Integrated pile end plate and flow battery

Abstract

The invention discloses an integrated pile end plate and a flow battery, the integrated pile end plate comprises a structural plate and an insulating plate arranged on one side of the structural plate, and the structural plate and the insulating plate are provided with a plurality of mounting holes; a plurality of runner mold grooves are formed in the structural plate, and a plurality of electrolyte runners which are not communicated with one another are arranged on the insulating plate; the electrolyte flow channel is embedded in the flow channel mold groove; the flow battery comprises a positive electric pile, a negative electric pile and a bipolar plate arranged between the positive electric pile and the negative electric pile, wherein the two sides of the positive electric pile and the negative electric pile are packaged through an integrated electric pile end plate and a screw rod fixing piece. According to the invention, the end plate and the liquid inlet plate of the original structure of the flow battery are integrated, so that the number of galvanic pile parts is reduced, and the weight of the galvanic pile is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical energy storage, and in particular relates to an integrated battery stack end plate and a liquid flow battery. Background Art

[0002] A flow battery is an electrochemical battery in which chemical energy is provided by two chemical components dissolved in a liquid. These liquids are pumped to different sides of the stack's ion membrane, and ion exchange occurs through the membrane. The two liquids circulate in their respective spaces along with the flow of current. The entire process enables the battery to be charged and discharged. The core component of a flow battery is the stack, which is where the battery is charged and discharged. In order for the stack to meet the requirements of output voltage and power, the stack is generally composed of dozens of single cells connected in series, with positive and negative electrode liquid inlet plates and structural end plates placed on both sides, and by applying pressure to the structural end plates, bolts are used to package them into a whole.

[0003] Common flow battery stack structures in the prior art include Figure 1 As shown, it includes two structural end plates 1 arranged at the outermost sides of the battery stack structure, two liquid inlet plates 2 arranged on the opposite surfaces of the two structural end plates 1, and a battery stack 3 arranged between the two liquid inlet plates 2; when the battery stack is working, the positive and negative electrolytes enter and exit the battery stack 3 through the liquid inlet plates 2 for circulation. The structural end plates 1 in the flow battery are often required to have a certain strength to avoid structural deformation during pressure packaging, and the liquid inlet plates 2 are often required to have a certain insulation to avoid leakage and electrochemical corrosion.

[0004] In summary, due to the requirements of structural strength, the structural end plates in liquid flow batteries are usually made of thick steel plates or aluminum plates. Due to the requirements of insulation, the liquid inlet plates are usually made of PVC plates. In the existing technology, the structural end plates and liquid inlet plates are independently arranged, and each plate only realizes a single function. Moreover, these two plates are made very thick, which increases the weight, volume and number of parts of the battery stack, which is not conducive to the lightweight of the battery. Summary of the invention

[0005] In order to overcome the problem of large volume and weight of the battery stack caused by the independent arrangement of the structural end plate and the liquid inlet plate of the liquid flow battery in the prior art, the present invention provides the following technical solution:

[0006] An integrated battery stack end plate comprises a structural plate and an insulating plate arranged on one side of the structural plate, wherein: the structural plate and the insulating plate are provided with a plurality of mounting holes; the structural plate is provided with a plurality of flow channel mold grooves, and the insulating plate is provided with a plurality of electrolyte flow channels which are not interconnected; the electrolyte flow channels are embedded in the flow channel mold grooves.

[0007] Furthermore, the structural plate is a metal plate, and the insulating plate is a plastic plate; the insulating plate is injection molded on one side of the structural plate.

[0008] Furthermore, the mounting holes are arranged around the outer edges of the structural plate and the insulating plate, and penetrate the structural plate and the insulating plate perpendicularly to the plate surfaces, and the positions of the mounting holes on the structural plate and the insulating plate correspond one to one.

[0009] Furthermore, the flow channel mold groove is arranged on the surface of the structural plate opposite to the insulating plate, the electrolyte flow channel is arranged on the surface of the insulating plate opposite to the structural plate, the flow channel mold groove is used for injection molding to form the electrolyte flow channel, and the electrolyte flow channel is used for the entry and exit of the electrolyte; the flow channel mold groove on the structural plate includes an inlet flow channel mold groove and an outlet flow channel mold groove; the electrolyte flow channel on the insulating plate includes an inlet flow channel and an outlet flow channel.

[0010] Furthermore, the insulating plate is provided with a plurality of power inlet ports and a plurality of power outlet ports, and the power inlet ports and the power outlet ports are arranged on the surface opposite to the insulating plate and the structural plate; the power inlet ports are connected to the inlet flow channel, and the power outlet ports are connected to the outlet flow channel.

[0011] Furthermore, the insulating plate has the same shape as the structural plate, and a current collecting plate mounting groove is provided on the insulating plate. The current collecting plate mounting groove is provided on the opposite surface of the insulating plate and the structural plate, and is used for mounting the current collecting plate.

