Battery pack and powered device

Abstract

The application relates to a battery pack and an electric device, wherein the battery pack comprises at least one battery group, each battery group comprises two rows of battery units distributed in the horizontal direction, each row of battery units comprises at least one battery monomer, each battery monomer comprises a shell and a top cover arranged at the open end of the shell, the surface of the shell opposite to the top cover is an adjacent surface, the battery monomers in the two rows of battery units are one-to-one corresponding and the adjacent surfaces are oppositely arranged, and the largest side surface of the battery monomer is arranged in the horizontal direction; the side surface and the adjacent surface of the battery monomer in one of the two adjacent rows of battery units are both wrapped with an insulating film, and the battery monomer in the corresponding other row of battery units is only wrapped with the insulating film on the side surface. The battery pack in the application can reduce the wrapping thickness of the insulating film between the two battery monomers with the adjacent surfaces oppositely arranged in the two rows of battery units, thereby reducing the occupied space of the insulating film in the arrangement direction of the battery monomers, and further improving the energy density of the whole battery.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to battery packs and electrical equipment. Background Technology

[0002] A battery pack consists of several individual battery cells. As the main energy source for electric devices, its energy storage performance and safety performance are often of concern.

[0003] In related technologies, the prismatic battery cells within a battery pack are typically covered with an insulating film on their surface to insulate and protect them from short circuits with other cells, preventing significant safety hazards during battery pack use. However, when battery cells are arranged in an array to form a battery pack, there are at least two insulating films between adjacent cells. The number of insulating film layers increases with the number of battery cells in the arrangement direction, causing the insulating films to occupy a large amount of space and resulting in a decrease in the overall energy density of the battery pack. Therefore, a technology is urgently needed to solve these problems. Utility Model Content

[0004] Therefore, it is necessary to provide a battery pack and electrical device to address the problem in related technologies where the overall energy density of the battery pack is reduced due to the large space occupied by the insulating film between battery cells in the arrangement direction.

[0005] In a first aspect, this application provides a battery pack, which includes at least one battery group, each battery group including two rows of battery cells distributed in a horizontal direction, each row of battery cells including at least one battery cell, each battery cell including a housing and a top cover disposed at the open end of the housing, the surface of the housing opposite to the top cover being the adjacent surface, the battery cells in the two rows of battery cells corresponding one to one and the adjacent surfaces being disposed opposite to each other, the largest side of the battery cell being disposed in a horizontal direction; the side surface and the adjacent surface of the battery cell in one of the two adjacent rows of battery cells are covered with an insulating film, and the battery cells in the corresponding other row of battery cells are covered with an insulating film only on their side.

[0006] In one embodiment, the two rows of battery cells in the battery pack are a first battery cell and a second battery cell, respectively. The adjacent surfaces of each battery cell in the first battery cell are covered with an insulating film, while the adjacent surfaces of each battery cell in the second battery cell are not covered with an insulating film. Alternatively, the adjacent surfaces of each battery cell in the second battery cell are covered with an insulating film, while the adjacent surfaces of each battery cell in the first battery cell are not covered with an insulating film.

[0007] In one embodiment, the side of the battery cell includes a first side and a second side. The first side and the second side are both connected between the top cover of the housing and the adjacent surface. The area of ​​the second side is larger than the area of ​​the first side. The second side is arranged in a horizontal direction, and the first side is arranged in a vertical direction.

[0008] In one embodiment, for a first target battery cell whose adjacent surfaces are not covered with an insulating film, the insulating film is a first insulating film. The first insulating film is wrapped in a ring around the first side and the second side of the first target battery cell, and the first and last ends of the first insulating film form a first overlapping portion.

[0009] In one embodiment, for the second target battery cell with an insulating film covering adjacent surfaces, the insulating film is a second insulating film that wraps the insulating film body and the insulator film. The insulating film body also wraps around the first and second sides of the second target battery cell in a ring shape, and the first and last ends of the insulating film body form a second overlapping portion. The insulator film is used to cover the adjacent surfaces of the second target battery cell.

[0010] In one embodiment, when the battery pack has only one layer of horizontally distributed battery pack, the first overlapping portion is disposed on the second side where the first target battery cell is located at the top, and the second overlapping portion is disposed on the second side where the second target battery cell is located at the top.

