CN113611951A

CN113611951A - Liquid cooling board integrated box and battery box

Info

Publication number: CN113611951A
Application number: CN202110919036.XA
Authority: CN
Inventors: 蔡鹏�; 阎明瀚; 肖鹏; 丁涛; 江吉兵
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-11-05

Abstract

The invention provides a liquid cooling plate integrated box and a battery box, wherein the liquid cooling plate integrated box comprises a box body and a bottom plate, the box body comprises a side plate, a cooling liquid inlet and a cooling liquid outlet, and an accommodating space is formed by the side plate and the bottom plate, and a flow channel from the cooling liquid inlet to the cooling liquid outlet is formed in the box body on the basis of the side plate and the bottom plate. The integrated box body of the liquid cooling plate provided by the invention can be compactly designed so as to reduce the size of the battery box, reduce the overall weight of the box body, reduce the assembly procedures and improve the production and installation efficiency.

Description

Liquid cooling board integrated box and battery box

Technical Field

The invention relates to the technical field of new energy storage battery boxes, in particular to a liquid cooling plate integrated box body and a battery box.

Background

With the development of national economy and increasingly severe requirements on environment, the new energy electric automobile industry is greatly supported to promote the rapid development of the industry. Among them, the power battery is used as a main energy storage component, and needs to pay attention in the design and development of new energy electric vehicles. The power battery can take place certain charge-discharge action in the car use, will be accompanied with the condition that the battery generates heat simultaneously, in order to ensure power battery's comprehensive properties and life, power battery's the heat that produces need in time dispel.

At present, the heat dissipation method for the battery mainly comprises natural cooling, air cooling, liquid cooling and the like, wherein the liquid cooling is mostly adopted in the field of new energy automobiles. The liquid cooling method commonly used at present usually adopts an assembly design of combining a liquid cooling plate and a box body, the structure of assembling the liquid cooling plate and the box body needs to fix the liquid cooling plate in the box body to be assembled, enough space needs to be reserved for placing the liquid cooling plate in the box body to be assembled, fixing the liquid cooling plate in the box body needs to fix fixing parts such as bolts, and a heat conducting pad is further arranged on the upper surface of the liquid cooling plate, so that the assembled parts in the battery box body are more, the quality is heavy, the size is large, the design is not compact, the process is complex when the battery box body is assembled, and the production and installation efficiency is low. On the other hand, for the path of the cooling liquid flow passage of the battery box body in the prior art, the temperature of the whole battery box body rises, the temperature difference in the cooling process is large, and the temperature difference between batteries is further increased along with the increase of the charging and discharging multiplying power and the extension of the working time, so that the whole cycle life, the system capacity and the like are influenced.

Disclosure of Invention

In view of the above problems, the present invention provides a liquid-cooled integrated box and a battery box to improve the above problems.

In a first aspect, the invention provides a liquid cooling plate integrated box, which includes a box body and a bottom plate, wherein the box body includes a side plate forming a receiving space with the bottom plate, a cooling liquid inlet and a cooling liquid outlet, and the box body forms a flow channel from the cooling liquid inlet to the cooling liquid outlet in the box body based on the side plate and the bottom plate.

Preferably, the flow channel comprises a first flow channel which flows through the middle area of the box body and is opposite to the middle area of the box body and a second flow channel which flows through the side area of the box body and is opposite to the side area of the box body, and a flow path of liquid in the flow channel flows in from the cooling liquid inlet and flows through the first flow channel and the second flow channel in sequence to the cooling liquid outlet.

Preferably, the bottom plate includes an upper side and a lower side opposite to the upper side, the lower side is provided with a guide plate arranged along a flow path direction of the liquid in the flow passage, and the guide plate and the bottom plate the side plate form the flow passage.

Preferably, the flow passages are arranged on the bottom plate in an equal width mode.

Preferably, the flow channel is arranged in a reverse-folded manner and comprises at least one first flow channel and a plurality of second flow channels.

Preferably, the cooling liquid inlet and the cooling liquid outlet are arranged at the position, close to the bottom plate, of the side plate.

Preferably, the bottom of the liquid cooling plate integrated box body is provided with a cover plate arranged at an interval with the bottom plate, and the flow channel is formed in the interval between the bottom plate and the cover plate.

Preferably, the cover plate is connected with the integrated liquid cooling plate box in an embedded mode and is flush with the bottom of the side plate of the integrated liquid cooling plate box.

Preferably, the integrated liquid cooling plate box is a rectangular body with an open top, and an upper cover assembled with the integrated liquid cooling plate box is arranged at the top of the integrated liquid cooling plate box.

Preferably, the integrated liquid cooling plate type box body is formed by integral die-casting.

In a second aspect, the present invention also provides a battery box, including: the box upper cover, battery module and as above-mentioned liquid cooling board integrated form box, the box upper cover will battery module encapsulation is in liquid cooling board integrated form box.

