Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body, a first partition plate and a battery module, the first partition plate divides the interior of the box body into a mounting cavity and a shunting cavity which are located on the two sides of the thickness direction of the first partition plate, the battery module is arranged in the mounting cavity and comprises a plurality of battery packs which are arranged at intervals in the first direction, and each battery pack comprises a plurality of cylindrical batteries which are sequentially arranged in the second direction; a heat exchange flow channel extending in the second direction is defined between every two adjacent battery packs in a matched mode, and the multiple first through holes in the first partition plate correspond to the multiple heat exchange flow channels one to one and communicate with the multiple heat exchange flow channels. According to the battery pack disclosed by the embodiment of the utility model, the first through hole can play a role in guiding and shunting fluid in the shunting cavity, so that the flowing efficiency of the fluid in the shunting cavity to the heat exchange runner is improved, and meanwhile, a heat exchange medium in the heat exchange runner is directly contacted with the battery monomers, so that the heat exchange efficiency is improved; and the heat exchange efficiency and the heat exchange rate of the battery pack can be improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery pack. Background Art

[0002] Relevant technologies point out that currently, cylindrical battery cooling methods mostly use serpentine tube liquid cooling to cool the battery, which has a complex structure and limited thermal conductivity, and can no longer meet high-power performance requirements. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which can improve the flow efficiency of the fluid in the shunt cavity flowing to the heat exchange flow channel, so that the cylindrical battery can be cooled quickly, thereby improving the heat exchange efficiency and heat exchange rate of the battery pack.

[0004] According to the battery pack of the embodiment of the utility model, the battery pack includes: a box body, on which a liquid inlet and a liquid outlet are formed; a first partition, the first partition is arranged in the box body, and separates an installation cavity and a shunt cavity located on both sides of the thickness direction of the first partition in the box body, and the shunt cavity is communicated with the liquid inlet; a battery module, the battery module is arranged in the installation cavity and includes a plurality of battery groups arranged at intervals along a first direction, each of the battery groups includes a plurality of cylindrical batteries arranged in sequence along a second direction, and two adjacent battery groups cooperate to define a heat exchange channel extending along the second direction, and the first direction is perpendicular to the second direction; wherein, a plurality of first through holes are formed on the first partition plate and penetrate the first partition plate along the thickness direction, and the plurality of first through holes correspond one-to-one to and are communicated with the plurality of heat exchange channels.

[0005] According to the battery pack of the embodiment of the utility model, by providing a first partition and providing first through holes on the first partition corresponding to the heat exchange channels of the battery modules, when the battery pack is working, the heat exchange medium in the diverter cavity can enter the corresponding heat exchange channel through multiple first through holes respectively, to achieve heat exchange with the battery cells on both sides of the heat exchange channel, wherein the multiple first through holes can guide and divert the fluid in the diverter cavity, improve the flow efficiency of the fluid in the diverter cavity to the heat exchange channel, ensure the coolant flow in the heat exchange channel, and at the same time, the heat exchange channel is directly defined between the two battery groups, so that the heat exchange medium in the heat exchange channel can directly contact the battery cells to achieve heat exchange, improve the heat exchange efficiency, and further improve the heat exchange efficiency and heat exchange rate of the battery pack.

[0006] According to some embodiments of the present invention, in a direction from the installation cavity to the diversion cavity, a cross-sectional area of ​​the first through hole gradually increases.

[0007] According to some embodiments of the present invention, a peripheral edge of the first through hole is bent along an arc toward one side of the installation cavity.

[0008] According to some embodiments of the present invention, the first through hole on the first partition is formed by stamping.

[0009] According to some embodiments of the present invention, a sealing gasket is provided at the periphery of the first through hole, and the sealing gasket extends along the circumference of the first through hole and abuts between the first partition plate and the battery module.

[0010] According to some embodiments of the utility model, a first flange extending horizontally is formed on the upper edge of the first partition, a first seal is provided on the first flange, and the first seal abuts between the first flange and the top wall of the box body.

[0011] According to some embodiments of the present invention, in the thickness direction of the first partition plate, the first flange extends toward a side away from the installation cavity.

