Battery packs and electrical devices

Abstract

This utility model relates to the field of batteries and discloses a battery pack and an electrical device. The battery pack includes: a housing, including a bottom plate with a load-bearing surface; and multiple battery cells arranged within the housing. Each battery cell includes a bottom surface and two side surfaces. Along the arrangement direction of the multiple battery cells, the two side surfaces are respectively connected to opposite sides of the bottom surface. The bottom surface is parallel to and connected to the load-bearing surface, and the two side surfaces are parallel and inclined relative to the bottom surface. When the vehicle's undercarriage is impacted, the inclined battery cells can disperse some of the impact force, reduce the degree of battery cell deformation, and lower the risk of battery cell cracking, thereby improving battery cell safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs and electrical devices. Background Technology

[0002] With the development of new energy technologies, higher requirements have been placed on the safety of battery packs installed in vehicles. Typically, battery packs are installed at the bottom of the vehicle; if the bottom drags on the ground during driving, the battery pack can be severely damaged, creating a safety hazard. Utility Model Content

[0003] In view of this, the present invention provides a battery pack and power supply device to solve the problem of the battery pack being severely damaged due to dragging on the bottom of the vehicle, which causes installation hazards.

[0004] In a first aspect, the present invention provides a battery pack, comprising: a housing, including a bottom plate having a bearing surface; a plurality of battery cells disposed within the housing, the plurality of battery cells being arranged in a manner, each battery cell including a bottom surface and two side surfaces, the two side surfaces being respectively connected to opposite sides of the bottom surface along the arrangement direction of the plurality of battery cells, the bottom surface being parallel to and connected to the bearing surface, and the two side surfaces being parallel and inclined relative to the bottom surface.

[0005] Beneficial effects: By setting the side of the battery cell at an angle relative to the bottom surface, and making the bottom surface parallel to the bearing surface of the base plate, the battery cell is set at an angle relative to the base plate. When the bottom plate of the vehicle is impacted, the angled battery cell can disperse part of the impact force, reduce the degree of battery cell deformation, reduce the risk of battery cell cracking, and thus improve battery cell safety.

[0006] In one optional embodiment, the included angle between the side surface and the bottom surface is A, satisfying: 20°≤A≤75°.

[0007] Beneficial effects: When A is greater than or equal to 20°, the tilt angle of the battery cell relative to the base plate is increased. When the battery cell drags on the underside of the vehicle, it can disperse more impact force, reduce the degree of cell deformation, lower the risk of cell cracking, and improve cell safety. When A is less than or equal to 75°, the tilt angle of the battery cell relative to the base plate is not too large. An excessively large tilt angle can easily lead to wasted space on both sides of the battery pack along the X-direction. Therefore, A less than or equal to 75° can improve the space utilization of the battery pack and increase the volumetric energy density of the battery pack. Therefore, 20°≤A≤75° can disperse more impact force, reduce the degree of cell deformation, lower the risk of cell cracking, improve cell safety, and also improve the space utilization of the battery pack and increase the volumetric energy density of the battery pack.

[0008] In one optional embodiment, the housing further includes two first side beams, which are connected to opposite sides of the base plate along the arrangement direction. The two inner sides of the two first side beams are both first inclined surfaces and contact and abut against the nearest side surface.

[0009] Beneficial effects: The first inclined surface is parallel to and abuts against the side surface, and the two achieve a surface contact and fit connection, so that multiple battery cells are tightly squeezed between the two first side beams, improving the strength of the battery cells.

[0010] In one alternative embodiment, the first inclined surface is inclined relative to the outer surface of the first side beam, and the outer surface of the first side beam is a vertical surface.

[0011] Beneficial effects: When the first side beam of the housing is subjected to an impact force along the arrangement direction, since the outer side is a vertical surface, the first inclined surface, which is the inner side, is set at an angle relative to the outer side. The side of the battery cell is parallel to the first inclined surface, which disperses the impact force transmitted to the side of the battery cell. This reduces the degree of battery cell deformation, lowers the risk of battery cell cracking, and improves battery cell safety.

