CN219892325U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, which includes: a battery box, a battery cell and a cooling system. The battery box includes a lower shell. The battery box has an accommodation cavity. The lower shell includes a casing surrounding the outer circumference of the accommodation cavity. Side beams, there are multiple battery cells and they are located in the accommodation cavity. The cooling system includes a liquid inlet pipe, a liquid outlet pipe, a liquid inlet and outlet assembly and a liquid cooling plate. The liquid cooling plate is located above or below the accommodation cavity. The liquid cooling The plate is used to cool the battery cells. The liquid cooling plate has a liquid inlet, a liquid outlet and a heat exchange flow channel connecting the liquid inlet and the liquid outlet. An installation cavity is formed in the side beam, and the cooling liquid is suitable for passing through The liquid inlet and outlet assembly flows into the liquid inlet, and the cooling liquid flowing out from the liquid outlet is suitable for flowing into the liquid inlet and outlet assembly. According to the battery pack of the present utility model, the overall power of the battery pack can be increased.

Description

battery pack

Technical field

The utility model relates to the field of batteries, in particular to a battery pack.

Background technique

In the related art, the liquid inlet and outlet assembly occupies a large amount of the internal space of the accommodation cavity of the battery pack, which reduces the space available for placing battery cells in the accommodation cavity, and is not conducive to increasing the overall power of the battery pack. Therefore, there is room for improvement.

Utility model content

The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to propose a battery pack in which a mounting cavity is formed in the side beam of the battery box. By locating at least part of the liquid inlet and outlet components in the mounting cavity, the amount of liquid inlet and outlet can be reduced. The internal space of the accommodation cavity occupied by the components increases the space available for placing battery cells in the accommodation cavity, thereby increasing the number of battery cells in the accommodation cavity, thereby increasing the overall power of the battery pack.

A battery pack according to an embodiment of the present invention includes: a battery box; the battery box includes a lower shell; the battery box has an accommodation cavity; the lower shell includes an outer peripheral side surrounding the accommodation cavity; side beams; battery cells, the battery cells are multiple and are located in the accommodation cavity; a cooling system, the cooling system includes a liquid inlet pipe, a liquid outlet pipe, a liquid inlet and outlet assembly and a liquid cooling plate, The liquid cooling plate is located above or below the accommodation cavity. The liquid cooling plate is used to cool the battery cells. The liquid cooling plate has a liquid inlet and a liquid outlet and is connected to the liquid inlet. The heat exchange flow channel between the inlet and the liquid outlet, an installation cavity is formed in the side beam, at least part of the inlet and outlet liquid assembly is located in the installation cavity, and the cooling liquid is suitable for passing through the inlet and outlet liquid The assembly flows into the liquid inlet, and the cooling liquid flowing out from the liquid outlet is suitable for flowing into the liquid inlet and outlet assembly.

According to the battery pack according to the embodiment of the present invention, an installation cavity is formed in the side beam of the battery box. By arranging at least part of the liquid inlet and outlet assembly in the installation cavity, the space occupied by the liquid inlet and outlet assembly can be reduced. The internal space increases the space available for arranging battery cells in the accommodating cavity, thereby increasing the number of battery cells in the accommodating cavity, thereby increasing the overall power of the battery pack.

According to some embodiments of the present invention, the cooling system includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet and outlet assembly has a liquid inlet flow channel and a liquid outlet flow channel. The liquid inlet pipe and the liquid outlet pipe are installed On the side beam and extending outward to the outside of the battery box, the liquid inlet flow channel connects the liquid inlet pipe and the liquid inlet, and the liquid outlet flow channel connects the liquid outlet pipe and the liquid inlet. The liquid outlet.

According to some optional embodiments of the present invention, the liquid inlet and outlet assembly includes at least one of the liquid inlet and outlet modules; wherein, when the liquid inlet and outlet assembly includes one of the liquid inlet and outlet modules, the liquid inlet flow channel and the liquid inlet and outlet The liquid inlet and outlet flow channels are formed in the liquid inlet and outlet modules; when the liquid inlet and outlet assembly includes two liquid inlet and outlet modules, one of the two liquid inlet and outlet modules is formed with the liquid inlet flow channel and the other one is formed with the liquid inlet and outlet flow channels. One is formed with the liquid outlet flow channel.

