CN219040521U - Battery module of flow battery - Google Patents

Abstract

The utility model provides a battery module of a flow battery, and relates to the field of flow batteries. The battery module of this flow battery includes: a first flow channel end plate; a second flow end plate disposed opposite the first flow end plate; and a cell stack disposed between the first flow channel end plate and the second flow channel end plate; the cell stack includes: at least three hermetically assembled battery stacks. According to the scheme, the length of the electrode can be adjusted at will under the condition of the same output power and the same electrode area, so that the length of the electrolyte flowing through the electrode is narrower, the conversion efficiency of electric energy is improved, and the tightness of the flow channel is met.

Description

Battery module of flow battery

Technical Field

The utility model relates to the field of flow batteries, in particular to a battery module of a flow battery.

Background

The performance of the flow battery stack, which is a core component of the flow battery energy storage system, determines the cost performance of the whole energy storage system;

the current flow battery is better in improving the electric energy conversion efficiency, the length of an electrolyte flowing through an electrode is often required to be shortened, the same electrode area is required on the premise of meeting the same power, the length of the electrode is required to be longer, and the sealing of the flow channel of the electrode is challenged under the condition that the length of the electrode is longer. The current flow battery cannot meet the actual power requirement and the corresponding flow channel sealing requirement.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a battery module of a flow battery, which can improve the conversion efficiency of electric energy.

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

the embodiment of the utility model provides a battery module of a flow battery, which comprises the following components:

a first flow channel end plate; a second flow end plate disposed opposite the first flow end plate; and a cell stack disposed between the first and second flow path end plates;

wherein, the single cell stack includes: at least three hermetically assembled battery stacks.

Optionally, a first arcuate flow channel and a second arcuate flow channel are provided in the first flow channel end plate;

a third arcuate flow passage and a fourth arcuate flow passage are provided in the second flow passage end plate;

flow passage holes are formed in the first arched flow passage, the second arched flow passage, the third arched flow passage and the fourth arched flow passage;

the runner holes are communicated with the at least three battery stacks which are assembled in a sealing way;

the electrolyte in the first arched flow channel flows into at least three cell stacks assembled in a sealing mode through flow channel holes in the first arched flow channel, and flows back into a second arched flow channel through the at least three cell stacks assembled in the sealing mode;

the electrolyte in the third arched flow channel flows into at least three cell stacks assembled in a sealing mode through flow channel holes in the third arched flow channel, and flows back into a fourth arched flow channel through the at least three cell stacks assembled in the sealing mode.

Optionally, the flow passage holes of the first arched flow passage, the flow passage holes of the second arched flow passage, the flow passage holes of the third arched flow passage and the flow passage holes of the fourth arched flow passage are all arranged in the end flow passages of the flow passages to which the flow passages belong.

Optionally, the end flow channels of the first arched flow channel and the end flow channels of the second arched flow channel are arranged on the upper side and the lower side of the first flow channel end plate;

the third arched flow channel and the first arched flow channel are correspondingly arranged, and the flow channel of the third arched flow channel and the flow channel hole of the first arched flow channel are arranged in a crossing way;

the fourth arched flow channel and the second arched flow channel are correspondingly arranged, and the flow channel holes of the fourth arched flow channel and the flow channel holes of the second arched flow channel are arranged in a crossing manner.

Optionally, the inlet end of the first arched flow channel and the inlet end of the third arched flow channel are communicated with an external liquid inlet pipe;

the outlet end of the second arched flow channel and the outlet end of the fourth arched flow channel are communicated with an external liquid outlet pipe;

the tail ends of the first arched flow channel, the second arched flow channel, the third arched flow channel and the fourth arched flow channel are all in a closed state.

Optionally, the at least three seal-assembled battery packs include:

a first stack;

a second stack sealingly assembled with the first stack;

at least one third stack disposed between the first stack and the second stack, the first stack, the second stack, and the at least one third stack being sealingly assembled;

the first stack is disposed adjacent to and sealingly assembled with the first flow channel end plate;

the second stack is disposed adjacent to and sealingly assembled with the second flow field end plate.

