CN220527010U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, which comprises: the shell is provided with an installation cavity, a first channel and a second channel are respectively arranged in two opposite side walls of the shell along a first direction, the first channel and the second channel are both communicated with the installation cavity, one of the first channel and the second channel is provided with a liquid inlet, and the other one is provided with a liquid outlet; the battery module is arranged in the mounting cavity and comprises a plurality of battery cells which are arranged along a second direction, the second direction is perpendicular to the first direction, and a third channel which extends along the first direction is formed in the shell of the battery cells. According to the battery pack disclosed by the utility model, the cooling effect on the battery cells is good, the structural complexity is reduced, and the production cost can be reduced.

Description

Battery pack

Technical Field

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

Background

In the related art, the battery pack has a complex structure for cooling the battery core, increases the occupied space, improves the production cost, has poor cooling effect, and cannot meet the required cooling requirement.

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 that has a good cooling effect on a battery cell, and that has a reduced structural complexity and can reduce production costs.

According to an embodiment of the present utility model, a battery pack includes: the shell is provided with an installation cavity, a first channel and a second channel are respectively arranged in two opposite side walls of the shell along a first direction, the first channel and the second channel are communicated with the installation cavity, one of the first channel and the second channel is provided with a liquid inlet, and the other one of the first channel and the second channel is provided with a liquid outlet; the battery module is arranged in the mounting cavity and comprises a plurality of battery cells which are arranged along a second direction, the second direction is perpendicular to the first direction, and a third channel which extends along the first direction is formed in a shell of the battery cells.

According to the battery pack disclosed by the embodiment of the utility model, the first channel and the second channel are respectively arranged in the two opposite side walls of the shell along the first direction, the first channel and the second channel are both communicated with the mounting cavity, the battery module is arranged in the mounting cavity and comprises a plurality of electric cores distributed along the second direction, and the shell of each electric core is provided with the third channel extending along the first direction, so that cooling liquid can enter the third channel to cool the electric core, the immersed cooling of the electric cores is realized, the contact area of the cooling liquid and the shell is increased, the good flowing effect of the cooling liquid between the electric cores is ensured, the cooling efficiency of the electric cores is effectively improved, the cooling effect of the electric cores is ensured, the cooling requirement of the battery pack is met, the structural complexity of the battery pack is reduced, the complexity in assembly is reduced, the production cost is reduced, and the required occupied space is reduced.

In addition, the battery pack according to the above-described embodiment of the present utility model may have the following additional technical features:

according to some embodiments of the utility model, the third channel is formed on a plane perpendicular to the second direction of the housing, and the plane perpendicular to the second direction of the housing is a surface with the largest area on the housing.

According to some embodiments of the utility model, a first communication hole and a second communication hole are respectively arranged on one side, close to the battery cell, of two side walls, opposite to each other along the first direction, of the shell, the first communication hole is used for communicating the mounting cavity and the first channel, and the second communication hole is used for communicating the mounting cavity and the second channel.

According to some embodiments of the utility model, the first communication holes are a plurality of the first communication holes arranged at intervals along the second direction, the second communication holes are a plurality of the second communication holes arranged at intervals along the second direction, and any two adjacent electric cores are opposite to at least one first communication hole; and/or, any two adjacent cells are opposite to at least one second communication hole.

According to some embodiments of the utility model, the third channel is a plurality of third channels arranged at intervals along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

According to some embodiments of the utility model, the cell comprises a pole piece, the pole piece being located inside the housing, the housing comprising: two cell end caps; the battery cell shell body, the battery cell shell body encircles the periphery side of pole piece, two the battery cell end cover is located respectively the battery cell shell body is followed the both ends of first direction and connection, the third passageway is located on the battery cell shell body.

According to some embodiments of the utility model, the cell housing body is a single piece.

According to some embodiments of the utility model, the housing comprises: a first cover and a second cover; the shell body, first lid with the second lid is located respectively the shell body is along the both sides of third direction and connect in order to inject the installation cavity, the shell body includes two edges that follow the first direction is spaced apart and two edges that the second direction is spaced apart the end cover, two edges along the both ends of second direction respectively with same side the end cover is connected, first passageway with the second passageway is located respectively on the two edges.

