A cold plate assembly and an electric appliance

Abstract

The application provides a cold plate assembly and an electric device. The cold plate assembly is used for cooling a first battery module and a second battery module stacked along a first direction. The first direction is a stacking direction of the first battery module and the second battery module. The first battery module is spaced apart along a second direction perpendicular to the first direction. The cold plate assembly comprises a first cold plate used for cooling the first battery module spaced apart. The first cold plate comprises a bending segment and a straight segment integrally formed along the second direction. The bending segment is in contact with an end surface of the first battery module away from the second battery module. The bending segment is in contact with a side surface of the first battery module in the second direction. The straight segment is arranged in a space between adjacent first battery modules. The straight segment and the bending segment are both arranged in multiple and alternately arranged along the second direction. Here, the first cold plate adopts the alternately arranged structure of the bending segment and the straight segment integrally formed along the second direction, thereby saving the independent installation space required by the traditional cold plate.

Description

Technical Field

[0001] This application relates to the field of heat exchange technology, specifically to a cold plate assembly and electrical equipment. Background Technology

[0002] With the rapid development of my country's new energy sector, new challenges have arisen for the heat dissipation of battery modules. Typically, cold plates are installed on the surface of the battery modules to dissipate heat. However, when battery modules are spaced apart, multiple sets of cold plates are needed to ensure each module remains within a suitable temperature range. But installing multiple cold plates requires multiple sets of inlet and outlet pipes, resulting in complex piping and a large independent space required for the cold plate assembly. Summary of the Invention

[0003] In view of this, this application provides a cold plate assembly that solves the problem that multiple sets of pipes are needed to cool multiple battery modules, resulting in complex piping and a large independent space required for the installation of the cold plate assembly. This application also provides an electrical device including the above-mentioned cold plate assembly.

[0004] To achieve the above objectives, this application provides the following technical solution: A cold plate assembly is provided for cooling a first battery module and a second battery module stacked along a first direction, wherein the first direction is the stacking direction of the first battery module and the second battery module, and a plurality of first battery modules are spaced apart along a second direction perpendicular to the first direction. The cold plate assembly includes a first cold plate for cooling the plurality of spaced-apart first battery modules. The first cold plate includes a bent section and a straight section integrally formed along the second direction. The bent section contacts the end face of the first battery module opposite to the second battery module and contacts the side face of the first battery module in the second direction. The straight section is disposed in the interval between adjacent first battery modules. A plurality of straight sections and bent sections are provided along the second direction and are arranged alternately.

[0005] Optionally, the cold plate assembly includes a second cold plate, the second cold plate comprising: A partition plate is disposed between the first battery module and the second battery module in a first direction, and has heat exchange contact with the second battery module and a plurality of the first battery modules; The end plates are provided in multiple manner and are all connected to the partition plate. The multiple end plates respectively contact different sides of different first battery modules.

[0006] Optionally, a plurality of the end plates are arranged at intervals along the second direction, and the end plates are disposed between the bent section and the side of the first battery module.

[0007] Optionally, the straight section and the bent section adjacent to the straight section may form an L-shaped structure in some parts.

[0008] Optionally, the first cold plate includes a plurality of cooling pipes spaced apart along a third direction, the third direction being perpendicular to both the first and second directions, and a heat spreader is provided on the end face of the first battery module facing away from the second battery module, the heat spreader being disposed between the cooling pipes and the first battery module.

[0009] Optionally, in the third direction, the terminals are disposed at both ends of the first battery module, and the spacing between the cooling pipes located at both ends of the first battery module is smaller than the spacing between the cooling pipes located in the middle of the first battery module.

[0010] Optionally, the cooling pipe is a flat pipe, and the flat surface of the flat pipe is in heat exchange contact with the first battery module.

[0011] Optionally, it also includes a third cold plate, which makes heat exchange contact with the end face of the second battery module away from the first battery module.

[0012] Optionally, it includes a first liquid guide pipe connected to the first cold plate, a second liquid guide pipe connected to the second cold plate, and a third liquid guide pipe connected to the third cold plate, wherein the diameter of the second liquid guide pipe is larger than the diameter of the first liquid guide pipe and the third liquid guide pipe.

[0013] An electrical device includes a battery module and a cold plate assembly as described in any one of the preceding claims, the cold plate assembly being used to cool the battery module.