[0011] In one embodiment, when the battery pack has multiple battery packs stacked vertically, the first and second overlapping portions located on the same battery pack and adjacent to each other are non-aligned, dividing two adjacent battery packs in the vertical direction into a group, with one battery pack being the first battery pack and the other being the second battery pack. The first overlapping portion on the first battery pack and the second overlapping portion on the second battery pack are opposite to each other and staggered. The second overlapping portion on the first battery pack and the first overlapping portion on the second battery pack are opposite to each other and staggered.

[0012] In one embodiment, the battery pack further includes a housing, the housing comprising:

[0013] A first outer casing, wherein a first receiving groove is provided on the first outer casing;

[0014] The second outer casing has a second receiving groove. After the second outer casing and the first outer casing are closed, the second receiving groove and the first receiving groove form a holding cavity for holding multiple battery packs.

[0015] In one embodiment, the first housing and the second housing are detachably connected by a fastener.

[0016] Secondly, this application provides an electrical device including any of the battery packs provided in the first aspect.

[0017] The aforementioned battery pack includes at least one battery group, each battery group comprising two rows of battery cells arranged horizontally. Each row of battery cells includes at least one battery cell, and each battery cell includes a housing and a top cover disposed at the open end of the housing. The surfaces of the housing opposite to the top cover are adjacent surfaces. The battery cells in the two rows of battery cells correspond one-to-one and their adjacent surfaces are arranged opposite each other. The largest side of the battery cell is arranged horizontally. The side surface and adjacent surface of the battery cell in one of the adjacent rows of battery cells are covered with an insulating film, while the battery cells in the corresponding other row of battery cells are only covered with an insulating film on their sides. The battery pack in this application achieves insulation protection for the adjacent surfaces of each battery cell in the two rows of battery cells by arranging the adjacent surfaces of two corresponding battery cells in the two rows of battery cells opposite each other and covering the adjacent surface of only one battery cell with an insulating film. This also helps to reduce the thickness of the insulating film between the two battery cells with their adjacent surfaces opposite each other in the two rows of battery cells, thereby reducing the space occupied by the insulating film in the battery cell arrangement direction and thus improving the overall energy density of the battery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery pack structure in some embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the structure of the first insulating film in some embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the second insulating film in some embodiments of this application;

[0022] Figure 4 This is a schematic diagram showing the positional relationship between the first and second overlapping portions when assembling a group of battery packs in some embodiments of this application.

[0023] Figure 5 This is a schematic diagram of the exploded structure of a battery pack in some embodiments of this application.

[0024] Explanation of icon numbers:

[0025] 100, Battery pack; 110, First battery cell; 120, Second battery cell; 130, Top cover; 200, First insulating film; 210, First overlapping portion; 300, Second insulating film; 310, Second overlapping portion; 400, Battery pack; 410, First battery pack; 420, Second battery pack; 430, First outer casing; 432, First receiving groove; 440, Second outer casing; 450, Protruding edge; 452, Assembly hole. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] A battery pack consists of several individual battery cells. As the main energy source for electric devices, its energy storage performance and safety performance are often of concern.

[0033] In related technologies, the prismatic battery cells within a battery pack are typically covered with an insulating film on their surface to insulate and protect them from short circuits with other cells, preventing significant safety hazards during battery pack use. However, when battery cells are arranged in an array to form a battery pack, there are at least two insulating films between adjacent cells. The number of insulating film layers increases with the number of battery cells in the arrangement direction, causing the insulating films to occupy a large amount of space and resulting in a decrease in the overall energy density of the battery pack. Therefore, a technology is urgently needed to solve these problems.

[0034] To address the issue of reduced overall energy density of battery packs due to the large space occupied by the insulating film between individual battery cells in their arrangement direction, firstly, referring to... Figure 1One embodiment of this application provides a battery pack 400, including at least one battery group 100. Each battery group 100 includes two rows of battery cells distributed in a horizontal direction. Each row of battery cells includes at least one battery cell. Each battery cell includes a housing and a top cover 130 disposed at the open end of the housing. The surface of the housing opposite to the top cover 130 is the adjacent surface. The battery cells in the two rows of battery cells correspond one-to-one and the adjacent surfaces are arranged opposite each other. The largest side of the battery cell is arranged in a horizontal direction. The side surface and the adjacent surface of the battery cell in one of the two adjacent rows of battery cells are covered with an insulating film, while the battery cells in the corresponding other row of battery cells are only covered with an insulating film on their side.