According to some optional embodiments of the present invention, the liquid cooling plate is disposed at the bottom of the lower housing and connected to the lower housing; and/or the liquid inlet and outlet module is connected to the liquid cooling plate .

According to some embodiments of the present invention, the projection of the liquid inlet and outlet assembly on the horizontal plane is a first projection, and the projection of the lower housing on the horizontal plane is a second projection, and the first projection does not exceed the second projection. Outer contour.

According to some embodiments of the present invention, a groove is formed on the inner wall of the side beam, and the groove constitutes at least part of the installation cavity.

According to some optional embodiments of the present invention, the side beams have first side beams and second side beams arranged oppositely along the first direction, and the groove is formed on the first side beam. medial wall;

Wherein, in the first direction, the width of the portion of the liquid inlet and outlet assembly located in the accommodation cavity is L1, and the width of the portion of the liquid inlet and outlet assembly located in the side beam is L2, and the L1 The ratio to the L2 ranges from 0.3 to 2.

According to some optional embodiments of the present invention, the side beams have first side beams and second side beams arranged oppositely along the first direction, and the groove is formed on the first side beam. medial wall;

In the first direction, the distance between the liquid inlet and outlet assembly and the live components in the accommodation cavity ranges from 5 to 200 mm.

According to some optional embodiments of the present invention, the liquid inlet and outlet assembly includes a liquid inlet and outlet module, the liquid inlet and outlet module has a liquid inlet flow channel and a liquid outlet flow channel, and the cooling system includes a liquid inlet pipe and a liquid outlet pipe, The liquid inlet flow channel communicates with the liquid inlet pipe and the liquid inlet, the liquid outlet flow channel communicates with the liquid outlet pipe and the liquid outlet, and at least part of the liquid inlet and outlet module is accommodated in the groove;

Wherein, the inner wall of the groove along the thickness direction of the side beam is an installation inner wall, a first through hole and a second through hole are formed on the installation inner wall, and the liquid inlet pipe is passed through the third through hole. A through hole is inserted into the liquid inlet flow channel, and the liquid outlet pipe is passed through the second through hole and inserted into the liquid outlet flow channel.

According to some optional embodiments of the present invention, a seal is provided between the installation inner wall and the liquid inlet and outlet module; and/or, a mounting hole is formed on the installation inner wall, and a fastener is passed through the Install the hole and penetrate the liquid inlet and outlet module.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 is a perspective view of a battery pack according to some embodiments of the present invention;

Figure 2 is a top view of a partial structure of the battery pack in Figure 1;

Figure 3 is a cross-sectional view of a partial structure of the battery pack in Figure 1;

Figure 4 is a perspective view of a partial structure of the battery pack in Figure 1;

Figure 5 is an exploded view of part of the structure of the battery pack in Figure 1;

FIG. 6 is an enlarged view of position A in FIG. 5 .

Reference signs:

100. Battery pack;

10. Battery box; 11. Accommodation cavity;

12. Lower shell; 13. Side beams; 14. Installation cavity; 15. Fasteners; 16. First side beam; 17. Second side beam;

18. Groove; 19. Installation inner wall; 20. First through hole; 21. Second through hole; 22. Installation hole;

23. Top cover;

31. Cooling system; 32. Liquid inlet pipe; 33. Liquid outlet pipe;

34. Liquid inlet and outlet assembly; 35. Liquid inlet and outlet module; 36. Liquid inlet flow channel; 37. Liquid outlet flow channel; 38. Seal; 39. Second mounting hole;

40. Liquid cooling plate; 41. Liquid inlet; 42. Liquid outlet; 43. Heat exchange flow channel;

50. Live parts.

Detailed ways

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and cannot be understood as limitations of the present invention.

The battery pack 100 according to the embodiment of the present invention is described below with reference to FIGS. 1-6 .

