Liquid cooling energy storage box

Abstract

The utility model discloses a liquid cooling energy storage box which comprises a battery module, a frame surrounding the periphery of the battery module, and a liquid cooling plate fixed at the bottom of the frame and used for bearing the battery module, the liquid cooling plate comprises a uniform temperature plate for supporting a battery module, a flow channel plate which is positioned below the uniform temperature plate and is in welded connection with the uniform temperature plate, and a liquid cooling flow channel formed between the uniform temperature plate and the flow channel plate. According to the liquid cooling energy storage box in the embodiment of the utility model, the liquid cooling flow channel is formed on the flow channel plate and is sealed by the uniform temperature plate, so that the leakage of the cooling liquid can be prevented, the thickness of the liquid cooling plate is reduced, and the heat dissipation efficiency of the liquid cooling plate on the battery module is improved through the design of the sub-flow channel.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage boxes, and in particular relates to a liquid-cooled energy storage box. Background Art

[0002] In recent years, with the continuous improvement of battery module energy density and output power, there are higher requirements for the heat dissipation efficiency of battery modules. At present, most battery modules are placed in dedicated energy storage boxes, and liquid cooling plates are set in the energy storage boxes to assist in heat dissipation of the battery modules. However, the current energy storage boxes have the following disadvantages:

[0003] 1. A flow channel for the coolant to flow needs to be set inside the liquid cooling plate, which makes the existing liquid cooling plate thicker and reduces the volume energy density of the battery module;

[0004] 2. The sealing of the liquid cooling plate is poor, and the coolant is prone to leakage. In addition, most liquid cooling plates also need to support the battery module. The sealing of the liquid cooling plate will be further reduced after being under pressure for a long time.

[0005] 3. The flow channel design in the liquid cooling plate is unreasonable, which affects the heat exchange efficiency of the coolant in the flow channel.

[0006] Therefore, in view of the above technical problems, it is necessary to provide a liquid-cooled energy storage box.

[0007] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0008] The utility model aims to provide a liquid-cooled energy storage box, which can improve the volume utilization and heat dissipation efficiency of the liquid-cooled energy storage box.

[0009] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0010] A liquid-cooled energy storage box, the liquid-cooled energy storage box comprising a battery module, a frame surrounding the battery module, a liquid cooling plate fixed to the bottom of the frame and carrying the battery module, the liquid cooling plate comprising a temperature averaging plate supporting the battery module, a flow channel plate located below the temperature averaging plate and welded to the temperature averaging plate, and a liquid cooling flow channel formed between the temperature averaging plate and the flow channel plate.

[0011] In one or more embodiments of the present invention, the edge of the temperature homogenizing plate is fixed to the frame by friction welding.

[0012] In one or more embodiments of the present utility model, a liquid inlet pipe and a liquid outlet pipe are provided on the liquid cooling plate, the liquid cooling flow channel includes a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid inlet pipe, the liquid outlet is connected to the liquid outlet pipe, and the liquid cooling flow channel includes a main channel and one or more branch channels connected to the main channel.

[0013] In one or more embodiments of the present invention, the liquid cooling channel is formed on the channel plate and sealed by welding the channel plate and the temperature balancing plate, and the liquid inlet pipe and the liquid outlet pipe are both arranged on the temperature balancing plate.

[0014] In one or more embodiments of the present invention, a plurality of branch flow channels are connected in parallel to the main flow channel.

[0015] In one or more embodiments of the present utility model, the main channel includes a first main channel, a second main channel and a third main channel, the first end of the first main channel is connected to the liquid inlet, the second end of the third main channel is connected to the liquid outlet, and the first end and the second end of the second main channel are respectively connected to the second end of the first main channel and the first end of the third main channel.

[0016] In one or more embodiments of the present invention, the flow channel plate includes a first bottom plate distributed along the circumferential direction and a first top plate protruding above the first bottom plate, and the liquid cooling flow channel is arranged on the first top plate and is recessed in a direction away from the temperature equalizing plate.

[0017] In one or more embodiments of the present invention, the depth of the liquid-cooling channel is less than or equal to the distance between the first bottom plate and the first top plate.

[0018] In one or more embodiments of the present invention, the temperature equalizing plate includes a second bottom plate distributed along the circumferential direction and a second top plate protruding above the second bottom plate, and the first bottom plate and the second bottom plate are sealed and fixed.

