CN113451679A

CN113451679A - Cooling system

Info

Publication number: CN113451679A
Application number: CN202010233540.XA
Authority: CN
Inventors: 廖正远; 曾毅; 郑卫鑫
Original assignee: BYD Co Ltd
Current assignee: Shaoxing Fudi Battery Co ltd; BYD Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-09-28
Anticipated expiration: 2040-03-27
Also published as: CN113451679B

Abstract

The invention relates to a cooling system acting on a battery module of an electric vehicle. The battery module includes a first outer surface and a second outer surface arranged oppositely and a first end and a second end arranged oppositely. The cooling system includes a first cooling plate and two second cooling plates. The first cooling plate is attached to the first outer surface, and the first cooling plate is further provided with a water inlet and a first flow channel. The two second cooling plates are attached to the second outer surface, and the two second cooling plates are arranged on both sides of the first cooling plate, and each of the second cooling plates is There is a second flow channel. The first flow channels are respectively communicated with the two second flow channels, and the first flow channels and the second flow channels are both straight flow channels without bending inside. After passing through the water inlet, the cooling liquid passes through the first flow channel and the second flow channel successively to cool the battery module. The cooling system of the present invention cools the battery module more uniformly and has a better cooling effect.

Description

Cooling system

Technical Field

The invention relates to the field of new energy automobiles, in particular to a cooling system of a battery module.

Background

An electric vehicle is in a high-speed development stage as a new energy vehicle. The electric vehicle mainly provides advancing power by the battery module. A large-sized battery module needs to be equipped with a complete cooling system to solve the heat generation problem. A prior art cooling system can be seen in the schematic of fig. 1, 2 and 3. The cooling plate 10a is disposed on the bottom surface 21a of the tray 20a, and when the battery module 200a is received in the tray 20a, the cooling plate 10a at the bottom surface 21a contacts the battery module 200a to cool the battery module 200 a.

Further, the cooling plate 10a is provided therein with a flow channel 30a bent several times, and the cooling liquid is bent several times along with the flow channel 30a to cover the outer surface area of the battery module 200a, so as to achieve a better cooling effect. However, since there are many 180-degree turns in the flow channel 30a, a large flow resistance is caused in the cooling plate 10a, which affects the cooling effect. Also, the arrangement of the flow channels 30a may cause uneven cooling between the battery modules 200a in contact with the front and rear of the tray 20a, resulting in a large temperature difference.

Disclosure of Invention

The invention provides a cooling system with uniform cooling, which can realize more uniform cooling of a battery module and better cooling effect. The technical scheme is as follows:

a cooling system for a battery module including first and second oppositely disposed outer surfaces and first and second oppositely disposed ends, the cooling system comprising:

the first cooling plate is attached to the first outer surface, a water inlet is formed in the position, close to the first end, of the first cooling plate, the water inlet is communicated to a first flow channel, used for flowing cooling liquid, in the first cooling plate, and the first flow channel is a linear flow channel;

two second cooling plates, all laminate in the second surface, and two the second cooling plate is in projection branch on the first surface is listed as the both sides of first cooling plate, the second cooling plate is close to first end department is equipped with out water structure, every all be equipped with the second runner that is used for circulating the coolant liquid in the second cooling plate, just the second runner with first runner is being close to second end department intercommunication, the second runner also is sharp runner.

The cooling system further comprises a transfer pipe, the transfer pipe is arranged close to the second end and connected between the first cooling plate and the second cooling plate, and the transfer pipe is used for communicating the first flow channel with the second flow channel.

The first flow channel is internally provided with a plurality of bulges, each bulge extends along the direction from the first end to the second end, and the bulges are used for separating the first flow channel.

The first cooling plate is provided with a first water passing hole communicated to the first flow channel at a position close to the second end, and the first water passing hole is matched with the adapter tube to realize communication between the first flow channel and the adapter tube.

Wherein, in the width direction of the first cooling plate, the water inlet is arranged in the middle of the first cooling plate, and the two first water through holes are respectively arranged at two sides of the water inlet.

The second flow channel comprises a plurality of second sub-flow channels, and the second sub-flow channels are communicated with the adapter tube.

And a second water passing hole communicated to the second flow channel is formed in the position, close to the second end, of the second cooling plate, and the second water passing hole is matched with the adapter pipe to realize communication between the second flow channel and the adapter pipe.

