CN220290904U - Liquid cooling assembly and battery pack - Google Patents

Abstract

The utility model discloses a liquid cooling assembly and a battery pack, and belongs to the technical field of power batteries. The liquid cooling assembly comprises a water inlet main runner and a water return main runner which are communicated with each other, a first runner and a second runner, wherein the water inlet main runner and the water return main runner extend along a first direction, the water inlet main runner and the water return main runner are distributed along a second direction, the water inlet main runner is communicated with a main water inlet, the water return main runner is communicated with a main water outlet, and the water inlet main runner is provided with a split water inlet; the first runner and the second runner are arranged along a first direction, the main water inlet and the main water outlet are arranged towards the first runner, the first runner and the second runner are positioned between the water inlet main runner and the water return main runner, the water inlet is communicated with the second runner, the second runner is communicated with the first runner, and the first runner is communicated with the water return main runner, so that the problem that the cooling fluid flows towards the tail end and is small in flow, the tail end battery cell is heated or cooled too slowly, the control of the whole package temperature difference is not facilitated, and the service life of the battery pack is influenced is solved.

Description

Liquid cooling assembly and battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a liquid cooling assembly and a battery pack.

Background

The battery pack comprises electric cores, and the endurance requirements of the end users can be guaranteed by increasing the number of the electric cores. However, with the increase of the number of the battery cells, certain difficulties are brought to the control and uniformity of the temperature of the whole battery cells. In the prior art, a large-scale stamping plate is adopted in the battery pack, and the stamping plate is contacted with a plurality of electric cores to realize liquid cooling of the electric cores. Because the runner of the stamping plate is overlong, the flow of the cooling liquid to the tail end is smaller, so that the tail end battery core is heated or cooled too slowly, the control of the whole package temperature difference is not facilitated, and the service life of the battery pack is influenced.

Disclosure of Invention

The utility model aims to provide a liquid cooling assembly and a battery pack, which solve the problems that the temperature difference of the whole battery pack is not controlled easily and the service life of the battery pack is influenced due to the fact that the tail end battery core is heated or cooled too slowly due to the fact that the flow of a cooling liquid to the tail end is smaller.

To achieve the purpose, the utility model adopts the following technical scheme:

in one aspect, a liquid cooling assembly is provided, comprising:

the water inlet main runner and the water return main runner are communicated with each other, extend along a first direction, are distributed along a second direction, are communicated with a main water inlet, are communicated with a main water outlet, and are provided with split water inlets;

the first runner and the second runner are arranged along the first direction, the main water inlet and the main water outlet are all arranged towards the first runner, the first runner and the second runner are positioned between the water inlet main runner and the water return main runner, the water inlet is communicated with the second runner, the second runner is communicated with the first runner, and the first runner is communicated with the water return main runner.

In some possible embodiments, the two water inlet main runners are arranged, the water return main runners are located between the two water inlet main runners, the two water inlet main runners are all communicated with the main water inlet, the two first runners and the two second runners are all arranged, and the two first runners and the two second runners are symmetrically arranged on two sides of the water return main runners.

In some possible embodiments, the second flow channels are provided with a plurality of second flow channels along the first direction, the water inlet main flow channel is provided with a plurality of branch water inlets along the first direction, the branch water inlets are correspondingly communicated with the second flow channels, and the second flow channels are communicated with the first flow channels.

In some possible embodiments, the water treatment device further comprises a third flow passage, wherein the third flow passage is arranged between the second flow passage and the water return main flow passage, a plurality of openings are formed in the side wall of the third flow passage along the first direction, the openings are correspondingly communicated with the second flow passages, and the third flow passage is communicated with the first flow passage.

In some possible embodiments, the first flow channels are provided with a plurality along the second direction, the first flow channels are communicated with each other, and the first flow channels are communicated with the second flow channels; and/or

The second flow channels are arranged in the second direction, a plurality of second flow channels are communicated with each other, the second flow channels are communicated with the water distribution inlets, and the second flow channels are communicated with the first flow channels.

In some possible embodiments, when a plurality of first flow channels are provided, the liquid cooling assembly further comprises a fourth flow channel, a side wall of the fourth flow channel is provided with a plurality of openings, the plurality of openings are correspondingly communicated with the plurality of first flow channels, and the fourth flow channel is communicated with the second flow channel;

when a plurality of second flow channels are arranged, the liquid cooling assembly further comprises a fifth flow channel, a plurality of openings are formed in the side wall of the fifth flow channel, the openings are correspondingly communicated with the second flow channels, and the fifth flow channel is communicated with the split water inlet.