Optionally, the first stack includes: the first bipolar plate, the first electrode, the first outer frame, the first diaphragm, the second electrode, the second outer frame, the first inner frame and the second inner frame;

wherein the first outer frame is sleeved on the first electrode;

a first mounting platform is arranged on the first end face of the first outer frame, and the first bipolar plate is fixed on the first mounting platform;

the first inner frame is sleeved on the first electrode, the second end face of the first inner frame is assembled and connected with the second end face of the first outer frame, and a plurality of first circulation cavities communicated with the first electrode are formed after the first outer frame is assembled with the first inner frame;

the first diaphragm is arranged between the first electrode and the second electrode and is respectively connected with the first electrode, the second electrode, the first end face of the first inner frame and the first end face of the second outer frame;

the second inner frame and the second outer frame are sleeved on the second electrode;

the second end face of the second inner frame is assembled and connected with the second end face of the second outer frame, and a plurality of second flow through cavities communicated with the second electrode are formed after the second outer frame and the second inner frame are assembled;

the first end face of the first outer frame is fixedly connected with the first flow channel end plate, the second end face of the first outer frame is fixedly connected with the first end face of the second outer frame, and the first end face of the second outer frame is fixedly connected with the third stack.

Optionally, the first stack further comprises:

and a first current collector in contact with the first bipolar plate.

Optionally, the second stack includes:

a second bipolar plate;

a third outer frame sleeved on the second bipolar plate;

a second current collector in contact with the second bipolar plate;

the second end face of the third outer frame is fixedly connected with the second flow channel end plate, and the first end face of the third outer frame is fixedly connected with the third stack.

Optionally, the third stack comprises: a fourth bipolar plate, a fifth electrode, a fifth outer frame, a third separator, a sixth electrode, a sixth outer frame, a fifth inner frame, and a sixth inner frame;

wherein the fifth outer frame is sleeved on the fifth electrode;

a third mounting platform is arranged on the first end face of the fifth outer frame, and the fourth bipolar plate is fixed on the third mounting platform;

the fifth inner frame is sleeved on the fifth electrode, the second end face of the fifth inner frame is assembled and connected with the second end face of the fifth outer frame, and a plurality of fourth circulation cavities communicated with the fifth electrode are formed after the fifth outer frame is assembled with the fifth inner frame;

the third diaphragm is arranged between the fifth electrode and the sixth electrode and is respectively connected with the first end surfaces of the fifth electrode, the sixth electrode and the fifth inner frame and the first end surface of the sixth outer frame;

the sixth inner frame and the sixth outer frame are sleeved on the sixth electrode;

the second end face of the sixth inner frame is assembled and connected with the second end face of the sixth outer frame, and a plurality of fifth circulation cavities communicated with the sixth electrode are formed after the sixth outer frame and the sixth inner frame are assembled;

the second end face of the fifth outer frame is fixedly connected with the first end face of the sixth outer frame;

the first end face of the fifth outer frame is fixedly connected with the second end face of the second outer frame, and the second end face of the sixth outer frame is fixedly connected with the first end face of the third outer frame.

The scheme of the utility model at least comprises the following beneficial effects:

the battery module of the flow battery comprises: a first flow channel end plate; a second flow end plate disposed opposite the first flow end plate; and a cell stack disposed between the first and second flow path end plates; wherein, the single cell stack includes: at least three hermetically assembled battery stacks. According to the battery module of the flow battery, the length of the electrode in the flow battery can be increased along with the increase of the number of the flow passage holes, so that the length of the electrode can be adjusted randomly under the conditions of equal output power and equal electrode area, the length of the electrolyte flowing through the electrode is narrower, the conversion efficiency of electric energy is improved, and the tightness of the flow passage is met.