[0012] According to some embodiments of the utility model, the first partition is provided with second flanges on both side edges in the horizontal direction, the second flanges extend toward the battery module along the thickness direction of the first partition, and the second flanges are sealed and connected to the battery module and the inner wall of the box body.

[0013] According to some embodiments of the utility model, the battery pack also includes: a second partition, the second partition is arranged in the box body, the installation cavity is defined between the first partition and the second partition, the side of the second partition facing away from the first partition is formed as a confluence cavity, the confluence cavity is connected with the liquid outlet, and a plurality of second through holes are formed on the second partition and penetrate the second partition along the thickness direction of the second partition, and the plurality of first through holes, the plurality of second through holes and the plurality of heat exchange channels correspond to each other one by one and are connected.

[0014] According to some embodiments of the utility model, the box body includes: a main box and a cover plate, the top of the main box is open, and the cover plate is arranged on the upper side of the main box and is detachably connected to the main box; or, there are multiple battery modules, and the multiple battery modules are arranged in sequence along a third direction.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front view of a battery pack according to an embodiment of the utility model;

[0017] Figure 2 yes Figure 1 A side view of a battery pack;

[0018] Figure 3 yes Figure 1 A top view of the battery pack shown;

[0019] Figure 4 yes Figure 3 The cross-sectional view of line AA in the figure;

[0020] Figure 5 yes Figure 4 A partial enlarged view of the point B indicated by the middle circle;

[0021] Figure 6 yes Figure 3 Cross-sectional view of line CC in;

[0022] Figure 7 yes Figure 6 A partial enlarged view of the point D indicated by the middle circle;

[0023] Figure 8 yes Figure 1 A schematic diagram of a main box, a first separator, a second separator and a battery module of a battery pack shown;

[0024] Fig. 9 yes Figure 8 A top view of the battery pack shown, wherein the battery pack does not include a cover plate;

[0025] Fig.10 yes Figure 8 A schematic diagram of a battery module, a first separator and a second separator is shown;

[0026] Fig.11 yes Fig.10 The main view of

[0027] Fig.12 yes Fig.10 Side view of

[0028] Fig.13 yes Fig.10 A schematic diagram of a first diaphragm and a first seal is shown;

[0029] Fig.14 yes Fig.10 A schematic diagram of the first separator is shown.

[0030] Reference numerals:

[0031] 100. Battery pack; 10. Box body; 11. Main box; 12. Cover plate; 13. Liquid inlet; 14. Liquid outlet; 20. First partition; 21. First flange; 22. First seal; 23. First through hole; 24. Second flange; 30. Second partition; 31. Second through hole; 32. Third flange; 33. Fourth flange; 34. Second seal; 40. Battery module; 41. Heat exchange channel; 42. Cylindrical battery; 50. Diverter cavity; 60. Converging cavity. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] Reference below Figure 1-Figure 14 A battery pack 100 according to an embodiment of the present invention is described.

[0034] According to the battery pack 100 of the embodiment of the present invention, the battery pack 100 includes: a box body 10 , a first partition 20 and a battery module 40 .

[0035] Reference Figure 8 As shown, a liquid inlet 13 and a liquid outlet 14 are formed on the box body 10; a first partition 20 is arranged in the box body 10, and a mounting cavity and a shunt cavity 50 are separated in the box body 10 and located on both sides of the thickness direction of the first partition 20, and the shunt cavity 50 is connected to the liquid inlet 13; a battery module 40 is arranged in the mounting cavity and includes a first direction (for example Figure 8 A plurality of battery packs are arranged in an interval manner along a second direction (eg, the vertical direction shown in FIG. Figure 8 A plurality of cylindrical batteries 42 are sequentially arranged in the front-to-back direction (shown in FIG. 1 ), and two adjacent battery packs cooperate to define a second direction (for example, Figure 8 The heat exchange flow channel 41 extends in the front-to-back direction (shown in FIG. 1 ), and the first direction (for example Figure 8 The up-down direction shown) is perpendicular to the second direction (eg Figure 8 wherein, the first baffle plate 20 is formed with a plurality of first through holes 23 that penetrate the first baffle plate 20 along the thickness direction of the first baffle plate 20, and the plurality of first through holes 23 correspond to and are connected with the plurality of heat exchange channels 41 one by one.