[0012] In one optional embodiment, the housing further includes a central beam located between two first side beams along the arrangement direction. The central beam includes a second inclined surface and a third inclined surface arranged opposite to each other. Along the arrangement direction, a plurality of battery cells are arranged into a first battery cell row and a second battery cell row. The sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are inclined towards the central beam, or the sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are inclined towards the same side of the arrangement direction, or the sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are inclined towards directions away from each other. The second inclined surface is parallel to the side of the battery cells in the first battery cell row and abuts against the nearest side. The third inclined surface is parallel to the side of the battery cells in the second battery cell row and abuts against the nearest side.

[0013] Beneficial effects: The sides of the cells in the first cell row and the sides of the cells in the second cell row are tilted toward the central beam, which makes the center of gravity of multiple cells as a whole closer to the central beam, improving the stability of the battery pack when it is mounted on the vehicle.

[0014] In one optional embodiment, the housing further includes two second side beams, each second side beam being connected to two first side beams at both ends along the arrangement direction, and at least one second side beam being provided with an exhaust channel; the battery cell further includes two end faces along both sides of a first direction, and at least one end face being provided with a pressure relief mechanism corresponding to the exhaust channel, the first direction being perpendicular to the arrangement direction.

[0015] Beneficial effect: The second side beam is equipped with an exhaust channel corresponding to the pressure relief mechanism on the battery cell, which enables the gas and other substances inside the battery cell to be discharged smoothly when thermal runaway occurs.

[0016] In one optional embodiment, the battery cell further includes a top surface opposite to the bottom surface along a second direction, the top surface being parallel to the bottom surface, and the two ends of the top surface being respectively connected to two side surfaces, wherein the area of ​​the side surfaces is greater than the area of ​​any one of the bottom surface, the top surface, and the end surface, and the second direction, the first direction, and the arrangement direction are perpendicular to each other; along the arrangement direction, the side surfaces of two adjacent battery cells abut against each other.

[0017] Beneficial effects: Arranging multiple battery cells face-to-face on the sides (large surface) can suppress shaking between battery cells and improve cell stability.

[0018] In one optional embodiment, the length of the battery cell along the first direction is L, the width of the battery cell along the second direction is W, and the thickness of the battery cell along the arrangement direction is D, satisfying that 200mm≤L≤1200mm, 50mm≤W≤150mm, and 15mm≤D≤60mm.

[0019] Beneficial effects: The battery cells of the above dimensions are blade batteries. Blade batteries are relatively long, making them more prone to deformation and cracking upon impact. Therefore, for blade batteries, by tilting the sides relative to the bottom surface, with the bottom surface parallel to the load-bearing surface of the base plate, the entire battery cell is tilted relative to the base plate. When the battery cell is impacted while dragging on the bottom plate of the vehicle, the tilted design can disperse some of the impact force, reducing the degree of cell deformation and lowering the risk of cracking, thereby improving the safety of blade batteries.

[0020] Secondly, this utility model also provides an electrical device, including the battery pack described in any embodiment of the first aspect.

[0021] Beneficial effects: Since the electrical device includes the battery pack mentioned in the first aspect, it has the same beneficial effects as the battery pack, which will not be elaborated here. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the box body according to an embodiment of the present utility model;

[0026] Figure 4 for Figure 1 Cross-sectional view cut along EE;

[0027] Figure 5 for Figure 4 Enlarged schematic diagram of the middle section structure.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100-battery pack;

[0030] 10-Box body; 11-Bottom plate; 111-Bearing surface; 12-First side beam; 121-First inclined surface; 122-Outer side surface; 13-Intermediate beam; 131-Second inclined surface; 132-Third inclined surface; 14-Second side beam; 141-Exhaust passage; 15-Pressure relief port;

[0031] 20-Cell; 21-Bottom; 22-Side; 23-End; 24-Top; 201-First cell array; 202-Second cell array;

[0032] 30 - Pressure relief mechanism;

[0033] X - Arrangement direction; Y - First direction; Z - Second direction. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] The battery pack is installed at the bottom of the vehicle. If the bottom drags on the ground during driving, it can cause serious damage to the battery pack, creating a safety hazard. In a conventional battery pack, the cells are arranged with their bottom surface perpendicular to the load-bearing surface of the pack. When the bottom drags on the ground and is impacted, the impact force is directly applied to the cells, causing severe deformation and even cracking, posing a safety risk. This is especially true for blade-shaped battery cells, which are more prone to deformation upon impact due to their longer length.

