Prismatic battery pack and electric device

Abstract

The invention relates to a prismatic battery pack and an electric device. The prismatic battery pack comprises a box body and a battery module, the box body is provided with a containing cavity, the battery module is located in the containing cavity, the battery module comprises a plurality of prismatic battery cells, and the adjacent prismatic battery cells are connected in an attached mode; the box body is provided with a liquid cooling flow channel, the outer surface of the liquid cooling flow channel is attached to the outer surfaces of the plurality of prism battery cells, and the outer surface of the liquid cooling flow channel is matched with the outer surfaces of the plurality of prism battery cells in shape. According to the prismatic battery pack provided by the invention, the structural strength of the prismatic battery pack can be improved; besides, the outer surface of the liquid cooling flow channel is attached to the outer surfaces of the plurality of prism battery cells, and the outer surface of the liquid cooling flow channel is matched with the outer surfaces of the plurality of prism battery cells in shape, so that the contact area of the liquid cooling flow channel and the prism battery cells can be greatly increased, and the cooling effect is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a prismatic battery pack and an electrical device. Background Art

[0002] Temperature is an important factor affecting the performance and safety of the battery pack, so the cooling effect of the cooling system in the battery pack is particularly important.

[0003] The shape of the liquid cooling channel on the market is based on the shape of the battery cell, most of which are square structures, circular structures, etc. One side of the liquid cooling channel is in contact with the battery cell shell. The coolant in the liquid cooling channel takes away the heat generated by the battery cell during the circulation process. Since the contact area between the liquid cooling channel and the battery cell shell is limited, the heat taken away by the coolant is also limited. Summary of the invention

[0004] In view of this, embodiments of the present application provide a prismatic battery pack and an electrical device to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a prismatic battery pack, the prismatic battery pack comprising: A box body having a containing cavity; A battery module is located in the accommodating cavity, wherein the battery module includes a plurality of prismatic cells, and adjacent prismatic cells are bonded and connected; The box body is provided with a liquid cooling channel, the outer surface of the liquid cooling channel fits the outer surfaces of the multiple prismatic battery cells, and the outer surface of the liquid cooling channel matches the shape of the outer surfaces of the multiple prismatic battery cells.

[0006] In conjunction with the first aspect of the present application, in an optional embodiment, the shape of the prismatic battery cell is a regular hexagonal prism; The prismatic cell comprises: a first prismatic cell, wherein a plurality of the first prismatic cells are connected in a first direction to form a first cell group, the first prismatic cells have first side surfaces facing each other in the first direction, adjacent first prismatic cells are bonded via the first side surfaces, and the first prismatic cells further have second side surfaces and third side surfaces facing each other; A second prismatic cell, a plurality of the second prismatic cells are connected in the first direction to form a second cell group, the second prismatic cells have fourth side surfaces facing each other in the first direction, adjacent second prismatic cells are bonded via the fourth side surfaces, the second prismatic cell also has a fifth side surface and a sixth side surface facing each other, the second side surface is bonded to the fifth side surface, and the third side surface is bonded to the sixth side surface in the second direction, and the second direction is perpendicular to the first direction.

[0007] In combination with the first aspect of the present application, in an optional implementation manner, the box body includes a bottom plate, a frame and an upper cover, and the bottom plate, the frame and the upper cover are arranged to form the accommodating cavity; The liquid cooling channel includes a first liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface.

[0008] In combination with the first aspect of the present application, in an optional implementation manner, the box body includes a bottom plate, a frame and an upper cover, the bottom plate, the frame and the upper cover are arranged to form the accommodating cavity, and the bottom plate and the upper cover are both profile structures; The liquid cooling channel includes a second liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The upper cover has the second liquid cooling channel, and the outer surface of the second liquid cooling channel is in contact with the second side surface and the third side surface.

[0009] In combination with the first aspect of the present application, in an optional implementation, insulating spacers are connected between adjacent prismatic cells and between the prismatic cells and the box.