The cooling system further comprises a water outlet structure, the water outlet structure is arranged at the position, close to the first end, of the second cooling plate, and the water outlet structure is communicated with the two second flow channels.

The water outlet structure comprises a flow guide pipe and a water outlet, the flow guide pipe is simultaneously communicated with the two second flow passages, and the water outlet is communicated with the flow guide pipe.

Wherein the first cooling plate is further configured as a bottom plate of a tray for receiving the battery modules, and the cooling system of the present invention inputs the cooling liquid to the first flow channel and the second flow channel through the water inlet such that the first cooling plate and the second cooling plate can cool the battery modules from the first outer surface and the second outer surface. Further, the first flow channel and the second flow channel are both linear flow channels, the flow direction of the cooling liquid is reversed only once when the cooling liquid flows from the first flow channel to the second flow channel, and the heat of the first cooling plate is not directly conducted to the second cooling plate, so that a more uniform cooling effect is obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below.

FIG. 1 is a schematic diagram of a prior art cooling system;

FIG. 2 is an exploded schematic view of a prior art cooling system;

FIG. 3 is a schematic view of a coolant flow path in a prior art cooling system;

FIG. 4 is a schematic view of the cooling system of the present invention;

FIG. 5 is an exploded schematic view of the cooling system of the present invention;

fig. 6 is a schematic plan view of a first outer surface of a battery module in the cooling system according to the present invention;

FIG. 7 is a schematic illustration of an internal cross-section of a first cooling plate in the cooling system of the present invention;

FIG. 8 is a schematic illustration of an internal cross-section of a second cooling plate in the cooling system of the present invention;

FIG. 9 is a schematic view of a transfer tube in the cooling system of the present invention;

FIG. 10 is another schematic cross-sectional view of a second cooling plate in the cooling system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 4 and 5, the cooling system 100 of the present invention is applied to a battery module 200 of an electric vehicle. In the present embodiment, the battery module 200 includes a first outer surface 210 and a second outer surface 220 disposed opposite to each other, wherein the battery module 200 further includes a first end 201 and a second end 202 disposed opposite to each other. In the illustration of fig. 4 and 5, the battery module 200 has a rectangular parallelepiped structure, and the first outer surface 210 and the second outer surface 220 thereof may be regarded as two outer surfaces that are oppositely disposed in the thickness direction of the battery module 200. The first end 201 and the second end 202 are oppositely disposed in the length direction of the battery module 200. Therefore, the bonding area between the cooling system 100 and the battery module 200 is larger, and a better cooling effect is realized.

The cooling system 100 includes a first cooling plate 10 and a second cooling plate 20, wherein the first cooling plate 10 is attached to the first outer surface 210, and the second cooling plate 20 is attached to the second outer surface 220. Please refer to fig. 6 synchronously, wherein the first cooling plate 10 has a first projection 211 on the first outer surface 210, the number of the second cooling plates 20 is two, two second cooling plates 20 are respectively attached to two opposite sides of the second outer surface 220, two second projections 212 are provided on the first outer surface 210, and the two second projections 212 are arranged on two opposite sides of the first projection 211. Thus, the first cooling plate 10 may cool the battery module 200 at the middle region of the first outer surface 210, and the two second cooling plates 20 may cool the battery module 200 at both side regions of the second outer surface 220.

Further, referring to fig. 7, a first flow channel 11 and a water inlet 12 communicated with the first flow channel 11 are disposed inside the first cooling plate 10, the water inlet 12 is disposed near the first end 201, and the cooling liquid flows into the first flow channel 11 from the water inlet 12. Referring to fig. 8, a second flow channel 21 is further disposed in the second cooling plate 20, and the first flow channel 11 is communicated with the second flow channel 21 at a position close to the second end 202. And the first flow channel 11 and the second flow channel 21 are both straight flow channels, after the cooling liquid enters the first flow channel 11 from the water inlet 12, the cooling liquid can directly flow to the position of the second end 202 under the condition that the flow direction is not changed, and the cooling liquid is divided into two paths to respectively enter the second flow channel 21 through only one flow direction conversion at the second end 202, and then flows to the position of the first section 201 again under the condition that the flow direction is not changed.