In some possible embodiments, the water inlet main flow channel, the water return main flow channel, the first flow channel and the second flow channel are formed through the grooves.

In some possible embodiments, the second cold plate faces outward and the first cold plate faces the cell.

In some possible embodiments, the second cold plate is provided with ribs and/or openings.

In some possible embodiments, the first flow channel and the second flow channel are both serpentine flow channels.

In another aspect, a battery pack is provided, including a battery cell and a liquid cooling assembly as described above, where the liquid cooling assembly is configured to cool or heat the battery cell.

In some possible embodiments, a heat conducting glue layer is arranged between the battery cell and the liquid cooling component.

In some possible embodiments, the electric power box further comprises a box frame, the liquid cooling assembly is arranged at the bottom of the box frame, the box frame comprises a box outer frame and a cross beam arranged inside the box outer frame, the box outer frame and the liquid cooling assembly form an accommodating space, the electric core is accommodated in the accommodating space, the cross beam is used for separating the accommodating space, and the box outer frame and the cross beam are connected with the liquid cooling assembly through an FDS technology.

In some possible embodiments, the cross member is disposed between the first flow passage and the second flow passage.

The utility model has the beneficial effects that:

according to the liquid cooling assembly and the battery pack, as the main water inlet is arranged towards the first flow channel, the temperature of the front end of the water inlet main flow channel is lower than that of the tail end of the water inlet main flow channel, namely the temperature of the front end is lower than that of the tail end. The water inlet is communicated with the second flow channel, the second flow channel is communicated with the first flow channel, the first flow channel is communicated with the backwater main flow channel, and the temperature of the second flow channel is lower than that of the first flow channel, namely the temperature of the tail end is lower than that of the front end. Through the arrangement of the water inlet main runner, the first runner and the second runner, the front end temperature and the tail end temperature are uniform, the temperature uniformity of the whole package is ensured, and the cycle service life of the battery cell is prolonged.

Drawings

FIG. 1 is a schematic view of an installation of a liquid cooling assembly and a tank frame provided in accordance with an embodiment of the present utility model;

fig. 2 is a schematic view of a flow channel formed on a second cold plate according to an embodiment of the present utility model.

In the figure:

100. a liquid cooling assembly; 101. a first cold plate; 1011. reinforcing ribs; 1012. opening holes; 1013. a turbulence structure; 102. a second cold plate; 103. a water inlet joint; 104. a water outlet joint;

1. a water inlet main runner; 11. a split water inlet; 2. a backwater main flow passage; 3. a first flow passage; 4. a second flow passage; 5. a third flow passage; 6. a fourth flow passage; 7. a fifth flow passage; 8. a sixth flow passage;

200. a box frame; 201. a box body outer frame; 202. and a cross beam.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The present embodiment provides a battery pack, as shown in fig. 1 and 2, including a battery cell and a liquid cooling assembly 100, where the liquid cooling assembly 100 is used for cooling or heating the battery cell. The present embodiment also provides a liquid cooling assembly 100, which includes a water inlet main flow channel 1 and a water return main flow channel 2, a first flow channel 3 and a second flow channel 4, which are mutually communicated. The water inlet main runner 1 and the water return main runner 2 extend along the first direction, the water inlet main runner 1 and the water return main runner 2 are distributed along the second direction, the water inlet main runner 1 is communicated with the main water inlet, the water return main runner 2 is communicated with the main water outlet, and the water inlet main runner 1 is provided with the split water inlet 11. The first flow channel 3 and the second flow channel 4 are arranged along the first direction, the main water inlet and the main water outlet are arranged towards the first flow channel 3, the first flow channel 3 and the second flow channel 4 are positioned between the water inlet main flow channel 1 and the water return main flow channel 2, the water inlet 11 is communicated with the second flow channel 4, the second flow channel 4 is communicated with the first flow channel 3, and the first flow channel 3 is communicated with the water return main flow channel 2.

Alternatively, the water inlet main flow passage 1 and the water return main flow passage 2 are parallel to each other.

As shown in fig. 2, the first direction is the X direction, the second direction is the Y direction, and the liquid cooling assembly 100 is illustratively rectangular, the first direction is the length direction of the liquid cooling assembly 100, the second direction is the width direction of the liquid cooling assembly 100, and the first direction and the second direction are perpendicular to each other. In other embodiments, the first direction and the second direction may be disposed at any other included angle, which is not limited.

During liquid cooling, the flow direction of the cooling liquid is as follows: the main water inlet enters the water inlet main flow channel 1, part of cooling liquid in the water inlet main flow channel 1 flows to the first flow channel 3 through the second flow channel 4, flows to the water return main flow channel 2 through the first flow channel 3, and the other part of cooling liquid in the water inlet main flow channel 1 directly flows to the water return main flow channel 2, so that cooling liquid circulation is realized, and cooling of the battery cell is realized.