[0010] In combination with the first aspect of the present application, in an optional implementation, an insulating adhesive is bonded between adjacent prismatic cells and between the prismatic cells and the box body, and the thickness of the spacer is equal to the thickness of the adhesive.

[0011] In conjunction with the first aspect of the present application, in an optional implementation, the liquid cooling channel includes: A plurality of first flow channels with openings at both ends extending along a third direction; A first blocking member connected to one end of the plurality of first flow channels, the first blocking member having a second flow channel and a water inlet, the water inlet being connected to the second flow channel; A second blocking member connected to the other end of the plurality of first flow channels, the second blocking member having a third flow channel and a water outlet, the water outlet being connected to the third flow channel; The coolant enters from the water inlet, flows through the second flow channel, the first flow channels and the third flow channel, and is discharged from the water outlet.

[0012] In combination with the first aspect of the present application, in an optional implementation, the cross-section of the first flow channel is an isosceles triangle structure.

[0013] In combination with the first aspect of the present application, in an optional embodiment, the first blocking member and the second blocking member have the same structure, and a plurality of triangular plates are provided on a side of the first blocking member close to the first flow channel, and the triangular plates are connected between adjacent first flow channels.

[0014] In a second aspect, an embodiment of the present application provides an electrical device, comprising a prismatic battery pack according to any embodiment provided in the first aspect.

[0015] The prismatic battery pack provided in the embodiment of the present application includes a battery module formed by a plurality of prismatic cells being bonded together, which can improve the structural strength of the prismatic battery pack; in addition, the outer surface of the liquid-cooling channel is bonded to the outer surfaces of the plurality of prismatic cells, and the outer surface of the liquid-cooling channel matches the shape of the outer surfaces of the plurality of prismatic cells, which can greatly increase the contact area between the liquid-cooling channel and the prismatic cells, thereby improving the cooling effect.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of the overall structure of a prismatic battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of a partial structural decomposition of a prismatic battery pack provided in an embodiment of the present application; Figure 3 A partially cutaway perspective schematic diagram of a prismatic battery pack provided in an embodiment of the present application; Figure 4 for Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 A schematic diagram of the structural decomposition of a prismatic cell in a prismatic battery pack provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of some prismatic cells, adhesives and spacers in a prismatic battery pack provided in an embodiment of the present application; Figure 7 for Figure 2 The enlarged view of point B in the middle; Figure 8 A schematic diagram of partial structural decomposition of a bottom plate and a first liquid cooling channel of the bottom plate in a prismatic battery pack provided in an embodiment of the present application; Fig. 9 for Figure 8 Enlarged view of point C in the middle; Fig.10 A partial structural schematic diagram of a prismatic battery pack provided in an embodiment of the present application.

[0018] Reference numerals: 100, prismatic battery pack; 10, housing; 1a, liquid cooling channel; 11a, first liquid cooling channel; 12a, second liquid cooling channel; 1a1, first channel; 1a2, first blocking member; 1a21, water inlet; 1a3, second blocking member; 1a31, water outlet; 1a32, triangular plate; 1a33, third channel; 110, bottom plate; 120, frame; 121, total water inlet; 122, total water outlet; 130, upper cover; 140, front compartment cover; 150, water outlet pipe; 20, battery module; 210, prismatic cell; 211, housing; 212, single cell; 21a, first prismatic cell; 21a1, first side surface; 21a2, second side surface; 21a3, third side surface; 21b, second prismatic cell; 21b1, fourth side surface; 21b2, fifth side surface; 21b3, sixth side surface; 230, spacer; 240, adhesive; 310. Connecting row; 320. Support; 40. Structural adhesive; 50. Sealing element. DETAILED DESCRIPTION

[0019] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope disclosed in the present application to those skilled in the art.