[0012] Furthermore, the structural plate and the plastic plate are both rectangular, the inlet runner mold groove and the outlet runner mold groove are opened along the length direction of the structural plate and penetrate the structural plate; the inlet runner and the outlet runner are injection molded corresponding to the inlet runner mold groove and the outlet runner mold groove respectively, and the inlet runner and the outlet runner penetrate the insulating plate along the length direction of the insulating plate.

[0013] Furthermore, there are two groups of mounting holes on the insulating board, namely long side mounting holes and short side mounting holes. The long side mounting holes are symmetrically arranged on the outer edges of the long sides on both sides of the insulating board along the length direction of the board, and the short side mounting holes are symmetrically arranged on the outer edges of the short sides on both sides of the insulating board along the width direction of the board. The mounting holes on the insulating board correspond one-to-one to the mounting holes on the structural board.

[0014] Furthermore, the long side mounting holes on the structural plate are arranged on the outer edge of the structural plate outside the inlet runner mold groove and the outlet runner mold groove, and the short side mounting holes are arranged on the outer edge of the structural plate between the inlet runner mold groove and the outlet runner mold groove; the long side mounting holes on the insulating plate are arranged on the outer edge of the insulating plate outside the inlet runner and the outlet runner, and the short side mounting holes are arranged on the outer edge of the insulating plate between the inlet runner and the outlet runner.

[0015] An integrated liquid flow battery comprises a positive battery stack, a negative battery stack and a bipolar plate arranged between the positive battery stack and the negative battery stack. Both sides of the positive battery stack and the negative battery stack are packaged by an integrated integrated battery stack end plate and a screw fixing member.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The integrated stack end plate combines the original structural end plate and liquid inlet plate of the flow battery into one, reducing the number of stack parts and reducing the weight of the stack.

[0018] 2. The structural plate provides effective strength support for the battery to offset the deformation caused by the huge pressure during battery stack packaging.

[0019] 3. The insulating plate provides a channel for the electrolyte to enter and exit the battery to avoid corrosion caused by contact between the electrolyte and the structural plate.

[0020] 4. The insulating plate and the structural plate are sufficiently isolated, providing sufficient insulation distance and creepage distance for the battery stack, thereby improving insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a liquid flow battery in the prior art.

[0022] Figure 2 It is a schematic diagram of the overall structure of the integrated fuel cell stack end plate in the present invention.

[0023] Figure 3 It is a schematic diagram of the explosion structure of the integrated fuel cell stack end plate in the present invention.

[0024] Figure 4 It is a schematic diagram of the overall structure of the integrated liquid flow battery in the present invention.

[0025] In the figure:

[0026] 1-structural end plate, 2-liquid inlet plate, 3-cell stack, 4-integrated cell stack end plate, 5-structural plate, 6-insulating plate;

[0027] 31-positive battery stack, 32-negative battery stack, 33-bipolar plate, 34-screw fixing member;

[0028] 41-mounting hole, 411-long side mounting hole, 412-short side mounting hole;

[0029] 51-runner mold groove, 511-inlet runner mold groove, 512-outlet runner mold groove;

[0030] 61-electrolyte flow channel, 611-inlet flow channel, 612-outlet flow channel;

[0031] 62 - battery stack inlet, 63 - battery stack outlet, 64 - current collecting plate mounting slot. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Combination Figure 2 and Figure 3 As shown, the integrated stack end plate 4 provided by the present invention comprises a structural plate 5 and an insulating plate 6 arranged on one side of the structural plate 5, wherein: a plurality of mounting holes 41 are arranged on the structural plate 5 and the insulating plate 6 for packaging the flow battery stack; a plurality of flow channel mold grooves 51 are opened on the structural plate 5, and a plurality of electrolyte flow channels 61 which are not interconnected are arranged on the insulating plate 6 for electrolyte to enter and exit; the electrolyte flow channel 61 is embedded in the flow channel mold groove 51. After the tube wall of the electrolyte flow channel 61 is embedded in the flow channel mold groove 51, the structural plate 5 and the insulating plate 6 form a thin plate structure as a whole, and the structural plate can well protect and provide strength support for the electrolyte flow channel 61.

[0034] In another embodiment, the structural plate 5 is a metal plate, preferably made of aluminum alloy, cast iron and other materials, and the insulating plate 6 is a plastic plate, preferably made of PP, PPS and other materials; the structural plate 5 is mass-produced using a die-casting or pouring process, and the insulating plate 6 is injection molded on one side of the structural plate 5.

[0035] In another embodiment, the mounting holes 41 are arranged around the outer edges of the structural plate 5 and the insulating plate 6, and penetrate the structural plate 5 and the insulating plate 6 perpendicular to the plate surface, and the positions of the mounting holes 41 on the structural plate 5 and the insulating plate 6 correspond one to one; the mounting holes 41 are used to encapsulate the end of the battery stack through fixing parts, such as screws.