[0036] To address this, by arranging the battery cells with their bottom surface tilted relative to the load-bearing surface of the casing, when the bottom is dragged on the ground and subjected to impact, the tilted battery cells can disperse some of the impact force, reduce the degree of battery cell deformation, lower the risk of battery cell cracking, and thus improve battery cell safety.

[0037] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, in a first aspect, a battery pack 100 is provided, including a housing 10 and a plurality of battery cells 20. The housing 10 includes a bottom plate 11, which has a bearing surface 111. The plurality of battery cells 20 are disposed within the housing 10 and arranged in a plurality of manner. Each battery cell 20 includes a bottom surface 21 and two side surfaces 22. Along the arrangement direction X of the plurality of battery cells 20, the two side surfaces 22 are respectively connected to opposite sides of the bottom surface 21. The bottom surface 21 is parallel to and connected to the bearing surface 111, and the two side surfaces 22 are parallel and inclined relative to the bottom surface 21.

[0039] Understandably, the bottom surface 21 and the side surface 22 are both outer surfaces of the battery cell 20 casing.

[0040] The bottom surface 21 and the bearing surface 111 can be directly bonded to the bearing surface 111 through an adhesive layer. The bearing surface 111 of the base plate 11 and the bottom surface of the battery cell 20 can be horizontal surfaces.

[0041] Multiple battery cells 20 can be arranged face-to-face with their sides 22 together. The side 22 can be the largest surface area among all the surfaces of the battery cell 20, i.e., the so-called "large surface". As an example, the battery cell 20 also includes a top surface 24 opposite the bottom surface 21 along the second direction Z. The top surface 24 can be parallel to the bottom surface 21, thus forming a parallelogram structure with the bottom surface 21, the top surface 24, and the two side surfaces 22. The battery cell 20 can be a blade battery cell, a prismatic battery cell, etc.

[0042] The side surface 22 is inclined relative to the bottom surface 21, meaning that the side surface 22 is not perpendicular to the bottom surface 21, and the inclination angle can be acute or obtuse.

[0043] By tilting the side 22 of the battery cell 20 relative to the bottom surface 21, and with the bottom surface 21 parallel to the bearing surface 111 of the base plate 11, the battery cell 20 is tilted relative to the base plate 11. When the base plate 11 is impacted at the bottom of the vehicle, the tilted battery cell 20 can disperse part of the impact force, reduce the degree of deformation of the battery cell 20, reduce the risk of cracking of the battery cell 20, and thus improve the safety of the battery cell 20.

[0044] In some embodiments, refer to Figure 5 The angle between the side surface 22 and the bottom surface 21 is A, which satisfies: 20°≤A≤75°. A can be 20°, 25°, 30°, 34°, 37°, 40°, 45°, 50°, 65°, 70°, 75° or any value between the two.

[0045] Preferably, 30°≤A≤40°. A can be 30°, 31°, 33°, 34°, 35°, 37°, 38°, 39°, 40° or any value between the two.

[0046] When A is greater than or equal to 20°, the tilt angle of the battery cell 20 relative to the base plate 11 is increased. When the battery cell 20 drags on the base plate 11 at the bottom of the vehicle, more impact force can be dispersed, reducing the deformation of the battery cell 20, lowering the risk of cracking, and improving the safety of the battery cell 20. When A is less than or equal to 75°, the tilt angle of the battery cell 20 relative to the base plate 11 is not too large. An excessively large tilt angle can easily lead to wasted space on both sides of the housing 10 along the X-direction. Therefore, A is less than or equal to 75°, which can improve the space utilization of the housing 10 and increase the volumetric energy density of the battery pack 100. Therefore, 20°≤A≤75° can disperse more impact force, reduce the deformation of the battery cell 20, lower the risk of cracking, improve the safety of the battery cell 20, and also improve the space utilization of the housing 10 and increase the volumetric energy density of the battery pack 100.