[0014] The cold plate assembly provided in this application includes a first cold plate for cooling multiple spaced-apart first battery modules. The first cold plate includes a bent section and a straight section integrally formed along a second direction. The bent section contacts the end face of the first battery module opposite to the second battery module and also contacts the side face of the first battery module in the second direction. The straight section is disposed within the gap between adjacent first battery modules. Multiple straight sections and bent sections are provided along the second direction and are arranged alternately. That is, each bent section includes a first portion that makes heat exchange contact with the end face of the first battery module opposite to the second battery module and a second portion that contacts the side face of the first battery module, so that the bent portion contacts the side face and end face of the first battery module. Adjacent bent sections are connected by straight sections, which are disposed within the gap between adjacent first battery modules. Here, the first cold plate adopts an alternating arrangement of bent and straight sections integrally formed along the second direction, which enhances the turbulence effect and improves heat exchange efficiency. The bent sections contact the end face and side face of the battery module, saving the independent installation space required by traditional cold plates. The straight sections are embedded in the gap between adjacent first battery modules, saving the independent installation space required by traditional cold plates. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the cold plate assembly, the first battery module, and the second battery module provided in this embodiment.

[0017] Figure 2 This is a structural schematic diagram of the cold plate assembly.

[0018] Figure 3 This is a structural schematic diagram of the first cold plate from a first-view perspective.

[0019] Figure 4 This is a schematic diagram of the first cold plate from a second perspective.

[0020] Figure 5 This is a cross-sectional schematic diagram of the cooling pipe.

[0021] exist Figures 1 to 5 middle: 1-First cold plate, 2-Second cold plate, 3-Third cold plate, 4-Heat spreader, 5-First battery module, 6-Second battery module, 7-First liquid guide tube, 8-Second liquid guide tube, 9-Third liquid guide tube; 11-Bending section, 12-Straight section, 13-Cooling pipe, 21-Divider plate, 22-End plate. Detailed Implementation

[0022] This application provides a cold plate assembly that solves the problem of low cooling efficiency of battery modules due to the need for multiple sets of pipes when cooling multiple battery modules, resulting in complex pipework in the cold plate assembly. This application also provides an electrical device including the aforementioned cold plate assembly.

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] like Figures 1 to 5 As shown, this application embodiment provides a cold plate assembly for cooling a first battery module 5 and a second battery module 6 stacked along a first direction. The first direction is the stacking direction of the first battery module 5 and the second battery module 6, and multiple first battery modules 5 are spaced apart along a second direction perpendicular to the first direction. The cold plate assembly includes a first cold plate 1 for cooling multiple spaced first battery modules 5. The first cold plate 1 includes a bent section 11 and a straight section 12 integrally formed along the second direction. The bent section 11 contacts the end face of the first battery module 5 opposite to the second battery module 6, and the bent section 11 contacts the side face of the first battery module 5 located in the second direction. For example, when the first battery module 5 is a common cuboid structure, the bent section 11 can be a U-shaped structure fastened to the end face and side face of the cuboid structure. A straight section 12 is disposed within the interval between adjacent first battery modules 5. Multiple straight sections 12 and multiple bent sections 11 are disposed along the second direction and arranged alternately. Since different bent sections 11 are used to cool the end faces of different first battery modules 5, the bent sections 11 are fastened to different first battery modules 5 to cool them respectively. The straight sections 12 are used to connect adjacent bent sections 11, allowing coolant to flow between adjacent bent sections 11 to continuously cool different first battery modules 5. With this arrangement, by arranging the first cold plate 1 with multiple alternately arranged bent sections 11 and multiple straight sections 12, only one set of first cold plates 1 is needed to dissipate heat from multiple spaced-apart first battery modules 5. Only one set of inlet and outlet pipes is needed to achieve coolant circulation within the first cold plate 1. This arrangement simplifies the pipe arrangement of the first cold plate 1 and improves the heat dissipation efficiency of the first cold plate 1 for the battery modules.

[0025] For example, the first direction can be the vertical direction, such as... Figure 1 and Figure 2 The first direction is indicated by the double-headed arrow Z; the second direction can be horizontal, such as... Figure 1 and Figure 2 The direction indicated by the double-headed arrow X.

[0026] In the cold plate assembly described above, each bent segment 11 includes a first portion that makes heat exchange contact with the end face of the first battery module 5 away from the second battery module 6, and a second portion that makes contact with the side face of the first battery module 5, so that the bent portion contacts the side face and end face of the first battery module 5. Adjacent bent segments 11 are connected by straight segments 12, which are disposed within the gap between adjacent first battery modules 5. Here, the first cold plate 1 adopts an alternating arrangement of bent segments 11 and straight segments 12 integrally formed along the second direction, which enhances the turbulence effect and improves heat exchange efficiency. The bent segments 11 contact the end face and side face of the battery module, saving the independent installation space required by traditional cold plates, and the straight segments 12 are embedded in the gap between adjacent first battery modules 5, saving the independent installation space required by traditional cold plates.

