Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and the battery pack comprises a box body and at least one battery pack. The box body is provided with a containing cavity. The battery pack is accommodated in the accommodating cavity. The battery pack includes a plurality of battery cells. Each battery monomer comprises a main body and a pole; the main body is provided with a first surface, a second surface, a large surface and a side surface, the first surface and the second surface are oppositely arranged, the large surface is larger than the side surface in area, and the pole is arranged on the first surface. Wherein the plurality of battery monomers of the battery pack comprise a first battery monomer and a second battery monomer which are adjacent to each other, and the second surface of the second battery monomer is opposite to the large surface of the first battery monomer. According to the embodiment of the invention, the distance between the poles of the at least two adjacent battery monomers is increased, so that the influence of thermal runaway on the adjacent battery monomers is reduced.

Description

Technical Field

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

[0002] The battery pack includes a plurality of square batteries. The square battery includes a cubic body and a pole arranged on the body. The body has a large face and a side face, and the area of ​​the large face is larger than the area of ​​the side face. In the battery pack, the plurality of square batteries are arranged in a rectangular array, and the large faces of two adjacent square batteries are arranged facing each other, or the side faces of two adjacent square batteries are arranged facing each other.

[0003] During the use of the battery pack, the pole is the area with the highest temperature in the square battery. In the current arrangement of square batteries, when one square battery has thermal runaway, the temperature of its pole is likely to affect the pole of the adjacent square battery, causing heat to spread to the adjacent square battery. Utility Model Content

[0004] Embodiments of the present application provide a battery pack and an electrical device, which increase the distance between poles of at least two adjacent battery cells, thereby reducing the impact of thermal runaway on adjacent battery cells.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions: In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, a battery pack is provided, the battery pack includes a box body and at least one battery pack. The box body has a receiving cavity; the battery pack is received in the receiving cavity, the battery pack includes a plurality of battery cells, each battery cell includes a main body and a pole, the main body has a first face, a second face, and a large face and a side face connected between the first face and the second face, the area of ​​the large face is larger than the area of ​​the side face, and the pole is arranged on the first face; wherein the plurality of battery cells of the battery pack include adjacent first battery cells and second battery cells, the second face of the second battery cell is arranged opposite to the large face of the first battery cell.

[0007] In addition to or as an alternative to one or more of the features disclosed above, the height dimension of the main body of the battery cell is D1 mm, and the thickness dimension of the main body of the battery cell is D2 mm, satisfying: D1>2D2.

[0008] In addition to one or more of the features disclosed above, or as an alternative, the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers the side of the frame away from the bottom plate, and the top cover, the bottom plate and the frame cooperate to enclose a accommodating cavity; the first face of the first battery cell faces the top cover or the bottom plate, and a large face of the second battery cell is arranged toward the top cover.

[0009] In addition to or instead of one or more of the features disclosed above, the battery pack has a first direction, and the top cover and the bottom plate are distributed along the first direction; the number of second battery cells is at least two, each second battery cell is distributed along the first direction, and the second side of each second battery cell is respectively arranged opposite to the same large side of the first battery cell.

[0010] In addition to one or more of the features disclosed above, or as an alternative, the battery pack has a first direction, a second direction and a third direction that are perpendicular to each other, the top cover and the bottom plate are distributed along the first direction, and the second surface of the second battery cell is arranged opposite to the large surface of the first battery cell along the second direction; the multiple battery cells of the battery pack also include a third battery cell, and the first battery cell and the second battery cell are provided with a third battery cell on at least one side in the third direction.

[0011] In addition to or as an alternative to one or more of the features disclosed above, a large surface of the third battery cell is disposed opposite to a side surface of the first battery cell and a side surface of the second battery cell.

[0012] In addition to or instead of one or more of the features disclosed above, the battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers the side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose a accommodating cavity; the number of battery groups is at least two, each battery group is distributed in a direction perpendicular to the first direction, and the first surface of the first battery cell of each battery group is both arranged toward the top cover or toward the bottom plate.