According to some embodiments of the utility model, the battery pack further comprises: the bottom plate, the bottom plate is located the one side along the third direction of battery module just locates battery module with between the casing, have the fourth passageway in the bottom plate, the fourth passageway with the installation cavity intercommunication.

According to some embodiments of the utility model, a thermal insulation member is disposed between two adjacent cells.

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 an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic structural view of a battery module of a battery pack according to an embodiment of the present utility model;

fig. 3 is an exploded view of the battery cell of the battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a battery case body of a battery pack according to an embodiment of the present utility model;

fig. 5 is a partial structural schematic view of a case body of a battery pack according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of an edge beam of a battery pack according to an embodiment of the present utility model;

fig. 7 is a schematic structural view of a bottom plate of a battery pack according to an embodiment of the present utility model.

Reference numerals:

100. a battery pack;

10. a housing; 11. a mounting cavity; 12. a first cover; 13. a second cover; 14. a housing body; 141. edge beams; 142. an end cap;

20. a battery module; 21. a battery cell; 211. a housing; 212. a third channel; 213. a cell end cap; 214. a cell housing body; 215. a pole piece;

31. a first channel; 32. a second channel; 33. a liquid inlet; 34. a liquid outlet; 311. a first communication hole; 321. a second communication hole;

40. a bottom plate; 41. a fourth channel;

50. and a heat insulating 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.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, "a first feature" may include one or more such features, and "a plurality" may mean two or more, and that a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween, with the first feature "above", "over" and "above" the second feature including both the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.

A battery pack 100 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

Referring to fig. 1 and 2, a battery pack 100 according to an embodiment of the present utility model may include: the case 10 and the battery module 20.

Specifically, the casing 10 has a mounting cavity 11, the battery module 20 is disposed in the mounting cavity 11, the battery module 20 includes a plurality of (greater than or equal to two) battery cells 21, the plurality of battery cells 21 are arranged along a second direction (e.g., a left-right direction as shown in fig. 1), the plurality of battery cells 21 can be protected by the casing 10, damage caused by exposure of the battery cells 21 is avoided, and use safety of the battery pack 100 is ensured.

The casing 10 has a first channel 31 and a second channel 32 in opposite side walls along a first direction (for example, the front-rear direction shown in fig. 1), the second direction is perpendicular to the first direction, the first channel 31 and the second channel 32 are both communicated with the installation cavity 11, a liquid inlet 33 is formed in the first channel 31, and a liquid outlet 34 is formed in the second channel 32. From this, the coolant can flow into first passageway 31 through inlet 33 to get into through first passageway 31 and cool off electric core 21 in the installation cavity 11, and the coolant can flow from liquid outlet 34 through second passageway 32, realizes the circulation flow of coolant, and the coolant can directly contact the shell 211 of electric core 21, realizes the submergence cooling to electric core 21, ensures that the cooling effect to electric core 21 is good, can improve the cooling efficiency to electric core 21, satisfies the cooling demand of battery package 100.

Of course, the liquid inlet 33 may also be disposed on the second channel 32, and the liquid outlet 34 is disposed on the first channel 31, which is also within the protection scope of the present utility model.

The inventor of the present application found that in order to maintain a good flowing effect of the cooling liquid between the cells 21, a flow guiding structure, such as a special-shaped partition plate, a limiting strip, etc., needs to be disposed between two adjacent cells 21, but the processing complexity of the flow guiding structure is relatively high, and the production cost is increased.

Therefore, in order to maintain a good flowing effect of the cooling liquid between the battery cells 21 and reduce the production cost, in the present utility model, as shown in fig. 2-4, the housing 211 of the battery cell 21 is provided with the third channel 212, and the third channel 212 extends along the first direction, so that the cooling liquid entering the mounting cavity 11 can enter the third channel 212 to cool the battery cell 21, thereby increasing the contact area between the cooling liquid and the housing 211 and effectively improving the cooling efficiency of the battery cell 21. Meanwhile, by arranging the third channel 212 on the housing 211, the flow guide structure and the battery cell 21 are integrated, the housing 211 can provide a flow channel for cooling liquid, so that good flowing effect of the cooling liquid between the battery cells 21 is ensured, meanwhile, the complexity of the structure caused by adopting an independent flow guide structure is avoided, the structural complexity of the battery pack 100 is effectively reduced, the complexity degree during assembly is reduced, the production cost is reduced, and the required occupied space is reduced.

