CN220627943U

CN220627943U - Battery pack

Info

Publication number: CN220627943U
Application number: CN202322202905.4U
Authority: CN
Inventors: 张静; 刘建龙; 宗福才; 陈玉琪
Original assignee: Xinwangda Power Technology Co ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-19
Anticipated expiration: 2033-08-15

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack which comprises a box body, a plurality of battery monomers and a liquid cooling plate; the liquid cooling plate is arranged in the box body and comprises a first plate body, a second plate body and a third plate body; the number of the second plate bodies is multiple, the second plate bodies are arranged at intervals along the first direction and connected to one side of the first plate body, and a first placing space is formed between two adjacent second plate bodies; the number of the third plates is multiple, the third plates are arranged at intervals along the first direction and connected to one side, deviating from the second plate, of the first plate, a second placing space is formed between two adjacent third plates, and at least one battery monomer is arranged in each of the first placing space and the second placing space.

Description

Battery pack

Technical Field

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

Background

In recent years, with the continuous development of new energy automobiles, power batteries are widely used as power sources of the new energy batteries in the new energy automobiles. The chemical reaction of the battery monomer in the charge and discharge process can generate heat, so that the internal temperature of the battery monomer is increased, particularly under the conditions of high current and high power charge and discharge, the temperature rise phenomenon is more serious, and the performance of the battery monomer is greatly attenuated and even safety accidents can be caused along with the increase of the temperature of the battery monomer; therefore, a thermal management system is arranged in the battery pack to reduce the temperature of the battery pack, and the current thermal management system mainly comprises natural cooling, air cooling, liquid cooling and the like, wherein the liquid cooling system has the best cooling performance and is wide in application; the liquid cooling system of the battery pack in the prior art has low cooling efficiency and poor cooling effect on the battery monomers.

Disclosure of Invention

The utility model aims to provide a battery pack which can improve the cooling efficiency of a liquid cooling system on a battery monomer and improve the cooling effect of the liquid cooling system on the battery monomer.

In order to achieve the above object, the present utility model provides a battery pack, including a case, a plurality of battery cells, and a liquid cooling plate; the liquid cooling plate is arranged in the box body and comprises a first plate body extending along a first direction, a second plate body extending along a second direction and a third plate body extending along a third direction, wherein the first direction, the second direction and the third direction are on the same plane and are intersected in pairs; the number of the second plate bodies is multiple, the second plate bodies are connected to one side of the first plate body at intervals along the first direction, and a first placing space is formed between two adjacent second plate bodies; the number of the third plate bodies is multiple, the third plate bodies are arranged along the first direction at intervals and connected to one side, deviating from the second plate body, of the first plate body, a second placing space is formed between every two adjacent third plate bodies, and at least one battery monomer is arranged in each of the first placing space and the second placing space.

In some embodiments, a liquid cooling cavity for accommodating cooling liquid is formed in at least one of the first plate body, the second plate body and the third plate body, and the box body comprises a frame, and the frame is provided with a liquid cooling runner communicated with the liquid cooling cavity.

In some embodiments, the liquid-cooled cavity comprises a first cavity, a second cavity, and a third cavity; the first cavity is formed in the first plate body, the second cavity communicated with the first cavity is formed in the second plate body, and the third cavity communicated with the first cavity is formed in the third plate body; the liquid cooling flow channel comprises a first liquid cooling flow channel and a second liquid cooling flow channel; the first liquid cooling runner is communicated with the first cavity, the second liquid cooling runner is communicated with one end, away from the first cavity, of the second cavity, and/or the second liquid cooling runner is communicated with one end, away from the first cavity, of the third cavity.

In some embodiments, the first direction intersects the second direction and forms an included angle a, satisfying: a is more than or equal to 30 degrees and less than 90 degrees, and/or the first direction intersects with the third direction and forms an included angle b, so that the following conditions are satisfied: b is more than or equal to 30 degrees and less than 90 degrees.

In some embodiments, the first direction intersects the second direction at an angle a and the first direction intersects the third direction at an angle b, satisfying: a=b, and a+b is more than or equal to 60 degrees and less than 180 degrees.