[0013] In addition to or instead of one or more of the features disclosed above, the battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers the side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose a accommodating cavity; the number of battery groups is at least two, and each battery group is distributed in a direction perpendicular to the first direction; in two adjacent battery groups, the first face of the first battery cell of one of the battery groups is arranged toward the top cover, and the first face of the first battery cell of the other battery group is arranged toward the bottom plate.

[0014] In addition to or instead of one or more of the features disclosed above, the battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers the side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose a accommodating cavity; the number of battery groups is at least two, and each battery group is distributed in a direction perpendicular to the first direction; in two adjacent battery groups, the first surface of the first battery cell of one of the battery groups is arranged toward the top cover or the bottom plate, and the first surface of the first battery cell of the other battery group is arranged obliquely relative to the first direction.

[0015] On the other hand, the present application also provides an electrical device, which includes any of the above-mentioned battery packs.

[0016] One of the above technical solutions has the following advantages or beneficial effects:

[0017] In the prior art, the distance between the poles of two adjacent battery cells is approximately the thickness of the main body in the battery cell. In the present application, in at least two adjacent battery cells, the distance between the poles is greater than the height of the main body in the battery cell. The height is much greater than the thickness, and thus, compared with the prior art, the distance between the poles of at least two adjacent battery cells is increased, thereby reducing the impact of thermal runaway on adjacent battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0019] Figure 1 is a top view of a battery pack in the related art;

[0020] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a battery cell in the battery pack shown;

[0021] Figure 3 yes Figure 1 A top view of a battery cell in the battery pack shown;

[0022] Figure 4 is a top view of an embodiment of a battery pack of the present application;

[0023] Figure 5 yes Figure 4 A top view of a battery pack in the battery pack shown;

[0024] Figure 6 yes Figure 4 A schematic diagram of the three-dimensional structure of a battery pack in the battery pack shown;

[0025] Figure 7 yes Figure 4 A schematic diagram of the three-dimensional structure of two adjacent battery groups in the battery pack shown;

[0026] Figure 8 is a top view of another embodiment of the battery pack of the present application;

[0027] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of two adjacent battery groups in the battery pack shown;

[0028] Fig.10is a top view of another embodiment of the battery pack of the present application;

[0029] Fig.11 yes Fig.10 A schematic diagram of the three-dimensional structure of two adjacent battery groups in the battery pack shown;

[0030] Fig.12 is a top view of another embodiment of the battery pack of the present application;

[0031] Fig.13 yes Fig.12 Schematic diagram of the three-dimensional structure of a battery group in the battery pack shown.

[0032] Explanation of the reference numerals: 300-body; 301-accommodating cavity; 302-top cover; 304-bottom plate; 303-frame; 200-battery pack; 200a-first battery pack; 200b-second battery pack; 100-battery cell; 100a-first battery cell; 100b-second battery cell; 100c-third battery cell; 101-main body; 103-pole; 105-first side; 107-second side; 111-large side; 115-side; 117-explosion-proof valve; Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0035] See also Figures 1 to 3 . Figure 1It is a top view of a battery pack in the related art. Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a battery cell 100 in a battery pack is shown. Figure 3 yes Figure 1 A top view of a battery cell 100 in a battery pack is shown. Figure 1 The middle casing 300 is partially cut away to show the battery cells 100 therein.

[0036] In the related art, a battery pack includes a box body 300 and a plurality of battery cells 100 located in a receiving cavity 301 of the box body 300 .

[0037] Each battery cell 100 is a square battery.

[0038] Each battery cell 100 includes a body 101 and a terminal 103 .

