Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, and belongs to the technical field of batteries, the battery pack comprises a box body, a plurality of liquid cooling pieces arranged along a first direction and a flexible pipe, each liquid cooling piece comprises an end plate and a liquid cooling plate connected with the end plate, the end plate extends along the first direction, and the liquid cooling plate extends along a second direction; a liquid inlet and a liquid outlet are formed in the end plate at an interval, a flow channel is formed in the liquid cooling plate, and the liquid inlet and the liquid outlet are respectively communicated with the flow channel; according to the battery pack disclosed by the utility model, the liquid inlets and the liquid outlets between the two adjacent liquid cooling pieces are connected through the flexible pipes, so that the liquid cooling pieces are connected in series, and due to the adoption of the flexible pipes, the concentricity problem of the liquid inlets and the liquid outlets in the two adjacent liquid cooling pieces does not need to be considered, so that the installation time is saved, and the installation efficiency is improved. And moreover, the requirement on the processing precision of the liquid cooling part is reduced, and the cost is reduced.

Description

Technical Field

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

[0002] In the existing battery packs, the liquid cooling component combination structure with the best heat exchange effect is the large-surface liquid cooling component combination structure: multiple liquid cooling components are vertically spaced between several battery cells in the battery pack, one end of each liquid cooling component is passed through and connected by a horizontal water inlet pipe, and the other end of the liquid cooling component is passed through and connected by a horizontal water outlet pipe.

[0003] However, when using the existing large-surface liquid-cooling component combination structure, during installation, for multiple liquid-cooling components, it is necessary to ensure that the water inlet pipe has a high degree of concentricity when passing through each liquid-cooling component (that is, the center line of the water inlet pipe is in a straight line), and the water outlet pipe has a high degree of concentricity when passing through each liquid-cooling component, and the center line of the water inlet pipe and the center line of the water outlet pipe must be parallel to each other, so as to ensure the sealing effect after installation. Therefore, high assembly precision is required, the installation is more troublesome, and the processing requirements for liquid-cooling components, water inlet pipes, water outlet pipes, etc. are high, which leads to increased costs. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the large-surface liquid cooling component combination structure is troublesome to install and requires high processing precision of the liquid cooling component, thereby providing a battery pack and an electrical device having the same.

[0005] In order to solve the above technical problems, the utility model provides a battery pack having a first direction and a second direction intersecting each other, including:

[0006] A box body, with a containing cavity inside;

[0007] A plurality of liquid cooling components are arranged in the accommodating cavity, the plurality of liquid cooling components are arranged along a first direction, the liquid cooling components include: an end plate and a liquid cooling plate connected to the end plate, the end plate extends along the first direction, and the liquid cooling plate extends along the second direction; a liquid inlet and a liquid outlet are arranged at intervals on the end plate, a flow channel is arranged inside the liquid cooling plate, and the liquid inlet and the liquid outlet are respectively connected to the flow channel;

[0008] Flexible tube, for two adjacent end plates, the liquid outlet of one end plate and the liquid inlet of the other liquid cooling component are connected through the flexible tube.

[0009] Optionally, a liquid inlet cavity and a liquid outlet cavity are provided inside the end plate, and the liquid inlet cavity and the liquid outlet cavity are arranged at intervals;

[0010] The liquid inlet cavity and the liquid outlet cavity are respectively communicated with the flow channel; the liquid inlet is communicated with the liquid inlet cavity, and the liquid outlet is communicated with the liquid outlet cavity.

[0011] Optionally, the battery pack further comprises a battery cell, and the battery cell is connected to the liquid cooling plate;

[0012] The end plate includes a first side wall and a second side wall arranged opposite to each other along the second direction, the second side wall is arranged between the first side wall and the battery cell, the liquid inlet and the liquid outlet both penetrate the first side wall along the second direction, and the liquid cooling plate is connected to the second side wall.