[0020] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0021] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0022] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0023] Spatial relationship terms such as "under", "below", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0024] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0025] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0026] like Figures 1 to 3 As shown, a prismatic battery pack 100 provided in an embodiment of the present application includes a box 10 and a battery module 20. The box 10 has a receiving cavity, and the battery module 20 is located in the receiving cavity. The battery module 20 includes a plurality of prismatic cells 210, and adjacent prismatic cells 210 are connected in affixed connection. The box 10 is provided with a liquid cooling channel 1a, and the outer surface of the liquid cooling channel 1a is in affixed connection with the outer surfaces of the plurality of prismatic cells 210, and the outer surface of the liquid cooling channel 1a matches the shape of the outer surfaces of the plurality of prismatic cells 210.

[0027] Figure 2 , Figure 3 and Figure 4 2 shows a prismatic battery cell 210 in the shape of a regular hexagonal prism. The cross section of a regular hexagonal prism is a regular hexagon, which has the characteristic of being closely paved on a plane. The fitting connection of multiple prismatic battery cells 210 in the shape of a regular hexagonal prism can reduce the distance between adjacent prismatic battery cells 210, improve the space utilization of the box 10, and also improve the connection stiffness of the battery module 20, thereby ensuring the structural strength of the prismatic battery pack 100. In addition, the regular hexagonal prism has a larger surface area, and the outer surface of the prismatic battery cell 210 matches and fits with the outer surface of the liquid-cooling channel 1a, which increases the contact area between the liquid-cooling channel 1a and the prismatic battery cell 210, thereby greatly improving the heat dissipation effect of the prismatic battery cell 210.

[0028] Of course, the shape of the prismatic cell 210 is not limited to a regular hexagonal prism. The shape of the prismatic cell 210 can also be a pentagonal prism, an octagonal prism, a decagonal prism, etc., which can be set according to specific needs and is not limited in the embodiments of the present application.

[0029] In an alternative embodiment, if Figure 3 and Figure 4 As shown, the prismatic cell 210 is Figure 3 The prismatic cell 210 extends in the direction of the arrow s3 shown in FIG. 1 , and includes a first prismatic cell 21 a and a second prismatic cell 21 b .

[0030] Among them, the plurality of first prismatic cells 21a are arranged in a first direction. Figure 3 The first prismatic cells 21a are connected in the direction of arrow s1 shown in the figure to form a first cell group. The first prismatic cells 21a have first side faces 21a1 facing each other in the first direction. Adjacent first prismatic cells 21a are bonded together through the first side faces 21a1. The first prismatic cells 21a also have second side faces 21a2 and third side faces 21a3 facing each other.

[0031] The plurality of second prismatic cells 21b are arranged in a first direction. Figure 3 The second prismatic cells 21b are connected in the direction of arrow s1 shown in the figure to form a second cell group. The second prismatic cells 21b have fourth side surfaces 21b1 facing each other in the first direction. Adjacent second prismatic cells 21b are attached via the fourth side surfaces 21b1. The second prismatic cells 21b also have fifth side surfaces 21b2 and sixth side surfaces 21b3 facing each other. Figure 3 In the direction of arrow s2 shown in FIG. 1 , the second side surface 21a2 is in contact with the fifth side surface 21b2, and the third side surface 21a3 is in contact with the sixth side surface 21b3, and the second direction is perpendicular to the first direction.

[0032] In an alternative embodiment, if Figures 1 to 4 As shown, the box body 10 includes a bottom plate 110, a frame 120 and an upper cover 130. The bottom plate 110, the frame 120 and the upper cover 130 are arranged to form a receiving cavity, and the battery module 20 is located in the receiving cavity.

[0033] The liquid cooling channel 1a includes a first liquid cooling channel 11a, and the first liquid cooling channel 11a is along the third direction, that is, Figure 3 The third direction extends in the direction of arrow s3 shown in the figure, and the third direction is perpendicular to the first direction and the second direction. The bottom plate 110 has a first liquid-cooling channel 11a, and the outer surface of the first liquid-cooling channel 11a is attached to the fifth side 21b2 and the sixth side 21b3 of the second prismatic battery cell 21b.

