Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and electric equipment, the battery pack comprises a box body, a battery pack and a first end plate arranged at one end of the battery pack along a first direction, and the first end plate abuts against a frame; a groove is formed in one side, close to the frame, of the first end plate; the height of the frame along a third direction is defined as n, and the third direction is perpendicular to the bottom surface of the box body; the height of the first end plate in the third direction is defined as h, a is defined as n / h, and a is larger than or equal to 1 and smaller than or equal to 3; the overall thickness of the first end plate in the first direction is defined as b, and a / b is larger than or equal to 0.083 mm <-1 > and smaller than or equal to 0.5 mm <-1 >. According to the battery pack provided by the utility model, the first end plate has a certain thickness along the first direction, so that the structural strength of the first end plate is effectively guaranteed; meanwhile, the situation that the overall thickness of the first end plate in the first direction is too large, and the energy density of the whole package is low is avoided.

Description

Technical Field

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

[0002] In the related art, in order to facilitate the assembly of the battery pack, the battery cells are usually stacked and clamped into a box as a whole after being grouped externally. End plates are usually provided at both ends of the battery cell stacking direction, and the end plates are provided with grooves for the clamping claws of the clamping mechanism to extend into.

[0003] When the end plate abuts against the inner beam of the box, since the end plate is higher than the inner beam, sufficient operating space is reserved for the clamping mechanism's claws, and the battery pack is easier to put into the box. However, when the end plate abuts against the box frame, since the box frame height is greater than the end plate height, the operating space of the clamping mechanism becomes smaller, and the clamping mechanism's claws are not easy to extend into the groove, making it difficult for the battery pack to be put into the box. Utility Model Content

[0004] In view of this, the utility model provides a battery pack and an electrical device to solve the problem that when the end plate abuts against the frame of the box, the operating space of the clamping claw becomes smaller, resulting in difficulty in putting the battery pack into the box.

[0005] In a first aspect, the utility model provides a battery pack, comprising:

[0006] The box body is enclosed by a plurality of frames, and a storage space is formed inside the box body;

[0007] A battery pack is disposed in the accommodation space, wherein the battery pack is formed by stacking a plurality of battery cells along a first direction;

[0008] A first end plate is disposed at one end of the battery pack along the first direction, the first end plate abutting against the frame; a groove is provided on one side of the first end plate close to the frame, the groove being formed by an end surface of the first end plate close to the frame being concave toward one side of the battery pack;

[0009] The height of the frame along the third direction is defined as n, and the third direction is perpendicular to the bottom surface of the box body; the height of the first end plate along the third direction is defined as h1, and a=n / h1 is defined, satisfying: 1≤a≤3;

[0010] The overall thickness of the first end plate along the first direction is defined as b, satisfying:

[0011] 0.083mm -1 ≤a / b≤0.5mm -1 .

[0012] Beneficial effect: By limiting the lower limit of the ratio between the height n of the frame along the third direction and the height h1 of the first end plate along the third direction, that is, a=n / h1≥1, it is ensured that the height of the frame along the third direction is not lower than the height of the first end plate along the third direction. And by limiting the upper limit of the ratio between the height n of the frame along the third direction and the height h1 of the first end plate along the third direction, that is, a=n / h1≤3, it is prevented that the height of the first end plate along the third direction is too small, resulting in insufficient contact area between the first end plate and the battery pack, and the battery pack is prevented from being subjected to excessive pressure during the clamping process, and the battery pack is prevented from being damaged. By limiting the upper limit of the ratio between a and the overall thickness b of the first end plate along the first direction, it is possible to avoid the overall thickness of the first end plate along the first direction being too small, and to prevent the situation where the clamping claw of the clamping mechanism cannot extend into the groove, thereby reserving sufficient clamping space for the clamping claw of the clamping mechanism, and making the first end plate have a certain thickness along the first direction, which can effectively ensure the structural strength of the first end plate. Furthermore, by defining a lower limit of the ratio between a and the overall thickness b of the first end plate along the first direction, it is possible to avoid the overall thickness of the first end plate along the first direction being too large, thereby avoiding a situation in which the energy density of the entire package is low.