[0013] Optionally, the battery pack further has a third direction, and the first direction, the second direction and the third direction intersect each other;

[0014] The end plate further comprises a barrier wall, and the barrier wall is respectively connected to the first side wall and the second side wall along the second direction; along the third direction, the liquid inlet and the liquid outlet are arranged on both sides of the barrier wall.

[0015] Optionally, the end plate further comprises a third side wall and a fourth side wall arranged opposite to each other along the first direction, and a first end wall and a second end wall arranged opposite to each other along the third direction; along the third direction, the barrier wall is arranged between the first end wall and the second end wall;

[0016] The third side wall and the fourth side wall are connected to the barrier wall respectively, the first end wall is connected to the first side wall, the second side wall, the third side wall and the fourth side wall respectively, and the second end wall is connected to the first side wall, the second side wall, the third side wall and the fourth side wall respectively.

[0017] Optionally, the liquid cooling plate includes a first liquid cooling plate and a second liquid cooling plate respectively extending along the second direction, the side walls of the first liquid cooling plate and the second liquid cooling plate are connected, and the second liquid cooling plate is connected to both the first liquid cooling plate and the second side wall; a first flow channel is provided inside the first liquid cooling plate, and a second flow channel is provided inside the second liquid cooling plate, the first flow channel is connected to the liquid inlet cavity, and the second flow channel is connected to the liquid outlet cavity.

[0018] Optionally, the liquid cooling plate includes a third liquid cooling plate extending along the second direction, the third liquid cooling plate is connected to the second side wall, and a third flow channel and a fourth flow channel are provided in the third liquid cooling plate. The third flow channel is connected to the liquid inlet cavity, and the fourth flow channel is connected to the liquid outlet cavity.

[0019] Optionally, the first liquid cooling plate and the second liquid cooling plate are perpendicular to each other, and the first liquid cooling plate and the second liquid cooling plate are respectively perpendicular to the second side wall.

[0020] Optionally, the battery pack further comprises a plurality of quick-connect plugs, wherein one of the quick-connect plugs is inserted into the liquid inlet and connected to the end plate, and another of the quick-connect plugs is inserted into the liquid outlet and connected to the end plate.

[0021] The utility model provides an electric device, comprising a battery pack according to any one of the above solutions.

[0022] The technical solution of the utility model has the following advantages:

[0023] 1. In the battery pack provided by the utility model, the liquid inlet and the liquid outlet of the liquid cooling component are both arranged on the end plate of the liquid cooling component, and then the liquid inlet and the liquid outlet between two adjacent liquid cooling components are connected by a flexible tube, so that a plurality of liquid cooling components are connected in series. Due to the use of the flexible tube, there is no need to consider the concentricity of the liquid inlet and the liquid outlet on two adjacent liquid cooling components, thereby saving installation time, reducing the requirements for the processing accuracy of the liquid cooling component, and reducing costs.

[0024] 2. The power-consuming device provided by the utility model can be a new energy vehicle. Since it adopts the above-mentioned battery pack, it has all the advantages of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of a three-dimensional structure in which multiple liquid cooling components are combined with battery cells;

[0028] Figure 3 for Figure 2 A schematic diagram of a three-dimensional structure of multiple liquid cooling components;

[0029] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of a single liquid cooling component;

[0030] Figure 5 for Figure 4 An enlarged view of the main cross-sectional view of the liquid cooling part in the end plate area;

[0031] Figure 6 for Figure 5Sectional view along line AA;

[0032] Figure 7 for Figure 4 A front cross-sectional view of a first liquid cooling plate of a middle liquid cooling member;

[0033] Figure 8 for Figure 4 A top cross-sectional view of a second liquid cooling plate of the middle liquid cooling member;

[0034] Fig. 9 for Figure 3 Schematic diagram of the three-dimensional structure of a single liquid cooling component;

[0035] Fig.10 for Fig. 9 Front cross-sectional view of the liquid cooling unit.