[0036] For example Figure 8As shown, the coolant flows into the diverter cavity 50 through the liquid inlet 13, and the coolant in the diverter cavity 50 is guided to the heat exchange channel 41 through the first through hole 23, and directly exchanges heat with the cylindrical battery 42 on the surface of the heat exchange channel 41. Then, the coolant carries the heat after the heat exchange with the cylindrical battery 42 and flows out of the heat exchange channel 41, and is discharged from the box body 10 through the liquid outlet 14.

[0037] The shunt chamber 50 is located at the front side of the installation chamber, and the installation chamber and the shunt chamber 50 are separated by the first partition 20. The liquid inlet 13 is connected to the installation chamber, so that the coolant can flow into the shunt chamber 50 through the liquid inlet 13. By arranging each cylindrical battery 42 of the battery pack in sequence along the second direction, and each battery pack is arranged at intervals along the first direction, a heat exchange channel 41 extending along the second direction can be formed between two adjacent battery packs, and the coolant flows backward along the second direction in the heat exchange channel 41. Since the heat exchange channel 41 has a regular shape and generally extends in a straight line, and the coolant in the heat exchange channel 41 is in direct contact with the cylindrical battery 42, the cooling effect of the cylindrical battery 42 can be improved, and the coolant in the heat exchange channel 41 can flow quickly, reduce the fluid resistance of the coolant, and thus improve the heat exchange rate and heat exchange efficiency of the battery pack 100.

[0038] The first partition plate 20 has a plurality of first through holes 23 that pass through the first partition plate 20 along the second direction, and the first through holes 23 correspond one-to-one to the heat exchange channels 41, which can ensure that the coolant in the diversion cavity 50 can only flow into the heat exchange channels 41 of the battery module 40, and has a diversion effect. Since the first through holes 23 correspond one-to-one to the heat exchange channels 41, the coolant flowing into the battery module 40 through the first through holes 23 can only flow into the heat exchange channels 41 corresponding to the first through holes 23, thereby avoiding the coolant flowing through the first through holes 23 to be diverted to other heat exchange channels 41, and avoiding the coolant flow rate to be reduced due to the increase in resistance loss along the way of the coolant, thereby ensuring that the flow rate of the coolant in the battery module 40 is within a reasonable flow rate range.

[0039] The first partition 20 separates the box body 10 into a diversion chamber 50 and an installation chamber. The multiple first through holes 23 on the first partition 20 correspond one-to-one to the heat exchange channel 41 extending along the second direction. The heat exchange channel 41 is directly defined between the two battery groups, so that the coolant can be guided to the heat exchange channel 41 through the first through holes 23 and directly contact the cylindrical batteries 42 on the surface of the heat exchange channel 41, which is beneficial to reduce the fluid resistance loss of the coolant, increase the flow rate of the coolant, and improve the effect of the coolant and the cylindrical batteries 42, thereby improving the cooling efficiency and cooling effect of the battery pack 100.

[0040] According to the battery pack 100 of the embodiment of the utility model, by setting a first partition 20, and setting first through holes 23 on the first partition 20 corresponding to the heat exchange channels 41 of the battery modules 40, when the battery pack 100 is working, the heat exchange medium in the diverter cavity 50 can enter the corresponding heat exchange channel 41 through the multiple first through holes 23 respectively, to achieve heat exchange with the battery cells on both sides of the heat exchange channel 41, wherein the multiple first through holes 23 can guide and divert the fluid in the diverter cavity 50, improve the flow efficiency of the fluid in the diverter cavity 50 to the heat exchange channel 41, and ensure the coolant flow in the heat exchange channel 41. At the same time, the heat exchange channel 41 is directly defined between the two battery groups, so that the heat exchange medium in the heat exchange channel 41 can directly contact the battery cells to achieve heat exchange, improve the heat exchange efficiency, and further improve the heat exchange efficiency and heat exchange rate of the battery pack 100.

[0041] According to some embodiments of the present invention, referring to Figure 7 As shown, in the direction from the installation cavity to the diversion cavity 50, the cross-sectional area of ​​the first through hole 23 gradually increases.