[0027] In some embodiments, please refer to Figure 1 and Figure 2 The cold plate assembly includes a second cold plate 2, which includes a partition plate 21 and end plates 22. The partition plate 21 is disposed in a first direction between the first battery module 5 and the second battery module 6, and has heat exchange contact with the second battery module 6 and multiple first battery modules 5. Specifically, coolant circulates within the partition plate 21 to cool the first battery modules 5 and the second battery modules 6 located on both sides of the partition plate 21. Multiple end plates 22 are provided and connected to the partition plate 21, and each end plate 22 contacts a different side of a different first battery module 5. Specifically, the end plates 22 are provided on different sides of the first battery modules 5, that is, each first battery module 5 has an end plate 22 on a different side, and the end plates 22 can limit the position of the battery module; furthermore, the end plates 22 can also be connected to the first cold plate 1, that is, the end plates 22 can provide an installation position for the first cold plate 1, improving the fixing effect of the first cold plate 1.

[0028] Further details based on the above embodiments can be found in the following examples. Figure 2Multiple end plates 22 are arranged at intervals along a second direction, and are positioned between the bent section 11 and the side of the first battery module 5. Since the bent section 11 is also arranged at intervals along the second direction, the arrangement direction of the multiple end plates 22 is the same as that of the multiple bent sections 11. Specifically, the end plates 22 extend along a first direction and are arranged at intervals along the second direction. The end plates 22 can provide an installation position for the area of ​​the bent section 11 located on the side of the first battery module 5, thereby further improving the fixing effect on the first cold plate 1, fixing the first cold plate 1 and the second cold plate 2 together, improving the overall integrity of the cold plate assembly, and thus improving the tightness of the fit between the first cold plate 1 and the second cold plate 2 and the first battery module 5.

[0029] In some embodiments, please refer to Figure 3 and Figure 4 The straight section 12 and the adjacent bent section 11 partially form an L-shaped structure. It should be noted that this explanation uses a battery module with a rectangular parallelepiped structure, where the bent section 11 and the straight section 12 are arranged as an example. For instance, Figure 4 The straight segment 12 indicated by the middle arrow a and Figure 4 The bent portion 11, indicated by the middle arrow b, forms an L-shaped structure with the other two parts. Figure 4 The straight segment 12 indicated by the middle arrow a and Figure 4 The bent section 11 shown by the middle arrow c also forms an L-shaped structure. This arrangement allows the bent section 11 of the first cold plate 1 to contact and fit against the end face and side face of the battery module, and the straight section 12 to be embedded in the gap between adjacent first battery modules 5, reducing the space occupied by the first cold plate 1, thereby further reducing the independent installation space required for the first cold plate 1.

[0030] Furthermore, depending on the different shapes and structures of the first battery module 5, the included angle between the bent section 11 and the straight section 12 can also be V-shaped, Z-shaped, or other structures.

[0031] In some embodiments, referring to the figures, the first cold plate 1 includes a plurality of cooling pipes 13 spaced apart along a third direction. This third direction is perpendicular to both the first and second directions. For example, the first direction may be the height direction of the first battery module 5, the second direction may be the length direction of the first battery module 5, and the third direction may be the width direction of the first battery module 5. Figure 2The direction indicated by the double-headed arrow Y. Multiple cooling pipes 13 are used to cool different parts of the first battery module 5 in a third direction. Since the multiple cooling pipes 13 are spaced apart, the first cold plate 1 has a better cooling effect on the part of the first battery module 5 facing away from the second battery module 6, closer to the cooling pipes 13, while the first cold plate 1 has a poorer cooling effect on the part of the first battery module 5 facing away from the second battery module 6, farther from the cooling pipes 13. That is, the cooling effect on different parts of the end face of the first battery module 5 facing away from the second battery module 6 is different, resulting in a difference in the cooling effect of the first cold plate 1 on the end face of the first battery module 5 facing away from the second battery module 6. Therefore, a heat spreader 4 is provided on the end face of the first battery module 5 facing away from the second battery module 6, and the heat spreader 4 is positioned between the cooling pipes 13 and the first battery module 5. With this configuration, when the temperature of the first battery module 5 rises, the heat from the first battery module 5 is transferred to the heat spreader 4 through heat conduction. The heat spreader 4 then distributes the heat evenly across its surface. The cooling pipes 13 mounted on the heat spreader 4 absorb the heat, thereby cooling the first battery module 5. The heat spreader 4 distributes the heat evenly to different areas. Here, due to the configuration of the heat spreader 4, the cooling pipes 13 can cool the first battery module 5 more evenly, improving the uniformity of cooling of the end face of the first battery module 5 away from the second battery module 6 by the first cold plate 1.

