CN220121953U

CN220121953U - Liquid cooling structure and battery pack

Info

Publication number: CN220121953U
Application number: CN202321688122.5U
Authority: CN
Inventors: 李世远
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-12-01
Anticipated expiration: 2033-06-29

Abstract

The utility model discloses a liquid cooling structure and a battery pack, which comprises a liquid cooling plate attached to a battery module, wherein the liquid cooling plate comprises: the coolant flows to the first flow channel and the second flow channel which are oppositely arranged, and the outlet of the first flow channel is communicated with the inlet of the second flow channel through a conductive current collector so as to form a loop; the plurality of first flow passages are arranged on one side of the liquid cooling plate in parallel, and the plurality of second flow passages are arranged on the other side of the liquid cooling plate in parallel. According to the utility model, the first flow channel and the second flow channel are communicated through the current collector, so that a loop is formed, the flowing distance of the cooling liquid is prolonged, the flowing time of the cooling liquid is prolonged, the uniformity of the cooling liquid is improved, and the cooling efficiency is improved; in addition, the utility model effectively improves the flow uniformity of the cooling liquid by arranging a plurality of loops in parallel, reduces the flow resistance of the cooling liquid and improves the flow speed, thereby further improving the cooling effect.

Description

Liquid cooling structure and battery pack

Technical Field

The utility model relates to the technical field of battery production, in particular to a liquid cooling structure and a battery pack.

Background

In order to enable the high temperature of the battery pack to be effectively radiated or the low temperature to be efficiently warmed, a liquid cooling plate is generally adopted to ensure that the battery pack works in a proper temperature range. Specifically, the heat of the battery is transferred to the cooling liquid through the liquid cooling plate, and the cooling liquid takes away the heat so as to achieve the purpose of cooling the battery pack. The structural design of the liquid cooling plate can directly influence the heating capacity, the cooling capacity and the temperature equalizing capacity of the battery pack.

At present, the liquid cooling flow channels of the liquid cooling plate adopt a serial arrangement mode, namely one end is fed with liquid and the other end is discharged with liquid. But the liquid cooling plates in the serial flow mode have the problems of low heat dissipation efficiency, large temperature difference of the battery cells and uneven temperature distribution, so that the safe and reliable operation of the battery pack is influenced, and the service life of the battery pack is shortened.

Disclosure of Invention

In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present utility model provides a liquid cooling structure and a battery pack, including a liquid cooling plate attached to a battery module, the liquid cooling plate includes: the coolant flows to the first flow channel and the second flow channel which are oppositely arranged, and the outlet of the first flow channel is communicated with the inlet of the second flow channel through a conductive current collector so as to form a loop; the plurality of first flow passages are arranged on one side of the liquid cooling plate in parallel, and the plurality of second flow passages are arranged on the other side of the liquid cooling plate in parallel.

According to the utility model, the first flow channel and the second flow channel are communicated through the current collector, so that a loop is formed, the flowing distance of the cooling liquid is prolonged, the flowing time of the cooling liquid is prolonged, the uniformity of the cooling liquid is improved, and the cooling efficiency is improved; in addition, the utility model effectively improves the flow uniformity of the cooling liquid by arranging a plurality of loops in parallel, reduces the flow resistance of the cooling liquid and improves the flow speed, thereby further improving the cooling effect.

In-process, the coolant liquid gets into the liquid cooling board in, and the in-process that the coolant liquid flows along first runner is to battery module heat exchange, takes away battery module's heat, reduces its temperature, then the coolant liquid is in entering switch-on current collector department, then in by the reposition of redundant personnel entering a plurality of second runners to heat exchange to battery module again, further strengthen the cooling effect, then coolant liquid discharge liquid cooling board.

In some embodiments, the number of first flow channels is the same or different than the number of second flow channels.

The number of the first flow channels and the second flow channels may be the same or different.

In addition, in some embodiments, the cooling liquid in the plurality of first flow channels is collected at the conducting current collector and then flows into the plurality of second flow channels by the conducting current collector, in other embodiments, the plurality of first flow channels and the plurality of second flow channels can be arranged in one-to-one correspondence, so in this embodiment, the number of first flow channels and the number of second flow channels are the same, and the number of conducting current collectors is equal to the number of first flow channels.