[0019] In one or more embodiments of the present invention, the frame includes a first frame body and a second frame body arranged parallel to each other, and a plurality of support plates located below the liquid cooling plate, and both ends of the support plates are fixedly mounted on the bottom of the first frame body and the second frame body respectively.

[0020] Compared with the prior art, the liquid-cooled energy storage box of the utility model can not only prevent leakage of coolant, but also greatly reduce the thickness of the traditional liquid cooling plate by forming a liquid cooling channel on the channel plate and sealing it with a temperature equalizing plate. By connecting the edge of the temperature equalizing plate with the frame, the overall height of the liquid-cooled energy storage box is reduced, and the volume utilization rate of the liquid-cooled energy storage box is improved. The design of the diversion channel effectively improves the uniformity of the coolant flow rate and improves the heat dissipation efficiency of the liquid cooling plate to the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a liquid-cooled energy storage box in one embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the explosion structure of a liquid-cooled energy storage box in one embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the explosion structure of the liquid cooling plate in one embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the planar structure of the flow channel plate in one embodiment of the utility model;

[0026] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0027] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0028] Figure 7 for Figure 4 A partial enlarged view of point C in the middle;

[0029] Figure 8 It is a side structural schematic diagram of a liquid-cooled energy storage box in one embodiment of the utility model;

[0030] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle.

[0031] Explanation of main figure marks: 1. frame, 11. first frame, 111. first mounting plate, 12. second frame, 121. second mounting plate, 13. third frame, 14. fourth frame, 15. support plate, 2. liquid cooling plate, 21. flow channel plate, 211. first bottom plate, 212. first top plate, 22. temperature uniformity plate, 221. second bottom plate, 222. second top plate, 3. liquid cooling flow channel, 31. main flow channel, 311. first main flow channel, 312. second main flow channel, 313. third main flow channel, 32. branch flow channel, 321. first branch flow channel, 322. second branch flow channel, 323. third branch flow channel, 4. liquid inlet pipe, 5. liquid outlet pipe. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] Ginseng Figure 1 , Figure 2 The figure shows a liquid-cooled energy storage box in an embodiment of the utility model, including a battery module, a frame 1 surrounding the battery module, a liquid cooling plate 2 fixed to the bottom of the frame 1 and carrying the battery module, the liquid cooling plate 2 includes a temperature averaging plate 22 supporting the battery module, a flow channel plate 21 located below the temperature averaging plate 22 and welded to the temperature averaging plate 22, and a liquid cooling flow channel 3 formed between the temperature averaging plate 22 and the flow channel plate 21.

[0034] In this embodiment, the battery module placed on the liquid cooling plate 2 can be cooled by the liquid cooling channel 3, thereby improving the heat exchange efficiency between the battery module and the liquid cooling plate 2, thereby improving the heat dissipation efficiency of the battery module, and the liquid cooling plate 2 is formed by welding a thin temperature balancing plate 22 and a flow channel plate 21, so that the overall thickness of the liquid cooling plate 2 is thin, thereby reducing the volume and weight of the liquid cooling plate 2 and improving the overall volume energy density of the battery module.

[0035] In this embodiment, in order to stably connect the liquid cooling plate 2 and the frame 1 together, the edge of the temperature balancing plate 22 is fixed to the frame 1 by friction welding. Friction welding has high and stable welding quality, and can avoid common defects such as cracks, pores, slag inclusions and incomplete melting during welding. In addition, friction welding has high dimensional accuracy and geometric accuracy, which can improve the connection accuracy of the liquid cooling plate 2 and the frame 1.

[0036] In order to achieve stable flow and recycling of the coolant in the liquid cooling channel 3, a liquid inlet pipe 4 and a liquid outlet pipe 5 are provided on the liquid cooling plate 2. The liquid cooling channel 3 includes a liquid inlet and a liquid outlet. The liquid inlet is connected to the liquid inlet pipe 4, and the liquid outlet is connected to the liquid outlet pipe 5. The liquid cooling channel 3 includes a main channel 31 and one or more branch channels 32 connected to the main channel 31.