As shown in FIGS. 1 to 6 , a battery pack 100 according to an embodiment of the present invention includes a battery box 10 , a battery cell, and a cooling system 31 . The battery box 10 includes a lower case 12. The battery box 10 has an accommodating cavity 11. The lower case 12 includes side beams 13 surrounding the outer circumference of the accommodating cavity 11. There are a plurality of battery cells and they are arranged in the accommodating cavity. Within 11. The cooling system 31 includes a liquid inlet pipe 32, a liquid outlet pipe 33, a liquid inlet and outlet assembly 34 and a liquid cooling plate 40. The liquid cooling plate 40 is provided above or below the accommodation cavity 11. The liquid cooling plate 40 is used to cool the battery cells. The liquid cooling plate 40 has a liquid inlet 41, a liquid outlet 42, and a heat exchange flow channel 43 connecting the liquid inlet 41 and the liquid outlet 42. An installation cavity 14 is formed in the side beam 13 , and at least part of the liquid inlet and outlet assembly 34 is located in the installation cavity 14 . For example, a part of the liquid inlet and outlet assembly 34 is located in the installation cavity 14; for another example, the entire liquid inlet and outlet assembly 34 is located in the installation cavity 14. The cooling liquid is suitable to flow into the liquid inlet 41 through the liquid inlet and outlet assembly 34 , and the cooling liquid flowing out from the liquid outlet 42 is suitable to flow into the liquid inlet and outlet assembly 34 .

In the related art, the liquid inlet and outlet assembly 34 is generally disposed in the accommodation cavity 11 of the battery pack 100 or outside the battery box 10. When the liquid inlet and outlet assembly 34 is disposed in the accommodation cavity 11 of the battery pack 100, the liquid inlet and outlet assembly 34 occupies the accommodation cavity. 11 has a large internal space, which reduces the space for arranging battery cells in the accommodation cavity 11; when the liquid inlet and outlet assembly 34 is located outside the battery box 10, it takes up a lot of the external space of the battery box 10, which is not conducive to the battery. The package 100 is installed in conjunction with other parts of the vehicle body. An installation cavity 14 is formed in the side beam 13. By arranging at least part of the liquid inlet and outlet assembly 34 in the installation cavity 14, and a part of the liquid inlet and outlet assembly 34 located in the installation cavity 14, the occupation of the liquid inlet and outlet assembly 34 is reduced. The internal space of the accommodating cavity 11 increases the space available for placing battery cells in the accommodating cavity 11, and more battery cells can be installed in the accommodating cavity 11, thereby increasing the overall power of the battery pack 100.

In the coolant circulation of the cooling system 31, the coolant flows from the liquid inlet and outlet assembly 34 into the liquid inlet 41 of the liquid cooling plate 40. After the coolant flows into the liquid cooling plate 40, the battery cells can be cooled, and then the cooling liquid flows from the liquid outlet The port 42 flows into the liquid inlet and outlet assembly 34 . This arrangement has a simple structure and can have a better cooling effect on the battery cells.

Optionally, the battery box 10 may include a top cover 23 and a lower housing 12 . The top cover 23 covers the top of the lower housing 12 . The top cover 23 may protect the components in the accommodation cavity 11 .

According to the battery pack 100 of the embodiment of the present invention, an installation cavity 14 is formed in the side beam 13 in the battery box 10. By arranging at least part of the liquid inlet and outlet assembly 34 in the installation cavity 14, the inlet and outlet can be reduced. The internal space of the accommodating cavity 11 occupied by the liquid component 34 increases the space available for arranging battery cells in the accommodating cavity 11, thereby increasing the number of battery cells in the accommodating cavity 11, thereby improving the overall quality of the battery pack 100. Includes power.

According to some embodiments of the present invention, the cooling system 31 includes a liquid inlet pipe 32 and a liquid outlet pipe 33. The liquid inlet and outlet assembly 34 has a liquid inlet flow channel 36 and a liquid outlet flow channel 37. The liquid inlet pipe 32 and the liquid outlet pipe 33 are installed On the side beam 13 and extending outward to the outside of the battery box 10 , the liquid inlet flow channel 36 connects the liquid inlet pipe 32 and the liquid inlet 41 , and the liquid outlet flow channel 37 connects the liquid outlet pipe 33 and the liquid outlet 42 .