In some embodiments, further comprising: the liquid inlet pipe is communicated with the inlets of the first flow channels; the liquid outlet pipe is communicated with the outlets of the second flow passages; the feed liquor pipe is provided with the inlet, and the drain pipe is provided with the liquid outlet, and the liquid outlet quantity is more than the inlet quantity.

In-process, coolant liquid gets into the feed liquor pipe from the inlet after, shunts and gets into a plurality of liquid cooling boards, and the in-process that the coolant liquid flows along first flow channel to battery module heat exchange, takes away battery module's heat, reduces its temperature, then coolant liquid gathers in switch-on current collector department, later shunts and gets into a plurality of second flow channels to again to battery module heat exchange, further strengthen the cooling effect, then coolant liquid gathers to the liquid current collector after, discharges through the liquid outlet of drain pipe.

It should be noted that the number of the liquid outlets is more than that of the liquid inlets, so that the flow rate of the liquid outlets is greater than that of the liquid inlets, and the pressure of the liquid outlets is smaller than that of the liquid inlets, and under the action of the pressure, the cooling liquid is accelerated to flow towards the liquid outlets, so that the flow path of the cooling liquid is optimized, and the problem of resistance increase caused by longer flow distance of the cooling liquid is solved to a certain extent.

In some embodiments, the liquid inlet pipe is provided with one liquid inlet, and the liquid outlet pipe is provided with two liquid outlets.

In some embodiments, the plurality of liquid cooling plates are arranged at intervals along the length direction of the liquid inlet pipe, and the liquid inlet is arranged at the middle part of the liquid inlet pipe.

The utility model also provides a liquid inlet arranged on the liquid inlet pipe and close to the center of the battery module, so that the cooling liquid can cool the battery cell in the center of the battery module preferentially.

It is easy to understand that the battery cell at the center has fewer heat dissipation surfaces and higher temperature than the battery cell at the periphery, so that the temperature uniformity of the battery module can be improved and the temperature difference is reduced by the arrangement.

In some embodiments, the liquid inlet collector and the liquid outlet collector are further included; the liquid inlet pipe is communicated with each first flow passage through a liquid inlet current collector, and the liquid outlet pipe is communicated with each second flow passage through a liquid outlet current collector.

In this embodiment, the liquid inlet collector and the liquid outlet collector are integrally formed. That is, by arranging a current collector and arranging a separator in the current collector, the current collector is divided into two cavities which are not communicated with each other, wherein one cavity is communicated with a liquid inlet pipe and a plurality of first flow channels, the cavity forms a liquid inlet current collector, and the other cavity is communicated with a liquid outlet pipe and a plurality of second flow channels, and the cavity forms a liquid outlet current collector.

In some embodiments, the plurality of first flow channels are disposed on an upper side of the liquid cooling plate and the plurality of second flow channels are disposed on a lower side of the liquid cooling plate.

It should be noted that, in this embodiment, the liquid cooling plate is disposed between two rows of battery modules, and the plurality of first flow channels are all disposed on the upper side of the liquid cooling plate, and the plurality of second flow channels are all disposed on the lower side of the liquid cooling plate, so that under the action of gravitational potential energy, the cooling liquid has a tendency to move downward, thereby improving the flow velocity of the cooling liquid, and at the same time, improving the problem of increasing the resistance caused by the longer flow distance of the cooling liquid to a certain extent.

In some embodiments, the liquid cooling plate is a serpentine liquid cooling plate.

It should be noted that the present utility model is applicable to both cylindrical battery modules and prismatic battery modules. When being applicable to cylinder battery module and liquid cooling board setting between two battery module of being listed as, adopt the snakelike liquid cooling board, can increase the area of contact with the cylinder battery surface to promote the cooling effect.

The utility model also provides a battery pack comprising the liquid cooling structure, wherein the liquid cooling plate is arranged at the top or bottom or at the side of the battery module.

It will be appreciated that the liquid cooling plates can be disposed at different positions of the battery module according to different specific requirements.

In some embodiments, one liquid cooling plate is arranged between every two rows of battery modules, and the number of the liquid cooling plates is half of the number of the rows of the battery modules.

It should be noted that, in this embodiment, the liquid cooling plates are disposed between two rows of battery modules, and the number of liquid cooling plates is half of the number of rows of battery modules, and in some embodiments, the number of liquid cooling plates is different. For example, when the liquid cooling plates are all clamped between two rows of battery modules, the number of the liquid cooling plates is the number of the battery modules minus one; when the liquid cooling plates are arranged at the top or the bottom of the corresponding array of battery modules, the number of the liquid cooling plates is equal to the array of the battery modules.

