Plate frame with two-sided runners and two-stack cell stack structure

Abstract

The utility model discloses a plate frame with a double-sided flow channel and a two-stack cell stack structure, the plate frame with the double-sided flow channel comprises a first through hole, a second through hole, a third through hole, a fourth through hole, a first turnover opening, a second turnover opening, a third turnover opening, a fourth turnover opening and an electrode cavity, the first through hole, the second through hole, the third through hole and the fourth through hole are formed in four corners of the plate frame; the first through hole is communicated with the first turnover opening; the first turnover opening is communicated with the electrode cavity; the electrode cavity is communicated with the second turnover opening; the second turnover opening is communicated with the third through hole; the second through hole is communicated with the third turnover opening; the third overturning opening is communicated with the electrode cavity; the electrode cavity is communicated with the fourth overturning opening; and the fourth turnover opening is communicated with the fourth through hole. According to the plate frame with the double-sided runners, the breadth of the plate frame is utilized to the maximum extent, and powerful support is provided for subsequent injection molding production.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and particularly relates to a plate frame with double-sided flow channels and a binary battery stack structure. Background Art

[0002] The environmental pressure caused by the massive consumption of fossil energy is becoming increasingly prominent. Renewable energy generation such as wind and solar energy is affected by factors such as time, day and night, and season, and has obvious discontinuous, unstable and uncontrollable non-steady-state characteristics. Therefore, large-scale and efficient energy storage technology is highly valued. Among them, flow batteries are recognized as the most promising energy storage technology due to their high safety, large energy storage scale, high efficiency and long life.

[0003] The battery stack is the reaction site of the flow battery. It is composed of multiple single cells stacked together. Most existing battery stacks are single battery stacks. Some are made into two sub-stacks, and then the sub-stacks are connected in series to form a battery stack. Two opposite end plate frames are set between the two sub-stacks connected in series. There are end plate frames, insulation plates and other components between the two existing battery stacks, which has the problem of high battery stack cost and many components. Utility Model Content

[0004] In view of the above problems, the utility model discloses a plate frame with double-sided flow channels, comprising: a first through hole, a second through hole, a third through hole, a fourth through hole, a first flip opening, a second flip opening, a third flip opening, a fourth flip opening and an electrode cavity;

[0005] The first through hole, the second through hole, the third through hole and the fourth through hole are arranged at the four corners of the plate frame;

[0006] The first through hole is connected to the first flip opening;

[0007] The first flipping port is connected to the electrode cavity;

[0008] The electrode cavity is communicated with the second flip port;

[0009] The second flip opening is connected to the third through hole;

[0010] The second through hole is connected to the third flip opening;

[0011] The third flipping port is connected to the electrode cavity;

[0012] The electrode cavity is communicated with the fourth flip port;

[0013] The fourth flip opening is communicated with the fourth through hole.

[0014] Furthermore, it also includes: a first flow channel;

[0015] The first flow channel is arranged on the front side of the plate frame;

[0016] One end of the first flow channel is communicated with the first through hole, and the other end is communicated with the first flip opening.

[0017] Furthermore, it also includes: a third flow channel;

[0018] The third flow channel is arranged on the front side of the plate frame;

[0019] One end of the third flow channel is communicated with the second flip opening, and the other end is communicated with the third through hole.

[0020] Furthermore, it also includes: a second flow channel and a fourth flow channel;

[0021] The second flow channel and the fourth flow channel are both arranged on the front side of the plate frame;

[0022] The second flow channel is communicated with the second through hole;

[0023] The fourth flow channel is communicated with the fourth through hole.

[0024] Furthermore, it also includes: a fifth flow channel;

[0025] The fifth flow channel is arranged on the back of the plate frame;

[0026] One end of the fifth flow channel is communicated with the second through hole, and the other end is communicated with the third flip opening.