The invention has the technical effects that: the invention provides a liquid cooling plate integrated box body, which can be compactly designed by integrating the functions of a liquid cooling plate and the box body into a whole so as to reduce the size of a battery box, reduce the whole weight of the box body, reduce assembly procedures and improve the production and installation efficiency.

According to the invention, the flow channel path is changed to enable the cooling liquid to flow through the middle position of the battery module to be cooled and then flow through the side of the battery module, so that the temperature rise and the temperature difference of the battery box can be reduced.

Drawings

Fig. 1 is a perspective view of an integrated liquid cooling plate case according to an embodiment of the present invention;

FIG. 2 is a perspective view of an integrated liquid cooled plate container in another direction according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is a schematic view of the flow path of the liquid in the flow channel of the integrated coldplate tank according to an embodiment of the present invention;

FIG. 6 is a perspective view of a battery box assembled with a cold plate integrated case according to an embodiment of the present invention;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is an exploded view in another orientation of FIG. 6;

FIG. 9 is a cross-sectional view taken along the line C-C of FIG. 6;

FIG. 10 is a cross-sectional view taken along the direction C-C of the flow channel of FIG. 6 when a liquid is introduced therein;

FIG. 11 is a perspective view of a liquid cooling plate assembled with an assembly case in the prior art;

FIG. 12 is a schematic view of a prior art flow path for a liquid in a flow channel;

fig. 13a to 13c are simulation diagrams respectively corresponding to the maximum temperature difference of the cooling liquid, the battery module and the battery flowing into the flow channel in the flow channel path of the prior art;

fig. 14a to 14c are simulation diagrams respectively corresponding to the maximum temperature difference of the cooling liquid flowing into the flow channel in the flow channel path, the battery module and the battery module provided by the present invention.

Reference numerals:

10. a liquid cooling plate integrated box body; 11. a box body; 111. a side plate; 12. a base plate; 121. an upper side surface; 122. a lower side surface; 13. a coolant inlet; 14. a coolant outlet; 15. a flow channel; 151. a first flow passage; 152. a second flow passage; 16. a baffle; 17. an accommodating space; 18. a groove; 181. a step; 100. a battery box; 20. an upper cover; 30. a battery module; 40. a cover plate; 50. a liquid; 60. a liquid-cooled plate; 70. assembling a box body; 80. a thermally conductive pad.

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.

The invention provides a liquid-cooled integrated box 10, as shown in fig. 1-10, the liquid-cooled integrated box 10 is mainly used for a novel battery box 100, fig. 1 shows a schematic perspective view of a liquid-cooled integrated box in an embodiment of the invention, the liquid-cooled integrated box 10 includes a box body 11 and a bottom plate 12, the box body 11 includes a side plate 111, a cooling liquid inlet 13, and a cooling liquid outlet 14, wherein the bottom plate 12 and the side plate 111 form an accommodating space 17, and the accommodating space 17 can accommodate a battery pack. Fig. 2 is a perspective view showing another direction of the liquid-cooled plate integrated type case in the embodiment of the present invention, and the case body 11 forms the flow passage 15 from the cooling liquid inlet 13 to the cooling liquid outlet 14 in the case based on the side plate 111 and the bottom plate 12. Preferably, the tank body 11 and the bottom plate 12 of the coldplate integrated tank 10 may be integrally formed using a die casting process, a schematic view of the prior art of assembling the coldplate with an assembly tank is shown in fig. 11, the coldplate 60 is fixed in the assembly tank 70 to be assembled, and the upper surface of the coldplate 60 is further provided with a thermal pad 80. Compared with the battery box which is assembled in multiple steps after the box body and the liquid cooling plate are independently produced in the prior art, the integrated box body 10 of the liquid cooling plate provided by the invention does not need to be provided with a fixed supporting structure, a limiting structure and the like of the liquid cooling plate independently when the liquid cooling plate 60 is assembled with the assembling box body 70, and does not need to be provided with a fixed bolt for fixing the liquid cooling plate 60 to the box body. The integrated liquid cooling plate box 10 provided by the invention has the advantages of compact design, reduced number of parts, reduced weight, reduced overall size, reduced assembly procedures and improved production and installation efficiency.

Fig. 3 shows a cross-sectional view along a-a direction in fig. 1, as shown in fig. 1-3, the integrated liquid-cooled plate box 10 in the embodiment of the present invention is a rectangular box with an open top, a bottom plate 12 is disposed at the bottom, four side plates 111 are disposed on the peripheral sides, the four side plates 111 are enclosed to form a rectangle, and a coolant inlet 13 and a coolant outlet 14 are disposed on the side plate 111 on one short side of the rectangle near the bottom plate 12. Preferably, the integrated liquid-cooled plate case 10 and the cover plate 40 are formed of cast aluminum having high thermal conductivity. The bottom plate 12 includes an upper side 121 and a lower side 122 opposite to the upper side 121, and the lower side 122 is provided with the baffle plates 16 arranged along the flow path direction of the liquid in the flow passage 15.