In some embodiments, a heat conducting glue layer is filled between the liquid cooling plate and the battery module.

It is easy to understand that the heat-conducting glue layer is coated on the surface, in contact with the battery module, of the liquid cooling plate, and therefore heat exchange efficiency can be enhanced.

In summary, the liquid cooling structure and the battery pack provided by the utility model have the following technical effects:

(1) According to the utility model, the first flow channel and the second flow channel are communicated by the current collector, so that a loop is formed, the flowing distance of the cooling liquid is prolonged, the flowing time of the cooling liquid is prolonged, the uniformity of the cooling liquid is improved, and the cooling efficiency is improved.

(2) According to the utility model, the plurality of loops consisting of the first flow channels and the second flow channels are arranged in parallel, so that the flow uniformity of the cooling liquid is effectively improved, the flow resistance of the cooling liquid is reduced, the flow speed is increased, and the cooling effect is further improved.

(3) The utility model also provides a liquid inlet arranged on the liquid inlet pipe and close to the center of the battery module, so that the cooling liquid can cool the battery cell in the center of the battery module preferentially. It is easy to understand that the battery cell at the center has fewer heat dissipation surfaces and higher temperature than the battery cell at the periphery, so that the temperature uniformity of the battery module can be improved and the temperature difference is reduced by the arrangement.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

fig. 2 is a schematic view of a structure without a battery module;

FIG. 3 is a schematic cross-sectional view of a front-end current collector;

fig. 4 is a schematic cross-sectional view of a conductive current collector.

Wherein the reference numerals have the following meanings:

1. a liquid cooling structure; 11. a battery module;

2. a liquid cooling plate; 21. a first flow passage; 22. a second flow passage;

3. a front-end current collector; 31. a liquid inlet current collector; 32. a liquid-outlet current collector; 33. a spacer;

4. conducting the current collector;

5. a liquid inlet pipe; 51. a liquid inlet;

6. a liquid outlet pipe; 61. and a liquid outlet.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Please refer to fig. 1 and 4, a liquid cooling structure and a battery pack, including laminating set up in the liquid cooling plate 2 of battery module 11, liquid cooling plate 2 includes: the coolant flows to the first flow channel 21 and the second flow channel 22 which are oppositely arranged, and the outlet of the first flow channel 21 is communicated with the inlet of the second flow channel 22 through the conductive current collector 4 so as to form a loop; the plurality of first flow passages 21 are arranged in parallel on one side of the liquid cooling plate 2, and the plurality of second flow passages 22 are arranged in parallel on the other side of the liquid cooling plate 2.

In the process, the cooling liquid enters the liquid cooling plate 2, and in the process that the cooling liquid flows along the first flow channel 21, heat of the battery module 11 is exchanged, heat of the battery module 11 is taken away, the temperature of the battery module is reduced, then the cooling liquid enters the position of the conductive current collector 4 and is split into a plurality of second flow channels 22, so that the battery module 11 is exchanged again, the cooling effect is further enhanced, and then the cooling liquid is discharged out of the liquid cooling plate 2.

The number of the first flow passages 21 and the second flow passages 22 may be the same or different.

In addition, in this embodiment, the cooling liquid in the plurality of first flow channels 21 is collected at the conducting current collector 4 and is split into the plurality of second flow channels 22 by the conducting current collector 4, and in other embodiments, the plurality of first flow channels 21 and the plurality of second flow channels 22 can be disposed in one-to-one correspondence, so in this embodiment, the number of first flow channels 21 and the number of second flow channels 22 are the same, and the number of conducting current collectors 4 is equal to the number of first flow channels 21.

The utility model connects the first runner 21 and the second runner 22 by the current collector 4, thereby forming a loop, prolonging the flowing distance of the cooling liquid, prolonging the flowing time of the cooling liquid, improving the uniformity of the cooling liquid and improving the cooling efficiency; in addition, the utility model effectively improves the flow uniformity of the cooling liquid by arranging a plurality of loops in parallel, reduces the flow resistance of the cooling liquid and improves the flow speed, thereby further improving the cooling effect.