[0013] In a second aspect, the utility model further provides an electrical device, including: a battery pack as described above.

[0014] Since the electrical equipment includes a battery pack and has the same effect as the battery pack, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 A top view of the battery pack of the utility model;

[0017] Figure 2 for Figure 1 A partial enlarged view of

[0018] Figure 3 It is a cross-sectional schematic diagram of the battery pack of the utility model;

[0019] Figure 4 for Figure 3 Partial magnification Figure 1 ;

[0020] Figure 5 for Figure 3 Partial magnification Figure 2 ;

[0021] Figure 6 This is a schematic diagram of the cooperation between the first end plate and the battery cell of the utility model;

[0022] Figure 7 This is a schematic structural diagram of another first end plate of the utility model.

[0023] Description of reference numerals:

[0024] 1. Box body; 11. Frame; 12. Internal beam;

[0025] 2. Battery pack; 21. Battery cell;

[0026] 3. first end plate; 31. groove; 32. abutting portion; 33. partition portion; 34. overflow groove; 35. chamfered portion;

[0027] 4. Second end plate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] 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.

[0030] 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 indirectly connected 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.

[0031] 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.

[0032] In order to facilitate the placement of the battery pack into the box, end plates are usually provided at both ends along the stacking direction of the battery cells, and the end plates are provided with grooves for the clamping claws of the clamping mechanism to extend into. The clamping mechanism can conveniently clamp the stacked battery pack into the box as a whole.

[0033] In the related art, the end plates are often in contact with the internal beams of the box body. Since the end plates are higher than the internal beams, sufficient operating space is reserved for the clamping mechanism's claws, and the battery pack is easier to put into the box. If internal beams are provided at both ends of the battery pack just to reserve sufficient clamping space for the end plates at both ends of the battery pack, it is easy to cause the internal beam on one side to occupy unnecessary space in the pack, resulting in a low energy density of the battery pack.

[0034] This embodiment can greatly improve the energy density of the battery pack by eliminating the internal beam on one side so that the end plate of one end of the battery pack directly contacts the frame of the box. However, when the end plate contacts the frame of the box, the operating space of the clamping claw becomes smaller because the height of the box frame is greater than the height of the end plate. At this time, the clamping claw of the clamping mechanism is not easy to extend into the groove, making it difficult to put the battery pack into the box.

[0035] The battery pack provided by the embodiment of the utility model reasonably limits the parameters of the end plate, thereby ensuring the structural strength of the end plate while reserving sufficient operating space for the clamping claws of the clamping mechanism, so as to facilitate the clamping claws to extend into the groove and facilitate the overall clamping of the stacked battery pack into the box; that is, the energy density of the whole pack is improved, and the convenience of assembly when clamping into the box is ensured.

[0036] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0037] According to an embodiment of the present utility model, on the one hand, a battery pack is provided, comprising:

[0038] The box body 1 is surrounded by a plurality of frames 11, and a storage space is formed inside the box body 1;

[0039] A battery pack 2 is disposed in the accommodation space, and the battery pack 2 is formed by stacking a plurality of battery cells 21 along a first direction;

[0040] A first end plate 3 is disposed at one end of the battery pack 2 along the first direction, and the first end plate 3 is in contact with the frame 11; a groove 31 is formed on one side of the first end plate 3 close to the frame 11, and the groove 31 is formed by an end surface of the first end plate 3 close to the frame 11 and concave toward one side of the battery pack 2;

[0041] The height of the frame 11 along the third direction is defined as n, and the third direction is perpendicular to the bottom surface of the box body 1; the height of the first end plate 3 along the third direction is defined as h1, and a=n / h1 is defined, satisfying: 1≤a≤3;

[0042] The overall thickness of the first end plate 3 along the first direction is defined as b, satisfying:

[0043] 0.083mm -1 ≤a / b≤0.5mm -1 .

[0044] The battery pack 2 is formed by stacking a plurality of battery cells 21 along a first direction, that is, the stacking direction of the plurality of battery cells 21 is parallel to the first direction. In this embodiment, the first direction may be the length direction of the battery pack.

[0045] The third direction is perpendicular to the bottom surface of the box body 1; in this embodiment, the third direction may be the height direction of the battery pack.