[0039] The main body 101 is generally in the shape of a cube. The main body 101 has a first face 105, a second face 107, two large faces 111 and two side faces 115. The first face 105 and the second face 107 are arranged opposite to each other. The large face 111 and the side face 115 are respectively connected between the first face 105 and the second face 107. The two large faces 111 are arranged opposite to each other and are located on opposite sides of the main body 101. The two side faces 115 are arranged opposite to each other and are located on opposite sides of the main body 101. The angle β between the large face 111 and the side face 115 is 90°. The area of ​​the large face 111 is greater than the area of ​​the side face 115. The main body 101 of the battery cell 100 has a height dimension D1 and a thickness dimension D2, and the height dimension D1 is greater than the thickness dimension D2.

[0040] There are two poles 103 . Each pole 103 is disposed on the first surface 105 . One pole 103 is the positive pole of the battery cell 100 , and the other pole 103 is the negative pole of the battery cell 100 .

[0041] The plurality of battery cells 100 are arranged in a rectangular array in the plane of the second direction X and the third direction Y. Specifically, in the second direction X, the large surfaces 111 of two adjacent battery cells 100 are arranged opposite to each other. In the third direction Y, the side surfaces 115 of two adjacent battery cells 100 are arranged opposite to each other.

[0042] In the related art, the distance between the poles 103 of two adjacent battery cells 100 in the second direction X is relatively small, which is substantially equal to the thickness dimension D2 of the main body 101. When thermal runaway occurs in one of the battery cells 100, the temperature of its pole 103 is likely to affect the pole 103 of the adjacent battery cell 100, thereby causing heat to diffuse to the adjacent battery cell 100.

[0043] In the following embodiments of the present application, by adjusting the placement posture of at least two adjacent battery cells 100 , the distance between the poles 103 of at least two adjacent battery cells 100 is increased, thereby reducing the impact of thermal runaway on the adjacent battery cells 100 .

[0044] See also Figure 4 . Figure 4 It is a top view of an embodiment of a battery pack of the present application. Figure 4 The middle casing 300 is partially cut away to show the battery cells 100 therein.

[0045] The battery pack includes a case 300 and at least one battery group 200 . Figure 4 In the battery pack shown, there are multiple battery groups 200 .

[0046] For the convenience of description, the following definition is made: the battery pack has a first direction Z, a second direction X, and a third direction Y, any two of which are perpendicular to each other.

[0047] The box body 300 includes a top cover 302, a bottom plate 304 and a frame 303. The frame 303 is disposed around the periphery of the bottom plate 304. The top cover 302 covers a side of the frame 303 away from the bottom plate 304 in the first direction Z. The top cover 302, the bottom plate 304 and the frame 303 cooperate to enclose the accommodating cavity 301.

[0048] The battery pack 200 is accommodated in the accommodation chamber 301. Figure 4 In the battery pack shown, multiple battery packs 200 are arranged in a rectangular array in the plane where the second direction X and the third direction Y are located. Specifically, multiple battery packs 200 are arranged in the third direction Y to form a row, and multiple rows of battery packs 200 are arranged in the second direction X.

[0049] Each battery pack 200 includes a plurality of battery cells 100. The specific structure of each battery cell 100 is the same as the structure of the battery cell 100 in the above-mentioned related art, and will not be described in detail here.

[0050] Hereinafter, for the convenience of describing the plurality of battery cells 100 in each battery pack 200 , “first”, “second”, and “third” are used as prefixes for distinction.

[0051] Please also read Figure 5 and Figure 6 . Figure 5 yes Figure 4 6 is a top view of a battery pack 200 in the battery pack shown. Figure 4 A schematic diagram of the three-dimensional structure of a battery group 200 in a battery pack is shown.

[0052] The plurality of battery cells 100 of the battery pack 200 include adjacent first battery cells 100 a and second battery cells 100 b , and the second surface 107 of the second battery cell 100 b is disposed opposite to the large surface 111 of the first battery cell 100 a .