[0034] In an optional embodiment, the liquid cooling channel 1a includes a second liquid cooling channel 12a, and the second liquid cooling channel 12a is along the third direction. Figure 3 The upper cover 130 extends in the direction of the arrow s3 shown in FIG. 1 , and has a second liquid-cooling channel 12a , and the outer surface of the second liquid-cooling channel 12a is in contact with the second side surface 21a2 and the third side surface 21a3 .

[0035] A second liquid cooling channel 12a and a first liquid cooling channel 11a are respectively provided on the upper cover 130 and the bottom plate 110, and the second liquid cooling channel 12a is fitted and connected to the first prismatic cell 21a, and the first liquid cooling channel 11a is fitted and connected to the second prismatic cell 21b, which can increase the contact area between the prismatic cell 210 and the liquid cooling channel 1a and improve the heat dissipation effect of the prismatic cell 210.

[0036] Figure 42 shows that the second side 21a2 and the third side 21a3 of the first prismatic cell 21a are both attached to the second liquid cooling channel 12a, and the fifth side 21b2 and the sixth side 21b3 of the second prismatic cell 21b are both attached to the first liquid cooling channel 11a. It can be understood that the liquid cooling channel 1a has a contoured structure that matches the side of the prismatic cell 210, which can increase the contact area between the liquid cooling channel 1a and the prismatic cell 210, thereby improving the heat dissipation capacity of the prismatic battery pack 100.

[0037] In addition, adjacent first prismatic cells 21a, adjacent second prismatic cells 21b, and adjacent first prismatic cells 21a and second prismatic cells 21b are all directly facing and connected, which not only facilitates the formation of multiple first cell groups and multiple second cell groups, but also can improve the structural strength of the battery module 20.

[0038] In an optional embodiment, the bottom plate 110 and the upper cover 130 are both profile structures. The bottom plate 110 and the upper cover 130 both have a channel with a rectangular cross section, which can improve the heat dissipation effect of the prismatic battery cell 210, and the profile structure has the characteristics of light weight and high strength, which improves the overall stability and safety of the prismatic battery pack 100.

[0039] like Figure 5 As shown, the prismatic cell 210 includes a shell 211 and a plurality of single cells 212, and the plurality of single cells 212 are connected inside the shell 211 along the axial direction of the shell 211. The first pole and the second pole of the prismatic cell 210 are arranged at one end of the shell 211, and the first pole and the second pole are respectively positive and negative poles. The first pole is connected to the shell 211, and the shell 211 is made of steel or aluminum. The outer surface of the shell 211 has an insulating layer (not shown in the figure), and the insulating layer is coated on the side and end face of the prism, and the end face with the first pole and the second pole is not coated with the insulating layer. The insulating layer is an insulating film, a resin spray material, a UV light curing material, etc.

[0040] In an alternative embodiment, if Figure 6 As shown, insulating spacers 230 are connected between adjacent prismatic cells 210 and between the prismatic cells 210 and the box 10. Spacers 230 are connected between adjacent prismatic cells 210, between the bottom plate 110 and the prismatic cells 210, and between the upper cover 130 and the prismatic cells 210. The spacers 230 can limit the thickness of the adhesive 240. The spacers are made of rigid materials, such as PC hard materials, but are not limited thereto.

[0041] In an optional embodiment, an insulating adhesive 240 is further bonded between adjacent prismatic cells 210 and between the prismatic cells 210 and the box body 10 , and the thickness of the spacer 230 is equal to the thickness of the adhesive 240 .

[0042] The adhesive 240 is used to connect between adjacent prismatic cells 210 , between the prismatic cell 210 and the bottom plate 110 , and between the prismatic cell 210 and the top cover 130 . The adhesive 240 is used to fix adjacent prismatic cells 210 , between the prismatic cell 210 and the bottom plate 110 , and between the prismatic cell 210 and the top cover 130 , which can improve the overall structural strength of the prismatic battery pack 100 .