[0046] The first end plate 3 is disposed at one end of the battery pack 2 along the first direction, and the first end plate 3 is in contact with the frame 11. In this embodiment, both ends of the battery pack 2 along the first direction are provided with end plates, and the structures of the end plates at both ends can be the same or different, and the second end plate 4 is disposed at one end of the battery pack 2 along the first direction away from the first end plate 3. By respectively disposing the first end plate 3 and the second end plate 4 at both ends of the battery pack 2 along the first direction, the battery pack 2 can be conveniently clamped so as to be clamped into the warehouse.

[0047] A groove 31 is provided on one side of the first end plate 3 close to the frame 11, and the groove 31 is formed by the end surface of the first end plate 3 close to the frame 11 being recessed toward the side of the battery pack 2; the groove 31 is used to facilitate the extension of the clamping claws of the clamping mechanism, so that after the clamping mechanism clamps the battery pack 2 along the first direction, the stacked battery pack 2 can be clamped into the box as a whole.

[0048] By limiting the lower limit of the ratio between the height n of the frame 11 along the third direction and the height h1 of the first end plate 3 along the third direction, that is, a=n / h1≥1, it is ensured that the height of the frame 11 along the third direction is not lower than the height of the first end plate 3 along the third direction. And by limiting the upper limit of the ratio between the height n of the frame 11 along the third direction and the height h1 of the first end plate 3 along the third direction, that is, a=n / h1≤3, it is prevented that the height of the first end plate 3 along the third direction is too small, resulting in insufficient contact area between the first end plate 3 and the battery pack 2, avoiding excessive pressure on the battery pack 2 during the clamping process, and preventing the battery pack 2 from being damaged.

[0049] It should be noted that, in this embodiment, the overall thickness of the first end plate 3 along the first direction refers to the distance between the end surfaces on both sides in the first direction, starting from the end surface of the first end plate 3 that is in contact with the battery pack 2 and ending at the end surface of the first end plate 3 that is in contact with the frame 11. Optionally, to ensure that the force on the first end plate 3 is balanced, the end surfaces on both sides of the first end plate 3 are arranged parallel to each other.

[0050] Furthermore, by defining the upper limit of the ratio between a and the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the overall thickness of the first end plate 3 along the first direction being too small, and to prevent the clamping claws of the clamping mechanism from being unable to extend into the groove 31, thereby reserving sufficient clamping space for the clamping claws of the clamping mechanism, and making the first end plate 3 have a certain thickness along the first direction, which can effectively ensure the structural strength of the first end plate 3. In addition, by defining the lower limit of the ratio between a and the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the overall thickness of the first end plate 3 along the first direction being too large, and to avoid the situation where the energy density of the whole package is low.

[0051] In some embodiments, in combination Figure 5 As shown, the value range of the overall thickness b of the first end plate 3 along the first direction is 6 mm ≤ b ≤ 12 mm;

[0052] The maximum groove depth of the groove 31 along the first direction is defined as c, which satisfies: 4.5 mm ≤ c ≤ 9 mm.

[0053] As an optional implementation form, the overall thickness b of the first end plate 3 along the first direction can be 6 mm, 6.5 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 11.5 mm, 12 mm, etc.

[0054] As an optional implementation form, the maximum groove depth c of the groove 31 along the first direction can be 4.5 mm or 5 mm or 5 mm or 6 mm or 6.5 mm or 7 mm or 8 mm or 8.5 mm or 9 mm, etc.

[0055] By limiting the lower limit of the overall thickness b of the first end plate 3 along the first direction, it is possible to prevent the overall thickness of the first end plate 3 along the first direction from being too small, so that the first end plate 3 has a certain thickness along the first direction, which can effectively ensure the structural strength of the first end plate 3. At the same time, by limiting the lower limit of the maximum groove depth c of the groove 31 along the first direction, it is possible to prevent the maximum groove depth c from being too small, and avoid the situation where the clamping claw of the clamping mechanism cannot extend into the groove 31, thereby reserving sufficient clamping space for the clamping claw of the clamping mechanism. In addition, by limiting the upper limit of the overall thickness b of the first end plate 3 along the first direction, it is possible to prevent the overall thickness of the first end plate 3 along the first direction from being too large, and avoid the situation where the energy density of the whole package is low.