Illustratively, the first direction is a front-to-back direction, the first flow channel 3 is toward the front end cell of the battery pack, and the second flow channel 4 is toward the rear end cell of the battery pack. Illustratively, the liquid cooling assembly 100 is used to cool the battery cells. Since the main water inlet is arranged towards the first flow channel 3, the temperature of the front end of the water inlet main flow channel 1 is lower than the temperature of the tail end of the water inlet main flow channel 1, namely the temperature of the front end is lower than the temperature of the tail end. Since the split water inlet 11 is communicated with the second flow passage 4, the second flow passage 4 is communicated with the first flow passage 3, the first flow passage 3 is communicated with the backwater main flow passage 2, and the temperature of the second flow passage 4 is lower than that of the first flow passage 3, namely, the temperature of the tail end is lower than that of the front end. Through the arrangement of the water inlet main flow channel 1, the first flow channel 3 and the second flow channel 4, the temperature of the front end and the tail end is uniform, the uniformity of the temperature of the whole package is ensured, and the cycle service life of the battery cell is prolonged. The coolant liquid of the water inlet main runner 1 flows back through the second runner 4 and the first runner 3 and flows back through the water return main runner 2, so that the excessive flow is avoided, and the purpose of more uniform flow distribution is realized.

The water inlet main flow channel 1 is provided with two, the water return main flow channel 2 is positioned between the two water inlet main flow channels 1, the two water inlet main flow channels 1 are communicated with the main water inlet, the first flow channel 3 and the second flow channel 4 are provided with two, and the two first flow channels 3 and the two second flow channels 4 are symmetrically arranged on two sides of the water return main flow channel 2. The two second flow passages 4 are respectively supplied with cooling liquid through the water inlet main flow passages 1 at two sides, so that the flow rates of the two second flow passages 4 are independently controlled, the flow resistance of the whole flow passage is reduced, and the problem of large temperature difference of the system is solved. And the whole structure is symmetrical, thereby being beneficial to optimizing and adjusting the flow channel and improving the design efficiency.

The second flow channels 4 are provided with a plurality of branch water inlets 11 along the first direction, the water inlet main flow channel 1 is provided with a plurality of branch water inlets 11 along the first direction, the branch water inlets 11 are correspondingly communicated with the plurality of second flow channels 4, the plurality of second flow channels 4 are communicated with the first flow channel 3, and each branch water inlet 11 independently enters the second flow channel 4 to realize independent control of the flow of the plurality of second flow channels 4. Illustratively, two split inlets 11 are provided, the two split inlets 11 being in corresponding communication with the two second flow passages 4.

The liquid cooling assembly 100 further includes a third flow channel 5, the third flow channel 5 is disposed between the second flow channel 4 and the main return water flow channel 2, a plurality of openings are disposed on a sidewall of the third flow channel 5 along the first direction, the plurality of openings are correspondingly communicated with the plurality of second flow channels 4, and the third flow channel 5 is communicated with the first flow channel 3. By providing the third flow passage 5, communication between the plurality of second flow passages 4 and the first flow passage 3 is achieved, simplifying the structure.

The first flow channels 3 are arranged in a plurality along the second direction, the first flow channels 3 are communicated with each other, the first flow channels 3 are communicated with the second flow channels 4, the parallel connection of the first flow channels 3 is ensured, and the temperature uniformity is improved. Further, the liquid cooling assembly 100 further includes a fourth flow channel 6, wherein a plurality of openings are formed on a side wall of the fourth flow channel 6, and the plurality of openings are correspondingly communicated with the plurality of first flow channels 3, and the fourth flow channel 6 is communicated with the second flow channel 4, so that communication between the second flow channel 4 and the plurality of first flow channels 3 is realized. The fourth flow channel 6 extends along the second direction, and the plurality of openings are formed along the second direction.

The second flow channels 4 are arranged in a plurality along the second direction, the second flow channels 4 are communicated with each other, the second flow channels 4 are communicated with the water distribution inlets 11, the second flow channels 4 are communicated with the first flow channels 3, and the second flow channels 4 are connected in parallel, so that the temperature uniformity is improved. Further, the liquid cooling assembly 100 further includes a fifth flow channel 7, a plurality of openings are provided on a side wall of the fifth flow channel 7, the plurality of openings are correspondingly communicated with the plurality of second flow channels 4, and the fifth flow channel 7 is communicated with the split water inlet 11, so that communication between the split water inlet 11 and the plurality of second flow channels 4 is realized. The fifth flow channel 7 extends along the second direction, and the plurality of openings are formed along the second direction.