Drawings

Fig. 1 is a perspective view of a battery module of a flow battery of the present utility model;

fig. 2 is an exploded perspective view of a single battery module of the flow battery of the present utility model;

fig. 3 is a perspective view of a first flow channel end plate of a battery module of the flow battery of the present utility model;

fig. 4 is a sectional view of a first flow channel end plate of a battery module of a flow battery of the present utility model;

fig. 5 is a cross-sectional view of a second flow end plate of a battery module of a flow battery of the present utility model;

fig. 6 is a schematic structural view of a first stack of individual battery modules of the flow battery of the present utility model;

fig. 7 is a schematic structural view of a second stack of individual battery modules of the flow battery of the present utility model;

fig. 8 is a schematic structural view of a third stack of individual battery modules of the flow battery of the present utility model.

Reference numerals illustrate:

21. a first flow channel end plate; 22. a second flow channel end plate; 24. a first arcuate flow passage; 25. a second arcuate flow path; 26. a third arcuate flow path; 27. a fourth arcuate flow path; 241. an end runner of the first arcuate runner; 242. an inlet end of the first arcuate flow passage; 251. the end runner of the second arched runner; 252. an outlet end of the second arcuate flow passage 25; 261. a first flow passage hole; 262. a second flow passage hole; 263. a third flow passage hole; 264. a fourth flow passage hole; 265. an inlet end of the third arcuate flow passage; 271. an outlet end of the fourth arcuate flow passage 27;

3. a cell stack; 31. a first stack; 32. a second stack; 33. a third stack; 310. a first bipolar plate; 311. a first electrode; 312. a first outer frame; 314. a first diaphragm; 315. a second electrode; 316. a second outer frame; 317. a first current collector; 318. a first inner frame; 319. a second inner frame; 320. a second bipolar plate; 322. a third outer frame; 327. a second current collector; 330. a fourth bipolar plate; 331. a fifth electrode; 332. a fifth outer frame; 334. a third diaphragm; 335. a sixth electrode; 336. a sixth outer frame; 338. a fifth inner frame; 339. a sixth inner frame; 61. the first limiting stand column; 62. a first limiting hole; 63. the second limiting stand column; 91. a first gasket; 92. and a second gasket.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1 to 5, an embodiment of the present utility model provides a battery module of a flow battery, including: a first flow channel end plate 21; a second flow path end plate 22 disposed opposite the first flow path end plate 21; and a cell stack 3 disposed between the first flow path end plate 21 and the second flow path end plate 22; wherein, the single cell stack 3 includes: at least three hermetically assembled battery stacks;

a first arcuate flow passage 24 and a second arcuate flow passage 25 are provided in the first flow passage end plate 21;

a third arcuate flow passage 26 and a fourth arcuate flow passage 27 are provided in the second flow passage end plate 22;

flow passage holes are formed in the first arched flow passage 24, the second arched flow passage 25, the third arched flow passage 26 and the fourth arched flow passage 27; the runner holes are communicated with at least three battery stacks assembled in a sealing way;

the electrolyte in the first arcuate flow channel 24 flows into the at least three sealed assembled cell stacks through the flow channel holes in the first arcuate flow channel 24 and flows back into the second arcuate flow channel 25 through the at least three sealed assembled cell stacks;

the electrolyte in the third arcuate flow path 26 flows into the at least three sealed assembled stacks through the flow path holes in the third arcuate flow path 26 and flows back into the fourth arcuate flow path 27 through the at least three sealed assembled stacks.

According to the embodiment, through the arrangement of the flow passage holes, the length of the electrode in the flow battery can be increased along with the increase of the number of the flow passage holes, so that the length of the electrode can be adjusted randomly under the conditions of equal output power and equal electrode area, the length of the electrolyte flowing through the electrode is narrower, the conversion efficiency of electric energy is improved, and the tightness of the flow passage is met.

As shown in fig. 3 to 4, in an alternative embodiment of the present utility model, the flow passage holes include a first flow passage hole 261, a second flow passage hole 262, a third flow passage hole 263, and a fourth flow passage hole 264, the first flow passage hole 261 is provided in the first arcuate flow passage 24, the second flow passage hole 262 is provided in the second arcuate flow passage 25, the third flow passage hole 263 is provided in the third arcuate flow passage 24, and the fourth flow passage hole 264 is provided in the fourth arcuate flow passage 27; when the first arcuate flow channel 24 of the first flow channel end plate 21 is filled with the positive electrolyte, the third arcuate flow channel 26 of the second flow channel end plate 22 is filled with the negative electrolyte, whereas when the first arcuate flow channel 24 of the first flow channel end plate 21 is filled with the negative electrolyte, the third arcuate flow channel 26 of the second flow channel end plate 22 is filled with the negative electrolyte.