[0036] Description of reference numerals:

[0037] 1. Liquid cooling parts; 2. Flexible pipe; 3. Liquid inlet manifold; 4. Liquid outlet manifold; 5. Liquid inlet; 6. Liquid outlet; 7. End plate; 8. First liquid cooling plate; 9. Second liquid cooling plate; 10. Box; 11. Third liquid cooling plate; 12. Liquid inlet channel; 13. Liquid outlet channel; 14. Reinforcement ribs; 15. Battery cell; 16. Liquid cooling plate; 17. Flow channel;

[0038] 71, liquid inlet cavity; 72, liquid outlet cavity; 73, first side wall; 74, second side wall; 75, third side wall; 76, fourth side wall; 77, first end wall; 78, second end wall; 79, barrier wall;

[0039] 81, first flow channel; 91, second flow channel; 101, accommodating chamber; 111, third flow channel; 112, fourth flow channel; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] like Figure 1 As shown, a specific implementation of the battery pack provided in this embodiment includes: a box body 10, wherein a receiving cavity 101 is provided inside the box body 10, and a plurality of liquid cooling components 1 are provided in the receiving cavity 101.

[0046] like Figure 2 As shown, in this embodiment, the battery pack has a first direction X and a second direction Y intersecting each other, and a plurality of the liquid cooling components 1 are arranged along the first direction X.

[0047] like Figure 3 As shown, in this embodiment, the liquid cooling component 1 includes: an end plate 7 and a liquid cooling plate 16 connected to the end plate 7, the end plate 7 extends along the first direction X, and the liquid cooling plate 16 extends along the second direction Y; a liquid inlet 5 and a liquid outlet 6 are provided on the end plate 7 at intervals, a flow channel 17 is provided inside the liquid cooling plate 16, and the liquid inlet 5 and the liquid outlet 6 are respectively connected to the flow channel 17.

[0048] like Figure 3 As shown, in this embodiment, the flexible tube 2 is for two adjacent end plates 7, and the liquid outlet 6 of one end plate 7 and the liquid inlet 5 of the other liquid cooling element 1 are connected through the flexible tube 2. That is, the plurality of liquid cooling elements 1 are connected in sequence through the flexible tube 2, thereby forming a series structure.

[0049] like Figure 2 , Figure 3 As shown, in this embodiment, multiple liquid cooling components 1 are connected in series through flexible tubes 2. When in use, the liquid inlet 5 of the first liquid cooling component 1 is connected to the liquid inlet main pipe 3, and the liquid outlet 6 of the last liquid cooling component 1 is connected to the liquid outlet main pipe 4.

[0050] In the battery pack provided in the present embodiment, the liquid inlet 5 and the liquid outlet 6 of the liquid cooling component 1 are both arranged on the end plate 7 of the liquid cooling component 1, and then the liquid inlet 5 and the liquid outlet 6 between two adjacent liquid cooling components 1 are connected by a flexible tube 2, so that a plurality of liquid cooling components 1 are connected in series. Since the flexible tube 2 is used, there is no need to consider the concentricity of the liquid inlet 5 and the liquid outlet 6 on two adjacent liquid cooling components 1, thereby saving installation time, reducing the requirements for the processing accuracy of the liquid cooling component 1, and reducing costs.

[0051] like Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, a liquid inlet cavity 71 and a liquid outlet cavity 72 are provided inside the end plate 7, and the liquid inlet cavity 71 and the liquid outlet cavity 72 are arranged at intervals; the liquid inlet cavity 71 and the liquid outlet cavity 72 are respectively connected to the flow channel 17; the liquid inlet port 5 is connected to the liquid inlet cavity 71, and the liquid outlet port 6 is connected to the liquid outlet cavity 72. When in use, the coolant enters the flow channel 17 of the liquid cooling plate 16 from the liquid inlet port 5 through the liquid inlet cavity 71; the coolant in the flow channel 17 flows to the liquid outlet port 6 through the liquid outlet cavity 72, so that the coolant forms a circulation in the liquid cooling part 1. Of course, the above description is not restrictive, and in some alternative embodiments, other structures can also be adopted inside the end plate 7.