Thus, the cooling fluid in the cooling system 100 of the present application performs a cooling function for the battery module 200 by only one flow direction transition. Such a structure shortens the flow path of the cooling liquid, reduces the flow resistance, and makes the temperature difference of the cooling liquid between the first cooling plate 10 and the second cooling plate 20 relatively small. Furthermore, because the first cooling plate 10 and the second cooling plate 20 are respectively disposed at different outer surface positions of the battery module 200, the temperature of the first cooling plate 10 is not directly transferred to the second cooling plate 20, and the phenomenon of uneven cooling due to too large front-rear temperature difference caused by too long flow path of the cooling liquid is further avoided. Therefore, the cooling system 100 of the present application, due to the above structure, cools the battery module 200 more uniformly, and achieves a better cooling effect.

In the illustrated embodiment, the cooling system 100 further comprises an adapter tube 3 and a water outlet structure 40. The adapter tube 30 is disposed near the second end 202 for communicating the first flow passage 11 with the second flow passage 21. The water outlet structure 40 is disposed at a position of the second cooling plate 20 near the first end 201, and the water outlet structure 40 is also communicated with the second flow channel 21 for flowing the cooling liquid out of the cooling system 100 of the present application. Thus, the cooling fluid flowing into the cooling system 100 of the present application can flow into the first flow channel 11 from the water inlet 12 at the first end 201, then flow through the first flow channel 11 to the adapter tube 30 at the second end 202, flow into the second flow channel 21 from the adapter tube 30, and finally flow into the water outlet structure 40 near the first end 201 from the second flow channel 21, thereby completing the cooling cycle in the cooling system 100 of the present application.

As can be appreciated, since the first cooling plate 10 is attached to the first outer surface 210, the cooling liquid can cool the corresponding region of the first outer surface 210 when flowing through the first flow channel 11; accordingly, the coolant can also cool the region of the second outer surface 220 corresponding to the second cooling plate 20 when flowing through the second flow channel 21. Further, the second cooling plates 20 are distributed on two opposite sides of the first cooling plate 10 in the projection direction of the battery module 200, so that the second cooling plates 20 can act on two end cell positions of the battery module 200. The electric core at battery module 200 both ends belongs to the great position of battery module 200 calorific capacity more, and this application cooling system 100 acts on two electric core position departments respectively through two second cooling plates 20, can promote the cooling effect of battery module 200 electric core position department to corresponding difference in temperature between the electric core of both ends that has reduced.

Referring back to fig. 6, in order to improve the cooling effect of the cooling system 100 of the present application, the following embodiments may also be adopted for the arrangement of the first projection 211 and the second projection 212: the sum of the area of the first projection 211 and the area of the two second projections 212 is set to be greater than or equal to the area of the first outer surface 210. Since the battery module 200 has a substantially rectangular parallelepiped shape, the areas of the first and second

outer surfaces

210 and 220 are substantially the same. And the sum of the projection area of the first cooling plate 10 at the first outer surface 210 and the projection areas of the two second cooling plates 20 at the first outer surface 210 is greater than or equal to the area of the first outer surface 210, so that the cooling system 100 can completely cover the projection area of the battery module 200 corresponding to the first outer surface 210, and a better cooling effect is achieved.

On the other hand, it may also be provided that the sum of the areas of the two second projections 212 is greater than or equal to the area of the first projection 211. That is, the two second projections 212 located on opposite sides of the first projection 211 are close to the sides of the first projection 211, are at least flush with the first projection 211 on the first outer surface 210, or partially extend into the area of the first projection 211. Such an arrangement further ensures complete coverage of the projected areas of the battery module 200 corresponding to the first outer surface 210 by the first cooling plate 10 and the two second cooling plates 20. Further, when the sum of the projected areas of the two second cooling plates 20 on the battery module 200 is greater than or equal to the projected area of the first cooling plate 10 on the battery module 200, it can be ensured that the flow rates of the two second flow channels 21 are matched with the flow rate of the first flow channel 11, and the overall flow rate of the cooling liquid in the cooling system 100 of the present application is more uniform.

In one embodiment, two second cooling plates 20 are provided having the same shape. I.e. the area of the two second projections 212 is also the same. In this way, the cross-sectional areas of the second flow channels 21 in the two second cooling plates 20 are also the same, and the cooling liquid can be uniformly dispersed into the two second flow channels 21 from the first flow channel 11, so that the cooling effect of the two second cooling plates 20 on the two sides of the battery module 200 is kept the same.