For convenience of description, the directions of the present utility model, such as "left and right direction", "front and rear direction", and "up and down direction", are based on the positional relationship shown in the drawings, and are not limited to the directions in the practical application process.

In some embodiments, the liquid outlet 34 may be communicated with a condenser, the liquid inlet 33 may be communicated with a driving component, and the condenser is communicated with the driving component, so that the driving component may drive the cooling liquid to enter the battery pack 100 from the liquid inlet 33, and drive the cooling liquid in the battery pack 100 to flow into the condenser from the liquid outlet 34, so that the cooling liquid can be cooled through the condenser, and the cooling liquid can enter the battery pack 100 again from the liquid inlet 33 after passing through the driving component, and circulate in sequence, thereby ensuring good cooling effect on the battery core 21, improving cooling efficiency on the battery pack 100, and prolonging service life of the battery pack 100. For example, the driving member may be a circulation pump.

According to the battery pack 100 of the embodiment of the utility model, the first channel 31 and the second channel 32 are respectively arranged in two opposite side walls of the casing 10 along the first direction, the first channel 31 and the second channel 32 are both communicated with the mounting cavity 11, the battery module 20 is arranged in the mounting cavity 11, the battery module 20 comprises a plurality of battery cells 21 distributed along the second direction, the shell 211 of the battery cells 21 is provided with the third channel 212 extending along the first direction, so that cooling liquid can enter the third channel 212 to cool the battery cells 21, the immersed cooling of the battery cells 21 is realized, the contact area of the cooling liquid and the shell 211 is increased, the good flowing effect of the cooling liquid between the battery cells 21 is ensured, the cooling efficiency of the battery cells 21 is effectively improved, the cooling effect of the battery cells 21 is ensured, the cooling requirement of the battery pack 100 is met, the structural complexity of the battery pack 100 is reduced, the complexity during assembly is reduced, the production cost is reduced, and the required occupied space is reduced.

In some embodiments of the present utility model, as shown in fig. 2-4, the plane of the housing 211 perpendicular to the second direction is provided with the third channel 212, so that the cooling liquid can enter the third channel 212 and flow out of the third channel 212 more smoothly, the flowing effect of the cooling liquid is good, and the plane of the housing 211 perpendicular to the second direction is the surface of the housing 211 with the largest area, so that the cooling liquid can cool the surface of the battery core 21 with the largest area, thereby ensuring the good cooling effect on the battery core 21 and being beneficial to improving the cooling efficiency on the battery core 21.

According to some embodiments of the present utility model, as shown in fig. 1, 5 and 6, a first communication hole 311 and a second communication hole 321 are respectively provided on one side, close to the battery core 21, of two opposite side walls of the housing 10 along the first direction, where the first communication hole 311 is used for communicating the mounting cavity 11 and the first channel 31, so that the first channel 31 can be communicated with the mounting cavity 11, the second communication hole 321 is used for communicating the mounting cavity 11 and the second channel 32, so that the second channel 32 can be communicated with the mounting cavity 11, so that the housing 10 is simple in structure, and convenient to manufacture the housing 10, which is beneficial to reducing the structural complexity of the housing 10, making the flow of the cooling liquid smooth, and ensuring a good cooling effect. For example, the first communication hole 311 and the second communication hole 321 may be formed as rectangular holes, which are convenient to manufacture and process, and can increase the flow rate of the cooling liquid into or out of the mounting chamber 11 while securing structural strength, satisfying the required cooling requirement.

In some embodiments of the present utility model, as shown in fig. 5 and 6, the number of the first communication holes 311 is plural (two or more), the plurality of the first communication holes 311 are arranged at intervals along the second direction, the number of the second communication holes 321 is plural (two or more), the plurality of the second communication holes 321 are arranged at intervals along the second direction, the flow rate of the cooling liquid flowing into or out of the mounting cavity 11 can be increased through the plurality of the first communication holes 311 and the plurality of the second communication holes 321, and the cooling of the battery cells 21 arranged at different positions along the second direction is facilitated, which is beneficial to improving the cooling efficiency and ensuring the good cooling effect of the battery cells 21.