[0052] like Figure 1 , Figure 2 As shown, in this embodiment, the battery pack further includes a battery cell 15 , and the battery cell 15 is connected to the liquid cooling plate 16 , so that the battery cell 15 is cooled by the liquid cooling plate 16 .

[0053] like Figure 5As shown, in this embodiment, the end plate 7 includes a first side wall 73 and a second side wall 74 that are arranged opposite to each other along the second direction Y, the second side wall 74 is arranged between the first side wall 73 and the battery core 15, the liquid inlet 5 and the liquid outlet 6 both penetrate the first side wall 73 along the second direction Y, and the liquid cooling plate 16 is connected to the second side wall 74. Of course, the above description is not restrictive, and in some alternative embodiments, the shape of the end plate 7 may also adopt other structures.

[0054] It should be noted that, in this embodiment, the battery pack further has a third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other; further, the first direction X, the second direction Y and the third direction Z may intersect each other perpendicularly. Of course, the above description is not restrictive, and in some alternative embodiments, the first direction X, the second direction Y and the third direction Z may also have some inclination angles therebetween.

[0055] like Figure 5 As shown, in this embodiment, the end plate 7 further includes a barrier wall 79, and the barrier wall 79 is connected to the first side wall 73 and the second side wall 74 respectively along the second direction Y; along the third direction Z, the liquid inlet 5 and the liquid outlet 6 are arranged on both sides of the barrier wall 79. The barrier wall 79 is arranged to be used to separate the liquid inlet 5 and the liquid outlet 6, thereby preventing the communication between the liquid inlet 5 and the liquid outlet 6. It should be noted that, in this embodiment, the barrier wall 79 and the end plate 7 are integrally formed. In some alternative embodiments, the barrier wall 79 can also be a separate structure from the end plate 7 and connected to the end plate 7 through a mounting structure.

[0056] like Figure 6 As shown, in this embodiment, the end plate 7 further includes a third side wall 75 and a fourth side wall 76 arranged oppositely along the first direction X, and a first end wall 77 and a second end wall 78 arranged oppositely along the third direction Z; along the third direction Z, the barrier wall 79 is arranged between the first end wall 77 and the second end wall 78. Of course, the above description is not restrictive, and in some alternative embodiments, the shape of the end plate 7 may also adopt other structures.

[0057] like Figure 6 As shown, in this embodiment, the third side wall 75 and the fourth side wall 76 are respectively connected to the barrier wall 79. It should be noted that, in this embodiment, the third side wall 75, the fourth side wall 76 and the barrier wall 79 are an integrated structure. Of course, in some alternative embodiments, the third side wall 75, the fourth side wall 76 and the barrier wall 79 can also be separate structures, and then connected as a whole through a connecting structure.

[0058] like Figure 5 , Figure 6 As shown, in this embodiment, the first end wall 77 is connected to the first side wall 73, the second side wall 74, the third side wall 75, and the fourth side wall 76, respectively, and the second end wall 78 is connected to the first side wall 73, the second side wall 74, the third side wall 75, and the fourth side wall 76. Through the above arrangement, the end plate 7 is combined to form a block. Of course, the above description is not restrictive. In some alternative embodiments, the shape of the end plate 7 can also adopt other structures.

[0059] like Figure 4 As shown, in this embodiment, the first structure of the liquid cooling plate 16 includes: a first liquid cooling plate 8 and a second liquid cooling plate 9 extending along the second direction Y respectively, the side walls of the first liquid cooling plate 8 and the second liquid cooling plate 9 are connected, and the second liquid cooling plate 9 is connected to the first liquid cooling plate 8 and the second side wall 74 of the end plate 7.