[0053] Among the above-mentioned related technologies, Figure 2 and Figure 3 As shown, the pole 103 is located in the middle area of ​​the first surface 105 in the second direction X. Correspondingly, the distance between the poles 103 of two adjacent battery cells 100 in the second direction X is substantially the thickness dimension D2 mm of the main body 101 .

[0054] In this embodiment, in the first battery cell 100a and the second battery cell 100b, the distance between the poles 103 is greater than the height dimension D1 of the main body 101. Since the height dimension D1 is much greater than the thickness dimension D2, compared with the above-mentioned related art, the embodiment of the present application increases the distance between the poles 103 of at least two adjacent battery cells 100, thereby reducing the impact of thermal runaway on the adjacent battery cells 100.

[0055] In some cases, the battery cell 100 may be a non-standard product. For example, the pole 103 may be located at the edge of the first surface 105 in the second direction X, that is, at the connection between the first surface 105 and the large surface 111. In this case, in the above-mentioned related art, the maximum spacing between the poles 103 of two adjacent battery cells 100 in the second direction X is twice the thickness dimension D2 mm. In order to ensure that the structure in the embodiment of the present application can still increase the spacing between the poles 103 of two adjacent battery cells 100, the following definition is made:

[0056] The height dimension of the main body 101 of the battery cell 100 is D1 mm, and the thickness dimension of the main body 101 of the battery cell 100 is D2 mm, which satisfies: D1>2D2.

[0057] Compared with the situation where the large surfaces 111 of two adjacent battery cells 100 are arranged relative to each other, in the embodiment of the present application, in two adjacent battery cells 100, the second surface 107 of one battery cell 100 is arranged relative to the large surface 111 of the other battery cell 100, which can increase the distance between the poles 103 of the two adjacent battery cells 100.

[0058] In addition, the first surface 105 of the battery cell 100 is provided with an explosion-proof valve 117, and when the battery cell 100 has thermal runaway, the high-temperature gas is ejected through the explosion-proof valve 117. In the above-mentioned related art, when one of the two adjacent battery cells 100 has thermal runaway, the high-temperature gas quickly moves to the pole 103 of the adjacent battery cell 100, thereby causing the temperature of the pole 103 of the adjacent battery cell 100 to rise. In the embodiment of the present application, it is also possible to increase the distance between the explosion-proof valve 117 of one battery cell 100 and the pole 103 of the other battery cell 100 of the two adjacent battery cells 100, thereby reducing the impact of thermal runaway on the adjacent battery cell 100.

[0059] The following introduces Figure 4 The specific structure of the battery group 200 in the battery pack is shown.

[0060] The first surface 105 of the first battery cell 100a faces the top cover 302, and the second surface 107 of the first battery cell 100a faces the bottom cover. In other embodiments, the first surface 105 of the first battery cell 100a may also face the bottom plate 304, and the second surface 107 of the first battery cell 100a may face the top cover 302.

[0061] The number of the second battery cells 100b is at least two, and each second battery cell 100b is distributed along the first direction Z, and the second surface 107 of each second battery cell 100b is respectively arranged opposite to the same large surface 111 of the first battery cell 100a. The two second battery cells 100b are respectively located on the same side of the first battery cell 100a in the second direction X. The side surfaces 115 of the two second battery cells 100b are respectively coplanar with the side surfaces 115 of the first battery cell 100a, so as to reduce the space occupied by the battery pack 200 in the third direction Y.

[0062] Coplanar in this context means that two surfaces are located in the same plane.

[0063] The two large surfaces 111 of the second battery cell 100 b face opposite directions. One large surface 111 of the second battery cell 100 b faces the top cover 302 , and the other large surface 111 of the second battery cell 100 b faces the bottom plate 304 .

[0064] The number of the second battery cells 100b can be set as needed. In the first direction Z, when the second battery cells 100b do not protrude from the first battery cells 100a, more second battery cells 100b can be set to fully utilize the space in the battery pack. In other embodiments, the number of the second battery cells 100b can also be three or more.