In addition, the space between any two adjacent cells 21 is opposite to at least one first communication hole 311, so that the cooling liquid flows into the third channels 212 of the two adjacent cells 21 after being split from the first communication hole 311, which is beneficial to reducing the flow path of the cooling liquid and ensuring good cooling effect on the cells 21; or, at least one second communication hole 321 is opposite to any two adjacent cells 21, so that the cooling liquid flowing out of the third channels 212 of the two adjacent cells 21 can flow out of the mounting cavity 11 through the second communication hole 321 in a converging manner, and the smooth flow of the cooling liquid is ensured; or, the two adjacent cells 21 are opposite to the at least one first communication hole 311, and the two adjacent cells 21 are opposite to the at least one second communication hole 321, so that the cooling liquid flows into the third channels 212 of the two adjacent cells 21 after being split from the first communication hole 311, and the cooling liquid flowing out of the third channels 212 of the two adjacent cells 21 can flow out of the mounting cavity 11 through the second communication hole 321 in a converging manner, which is beneficial to reducing the flow path of the cooling liquid, ensuring smooth flow of the cooling liquid and good cooling effect on the cells 21.

In some embodiments, the third channels 212 of the two electric cells 21 located at two ends and far away from each other are opposite to the at least one first communication hole 311, so that the cooling liquid flowing out of the first communication hole 311 can directly flow into the third channels 212, which is beneficial to reducing the flow path of the cooling liquid and ensuring good cooling effect on the electric cells 21; alternatively, the third channels 212 of the two cells 21 located at both ends, which are far from each other, are opposite to the at least one second communication hole 321, so that the cooling liquid flowing out of the third channels 212 can flow out of the mounting cavity 11 directly through the second communication holes 321, ensuring smooth flow of the cooling liquid; still alternatively, the third channels 212 of the two electric cores 21 at the two ends, which are far away from each other, are opposite to the at least one first communication hole 311, and the third channels 212 of the two electric cores 21 at the two ends, which are far away from each other, are opposite to the at least one second communication hole 321, so that the cooling liquid flowing out of the first communication hole 311 can directly flow into the third channels 212, and the cooling liquid flowing out of the third channels 212 can directly flow out of the mounting cavity 11 through the second communication holes 321, which is beneficial to reducing the flow path of the cooling liquid, ensuring the smooth flow of the cooling liquid, and ensuring the good cooling effect on the electric cores 21.

According to some embodiments of the present utility model, as shown in fig. 2-4, the third channels 212 may be multiple, and the multiple third channels 212 are arranged at intervals along a third direction (for example, an up-down direction shown in fig. 1), where the first direction, the second direction and the third direction are perpendicular to each other, so that the structural strength of the housing 211 can be increased, the contact area between the cooling liquid and the housing 211 can be increased, and the cooling efficiency of the battery cell 21 can be improved.

In the embodiment of the present utility model, the number of the third channels 212 may be flexibly set according to practical situations, for example, the number of the third channels 212 may be four as shown in fig. 4, or may be two, three, five, six or more, which is within the scope of the present utility model.

In some embodiments of the present utility model, as shown in fig. 2-4, the battery cell 21 includes a pole piece 215, the pole piece 215 is located inside the housing 211, and the pole piece 215 can be protected by the housing 211, so that damage caused by exposure of the pole piece 215 is avoided, and normal use of the battery cell 21 is ensured.

In addition, as shown in fig. 2-4, the housing 211 includes two battery cell end caps 213 and a battery cell housing body 214, the battery cell housing body 214 surrounds the outer peripheral side of the pole piece 215, the two battery cell end caps 213 are respectively covered at two ends of the battery cell housing body 214 along the first direction, and the two battery cell end caps 213 are respectively connected with the battery cell housing body 214, so that the sealing reliability of the housing 211 to the pole piece 215 is ensured, the use safety of the battery cell 21 is ensured, the structure of the housing 211 is simple, and the processing and the manufacturing are convenient. Meanwhile, the third channel 212 is disposed on the battery cell casing body 214, so that the third channel 212 is convenient to process and manufacture, which is beneficial to reducing the weight of the battery cell casing body 214 and reducing the manufacturing cost.