[0043] The adhesive 240 is connected to a part of the housing 211, namely the adhesive area. The area of ​​the adhesive 240 area is not limited and can be set according to specific circumstances. The adhesive 240 area corresponds to the exposed area of ​​the insulating layer. The exposed area is used for the adhesive 240 connection to improve the bonding strength.

[0044] Figure 7 The figure shows a connector connected to one end of the prismatic cell 210, which includes a high-voltage connection bar 310 and a support 320. The high-voltage connection bar 310 is connected to one end of the prismatic cell 210 by welding, and is connected to the first pole and the second pole. Multiple high-voltage connection bars 310 are connected to the support 320 to form a cell module.

[0045] In an alternative embodiment, if Figure 2 As shown, the prismatic battery pack 100 further includes a structural adhesive 40, which is filled in the gap between the prismatic cell 210 and the box body 10, and is used for bonding and fixing the prismatic cell 210. After potting, the prismatic cell 210 can effectively prevent the leakage of coolant and the generation of condensed water.

[0046] The prismatic battery pack 100 further includes a seal 50 , which is connected between the frame 120 and the upper cover 130 , and between the frame 120 and the bottom plate 110 , and is used to seal the accommodating cavity.

[0047] In an alternative embodiment, if Figure 8 and Fig. 9 As shown, the liquid cooling channel 1a includes a plurality of openings at both ends along the third direction, i.e. Figure 8 The first flow channel 1a1, the first blocking member 1a2 and the second blocking member 1a3 extending in the direction of the arrow s3 shown in FIG. The first blocking member 1a2 is connected to one end of the plurality of first flow channels 1a1, and the first blocking member 1a2 has a second flow channel and a water inlet 1a21, and the water inlet 1a21 is connected to the second flow channel. The second blocking member 1a3 is connected to the other end of the plurality of first flow channels 1a1, and the second blocking member 1a3 has a third flow channel 1a33 and a water outlet 1a31, and the water outlet 1a31 is connected to the third flow channel 1a33.

[0048] The coolant enters the second flow channel of the first blocking member 1a2 from the water inlet 1a21 and flows along the Figure 8The coolant flows in the direction of arrow s1 shown in FIG. 1 and flows into a plurality of first flow channels 1a1. The coolant flows in the first flow channels 1a1 along Figure 8 The water flows in the direction of arrow s3 shown in the figure, and finally flows into the third flow channel 1a33 and is discharged from the water outlet 1a31.

[0049] In an optional embodiment, the cross section of the first flow channel 1a1 is an isosceles triangle. The first flow channel 1a1 with an isosceles triangle cross section can, on the one hand, be used to match the prismatic battery cell 210 with a hexagonal prism structure to increase the contact area between the prismatic battery cell 210 and the first flow channel 1a1; on the other hand, the first flow channel 1a1 with this structure has a strong structural strength, which can further ensure the structural stability and safety of the prismatic battery pack 100.

[0050] In an alternative embodiment, if Fig. 9 As shown, the first blocking member 1a2 has the same structure as the second blocking member 1a3. A plurality of triangular plates 1a32 are provided on one side of the first blocking member 1a2 close to the first flow channel 1a1. The triangular plates 1a32 are connected between adjacent first flow channels 1a1.

[0051] The triangular plate 1a32 is used to make the first sealing member 1a2 match the opening of the first flow channel 1a1, so as to seal the first flow channel 1a1 and the second flow channel, and the first flow channel 1a1 and the third flow channel 1a33, and to improve the structural stability of the first sealing member 1a2 and the first flow channel 1a1, and the second sealing member 1a3 and the first flow channel 1a1.

[0052] Fig.10 The figure shows the second liquid cooling channel 12a of the upper cover 130 and the first liquid cooling channel 11a of the bottom plate 110. One end of the second liquid cooling channel 12a and the first liquid cooling channel 11a are connected to the total water outlet 122 through the water outlet pipe 150. Of course, the other ends of the second liquid cooling channel 12a and the first liquid cooling channel 11a are connected to the total water inlet 121 through the water inlet pipe (not shown in the figure).