[0060] like Figure 4 , Figure 7 and Figure 8 As shown, in a specific implementation of this embodiment, the flow channel 17 includes: a first flow channel 81 and a second flow channel 91, the first flow channel 81 is arranged inside the first liquid cooling plate 8, the second flow channel 91 is arranged inside the second liquid cooling plate 9, and the end of the first flow channel 81 is connected to the head end of the second flow channel 91.

[0061] like Figure 6 As shown, in this embodiment, the first flow channel 81 is connected to the liquid inlet cavity 71, and the second flow channel 91 is connected to the liquid outlet cavity 72. During operation, the coolant first enters the first flow channel 81 through the liquid inlet cavity 71, then enters the second flow channel 91 through the first flow channel 81, and finally flows out of the liquid cooling component 1 from the second flow channel 91 through the liquid outlet cavity 72.

[0062] like Figure 4 As shown, in this embodiment, the first liquid cooling plate 8 and the second liquid cooling plate 9 are perpendicular to each other, and the first liquid cooling plate 8 and the second liquid cooling plate 9 are respectively perpendicular to the second side wall 74 of the end plate 7. Such an arrangement can facilitate the arrangement of the rectangular battery cell 15. Of course, the above description is not restrictive, and in some alternative embodiments, the angles between the first liquid cooling plate 8, the second liquid cooling plate 9 and the end plate 7 can also be other conventional angles.

[0063] like Fig. 9 As shown, in this embodiment, the second structure of the liquid cooling plate 16 includes: a third liquid cooling plate 11 extending along the second direction Y, and the third liquid cooling plate 11 is connected to the second side wall 74 of the end plate 7.

[0064] like Fig.10 As shown, in a specific implementation of this embodiment, the flow channel 17 includes: a third flow channel 111 and a fourth flow channel 112, the third flow channel 111 and the fourth flow channel 112 are both arranged in the third liquid cooling plate 11, the third flow channel 111 is connected to the liquid inlet cavity 71, and the fourth flow channel 112 is connected to the liquid outlet cavity 72.

[0065] like Figure 3 As shown, in this embodiment, the Figure 4 As shown and Fig. 9 The two liquid cooling plates 16 structures shown are combined to form a plurality of liquid cooling components 1 assemblies capable of arranging the battery cells 15. Of course, the above description is not restrictive, and in some alternative embodiments, the plurality of liquid cooling components 1 may also include only one of the two liquid cooling plates 16 described above.

[0066] like Figure 3 As shown, in this embodiment, the battery pack further comprises a plurality of quick-connect plugs, one of which is inserted into the liquid inlet 5 and connected to the end plate 7, and another of which is inserted into the liquid outlet 6 and connected to the end plate 7. That is, the liquid inlet 5 and the liquid outlet 6 on the end plate 7 are respectively connected with quick-connect plugs, which are used for quick sealing connection with the flexible tube 2. Specifically, the quick-connect plugs can be conventional products on the market.

[0067] In addition, this embodiment further provides an electric device, including the battery pack described in the above embodiment. Specifically, the electric device may include a new energy electric vehicle, etc., and the battery pack may be used as a power battery for the electric device.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present utility model.

Claims

1. A battery pack having a first direction (X) and a second direction (Y) intersecting each other, characterized in that: include: A box body (10) is provided with a receiving chamber (101) therein; A plurality of liquid cooling components (1) are arranged in the accommodating cavity (101), the plurality of liquid cooling components (1) are arranged along a first direction (X), the liquid cooling components (1) comprising: an end plate (7) and a liquid cooling plate (16) connected to the end plate (7), the end plate (7) extending along the first direction (X), and the liquid cooling plate (16) extending along the second direction (Y); a liquid inlet (5) and a liquid outlet (6) are arranged at intervals on the end plate (7), a flow channel (17) is arranged inside the liquid cooling plate (16), and the liquid inlet (5) and the liquid outlet (6) are respectively connected to the flow channel (17); The flexible tube (2) is used for two adjacent end plates (7), and the liquid outlet (6) of one end plate (7) and the liquid inlet (5) of the other liquid cooling component (1) are connected through the flexible tube (2).