[0027] Furthermore, it also includes: a seventh flow channel;

[0028] The seventh flow channel is arranged on the back of the plate frame;

[0029] One end of the seventh flow channel is communicated with the fourth flip port, and the other end is communicated with the fourth through hole.

[0030] Furthermore, it also includes: a sixth flow channel and an eighth flow channel;

[0031] The sixth flow channel and the eighth flow channel are both arranged on the back of the plate frame;

[0032] The sixth flow channel is connected to the first through hole;

[0033] The eighth flow channel is communicated with the third through hole.

[0034] Furthermore, the depths of the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, the sixth flow channel, the seventh flow channel and the eighth flow channel are 2-3 mm.

[0035] Furthermore, the depth of the electrode cavity is 4-6 mm.

[0036] The utility model also discloses a two-pile battery stack structure, comprising: the above-mentioned double-sided flow channel plate frame, a first partition plate frame and a second partition plate frame;

[0037] 2n of the plate frames and the first partition plate frame form a first sub-pile;

[0038] The second partition plate frame and 2n plate frames form a second sub-pile;

[0039] The 2n plate frames, the first partition plate frame, the second partition plate frame and the 2n plate frames are connected in sequence;

[0040] Among them, the front side of the even-numbered plate frame rotates 180° and abuts against the back side of the odd-numbered plate frame;

[0041] n is a natural number greater than or equal to 1.

[0042] Compared with the prior art, the beneficial effects of the utility model are: eliminating the end plate frame, insulation board and other components in the middle of the traditional battery stack, reducing the cost of the battery stack and improving reliability.

[0043] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 The front side of the panel frame according to the embodiment of the utility model is shown;

[0046] Figure 2 The back side of the board frame according to the embodiment of the utility model is shown;

[0047] Figure 3 A binary battery stack structure according to an embodiment of the present utility model is shown.

[0048] Figure numerals: 1. first through hole; 2. second through hole; 3. third through hole; 4. fourth through hole; 5. first flip opening; 6. second flip opening; 7. third flip opening; 8. fourth flip opening; 9. electrode cavity; 10. first flow channel; 11. second flow channel; 12. third flow channel; 13. fourth flow channel; 14. fifth flow channel; 15. sixth flow channel; 16. seventh flow channel; 17. eighth flow channel; 18. first partition plate frame; 19. second partition plate frame; 20. first sub-stack; 21. second sub-stack. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] Figure 1 FIG. 2 shows the front side of the panel frame according to an embodiment of the present utility model. Figure 1 As shown, a plate frame with a double-sided flow channel proposed in the utility model comprises: a first through hole 1, a second through hole 2, a third through hole 3, a fourth through hole 4, a first flip opening 5, a second flip opening 6, a third flip opening 7, a fourth flip opening 8 and an electrode cavity 9;

[0051] The first through hole 1, the second through hole 2, the third through hole 3 and the fourth through hole 4 are arranged at the four corners of the plate frame;

[0052] The electrode cavity 9 is arranged in the middle area of ​​the plate frame;

[0053] The first through hole 1 is connected to the first flip opening 5;

[0054] The first flipping port 5 is connected to the electrode cavity 9;

[0055] The electrode cavity 9 is connected to the second flipping port 6;

[0056] The second flip opening 6 is connected to the third through hole 3;

[0057] like Figure 2 As shown, the second through hole 2 is connected to the third flip opening 7;

[0058] The third flipping port 7 is connected to the electrode cavity 9;

[0059] The electrode cavity 9 is connected to the fourth flip port 8;

[0060] The fourth flip opening 8 is communicated with the fourth through hole 4 .

[0061] Exemplarily, the positive electrode / membrane / negative electrode / bipolar plate are arranged in sequence in the electrode cavity 9; the membrane separates the electrode cavity 9 into a front electrode cavity and a back electrode cavity, and separates the positive electrode electrolyte and the negative electrode electrolyte.