[0047] In some embodiments, refer to Figure 3 , Figure 4 and Figure 5 The housing 10 also includes two first side beams 12 arranged in the X direction. The two first side beams 12 are connected to opposite sides of the base plate 11. The two inner surfaces of the two first side beams 12 are both first inclined surfaces 121, and they contact and abut against the nearest side surface 22. As an example, Figure 4 In the middle, the first inclined surface 121 on the left is parallel to the side surface 22 of the cell 20 in the first cell array 201 on the left. The first inclined surface 121 on the right is parallel to the side surface 22 of the cell 20 in the second cell array 202 on the right.

[0048] The nearest side 22 refers to the side 22 of the battery cell 20 closest to the first inclined surface 121 along the arrangement direction X, which faces the first inclined surface 121. For example... Figure 5 In the diagram, the side 22 of the leftmost cell 20 facing the first inclined plane 121 on the left is the side 22 closest to the first inclined plane 121 on the left. Similarly, the side 22 of the rightmost cell 20 facing the first inclined plane 121 on the right is the side 22 closest to the first inclined plane 121 on the right.

[0049] The first inclined surface 121 is parallel to and abuts against the side surface 22, and the two achieve a surface contact and fit connection, so that multiple battery cells 20 are tightly squeezed between the two first side beams 12, thereby improving the firmness of the battery cells 20.

[0050] In some embodiments, the first inclined surface 121 is inclined relative to the outer surface 122 of the first side beam 12, and the outer surface 122 of the first side beam 12 is a vertical surface. The first inclined surface 121 is inclined relative to the outer surface 122 of the first side beam 12, that is, the first inclined surface 121 and the outer surface 122 are not parallel.

[0051] As an example, the parameter Figure 4 and Figure 5 The cross-section of the first side beam 12 can be roughly wedge-shaped.

[0052] When the first side beam 12 of the housing 10 is subjected to an impact force along the arrangement direction X, since the outer side 122 is a vertical surface, the first inclined surface 121, which is the inner side surface, is inclined relative to the outer side 122. The side surface 22 of the battery cell 20 is parallel to the first inclined surface 121, so that the impact force transmitted to the side surface 22 of the battery cell 20 is dispersed, thereby reducing the degree of deformation of the battery cell 20, reducing the risk of cracking of the battery cell 20, and improving the safety of the battery cell 20.

[0053] In some embodiments, refer to Figure 4 The housing 10 also includes a central beam 13. Along the arrangement direction X, the central beam 13 is located between two first side beams 12. The central beam 13 includes a second inclined surface 131 and a third inclined surface 132 arranged opposite to each other. Along the arrangement direction X, multiple battery cells 20 are arranged into a first battery cell row 201 and a second battery cell row 202 located on both sides of the central beam 13. The side surfaces 22 of the battery cells 20 in the first battery cell row 201 and the second battery cell row 202 are inclined towards the central beam 13. The second inclined surface 131 is parallel to the side surface 22 of the battery cells 20 in the first battery cell row 201 and abuts against the nearest side surface 22. The third inclined surface 132 is parallel to the side surface 22 of the battery cells 20 in the second battery cell row 202 and abuts against the nearest side surface 22.

[0054] The intermediate beam 13 divides the interior space of the housing 10 into two accommodating spaces, which respectively accommodate the first battery cell array 201 and the second battery cell array 202. The first battery cell array 201 and the second battery cell array 202 each contain multiple battery cells 20. The intermediate beam 13 can be located at the midpoint between the two first side beams 12.