2. The battery pack according to claim 1, characterized in that: A liquid inlet cavity (71) and a liquid outlet cavity (72) are provided inside the end plate (7), and the liquid inlet cavity (71) and the liquid outlet cavity (72) are arranged at intervals; The liquid inlet cavity (71) and the liquid outlet cavity (72) are respectively connected to the flow channel (17); the liquid inlet (5) is connected to the liquid inlet cavity (71), and the liquid outlet (6) is connected to the liquid outlet cavity (72).

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises a battery cell (15), wherein the battery cell (15) is connected to the liquid cooling plate (16); The end plate (7) comprises a first side wall (73) and a second side wall (74) which are arranged opposite to each other along the second direction (Y); the second side wall (74) is arranged between the first side wall (73) and the battery cell (15); the liquid inlet (5) and the liquid outlet (6) both penetrate the first side wall (73) along the second direction (Y); and the liquid cooling plate (16) is connected to the second side wall (74).

4. The battery pack according to claim 3, characterized in that: The battery pack further has a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The end plate (7) further comprises a barrier wall (79), wherein the barrier wall (79) is respectively connected to the first side wall (73) and the second side wall (74) along the second direction (Y); along the third direction (Z), the liquid inlet (5) and the liquid outlet (6) are arranged on both sides of the barrier wall (79).

5. The battery pack according to claim 4, characterized in that: The end plate (7) further comprises a third side wall (75) and a fourth side wall (76) arranged opposite to each other along the first direction (X), and a first end wall (77) and a second end wall (78) arranged opposite to each other along the third direction (Z); along the third direction (Z), the barrier wall (79) is arranged between the first end wall (77) and the second end wall (78); The third side wall (75) and the fourth side wall (76) are respectively connected to the barrier wall (79); the first end wall (77) is respectively connected to the first side wall (73), the second side wall (74), the third side wall (75), and the fourth side wall (76); and the second end wall (78) is respectively connected to the first side wall (73), the second side wall (74), the third side wall (75), and the fourth side wall (76).

6. The battery pack according to claim 3, characterized in that: The liquid cooling plate (16) comprises a first liquid cooling plate (8) and a second liquid cooling plate (9) respectively extending along the second direction (Y), the side walls of the first liquid cooling plate (8) and the second liquid cooling plate (9) are connected, and the second liquid cooling plate (9) is connected to both the first liquid cooling plate (8) and the second side wall (74); a first flow channel (81) is provided inside the first liquid cooling plate (8), and a second flow channel (91) is provided inside the second liquid cooling plate (9), the first flow channel (81) is connected to the liquid inlet cavity (71), and the second flow channel (91) is connected to the liquid outlet cavity (72).

7. The battery pack according to claim 3, characterized in that: The liquid cooling plate (16) includes a third liquid cooling plate (11) extending along the second direction (Y), the third liquid cooling plate (11) being connected to the second side wall (74), and a third flow channel (111) and a fourth flow channel (112) being connected to each other are provided in the third liquid cooling plate (11), the third flow channel (111) being connected to the liquid inlet cavity (71), and the fourth flow channel (112) being connected to the liquid outlet cavity (72).

8. The battery pack according to claim 6, characterized in that: The first liquid cooling plate (8) and the second liquid cooling plate (9) are perpendicular to each other, and the first liquid cooling plate (8) and the second liquid cooling plate (9) are respectively perpendicular to the second side wall (74).

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery pack further comprises a plurality of quick-connect plugs, one of which is plugged into the liquid inlet (5) and connected to the end plate (7), and another of which is plugged into the liquid outlet (6) and connected to the end plate (7).

10. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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