CN219892325U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, comprising: the battery box body, battery monomer and cooling system, the battery box body includes the casing down, have in the battery box body and hold the chamber, the casing is including encircling the side rail that holds the periphery side in chamber down, battery monomer is a plurality of and locate and hold the intracavity, cooling system includes the feed liquor pipe, the drain pipe, business turn over liquid subassembly and liquid cooling board, the top or the below that hold the chamber is located to the liquid cooling board, the liquid cooling board is used for cooling down battery monomer, the liquid cooling board has the inlet, the heat transfer runner of liquid outlet and intercommunication inlet and liquid outlet, be formed with the installation cavity in the side rail, the cooling liquid is suitable for flowing into the inlet through business turn over liquid subassembly, the cooling liquid that flows out from the liquid outlet is suitable for flowing into business turn over liquid subassembly. According to the battery pack, the whole pack capacity of the battery pack can be improved.

Description

Battery pack

Technical Field

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

Background

In the related art, the liquid inlet and outlet assembly occupies more inner space of the accommodating cavity of the battery pack, so that the space available for arranging the battery cells in the accommodating cavity is reduced, and the whole pack electric quantity of the battery pack is not improved. Accordingly, improvements are needed.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery pack, in which a mounting cavity is formed in a side rail in a battery case, and at least a portion of a liquid inlet and outlet assembly is disposed in the mounting cavity, so that an internal space of a receiving cavity occupied by the liquid inlet and outlet assembly is reduced, a space available for disposing battery cells in the receiving cavity is increased, and thus, a number of battery cells in the receiving cavity is increased, and an overall charge amount of the battery pack is increased.

According to an embodiment of the present utility model, a battery pack includes: the battery box body comprises a lower shell, a containing cavity is formed in the battery box body, and the lower shell comprises a side beam encircling the outer periphery side of the containing cavity; the plurality of battery cells are arranged in the accommodating cavity; the cooling system comprises a liquid inlet pipe, a liquid outlet pipe, a liquid inlet and outlet component and a liquid cooling plate, wherein the liquid cooling plate is arranged above or below the accommodating cavity and is used for cooling the battery cells, the liquid cooling plate is provided with a liquid inlet, a liquid outlet and a heat exchange runner which is communicated with the liquid inlet and the liquid outlet, an installation cavity is formed in the side beam, at least part of the liquid inlet and outlet component is positioned in the installation cavity, cooling liquid is suitable for flowing into the liquid inlet through the liquid inlet and the liquid outlet component, and cooling liquid flowing out from the liquid outlet is suitable for flowing into the liquid inlet and outlet component.

According to the battery pack disclosed by the embodiment of the utility model, the side beam in the battery box body is internally provided with the mounting cavity, and at least part of the liquid inlet and outlet component is arranged in the mounting cavity, so that the internal space of the accommodating cavity occupied by the liquid inlet and outlet component can be reduced, and the space in the accommodating cavity, which can be used for arranging the battery cells, is increased, so that the number of the battery cells in the accommodating cavity can be increased, and the whole packing capacity of the battery pack can be improved.

According to some embodiments of the utility model, the cooling system comprises a liquid inlet pipe and a liquid outlet pipe, the liquid inlet and outlet assembly is provided with a liquid inlet flow passage and a liquid outlet flow passage, the liquid inlet pipe and the liquid outlet pipe are arranged on the side edge beam and extend outwards to the outside of the battery box, the liquid inlet flow passage is communicated with the liquid inlet pipe and the liquid inlet, and the liquid outlet flow passage is communicated with the liquid outlet pipe and the liquid outlet.

According to some alternative embodiments of the utility model, the fluid access assembly includes at least one fluid access module; when the liquid inlet and outlet assembly comprises one liquid inlet and outlet module, the liquid inlet flow channel and the liquid outlet flow channel are formed in the liquid inlet and outlet module; when the liquid inlet and outlet assembly comprises two liquid inlet and outlet modules, one liquid inlet channel and the other liquid outlet channel are formed in the two liquid inlet and outlet modules.

According to some alternative embodiments of the utility model, the liquid cooling plate is disposed at the bottom of the lower housing and connected with the lower housing; and/or the liquid inlet and outlet module is connected with the liquid cooling plate.

According to some embodiments of the utility model, 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 does not exceed the outer contour of the second projection.