Further, the first flow channel 3 and the second flow channel 4 are both serpentine flow channels. The serpentine flow passages of the first flow passages 3 and the second flow passages 4 are respectively communicated and arranged along the second direction, and the serpentine flow passages of the second flow passages 4 are communicated and arranged along the first direction, so that a labyrinth with a plurality of inlets and a plurality of outlets is formed, and the temperature uniformity is further improved.

The liquid cooling assembly 100 comprises a first cold plate 101 and a second cold plate 102, the second cold plate 102 is provided with a groove, the first cold plate 101 is a flat plate, the first cold plate 101 is connected with the second cold plate 102, and a water inlet main flow channel 1, a water return main flow channel 2, a first flow channel 3 and a second flow channel 4 are formed through the groove, so that the structures of the first cold plate 101 and the second cold plate 102 are simplified, and the manufacturing is convenient. Alternatively, the second cold plate 102 faces the outside, and the first cold plate 101 faces the battery cell, or may be mounted in reverse, without limitation. Further, the first cold plate 101 and the second cold plate 102 are both formed by punching.

According to the cold plate process requirements, the first cold plate 101 and the second cold plate 102 are welded and connected, and bulges easily occur when the welding area is greater than 30 mm. Optionally, the second cold plate 102 is provided with a reinforcing rib 1011, and the second cold plate 102 may also be provided with an opening 1012, the reinforcing rib 1011 improves the structural strength of the second cold plate 102, and reduces the risk of bulge in the air tightness test after the first cold plate 101 and the second cold plate 102 are combined. The shape and size of the openings 1012 are not limited, and may be adaptively set according to the spatial layout. Specifically, the liquid cooling assembly 100 further includes a sixth flow channel 8, where the sixth flow channel 8 is communicated with the main water inlet, and two ends of the sixth flow channel 8 are respectively connected to the water inlet main flow channel 1. Further, the turbulence structures 1013 are arranged in the sixth flow channel 8, so that the flow uniformity of the cooling liquid in the sixth flow channel 8 is improved, and the cooling liquid is ensured to flow to the two water inlet main flow channels 1 towards the two sides stably and uniformly.

A spacing region is provided between the sixth flow path 8 and the first flow path 3, and the spacing region is provided with reinforcing ribs 1011. A spacer region is provided between the first flow channel 3 and the second flow channel 4, the spacer region being provided with apertures 1012.

The liquid cooling assembly 100 further comprises a water inlet connector 103 and a water outlet connector 104, wherein the water inlet connector 103 is used for connecting a main water inlet and external equipment, and the water outlet connector 104 is used for connecting a main water outlet and external equipment.

A heat conducting glue layer is arranged between the battery cell and the liquid cooling assembly 100, so that the heat conduction effect is ensured. In order to ensure the overall flatness requirement of the liquid cooling assembly 100, the thickness of the heat conducting adhesive layer between the liquid cooling assembly 100 and the battery cell is consistent, so as to ensure heat dissipation uniformity.

As shown in fig. 2, the battery pack further includes a box frame 200, the liquid cooling assembly 100 is disposed at the bottom of the box frame 200, the box frame 200 includes a box outer frame 201 and a beam 202 disposed inside the box outer frame 201, the box outer frame 201 and the liquid cooling assembly 100 form an accommodating space, the battery cell is accommodated in the accommodating space, the beam 202 is used for separating the accommodating space, the box outer frame 201 and the beam 202 are connected with the liquid cooling assembly 100 by adopting an FDS process, and the FDS process is in the prior art and is not described again. In addition, the first cooling plate 101 and the second cooling plate 102 are also provided with mounting holes, and the cross beam 202 is mounted on the liquid cooling assembly 100 through the mounting holes.

The cross beam 202 is arranged between the first flow channel 3 and the second flow channel 4 correspondingly, so that the battery cells are guaranteed to correspond to the first flow channel 3 and the second flow channel 4 respectively, and the cooling effect is improved.

The box frame 200 is further provided with another cross beam 202, and the cross beam 202 is arranged on one side of the first flow channel 3 and on the other side of the main water inlet and the main water outlet, so that the electric core is separated from the water inlet connector 103, the water outlet connector 104, the electric device and the like.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (14)

1. A liquid cooling assembly, comprising:

the water inlet main runner (1) and the water return main runner (2) are communicated with each other, the water inlet main runner (1) and the water return main runner (2) extend along a first direction, the water inlet main runner (1) and the water return main runner (2) are distributed along a second direction, the water inlet main runner (1) is communicated with a main water inlet, the water return main runner (2) is communicated with a main water outlet, and the water inlet main runner (1) is provided with a split water inlet (11);

first runner (3) and second runner (4), along first direction arranges, just main water inlet with main delivery port all is towards first runner (3) set up, first runner (3) with second runner (4) are located intake runner (1) with return water between sprue (2), branch intake (11) with second runner (4) intercommunication, second runner (4) with first runner (3) intercommunication, first runner (3) with return water sprue (2) intercommunication.