[0037] The liquid cooling channel 3 of this embodiment is formed on the channel plate 21 and sealed by welding with the temperature balancing plate 22, and the liquid inlet pipe 4 and the liquid outlet pipe 5 are both provided on the temperature balancing plate 22. Specifically, the liquid cooling channel 3 can be formed on the channel plate 21 by stamping or injection molding. Since the liquid cooling channel 3 is formed on the channel plate 21, the liquid cooling channel 3 is relatively protruding and not easy to be connected with the tubular component, so the liquid inlet pipe 4 and the liquid outlet pipe 5 in this embodiment are connected with the temperature balancing plate 22.

[0038] Ginseng Figures 3 to 7 As shown, multiple branch channels 32 of this embodiment are connected in parallel to the main channel 31. Furthermore, since the coolant will exchange heat with the battery module during the flow in the main channel 31, the temperature of the coolant is positively correlated with its flow distance. When the liquid cooling channel 3 adopts a single main channel 31 or a combination of a single main channel 31 and a single branch channel 32, at the end of the coolant flow path, its temperature will be greatly increased relative to the temperature at the beginning of the flow path, resulting in a large difference in the heat exchange efficiency between various parts of the liquid cooling plate 2 and the battery module, thereby making the heat dissipation efficiency of the battery module at the end of the coolant flow path poor, affecting the overall performance of the battery module.

[0039] Therefore, based on the above reasons, Figure 3 , Figure 4 As shown, in this example, a plurality of branch channels 32 are provided, and the plurality of branch channels 32 are connected in parallel to the main channel 31. The coolant can quickly diffuse to various parts of the flow channel plate 21 through the branch channels 32, so that various parts of the liquid cooling plate 2 can exchange heat with the battery module in a more balanced manner, thereby improving the heat dissipation efficiency of the liquid cooling plate 2 to the battery module and its stability during operation.

[0040] The main channel 31 in this embodiment includes a first main channel 311, a second main channel 312 and a third main channel 313. The first end of the first main channel 311 is connected to the liquid inlet, the second end of the third main channel 313 is connected to the liquid outlet, and the first end and the second end of the second main channel 312 are connected to the second end of the first main channel 311 and the first end of the third main channel 313 respectively.

[0041] Specifically, the first main channel 311, the second main channel 312 and the third main channel 313 can be arranged near the edge of the channel plate 21. In order to maximize the use of the space of the channel plate 21 and facilitate processing and molding, the first main channel 311 is arranged parallel to the third main channel 313, and the second main channel 312 is arranged vertically at the ends of the first main channel 311 and the third main channel 313. Of course, when there are a large number of branch channels 32, the second main channel 312 may not be arranged, and the first main channel 311 and the third main channel 313 are connected through the branch channel 32.

[0042] Furthermore, different arrangements of the branch channels 32 may be used for different parts of the flow channel plate 21. Specifically, the flow channel plate 21 may be divided into three areas, namely, a first area close to the second main flow channel 312, a third area close to the liquid inlet and the liquid outlet, and a second area between the first area and the third area.

[0043] Ginseng Figure 5 As shown, in the first region, the main channel 31 is connected to one or more first branch channels 321 , the first end of the first branch channel 321 is connected to the first main channel 311 , and the second end is connected to the second main channel 312 and / or the third main channel 313 .

[0044] Considering that the first area is relatively far away from the liquid inlet, the flow rate of the coolant in this area has been greatly reduced. Therefore, in order to reduce the flow loss of the coolant in this area, the first branch channel 321 is constructed into a plurality of side-by-side straight flow channels, and the ends of each straight flow channel can be directly connected to the main channel 31, or can be connected to the main channel 31 after converging at the ends.

[0045] Ginseng Figure 6 As shown, in the second region, the main flow channel 31 is connected to one or more second branch flow channels 322 , the first end of the second branch flow channel 322 is connected to the first main flow channel 311 , and the second end and the third end are connected to the third main flow channel 313 .

[0046] Considering that the second region is relatively close to the center of the flow channel plate 21, that is, close to the center of the battery module on the liquid cooling plate 2, and the heat dissipation efficiency at the center of the battery module is poor, the second flow channels 322 in this region need to be densely arranged to improve the heat exchange efficiency between the liquid cooling plate 2 and the battery module. In this region, the second flow channels 322 can be configured as a curved folded flow channel and / or a plurality of side-by-side straight flow channels.