[0065] A gap may be provided between the multiple battery cells 100b of the battery pack 200 as required. The gap is used to place cooling or heat insulation materials (such as aerogel, foam, etc.), or the gap is used to form an air cooling channel. Of course, the multiple battery cells 100b of the battery pack 200 may also be directly abutted without providing a gap.

[0066] When there are at least two battery packs 200 , there are a variety of optional postures between two adjacent battery packs 200 , which are described below with examples.

[0067] See also Figure 7 . Figure 7 yes Figure 4 A schematic diagram of the three-dimensional structure of two adjacent battery groups 200 in a battery pack is shown.

[0068] Figure 4 In the battery pack shown, a plurality of battery packs 200 are arranged in a third direction Y to form a row. Figure 7 The two battery packs 200 shown are two adjacent battery packs 200 in a row of battery packs 200 .

[0069] In some embodiments, in two adjacent battery packs 200 , the first surfaces 105 of the first battery cells 100 a of each battery pack 200 are both disposed toward the top cover 302 or toward the bottom plate 304 .

[0070] For the convenience of description, two adjacent battery groups 200 are named as a first battery group 200a and a second battery group 200b, respectively.

[0071] Specifically, the first surface 105 of the first battery cell 100a in the first battery group 200a and the first surface 105 of the first battery cell 100a in the second battery group 200b are respectively facing the top cover 302 and are arranged in the same plane. The second surface 107 of the first battery cell 100a in the first battery group 200a and the second surface 107 of the first battery cell 100a in the second battery group 200b are respectively facing the bottom plate 304 and are arranged in the same plane.

[0072] A large surface 111 of the first battery cell 100a in the first battery pack 200a and a large surface 111 of the first battery cell 100a in the second battery pack 200b face the same direction and are coplanarly arranged. A first surface 105 of the second battery cell 100b in the first battery pack 200a and a first surface 105 of the second battery cell 100b in the second battery pack 200b face the same direction and are coplanarly arranged.

[0073] See also Figure 8 and Fig. 9 . Figure 8 It is a top view of another embodiment of the battery pack of the present application. Fig. 9 yes Figure 8A schematic diagram of the three-dimensional structure of two adjacent battery groups 200 in a battery pack is shown. Figure 8 The battery pack 200 and Figure 4 The battery packs 200 in the illustrated battery packs are identical.

[0074] In some embodiments, in two adjacent battery packs 200 , the first surface 105 of the first battery cell 100 a of one battery pack 200 is disposed toward the top cover 302 , and the first surface 105 of the first battery cell 100 a of the other battery pack 200 is disposed toward the bottom plate 304 .

[0075] Specifically, the end face 1031 of the pole 103 of the first battery cell 100a in the first battery group 200a and the second face 107 of the first battery cell 100a in the second battery group 200b face the same direction and are coplanarly arranged. The end face 1031 of the pole 103 of the second battery cell 100b in the first battery group 200a and a large face 111 of the first battery cell 100a in the second battery group 200b face the same direction and are coplanarly arranged. The end face 1031 of the pole 103 of the second battery cell 100b in the second battery group 200b and a large face 111 of the first battery cell 100a in the first battery group 200a face the same direction and are coplanarly arranged.

[0076] See also Fig.10 and Fig.11 . Fig.10 It is a top view of another embodiment of the battery pack of the present application. Fig.11 yes Fig.10 A schematic diagram of the three-dimensional structure of two adjacent battery groups 200 in a battery pack is shown. Fig.10 The battery pack 200 and Figure 4 The battery packs 200 in the illustrated battery packs are identical.

[0077] In some embodiments, in two adjacent battery packs 200, the first surface 105 of the first battery cell 100a of one battery pack 200 is arranged toward the top cover 302 or the bottom plate 304, and the first surface 105 of the first battery cell 100a of the other battery pack 200 is inclined relative to the first direction Z.