[0062] A first through hole 1, for electrolyte to flow in or out;

[0063] The second through hole 2 is used for electrolyte to flow in or out;

[0064] The third through hole 3 is used for electrolyte to flow in or out;

[0065] The fourth through hole 4 is used for the electrolyte to flow in or out;

[0066] The first flipping port 5 is used for the electrolyte to flow to the back of the plate frame;

[0067] The second flip opening 6 is used for the electrolyte to flow to the front side of the plate frame;

[0068] The third flip opening 7 is used for the electrolyte to flow to the front of the plate frame;

[0069] The fourth flip opening 8 is used for the electrolyte to flow to the back of the plate frame;

[0070] The electrode cavity 9 is used to provide a place for positive and negative electrode reactants.

[0071] The utility model discloses a plate frame with double-sided flow channels, which maximizes the use of the plate frame width and provides strong support for subsequent injection molding production.

[0072] In some embodiments, the plate frame of the double-sided flow channel further includes: a first flow channel 10;

[0073] The first flow channel 10 is arranged on the front side of the plate frame;

[0074] One end of the first flow channel 10 is communicated with the first through hole 1 , and the other end is communicated with the first flip opening 5 .

[0075] The first flow channel 10 is used for the electrolyte to flow through.

[0076] In some embodiments, the plate frame of the double-sided flow channel further includes: a third flow channel 12;

[0077] The third flow channel 12 is arranged on the front side of the plate frame;

[0078] One end of the third flow channel 12 is communicated with the second flip port 6 , and the other end is communicated with the third through hole 3 .

[0079] The third flow channel 12 is used for the electrolyte to flow through.

[0080] In some embodiments, the plate frame of the double-sided flow channel further includes: a second flow channel 11 and a fourth flow channel 13;

[0081] The second flow channel 11 and the fourth flow channel 13 are both arranged on the front side of the plate frame;

[0082] The second flow channel 11 is communicated with the second through hole 2;

[0083] The fourth flow channel 13 is communicated with the fourth through hole 4 .

[0084] The second flow channel 11 is used for the electrolyte to flow through.

[0085] The fourth flow channel 13 is used for the electrolyte to flow through.

[0086] In some embodiments, the plate frame of the double-sided flow channel further includes: a fifth flow channel 14;

[0087] The fifth flow channel 14 is arranged on the back of the plate frame;

[0088] One end of the fifth flow channel 14 is communicated with the second through hole 2 , and the other end is communicated with the third flip opening 7 .

[0089] The fifth flow channel 14 is used for the electrolyte to flow through.

[0090] In some embodiments, the plate frame of the double-sided flow channel further includes: a seventh flow channel 16;

[0091] The seventh flow channel 16 is arranged on the back of the plate frame;

[0092] One end of the seventh flow channel 16 is communicated with the fourth reversing port 8 , and the other end is communicated with the fourth through hole 4 .

[0093] The seventh flow channel 16 is used for the electrolyte to flow through.

[0094] In some embodiments, the plate frame of the double-sided flow channel further includes: a sixth flow channel 15 and an eighth flow channel 17;

[0095] The sixth flow channel 15 and the eighth flow channel 17 are both arranged on the back of the plate frame;

[0096] The sixth flow channel 15 is connected to the first through hole 1;

[0097] The eighth flow channel 17 is communicated with the third through hole 3 .

[0098] The sixth flow channel 15 is used for the electrolyte to flow through.

[0099] The eighth flow channel 17 is used for the electrolyte to flow through.

[0100] In some embodiments, the first flow channel 10, the second flow channel 11, the third flow channel 12, the fourth flow channel 13, the fifth flow channel 14, the sixth flow channel 15, the seventh flow channel 16 and the eighth flow channel 17 are groove-shaped with a depth of 2-3 mm. Preferably, the flow channel depth is set to 2.3 mm.

[0101] In some embodiments, the depth of the electrode cavity 9 is 4-6 mm, which can ensure subsequent injection molding production and reduce the difficulty of injection molding.