In some embodiments, as shown in fig. 2-4, the largest two surfaces of the battery cell casing body 214 are both provided with the third channel 212, and the cooling effect on the battery cells 21 is ensured by the cooling liquid entering the third channel 212, and the flow of the cooling liquid between two adjacent battery cells 21 is facilitated, which is beneficial to improving the cooling efficiency on the battery cells 21.

According to some embodiments of the present utility model, the battery cell casing body 214 is an integral piece, so that the processing technology of the battery cell casing body 214 is simple, the processing and manufacturing of the battery cell casing body 214 are convenient, the high connection strength is ensured, the assembly process is reduced, and the production efficiency is high. For example, the cell housing body 214 is formed by an extrusion process.

In some embodiments of the present utility model, as shown in fig. 1, 5 and 6, the housing 10 includes a first cover 12, a second cover 13 and a housing body 14, the first cover 12 and the second cover 13 are respectively located at two sides of the housing body 14 along a third direction, and the first cover 12 and the second cover 13 are respectively connected with the housing body 14 to define a mounting cavity 11, so that the housing 10 has a simple structure and is convenient for processing and manufacturing.

In addition, as shown in fig. 1, 5 and 6, the case body 14 includes two side beams 141 and two end caps 142, the two side beams 141 are spaced apart in the first direction, the two end caps 142 are spaced apart in the second direction, and both ends of the two side beams 141 in the second direction are respectively connected with the end caps 142 of the same side to form the case body 14, ensuring high structural strength and simple structure of the case body 14. Meanwhile, the first channel 31 and the second channel 32 are respectively arranged on the two side beams 141, so that the first channel 31 and the second channel 32 are convenient to process and manufacture, and the cooling liquid can smoothly flow in the side beams 141. For example, the edge beam 141 and the end cover 142 are connected by welding, so that the connection is ensured to be reliable, the installation cavity 11 is sealed reliably, and the processing cost is reduced.

In some embodiments, the edge beam 141 is formed by connecting two ends of an aluminum profile piece with the sealing end cover 142, and has the advantages of simple structure, light weight, better corrosion resistance and capability of meeting the use requirement. For example, the aluminum profile is welded to the seal cap 142.

In some embodiments, as shown in fig. 1 and 5, the liquid inlet 33 and the liquid outlet 34 are respectively disposed on the two side beams 141, and the liquid inlet 33 and the liquid outlet 34 are respectively disposed on opposite sides of the two side beams 141 along the second direction, so that the processing and manufacturing of the side beams 141 are facilitated, the universality of the side beams 141 can be realized, and the processing and manufacturing of the liquid inlet 33 and the liquid outlet 34 are facilitated, which is beneficial to reducing the manufacturing cost.

In some embodiments, a gap is formed between the first cover 12 and the battery module 20, so that a cooling liquid can enter between the first cover 12 and the battery module 20, and the cooling liquid can cool one end (for example, the upper end shown in fig. 1) of the battery module 20 facing the first cover 12, so that the cooling effect on the battery cells 21 is ensured to be good, the required cooling requirement is met, and other internal structures are convenient to place between the first cover 12 and the battery module 20, and the required placing requirement is met.

According to some embodiments of the present utility model, as shown in fig. 1, the battery pack 100 further includes a bottom plate 40, the bottom plate 40 is located at one side of the battery module 20 along the third direction, and the bottom plate 40 is disposed between the battery module 20 and the housing 10, the bottom plate 40 can support the battery module 20, and the bottom plate 40 can protect the battery module 20, so as to ensure a good protection effect of the battery module 20.

In addition, as shown in fig. 7, the bottom plate 40 has a fourth channel 41 therein, and the fourth channel 41 communicates with the mounting cavity 11 such that the cooling liquid may enter the fourth channel 41, and the fourth channel 41 may provide a flow path for the flow of the cooling liquid, thereby cooling the battery module 20 through the fourth channel 41 and ensuring smooth flow of the cooling liquid.