[0035] Each battery pack 100 includes two rows of battery cells, namely a first battery cell 110 and a second battery cell 120. The first battery cell 110 and the second battery cell 120 are distributed along a first direction, that is, the battery cells in the first battery cell 110 and the battery cells in the second battery cell 120 are all distributed along the first direction. The battery cells in the first battery cell 110 and the battery cells in the second battery cell 120 are all distributed along a second direction, which is perpendicular to the first direction in the horizontal direction.

[0036] Specifically, the side where the top cover 130 of the battery cell is located is the top surface, and the side opposite the top cover 130 is the bottom surface. The bottom surfaces of the battery cells in the first battery unit 110 and the bottom surfaces of the battery cells in the adjacent second battery unit 120 are arranged opposite each other, that is, adjacent surfaces are arranged opposite each other. Only one adjacent surface of the battery cell in the first battery unit 110 and the battery cell in the adjacent second battery unit 120 needs to be covered with an insulating film, thereby reducing the space occupied by the insulating film in the first direction.

[0037] In this embodiment, the battery pack 400 achieves insulation protection for the adjacent surfaces of two corresponding battery cells in two rows of battery units by arranging the adjacent surfaces of two corresponding battery cells facing each other, and covering the adjacent surface of only one of the battery cells with an insulating film. This also helps to reduce the thickness of the insulating film between the two battery cells with their adjacent surfaces facing each other in the two rows of battery units, thereby reducing the space occupied by the insulating film in the battery cell arrangement direction and thus improving the overall energy density of the battery.

[0038] Reference Figure 1 In some embodiments, the adjacent surfaces of each battery cell in the first battery cell 110 are covered with an insulating film, while the adjacent surfaces of each battery cell in the second battery cell 120 are not covered with an insulating film; or, the adjacent surfaces of each battery cell in the second battery cell 120 are covered with an insulating film, while the adjacent surfaces of each battery cell in the first battery cell 110 are not covered with an insulating film.

[0039] Specifically, the adjacent surfaces of each battery cell in one row of battery units are covered with an insulating film, while the adjacent surfaces of each battery cell in another row of battery units are not covered with an insulating film. This makes it easier for workers to quickly assemble individual battery cells into battery units, and also makes it easier to quickly assemble battery units into battery packs 100.

[0040] Reference Figure 1 In some embodiments, the side of the battery cell includes a first side and a second side. The first side and the second side are both connected between the top cover 130 of the housing and the adjacent surface. The area of ​​the second side is larger than the area of ​​the first side. The second side is arranged in a horizontal direction, and the first side is arranged in a vertical direction.

[0041] Each battery cell is rectangular in shape. Except for the top surface and bottom surface (adjacent surfaces) where the top cover 130 is located, the remaining surfaces are all side surfaces, which include a first side surface and a second side surface with different areas.

[0042] Specifically, by setting the second side horizontally and the first side vertically, a horizontal battery pack is obtained. This arrangement can make full use of the horizontal distribution space so that more battery packs 100 can be distributed in the vertical direction.

[0043] Reference Figure 1 and Figure 2 In some embodiments, for the first target battery cell whose adjacent surfaces are not covered with an insulating film, the insulating film is a first insulating film 200. The first insulating film 200 is wrapped in a ring around the first side and the second side of the first target battery cell, and the first and the last ends of the first insulating film 200 form a first overlapping portion 210.

[0044] Specifically, the insulating films on adjacent battery cells without insulation on adjacent sides are definitely different from those on adjacent battery cells with insulation films. Battery cells without insulation films on adjacent sides are identified as the first target battery cell. That is, only the first and second sides of the first target battery cell are covered with insulating films; the insulating film on the first target battery cell is the first insulating film 200. To improve the efficiency and convenience of the insulating film application, the first insulating film 200 is applied in a ring shape, with a first overlapping portion 210 formed at both ends. The first overlapping portion 210 not only enhances the connection strength between the two ends of the first insulating film 200 but also improves the insulation protection effect on the battery cell.

[0045] Reference Figure 1 and Figure 2 In some embodiments, the structure of the first insulating film 200 is configured as follows: Figure 2As shown, the first insulating film 200 includes a first surface a11, a second surface b1, a third surface a2, a fourth surface b2, and a fifth surface a12 from left to right.