According to some embodiments of the utility model, the inner side walls of the side beams are formed with grooves, which grooves constitute at least part of the mounting cavity.

According to some alternative embodiments of the present utility model, the side rail has a first side rail and a second side rail disposed opposite to each other in a first direction, and the groove is formed in an inner side wall of the first side rail;

in the first direction, the width of the liquid inlet and outlet component located in the accommodating cavity is L1, the width of the liquid inlet and outlet component located in the side beam is L2, and the ratio of L1 to L2 is in the range of 0.3-2.

According to some alternative embodiments of the present utility model, the side rail has a first side rail and a second side rail disposed opposite to each other in a first direction, and the groove is formed in an inner side wall of the first side rail;

in the first direction, the distance between the liquid inlet and outlet assembly and the charged component in the accommodating cavity is 5-200 mm.

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

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 in the installation inner wall, the liquid inlet pipe penetrates through the first through hole and is inserted into the liquid inlet flow channel, and the liquid outlet pipe penetrates through the second through hole and is inserted into the liquid outlet flow channel.

According to some alternative embodiments of the utility model, a sealing element is arranged between the installation inner wall and the liquid inlet and outlet module; and/or a mounting hole is formed on the mounting inner wall, and a fastener penetrates through the mounting hole and penetrates into the liquid inlet and outlet module.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a perspective view of a battery pack according to some embodiments of the present utility model;

fig. 2 is a top view of a part of the structure of the battery pack of fig. 1;

fig. 3 is a sectional view of a part of the structure of the battery pack of fig. 1;

fig. 4 is a perspective view of a partial structure of the battery pack of fig. 1;

fig. 5 is an exploded view of a part of the structure of the battery pack of fig. 1;

fig. 6 is an enlarged view at a in fig. 5.

Reference numerals:

100. a battery pack;

10. a battery case; 11. a receiving chamber;

12. a lower housing; 13. side beams; 14. a mounting cavity; 15. a fastener; 16. a first side rail; 17. a second side rail;

18. a groove; 19. installing an inner wall; 20. a first through hole; 21. a second through hole; 22. a mounting hole;

23. a top cover;

31. a cooling system; 32. a liquid inlet pipe; 33. a liquid outlet pipe;

34. a liquid inlet and outlet assembly; 35. a liquid inlet and outlet module; 36. a liquid inlet flow channel; 37. a liquid outlet channel; 38. a seal; 39. a second mounting hole;

40. a liquid cooling plate; 41. a liquid inlet; 42. a liquid outlet; 43. a heat exchange flow passage;

50. and a charging member.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

A battery pack 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 6.

As shown in fig. 1 to 6, a battery pack 100 according to an embodiment of the present utility model includes: battery case 10, battery cells, and cooling system 31. The battery case 10 includes a lower case 12, a housing chamber 11 is provided in the battery case 10, the lower case 12 includes a side beam 13 surrounding an outer peripheral side of the housing chamber 11, and a plurality of battery cells are provided in the housing chamber 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, wherein the liquid cooling plate 40 is disposed above or below the accommodating cavity 11, the liquid cooling plate 40 is used for cooling the battery unit, and the liquid cooling plate 40 has a liquid inlet 41, a liquid outlet 42, and a heat exchange flow channel 43 communicating the liquid inlet 41 with the liquid outlet 42. The side rail 13 has a mounting cavity 14 formed therein, and at least a portion of the liquid inlet and outlet assembly 34 is positioned within the mounting cavity 14. For example, a portion of the access module 34 is located within the mounting cavity 14; as another example, the access module 34 is entirely located within the mounting cavity 14. The cooling liquid is adapted to flow into the inlet 41 through the inlet and outlet assembly 34, and the cooling liquid flowing out of the outlet 42 is adapted to flow into the inlet and outlet assembly 34.