2. The liquid cooling assembly according to claim 1, wherein two water inlet main runners (1) are arranged, the water return main runners (2) are located between the two water inlet main runners (1), the two water inlet main runners (1) are communicated with the main water inlet, the two first runners (3) and the two second runners (4) are respectively arranged, and the two first runners (3) and the two second runners (4) are symmetrically arranged on two sides of the water return main runners (2).

3. The liquid cooling assembly according to claim 1, wherein a plurality of second flow channels (4) are arranged along the first direction, the water inlet main flow channel (1) is provided with a plurality of branch water inlets (11) along the first direction, the plurality of branch water inlets (11) are correspondingly communicated with the plurality of second flow channels (4), and the plurality of second flow channels (4) are communicated with the first flow channel (3).

4. A liquid cooling assembly according to claim 3, further comprising a third flow passage (5), wherein the third flow passage (5) is arranged between the second flow passage (4) and the main return water flow passage (2), a plurality of openings are arranged on the side wall of the third flow passage (5) along the first direction, a plurality of the openings are correspondingly communicated with a plurality of the second flow passages (4), and the third flow passage (5) is communicated with the first flow passage (3).

5. The liquid cooling assembly of claim 1, wherein the liquid cooling assembly comprises a liquid cooling chamber,

the first flow channels (3) are arranged in a plurality along the second direction, the first flow channels (3) are communicated with each other, and the first flow channels (3) are communicated with the second flow channels (4); and/or

The second flow channels (4) are arranged in a plurality along the second direction, the second flow channels (4) are mutually communicated, the second flow channels (4) are communicated with the water distribution inlets (11), and the second flow channels (4) are communicated with the first flow channels (3).

6. The liquid cooling assembly of claim 5, wherein the liquid cooling assembly comprises a liquid cooling chamber,

when the liquid cooling assembly is provided with a plurality of first flow channels (3), the liquid cooling assembly further comprises a fourth flow channel (6), a plurality of openings are formed in the side wall of the fourth flow channel (6), the openings are correspondingly communicated with the first flow channels (3), and the fourth flow channel (6) is communicated with the second flow channel (4);

when a plurality of second runners (4) are arranged, the liquid cooling assembly further comprises a fifth runner (7), a plurality of openings are formed in the side wall of the fifth runner (7), the openings are correspondingly communicated with the second runners (4), and the fifth runner (7) is communicated with the split water inlets (11).

7. The liquid cooling assembly according to any one of claims 1-6, comprising a first cold plate (101) and a second cold plate (102), wherein the second cold plate (102) is provided with a groove, wherein the first cold plate (101) is a flat plate, wherein the first cold plate (101) and the second cold plate (102) are connected, and wherein the water inlet main flow channel (1), the water return main flow channel (2), the first flow channel (3) and the second flow channel (4) are formed through the groove.

8. The liquid cooling assembly according to claim 7, wherein the second cold plate (102) faces outward and the first cold plate (101) faces the cell.

9. The liquid cooling assembly according to claim 7, wherein the second cold plate (102) is provided with ribs (1011) and/or openings (1012).

10. The liquid cooling assembly according to any one of claims 1-6, wherein the first flow channel (3) and the second flow channel (4) are both serpentine flow channels.

11. A battery pack comprising a battery cell and the liquid cooling assembly of any one of claims 1-10 for cooling or heating the battery cell.

12. The battery pack of claim 11, wherein a layer of thermally conductive adhesive is disposed between the electrical cell and the liquid cooled assembly.

13. The battery pack according to claim 11 or 12, further comprising a box frame (200), wherein the liquid cooling assembly is disposed at the bottom of the box frame (200), the box frame (200) comprises a box outer frame (201) and a beam (202) disposed inside the box outer frame (201), the box outer frame (201) and the liquid cooling assembly form an accommodating space, the battery cell is accommodated in the accommodating space, the beam (202) is used for separating the accommodating space, and the box outer frame (201) and the beam (202) are both connected with the liquid cooling assembly by adopting an FDS process.

14. The battery pack according to claim 13, wherein the cross member (202) is provided between the first flow passage (3) and the second flow passage (4).