In this embodiment, after the positive electrolyte is introduced into the first arcuate flow channel 24 of the first flow channel end plate 21, the positive electrolyte flows into the at least three assembled battery stacks through the first flow channel holes 261 and flows back into the second arcuate flow channel 25 through the second flow channel holes 262; after the third arcuate flow channels 26 of the second flow channel end plate 22 are filled with catholyte, the catholyte flows into the at least three sealed cell stacks through third flow channel holes 263 and flows back into the fourth arcuate flow channels 27 through fourth flow channel holes 264.

In an alternative embodiment of the present utility model, the flow holes of the first arcuate flow channel 24 and the flow holes of the second arcuate flow channel 25 are both disposed in the end flow channels of the respective flow channels; the end flow channels 241 of the first arcuate flow channel 24 and the end flow channels 251 of the second arcuate flow channel 25 are provided on both upper and lower sides of the first flow channel end plate 21;

the third arched flow passage 26 and the first arched flow passage 24 are correspondingly arranged, and the flow passage of the third arched flow passage 26 and the flow passage hole of the first arched flow passage 24 are arranged in a crossing manner;

the fourth arched flow channel 27 and the second arched flow channel 25 are correspondingly arranged, and the flow channel holes of the fourth arched flow channel 27 and the flow channel holes of the second arched flow channel 25 are arranged in a crossing manner;

the inlet end 242 of the first arcuate flow passage 24 and the inlet end 265 of the third arcuate flow passage 26 are in communication with an external liquid inlet tube;

the outlet end 252 of the second arcuate flow passage 25 and the outlet end 271 of the fourth arcuate flow passage 27 are in communication with an external liquid outlet pipe;

the ends of the first arcuate flow passage 24, the second arcuate flow passage 25, the third arcuate flow passage 26 and the fourth arcuate flow passage 27 are all closed.

In this embodiment, the first flow channel end plate 21 and the second flow channel end plate 22 have the same structure, and when in use, after the first flow channel end plate 21 is fixed, the second flow channel end plate 22 needs to be rotated 180 degrees and then is arranged opposite to the first flow channel end plate 21; after the first end plate 11 and the second end plate 12 are oppositely arranged, the first flow channel end plate 21 is fixedly connected with the first end plate 11 through a first positioning pin, and the second flow channel end plate 22 is fixedly connected with the second flow channel end plate 22 through a second positioning pin.

In this embodiment, the flow passage holes are formed at the upper and lower sides of the flow passage end plates so that electrolyte can flow from one side to the other side after entering the at least three sealed assembled cell stacks; the intersecting arrangement of the flow passage holes means that after the second flow passage end plate 22 is rotated 180 degrees to be arranged opposite to the first flow passage end plate 21, the projections of the first flow passage hole 261 and the third flow passage hole 263 do not overlap in the case that the first arcuate flow passage 24 and the third arcuate flow passage 26 are vertically opposite, and the projections of the second flow passage hole 262 and the fourth flow passage hole 264 do not overlap in the case that the second arcuate flow passage 25 and the fourth arcuate flow passage 27 are vertically opposite.

In an alternative embodiment of the present utility model, as shown in fig. 2, at least three seal-assembled battery packs include: a first stack 31; a second stack 32 sealingly assembled with the first stack 31; at least one third stack 33 disposed between the first stack 31 and the second stack 32, the first stack 31, the second stack 32, and the at least one third stack 33 being sealingly assembled;

the first stack 31 is disposed adjacent the first flow channel end plate 21 and sealingly assembled with the first flow channel end plate 21;

the second stack 32 is disposed adjacent the second flow field plate 22 and sealingly engages the second flow field plate 22.