[0047] Furthermore, in order to increase the diffusion speed of the coolant in the second region, the first end of the second branch channel 322 is arranged close to the center of the second branch channel 322, and the second end and the third end of the second branch channel 322 are respectively arranged at the edge portions on both sides of the second branch channel 322. Moreover, when the flow channel plate 21 is a narrow and long plate body, the area of ​​the second region will be relatively larger than the first region and the third region, and a plurality of second branch channels 322 can be arranged in the second region.

[0048] Ginseng Figure 7 As shown, in the third area, the main channel 31 is connected to one or more third branch channels 323, the first end of the third branch channel 323 is connected to the liquid inlet, the second end is connected to the third branch channel 323, and the third end is connected to the liquid outlet.

[0049] Since the third region is relatively close to the liquid inlet and the liquid outlet, the third branch channel 323 in this region can be directly connected to the liquid inlet and the liquid outlet, reducing the flow path of the coolant in this region. In addition, the flow speed of the coolant in this region is relatively fast and the temperature is relatively low, and the heat exchange efficiency of the coolant in this region is high, so the third branch channel 323 in this region can be arranged relatively sparsely.

[0050] Ginseng Figure 3 As shown, in order to form a liquid-cooling channel 3 on a thinner flow channel plate 21, the flow channel plate 21 in this embodiment includes a first bottom plate 211 distributed in the circumferential direction and a first top plate 212 protruding from the first bottom plate 211, and the liquid-cooling channel 3 is arranged on the first top plate 212 and is recessed in a direction away from the temperature equalizing plate 22. The arrangement of the liquid-cooling channel 3 in this embodiment can greatly reduce the thickness of the flow channel plate 21, thereby reducing the overall thickness of the liquid cooling plate 2. The first top plate 212 and the liquid-cooling channel 3 in this embodiment can be formed by stamping, or can be integrally formed with the flow channel plate 21 by casting or injection molding.

[0051] Furthermore, in order to prevent the depth of the liquid cooling channel 3 from being too large and causing damage to the channel plate 21, the depth of the liquid cooling channel 3 is less than or equal to the distance between the first bottom plate 211 and the first top plate 212. Of course, in a preferred embodiment, the depth of the liquid cooling channel 3 is equal to the distance between the first bottom plate 211 and the first top plate 212, that is, the bottom end of the liquid cooling channel 3 is kept flush with the bottom end of the first bottom plate 211, so that it is convenient to use components to support the channel plate 21 from the bottom.

[0052] Ginseng Figure 3 As shown, in order to make the temperature averaging plate 22 fit the flow channel plate 21 as closely as possible to reduce the thickness of the liquid cooling plate 2 and prevent leakage of the coolant, the temperature averaging plate 22 in this embodiment includes a second bottom plate 221 distributed along the circumference and a second top plate 222 protruding from the second bottom plate 221, and the first bottom plate 211 and the second bottom plate 221 are sealed and fixed. The shape and size of the second top plate 222 are completely consistent with those of the first top plate 212, so that the temperature averaging plate 22 can be completely seamlessly stacked on the flow channel plate 21.

[0053] Furthermore, when the flow channel plate 21 and the temperature equalizing plate 22 are sealed and connected, the raised first top plate 212 and the second top plate 222 can enable the liquid cooling plate 2 to form a supporting platform protruding toward the frame 1, and the first bottom plate 211 and the second bottom plate 221 can enable the liquid cooling plate 2 to form an annular plate body, and the supporting platform can support and cool the battery module placed in the frame 1, and the annular plate body can be fixedly connected to the frame 1 by friction welding.

[0054] Ginseng Figure 2 , Figure 5 , Figure 8 and Fig. 9 As shown, in this embodiment, the frame 1 includes a first frame body 11 and a second frame body 12 which are parallel to each other, and a third frame body 13 and a fourth frame body 14 which are parallel to each other. The third frame body 13 and the fourth frame body 14 are fixedly installed between the first frame body 11 and the second frame body 12. The lower surface height of the third frame body 13 and the fourth frame body 14 is higher than the lower surface height of the first frame body 11 and the second frame body 12. The inner sides of the first frame body 11 and the second frame body 12 are respectively provided with a first mounting plate 111 and a second mounting plate 121, and both sides of the liquid cooling plate 2 are respectively fixedly installed below the first mounting plate 111 and the second mounting plate 121.