[0102] Figure 1 , Figure 2 , Figure 3 The size of the middle electrode cavity 9 is only an example. The size of the electrode cavity 9 can be designed according to actual conditions and will not be described in detail here.

[0103] In some embodiments, sealing rings are provided around the through hole, the flip opening, the electrode cavity 9 and the outer side of the flow channel to prevent leakage of the electrolyte.

[0104] like Figure 1 and Figure 2 As shown, the first flow channel 10 on the front of the plate frame is combined with the eighth flow channel 17 on the back of the previous plate frame to form a closed flow channel; the second flow channel 11 on the front of the plate frame is combined with the seventh flow channel 16 on the back of the previous plate frame to form a closed flow channel; the third flow channel 12 on the front of the plate frame is combined with the sixth flow channel 15 on the back of the previous plate frame to form a closed flow channel; the fourth flow channel 13 on the front of the plate frame is combined with the fifth flow channel 14 on the back of the previous plate frame to form a closed flow channel;

[0105] The fifth flow channel 14 on the back of the plate frame is combined with the fourth flow channel 13 on the front of the subsequent plate frame to form a closed flow channel; the sixth flow channel 15 on the back of the plate frame is combined with the third flow channel 12 on the front of the subsequent plate frame to form a closed flow channel; the seventh flow channel 16 on the back of the plate frame is combined with the second flow channel 11 on the front of the subsequent plate frame to form a closed flow channel; the eighth flow channel 17 on the back of the plate frame is combined with the first flow channel 10 on the front of the subsequent plate frame to form a closed flow channel.

[0106] like Figure 1 and Figure 2 As shown, assuming that the positive electrode electrolyte flows in from the first through hole 1 on the front of the plate frame, the electrolyte will flow through the first flow channel 10, then flow to the first flip port 5, and flow to the back of the plate frame through the first flip port 5. Flow to the middle electrode cavity 9 (back electrode cavity), and then flow back to the front of the plate frame through the second flip port 6. The electrolyte flows out through the second flip port 6, passes through the third flow channel 12, flows to the third through hole 3, and finally flows out from the third through hole 3.

[0107] Assuming that the negative electrode electrolyte flows in from the second through hole 2 on the back of the plate frame, the electrolyte will flow through the fifth flow channel 14 and then flow to the third flip port 7, and then flow to the front of the plate frame through the third flip port 7. The electrolyte flows to the middle electrode cavity 9 (front electrode cavity), and then flows back to the back of the plate frame through the fourth flip port 8. The electrolyte flows out through the fourth flip port 8, passes through the seventh flow channel 16, flows to the fourth through hole 4, and finally flows out from the fourth through hole 4.

[0108] The above describes the basic flow form of the positive / negative electrolyte on the plate frame, but it will be found that the second through hole 2, the second flow channel 11, the fourth through hole 4 and the fourth flow channel 13 on the front of the plate frame and the first through hole 1, the sixth flow channel 15, the eighth flow channel 17 and the third through hole 3 on the back are not mentioned. This is because the basic structure of the traditional plate frame ends like this, and this is different from the traditional method. In order to make full use of the width of the plate frame and reduce the thickness of the plate frame, the original 4.6mm deep flow channel is changed to 2.3mm, and at the same time, a 2.3mm flow channel is added at the complementary position of the adjacent plate frame flow channels. Therefore, the flow channel of this solution is different from the traditional method on a plate frame, but each adjacent two plates together form a flow channel of a battery. The advantage of doing this is that the overall thickness of the plate frame can be reduced, and the width of the plate frame can be maximized (reducing the thickness of the plate frame can make the injection molding process easier / maximizing the width of the plate frame can make the plate frame less prone to warping, and the thickness of each area is more uniform).