[0056] In some embodiments, in combination Figure 3 , Figure 5 As shown, the length of the battery pack 2 along the first direction is defined as p, satisfying: 81≤p / b≤163.

[0057] It should be noted that the length of the battery pack 2 along the first direction specifically refers to the distance between the faces of the battery cells 21 at both ends of the battery pack 2 that are away from each other along the first direction. That is, along the first direction, the distance between the end face where the battery pack 2 and the first end plate 3 are attached and the end face where the battery pack 2 and the second end plate 4 are attached.

[0058] Since the end plate has to bear a large clamping force when the clamping claw clamps the battery pack 2 and over-presses it into the box, by limiting the upper limit of the ratio of the length p of the battery pack 2 along the first direction to the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the situation where the battery pack is too long but the end plate is too thin, ensure the structural strength of the first end plate 3, avoid the collapse of the end plate, and prevent assembly difficulties. At the same time, by limiting the lower limit of the ratio of the length p of the battery pack 2 along the first direction to the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the situation where the battery pack is short and the end plate is thick, and while ensuring the structural strength of the first end plate 3, it is possible to avoid the first end plate 3 being too thick and occupying too much space in the package, and ensure the volume energy density of the entire package.

[0059] In some embodiments, in combination Figure 3 , Figure 4 As shown, the battery pack also includes:

[0060] The internal beam 12 is disposed in the box body 1, and one end of the battery pack 2 away from the frame 11 is directly or indirectly in contact with the internal beam 12;

[0061] A second end plate 4 is disposed between the battery pack 2 and the internal beam 12;

[0062] Define the height of the second end plate 4 along the third direction as h2;

[0063] The height of the inner beam 12 along the third direction is defined as m, satisfying: m<n;

[0064] The overall thickness of the second end plate 4 along the first direction is defined as d, satisfying: 5≤h2 / d≤34.

[0065] In this embodiment, both ends of the battery pack 2 along the first direction are provided with end plates, and the structures of the end plates at both ends can be the same or different. Since the end plates at both ends are subjected to the same clamping force when entering the box, it is necessary to ensure that the strength of the end plates at both ends is balanced as much as possible.

[0066] By respectively arranging the first end plate 3 and the second end plate 4 at the two ends of the battery pack 2 along the first direction, the battery pack 2 can be conveniently clamped so as to be clamped into the compartment.

[0067] It should be noted that, in this embodiment, the overall thickness of the second end plate 4 along the first direction refers to the distance between the end surfaces on both sides in the first direction, starting from the end surface of the second end plate 4 that is in contact with the battery pack 2 and ending at the end surface of the second end plate 4 that is in contact with the internal beam 12. Optionally, to ensure that the force on the second end plate 4 is balanced, the end surfaces on both sides of the second end plate 4 are arranged parallel to each other.

[0068] In this embodiment, the height of the second end plate 4 along the third direction is equal to the height of the first end plate 3 along the third direction.

[0069] In some embodiments, the overall thickness d of the second end plate 4 along the first direction is equal to the overall thickness b of the first end plate 3 along the first direction;

[0070] Alternatively, the overall thickness d of the second end plate 4 along the first direction is smaller than the overall thickness b of the first end plate 3 along the first direction.

[0071] Since the first end plate 3 abuts between the battery pack 2 and the frame 11, the second end plate 4 abuts between the battery pack 2 and the internal beam 12, and the height m of the internal beam 12 along the third direction is less than the height n of the frame 11 along the third direction, it is easier for the second end plate 4 to reserve sufficient clamping space for the clamping claws of the clamping mechanism. On this basis, the maximum groove depth of the groove of the second end plate 4 along the first direction can be less than the maximum groove depth of the groove 31 of the first end plate 3 along the first direction; and then, while having the same structural strength, the overall thickness d of the second end plate 4 along the first direction can be less than the overall thickness b of the first end plate 3 along the first direction. This reserves more layout space for the battery pack and maximizes the energy density of the entire package.