In the coolant circulation of the cooling system 31, the coolant flows from the liquid inlet pipe 32 into the liquid inlet flow channel 36 of the inlet and outlet liquid assembly 34, and then the coolant enters the exchanger from the liquid inlet flow channel 36 through the liquid inlet 41 of the liquid cooling plate 40. Hot runner 43. After the coolant enters the heat exchange channel 43, the battery cells can be cooled. Then the coolant enters the outlet channel 37 of the inlet and outlet assembly 34 from the heat exchange channel 43 through the outlet 42, and is finally cooled. The liquid flows out of the cooling system 31 from the liquid outlet channel 37 through the liquid outlet pipe 33 . This arrangement has a simple structure, facilitates the circulation of coolant, and can have a better cooling effect on the battery cells.

According to some embodiments of the present invention, with reference to Figures 3, 5 and 6, the liquid inlet and outlet assembly 34 includes at least one liquid inlet and outlet module 35, wherein when the liquid inlet and outlet assembly 34 includes one liquid inlet and outlet module 35, the liquid inlet and outlet flow channel 36 and the liquid outlet flow channel 37 are formed in the liquid inlet and outlet module 35; when the liquid inlet and outlet assembly 34 includes two liquid inlet and outlet modules 35, one of the two liquid inlet and outlet modules 35 is formed with a liquid inlet flow channel 36 and the other is formed with a liquid inlet and outlet flow channel 37. Outlet flow channel 37.

When the liquid inlet and outlet assembly 34 includes a liquid inlet and outlet module 35 , the cooling liquid flows from the liquid inlet pipe 32 into the liquid inlet flow channel 36 of the liquid inlet and outlet module 35 , and then the cooling liquid flows from the liquid inlet flow channel 36 into the liquid inlet of the liquid cooling plate 40 41. Then the cooling liquid flows from the liquid outlet 42 through the heat exchange flow channel 43 into the liquid outlet flow channel 37 of the liquid inlet and outlet module 35, and finally the cooling liquid flows out from the liquid outlet pipe 33;

When the liquid inlet and outlet assembly 34 includes two liquid inlet and outlet modules 35 , the liquid inlet and outlet module 35 formed with the liquid inlet flow channel 36 is the first liquid inlet & outlet module 35 , and the liquid inlet & outlet module 35 formed with the liquid outlet flow channel 37 is the second liquid inlet & outlet module 35 . Liquid module 35, the coolant flows from the liquid inlet pipe 32 into the liquid inlet flow channel 36 of the first liquid inlet and outlet module 35, and the coolant flows from the liquid inlet flow channel 36 into the liquid inlet 41 of the liquid cooling plate 40, and then the coolant is replaced by The hot runner 43 flows from the liquid outlet 42 into the liquid outlet channel 37 of the second liquid inlet and outlet module 35 , and finally the cooling liquid flows out from the liquid outlet pipe 33 .

When the liquid inlet and outlet assembly 34 includes multiple liquid inlet and outlet modules 35 , the cooling liquid can flow into the liquid cooling plate from the multiple liquid inlet and outlet modules 35 . When the cooling liquid flows out from the liquid cooling plate 40 , it can flow out from the multiple liquid inlet and outlet modules 35 .

It should be explained that in the description of the present invention, "plurality" means two or more.

This arrangement can adjust the positions of the liquid inlet flow channel 36 and the liquid outlet flow channel 37 of the liquid inlet and outlet module 35 according to the position of the liquid cooling plate 40, which facilitates the arrangement of the components of the battery pack 100 and is conducive to further rational use of the internal space of the battery pack 100. .

According to some optional embodiments of the present invention, referring to FIGS. 1 to 5 , the liquid inlet and outlet module 35 is connected to the side beam 13 through fasteners 15 . This arrangement has a simple structure, a stable and reliable connection, and can ensure a stable connection between the liquid inlet and outlet module 35 and the side beam 13 .

According to some optional embodiments of the present invention, referring to FIGS. 3-5 , the liquid cooling plate 40 is disposed at the bottom of the lower case 12 and connected to the lower case 12 . For example, the liquid cooling plate can be bonded to the lower case through an adhesive layer. The adhesive layer has sealing and adhesive properties. The liquid cooling plate 40 can be bonded to the lower case 12 through an adhesive layer to ensure that the liquid cooling plate 40 and the lower case 12; for another example, the liquid cooling plate 40 can be connected to the lower case 12 through welding. This arrangement can make the connection between the liquid cooling plate 40 and the lower case 12 more stable.