In one embodiment, the battery module 200 is further accommodated in the tray 300. The tray 300 is used to accommodate the battery module 200 and to fix the battery module 200 with respect to the electric vehicle. The tray 300 further includes a bottom plate 301 and side plates 302. The side plate 302 is arranged around the bottom plate 301. In the present embodiment, the first cooling plate 10 is also configured as a part of the bottom plate 301, or described as the first cooling plate 10 serving to form a part of the bottom plate 301 of the tray 300 while performing a cooling function. The first cooling plate 10 is integrated at the bottom of the tray 300 to form a part of the bottom plate 301 of the tray 300, so that the volume of the cooling system 100 of the present application can be reduced, the overall thickness of the battery module 200 can be reduced, and the internal structure of the electric vehicle can be more compact. Meanwhile, the overall structural rigidity of the tray 300 is better, and the structural stability of the first cooling plate 10 can also be improved.

In an embodiment, since the battery module 200, the first cooling plate 10 and the second cooling plate 20 are rigid bodies, when the first cooling plate 10 is attached to the first outer surface 210, in order to ensure that the first cooling plate 10 can be better attached to the first outer surface 210, a heat-conducting structural adhesive (not shown) may be further disposed between the first cooling plate 10 and the first outer surface 210. The heat conductive structural adhesive is filled between the first cooling plate 10 and the first outer surface 210, and is used for bonding the first cooling plate 10 and the first outer surface 210, and preventing a gap from occurring between the first cooling plate 10 and the first outer surface 210. Meanwhile, the heat-conducting structural adhesive also has higher heat-conducting capacity, can effectively transfer the heat accumulated on the first outer surface 210 to the first cooling plate 10, and improves the cooling effect of the first cooling plate 10 on the first outer surface 210. It is understood that the heat conductive structural adhesive may also be disposed between the second cooling plate 20 and the second outer surface 220, and also used to enhance the cooling effect of the second cooling plate 20 on the second outer surface 220.

In the illustration of fig. 7, a plurality of protrusions 111 are disposed in the first flow channel 11, and each protrusion 111 extends along a direction from the first end 201 to the second end 202. The plurality of protrusions 111 serve to partition the first flow channel 11 so that the cooling liquid can uniformly flow through the first flow channel 11. Meanwhile, the plurality of protrusions 111 are further provided with gaps at positions close to the first end 201 and the second end 202, so that the cooling liquid can flow into the first flow channels 11 separated by the plurality of protrusions 111 after flowing into the first flow channels 11 from the water inlet 12, and the cooling liquid can be converged at the second end 202 to flow into the adapter tube 30 after flowing through the plurality of protrusions 111.

In one embodiment, the first cooling plate 10 is further provided with a first water through hole 13 near the second end 202 and connected to the first flow channel 11, and the first water through hole 13 is matched with the adapter tube 30 to send the cooling liquid in the first flow channel 11 into the adapter tube 30. Or as the adapter tube 30 is in communication with the first flow passage 11 through the first water passage hole 13. In the schematic of fig. 7, the water inlet 12 is located in the middle of the first cooling plate 10 in the width direction of the first cooling plate 10, and two first water through holes 13 are arranged on both sides of the water inlet 12 to match the positions of the two second cooling plates 20. The number of the adapter tubes 30 is also two, and each adapter tube 30 is communicated between one first water through hole 13 and one second cooling plate 20. In other embodiments, only one first water through hole 13 may be provided, and the adapter tube 30 may be a T-shaped three-way pipeline to achieve the effect of flowing the cooling liquid from the first flow channel 11 into the second flow channels 21 on both sides.

It is understood that the second cooling plate 20 is also provided with a second water through hole 23 (see fig. 8) for connecting the adapter tube 30, and the second water through hole 23 is also communicated to the second flow passage 21. Referring to fig. 9, for the adapting tube 30, the two end joints 31 can be implemented as quick joints, so that the adapting tube 30 can be quickly connected between the first cooling plate 10 and the second cooling plate 20.

Referring to fig. 8, the second flow channel 21 further includes a plurality of second sub-flow channels 211, and the plurality of second sub-flow channels 211 are all communicated with the second water through holes 23, so that the cooling liquid flowing in from the adapter tube 30 can enter each of the second sub-flow channels 211 to cool the corresponding area of the second outer surface 220. The second sub-channels 211 are also all communicated with the water outlet structure 40. The plurality of second sub-flow passages 211 enable the cooling liquid in the second flow passages 21 to flow uniformly, ensuring the cooling effect of the second cooling plate 20, similarly to the function of the plurality of protrusions 111 in the first flow passage 11.