In the related art, the liquid inlet and outlet assembly 34 is generally disposed in the accommodating cavity 11 of the battery pack 100 or outside the battery case 10, and when the liquid inlet and outlet assembly 34 is disposed in the accommodating cavity 11 of the battery pack 100, the liquid inlet and outlet assembly 34 occupies more space inside the accommodating cavity 11, so that the space in which the battery cells can be disposed in the accommodating cavity 11 is reduced; when the liquid inlet and outlet assembly 34 is arranged outside the battery box 10, the liquid inlet and outlet assembly occupies more external space of the battery box 10, and is not beneficial to the matching installation of the battery pack 100 and other parts of the vehicle body. The side beam 13 is internally provided with the installation cavity 14, and at least part of the liquid inlet and outlet assembly 34 is arranged in the installation cavity 14, and part of the liquid inlet and outlet assembly 34 is arranged in the installation cavity 14, so that the internal space of the accommodating cavity 11 occupied by the liquid inlet and outlet assembly 34 is reduced, the space available for arranging the battery cells in the accommodating cavity 11 is increased, more battery cells can be arranged in the accommodating cavity 11, and the whole package capacity of the battery package 100 can be improved.

In the cooling fluid circulation of the cooling system 31, the cooling fluid flows into the fluid inlet 41 of the fluid cooling plate 40 from the fluid inlet/outlet assembly 34, and after flowing into the fluid cooling plate 40, the cooling fluid can cool the battery cells, and then flows into the fluid inlet/outlet assembly 34 from the fluid outlet 42. This setting simple structure can play better cooling effect to the battery monomer.

Alternatively, the battery case 10 may include a top cover 23 and a lower case 12, the top cover 23 is disposed on top of the lower case 12, and the top cover 23 may protect components in the accommodating chamber 11.

According to the battery pack 100 of the embodiment of the utility model, the side beams 13 in the battery box 10 are internally provided with the mounting cavities 14, and at least part of the liquid inlet and outlet assembly 34 is arranged in the mounting cavities 14, so that the internal space of the accommodating cavity 11 occupied by the liquid inlet and outlet assembly 34 can be reduced, the space in the accommodating cavity 11 for arranging the battery cells is increased, the number of the battery cells in the accommodating cavity 11 can be increased, and the whole package capacity of the battery pack 100 can be improved.

According to some embodiments of the present utility model, 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 channel 36 and a liquid outlet channel 37, the liquid inlet pipe 32 and the liquid outlet pipe 33 are mounted on the side beams 13 and extend outwards to the outside of the battery box 10, the liquid inlet channel 36 communicates with the liquid inlet pipe 32 and the liquid inlet 41, and the liquid outlet channel 37 communicates with the liquid outlet pipe 33 and the liquid outlet 42.

In the cooling liquid circulation of the cooling system 31, the cooling liquid flows into the liquid inlet channel 36 of the liquid inlet and outlet assembly 34 from the liquid inlet pipe 32, then the cooling liquid flows into the heat exchange channel 43 from the liquid inlet channel 36 through the liquid inlet 41 of the liquid cooling plate 40, the cooling liquid can cool the battery cells after entering the heat exchange channel 43, then the cooling liquid flows into the liquid outlet channel 37 of the liquid inlet and outlet assembly 34 from the heat exchange channel 43 through the liquid outlet 42, and finally the cooling liquid flows out of the cooling system 31 from the liquid outlet channel 37 through the liquid outlet pipe 33. This setting simple structure, the circulation of the coolant liquid of being convenient for can play better cooling effect to the battery monomer.

According to some embodiments of the present utility model, referring to fig. 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 channel 36 and the liquid outlet 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 outlet flow channel 37.

When the liquid inlet and outlet assembly 34 comprises a liquid inlet and outlet module 35, the cooling liquid flows into the liquid inlet channel 36 of the liquid inlet and outlet module 35 from the liquid inlet pipe 32, the cooling liquid flows into the liquid inlet 41 of the liquid cooling plate 40 from the liquid inlet channel 36, then the cooling liquid flows into the liquid outlet channel 37 of the liquid inlet and outlet module 35 from the liquid outlet 42 through the heat exchange channel 43, 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 with the liquid inlet channel 36 is the first liquid inlet and outlet module 35, the liquid inlet and outlet module 35 with the liquid outlet channel 37 is the second liquid inlet and outlet module 35, the cooling liquid flows into the liquid inlet channel 36 of the first liquid inlet and outlet module 35 from the liquid inlet pipe 32, the cooling liquid flows into the liquid inlet 41 of the liquid cooling plate 40 from the liquid inlet channel 36, the cooling liquid flows into the liquid outlet channel 37 of the second liquid inlet and outlet module 35 from the liquid outlet 42 through the heat exchange channel 43, and finally the cooling liquid flows out from the liquid outlet pipe 33.