According to some optional embodiments of the present invention, the liquid inlet and outlet module 35 is connected to the side beam 13 through fasteners 15, and the liquid cooling plate 40 is provided at the bottom of the lower housing 12 and is bonded to the lower housing 12 through a glue layer. . If the liquid inlet and outlet module 35 and the side beam 13 are connected by welding, the heat generated by the welding will damage the glue layer and affect the sealing between the lower case 12 and the liquid cooling plate 40. The liquid inlet and outlet module 35 is set to pass the fastener. 15 is connected to the side beam 13 to prevent the heat generated by welding from damaging the glue layer, allowing the liquid inlet and outlet module 35 to be stably connected to the side beam 13, and further ensuring the sealing between the liquid cooling plate 40 and the lower case 12 sex.

According to some optional embodiments of the present invention, referring to Figures 5 and 6, the liquid inlet and outlet module 35 is connected to the liquid cooling plate 40. For example, the liquid inlet and outlet module 35 can be connected to the liquid cooling plate 40 by welding. This arrangement makes the connection stable and reliable, facilitates the connection between the liquid inlet and outlet module 35 and the liquid cooling plate 40, and can improve production efficiency.

Optionally, the liquid inlet and outlet module 35 is first welded and connected to the liquid cooling plate 40, so that the liquid inlet and outlet module 35 and the liquid cooling plate 40 become an integral part. The liquid cooling plate 40 is disposed at the bottom of the lower case 12 , and the liquid cooling plate 40 is bonded to the lower case 12 through a glue layer. First, the liquid inlet and outlet module 35 is welded to the liquid cooling plate 40, and then the liquid cooling plate 40 and the lower shell 12 are bonded through the adhesive layer. The heat generated by the welding will not affect the relationship between the liquid cooling plate 40 and the lower shell 12. The glue layer can ensure the sealing between the liquid cooling plate 40 and the lower case 12.

According to some embodiments of the present invention, the projection of the liquid inlet and outlet assembly 34 on the horizontal plane is the first projection, and the projection of the lower housing 12 on the horizontal plane is the second projection, and the first projection does not exceed the outer contour of the second projection. This arrangement ensures that when the liquid inlet and outlet assembly 34 is disposed on the lower case, the liquid inlet and outlet assembly 34 will not exceed the outer surface of the lower case 12 , and the liquid inlet and outlet assembly 34 will not occupy the external space of the battery box 10 , making it convenient for the battery pack to be connected with other components. Assembly of components.

According to some embodiments of the present invention, referring to FIGS. 3 and 4 , a groove 18 is formed on the inner wall of the side beam 13 , and the groove 18 constitutes at least part of the installation cavity 14 . For example, the groove 18 constitutes a part of the installation cavity 14; for another example, the groove 18 constitutes the entire installation cavity 14. This arrangement has a simple structure and is convenient for arranging at least part of the liquid inlet and outlet assembly 34 inside the side beam 13 .

According to some optional embodiments of the present invention, referring to Figure 3, the side beam 13 has a first side beam 16 and a second side beam 17 that are relatively arranged along a first direction (refer to the e1 direction in the drawing), The groove 18 is formed on the inner wall of the first side beam 16. In the first direction (refer to the e1 direction in the drawing), the width of the portion of the liquid inlet and outlet assembly 34 located in the accommodation cavity 11 is L1, and the liquid inlet and outlet assembly 34 has a width L1. The width of the portion 34 located within the side beam 13 is L2, and the ratio of L1 to L2 ranges from 0.3 to 2. Within this ratio range, the proportion of the part of the inlet and outlet assembly 34 located on the side beam 13 relative to the part of the inlet and outlet assembly 34 located in the accommodation cavity 11 is more appropriate. Within this ratio range, it is ensured that the coolant can flow from the inlet flow channel 36 to the outlet. The liquid flow channel 37 flows smoothly, so that the liquid inlet and outlet assembly 34 does not occupy too much internal space of the accommodation cavity 11 .