[0055] The inclination of the side 22 of the battery cell 20 in the first battery cell array 201 and the side 22 of the battery cell 20 in the second battery cell array 202 towards the intermediate beam 13 can be understood as follows: the distance between the side 22 of the battery cell 20 in the first battery cell array 201 near the bottom plate 11 and the second inclined surface 131 is less than the distance between the side 22 of the battery cell 20 in the second battery cell array 202 and the third inclined surface 132 is less than the distance between the side 22 of the battery cell 20 in the second battery cell array 202 and the third inclined surface 132. In other words, the first battery cell array 201 and the second battery cell array 202 tend to converge towards the intermediate beam 13. At this time, the distance between the second inclined surface 131 and the third inclined surface 132 gradually decreases from bottom to top.

[0056] This allows the center of gravity of the multiple battery cells 20 to be closer to the central beam 13, improving the stability of the battery pack 100 during vehicle movement.

[0057] In other embodiments, the side surface 22 of the cell 20 in the first cell array 201 and the side surface 22 of the cell 20 in the second cell array 202 are inclined toward the same side of the arrangement direction X (e.g., left or right). In this embodiment, the second inclined surface 131 and the third inclined surface 132 of the intermediate beam 13 are parallel to the side surface 22.

[0058] In some other embodiments, the side surfaces 22 of the cells 20 in the first cell array 201 and the second cell array 202 are inclined in directions away from each other. For example, the side surface 22 of the cells 20 in the first cell array 201 on the left is inclined to the left, and the side surface 22 of the cells 20 in the second cell array 202 on the right is inclined to the right. In this embodiment, the second inclined surface 131 of the intermediate beam 13 is parallel to the side surface 22 of the cells 20 in the first cell array 201, and the third inclined surface 132 of the intermediate beam 13 is parallel to the side surface 22 of the cells 20 in the second cell array 202. The distance between the second inclined surface 131 and the third inclined surface 132 gradually increases from bottom to top.

[0059] In some embodiments, refer to Figure 2 and Figure 3The housing 10 also includes two second side beams 14, each second side beam 14 being connected to two first side beams 12 at both ends along the arrangement direction X. At least one second side beam 14 is provided with an exhaust channel 141. The battery cell 20 also includes two end faces 23 on both sides along the first direction Y. At least one end face 23 is provided with a pressure relief mechanism 30 corresponding to the exhaust channel 141. The first direction Y is perpendicular to the arrangement direction X. The first direction Y can be the length direction of the battery cell 20.

[0060] The end face 23 can be perpendicular to the bottom face 21. Each pressure relief mechanism 30 can correspond to one exhaust channel 141, and multiple exhaust channels 141 can converge at the pressure relief port 15 on the box body 10 through the flow channel structure inside the box body 10. The pressure relief mechanism 30 can be an explosion-proof valve or a weak structure on the end face 23, etc.

[0061] The second side beam 14 is provided with an exhaust channel 141 corresponding to the pressure relief mechanism 30 on the battery cell 20, so that when thermal runaway occurs in the battery cell 20, the gas and other substances inside the battery cell 20 can be discharged smoothly.

[0062] In some embodiments, the battery cell 20 further includes a top surface 24 opposite to the bottom surface 21 along the second direction Z. The top surface 24 is parallel to the bottom surface 21, and two side surfaces 22 are respectively connected to the two ends of the top surface 24. The area of ​​the side surface 22 is larger than the area of ​​any one of the bottom surface 21, the top surface 24, and the end surface 23. The second direction Z, the first direction Y, and the arrangement direction X are perpendicular to each other. Along the arrangement direction X, the side surfaces 22 of two adjacent battery cells 20 abut against each other.

[0063] A pole post can be set on the top surface 24 so that the pole post and the pressure relief mechanism 30 are located on different surfaces, thereby achieving thermoelectric separation.

[0064] In some embodiments, the length of the battery cell 20 along the first direction Y is L, the width of the battery cell 20 along the second direction Z is W, and the thickness of the battery cell 20 along the arrangement direction X is D, satisfying that 200mm≤L≤1200mm, 50mm≤W≤150mm, and 15mm≤D≤60mm.