[0036] In another embodiment, the runner mold groove 51 is arranged on the surface opposite to the structural plate 5 and the insulating plate 6, and the electrolyte flow channel 61 is arranged on the surface opposite to the insulating plate 6 and the structural plate 5. The runner mold groove 51 is used for injection molding to form the electrolyte flow channel 61, and the electrolyte flow channel 61 is used for the entry and exit of the electrolyte; the runner mold groove 51 on the structural plate 5 includes an inlet runner mold groove 511 and an outlet runner mold groove 512; the electrolyte flow channel 61 on the insulating plate 6 includes an inlet flow channel 611 and an outlet flow channel 612.

[0037] In another embodiment, a plurality of stack inlets 62 and a plurality of stack outlets 63 are provided on the insulating plate 6. The stack inlets 62 and the stack outlets 63 are provided on the surface opposite to the insulating plate 6 and the structural plate 5. The stack inlets 62 are connected to the inlet flow channel 611, and the stack outlets 63 are connected to the outlet flow channel 612. The electrolyte enters and exits the stack through the stack inlets 62 and the stack outlets 63 (not shown in the figure).

[0038] In another embodiment, a current collecting plate mounting groove 64 is further provided on the insulating plate 6. The current collecting plate mounting groove 64 is provided on the surface opposite to the insulating plate 6 and the structural plate 5 and is used to install a current collecting plate (not shown in the figure). The shape of the current collecting plate mounting groove 64 varies according to the appearance of different current collecting plates and is not limited here.

[0039] In another embodiment, the insulating plate 6 and the structural plate 5 have the same shape.

[0040] In another embodiment, the structural plate 5 and the insulating plate 6 are both rectangular, and the inlet runner mold groove 511 and the outlet runner mold groove 512 are opened along the length direction of the structural plate 5 and penetrate the structural plate 5;

[0041] The inlet flow channel 611 and the outlet flow channel 612 are formed by injection molding corresponding to the inlet flow channel mold groove 511 and the outlet flow channel mold groove 512 respectively, and the inlet flow channel 611 and the outlet flow channel 612 penetrate the insulating plate 6 along the length direction of the insulating plate 5 .

[0042] In another embodiment, the mounting holes 41 are all clear holes.

[0043] In another embodiment, the mounting holes 41 on the insulating plate 6 are divided into two groups, namely long side mounting holes 411 and short side mounting holes 412. The long side mounting holes 411 are symmetrically arranged on the outer edges of the long sides of the insulating plate 6 along the length direction of the plate, and the short side mounting holes 412 are symmetrically arranged on the outer edges of the short sides of the insulating plate 6 along the width direction of the plate. The mounting holes on the insulating plate 6 correspond one-to-one to the mounting holes on the structural plate 5.

[0044] In another embodiment, the long side mounting holes 411 on the structural plate 5 are arranged on the outer edge of the long side of the structural plate outside the inlet runner mold groove 511 and the outlet runner mold groove 512, and the short side mounting holes 412 are arranged on the outer edge of the short side of the structural plate between the inlet runner mold groove 511 and the outlet runner mold groove 512; the long side mounting holes 411 on the insulating plate 6 are arranged on the outer edge of the long side of the insulating plate outside the inlet runner 611 and the outlet runner 612, and the short side mounting holes 412 are arranged on the outer edge of the short side of the insulating plate between the inlet runner 611 and the outlet runner 612.

[0045] The present invention also provides a liquid flow battery, such as Figure 4As shown, it includes a positive battery stack 31, a negative battery stack 32 and a bipolar plate 33 arranged between the positive battery stack 31 and the negative battery stack 32. Both sides of the positive battery stack 31 and the negative battery stack 32 are packaged by an integrated integrated battery stack end plate 4 and a screw fixing 34; the electrolyte enters the battery stack through the integrated integrated battery stack end plate 4, and after completing the discharge at the bipolar plate 33, it is recovered through the integrated integrated battery stack end plate 4; the setting of the integrated integrated battery stack end plate 4 combines the original structural end plate and liquid inlet plate of the liquid flow battery into one, thereby reducing the number of battery stack parts and reducing the weight of the battery stack.

[0046] The liquid flow battery provided by the present invention fixes the integrated stack end plates 4 to the two sides of the stack 3 by screw fixings 34 before use, and then connects the electrolyte to start working.