In some embodiments, the connection position of the second plate body and the first plate body and the connection position of the third plate body and the first plate body are staggered in the first direction.

In some embodiments, further comprising a first connecting piece and a second connecting piece; the first connecting piece spans at least one second plate body along the first direction and is used for connecting battery cells positioned in two first placing spaces;

the second connecting piece stretches across at least one third plate body along the first direction and is used for connecting the battery cells in the two second placing spaces.

In some embodiments, a side of the first connecting piece facing the second plate body and a side of the second plate body facing the first connecting piece have a first distance H in a height direction ₁ The method comprises the following steps: h is more than or equal to 2mm ₁ Less than or equal to 4mm; and/or the surface of the second connecting sheet facing the third plate body and the surface of the third plate body facing the second connecting sheet have a second distance H in the height direction ₂ The method comprises the following steps: h is more than or equal to 2mm ₂ ≤4mm。

In some embodiments, further comprising a third connecting piece and a fourth connecting piece; two or more than two battery cells are placed in one first placing space, and two ends of the third connecting sheet along the first direction are respectively connected with adjacent battery cells in the same first placing space; two or more than two battery cells are placed in the second placing space, and two ends of the fourth connecting sheet along the first direction are respectively connected with adjacent battery cells in the same second placing space.

In some embodiments, a control module is further included; and a containing space is defined between the second plate body, the third plate body and the inner wall of the box body, and the control module is arranged in the containing space.

Compared with the prior art, the battery pack has the beneficial effects that: through set up a plurality of second plate bodies and a plurality of third plate body respectively in the both sides of first plate body to be formed with between two adjacent second plate bodies and be used for putting the first space of putting of battery monomer and be formed with between two adjacent third plate bodies and be used for putting the first space of putting of battery monomer, make first plate body can cool off respectively and locate the first battery monomer of putting space and second space of putting simultaneously, can make two second plate bodies cool off respectively and locate two relative surfaces of battery monomer in the first space of putting again, and utilize two third plate bodies to cool off respectively and locate two relative surfaces of battery monomer in the second space of putting, with the heat transfer area between expansion liquid cooling plate and the battery monomer, promote liquid cooling plate to the free cooling efficiency of battery.

Drawings

Fig. 1 is a block diagram of a battery pack according to an embodiment of the present utility model;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present utility model

Fig. 3 is a top view of a battery pack according to an embodiment of the present utility model, with a cover omitted;

fig. 4 is a first cross-sectional view of a battery pack according to an embodiment of the present utility model;

fig. 5 is a second cross-sectional view of a battery pack according to an embodiment of the present utility model;

fig. 6 is a perspective view of a case and a liquid cooling plate in connection according to an embodiment of the present utility model.

FIG. 7 is a top view of a case and a liquid cooling plate according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a liquid cooling plate according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a liquid cooling plate according to an embodiment of the present utility model;

FIG. 10 is a block diagram of a case according to an embodiment of the present utility model;

FIG. 11 is a top view of a case provided in an embodiment of the present utility model;

FIG. 12 is a cross-sectional view of a case provided by an embodiment of the present utility model;

fig. 13 is a cross-sectional view of a case and a liquid cooling plate according to an embodiment of the present utility model.

In the figure, 1, a box body; 11. a frame; 12. a bottom plate; 111. a first side plate; 112. a second side plate; 113. a first end plate; 114. a second end plate; 1111. a fourth cavity; 1121. a fifth cavity;

2. a liquid cooling plate; 21. a first plate body; 22. a second plate body; 23. a third plate body;

3. a control module;

4. a battery cell;

5. a first connecting piece;

6. a second connecting piece;

7. a third connecting piece;

8. a fourth connecting piece;

9. a cover plate;

10. an accommodating space; 101. a first wall surface; 102. a second wall surface;

20. a liquid cooling cavity; 201. a first cavity; 202. a second cavity; 203. a third cavity;