According to some optional embodiments of the present invention, referring to Figure 2, the side beam 13 has a first side beam 16 and a second side beam 17 that are relatively arranged along a first direction (refer to the e1 direction in the drawing), The groove 18 is formed on the inner wall of the first side beam 16 between the liquid inlet and outlet assembly 34 and the live component 50 in the accommodation cavity 11 in the first direction (refer to the e1 direction in the drawing). The distance L3 range is 5~200mm. For example, the liquid inlet and outlet assembly 34 is made of aluminum. The distance between the live component 50 in the accommodation cavity 11 and the fluid inlet and outlet assembly 34 is too close, and the high voltage on the live component 50 may penetrate the fluid inlet and outlet assembly 34, causing a safety accident. By setting the distance L3 between the liquid inlet and outlet assembly 34 and the live parts 50 in the accommodation cavity 11 to a range of 5 to 200 mm, it can be ensured that there will be no conduction between the liquid inlet and outlet assembly 34 and the live parts 50 , and it can be ensured that the liquid inlet and outlet assembly 34 and the live parts 50 are not electrically conductive. The safety of the component 50 can thereby reduce the safety risks of the battery pack 100 . For example, the live component 50 in the accommodation cavity 11 may be a high-voltage power distribution unit, a battery management system or a battery cell.

According to some optional embodiments of the present invention, referring to Figures 3 and 5, the liquid inlet and outlet assembly 34 includes a liquid inlet and outlet module 35. The liquid inlet and outlet channels 36 and 37 are both formed in the liquid inlet and outlet module 35. The cooling system 31 Including a liquid inlet pipe 32 and a liquid outlet pipe 33, the liquid inlet and outlet assembly 34 has a liquid inlet flow channel 36 and a liquid outlet flow channel 37. At least part of the liquid inlet and outlet module 35 is accommodated in the groove 18 .

Among them, the inner wall of the groove 18 along the thickness direction of the side beam 13 is the installation inner wall 19. The first through hole 20 and the second through hole 21 are formed on the installation inner wall 19, and the liquid inlet pipe 32 is passed through the first through hole. 20 and inserted into the liquid inlet flow channel 36 , the liquid outlet pipe 33 is passed through the second through hole 21 and inserted into the liquid outlet flow channel 37 . This arrangement allows the coolant to directly enter the inlet flow channel 36 from the liquid inlet pipe 32, and allows the coolant to directly enter the liquid outlet pipe 33 from the outlet flow channel 37. The structure is simple, convenient for the circulation of the coolant, and convenient for the liquid inlet pipe 32. The cooperative connection with the liquid inlet flow channel 36, the liquid outlet pipe 33 and the liquid outlet flow channel 37 can improve production efficiency.

According to some optional embodiments of the present invention, referring to FIG. 3 , a seal 38 is provided between the installation inner wall 19 and the liquid inlet and outlet module 35 . By providing the seal 38, the sealing performance between the installation inner wall 19 and the liquid inlet and outlet module 35 can be ensured, thereby improving the sealing performance of the battery pack 100.

According to some optional embodiments of the present invention, referring to FIGS. 3-5 , a mounting hole 22 is formed on the inner mounting wall 19 , and the fastener 15 is passed through the mounting hole 22 and penetrates into the liquid inlet and outlet module 35 . By providing the mounting holes 22, the fasteners 15 can be conveniently connected to the liquid inlet and outlet module 35 and the first side beam 16, so that the connection between the liquid inlet and outlet module 35 and the side beam 13 can be made more stable and firm.