In this embodiment, the first stack 31 is fixedly connected to the first flow channel end plate 21, the second stack 32 is fixedly connected to the second flow channel end plate 22, and the number of the third stacks 33 can be stacked according to the requirement.

As shown in fig. 6, in an alternative embodiment of the present utility model, the first stack 31 includes: a first bipolar plate 310, a first electrode 311, a first outer frame 312, a first separator 314, a second electrode 315, a second outer frame 316, a first inner frame 318, and a second inner frame 319;

wherein, the first outer frame 312 is sleeved on the first electrode 311; a first end surface of the first outer frame 312 is provided with a first mounting platform, and the first bipolar plate 310 is fixed on the first mounting platform;

the first inner frame 318 is sleeved on the first electrode 311, the second end surface of the first inner frame 318 is assembled and connected with the second end surface of the first outer frame 312, and a plurality of first flow through cavities communicated with the first electrode 311 are formed after the first outer frame 312 is assembled with the first inner frame 318;

the first separator 314 is disposed between the first electrode 311 and the second electrode 315, and is connected to the first electrode 311, the second electrode 315, the first end surface of the first inner frame 318, and the first end surface of the second outer frame 316, respectively;

the second inner frame 319 and the second outer frame 316 are both sleeved on the second electrode 315;

a second end surface of the second inner frame 319 is assembled with a second end surface of the second outer frame 316, and a plurality of second flow through cavities which are communicated with the second electrode 315 are formed after the second outer frame 316 and the second inner frame 319 are assembled;

the first end surface of the first outer frame 312 is fixedly connected with the first flow channel end plate 21, the second end surface of the first outer frame 312 is fixedly connected with the first end surface of the second outer frame 316, and the first end surface of the second outer frame 316 is fixedly connected with the third stack 33.

In this embodiment, the first bipolar plate 310 and the first mounting platform may be fixedly connected by laser welding, hot-melt film thermocompression bonding, glue bonding, etc., and the first electrode 311 and the second electrode 315 have opposite electrical properties, i.e. the first electrode 311 is a regular second electrode 315 is negative; the first diaphragm 314 and the first end face of the first inner frame 318 and the first end face of the second outer frame 316 may be fixedly connected by laser welding, hot melt film thermocompression bonding, glue bonding, etc., so as to be fixed between the first electrode 311 and the second electrode 315, where the first diaphragm 314 is used to isolate the electrolyte flowing into the first electrode 311 and the second electrode 315, so that the electrolyte flowing into the first electrode 311 through the first flow cavity does not flow into the second electrode 315 under the isolation action of the first diaphragm 314;

the design of the first circulation cavity makes the electrolyte flowing into the second end face of the first inner frame 318 and the first outer frame 312 only enter the first electrode 311 through the first circulation cavity after the sealing assembly, and similarly the electrolyte flowing into the second end face of the second outer frame 316 only flows into the second electrode 315 through the second circulation cavity.

In an alternative embodiment of the present utility model, as shown in fig. 6, the first stack 31 further includes:

a first current collector 317 in contact with the first bipolar plate 310.

In this embodiment, the first current collector 317 is a metal foil, such as copper, for collecting current, the length of the first current collector 317 is required to be longer than that of the first frame 312, one end of the first current collector 317 extends out from one end of the first frame 312, and the extending portion is used for connecting to an external power source.

In this embodiment, the first end surface of the first outer frame 312 may be provided with a first limiting post 61, and then the first flow channel end plate 21 is provided with a corresponding first limiting hole 62, and the first outer frame 312 and the first flow channel end plate 21 are fixedly connected through the first limiting post 61 and the first limiting hole 62.

As shown in fig. 7, in an alternative embodiment of the present utility model, the second stack 32 includes: a second bipolar plate 320; a third outer frame 322 sleeved on the second bipolar plate 320; and a second current collector 327 in contact with the second bipolar plate 320.

The second end surface of the third outer frame 322 is fixedly connected to the second flow channel end plate 22, and the first end surface of the third outer frame 322 is fixedly connected to the third stack 33.