30. a first liquid cooling flow passage; 40. a second liquid cooling flow path; 301. a liquid inlet; 401. a liquid outlet;

220. a first placement space; 230. a second placement space;

x, a first direction; B. a second direction; D. a third direction; y, fourth direction; z, the fifth direction.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of 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", etc. indicate orientations or positional relationships based on 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 in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes 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. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the embodiments of the present utility model, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The term "parallel" in the present application includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering, for example, "parallel" refers to a state in which straight lines form an angle of-1 ° to 1 ° with respect to straight lines, straight lines form an angle of plane with respect to plane, or plane with respect to plane; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering, for example, vertical "refers to a state in which an angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The distances are equal or the angles are equal, not only the absolute equal condition is included, but also the general equal condition of the conventional cognition in engineering is included, and certain errors can exist, such as a state that the tolerance range is between-1% and 1%.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.

Referring to fig. 1-3, a battery pack according to an embodiment of the present utility model includes a case 1, a liquid cooling plate 2, a plurality of battery cells 4, a control module 3, a first connecting piece 5, a second connecting piece 6, a third connecting piece 7, a fourth connecting piece 8, and a cover plate 9. The liquid cooling plate 2, the battery monomer 4, the control module 3, the first connecting piece 5, the second connecting piece 6, the third connecting piece 7 and the fourth connecting piece 8 are all arranged in the box body 1, and the cover plate 9 is covered on the box body 1.

The liquid cooling plate 2 is provided with a liquid cooling chamber 20.

The tank 1 is provided with a liquid cooling flow passage including a first liquid cooling flow passage 30 and a second liquid cooling flow passage 40.

In this embodiment, the battery pack has the first direction X, the fourth direction Y, and the fifth direction Z perpendicular to each other and not simultaneously in the same plane.

In this embodiment, the control module 3 is a BDU control module 3.

Referring to fig. 2-5, and fig. 6-7 and fig. 10-12, the case 1 includes a frame 11 and a bottom plate 12, and the frame 11 is connected to the bottom plate 12.

In this embodiment, the frame 11 includes a first side plate 111, a first end plate 113, a second side plate 112, and a second end plate 114 connected in order from end to end.

One surface of the first side plate 111 facing the first plate 21 is a first wall surface 101, one end of the second plate 22, which is far away from the first plate 21, is connected to the first wall surface 101, one surface of the second side plate 112 facing the second plate 22 is a second wall surface 102, and one end of the third plate 23, which is far away from the first plate 21, is connected to the second wall surface 102.

The first wall surface 101, the second plate body 22, the third plate body 23, the second wall surface 102 and the second end plate 114 are sequentially connected to enclose a receiving space 10 for receiving the control module 3, and the shape of the receiving space 10 is designed according to the shape of the control module 3.

The frame 11 is provided with a liquid cooling flow passage communicated with the liquid cooling cavity 20. The first end plate 113 is provided with a first liquid cooling flow passage 30, and the first side plate 111 and the second side plate 112 are each provided with a second liquid cooling flow passage 40.