[0032] For example, the heat spreader 4 can be connected to the cooling pipe 13 by means of thermally conductive structural adhesive. This can improve the fixing effect of the heat spreader 4 and the cooling pipe 13, and also improve the heat exchange speed between the heat spreader 4 and the cooling pipe 13, thereby improving the cooling efficiency of the cooling pipe 13 for the first battery module 5.

[0033] In some embodiments, please refer to Figure 2 In the third direction, the terminals are located at both ends of the first battery module 5, and the spacing between the cooling pipes 13 at both ends of the first battery module 5 is smaller than the spacing between the cooling pipes 13 located in the middle of the first battery module 5. Specifically, since the current overcurrent is larger in the area where the terminals are located in the battery module, this area is usually the area with higher heat in the battery module. Here, by arranging the cooling pipes 13 closer to the terminal area of ​​the first battery module 5 more densely and the cooling pipes 13 closer to the non-terminal area of ​​the first battery module 5 more sparsely, the area with more dense cooling pipes 13 has a stronger cooling effect and cools the higher temperature area of ​​the first battery module 5, while the area with less dense cooling pipes 13 has a weaker cooling effect and cools the lower temperature area of ​​the first battery module 5. This arrangement avoids excessively high temperatures in any part of the first battery module 5, so that the first battery module 5 as a whole operates at a more suitable temperature.

[0034] For example, the distance between the cooling pipes 13 located at both ends of the first battery module 5 is L1, and the distance between the cooling pipes 13 located in the middle of the first battery module 5 is L2, wherein L1 and L2 satisfy: 0.3×L2<L1<L2.

[0035] Of course, for the scheme where the terminal post of the first battery module 5 is only set on one side, it is only necessary to ensure that the distance of the cooling pipe 13 close to the area is less than the distance far from the area.

[0036] In some embodiments, please refer to Figure 5 The cooling pipe 13 is a flat tube, and its flat surface makes heat exchange contact with the first battery module 5. By making the cooling pipe 13 a flat tube, with its largest flat surface in heat exchange contact with the first battery module 5, the contact area between the cooling pipe 13 and the first battery module 5 is increased, thereby improving the heat exchange efficiency of the cooling pipe 13 to the first battery module 5. Furthermore, by having the largest flat surface of the flat tube in heat exchange contact with the first battery module 5, the bonding area between the cooling pipe 13 and the heat exchange plate 4 is increased when the cooling pipe 13 is fixed to the heat exchange plate 4 with thermally conductive adhesive, thereby improving the connection stability between the heat exchange plate 4 and the cooling pipe 13.

[0037] In some embodiments, please refer to Figure 1 and Figure 2 The cold plate assembly also includes a third cold plate 3, which makes heat exchange contact with the end face of the second battery module 6 that is away from the first battery module 5. In other words, in the cold plate assembly, the first cold plate 1 cools the end face of the first battery module 5 that is away from the second battery module 6, the second cold plate 2 cools the end face of the first battery module 5 that is close to the second battery module 6 and the end face of the second battery module 6 that is close to the first battery module 5, and the third cold plate 3 cools the end face of the second battery module 6 that is away from the first battery module 5. This arrangement improves the cooling efficiency of the first cold plate 1, the second cold plate 2, and the third cold plate 3 on the first battery module 5 and the second battery module 6, ensuring that the first battery module 5 and the second battery module 6 can operate within a suitable temperature range.

[0038] Further details based on the above embodiments can be found in the following examples. Figure 2The cold plate assembly includes a first liquid guide pipe 7 connected to the first cold plate 1, a second liquid guide pipe 8 connected to the second cold plate 2, and a third liquid guide pipe 9 connected to the third cold plate 3. The first liquid guide pipe 7 is used to introduce coolant into or out of the first cold plate 1; the second liquid guide pipe 8 is used to introduce coolant into or out of the second cold plate 2; and the third liquid guide pipe 9 is used to introduce coolant into or out of the third cold plate 3. As can be seen from the above embodiment, since the first cold plate 1 and the third cold plate 3 only cool one end face of the first battery module 5 or the second battery module 6, while the second cold plate 2 cools both end faces (one end face of the first battery module 5 and one end face of the second battery module 6), the heat dissipation pressure of the second cold plate 2 is greater than that of the first cold plate 1 and the third cold plate 3. Therefore, the diameter of the second liquid guide pipe 8 is ensured to be larger than the diameters of the first liquid guide pipe 7 and the third liquid guide pipe 9. In this way, when the first battery module 5 and the second battery module 6 are cooled by the first cold plate 1, the second cold plate 2 and the third cold plate 3, the cooling capacity of the second cold plate 2, which has a higher cooling pressure, can be improved. This enables the first cold plate 1, the second cold plate 2 and the third cold plate 3 to achieve efficient cooling of the first battery module 5 and the second battery module 6, thereby improving the cooling effect of the first battery module 5 and the second battery module 6.