[0046] Among them, the second surface b1 and the fourth surface b2 have the same area and are used to cover the first side of the battery cell with a smaller area. The third surface a2 is used to cover one of the second sides of the battery cell with a larger area. The first surface a11 and the fifth surface a12 are used to cover another second side of the battery cell with a larger area. That is, the first surface a11 is used to cover a part of the other second side of the battery cell with a larger area, and the fifth surface a12 is used to cover another part of the other second side of the battery cell with a larger area. The fifth surface a12 and the first surface a11 intersect and overlap to form the first overlapping part 210.

[0047] For example, when the first insulating film 200 is wrapped around the side of a battery cell, the third surface a2 is first wrapped around the second side of the battery cell at the bottom, then the second surface b1 is wrapped around the first side of the battery cell on the left, then the fourth surface b2 is wrapped around the first side of the battery cell on the right, and finally the first surface a11 and the fifth surface a12 are wrapped around the second side of the battery cell at the top, such that the dotted lines in the first surface a11 and the dotted lines in the fifth surface a12 overlap to form a first overlapping portion 210.

[0048] Reference Figure 1 and Figure 3 In some embodiments, for the second target battery cell with an insulating film covering adjacent surfaces, the insulating film is a second insulating film 300. The second insulating film 300 wraps the insulating film body and the insulator film. The insulating film body also wraps around the first side and the second side of the second target battery cell in a ring shape, and the first and last ends of the insulating film body form a second overlapping portion 310. The insulator film is used to cover the adjacent surfaces of the second target battery cell.

[0049] Specifically, adjacent battery cells covered with insulating film are identified as the second target battery cells. This means that in addition to the first and second sides being covered with insulating film, adjacent surfaces of the second target battery cell are also covered with insulating film; that is, the second target battery cell is covered with the second insulating film 300. To improve the efficiency and convenience of the insulating film covering process, the insulating film body of the second insulating film 300 is wrapped in a ring shape, and the two ends of the insulating film body form a second overlapping portion 310. The second overlapping portion 310 not only enhances the connection strength between the two ends of the insulating film body but also improves the insulation protection effect on the battery cells.

[0050] Reference Figure 1 and Figure 3 In some embodiments, the structure of the second insulating film 300 is configured as follows: Figure 3 As shown, the second insulating film 300 includes, from left to right, a first surface A11, a second surface B1, a third surface A2, a fourth surface B2, and a fifth surface A12, and also includes an insulating film C1.

[0051] Among them, the second surface B1 and the fourth surface B2 have the same area and are used to cover the first side of the battery cell with a smaller area. The third surface A2 is used to cover one of the second sides of the battery cell with a larger area. The first surface A11 and the fifth surface A12 are used to cover another second side of the battery cell with a larger area. That is, the first surface A11 is used to cover a part of the other second side of the battery cell with a larger area, and the fifth surface A12 is used to cover another part of the other second side of the battery cell with a larger area. The fifth surface A12 and the first surface A11 overlap to form a second overlapping part 310.

[0052] For example, when the second insulating film 300 is wrapped around the side of a battery cell, the third side A2 is first wrapped around the second side of the battery cell at the bottom, then the second side B1 is wrapped around the first side of the battery cell on the left, then the fourth side B2 is wrapped around the first side of the battery cell on the right, then the first side A11 and the fifth side A12 are wrapped around the second side of the battery cell at the top, and the dotted lines in the first side A11 and the fifth side A12 overlap to form a second overlapping part 310. Finally, the insulating film C1 is wrapped around the adjacent surface of the battery cell.

[0053] Reference Figure 1 In some embodiments, when the battery pack 400 has only one layer of horizontally distributed battery pack 100, the first overlapping portion 210 is disposed on the second side where the first target battery cell is located at the top, and the second overlapping portion 310 is disposed on the second side where the second target battery cell is located at the top.

[0054] Specifically, when the battery pack 400 has only one layer, the battery group 100 is distributed only in the horizontal direction. The first overlapping part 210 is set on the second side of the first target battery cell located at the top, and the second overlapping part 310 is set on the second side of the second target battery cell located at the top. This not only avoids the space occupied by several overlapping layers on the horizontal plane due to the arrangement of battery cells, thus affecting the overall spatial density, but also makes the second side of the bottom of the battery cell flatter, thereby ensuring the stability of the battery cell when it is placed.