Referring to fig. 2 to 3, 6 to 9 and 13, the battery pack further has a second direction B and a third direction D, and the first direction X, the second direction B and the third direction D are on the same plane and intersect each other two by two; the liquid cooling plate 2 is arranged in the box body 1, and the liquid cooling plate 2 comprises a first plate body 21 extending along a first direction X, a second plate body 22 extending along a second direction B and a third plate body 23 extending along a third direction D, wherein the first direction X, the second direction B and the third direction D are on the same plane and are intersected in pairs; the number of the second plate bodies 22 is a plurality, and the plurality of second plate bodies 22 are arranged at intervals along the first direction X and connected to one side of the first plate body 21, and a first placing space 220 is formed between two adjacent second plate bodies 22; the number of the third plate bodies 23 is multiple, the third plate bodies 23 are arranged at intervals along the first direction X and are connected to one side, deviating from the second plate body 22, of the first plate body 21, a second placing space 230 is formed between two adjacent third plate bodies 23, at least one battery monomer 4 is arranged in each of the first placing space 220 and the second placing space 230, a containing space 10 is formed between the second plate body 22, the third plate bodies 23 and the inner wall of the box body 1 in a surrounding mode, and the control module 3 is arranged in the containing space 10. By arranging the plurality of second plate bodies 22 and the plurality of third plate bodies 23 on two sides of the first plate body 21 respectively, and forming a first placing space 220 for placing the battery cells 4 between two adjacent second plate bodies 22 and a second placing space 230 for placing the battery cells 4 between two adjacent third plate bodies 23, the battery cells 4 respectively arranged in the first placing space 220 and the second placing space 230 can be cooled by the first plate body 21 at the same time, two opposite surfaces of the battery cells 4 respectively arranged in the first placing space 220 can be cooled by the two second plate bodies 22, and two opposite surfaces of the battery cells 4 respectively arranged in the second placing space 230 can be cooled by the two third plate bodies 23, so that the heat exchange area between the liquid cooling plate 2 and the battery cells 4 is enlarged, and the purposes of improving the cooling efficiency of the liquid cooling plate 2 for the battery cells 4 and the cooling effect of the liquid cooling plate 2 for the battery cells 4 are achieved.

In the present embodiment, two battery cells 4 arranged in the first direction X are placed in one first placement space 220.

In other embodiments, one first placement space 220 may place one, three, four, etc. of any number of battery cells 4. The plurality of battery cells 4 may be arranged in the first direction X and/or in the second direction B.

In the present embodiment, two battery cells 4 arranged along the first direction X are placed in one second placement space 230.

In other embodiments, one second placement space 230 may place any number of battery cells 4, such as one, three, four, etc. The plurality of battery cells 4 may be arranged in the first direction X and/or in the second direction B.

In the present embodiment, the liquid cooling chamber 20 includes a first chamber 201, a second chamber 202, and a third chamber 203; the first plate 21 has a first cavity 201 formed therein, the second plate 22 has a second cavity 202 formed therein and communicating with the first cavity 201, and the third plate 23 has a third cavity 203 formed therein and communicating with the first cavity 201; the first liquid cooling flow channel 30 is communicated with the first cavity 201, the second liquid cooling flow channel 40 is communicated with one end of the second cavity 202 away from the first cavity 201, and the second liquid cooling flow channel 40 is communicated with one end of the third cavity 203 away from the first cavity 201.

The first cavity 201 is provided with a liquid inlet 301, the first cavity 201 is communicated with the first liquid cooling flow channel 30 through the liquid inlet 301, one end, away from the first cavity 201, of the second cavity 202 and one end, away from the first cavity 201, of the third cavity 203 are provided with liquid outlets 401, and the second cavity 202 and the third cavity 203 are communicated with the second liquid cooling flow channel 40 through the liquid outlets 401.

The first direction X intersects with the second direction B and forms an included angle a, which satisfies the following conditions: a is more than or equal to 30 degrees and less than 90 degrees, and/or the first direction X is intersected with the third direction D to form an included angle b, so that the following conditions are satisfied: b is more than or equal to 30 degrees and less than 90 degrees. The first placing space 220 can be inclined by 30 degrees or more and less than 90 degrees, the control module 3 and more battery cells 4 are arranged in the inner space of the box body 1 by fully utilizing the first placing space, and the second placing space 230 can be inclined by 30 degrees or less and less than 90 degrees and the control module 3 and more battery cells 4 are arranged in the inner space of the box body 1 by fully utilizing the second placing space 230.

It will be appreciated that any tool or device such as a protractor or angle meter may be used to measure angles a and b, and is not limited in this regard.

The first direction X intersects with the second direction B and forms an included angle a, and the first direction X intersects with the third direction D and forms an included angle B, so that the following conditions are satisfied: a=b, and a+b is more than or equal to 60 degrees and less than 180 degrees. The first placing space 220 and the second placing space 230 can be symmetrically arranged in the inner space of the case 1 in such a way that a=b and 60 ° -a+b < 180 ° are adopted, so that more battery cells 4 can be placed by more effectively using the inner space of the case 1.