When the liquid inlet and outlet assembly 34 includes a plurality of liquid inlet and outlet modules 35, the cooling liquid can flow into the liquid cooling plate from the plurality of liquid inlet and outlet modules 35, and the cooling liquid can flow out from the plurality of liquid inlet and outlet modules 35 when flowing out from the liquid cooling plate 40.

In the description of the present utility model, the meaning of "plurality of" means two or more.

The position of the liquid inlet channel 36 and the liquid outlet channel 37 of the liquid inlet and outlet module 35 can be adjusted according to the position of the liquid cooling plate 40, so that the arrangement of parts of the battery pack 100 is facilitated, and the internal space of the battery pack 100 is further reasonably utilized.

According to some alternative embodiments of the present utility model, referring to fig. 1-5, the fluid intake and exhaust module 35 is connected to the side rail 13 by fasteners 15. The device has simple structure, stable and reliable connection and can ensure the stable connection between the liquid inlet and outlet module 35 and the side beam 13.

According to some alternative embodiments of the present utility model, referring to fig. 3-5, a liquid cooling plate 40 is provided at the bottom of the lower housing 12 and is connected to the lower housing 12. For example, the liquid cooling plate may be adhered to the lower housing through a glue layer, the glue layer has sealing property and adhesion property, and the liquid cooling plate 40 is adhered to the lower housing 12 through the glue layer, so that the sealing property between the liquid cooling plate 40 and the lower housing 12 can be ensured; for another example, the liquid cooling plate 40 may be connected to the lower housing 12 by welding, and this arrangement may make the connection of the liquid cooling plate 40 to the lower housing 12 more stable.

According to some alternative embodiments of the present utility model, the liquid inlet and outlet module 35 is connected to the side rail 13 by the fastener 15, and the liquid cooling plate 40 is disposed at the bottom of the lower case 12 and is bonded to the lower case 12 by a glue layer. If the liquid inlet and outlet module 35 is connected with the side beam 13 through welding, heat generated by welding can damage the adhesive layer, the tightness between the lower shell 12 and the liquid cooling plate 40 is affected, the liquid inlet and outlet module 35 is connected with the side beam 13 through the fastener 15, the adhesive layer can be prevented from being damaged by heat generated by welding, and the tightness between the liquid cooling plate 40 and the lower shell 12 is further ensured while the liquid inlet and outlet module 35 and the side beam 13 can be stably connected.

According to some alternative embodiments of the present utility model, referring to fig. 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 with the liquid cooling plate 40 by welding, the arrangement is stable and reliable, the connection between the liquid inlet and outlet module 35 and the liquid cooling plate 40 is convenient, and the production efficiency can be improved.

Alternatively, the liquid inlet and outlet module 35 is welded to the liquid cooling plate 40, so that the liquid inlet and outlet module 35 and the liquid cooling plate 40 are integrated. The liquid cooling plate 40 is disposed at the bottom of the lower housing 12, and the liquid cooling plate 40 is bonded to the lower housing 12 through a glue layer. The liquid inlet and outlet module 35 is welded with the liquid cooling plate 40, then the liquid cooling plate 40 is bonded with the lower shell 12 through the adhesive layer, the adhesive layer between the liquid cooling plate 40 and the lower shell 12 is not affected by heat generated by welding, and the tightness between the liquid cooling plate 40 and the lower shell 12 can be ensured.

According to some embodiments of the present utility model, the projection of the liquid inlet and outlet assembly 34 on the horizontal plane is a first projection, and the projection of the lower housing 12 on the horizontal plane is a second projection, the first projection not exceeding the outer contour of the second projection. When the liquid inlet and outlet assembly 34 is arranged on the lower shell, the liquid inlet and outlet assembly 34 cannot exceed the outer surface of the lower shell 12, the liquid inlet and outlet assembly 34 cannot occupy the outer space of the battery box 10, and the assembly of the battery pack and other parts is facilitated.

According to some embodiments of the present utility model, referring to fig. 3 and 4, the inner side wall of the side rail 13 is formed with a groove 18, the groove 18 constituting at least part of the mounting cavity 14. For example, the recess 18 forms part of the mounting cavity 14; as another example, the grooves 18 constitute the entirety of the mounting cavity 14. This arrangement is simple in construction and facilitates locating at least a portion of the liquid inlet and outlet assembly 34 within the side rail 13.