[0042] In this embodiment, by setting the cross-sectional area of ​​the first through hole 23 to gradually increase, the flow rate of the coolant flowing to the heat exchange channel 41 along the thickness direction of the first partition 20 close to the first partition 20 can be increased compared to the flow rate of the coolant at the end of the first through hole 23 along the thickness direction of the first partition 20 away from the battery module 40, thereby increasing the flow rate of the coolant in the heat exchange channel 41. At the same time, the cross-sectional area of ​​the first through hole 23 gradually increases, which can increase the cross-sectional area of ​​the end of the first through hole 23 facing the diverter cavity 50, thereby improving the diversion efficiency of the first through hole 23 to divert the coolant in the diverter cavity 50 to the heat exchange channel 41, thereby further improving the heat exchange efficiency inside the battery pack 100.

[0043] According to some embodiments of the present invention, referring to Figure 7 As shown, the circumference of the first through hole 23 is bent along an arc line toward one side of the installation cavity.

[0044] In this embodiment, by setting the peripheral edge of the first through hole 23 to be bent toward one side of the installation cavity, the inner wall of the first through hole 23 can be smoothly connected to the surface of the side of the first partition 20 facing the diversion cavity 50, so that the flow of coolant entering the first through hole 23 from the diversion cavity 50 can be smoother, thereby improving the diversion effect of the first through hole 23. At the same time, since a circular chamfer is formed at the first through hole 23, it is beneficial to reduce the erosion of the first through hole 23 by the fluid and increase the service life of the first through hole 23. In addition, the peripheral edge of the first through hole 23 is bent along an arc line toward one side of the installation cavity, so that the first partition 20 can use a smaller material thickness to achieve a better diversion effect, thereby reducing the material thickness of the first partition 20 and reducing the material cost.

[0045] According to some embodiments of the present invention, the first through hole 23 on the first partition plate 20 is formed by stamping.

[0046] The first through hole 23 of the present embodiment is formed by a stamping process, which has high production efficiency and stable production quality, and can also improve the mechanical properties of the material. It can improve the efficiency of producing the first through hole 23 on the first partition plate 20, and can improve the mechanical properties of the first through hole 23 on the first partition plate 20.

[0047] According to some embodiments of the present invention, the first through hole 23 is an oblong hole extending along the first direction.

[0048] In this embodiment, by setting the first through hole 23 as an oblong hole extending along the first direction, the first through hole 23 can be made regular in shape for easy processing and production. At the same time, the first through hole 23 can further improve the guiding effect of the coolant in the diversion cavity 50.

[0049] According to some embodiments of the present invention, a sealing gasket is provided around the first through hole 23 , and the sealing gasket extends along the circumference of the first through hole 23 and abuts between the first separator 20 and the battery module 40 .

[0050] The embodiment of the utility model can effectively prevent the coolant from leaking from the gap between the first partition 20 and the battery module 40 by arranging a sealing gasket around the first through hole 23 and the sealing gasket is located between the first partition 20 and the battery module 40, so that the coolant flowing through the first through hole 23 can only enter the heat exchange channel 41 corresponding to the first through hole 23, and exchange heat with the cylindrical battery 42 on the surface of the heat exchange channel 41, thereby improving the utilization rate of the coolant and making the battery pack 100 have a good cooling effect.

[0051] According to some embodiments of the present invention, a first flange 21 extending horizontally is formed on the upper edge of the first partition 20 , and a first seal 22 is provided on the first flange 21 . The first seal 22 abuts between the first flange 21 and the top wall of the box body 10 .

[0052] For example Figure 4 , Figure 5 and Figure 8 As shown, the box body 10 may include a cover plate 12 and a main box 11, and the first seal 22 is located between the top wall of the cover plate 12 of the box body 10 and the first flange 21, and the first seal 22 and the first flange 21 both extend in the left-right direction. By covering the cover plate 12 on the main box 11, the upper side plate of the cover plate 12 and the first flange 21 will press the first seal 22.

[0053] In this embodiment, by arranging the first sealing member 22 between the first flange 21 and the top wall of the box body 10, it is possible to prevent the coolant from leaking from the gap between the first flange 21 and the top wall of the box body 10, and to prevent the coolant from bypassing the heat exchange channel 41 and flowing to the tail of the heat exchange channel 41, thereby improving the utilization rate of the coolant and achieving a good cooling effect for the battery module 40.