In this embodiment, a=b, a=45°, and b=45°. The control module 3 and the plurality of battery cells 4 can be provided by making full use of the internal space of the case 1.

In other embodiments, a > b or a < b is also possible, a may be any value satisfying 30 ° -a < 90 ° such as 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, and b may be any value satisfying 30 ° -b < 90 ° such as 30 ° -a < 90 °, 40 °, 50 °, 60 °, 70 °, 80 °, and the like, without limitation.

The connection position of the second plate 22 and the first plate 21 and the connection position of the third plate 23 and the first plate 21 are staggered in the first direction X. By the design, the inflow position of the cooling liquid flowing into the second cavity 202 from the first cavity 201 and the inflow position of the cooling liquid flowing into the third cavity 203 from the first cavity 201 are staggered in the first direction X, so that the cooling liquid in the first cavity 201 can better flow into the second cavity 202 and the third cavity 203 respectively, and the cooling effect of the second plate 22 and the third plate 23 on the battery cells 4 is improved.

Referring to fig. 2 to 5, the first connecting piece 5 spans at least one second plate 22 along the first direction X and is used for connecting the battery cells 4 located in two first placement spaces 220; the second connecting piece 6 spans at least one third plate 23 along the first direction X and is used for connecting the battery cells 4 in the two second placing spaces 230.

In the present embodiment, the first connecting piece 5 spans one second plate 22 along the first direction X and is used for connecting two adjacent battery cells 4 located in two adjacent first placement spaces 220.

In the present embodiment, the second connecting piece 6 spans one third plate 23 along the first direction X and is used for connecting two adjacent battery cells 4 located in two adjacent second placement spaces 230.

The side of the first connecting piece 5 facing the second plate body 22 and the side of the second plate body 22 facing the first connecting piece 5 have a first distance H in the height direction ₁ The method comprises the following steps: h is more than or equal to 2mm ₁ Less than or equal to 4mm; and/or the surface of the second connecting piece 6 facing the third plate body 23 and the surface of the third plate body 23 facing the second connecting piece 6 have a second distance H in the height direction ₂ The method comprises the following steps: h is more than or equal to 2mm ₂ And is less than or equal to 4mm. H is less than or equal to 2mm ₁ And H is more than or equal to 2mm ₂ Can meet the connection requirement of the battery cells 4 in the adjacent two first placing spaces 220, and adopts H ₁ Less than or equal to 4mm and H ₂ The accommodating space formed between the box body 1 and the cover plate 9 can be fully utilized by less than or equal to 4mm.

In some embodiments, H ₁ Can be 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm and the like, and can meet H which is less than or equal to 2mm ₁ A value of less than or equal to 4mm, H ₂ Can be 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm and the like, and can meet H which is less than or equal to 2mm ₂ The value of 4mm or less is not limited herein.

Two or more than two battery cells 4 are placed in one first placing space 220, and two ends of the third connecting sheet 7 along the first direction X are respectively connected with adjacent battery cells 4 in the same first placing space 220; two or more than two battery cells 4 are arranged in one second arrangement space 230, and two ends of the fourth connecting sheet 8 along the first direction X are respectively connected with adjacent battery cells 4 in the same second arrangement space 230.

In this embodiment, two ends of the third connecting piece 7 along the first direction X are respectively connected to two adjacent battery cells 4 located in the same first placement space 220.

In this embodiment, two ends of the fourth connecting piece 8 along the first direction X are respectively connected to two adjacent battery cells 4 located in the same second placement space 230.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims

1. A battery pack, comprising:

a case (1);

a plurality of battery cells (4);

a liquid cooling plate (2) arranged in the box body (1), wherein the liquid cooling plate (2) comprises a first plate body (21) extending along a first direction (X), a second plate body (22) extending along a second direction (B) and a third plate body (23) extending along a third direction (D), and the first direction (X), the second direction (B) and the third direction (D) are on the same plane and are intersected with each other;

the number of the second plate bodies (22) is multiple, the second plate bodies (22) are connected to one side of the first plate body (21) at intervals along the first direction (X), and a first placing space (220) is formed between two adjacent second plate bodies (22); the number of the third plate bodies (23) is multiple, the third plate bodies (23) are arranged along the first direction (X) at intervals and connected to one side, deviating from the second plate body (22), of the first plate body (21), a second placing space (230) is formed between every two adjacent third plate bodies (23), and at least one battery monomer (4) is arranged in each of the first placing space (220) and the second placing space (230).