[0055] Reference Figure 4 and Figure 5In some embodiments, when the battery pack 400 has multiple battery packs 100 stacked vertically, the first overlapping portion 210 and the second overlapping portion 310 located on the same battery pack 100 and adjacent to each other are arranged in a non-aligned manner, which divides two battery packs 100 adjacent to each other in the vertical direction into a group, and one of the battery packs 100 is the first battery pack 410 and the other battery pack 100 is the second battery pack 420. The first overlapping portion 210 on the first battery pack 410 and the second overlapping portion 310 on the second battery pack 420 are opposite to each other and staggered. The second overlapping portion 310 on the first battery pack 410 and the first overlapping portion 210 on the second battery pack 420 are opposite to each other and staggered.

[0056] As can be seen from the above, each battery pack 100 has a first overlapping portion 210 and a second overlapping portion 310, and both the first overlapping portion 210 and the second overlapping portion 310 are located at the top. When two battery packs 100 are stacked vertically, if the overlapping portions of the two battery packs 100 are not stacked in a staggered manner, the overlapping portions will occupy more space in the vertical direction. Therefore, in this embodiment, the overlapping portions of the two battery packs 100 located in the same group need to be staggered.

[0057] Specifically, in order to improve the stability of stacking the upper and lower battery packs 100, the first overlapping part 210 and the second overlapping part 310 in each battery pack 100 in each layer can be arranged crosswise, that is, they are not aligned in the horizontal direction.

[0058] For example, such as Figure 4 As shown, assuming that the second battery pack 420 in the initial state is the same as the first battery pack 410, that is, each battery cell in the first battery unit 110 is provided with a first overlapping portion 210, and each battery cell in the second battery unit 120 is provided with a second overlapping portion 310. The second overlapping portion 310 and the first overlapping portion 210 are offset in the horizontal direction. For example, the first overlapping portion 210 in the figure is set to the left relative to the second overlapping portion 310, and the second overlapping portion 310 is set to the right relative to the first overlapping portion 210. When stacking the upper second battery pack 420 on the lower first battery pack 410, the first overlapping portion 210 in the second battery pack 420 and the second overlapping portion 310 in the first battery pack 410 can be arranged opposite to each other and staggered. The second overlapping portion 310 in the second battery pack 420 and the first overlapping portion 210 in the first battery pack 410 can be arranged opposite to each other and staggered. In this way, it can be ensured that the overlapping layer after the first battery pack 410 and the second battery pack 420 are stacked only occupies one layer, thereby reducing the space occupied by the insulating film in the vertical direction and further improving the volumetric energy density of the battery.

[0059] Reference Figure 5In some embodiments, the battery pack 400 further includes a housing, which includes a first housing 430 and a second housing 440. The first housing 430 is provided with a first receiving groove 432; the second housing 440 is provided with a second receiving groove. When the second housing 440 and the first housing 430 are closed, the second receiving groove and the first receiving groove 432 form a holding cavity for holding multiple battery packs 100.

[0060] Specifically, after placing the battery pack 100 in the first receiving slot, the second outer casing 440 is covered, so that the first outer casing 430 and the second outer casing 440 are assembled to form a complete battery pack 400.

[0061] Reference Figure 5 In some embodiments, the first housing 430 and the second housing 440 are detachably connected by a fastener.

[0062] The first outer shell 430 and the second outer shell 440 both have protruding edges 450 extending horizontally outward on their periphery. Multiple mounting holes 452 are provided through the protruding edges 450, and the fasteners include bolts.

[0063] Specifically, after the first outer shell 430 and the second outer shell 440 are closed, the protruding edge 450 on the first outer shell 430 is aligned with the protruding edge 450 on the second outer shell 440. At this time, the mounting hole 452 on the first outer shell 430 is opposite to and connected with the mounting hole 452 on the second outer shell 440. Then, the worker uses bolts and nuts to assemble the first outer shell 430, the second outer shell 440 and the battery pack 100 in the holding cavity into a complete battery pack 400.