[0072] The internal beam 12 is arranged in the box body 1. The internal beam 12 can play a structural reinforcement role for the box body 1. At the same time, it can conveniently separate the box body 1 into a battery compartment and an electrical compartment, so as to arrange the battery pack and electrical components separately, reasonably plan the space layout in the box body 1, and improve the space utilization rate in the box body 1.

[0073] In this embodiment, the internal beam 12 extends along the second direction, wherein the second direction in this embodiment may be the width direction of the battery pack.

[0074] In some embodiments, in combination Figure 6 As shown, a chamfered portion 35 is formed on one side of the first end plate 3 close to the frame 11 and located on the top of the first end plate 3 along the third direction;

[0075] And / or, a chamfered portion 35 is formed on one side of the second end plate 4 close to the inner beam 12 and at the top of the second end plate 4 along the third direction.

[0076] The chamfered portion 35 can play a guiding role, making it easier for the clamping claws of the clamping mechanism to extend into the groove.

[0077] In some embodiments, in combination Figure 5 As shown, the height of the battery cell 21 along the third direction is defined as r, which satisfies: 0.7≤h1 / r≤1.2.

[0078] It should be noted that since the end plate only abuts against the large battery surface of the battery cell 21, and does not abut against the pole of the battery cell 21, the height r of the battery cell 21 along the third direction here specifically refers to the shoulder height of the battery cell 21, that is, the distance from the bottom surface of the battery cell 21 along the third direction to the top surface of the shell of the battery cell 21, and does not include the height of the pole of the battery cell 21 along the third direction.

[0079] By limiting the lower limit of the ratio of the height h1 of the first end plate 3 along the third direction to the height r of the battery cell 21 along the third direction, it is possible to ensure that the preload force of the end plate on the first battery acts evenly on the entire large surface of the battery cell 21, avoiding the situation where the contact area between the first end plate 3 and the battery cell 21 is too small, resulting in excessive local pressure on the battery cell 21. By limiting the upper limit of the ratio of the height h1 of the first end plate 3 along the third direction to the height r of the battery cell 21 along the third direction, it is possible to ensure uniform preload force while avoiding material waste caused by excessive height of the first end plate 3.

[0080] Additionally, the height of the second end plate 4 along the third direction is equal to the height h1 of the first end plate 3 along the third direction. Therefore, the ratio range of 0.7≤h1 / r≤1.2 is also applicable to the second end plate 4 and will not be elaborated herein.

[0081] In some embodiments, the following conditions are met:

[0082] 5≤h1 / b≤34.

[0083] By reasonably limiting the lower limit of the ratio of the height h1 of the first end plate 3 along the third direction to the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the situation where the energy density of the whole package is low due to the first end plate 3 being too thick; at the same time, it is possible to avoid the situation where the abutment area between the first end plate 3 and the battery pack 2 is insufficient due to the insufficient height of the first end plate 3, and to avoid excessive pressure on the battery pack 2 during the clamping process, thereby preventing the battery pack 2 from being damaged. By reasonably limiting the upper limit of the ratio of the height h1 of the first end plate 3 along the third direction to the overall thickness b of the first end plate 3 along the first direction, it is possible to avoid the situation where the structural strength is insufficient due to the thin thickness of the first end plate 3; at the same time, it is possible to avoid the waste of materials due to the excessive height of the first end plate 3.

[0084] Additionally, the height of the second end plate 4 along the third direction is equal to the height h1 of the first end plate 3 along the third direction. Therefore, the ratio range of 5≤h1 / b≤34 is also applicable to the second end plate 4 and will not be elaborated herein.

[0085] In some embodiments, in combination Figure 7 As shown, the first end plate 3 also includes:

[0086] At least two abutting portions 32, the abutting portions 32 abut against the frame 11 along the first direction; two adjacent abutting portions 32 are spaced apart along the second direction, and a groove 31 is formed between the two adjacent abutting portions 32; wherein the second direction is perpendicular to both the first direction and the third direction;

[0087] A partition 33 is connected to two adjacent abutting portions 32, and a groove 31 is formed at the upper portion of the partition 33 along the third direction, and a glue overflow groove 34 is formed at the lower portion of the partition 33 along the third direction;

[0088] The depth of the overflow groove 34 along the first direction is smaller than the depth of the groove 31 along the first direction.