Further, referring to fig. 10, on any cross section perpendicular to the extending direction of the second sub flow channel 211, the second sub flow channel 211 is disposed in a flat shape, and a wider side of the cross section is disposed in parallel to the direction of the second outer surface 220. The arrangement enables the cooling liquid in each second sub-flow passage 211 to form a larger acting area with the second outer surface 220, so that the whole second flow passage 21 can form a larger acting area with the second outer surface 220, and the cooling effect of the second cooling plate 20 is improved.

The water outlet structure 40 is disposed near the first end 201 of the battery module 200. As shown in fig. 5, the water outlet structure 40 includes a flow guide tube 41 and a water outlet 42, the flow guide tube 41 is used for simultaneously communicating the two second flow channels 21, and the water outlet 42 is located on the flow guide tube 41 and is communicated with the flow guide tube 41. The cooling liquid flowing through the two second flow channels 21 can flow to the water outlet 42 through the flow guide pipe 41, and flows out from the water outlet 42 after completing one complete cooling cycle. It can be understood that the water outlet 42 may be disposed at the middle position of the flow guide pipe 41, and the position of the water outlet 42 corresponds to the position of the water inlet 12 in the first cooling plate 10, so that the water inlet 12 and the water outlet 42 of the cooling system 100 of the present application can be close to each other, and the arrangement of the coolant pipeline of the electric vehicle is facilitated.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. A cooling system for a battery module, the battery module comprising a first outer surface and a second outer surface arranged oppositely and a first end and a second end arranged oppositely, characterized in that the cooling The system includes:

The first cooling plate is attached to the first outer surface, the first cooling plate is provided with a water inlet near the first end, and the water inlet is connected to the first cooling plate for circulation cooling a first flow channel of the liquid, and the first flow channel is a linear flow channel;

Two second cooling plates are attached to the second outer surface, and the projections of the two second cooling plates on the first outer surface are arranged on both sides of the first cooling plate, so The second cooling plate is provided with a water outlet structure near the first end, and each second cooling plate is provided with a second flow channel for circulating cooling liquid, and the second flow channel is connected to the first end. A flow channel communicates near the second end, which is also a straight flow channel.

2 . The cooling system according to claim 1 , wherein the cooling system further comprises an adapter pipe, the adapter pipe is disposed near the second end and connected to the first cooling plate and the second cooling plate. 3 . Between the cooling plates, the transfer pipe is used to communicate the first flow channel and the second flow channel.

3 . The cooling system according to claim 2 , wherein a plurality of protrusions are provided in the first flow channel, and each protrusion extends along the direction from the first end to the second end, 3 . A plurality of the protrusions are used to separate the first flow channels.

4 . The cooling system according to claim 2 , wherein the first cooling plate is provided with a first water passage connected to the first flow passage near the second end, and the first water passage is 5 . The water hole cooperates with the adapter pipe to realize the communication between the first flow channel and the adapter pipe.

5 . The cooling system according to claim 4 , wherein, in the width direction of the first cooling plate, the water inlet is provided in the middle of the first cooling plate, and two of the first cooling plates are located in the middle of the first cooling plate. 6 . The water holes are arranged on both sides of the water inlet.

6 . The cooling system according to claim 2 , wherein the second flow channel comprises a plurality of second sub-flow channels, and the plurality of second sub-flow channels are all communicated with the transfer pipe. 7 .

7 . The cooling system according to claim 6 , wherein the second cooling plate is provided with a second water-passing hole connected to the second flow channel near the second end. The water passage hole cooperates with the adapter pipe to realize the communication between the second flow channel and the adapter pipe.

8 . The cooling system according to claim 6 , wherein the cooling system further comprises a water outlet structure, the water outlet structure is disposed near the first end of the second cooling plate, and the water outlet structure is the same as the first end. 9 . Both of the second flow channels are in communication.

9 . The cooling system according to claim 8 , wherein the water outlet structure comprises a guide pipe and a water outlet, the guide pipe is connected to the two second flow channels at the same time, and the water outlet is connected to the the guide tube.

10. The cooling system according to any one of claims 1-9, wherein the first cooling plate is further configured as a bottom plate for accommodating a tray of the battery module.