[0054] According to some embodiments of the present invention, in the thickness direction of the first partition plate 20 , the first flange 21 extends toward a side away from the installation cavity.

[0055] In this embodiment, by setting the first flange 21 to extend along the thickness direction of the first partition 20 toward the side away from the installation cavity, the first flange 21 can avoid the battery module 40 located in the installation cavity, thereby avoiding interference between the first flange 21 and the battery module 40 during assembly or use of the battery pack 100, thereby making the layout of the first partition 20 more reasonable and effectively improving the space utilization rate in the box body 10. At the same time, the first partition 20 and the top wall of the box body 10 respectively abut the first sealing member 22, which can prevent the coolant from leaking from the gap between the first flange 21 and the top wall of the cover plate 12.

[0056] According to some embodiments of the utility model, the first partition 20 is provided with a second flange 24 on both side edges in the horizontal direction, and the second flange 24 extends toward the battery module 40 along the thickness direction of the first partition 20. The second flange 24 is sealed and connected to the battery module 40 and the inner wall of the box body 10.

[0057] For example Figure 8 and Fig.14 As shown, there is a second flange 24 on the left and right sides of the first partition 20, and the second flange 24 of the first partition 20 is folded back to be sealed and connected to the inner wall of the box body 10. In this embodiment, two second flanges 24 are respectively arranged on both sides of the first partition 20 in the horizontal direction, and the second flanges 24 are respectively sealed and connected to the inner wall of the box body 10, so that the first partition 20 can be easily assembled, and the second flange 24 can be sealed with the inner wall of the box body 10, so that the coolant can only enter the heat exchange channel 41 through the first through hole 23.

[0058] According to some embodiments of the utility model, the battery pack 100 may further include: a second partition 30, the second partition 30 is arranged in the box body 10, an installation cavity is defined between the first partition 20 and the second partition 30, the side of the second partition 30 facing away from the first partition 20 is formed as a confluence cavity 60, the confluence cavity 60 is connected to the liquid outlet 14, and a plurality of second through holes 31 are formed on the second partition 30 and pass through the second partition 30 along the thickness direction of the second partition 30, and the plurality of first through holes, the plurality of second through holes 31 and the plurality of heat exchange channels 41 correspond to each other one by one and are connected.

[0059] For example Figure 8 As shown, the second partition 30 is located at the rear side of the battery module 40, the front side of the second partition 30 contacts the rear side of the battery module 40, and the box body 10, the first partition 20 and the second partition 30 separate the diverter cavity 50, the installation cavity and the converging cavity 60 along the front-to-back direction. The first through hole 23 on the first partition 20 and the second through hole 31 on the second partition 30 correspond to the heat exchange flow channel 41 one by one, so that the coolant in the diverter cavity 50 can flow from the first through hole 23 into the corresponding heat exchange flow channel 41, and then flow into the converging cavity 60 through the corresponding second through hole 31.

[0060] The second partition 30 has a third flange 32 extending along the thickness direction of the second partition 30 toward the side away from the installation cavity. The third flange 32 extends along a third direction (for example, the left-right direction shown in the figure). At the same time, the second partition 30 has a fourth flange 33 extending along the thickness direction of the second partition 30 toward the side away from the confluence cavity 60. The fourth flange 33 is sealed to the inner wall of the box body 10. The second sealing member 34 is located between the third flange 32 and the top wall of the cover plate 12. The bottom surface of the battery module 40 is sealed to the bottom wall of the box body 10, for example, sealing can be performed by gluing.

[0061] The coolant enters the diverter cavity 50 through the liquid inlet 13, and the coolant in the diverter cavity 50 is guided to the heat exchange channel 41 by the first through hole 23, and exchanges heat with the cylindrical battery 42. Next, the coolant that has completed the heat exchange with the cylindrical battery 42 is guided to the confluence cavity 60 through the second through hole 31, and finally the coolant in the confluence cavity 60 is discharged from the confluence cavity 60 through the liquid outlet 14.