[0053] like Figure 2 As shown, the box body 10 further includes a front compartment cover 140, which is detachably connected to the frame 120. The space formed by the front compartment cover 140 and the frame 120 is used to install electrical components. The detachable front compartment cover 140 facilitates the maintenance of the electrical components.

[0054] The embodiments of the present application also include an electrical device, including the prismatic battery pack 100 provided in any of the above embodiments.

[0055] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A prismatic battery pack, characterized in that: include: A box body having a containing cavity; A battery module is located in the accommodating cavity, wherein the battery module includes a plurality of prismatic cells, and adjacent prismatic cells are bonded and connected; The box body is provided with a liquid cooling channel, the outer surface of the liquid cooling channel fits the outer surfaces of the multiple prismatic battery cells, and the outer surface of the liquid cooling channel matches the shape of the outer surfaces of the multiple prismatic battery cells.

2. The prismatic battery pack according to claim 1, characterized in that: The shape of the prismatic battery cell is a regular hexagonal prism; The prismatic cell comprises: a first prismatic cell, wherein a plurality of the first prismatic cells are connected in a first direction to form a first cell group, the first prismatic cells have first side surfaces facing each other in the first direction, adjacent first prismatic cells are bonded via the first side surfaces, and the first prismatic cells further have second side surfaces and third side surfaces facing each other; A second prismatic cell, a plurality of the second prismatic cells are connected in the first direction to form a second cell group, the second prismatic cells have fourth side surfaces facing each other in the first direction, adjacent second prismatic cells are bonded via the fourth side surfaces, the second prismatic cell also has a fifth side surface and a sixth side surface facing each other, the second side surface is bonded to the fifth side surface, and the third side surface is bonded to the sixth side surface in the second direction, and the second direction is perpendicular to the first direction.

3. The prismatic battery pack according to claim 2, characterized in that: The box body comprises a bottom plate, a frame and an upper cover, wherein the bottom plate, the frame and the upper cover are arranged to form the accommodating cavity; The liquid cooling channel includes a first liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The bottom plate has the first liquid cooling channel, and the outer surface of the first liquid cooling channel is in contact with the fifth side surface and the sixth side surface.

4. The prismatic battery pack according to claim 2 or 3, characterized in that: The box body comprises a bottom plate, a frame and an upper cover, wherein the bottom plate, the frame and the upper cover are arranged to form the accommodating cavity, and both the bottom plate and the upper cover are profile structures; The liquid cooling channel includes a second liquid cooling channel, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction. The upper cover has the second liquid cooling channel, and the outer surface of the second liquid cooling channel is in contact with the second side surface and the third side surface.

5. The prismatic battery pack according to claim 1, wherein: Insulating spacers are connected between adjacent prismatic cells and between the prismatic cells and the box.

6. The prismatic battery pack according to claim 5, characterized in that: An insulating adhesive is also bonded between adjacent prismatic cells and between the prismatic cells and the box body, and the thickness of the spacer is equal to the thickness of the adhesive.

7. The prismatic battery pack according to claim 1, wherein: The liquid cooling channel comprises: A plurality of first flow channels with openings at both ends extending along a third direction; A first blocking member connected to one end of the plurality of first flow channels, the first blocking member having a second flow channel and a water inlet, the water inlet being connected to the second flow channel; A second blocking member connected to the other end of the plurality of first flow channels, the second blocking member having a third flow channel and a water outlet, the water outlet being connected to the third flow channel; The coolant enters from the water inlet, flows through the second flow channel, the first flow channels and the third flow channel, and is discharged from the water outlet.

8. The prismatic battery pack according to claim 7, wherein: The cross section of the first flow channel is an isosceles triangle structure.

9. The prismatic battery pack according to claim 7 or 8, characterized in that: The first blocking member and the second blocking member have the same structure. A plurality of triangular plates are provided on one side of the first blocking member close to the first flow channel, and the triangular plates are connected between adjacent first flow channels.

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

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