2. The battery pack according to claim 1, wherein a liquid cooling cavity (20) for accommodating cooling liquid is formed in at least one of the first plate body (21), the second plate body (22) and the third plate body (23), the case body (1) comprises a frame (11), and a liquid cooling flow channel communicated with the liquid cooling cavity (20) is arranged in the frame (11).

3. The battery pack according to claim 2, wherein the liquid cooling chamber (20) includes a first chamber (201), a second chamber (202), and a third chamber (203);

the first cavity (201) is formed inside the first plate body (21), the second cavity (202) communicated with the first cavity (201) is formed inside the second plate body (22), and the third cavity (203) communicated with the first cavity (201) is formed inside the third plate body (23);

the liquid cooling flow channel comprises a first liquid cooling flow channel (30) and a second liquid cooling flow channel (40);

the first liquid cooling runner (30) is communicated with the first cavity (201), the second liquid cooling runner (40) is communicated with one end, away from the first cavity (201), of the second cavity (202), and/or the second liquid cooling runner (40) is communicated with one end, away from the first cavity (201), of the third cavity (203).

4. The battery pack according to claim 1, wherein the first direction (X) intersects the second direction (B) at an angle a that satisfies: 30 DEG or more a < 90 DEG and/or the first direction (X) intersects the third direction (D) and forms an angle b, satisfying the following: b is more than or equal to 30 degrees and less than 90 degrees.

5. The battery pack according to claim 1, wherein the first direction (X) intersects the second direction (B) at an angle a and the first direction (X) intersects the third direction (D) at an angle B, satisfying: a=b, and a+b is more than or equal to 60 degrees and less than 180 degrees.

6. The battery pack according to claim 1, wherein the connection position of the second plate body (22) and the first plate body (21) and the connection position of the third plate body (23) and the first plate body (21) are arranged offset in the first direction (X).

7. The battery pack according to claim 1, further comprising a first connecting piece (5) and a second connecting piece (6);

the first connecting piece (5) spans at least one second plate body (22) along the first direction (X) and is used for connecting battery cells (4) positioned in two first placing spaces (220);

the second connecting piece (6) spans at least one third plate body (23) along the first direction (X) and is used for connecting the battery cells (4) in the two second placing spaces (230).

8. The battery pack according to claim 7, wherein a face of the first connecting piece (5) facing the second plate body (22) and a face of the second plate body (22) facing the first connecting piece (5) have a first distance H in a height direction (Z) ₁ The method comprises the following steps: h is more than or equal to 2mm ₁ Less than or equal to 4mm; and/or the number of the groups of groups,

the surface of the second connecting piece (6) facing the third plate body (23) and the surface of the third plate body (23) facing the second connecting piece (6) have a second distance H in the height direction (Z) ₂ The method comprises the following steps: h is more than or equal to 2mm ₂ ≤4mm。

9. The battery pack according to claim 1, further comprising a third connecting piece (7) and a fourth connecting piece (8);

two or more than two battery cells (4) are arranged in one first arrangement space (220), and two ends of the third connecting sheet (7) along the first direction (X) are respectively connected with adjacent battery cells in the same first arrangement space (220);

two or more than two battery cells (4) are arranged in the second arrangement space (230), and two ends of the fourth connecting sheet (8) along the first direction (X) are respectively connected with adjacent battery cells (4) in the same second arrangement space (230).

10. The battery pack according to claim 1, further comprising a control module (3);

the second plate body (22), the third plate body (23) and the inner wall of the box body (1) enclose a containing space (10), and the control module (3) is arranged in the containing space (10).