[0062] In this embodiment, a second partition 30 is provided, and second through holes 31 corresponding to the heat exchange channels 41 of the battery modules 40 are provided on the first partition 20. When the battery pack 100 is working, the coolant in the heat exchange channel 41 is drained to the confluence cavity 60 through the second through holes 31, which can further improve the flow efficiency of the coolant in the heat exchange channel 41 to the confluence cavity 60, thereby ensuring the coolant flow in the heat exchange channel 41. At the same time, the third flange 32 is sealed with the top wall of the cover plate 12, and the fourth flange 33 is sealed with the inner wall of the box body 10, so that the second partition 30 can prevent the coolant in the confluence cavity 60 from leaking into the battery module 40, thereby avoiding reducing the cooling effect of the battery pack 100.

[0063] According to some embodiments of the present invention, referring to Figure 4 As shown, the box body 10 may include: a main box 11 and a cover plate 12, the top of the main box 11 is open, the cover plate 12 is covered on the upper side of the main box 11 and is detachably connected to the main box 11; or, there are multiple battery modules 40, and the multiple battery modules 40 are arranged in sequence along a third direction.

[0064] In this embodiment, the cover plate 12 is covered on the upper side of the main box 11, and the cover plate 12 is detachably connected to the main box 11. For example, the cover plate 12 and the main box 11 can be connected by bolts, so that the first partition plate 20, the second partition plate 30 and the battery module 40 in the battery pack 100 can be easily assembled.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body, wherein a liquid inlet and a liquid outlet are formed on the box body; a first partition, the first partition being arranged in the box body and separating a mounting cavity and a diversion cavity located on both sides of the first partition in a thickness direction in the box body, the diversion cavity being connected to the liquid inlet; A battery module, the battery module is disposed in the mounting cavity and includes a plurality of battery packs arranged at intervals along a first direction, each of the battery packs includes a plurality of cylindrical batteries arranged in sequence along a second direction, and a heat exchange channel extending along the second direction is defined between two adjacent battery packs, and the first direction is perpendicular to the second direction; The first partition plate is provided with a plurality of first through holes penetrating the first partition plate along a thickness direction of the first partition plate, and the plurality of first through holes correspond to and are connected with the plurality of heat exchange channels one by one.

2. The battery pack according to claim 1, characterized in that: In a direction from the installation cavity to the diversion cavity, a cross-sectional area of ​​the first through hole gradually increases.

3. The battery pack according to claim 2, characterized in that: The periphery of the first through hole is bent along an arc line toward one side of the installation cavity.

4. The battery pack according to claim 3, characterized in that: The first through hole on the first partition is formed by stamping.

5. The battery pack according to claim 1, characterized in that: A sealing gasket is provided at the periphery of the first through hole. The sealing gasket extends along the circumference of the first through hole and abuts between the first separator and the battery module.

6. The battery pack according to claim 1, characterized in that: A first flange extending horizontally is formed on the upper edge of the first partition, a first sealing member is provided on the first flange, and the first sealing member abuts between the first flange and the top wall of the box body.

7. The battery pack according to claim 6, characterized in that: In the thickness direction of the first partition plate, the first flange extends toward a side away from the installation cavity.

8. The battery pack according to claim 1, characterized in that: The first partition is provided with second flanges on both side edges in the horizontal direction. The second flanges extend toward the battery module along the thickness direction of the first partition. The second flanges are sealed and connected to the battery module and the inner wall of the box.

9. The battery pack according to any one of claims 1 to 8, characterized in that: Also includes: a second partition, the second partition is arranged in the box body, the first partition and the second partition define the installation cavity, the side of the second partition away from the first partition is formed as a confluence cavity, and the confluence cavity is communicated with the liquid outlet, A plurality of second through holes penetrating the second partition plate along a thickness direction of the second partition plate are formed on the second partition plate, and the plurality of first through holes, the plurality of second through holes and the plurality of heat exchange channels correspond to each other and are connected.

10. The battery pack according to any one of claims 1 to 8, characterized in that: The box body includes: a main box and a cover plate, the top of the main box is open, and the cover plate is arranged on the upper side of the main box and is detachably connected to the main box; or, there are multiple battery modules, and the multiple battery modules are arranged in sequence along a third direction.

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