[0089] By arranging the glue overflow groove 34 below the lower first end plate 3, the glue application amount can be reduced, the weight of the whole package can be reduced, and the cost can be reduced.

[0090] Additionally, the second end plate 4 may have the same structural form as the first end plate 3 and may also be provided with a glue overflow groove. The description of the second end plate 4 being provided with the glue overflow groove will not be repeated here.

[0091] According to an embodiment of the present invention, on the other hand, an electric device is provided, including: a battery pack as described above.

[0092] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A battery pack, characterized in that: include: A box body (1) is enclosed by a plurality of frames (11), and a storage space is formed inside the box body (1); A battery pack (2) is arranged in the accommodation space, and the battery pack (2) is formed by stacking a plurality of battery cells (21) along a first direction; A first end plate (3) is arranged at one end of the battery pack (2) along the first direction, the first end plate (3) being in contact with the frame (11); a groove (31) is provided on a side of the first end plate (3) close to the frame (11), the groove (31) being formed by an end surface of the first end plate (3) close to the frame (11) being recessed toward a side of the battery pack (2); The height of the frame (11) along the third direction is defined as n, and the third direction is perpendicular to the bottom surface of the box body (1); the height of the first end plate (3) along the third direction is defined as h1, and a=n / h1 is defined, satisfying: 1≤a≤3; The overall thickness of the first end plate (3) along the first direction is defined as b, satisfying: 0.083mm -1 ≤a / b≤0.5mm -1 。 2. The battery pack according to claim 1, characterized in that: The overall thickness b of the first end plate (3) along the first direction has a value range of 6 mm ≤ b ≤ 12 mm; The maximum groove depth of the groove (31) along the first direction is defined as c, which satisfies: 4.5 mm ≤ c ≤ 9 mm.

3. The battery pack according to claim 1, characterized in that: The length of the battery pack (2) along the first direction is defined as p, satisfying: 81≤p / b≤163.

4. The battery pack according to claim 1, characterized in that: The battery pack further comprises: An internal beam (12) is arranged in the box body (1), and one end of the battery pack (2) away from the frame (11) is in direct or indirect contact with the internal beam (12); A second end plate (4) is disposed between the battery pack (2) and the internal beam (12); defining a height of the second end plate (4) along the third direction as h2; The height of the inner beam (12) along the third direction is defined as m, satisfying: m<n; The overall thickness of the second end plate (4) along the first direction is defined as d, satisfying: 5≤h2 / d≤34.

5. The battery pack according to claim 4, characterized in that: The overall thickness d of the second end plate (4) along the first direction is equal to the overall thickness b of the first end plate (3) along the first direction; Alternatively, the overall thickness d of the second end plate (4) along the first direction is smaller than the overall thickness b of the first end plate (3) along the first direction.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The height of the battery cell (21) along the third direction is defined as r, which satisfies: 0.7≤h1 / r≤1.

2.

7. The battery pack according to any one of claims 1 to 5, characterized in that: satisfy: 5≤h1 / b≤34.

8. The battery pack according to any one of claims 1 to 5, characterized in that: The first end plate (3) further comprises: at least two abutting portions (32), wherein the abutting portions (32) abut against the frame (11) along a first direction; two adjacent abutting portions (32) are arranged at intervals along a second direction, and the groove (31) is formed between the two adjacent abutting portions (32); wherein the second direction is perpendicular to both the first direction and the third direction; A partition (33) connected to two adjacent abutting portions (32), wherein the partition (33) forms the groove (31) at the top along the third direction, and forms a glue overflow groove (34) at the bottom along the third direction; The depth of the glue overflow groove (34) along the first direction is less than the depth of the groove (31) along the first direction.

9. The battery pack according to claim 4, characterized in that: A chamfered portion (35) is formed on one side of the first end plate (3) close to the frame (11) and located at the top of the first end plate (3) along the third direction; And / or, a chamfered portion (35) is formed on one side of the second end plate (4) close to the internal beam (12) and located at the top of the second end plate (4) along the third direction.

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

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