening end plate 302, an end electrode 303, a membrane assembly 304, and an electrode assembly 305, which are stacked and connected in series, and then integrally fastened from both ends of the fastening end plate 302 by fastening bolts, so as to complete the packaging of the stack. After the electric pile is used for a long time, the sealing material is easy to age, the elasticity is poor, and the leakage of the electric pile is caused.

The structure in the embodiment can be used for liquid flow frames with different thicknesses and materials, and is suitable for galvanic piles of different battery systems such as an all-vanadium liquid flow battery, a zinc-bromine liquid flow battery, an iron-chromium liquid flow battery, a zinc-manganese liquid flow battery, a zinc-air liquid flow battery and the like; compared with the traditional flow battery pile structure, the thickness of the flow frame is not limited, the welding process is easy to control, and the welding tightness is good.

In some preferred embodiments, the thickness m of the first welding region 103 is 2.5mm, and the groove width n of the first groove 101 is 6 mm; the thickness e of the second welding zone 203 is 2.5mm and the groove width f of the second groove 202 is 6 mm.

In other preferred embodiments, the thickness m of the first welding region 103 is 0.5 to 5mm, and the groove width n of the first groove 101 is 2 to 10 mm; the thickness e of the second welding region 203 is 0.5-5 mm, and the width f of the second groove 202 is 2-10 mm.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A flow cell pile flow frame structure is characterized by comprising a plurality of layers of piles which are alternately stacked and welded layer by a first flow frame (1) and a second flow frame (2), wherein the front surface of the first flow frame (1) is provided with a first groove (101) close to the edge and wound around the frame in a circle, the back surface of the first flow frame (1) is provided with a first boss (102) close to the edge and wound around the frame in a circle, the distance from the first groove (101) to the edge is smaller than the distance from the first boss (102) to the edge, the planar area of the back surface of the first groove (101) is a first welding area (103), the front surface of the second flow frame (2) is provided with a second boss (201) close to the edge and wound around the frame in a circle, the back surface of the second flow frame (2) is provided with a second groove (202) close to the edge and wound around the frame in a circle, the edge length of the second groove (202) from the second flow frame (2) is equal to the edge length of the first boss (102) from the first flow frame (1), the edge length of the second boss (201) from the second liquid flow frame (2) is equal to the edge length of the first groove (101) from the first liquid flow frame (1), the back of the second groove (202) is a second welding area (203), the groove width of the second groove (202) is greater than or equal to the width of the first boss (102), and the width of the second boss (201) is less than or equal to the groove width of the first groove (101); the first liquid flow frame (1) and the second liquid flow frame (2) are made of materials which can penetrate through laser, and the first boss (102), the second boss (201), the first welding area (103) and the second welding area (203) are made of coloring materials which can absorb laser and are made of the same materials.

2. A flow cell stack flow frame structure according to claim 1, wherein the thickness of the first welding region (103) is 0.5-5 mm, and the groove width of the first groove (101) is 2-10 mm.

3. A flow cell stack flow frame structure according to claim 2, wherein the thickness of the first welding region (103) is 1-2.5 mm, and the width of the first groove (101) is 3-6 mm.

4. A flow cell stack flow frame structure according to claim 1, wherein the thickness of the second welding region (203) is 0.5-5 mm, and the groove width of the second groove (202) is 2-10 mm.

5. A flow cell stack flow frame structure according to claim 4, wherein the thickness of the second welding region (203) is 1-2.5 mm, and the width of the second groove (202) is 3-6 mm.

6. A flow battery cell stack flow frame structure as claimed in any one of claims 1-5, wherein the absorbable laser colored material is a black material.

7. A flow battery cell stack flow frame structure as claimed in claim 6, characterized in that said first flow frame (1) is composed of one or more transparent or translucent laser permeable materials.

8. A flow battery cell stack flow frame structure as claimed in claim 6, characterized in that said second flow frame (2) is composed of one or more transparent or translucent laser permeable materials.

9. A flow battery cell stack flow frame structure as claimed in claim 7 or 8, wherein the laser permeable material is polyethylene or polypropylene or polyvinyl chloride or acrylonitrile-butadiene-styrene copolymer.