Fig. 4 shows an enlarged view of B in fig. 3, as shown in fig. 1 to 4, a receiving space 17 is formed between the box body 11 and the bottom plate 12 at one side of the bottom plate 12, a groove 18 is formed at the other side, the baffle 16 is disposed in the groove 18, and a step 181 is further disposed along the circumferential side of the inner side surface of the groove 18.

Fig. 5 is a schematic diagram showing the flow path of the liquid in the flow channel of the integrated liquid-cooled plate box according to an embodiment of the present invention, the flow path of the liquid is shown by the dashed arrows in fig. 5, the flow channel 15 is formed by the flow guide plate 16, the bottom plate 12 and the side plate 111, and the cover plate 40 is spaced from the lower side 122 of the bottom plate 12 to enclose the flow channel 15. As shown in fig. 4-5, the liquid can be introduced into the flow channels 15 through the cooling liquid inlet 13, and the flow channels 15 pass through the flow paths formed by the flow guide plates 16, the side plates 111 and the bottom plate 12, so that the liquid flows through each flow channel along the flow path and then flows out through the cooling liquid outlet 14. The height of the guide plate 16 is lower than the height of the side edge of the groove 18, and the height of the guide plate 16 is equal to that of the step 181, so that when the cover plate 40 is assembled with the box body 11 and is embedded into the box body 11, the cover plate 40 is abutted against the end portions of the step 181 and the guide plate 16, and the cover plate 40 is embedded into and connected to the liquid cooling plate integrated box body 10 and is flush with the bottom of the side plate 111 of the liquid cooling plate integrated box body 10, so that the whole thickness of the battery box 100 is reduced.

Preferably, the baffles 16 are disposed on the lower side 122 at equal intervals, so that the flow channels 15 are folded and arranged with equal width to uniformly distribute the flow of the liquid in the flow channels 15, wherein the flow channels 15 include at least one first flow channel 151 and a plurality of second flow channels 152. In other embodiments, the baffle 16 may also be disposed on the upper side 121, in which case the cover plate 40 would be spaced from the upper side 121.

Figure 6 shows a perspective view of a battery box assembled by a cold plate integrated case according to an embodiment of the present invention, figures 7-8 illustrate exploded views in different directions of a battery case assembled with a cold plate integrated case according to an embodiment of the present invention, figure 9 shows a cross-sectional view of the assembled battery case of the cold plate integrated case of one embodiment of the present invention taken along the direction C-C in figure 6, as shown in fig. 6-9 in conjunction with fig. 1-3, the battery module 30 is accommodated in the accommodating space 17 of the integrated liquid-cooled plate case 10, the flow channel 15 includes a first flow channel 151 passing through a position opposite to a middle region of the battery module 30 and a second flow channel 152 passing through a position opposite to a side region of the battery module 30, and a flow path of the liquid in the flow channel 15 is from the cooling liquid inlet 13 to the cooling liquid outlet 14 via the first flow channel 151 and the second flow channel 152 in sequence. Fig. 12 shows a schematic diagram of a flow path of liquid in a flow channel in the prior art, the flow path of the liquid in the flow channel in the prior art is shown by a dotted arrow in fig. 12, a flow channel 15 in the prior art firstly passes through the side of a battery module 30 and then passes through the flow channel path at the middle position of the battery module 30, because the cooling liquid flows into the flow channel entering a liquid cooling plate from a cooling liquid inlet 13 and sequentially passes through each flow channel, the temperature of the cooling liquid is increased after the cooling liquid has absorbed some heat by part of the flow channel before flowing into the flow channel at the opposite position of the battery module, the capability of convective heat transfer of the cooling liquid is reduced when the cooling liquid flows to the opposite position of the battery module, but the heat at the middle position of the battery module is higher than the temperature at the periphery, and the problems of large temperature difference, high temperature rise and the like of the battery are caused. The flow channel path according to the present invention first flows through the middle of the battery module 30 to be cooled, and then flows through the side of the battery module 30, as shown in fig. 5, the battery corresponding to the position with a higher temperature in the middle of the battery module can be preferentially cooled, and then the battery on the side can be cooled, so as to reduce the overall temperature rise and the temperature difference during the cooling process, and solve the problems of large temperature difference and high temperature rise of the battery caused by the conventional flow channel path. Fig. 13a to 13c show simulation diagrams corresponding to a cell temperature cloud chart, a cell horizontal cross-section temperature cloud chart, and a coolant temperature cloud chart, respectively, provided in the prior art before optimization. Simulation graphs corresponding to the cell temperature cloud chart, the cell horizontal section temperature cloud chart and the cooling liquid temperature cloud chart of the liquid cooling plate integrated box body optimized by the method are shown in fig. 14a-14 c.