[0065] The battery cell 20 of the aforementioned dimensions is a blade battery cell. Blade batteries are relatively long and are more prone to deformation upon impact, increasing the risk of cracking. Therefore, for blade batteries, by tilting the side 22 relative to the bottom 21, with the bottom 21 parallel to the bearing surface 111 of the base plate 11, the battery cell 20 is tilted relative to the base plate 11. When the base plate 11 is impacted at the bottom of the vehicle, the tilted battery cell 20 can disperse some of the impact force, reducing the degree of deformation and the risk of cracking, thereby improving the safety of the blade battery cell 20.

[0066] According to an embodiment of the present invention, in a second aspect, an electrical device is also provided, including a battery pack 100 according to any embodiment of the first aspect.

[0067] Electrical devices can be vehicles, which can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc.

[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized by, include: The enclosure includes a base plate with a load-bearing surface; Multiple battery cells are disposed within the housing. The multiple battery cells are arranged in a specific order. Each battery cell includes a bottom surface and two side surfaces. Along the arrangement direction of the multiple battery cells, the two side surfaces are respectively connected to opposite sides of the bottom surface. The bottom surface is parallel to and connected to the bearing surface. The two side surfaces are parallel to and inclined relative to the bottom surface.

2. The battery pack according to claim 1, characterized in that, The angle between the side surface and the bottom surface is A, which satisfies: 20°≤A≤75°.

3. The battery pack according to claim 1, characterized in that, The housing also includes two first side beams. Along the arrangement direction, the two first side beams are connected to opposite sides of the bottom plate. The two inner sides of the two first side beams are both first inclined surfaces and contact and abut against the nearest side surface.

4. The battery pack according to claim 3, characterized in that, The first inclined surface is inclined relative to the outer surface of the first side beam, and the outer surface of the first side beam is a vertical surface.

5. The battery pack according to claim 3, characterized in that, The box body also includes a middle beam, which is located between two first side beams along the arrangement direction. The middle beam includes a second inclined surface and a third inclined surface arranged opposite to each other. Along the arrangement direction, a plurality of battery cells are arranged into a first battery cell row and a second battery cell row located on both sides of the intermediate beam. The sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are respectively inclined toward the intermediate beam, or the sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are inclined toward the same side of the arrangement direction, or the sides of the battery cells in the first battery cell row and the sides of the battery cells in the second battery cell row are inclined toward directions away from each other. The second inclined surface is parallel to the side surface of the cell in the first cell array and abuts against the nearest side surface; the third inclined surface is parallel to the side surface of the cell in the second cell array and abuts against the nearest side surface.

6. The battery pack according to claim 3, characterized in that, The housing also includes two second side beams, each of which is connected to two first side beams at both ends along the arrangement direction, and at least one second side beam is provided with an exhaust channel; The battery cell also includes two end faces on both sides along a first direction, and at least one end face is provided with a pressure relief mechanism corresponding to the exhaust channel, wherein the first direction is perpendicular to the arrangement direction.

7. The battery pack according to claim 6, characterized in that, The battery cell also includes a top surface that is opposite to the bottom surface along a second direction. The top surface is parallel to the bottom surface. The two ends of the top surface are respectively connected to the two side surfaces. The area of ​​the side surfaces is greater than the area of ​​any one of the bottom surface, the top surface, and the end surface. The second direction, the first direction, and the arrangement direction are perpendicular to each other. Along the arrangement direction, the sides of two adjacent cells abut each other.

8. The battery pack according to claim 7, characterized in that, The length of the battery cell along the first direction is L, the width of the battery cell along the second direction is W, and the thickness of the battery cell along the arrangement direction is D, satisfying that 200mm≤L≤1200mm, 50mm≤W≤150mm, and 15mm≤D≤60mm.

9. The battery pack according to any one of claims 1-8, characterized in that, The bottom surface and the bearing surface are bonded together by an adhesive layer.

10. An electrical device, characterized by Includes the battery pack as described in any one of claims 1-9.

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