[0109] Figure 3 The figure shows a binary battery stack structure according to an embodiment of the present utility model. Figure 3 As shown, the utility model also discloses a two-pile battery stack structure, comprising: the above-mentioned double-sided flow channel plate frame, a first partition plate frame 18 and a second partition plate frame 19;

[0110] The 2n plate frames and the first partition plate frame 18 form a first sub-pile 20;

[0111] The second partition plate frame 19 and the 2n plate frames form a second sub-pile 21;

[0112] The 2n plate frames, the first partition plate frame 18, the second partition plate frame 19 and the 2n plate frames are connected in sequence;

[0113] The front side of the even-numbered plate frame is rotated 180° based on the plane where it is located and abuts against the back side of the odd-numbered plate frame;

[0114] n is a natural number greater than or equal to 1.

[0115] Exemplarily, the back side of the first partition plate frame 18 abuts against the front side of the second partition plate frame 19 (rotated 180°), and the first through hole 1 of the first partition plate frame 18 corresponds to the third through hole 3 of the second partition plate frame 19; the third through hole 3 of the first partition plate frame 18 corresponds to the first through hole 1 of the second partition plate frame 19; the second through hole 2 of the first partition plate frame 18 corresponds to the fourth through hole 4 of the second partition plate frame 19; the fourth through hole 4 of the first partition plate frame 18 corresponds to the second through hole 2 of the second partition plate frame 19. The normal stacking of the plates is the same as the stacking of the first partition plate frame 18 and the second partition plate frame 19, which will not be repeated here. The two plates are taken as a group, and when installing the battery stack, multiple groups of plates can be set according to actual conditions.

[0116] The first partition frame 18 is used to divide the electrolyte circuit into two sub-stacks, and at the same time serves as a single battery;

[0117] The second partition plate frame 19 is used to divide the electrolyte circuit into two sub-stacks, and at the same time serves as a single battery.

[0118] The two-pile battery stack structure of the utility model divides the electrolyte flow into two independent battery stacks by applying a partition frame, but the current is an integral battery stack. Compared with the traditional two-pile structure, this method eliminates the middle end plate frame / insulation plate and other components, which reduces the cost and can also reduce the volume of the overall battery stack, indirectly reducing the footprint of the entire battery system.

[0119] like Figure 3 As shown, the negative electrode electrolyte can enter each single battery through the shared channel. When it flows to the first partition frame 18, the second through hole 2 of the first partition frame 18 is blocked, so the electrolyte can no longer flow backward. Therefore, after passing through the first partition frame 18, the electrolyte flows out from the shared channel at the lower end outlet.

[0120] The positive electrode electrolyte flows through the shared channel to each single cell, flows through the first partition frame 18 to the second partition frame 19. Since the third through hole 3 of the second partition frame 19 is blocked, the electrolyte can no longer flow backward. After passing through the second partition frame 19, the electrolyte flows out from the lower end shared channel outlet.

[0121] In this way, the electrolyte forms a stack, while the current flows through the middle electrode unaffected.

[0122] Similarly, the positive and negative electrolytes on the other side of the second partition frame 19 also flow, dividing the electrolyte of the entire battery stack into four parts, each forming two sub-stacks. The middle part is the electrode, which does not affect the flow of current.

[0123] The traditional design idea of ​​two-pile stack is that the liquid circuit and the circuit are separate, which is equivalent to connecting the two stacks together with wires. The two stacks have separate liquid circuits (with a partition in the middle), and the circuits are connected with wires. Stack 1 has two cavities for positive and negative electrodes, and stack 2 also has two cavities for positive and negative electrodes. The liquid supply system will be evenly divided outside the battery stack.

[0124] The utility model designs the first partition frame 18 and the second partition frame 19, the purpose of which is that the two sub-stack liquid paths or the two sub-stacks do not affect each other, and the circuits are no longer connected by wires. The partition frame is also a battery, eliminating the frame for partition.

[0125] The difference between the first partition plate frame 18 and the second partition plate frame 19 is that the first partition plate frame 18 blocks the second through hole 2 and the fourth through hole 4 of the shared channel, while the second partition plate frame 19 blocks the first through hole 1 and the third through hole 3 of the shared channel. Compared with the normal plate frame, the first partition plate frame 18 and the second partition plate frame 19 only block different positions of the shared channel respectively.