According to some alternative embodiments of the present utility model, referring to fig. 3, the side rail 13 has a first side rail 16 and a second side rail 17 disposed opposite to each other in a first direction (referring to the e1 direction in the drawing), and the groove 18 is formed in an inner sidewall of the first side rail 16, wherein a width of a portion of the liquid inlet and outlet assembly 34 located in the receiving chamber 11 is L1, a width of a portion of the liquid inlet and outlet assembly 34 located in the side rail 13 is L2, and a ratio of L1 to L2 ranges from 0.3 to 2. The proportion of the part of the liquid inlet and outlet component 34 positioned on the side beam 13 relative to the part of the liquid inlet and outlet component 34 positioned on the accommodating cavity 11 is proper in the ratio range, and the smooth circulation of the cooling liquid from the liquid inlet channel 36 and the liquid outlet channel 37 is ensured in the ratio range, so that the liquid inlet and outlet component 34 does not occupy too much inner space of the accommodating cavity 11.

According to some alternative embodiments of the present utility model, referring to fig. 2, the side beam 13 has a first side beam 16 and a second side beam 17 disposed opposite to each other in a first direction (referring to the e1 direction in the drawing), the groove 18 is formed in an inner sidewall of the first side beam 16, and a distance L3 between the liquid inlet and outlet assembly 34 and the charging member 50 in the receiving chamber 11 in the first direction (referring to the e1 direction in the drawing) ranges from 5 to 200mm. For example, the material of the liquid inlet and outlet module 34 is aluminum. The charged member 50 in the accommodating chamber 11 is too close to the liquid inlet and outlet assembly 34, and the high voltage on the charged member 50 may break through the liquid inlet and outlet assembly 34, resulting in a safety accident. The distance L3 between the liquid inlet and outlet assembly 34 and the charging component 50 in the accommodating cavity 11 is set to be 5-200 mm, so that the liquid inlet and outlet assembly 34 and the charging component 50 can be prevented from conducting electricity, the safety of the liquid inlet and outlet assembly 34 and the charging component 50 can be ensured, and the potential safety hazard of the battery pack 100 can be reduced. For example, the charging member 50 in the housing chamber 11 may be a high voltage power distribution unit, a battery management system, or a battery cell.

According to some alternative embodiments of the present utility model, referring to fig. 3 and 5, the liquid inlet and outlet assembly 34 includes a liquid inlet and outlet module 35, a liquid inlet channel 36 and a liquid outlet channel 37 are formed in the liquid inlet and outlet module 35, the cooling system 31 includes a liquid inlet pipe 32 and a liquid outlet pipe 33, and the liquid inlet and outlet assembly 34 includes the liquid inlet channel 36 and the liquid outlet channel 37. At least part of the liquid inlet and outlet module 35 is accommodated in the groove 18.

The inner wall of the groove 18 along the thickness direction of the side beam 13 is an installation inner wall 19, a first through hole 20 and a second through hole 21 are formed on the installation inner wall 19, the liquid inlet pipe 32 is arranged through the first through hole 20 and inserted into the liquid inlet channel 36, and the liquid outlet pipe 33 is arranged through the second through hole 21 and inserted into the liquid outlet channel 37. This setting makes the coolant liquid can directly get into inlet channel 36 from inlet channel 32, makes the coolant liquid can directly get into drain pipe 33 from outlet channel 37, simple structure, and the circulation of convenient coolant liquid makes things convenient for inlet channel 32 and inlet channel 36, drain pipe 33 and outlet channel 37's cooperation to be connected, can improve production efficiency.

According to some alternative embodiments of the utility model, referring to fig. 3, a seal 38 is provided between the mounting inner wall 19 and the access module 35. By providing the seal member 38, the sealability between the mounting inner wall 19 and the liquid inlet and outlet module 35 can be ensured, so that the sealability of the battery pack 100 can be improved.

According to some alternative embodiments of the present utility model, referring to fig. 3-5, mounting holes 22 are formed in the mounting inner wall 19, and fasteners 15 are disposed through the mounting holes 22 and into the liquid inlet and outlet modules 35. By providing the mounting holes 22, the fastener 15 is convenient to connect the liquid inlet and outlet module 35 with the first side beam 16, so that the liquid inlet and outlet module 35 and the side beam 13 can be connected more stably and firmly.