Referring to fig. 1, 2 and 3, the method further includes: the liquid inlet pipe 5 is communicated with the inlets of the first flow channels 21; a liquid outlet pipe 6 communicated with the outlets of the second flow passages 22; the liquid inlet pipe 5 is provided with liquid inlets 51, the liquid outlet pipe 6 is provided with liquid outlets 61, and the number of the liquid outlets 61 is more than that of the liquid inlets 51. Preferably, in this embodiment, the liquid inlet pipe 5 is provided with one liquid inlet 51, and the liquid outlet pipe 6 is provided with two liquid outlets 61. The liquid cooling plates 2 are arranged at intervals along the length direction of the liquid inlet pipe 5, and the liquid inlet 51 is arranged in the middle of the liquid inlet pipe 5.

Referring to fig. 2 and 3, the liquid inlet collector 31 and the liquid outlet collector 32 are further included; the liquid inlet pipe 5 is communicated with each first flow channel 21 through a liquid inlet current collector 31, and the liquid outlet pipe 6 is communicated with each second flow channel 22 through a liquid outlet current collector 32.

In the process, after the cooling liquid enters the liquid inlet pipe 5 from the liquid inlet 51, the cooling liquid is split into a plurality of liquid cooling plates 2, and then is split into a plurality of first flow channels 21 by the liquid inlet current collector 31 of the liquid cooling plates 2, in the process that the cooling liquid flows along the first flow channels 21, the heat of the battery module 11 is taken away, the temperature of the battery module 11 is reduced, then the cooling liquid is collected at the position of the current collector 4, and then is split into a plurality of second flow channels 22, so that the heat exchange of the battery module 11 is performed again, the cooling effect is further enhanced, and then the cooling liquid is discharged through the liquid outlet 61 of the liquid outlet pipe 6 after being collected to the liquid outlet current collector 32.

It should be noted that the number of the liquid outlets 61 is greater than the number of the liquid inlets 51 in the present utility model, so that the flow rate of the liquid outlets 61 is greater than the flow rate of the liquid inlets 51, and thus the pressure of the liquid outlets 61 is smaller than the pressure of the liquid inlets 51, and under the action of the pressure, the cooling liquid is accelerated to flow towards the liquid outlets 61, so that the cooling liquid flowing path is optimized, and the problem of increasing resistance caused by the longer flowing distance of the cooling liquid is improved to a certain extent.

The utility model also arranges the liquid inlet 51 on the liquid inlet pipe 5 near the center of the battery module 11, so that the cooling liquid can cool the battery core at the center of the battery module 11 preferentially.

It is understood that the battery cell at the center has fewer heat dissipation surfaces and higher temperature than the battery cell at the periphery, and therefore, the arrangement can improve the temperature uniformity of the battery module 11 and reduce the temperature difference.

In this embodiment, the liquid inlet collector 31 and the liquid outlet collector 32 are integrally formed. That is, by providing one current collector and providing a separator 33 in the current collector to divide the current collector into two cavities not communicating with each other, one of which is communicated with the liquid inlet pipe 5 and the plurality of first flow passages 21, the cavity constitutes the liquid inlet current collector 31, and the other of which is communicated with the liquid outlet pipe 6 and the plurality of second flow passages 22, the cavity constitutes the liquid outlet current collector 32.

Referring to fig. 1, 3 and 4, in the present embodiment, a plurality of first flow passages 21 are disposed on the upper side of the liquid cooling plate 2, and a plurality of second flow passages 22 are disposed on the lower side of the liquid cooling plate 2.

In the present embodiment, the liquid cooling plate 2 is disposed between two rows of battery modules 11, and the plurality of first flow channels 21 are disposed on the upper side of the liquid cooling plate 2, and the plurality of second flow channels 22 are disposed on the lower side of the liquid cooling plate 2, so that the cooling liquid has a tendency to move downward under the action of gravitational potential energy, thereby increasing the flow rate of the cooling liquid, and at the same time, to some extent, solving the problem of increasing resistance caused by the longer flow distance of the cooling liquid.

Referring to fig. 1 or 2, the liquid cooling plate 2 is a serpentine liquid cooling plate.

It should be noted that the present utility model is applicable to both the cylindrical battery module 11 and the prismatic battery module 11. When being applicable to cylinder battery module 11 and liquid cooling board 2 set up between two battery module 11, adopt snakelike liquid cooling board 2, can increase the area of contact with the cylinder battery surface to promote the cooling effect.