[0126] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plate frame with double-sided flow channels, characterized in that: include: A first through hole (1), a second through hole (2), a third through hole (3), a fourth through hole (4), a first flip opening (5), a second flip opening (6), a third flip opening (7), a fourth flip opening (8) and an electrode cavity (9); The first through hole (1), the second through hole (2), the third through hole (3) and the fourth through hole (4) are arranged at the four corners of the plate frame; The first through hole (1) is in communication with the first flip opening (5); The first flipping port (5) is in communication with the electrode cavity (9); The electrode cavity (9) is in communication with the second flipping port (6); The second flip opening (6) is in communication with the third through hole (3); The second through hole (2) is in communication with the third flip opening (7); The third flipping port (7) is in communication with the electrode cavity (9); The electrode cavity (9) is in communication with the fourth flip port (8); The fourth flip opening (8) is in communication with the fourth through hole (4).

2. The plate frame with double-sided flow channels according to claim 1, characterized in that: It also includes: a first flow channel (10); The first flow channel (10) is arranged on the front side of the plate frame; One end of the first flow channel (10) is in communication with the first through hole (1), and the other end is in communication with the first flip opening (5).

3. The plate frame with double-sided flow channels according to claim 2, characterized in that: Also includes: a third flow channel (12); The third flow channel (12) is arranged on the front side of the plate frame; One end of the third flow channel (12) is in communication with the second flip opening (6), and the other end is in communication with the third through hole (3).

4. The plate frame with double-sided flow channels according to claim 3, characterized in that: Also includes: A second flow channel (11) and a fourth flow channel (13); The second flow channel (11) and the fourth flow channel (13) are both arranged on the front side of the plate frame; The second flow channel (11) is in communication with the second through hole (2); The fourth flow channel (13) is in communication with the fourth through hole (4).

5. The plate frame with double-sided flow channels according to claim 4, characterized in that: Also includes: a fifth flow channel (14); The fifth flow channel (14) is arranged on the back side of the plate frame; One end of the fifth flow channel (14) is in communication with the second through hole (2), and the other end is in communication with the third flip opening (7).

6. The plate frame with double-sided flow channels according to claim 5, characterized in that: Also included: a seventh flow channel (16); The seventh flow channel (16) is arranged on the back side of the plate frame; One end of the seventh flow channel (16) is in communication with the fourth reversal port (8), and the other end is in communication with the fourth through hole (4).

7. The plate frame with double-sided flow channels according to claim 6, characterized in that: Also includes: a sixth flow channel (15) and an eighth flow channel (17); The sixth flow channel (15) and the eighth flow channel (17) are both arranged on the back side of the plate frame; The sixth flow channel (15) is in communication with the first through hole (1); The eighth flow channel (17) is in communication with the third through hole (3).

8. The plate frame with double-sided flow channels according to claim 7, characterized in that: The depths of the first flow channel (10), the second flow channel (11), the third flow channel (12), the fourth flow channel (13), the fifth flow channel (14), the sixth flow channel (15), the seventh flow channel (16) and the eighth flow channel (17) are 2-3 mm.

9. The plate frame with double-sided flow channels according to claim 1 or 8, characterized in that: The depth of the electrode cavity (9) is 4-6 mm.

10. A binary battery stack structure, characterized in that: include: The plate frame of the double-sided flow channel, the first partition plate frame (18) and the second partition plate frame (19) according to any one of claims 1 to 9; 2n of the plate frames and the first partition plate frame (18) form a first sub-pile (20); The second partition plate frame (19) and 2n plate frames form a second sub-pile (21); The 2n plate frames, the first partition plate frame (18), the second partition plate frame (19) and the 2n plate frames are connected in sequence; The front side of the even-numbered plate frame is rotated 180° and then abuts against the back side of the odd-numbered plate frame; and n is a natural number greater than or equal to 1.

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