[0047] The working principle of the integrated battery stack end plate provided by the present invention is as follows: the electrolyte enters the integrated battery stack end plate 4 through the inlet flow channel 611, and enters the battery through the inlet port 62 to work, and the electrolyte after work enters the outlet flow channel 612 through the outlet port 63, thereby realizing recovery. The above describes in detail the preferred specific embodiments of the present invention. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An integrated stack end plate, characterized in that: The invention comprises a structural plate (5) and an insulating plate (6) arranged on one side of the structural plate (5), wherein: a plurality of mounting holes (41) are arranged on the structural plate (5) and the insulating plate (6); a plurality of flow channel mold grooves (51) are opened on the structural plate (5); a plurality of electrolyte flow channels (61) which are not connected to each other are arranged on the insulating plate (6); and the electrolyte flow channels (61) are embedded in the flow channel mold grooves (51).

2. The integrated fuel cell stack end plate according to claim 1, characterized in that: The structural plate (5) is a metal plate, and the insulating plate (6) is a plastic plate; the insulating plate (6) is injection-molded on one side of the structural plate (5), and the flow channel mold groove (51) is used to form an electrolyte flow channel (61) by injection molding, and the electrolyte flow channel (61) is used for the inlet and outlet of electrolyte.

3. The integrated fuel cell stack end plate according to claim 1, characterized in that: The mounting holes (41) are arranged around the outer edges of the structural plate (5) and the insulating plate (6), and penetrate the structural plate (5) and the insulating plate (6) perpendicularly to the plate surfaces, and the positions of the mounting holes (41) on the structural plate (5) and the insulating plate (6) correspond one to one.

4. The integrated fuel cell stack end plate according to claim 1, characterized in that: The flow channel mold groove (51) is arranged on the surface of the structural plate (5) opposite to the insulating plate (6), and the electrolyte flow channel (61) is arranged on the surface of the insulating plate (6) opposite to the structural plate (5); the flow channel mold groove (51) on the structural plate (5) includes an inlet flow channel mold groove (511) and an outlet flow channel mold groove (512); the electrolyte flow channel (61) on the insulating plate (6) includes an inlet flow channel (611) and an outlet flow channel (612).

5. The integrated fuel cell stack end plate according to claim 4, characterized in that: The insulating plate (6) is also provided with a plurality of power inlet ports (62) and a plurality of power outlet ports (63), and the power inlet ports (62) and the power outlet ports (63) are provided on the surface of the insulating plate (6) opposite to the structural plate (5); the power inlet ports (62) are connected to the inlet flow channel (611), and the power outlet ports (63) are connected to the outlet flow channel (612).

6. The integrated fuel cell stack end plate according to claim 1, characterized in that: The insulating plate 6 is also provided with a current collecting plate installation groove 64 . The current collecting plate installation groove 64 is provided on the surface of the insulating plate 6 opposite to the structural plate 5 and is used for installing the current collecting plate.

7. The integrated fuel cell stack end plate according to claim 4, characterized in that: The structural plate (5) and the insulating plate (6) are both rectangular, the inlet flow channel mold groove (511) and the outlet flow channel mold groove (512) are opened along the length direction of the structural plate (5) and penetrate the structural plate (5); the inlet flow channel (611) and the outlet flow channel (612) are respectively formed by injection molding corresponding to the inlet flow channel mold groove (511) and the outlet flow channel mold groove (512), and the inlet flow channel (611) and the outlet flow channel (612) penetrate the insulating plate (6) along the length direction of the insulating plate.

8. The integrated fuel cell stack end plate according to claim 4, characterized in that: The mounting holes (41) on the insulating plate (6) are divided into two groups, namely long side mounting holes (411) and short side mounting holes (412). The long side mounting holes (411) are symmetrically arranged on the outer edges of the long sides of the insulating plate (6) along the length direction of the plate, and the short side mounting holes (412) are symmetrically arranged on the outer edges of the short sides of the insulating plate (6) along the width direction of the plate. The mounting holes on the insulating plate (6) correspond one-to-one to the mounting holes on the structural plate (5).

9. The integrated fuel cell stack end plate according to claim 8, characterized in that: The long side mounting holes (411) on the structural plate (5) are arranged on the outer edge of the long side of the structural plate outside the inlet flow channel mold groove (511) and the outlet flow channel mold groove (512), and the short side mounting holes (412) are arranged on the outer edge of the short side of the structural plate between the inlet flow channel mold groove (511) and the outlet flow channel mold groove (512); the long side mounting holes (411) on the insulating plate (6) are arranged on the outer edge of the long side of the insulating plate outside the inlet flow channel (611) and the outlet flow channel (612), and the short side mounting holes (412) are arranged on the outer edge of the short side of the insulating plate between the inlet flow channel (611) and the outlet flow channel (612).

10. A liquid flow battery, characterized in that: It comprises a positive battery stack (31), a negative battery stack (32) and a bipolar plate (33) arranged between the positive battery stack (31) and the negative battery stack (32), wherein both sides of the positive battery stack (31) and the negative battery stack (32) are packaged by an integrated battery stack end plate (4) and a screw fixing member (34).

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