Optionally, a second mounting hole 39 is formed on the liquid inlet and outlet module 35 , and the fastener 15 connects the liquid inlet and outlet module 35 to the first side beam 16 by passing through the mounting hole 22 and the second mounting hole 39 . For example, if there are three fasteners 15, there are also three mounting holes 22, and there are also three second mounting holes 39. The three fasteners 15 are respectively penetrated through the three mounting holes 22 and the three second mounting holes 39. Connect the liquid inlet and outlet module 35 to the first side beam 16 . For example, the fastener 15 can be a bolt, the mounting hole 22 can be a threaded hole, and the second mounting hole 39 can be a threaded hole. This arrangement has a simple structure, and the connection is convenient and stable.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like is intended to be incorporated into the description of the implementation. An example or example describes a specific feature, structure, material or characteristic that is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and changes can be made to these embodiments without departing from the principles and purposes of the present invention. Modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A battery pack, characterized in that it includes: A battery box, the battery box includes a lower shell, the battery box has a receiving cavity, and the lower shell includes side beams surrounding the outer peripheral side of the receiving cavity; Battery cells, there are a plurality of battery cells and they are arranged in the containing cavity; Cooling system, the cooling system includes a liquid inlet and outlet assembly and a liquid cooling plate. The liquid cooling plate is located above or below the accommodation cavity. The liquid cooling plate is used to cool the battery cells. The liquid cooling plate The cold plate has a liquid inlet, a liquid outlet and a heat exchange flow channel connecting the liquid inlet and the liquid outlet. An installation cavity is formed in the side beam, and at least part of the liquid inlet and outlet assembly is located In the installation cavity, the cooling liquid is suitable to flow into the liquid inlet through the liquid inlet and outlet assembly, and the cooling liquid flowing out from the liquid outlet is suitable to flow into the liquid inlet and outlet assembly. 2. The battery pack according to claim 1, wherein the cooling system includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet and outlet assembly has a liquid inlet flow channel and a liquid outlet flow channel, and the liquid inlet pipe And the liquid outlet pipe is installed on the side beam and extends outward to the outside of the battery box, the liquid inlet flow channel connects the liquid inlet pipe and the liquid inlet, and the liquid outlet flow channel Connect the liquid outlet pipe and the liquid outlet. 3. The battery pack according to claim 2, wherein the liquid inlet and outlet assembly includes at least one liquid inlet and outlet module; Wherein, when the liquid inlet and outlet assembly includes one liquid inlet and outlet module, the liquid inlet flow channel and the liquid outlet flow channel are both formed in the liquid inlet and outlet module; when the liquid inlet and outlet assembly includes two of the liquid inlet and outlet modules. When entering and exiting the liquid module, one of the two liquid inlet and outlet modules is formed with the liquid inlet flow channel and the other is formed with the liquid outlet flow channel. 4. The battery pack according to claim 3, wherein the liquid cooling plate is disposed at the bottom of the lower housing and connected to the lower housing; and/or the liquid inlet and outlet module is connected to the lower housing. Described liquid cooling plate connection. 5. The battery pack according to claim 1, wherein the projection of the liquid inlet and outlet assembly on the horizontal plane is a first projection, the projection of the lower housing on the horizontal plane is a second projection, and the first projection is not beyond the outer contour of the second projection. 6. The battery pack according to claim 1, wherein the inner side wall of the side beam is formed with a groove, and the groove constitutes at least part of the installation cavity. 7. The battery pack according to claim 6, wherein the side beams have a first side beam and a second side beam arranged oppositely along a first direction, and the groove is formed on the first side beam. The inner side wall of one side sill; Wherein, in the first direction, the width of the portion of the liquid inlet and outlet assembly located in the accommodation cavity is L1, and the width of the portion of the liquid inlet and outlet assembly located in the side beam is L2, and the L1 The ratio to the L2 ranges from 0.3 to 2. 8. The battery pack according to claim 6, wherein the side beams have a first side beam and a second side beam arranged oppositely along a first direction, and the groove is formed on the first side beam. The inner side wall of one side sill; In the first direction, the distance between the liquid inlet and outlet assembly and the live components in the accommodation cavity ranges from 5 to 200 mm. 9. The battery pack according to claim 6, wherein the liquid inlet and outlet assembly includes a liquid inlet and outlet module, the liquid inlet and outlet module has a liquid inlet flow channel and a liquid outlet flow channel, and the cooling system includes a liquid inlet pipe. and a liquid outlet pipe. The liquid inlet flow channel connects the liquid inlet pipe and the liquid inlet. The liquid outlet flow channel connects the liquid outlet pipe and the liquid outlet. At least one of the liquid inlet and outlet modules is partially received in said groove; Wherein, the inner wall of the groove along the thickness direction of the side beam is an installation inner wall, a first through hole and a second through hole are formed on the installation inner wall, and the liquid inlet pipe is passed through the third through hole. A through hole is inserted into the liquid inlet flow channel, and the liquid outlet pipe is passed through the second through hole and inserted into the liquid outlet flow channel. 10. The battery pack according to claim 9, characterized in that a seal is provided between the inner installation wall and the liquid inlet and outlet module; and/or an installation hole is formed on the inner installation wall, and a fastener is Pass through the installation hole and penetrate into the liquid inlet and outlet module.