[0078] Specifically, the first surface 105 of the first battery cell 100a in the first battery group 200a is disposed toward the top cover 302. The first surface 105 of the first battery cell 100a in the second battery group 200b is disposed obliquely relative to the first direction Z. One side surface 115 of the first battery cell 100a in the first battery group 200a is disposed opposite to one side surface 115 of the second battery cell 100b in the second battery group 200b. One side surface 115 of the first battery cell 100a in the second battery group 200b is disposed opposite to one side surface 115 of the second battery cell 100b in the first battery group 200a.

[0079] The structure of the battery pack 200 is Figure 6 In addition to the structure shown, other structures are also possible, which are illustrated below with examples.

[0080] See also Fig.12 and Fig.13 . Fig.12 It is a top view of another embodiment of the battery pack of the present application. Fig.13 yes Fig.12 A schematic diagram of the three-dimensional structure of a battery group 200 in a battery pack is shown.

[0081] Fig.13 The battery pack 200 is shown with Figure 6 The battery pack 200 shown is different in that it further includes a third battery cell 100 c .

[0082] Specifically, the plurality of battery cells 100 of the battery pack 200 further include a third battery cell 100c. The third battery cell 100c is disposed on at least one side of the first battery cell 100a and the second battery cell 100b in the third direction Y. Fig.13 In the illustrated battery pack 200 , only one third battery cell 100 c is provided. In other embodiments, the number of the third battery cells 100 c may be two, and the two third battery cells 100 c are respectively provided on two opposite sides of the first battery cell 100 a in the third direction Y.

[0083] Among them, a large surface 111 of the third battery cell 100c is arranged relative to a side surface 115 of the first battery cell 100a and a side surface 115 of the second battery cell 100b. The first surface 105 of the third battery cell 100c is arranged toward the top cover 302, and the second surface 107 of the third battery cell 100c is arranged toward the bottom plate 304. Further, in order to reduce the space occupied by the battery pack 200 in the first direction Z, the first surface 105 of the third battery cell 100c is coplanar with the first surface 105 of the first battery cell 100a, and the second surface 107 of the third battery cell 100c is coplanar with the second surface 107 of the first battery cell 100a.

[0084] The above embodiments of the present application, compared with the above related technologies, increase the spacing between the poles 103 of at least two adjacent battery cells 100, thereby reducing the impact of thermal runaway on the adjacent battery cells 100. In addition, the above embodiments of the present application, compared with the above related technologies, can also slow down the accumulation of extrusion force in the same direction when the battery cell 100 expands and deforms at the large surface 111. The following is a detailed description.

[0085] During the operation of the battery cell 100 or when an abnormality occurs, the large surface 111 usually expands and deforms to a greater extent, which is manifested in that the large surface 111 bulges outwards.

[0086] Please continue to refer to Figure 1 In the related art, multiple battery cells 100 are arranged in a rectangular array, and the large surfaces 111 of two adjacent battery cells 100 are arranged opposite to each other in the second direction X. In the second direction X, the expansion deformation of multiple battery cells 100 will accumulate, causing the box 300 of the battery pack to be subjected to a large extrusion force in the second direction X, so that the box 300 has the risk of failure. At the same time, the extrusion force between two adjacent battery cells 100 may also cause the battery cells 100 to have the risk of failure.

[0087] See also Figure 4 and Figure 5 In each embodiment of the present application, the orientation of the large surface 111 of the second battery cell 100b is perpendicular to the orientation of the large surface 111 of the first battery cell 100a. When the first battery cell 100a and the second battery cell 100b expand and deform at the large surface 111, respectively, the expansion deformation will not accumulate in the same direction. Therefore, compared with the above-mentioned related art, the squeezing force between the battery cells 100 and the squeezing force of the single battery on the box body 300 are reduced.