[0064] The battery pack 400 in this application achieves insulation protection for the adjacent surfaces of each battery cell in the two rows of battery units by arranging the adjacent surfaces of two corresponding battery cells facing each other, and covering the adjacent surface of only one of the battery cells with an insulating film. At the same time, it also helps to reduce the covering thickness of the insulating film between the two battery cells with their adjacent surfaces facing each other in the two rows of battery units, thereby reducing the space occupied by the insulating film in the battery cell arrangement direction and thus improving the overall energy density of the battery.

[0065] Secondly, one embodiment of this application provides an electrical device including any of the battery packs 400 provided in the first aspect above.

[0066] Specifically, the electrical equipment in this embodiment includes, but is not limited to, electric drive equipment such as electric vehicles and electric buses. When the electrical equipment possesses any of the battery packs 400 described in the first aspect, it also correspondingly achieves insulation protection for the adjacent surfaces of each battery cell in the two rows of battery units, while also helping to reduce the thickness of the insulating film between two battery cells with adjacent surfaces facing each other in the two rows of battery units. This reduces the space occupied by the insulating film in the battery cell arrangement direction, thereby improving the overall energy density of the battery.

[0067] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack, characterized by, The battery pack includes at least one battery group, and each battery group includes two rows of battery cells distributed horizontally. Each row of battery cells includes at least one battery cell. Each battery cell includes a housing and a top cover disposed at the open end of the housing. The surface of the housing opposite to the top cover is the adjacent surface. The battery cells in the two rows of battery cells correspond one-to-one and the adjacent surfaces are arranged opposite each other. The largest side of the battery cell is arranged horizontally. The side surface and the adjacent surface of the battery cell in one of the two adjacent rows of battery cells are covered with an insulating film, while the battery cells in the corresponding other row of battery cells are only covered with an insulating film on their side.

2. The battery pack of claim 1, wherein, The two rows of battery cells in the battery pack are a first battery cell and a second battery cell. The adjacent surfaces of each battery cell in the first battery cell are covered with an insulating film, while the adjacent surfaces of each battery cell in the second battery cell are not covered with an insulating film. Alternatively, the adjacent surfaces of each battery cell in the second battery cell are covered with an insulating film, while the adjacent surfaces of each battery cell in the first battery cell are not covered with an insulating film.

3. The battery pack of claim 1, wherein, The battery cell has a first side and a second side. The first side and the second side are both connected between the top cover of the housing and the adjacent surface. The area of ​​the second side is larger than the area of ​​the first side. The second side is arranged in a horizontal direction and the first side is arranged in a vertical direction.

4. The battery pack according to claim 1, characterized in that, For the first target battery cell whose adjacent surfaces are not covered by the insulating film, the insulating film is a first insulating film. The first insulating film is wrapped in a ring around the first side and the second side of the first target battery cell, and the first and last ends of the first insulating film form a first overlapping portion.

5. The battery pack according to claim 4, characterized in that, For the adjacent second target battery cell covered by the insulating film, the insulating film is a second insulating film that wraps the insulating film body and the insulator film. The insulating film body also wraps around the first and second sides of the second target battery cell in a ring shape, and the first and last ends of the insulating film body form a second overlapping part. The insulator film is used to cover the adjacent surfaces of the second target battery cell.

6. The battery pack according to claim 5, characterized in that, When the battery pack has only one layer of horizontally distributed battery pack, the first overlapping portion is disposed on the second side of the first target battery cell located at the top, and the second overlapping portion is disposed on the second side of the second target battery cell located at the top.

7. The battery pack according to claim 6, characterized in that, When the battery pack has multiple layers of battery packs stacked vertically, the first overlapping portion and the second overlapping portion located on the same battery pack and adjacent to each other are arranged in a non-aligned manner, which divides two adjacent battery packs in the vertical direction into a group, and one of the battery packs is the first battery pack and the other battery pack is the second battery pack. The first overlapping portion on the first battery pack and the second overlapping portion on the second battery pack are opposite to each other and staggered. The second overlapping portion on the first battery pack and the first overlapping portion on the second battery pack are opposite to each other and staggered.

8. The battery pack according to claim 1, characterized in that, It also includes a housing, the housing comprising: A first outer casing, wherein the first outer casing is provided with a first receiving groove; The second outer casing has a second receiving groove. When the second outer casing and the first outer casing are closed, the second receiving groove and the first receiving groove form a holding cavity for holding multiple battery packs.

9. The battery pack according to claim 8, characterized in that, The first housing and the second housing are detachably connected by fasteners.

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-9.

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