Therefore, the battery module 20 can be supported and protected through the bottom plate 40, the flow guide of the cooling liquid can be realized, the cooling effect of the battery module 20 is guaranteed to be good, the effect is realized by other structures, the production cost is reduced, and the space utilization rate is improved.

In some embodiments in which the case 10 includes the first cover 12, the second cover 13, and the case body 14, as shown in fig. 1, the bottom plate 40 is disposed between the second cover 13 and the battery module 20, so that a good protection effect on the battery module 20 can be ensured, and the cooling liquid can cool one end (e.g., the lower end shown in fig. 1) of the battery module 20 toward the second cover 13, so that a good cooling effect on the battery cells 21 is ensured, and the required cooling requirement is satisfied.

In some embodiments of the present utility model, as shown in fig. 1 and 2, a heat insulation member 50 is disposed between two adjacent battery cells 21, and heat of the two adjacent battery cells 21 can be prevented from being mutually conducted by the heat insulation member 50 through the housing 211, so that heat of the battery cells 21 is only transferred to the cooling liquid, and the circulating cooling liquid takes away the heat, thereby ensuring good cooling effect of the battery cells 21, avoiding damage to the adjacent battery cells 21, and being beneficial to prolonging the service life of the battery pack 100.

Other constructions and operations of the battery pack 100 according to the embodiment of the present utility model are known to those of ordinary skill in the art, and will not be described in detail herein.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description herein, reference to the terms "embodiment," "specific embodiment," "example," and the like, 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 shell is provided with an installation cavity, a first channel and a second channel are respectively arranged in two opposite side walls of the shell along a first direction, the first channel and the second channel are communicated with the installation cavity, one of the first channel and the second channel is provided with a liquid inlet, and the other one of the first channel and the second channel is provided with a liquid outlet;

the battery module is arranged in the mounting cavity and comprises a plurality of battery cells which are arranged along a second direction, the second direction is perpendicular to the first direction, and a third channel which extends along the first direction is formed in a shell of the battery cells.

2. The battery pack according to claim 1, wherein the third passage is provided in a plane of the housing perpendicular to the second direction, and the plane of the housing perpendicular to the second direction is a surface of the housing having the largest area.

3. The battery pack according to claim 2, wherein a first communication hole and a second communication hole are respectively provided in the case at sides of the opposite side walls in the first direction, which are close to the battery cell, the first communication hole being for communicating the mounting cavity and the first passage, and the second communication hole being for communicating the mounting cavity and the second passage.

4. The battery pack according to claim 3, wherein the first communication holes are provided in plural at intervals along the second direction, the second communication holes are provided in plural at intervals along the second direction,

any two adjacent electric cores are opposite to at least one first communication hole; and/or, any two adjacent cells are opposite to at least one second communication hole.

5. The battery pack of claim 1, wherein the third channel is a plurality of channels spaced apart along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other.

6. The battery pack of claim 1, wherein the battery cell comprises a pole piece, the pole piece being located inside the housing, the housing comprising:

two cell end caps;

the battery cell shell body, the battery cell shell body encircles the periphery side of pole piece, two the battery cell end cover is located respectively the battery cell shell body is followed the both ends of first direction and connection, the third passageway is located on the battery cell shell body.

7. The battery pack of claim 6, wherein the cell casing body is a single piece.

8. The battery pack of claim 1, wherein the housing comprises:

a first cover and a second cover;

the shell body, first lid with the second lid is located respectively the shell body is along the both sides of third direction and connect in order to inject the installation cavity, the shell body includes two edges that follow the first direction is spaced apart and two edges that the second direction is spaced apart the end cover, two edges along the both ends of second direction respectively with same side the end cover is connected, first passageway with the second passageway is located respectively on the two edges.

9. The battery pack of claim 1, further comprising:

the bottom plate, the bottom plate is located the one side along the third direction of battery module just locates battery module with between the casing, have the fourth passageway in the bottom plate, the fourth passageway with the installation cavity intercommunication.

10. The battery pack of claim 1, wherein a thermal insulator is disposed between adjacent ones of the cells.