Referring to fig. 1 and 2, in another aspect, the present utility model further provides a battery pack, including the above-mentioned liquid cooling structure, and the liquid cooling plate 2 is disposed at the top or bottom or side of the battery module 11.

It will be appreciated that the liquid cooling plate 2 can be disposed at different positions of the battery module 11 according to specific requirements.

Referring to fig. 1 and 2, a liquid cooling plate 2 is disposed between each two rows of battery modules 11, and the number of liquid cooling plates 2 is half of the number of rows of battery modules 11.

In this embodiment, the liquid cooling plates 2 are disposed between two rows of the battery modules 11, and the number of the liquid cooling plates 2 is half of the number of rows of the battery modules 11, and in some embodiments, the number of the liquid cooling plates 2 is different. For example, when the liquid cooling plates 2 are all sandwiched between two rows of battery modules 11, the number of the liquid cooling plates 2 is one minus the number of rows of battery modules 11; when the liquid cooling plates 2 are all arranged at the top or bottom of the corresponding row of battery modules 11, the number of the liquid cooling plates 2 is equal to the number of the rows of the battery modules 11.

A heat conducting glue layer is filled between the liquid cooling plate 2 and the battery module 11.

It will be appreciated that the heat-conducting glue layer is coated on the surface of the liquid cooling plate 2, which is in contact with the battery module 11, so that the heat exchange efficiency can be enhanced.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. The utility model provides a liquid cooling structure, its characterized in that, including laminating set up in liquid cooling board (2) of battery module (11), liquid cooling board (2) include:

the coolant flows to the first runner (21) and the second runner (22) which are oppositely arranged, and the outlet of the first runner (21) is communicated with the inlet of the second runner (22) through a conductive current collector (4) so as to form a loop;

the plurality of first flow channels (21) are arranged on one side of the liquid cooling plate (2) in parallel, and the plurality of second flow channels (22) are arranged on the other side of the liquid cooling plate (2) in parallel.

2. A liquid cooling structure according to claim 1, wherein the number of the first flow channels (21) and the number of the second flow channels (22) are the same or different.

3. The liquid cooling structure according to claim 1 or 2, further comprising:

a liquid inlet pipe (5) communicated with the inlet of each first flow channel (21);

a liquid outlet pipe (6) communicated with the outlet of each second flow passage (22);

the liquid inlet pipe (5) is provided with a liquid inlet (51), the liquid outlet pipe (6) is provided with a liquid outlet (61), and the number of the liquid outlets (61) is more than that of the liquid inlets (51).

4. A liquid cooling structure according to claim 3, characterized in that said liquid inlet pipe (5) is provided with one of said liquid inlet openings (51), and said liquid outlet pipe (6) is provided with two of said liquid outlet openings (61).

5. A liquid cooling structure according to claim 3, wherein a plurality of liquid cooling plates (2) are arranged at intervals along the length direction of the liquid inlet pipe (5), and the liquid inlet (51) is arranged in the middle of the liquid inlet pipe (5).

6. A liquid cooling structure according to claim 3, further comprising a liquid inlet collector (31) and a liquid outlet collector (32);

the liquid inlet pipe (5) is communicated with each first runner (21) through the liquid inlet current collector (31), and the liquid outlet pipe (6) is communicated with each second runner (22) through the liquid outlet current collector (32).

7. A liquid cooling structure according to any one of claims 1, 2, or 4 to 6, wherein a plurality of the first flow passages (21) are provided on the upper side of the liquid cooling plate (2), and a plurality of the second flow passages (22) are provided on the lower side of the liquid cooling plate (2).

8. The liquid cooling structure according to claim 7, wherein the liquid cooling plate (2) is a serpentine liquid cooling plate.

9. A battery pack comprising a liquid cooling structure according to any one of claims 1 to 8, wherein the liquid cooling plate (2) is provided at the top or bottom or side of the battery module (11).

10. The battery pack according to claim 9, wherein one liquid cooling plate (2) is provided between each two rows of the battery modules (11), and the number of the liquid cooling plates (2) is half the number of the rows of the battery modules (11).

11. The battery pack according to claim 10, wherein a heat conducting glue layer is filled between the liquid cooling plate (2) and the battery module (11).