In this embodiment, the second current collector 327 is a metal foil, and is used for collecting current, and the second current collector 327 is located between the second end surface of the third outer frame 322 and the second flow channel end plate 22; the length of the second current collector 327 is longer than that of the third outer frame 322, and one end of the second current collector 327 extends out from one end of the third outer frame 322, and the extending-out portion is used for connecting an external power supply.

In this embodiment, the second end surface of the third outer frame 322 may be provided with a second limiting post 63, and then the second flow channel end plate 22 is provided with a corresponding second limiting hole, and the third outer frame 322 and the second flow channel end plate 22 are fixedly connected through the second limiting post 63 and the second limiting hole.

In an alternative embodiment of the present utility model, as shown in fig. 8, the third stack 33 includes: a fourth bipolar plate 330, a fifth electrode 331, a fifth outer frame 332, a third separator 334, a sixth electrode 335, a sixth outer frame 336, a fifth inner frame 338, and a sixth inner frame 339;

wherein the fifth outer frame 332 is sleeved on the fifth electrode 331; a third mounting platform is disposed on the first end surface of the fifth outer frame 332, and the fourth bipolar plate 330 is fixed on the third mounting platform;

the fifth inner frame 338 is sleeved on the fifth electrode 331, a second end surface of the fifth inner frame 338 is assembled and connected with a second end surface of the fifth outer frame 332, and a plurality of fourth circulation cavities communicated with the fifth electrode 331 are formed after the fifth outer frame 332 and the fifth inner frame 338 are assembled;

the third separator 334 is disposed between the fifth electrode 331 and the sixth electrode 335, and is connected to the first end surfaces of the fifth electrode 331, the sixth electrode 335, the fifth inner frame 338, and the first end surface of the sixth outer frame 336, respectively;

the sixth inner frame 339 and the sixth outer frame 336 are both sleeved on the sixth electrode 335; the second end surface of the sixth inner frame 339 is assembled and connected with the second end surface of the sixth outer frame 336, and a plurality of fifth flow chambers communicating with the sixth electrodes 335 are formed after the sixth outer frame 336 and the sixth inner frame 339 are assembled.

In this embodiment, the third stack 33 may be a single or a plurality of third stacks 33, and when stacking the plurality of third stacks 33, the first end face of the fifth outer frame 332 on the new third stack 33 and the second end face of the sixth outer frame 336 on the old third stack 33 may be assembled.

In this embodiment, when the battery module of the flow battery is assembled as a whole, the first end face of the sixth inner frame 339 and the second bipolar plate may be fixedly connected by laser welding, hot-melt film thermocompression bonding, adhesive bonding, or the like; the fourth bipolar plate 330 and the third mounting platform can be fixedly connected by means of laser welding, hot-melt film hot-press bonding, glue bonding and the like, the fifth electrode 331 and the sixth electrode 335 are opposite in electrical property, and the fifth electrode 331 and the first electrode 311 are identical in electrical property; the third diaphragm 334 is fixedly connected with the first end surface of the fifth inner frame 338 and the first end surface of the sixth outer frame 336 by means of laser welding, hot-melt film thermocompression bonding, glue bonding, etc., so as to be fixed between the fifth electrode 331 and the sixth electrode 335, the third diaphragm 334 is used for isolating the electrolyte flowing into the fifth electrode 331 and the sixth electrode 335, so that the electrolyte flowing into the fifth electrode 331 through the fourth circulation cavity does not flow into the sixth electrode 335 under the isolation action of the third diaphragm 314;

the fourth flow chamber is designed such that after the fifth inner frame 338 and the fifth outer frame 332 are assembled in a sealed manner, the electrolyte flowing into the second end surface of the fifth outer frame 332 can only enter the first electrode 331 through the fourth flow chamber, and similarly, the electrolyte flowing into the sixth electrode 335 through the fifth flow chamber can only flow into the second end surface of the sixth outer frame 336.