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 with the first side rail 16 by penetrating through the mounting hole 22 and the second mounting hole 39. For example, if there are three fasteners 15, there are three mounting holes 22, three second mounting holes 39, and three fasteners 15 connect the liquid inlet and outlet module 35 with the first side rail 16 by penetrating through the three mounting holes 22 and the three second mounting holes 39, respectively. For example, the fastener 15 may be a bolt, the mounting hole 22 may be a threaded hole, and the second mounting hole 39 may be a threaded hole.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery pack, comprising:

the battery box body comprises a lower shell, a containing cavity is formed in the battery box body, and the lower shell comprises a side beam encircling the outer periphery side of the containing cavity;

the plurality of battery cells are arranged in the accommodating cavity;

the cooling system comprises a liquid inlet and outlet assembly and a liquid cooling plate, wherein the liquid cooling plate is arranged above or below the accommodating cavity and is used for cooling the battery cells, the liquid cooling plate is provided with a liquid inlet, a liquid outlet and a heat exchange runner which is communicated with the liquid inlet and the liquid outlet, an installation cavity is formed in the side beam, at least part of the liquid inlet and outlet assembly is positioned in the installation cavity, cooling liquid is suitable for flowing into the liquid inlet through the liquid inlet and outlet assembly, and cooling liquid flowing out from the liquid outlet is suitable for flowing into the liquid inlet and outlet assembly.

2. The battery pack of claim 1, wherein the cooling system comprises a liquid inlet pipe and a liquid outlet pipe, the liquid inlet and outlet assembly comprises a liquid inlet flow passage and a liquid outlet flow passage, the liquid inlet pipe and the liquid outlet pipe are arranged on the side beams and extend outwards to the outside of the battery box, the liquid inlet flow passage is communicated with the liquid inlet pipe and the liquid inlet, and the liquid outlet flow passage is communicated with the liquid outlet pipe and the liquid outlet.

3. The battery pack of claim 2, wherein the fluid access assembly comprises at least one fluid access module;

when the liquid inlet and outlet assembly comprises one liquid inlet and outlet module, the liquid inlet flow channel and the liquid outlet flow channel are formed in the liquid inlet and outlet module; when the liquid inlet and outlet assembly comprises two liquid inlet and outlet modules, one liquid inlet channel and the other liquid outlet channel are formed in the two liquid inlet and outlet modules.

4. The battery pack according to claim 3, wherein the liquid cooling plate is provided at the bottom of the lower case and connected to the lower case; and/or the liquid inlet and outlet module is connected with the liquid cooling plate.

5. The battery pack of 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 does not exceed an outer contour of the second projection.

6. The battery pack of claim 1, wherein the side rail inner side wall is formed with a groove that constitutes at least part of the mounting cavity.

7. The battery pack of claim 6, wherein the side rail has a first side rail and a second side rail disposed opposite in a first direction, the groove being formed in an inner side wall of the first side rail;

in the first direction, the width of the liquid inlet and outlet component located in the accommodating cavity is L1, the width of the liquid inlet and outlet component located in the side beam is L2, and the ratio of L1 to L2 is in the range of 0.3-2.

8. The battery pack of claim 6, wherein the side rail has a first side rail and a second side rail disposed opposite in a first direction, the groove being formed in an inner side wall of the first side rail;

in the first direction, the distance between the liquid inlet and outlet assembly and the charged component in the accommodating cavity is 5-200 mm.

9. The battery pack of claim 6, wherein the liquid inlet and outlet assembly comprises a liquid inlet and outlet module having a liquid inlet channel and a liquid outlet channel, the cooling system comprising a liquid inlet pipe and a liquid outlet pipe, the liquid inlet channel communicating the liquid inlet pipe with the liquid inlet, the liquid outlet channel communicating the liquid outlet pipe with the liquid outlet, at least a portion of the liquid inlet and outlet module being received in the recess;

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 in the installation inner wall, the liquid inlet pipe penetrates through the first through hole and is inserted into the liquid inlet flow channel, and the liquid outlet pipe penetrates through the second through hole and is inserted into the liquid outlet flow channel.

10. The battery pack of claim 9, wherein a seal is provided between the mounting inner wall and the access module; and/or a mounting hole is formed on the mounting inner wall, and a fastener penetrates through the mounting hole and penetrates into the liquid inlet and outlet module.