[0039] This application also provides an electrical device that includes the above-mentioned cold plate assembly. Since the electrical device includes the above-mentioned cold plate assembly, the beneficial effects of the electrical device brought by the above-mentioned cold plate assembly are as described above and will not be repeated here.

[0040] Specifically, the electrical equipment includes a battery module and a cold plate assembly. The battery module can be the first battery module 5 and the second battery module 6 mentioned above. The first battery module 5 and the second battery module 6 are used to provide power to the electrical equipment to ensure the normal operation of the electrical equipment. The cold plate assembly is used to cool the first battery module 5 and the second battery module 6 to ensure that the first battery module 5 and the second battery module 6 are used within a suitable temperature range.

[0041] For example, electrical equipment can be vehicles or other transportation machinery, construction machinery, or agricultural machinery that are powered by electricity.

[0042] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0043] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0044] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0045] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0046] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0047] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A cold-plate assembly, characterized in that, The cold plate assembly is used to cool a first battery module (5) and a second battery module (6) stacked along a first direction, the first direction being the stacking direction of the first battery module (5) and the second battery module (6), and the first battery module (5) is provided in multiple spaced intervals along a second direction perpendicular to the first direction. The cold plate assembly includes a first cold plate (1) for cooling multiple spaced first battery modules (5), the first cold plate (1) including a bent section (11) and a straight section (12) integrally formed along the second direction, the bent section (11) contacting the end face of the first battery module (5) away from the second battery module (6), and the bent section (11) contacting the side face of the first battery module (5) located in the second direction, the straight section (12) being provided in the interval between adjacent first battery modules (5), and the straight section (12) and the bent section (11) being provided in multiple alternating intervals along the second direction.

2. The cold plate assembly according to claim 1, characterized in that, The cold plate assembly includes a second cold plate (2), which comprises: A partition plate (21) is disposed in a first direction between the first battery module (5) and the second battery module (6), and has heat exchange contact with the second battery module (6) and the plurality of first battery modules (5); The end plates (22) are provided in multiple ways and are all connected to the partition plate (21). The multiple end plates (22) respectively contact different sides of different first battery modules (5).

3. The cold plate assembly according to claim 2, characterized in that, Multiple end plates (22) are arranged at intervals along the second direction, and the end plates (22) are disposed between the bent section (11) and the side of the first battery module (5).

4. The cold plate assembly according to claim 1, characterized in that, The straight section (12) and the bent section (11) adjacent to the straight section (12) form an L-shaped structure in some parts.

5. The cold plate assembly according to claim 1, characterized in that, The first cold plate (1) includes a plurality of cooling pipes (13) arranged at intervals along a third direction. The third direction is perpendicular to both the first direction and the second direction. A heat spreader (4) is provided on the end face of the first battery module (5) away from the second battery module (6). The heat spreader (4) is disposed between the cooling pipes (13) and the first battery module (5).

6. The cold plate assembly according to claim 5, characterized in that, In the third direction, the poles are disposed at both ends of the first battery module (5), and the spacing between the cooling pipes (13) at both ends of the first battery module (5) is smaller than the spacing between the cooling pipes (13) in the middle of the first battery module (5).

7. The cold plate assembly according to claim 5, characterized in that, The cooling pipe (13) is a flat pipe, and the flat surface of the flat pipe is in heat exchange contact with the first battery module (5).

8. The cold plate assembly according to claim 2, characterized in that, It also includes a third cold plate (3), which has heat exchange contact with the end face of the second battery module (6) away from the first battery module (5).

9. The cold plate assembly according to claim 8, characterized in that, It includes a first liquid guide pipe (7) connected to the first cold plate (1), a second liquid guide pipe (8) connected to the second cold plate (2), and a third liquid guide pipe (9) connected to the third cold plate (3). The diameter of the second liquid guide pipe (8) is larger than the diameter of the first liquid guide pipe (7) and the third liquid guide pipe (9).

10. An electrical appliance, characterized in that, It includes a battery module and a cold plate assembly according to any one of claims 1-9, the cold plate assembly being used to cool the battery module.

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