After the first end surface of the fifth outer frame 332 is fixedly connected with the second end surface of the second outer frame 316, the electrolyte flowing into the second end surface of the second outer frame 316 can flow into the second electrode 315 through a plurality of second flow cavities at the same time, so that each portion of the second electrode 315 can be soaked by the electrolyte in the shortest time;

similarly, after the second end surface of the sixth outer frame 336 is fixedly connected with the first end surface of the third outer frame 322, the electrolyte flowing into the second end surface of the sixth outer frame 336 may flow into the sixth electrode 335 through the plurality of fifth flow chambers at the same time, so that each portion of the sixth electrode 335 may be soaked by the electrolyte in the shortest time.

According to the battery module of the flow battery, through the design of the arched flow channels, under the condition that the length of the electrode is too long, the speed of electrolyte entering the electrode can be increased by increasing the number of flow channel holes, so that the flow resistance of the electrolyte flowing through the electrode can be reduced by increasing the length of the electrode and shortening the width of the electrode on the premise of meeting the same power and the same electrode area, and the pump consumption is reduced, and the conversion efficiency of electric energy is improved.

The foregoing is a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model and are intended to be comprehended within the scope of the present utility model.

Claims (9)

1. A battery module for a flow battery, comprising:

a first flow channel end plate (21); a second flow path end plate (22) disposed opposite the first flow path end plate (21); and a cell stack (3) disposed between the first flow channel end plate (21) and the second flow channel end plate (22);

wherein the cell stack (3) comprises: at least three hermetically assembled battery stacks;

a first arched flow passage (24) and a second arched flow passage (25) are arranged in the first flow passage end plate (21);

a third arched flow passage (26) and a fourth arched flow passage (27) are arranged in the second flow passage end plate (22);

flow passage holes are formed in the first arched flow passage (24), the second arched flow passage (25), the third arched flow passage (26) and the fourth arched flow passage (27);

the runner holes are communicated with the at least three battery stacks which are assembled in a sealing way;

the electrolyte in the first arched flow channel (24) flows into at least three cell stacks assembled in a sealing way through flow channel holes in the first arched flow channel (24) and flows back into the second arched flow channel (25) through the at least three cell stacks assembled in a sealing way;

electrolyte in the third arched flow channel (26) flows into at least three cell stacks assembled in a sealing mode through flow channel holes in the third arched flow channel (26), and flows back into a fourth arched flow channel (27) through the at least three cell stacks assembled in the sealing mode.

2. The flow battery cell module of claim 1, wherein the flow battery cell module comprises a plurality of battery cells,

the runner holes of the first arched runner (24), the runner holes of the second arched runner (25), the runner holes of the third arched runner (26) and the runner holes of the fourth arched runner (27) are all arranged in the tail end runners of the runners to which the first arched runner belongs.

3. The flow battery cell module of claim 2, wherein the flow battery cell module comprises a plurality of battery cells,

the tail end flow channels (241) of the first arched flow channels (24) and the tail end flow channels (251) of the second arched flow channels (25) are arranged on the upper side and the lower side of the first flow channel end plate (21);

the third arched flow channel (26) and the first arched flow channel (24) are correspondingly arranged, and the flow channel of the third arched flow channel (26) and the flow channel hole of the first arched flow channel (24) are arranged in a crossing way;

the fourth arched flow channel (27) and the second arched flow channel (25) are correspondingly arranged, and the flow channel holes of the fourth arched flow channel (27) and the flow channel holes of the second arched flow channel (25) are arranged in a crossing way.

4. The battery module of the flow battery according to claim 3,

the inlet end (242) of the first arcuate flow passage (24) and the inlet end (265) of the third arcuate flow passage (26) are in communication with an external liquid inlet tube;

the outlet end (252) of the second arcuate flow passage (25) and the outlet end (271) of the fourth arcuate flow passage (27) are in communication with an external liquid outlet pipe;

the ends of the first arched flow passage (24), the second arched flow passage (25), the third arched flow passage (26) and the fourth arched flow passage (27) are all closed.

5. The flow battery cell module of claim 1, wherein the at least three seal-assembled battery stack comprises:

a first stack (31);

a second stack (32) sealingly assembled with the first stack (31);

at least one third stack (33) arranged between the first stack (31) and the second stack (32), the first stack (31), the second stack (32) and the at least one third stack (33) being sealingly assembled;

the first stack (31) is disposed adjacent the first flow channel end plate (21) and sealingly assembled with the first flow channel end plate (21);

the second stack (32) is disposed adjacent the second flow field end plate (22) and sealingly engages the second flow field end plate (22).