[0055] Furthermore, the frame 1 also includes a plurality of support plates 15 located below the liquid cooling plate 2, and the two ends of the support plates 15 are fixedly mounted on the bottom of the first frame 11 and the second frame 12, respectively. The ends of the support plates 15 can be connected to the first frame 11 and the second frame 12 by bolts and nuts, so as to facilitate the disassembly of the support plates 15. In addition, since the surface of the liquid cooling plate 2 is uneven due to the presence of the liquid cooling channel 3, a protrusion protruding toward the liquid cooling plate 2 can be correspondingly provided on the support plate 15, and the shape of the protrusion is configured to fit with the surface of the liquid cooling plate 2, thereby increasing the contact area between the support plate 15 and the liquid cooling plate 2, and improving the supporting effect of the support plate 15 on the liquid cooling plate 2 and the battery module on the liquid cooling plate 2.

[0056] It can be seen from the technical solutions of the above embodiments that the utility model has the following beneficial effects:

[0057] The liquid-cooled energy storage box in the utility model forms a liquid-cooled flow channel on the flow channel plate and is sealed by a temperature-averaging plate, which can not only prevent leakage of the coolant, but also greatly reduce the thickness of the traditional liquid-cooling plate. By connecting the edge of the temperature-averaging plate with the frame, the overall height of the liquid-cooled energy storage box is reduced, and the volume utilization rate of the liquid-cooled energy storage box is improved. The design of the diversion channel effectively improves the uniformity of the coolant flow rate and improves the heat dissipation efficiency of the liquid-cooling plate to the battery module.

[0058] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A liquid-cooled energy storage box, characterized in that: The liquid-cooled energy storage box includes a battery module, a frame surrounding the battery module, a liquid cooling plate fixed to the bottom of the frame and supporting the battery module, the liquid cooling plate includes a temperature averaging plate supporting the battery module, a flow channel plate located below the temperature averaging plate and welded to the temperature averaging plate, and a liquid cooling flow channel formed between the temperature averaging plate and the flow channel plate.

2. The liquid-cooled energy storage box according to claim 1, characterized in that: The edge of the temperature homogenizing plate is fixed to the frame by friction welding.

3. The liquid-cooled energy storage box according to claim 2, characterized in that: A liquid inlet pipe and a liquid outlet pipe are provided on the liquid cooling plate, the liquid cooling flow channel includes a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid inlet pipe, the liquid outlet is connected to the liquid outlet pipe, and the liquid cooling flow channel includes a main flow channel and one or more branch flow channels connected to the main flow channel.

4. The liquid-cooled energy storage box according to claim 3, characterized in that: The liquid cooling channel is formed on the channel plate and sealed by welding the channel plate and the temperature balancing plate. The liquid inlet pipe and the liquid outlet pipe are both arranged on the temperature balancing plate.

5. The liquid-cooled energy storage box according to claim 3, characterized in that: A plurality of branch flow channels are connected in parallel to the main flow channel.

6. The liquid-cooled energy storage box according to claim 3, characterized in that: The main channel includes a first main channel, a second main channel and a third main channel. The first end of the first main channel is connected to the liquid inlet, the second end of the third main channel is connected to the liquid outlet, and the first end and the second end of the second main channel are respectively connected to the second end of the first main channel and the first end of the third main channel.

7. The liquid-cooled energy storage box according to claim 2, characterized in that: The flow channel plate includes a first bottom plate distributed along the circumferential direction and a first top plate protruding above the first bottom plate. The liquid cooling flow channel is arranged on the first top plate and is recessed in a direction away from the temperature equalizing plate.

8. The liquid-cooled energy storage box according to claim 7, characterized in that: The depth of the liquid cooling channel is less than or equal to the distance between the first bottom plate and the first top plate.

9. The liquid-cooled energy storage box according to claim 7, characterized in that: The temperature homogenizing plate comprises a second bottom plate distributed along the circumferential direction and a second top plate protruding above the second bottom plate, and the first bottom plate and the second bottom plate are sealed and fixed.

10. The liquid-cooled energy storage box according to claim 1, characterized in that: The frame includes a first frame body and a second frame body which are arranged in parallel with each other, and a plurality of support plates located below the liquid cooling plate, and two ends of the support plates are fixedly mounted on the bottom of the first frame body and the second frame body respectively.

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