[0088] The embodiment of the present application also provides an electric device. The electric device is, for example, a car. The electric device includes a battery pack of any of the above embodiments. Since the electric device includes all the technical features of the battery pack, the electric device also includes all the technical effects of the battery pack, which will not be repeated here.

[0089] In summary, the battery pack and electrical equipment embodiments of the present application increase the distance between the poles of at least two adjacent battery cells, thereby reducing the impact of thermal runaway on adjacent battery cells.

[0090] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: include: A box body, wherein the box body has a containing cavity; at least one battery pack, the battery pack being accommodated in the accommodation cavity, the battery pack comprising a plurality of battery cells, each of the battery cells comprising a main body and a pole, the main body comprising a first surface, a second surface, a large surface and a side surface connected between the first surface and the second surface, the area of ​​the large surface being larger than the area of ​​the side surface, and the pole being arranged on the first surface; The plurality of battery cells of the battery pack include adjacent first battery cells and second battery cells, and the second surface of the second battery cell is arranged opposite to the large surface of the first battery cell.

2. The battery pack according to claim 1, characterized in that: The height dimension of the main body of the battery cell is D1 mm, and the thickness dimension of the main body of the battery cell is D2 mm, satisfying: D1>2D2.

3. The battery pack according to claim 1, characterized in that: The box body comprises a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers a side of the frame away from the bottom plate, and the top cover, the bottom plate and the frame cooperate to enclose the accommodating cavity; A first surface of the first battery cell faces the top cover or the bottom plate, and a large surface of the second battery cell faces the top cover.

4. The battery pack according to claim 3, characterized in that: The battery pack has a first direction, and the top cover and the bottom plate are distributed along the first direction; The number of the second battery cells is at least two, the second battery cells are distributed along the first direction, and the second surface of each second battery cell is respectively arranged opposite to the same large surface of the first battery cell.

5. The battery pack according to claim 3, characterized in that: The battery pack has a first direction, a second direction and a third direction which are perpendicular to each other in pairs, the top cover and the bottom plate are distributed along the first direction, and the second surface of the second battery cell is arranged opposite to the large surface of the first battery cell along the second direction; The plurality of battery cells of the battery pack further include a third battery cell, and the third battery cell is disposed on at least one side of the first battery cell and the second battery cell in the third direction.

6. The battery pack according to claim 5, characterized in that: A large surface of the third battery cell is disposed opposite to a side surface of the first battery cell and a side surface of the second battery cell.

7. The battery pack according to claim 1, characterized in that: The battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the periphery of the bottom plate, the top cover covers a side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose the accommodating cavity; The number of the battery groups is at least two, and the battery groups are distributed along a direction perpendicular to the first direction. The first surfaces of the first battery cells of the battery groups are all arranged toward the top cover or toward the bottom plate.

8. The battery pack according to claim 1, characterized in that: The battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the top cover covers a side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose the accommodating cavity; The number of the battery groups is at least two, and each of the battery groups is distributed along a direction perpendicular to the first direction; in two adjacent groups of the battery groups, the first surface of the first battery cell of one of the battery groups is arranged toward the top cover, and the first surface of the first battery cell of the other battery group is arranged toward the bottom plate.

9. The battery pack according to claim 1, characterized in that: The battery pack has a first direction; the box body includes a top cover, a bottom plate and a frame, the frame is arranged around the periphery of the bottom plate, the top cover covers a side of the frame away from the bottom plate in the first direction, and the top cover, the bottom plate and the frame cooperate to enclose the accommodating cavity; The number of the battery groups is at least two, and each of the battery groups is distributed along a direction perpendicular to the first direction; in two adjacent groups of the battery groups, the first surface of the first battery cell of one of the battery groups is arranged toward the top cover or the bottom plate, and the first surface of the first battery cell of the other group of the battery groups is arranged obliquely relative to the first direction.

10. An electrical device, characterized in that: The electrical equipment comprises the battery pack according to any one of claims 1 to 9.

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