6. The flow battery cell module of claim 5, wherein the first stack (31) comprises: a first bipolar plate (310), a first electrode (311), a first outer frame (312), a first separator (314), a second electrode (315), a second outer frame (316), a first inner frame (318), and a second inner frame (319);

wherein the first outer frame (312) is sleeved on the first electrode (311);

a first mounting platform is arranged on a first end face of the first outer frame (312), and the first bipolar plate (310) is fixed on the first mounting platform;

the first inner frame (318) is sleeved on the first electrode (311), the second end face of the first inner frame (318) is assembled and connected with the second end face of the first outer frame (312), and after the first outer frame (312) is assembled with the first inner frame (318), a plurality of first flow through cavities communicated with the first electrode (311) are formed;

the first diaphragm (314) is arranged between the first electrode (311) and the second electrode (315), and is respectively connected with the first end face of the first electrode (311), the second electrode (315), the first end face of the first inner frame (318) and the first end face of the second outer frame (316);

the second inner frame (319) and the second outer frame (316) are sleeved on the second electrode (315);

a second end face of the second inner frame (319) is assembled and connected with a second end face of the second outer frame (316), and a plurality of second flow through cavities communicated with the second electrode (315) are formed after the second outer frame (316) and the second inner frame (319) are assembled;

the first end face of the first outer frame (312) is fixedly connected with the first flow channel end plate (21), the second end face of the first outer frame (312) is fixedly connected with the first end face of the second outer frame (316), and the first end face of the second outer frame (316) is fixedly connected with the third stack (33).

7. The flow battery cell module of claim 6, wherein the first stack (31) further comprises:

a first current collector (317) in contact with the first bipolar plate (310).

8. The flow battery cell module of claim 6, wherein the second stack (32) comprises:

a second bipolar plate (320);

a third outer frame (322) sleeved on the second bipolar plate (320);

a second current collector (327) in contact with the second bipolar plate (320);

the second end face of the third outer frame (322) is fixedly connected with the second flow channel end plate (22), and the first end face of the third outer frame (322) is fixedly connected with the third stack (33).

9. The flow battery cell module of claim 8, wherein the third stack (33) comprises: a fourth bipolar plate (330), a fifth electrode (331), a fifth outer frame (332), a third separator (334), a sixth electrode (335), a sixth outer frame (336), a fifth inner frame (338), and a sixth inner frame (339);

wherein the fifth outer frame (332) is sleeved on the fifth electrode (331);

a third mounting platform is arranged on the first end face of the fifth outer frame (332), and the fourth bipolar plate (330) is fixed on the third mounting platform;

the fifth inner frame (338) is sleeved on the fifth electrode (331), the second end face of the fifth inner frame (338) is assembled and connected with the second end face of the fifth outer frame (332), and after the fifth outer frame (332) is assembled with the fifth inner frame (338), a plurality of fourth circulation cavities communicated with the fifth electrode (331) are formed;

the third diaphragm (334) is arranged between the fifth electrode (331) and the sixth electrode (335), and is respectively connected with the first end surfaces of the fifth electrode (331), the sixth electrode (335), the fifth inner frame (338) and the first end surface of the sixth outer frame (336);

the sixth inner frame (339) and the sixth outer frame (336) are sleeved on the sixth electrode (335);

the second end face of the sixth inner frame (339) is assembled and connected with the second end face of the sixth outer frame (336), and a plurality of fifth circulation cavities communicated with the sixth electrode (335) are formed after the sixth outer frame (336) and the sixth inner frame (339) are assembled;

the second end surface of the fifth outer frame (332) is fixedly connected with the first end surface of the sixth outer frame (336);

the first end face of the fifth outer frame (332) is fixedly connected with the second end face of the second outer frame (316), and the second end face of the sixth outer frame (336) is fixedly connected with the first end face of the third outer frame (322).

Images