The temperature difference data before and after optimization are shown in tables 1 and 2:

TABLE 1

TABLE 2

As can be seen from the above table, the maximum temperature difference of the cell provided by the prior art is 16.31 ℃, and the maximum temperature difference of the horizontal cross section of the cell is 3.44 ℃. The maximum temperature difference of the battery core is 14.51 ℃, and the maximum temperature difference of the horizontal section of the battery core is 2.25 ℃. And the maximum temperature of the optimized battery cell is reduced by 0.38 ℃, and the minimum temperature is relatively increased by 1.42 ℃. The temperature difference of the horizontal section of the battery cell is reduced by 1.19 ℃, and the relative reduction amplitude is 34.6%. The reduction in temperature difference helps to extend the life of the battery.

The bottom of the integrated liquid cooling plate box 10 is provided with a cover plate 40 spaced from the bottom plate 12, and the flow channel 15 is formed in the space between the bottom plate 12 and the cover plate 40. Preferably, the integrated liquid-cooled plate box 10 is a rectangular body with an open top, the top of the integrated liquid-cooled plate box 10 is provided with an upper cover 20 which is assembled with the integrated liquid-cooled plate box 10 in a matching manner, and the upper cover 20, the integrated liquid-cooled plate box 10, the battery module 30 and the cover plate 40 are assembled together to form the battery box 100. Namely, the upper case cover 10 encapsulates the battery module 30 in the integrated liquid-cooled plate case 10, and the battery module 30 can be accommodated in the accommodating space 17 by the integrated liquid-cooled plate case 10.

When the battery box 100 needs to dissipate heat during operation, the liquid 50 flows through the flow channel 15 in the cold plate integrated type box 10 and flows in through the cooling liquid inlet 13, and flows out through the cooling liquid outlet 14 along the flow channel 15, and the cross-sectional view of the liquid 50 for flowing into the flow channel 15 is shown in fig. 10, and the liquid 50 may be a mixed solution of ethylene glycol and water.

In summary, the present invention provides a liquid cooling plate integrated type case 10, which integrates the functions of the liquid cooling plate with the case, so that the liquid cooling plate integrated type case 10 can be designed compactly to reduce the size of the battery case 100, reduce the overall weight of the case, reduce the assembly process, and improve the efficiency of production and installation; by the path design of the flow channel, the temperature rise and the temperature difference of the battery case 100 can be reduced.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions.

Claims

1. The liquid cooling plate integrated box body is characterized by comprising a box body and a bottom plate, wherein the box body comprises a side plate, a cooling liquid inlet and a cooling liquid outlet, the side plate and the bottom plate form a containing space, and the box body is formed in the box body on the basis of the side plate and the bottom plate and is provided with a flow channel from the cooling liquid inlet to the cooling liquid outlet.

2. The integrated coldplate cassette of claim 1, wherein the flow channels comprise a first flow channel passing through the middle region of the cassette body opposite to the first flow channel and a second flow channel passing through the side region of the cassette body opposite to the second flow channel, and the flow path of the liquid in the flow channels is from the coolant inlet to the coolant outlet.

3. The integrated coldplate tank as claimed in claim 1, wherein the base plate includes an upper side and a lower side opposite the upper side, the lower side being provided with baffles arranged along a flow path of the liquid in the flow channel, and the baffles forming the flow channel with the base plate and the side plates.

4. The integrated coldplate cassette of claim 1, wherein the flow channels are of equal width in the base plate.

5. The integrated coldplate cassette of claim 2, wherein the flow passages are folded back and include at least a first flow passage and a plurality of second flow passages.

6. The integrated coldplate cassette of claim 1, wherein the coolant inlet and the coolant outlet are open to the side plates adjacent to the bottom plate.

7. The integrated liquid-cooled plate tank of claim 3, wherein a cover plate is disposed at a distance from the bottom plate, and the flow channel is formed in the distance between the bottom plate and the cover plate.

8. The integrated coldplate tank of claim 6, wherein the cover plate is flush with the integrated coldplate tank and flush with the bottom of the side plate of the integrated coldplate tank.

9. The integrated liquid-cooled plate box of claim 1, wherein the integrated liquid-cooled plate box is a rectangular body with an open top, and an upper cover is disposed on the top of the integrated liquid-cooled plate box and is assembled with the integrated liquid-cooled plate box in a matching manner.

10. The integrated coldplate cabinet of claim 1, wherein the integrated coldplate cabinet is integrally die cast.

11. A battery box, comprising: the integrated liquid-cooled plate case of any one of claims 1 to 10, and a battery module enclosed therein.