Battery pack and powered device

Abstract

The application provides a battery pack and an electric device, the battery pack comprising at least a box body, a partition beam, at least two battery groups and at least two partition plates, the box body is internally provided with a containing cavity, the partition beam is arranged along a first direction to divide at least two battery compartments distributed along the first direction in the containing cavity; each battery group is correspondingly arranged in each battery compartment, and the battery group comprises at least a plurality of battery monomers arranged in an array along the first direction and along a second direction; at least one partition plate is located between two columns of battery monomers arranged along the first direction and is fixedly connected with a first side surface, an insulating member is arranged on the first side surface fixedly connected with the partition plate, a first windowing area is arranged on the insulating member of the first side surface, and the shell of the battery monomer at the position of the first windowing area is exposed; at least a part of the exposed shell of the first windowing area is adhesively fixed to the partition plate.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery pack and an electrical device. Background Technology

[0002] In existing battery packs, partition beams and crossbeams are typically included to provide structural strength in two directions. However, to save space, battery packs with only partition beams have emerged. Because these battery packs only have partition beams, their internal structural strength is weakened.

[0003] Therefore, this type of battery pack needs to be improved to enhance its internal structural strength. To improve the internal structural strength of the battery pack, some battery packs are equipped with partition plates. These partition plates are fixedly installed between the individual battery cells, extending perpendicularly to the partition beams, thus providing structural strength in two directions together with the partition beams.

[0004] However, in order to ensure insulation performance, the surface of the battery cells in the battery pack is provided with insulating components. These insulating components can affect the connection strength between the separator and the battery cells. Under long-term operation, the separator is prone to separation from the battery cells, affecting the structural stability of the battery pack. Utility Model Content

[0005] In view of this, the present application aims to provide a battery pack and electrical device to solve the technical problem that the surface of the battery cells in the existing battery pack is provided with insulating parts, which affects the connection strength between the separator and the battery cells. Under long-term operation, the separator is prone to separation from the battery cells, affecting the structural stability of the battery pack.

[0006] The first aspect of this application provides a battery pack, comprising:

[0007] The box includes a base plate and a frame fixed to the outer periphery of the base plate, the base plate and the frame forming a receiving cavity;

[0008] A partition beam is configured to extend along a first direction of the battery pack and be fixedly connected to the frame and / or base plate to divide the receiving cavity into at least two battery compartments distributed along the first direction.

[0009] At least two battery packs are provided, each battery pack being disposed in a corresponding battery compartment. Each battery pack includes at least a plurality of battery cells arranged in an array along a first direction and a second direction. The first direction and the second direction are parallel to the large surface of the base plate. Each battery cell has a first side perpendicular to the first direction.

[0010] At least two partition plates, at least one of the partition plates is located between two rows of battery cells arranged along a first direction, and both sides of the partition plate are fixedly connected to the first side of at least two battery cells arranged along a second direction;

[0011] The battery cell has an insulating component on its first side that is fixedly connected to the separator. The insulating component on the first side has a first window area, and the casing of the battery cell is exposed at the location of the first window area. At least a portion of the casing exposed in the first window area is bonded and fixed to the separator.

[0012] Another aspect of this application provides an electrical device including at least one battery pack.

[0013] In the battery pack of this application embodiment, since at least some of the battery cells have a first window area on the insulating part of the first side, the shell of the battery cell at the first window area is exposed. At least a portion of the partition plate is bonded and fixed to the first window area of ​​the first side of the battery cell, that is, at least a portion of the partition plate is directly bonded and fixed to the shell of the battery cell at the first window area, and the remaining portion can be bonded and fixed to the insulating part of the battery cell. The above structure can ensure a stable connection between the partition plate and the battery cell, and avoid the partition plate tearing the insulating part when the battery cell vibrates. This makes the internal structure of the battery pack with only partition beams more stable, and there is no need to set up separate cross and longitudinal beams to reinforce the box to constrain and fix the battery, thereby improving the energy density of the battery in the battery pack. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0015] Figure 2 This is another structural schematic diagram of the battery pack according to an embodiment of this application;

[0016] Figure 3 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the structure of the partition plate in an embodiment of this application;

[0019] Figure 6 This is a schematic diagram of the structure of another battery cell according to an embodiment of this application.

[0020] Attached image labels:

[0021] X: First direction; Y: Second direction; Z: Altitude direction. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0025] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0026] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0027] like Figures 1 to 6 As shown, this application provides a battery pack 100, which includes at least a housing 40, a partition beam 31, at least two battery packs 10, and at least two partition plates 2. The housing 40 includes a base plate and a frame fixed to the outer periphery of the base plate. The base plate and the frame form a receiving cavity for accommodating various structures required for the battery pack 100.

[0028] Specifically, the aforementioned enclosure can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0029] The enclosure may include a lower enclosure and an upper enclosure. The lower enclosure includes a base plate and a frame connecting to and surrounding the base plate. The upper enclosure is connected to the frame and has a cover plate opposite to the base plate. The upper and lower enclosures together form a receiving cavity. The frame and base plate can be integrally formed or manufactured separately and then fixedly connected. Specifically, the frame and base plate are fixedly connected by welding, riveting, screwing, etc. In the case of a cubic enclosure, the frame of the lower enclosure generally has four side plates surrounding the perimeter of the base plate. In other embodiments, the shape of the enclosure can also be cylindrical or other shapes. The frame mainly serves to support, protect, and connect. The frame can be formed by splicing multiple beams together. The frame can be rectangular, circular, polygonal, etc., without limitation. The beams of the frame can be solid structures or contain cavities. The base plate is the main load-bearing component of the battery pack, used to support and fix the battery pack, battery management system, cooling system, and other components inside the battery pack. The enclosure can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0030] A partition beam is installed within the housing cavity to divide the cavity into at least two sub-spaces, which can serve as battery compartments. The partition beam can be a strip structure, with its two ends connected to the two sides of the housing frame, thus dividing the housing into two sub-spaces located on either side of the partition beam. The partition beam can be made of metal or integrally molded using rubber injection molding, plastic injection molding, or molding molding. The plastic used in plastic injection molding can be polyethylene, polypropylene, ABS, PA, polystyrene, etc. The partition beam can be manufactured by die casting or other methods such as extrusion molding, and then welded to the housing.

[0031] like Figures 1 to 3 As shown, the partition beam 31 is configured to extend along a first direction of the battery pack and be fixedly connected to the frame and / or base plate to divide the cavity into at least two battery compartments 42 distributed along the first direction, with each battery pack 10 correspondingly disposed in each battery compartment 42.

[0032] like Figures 1 to 4 As shown, the battery pack 10 includes at least a plurality of battery cells 1 arranged in an array along a first direction and a second direction. Both the first direction and the second direction are parallel to the large surface of the base plate. When both the first direction and the second direction are parallel to the large surface of the base plate, it is obvious that both the first direction and the second direction are perpendicular to the height direction of the battery cell 1, and the first direction and the second direction are also perpendicular to each other; that is, the height direction of the battery cell 1 is perpendicular to the base plate of the housing 40.

[0033] In this configuration, a row of battery cells 1 arranged along a first direction constitutes a battery row, and a row of battery cells 1 arranged along a second direction constitutes a battery column. Each battery cell 1 has a first side 11 perpendicular to the first direction.

[0034] In existing battery packs, because the battery packs inside the box are interconnected, if one battery pack experiences thermal runaway, it will quickly trigger thermal runaway of the adjacent battery packs, rendering the entire battery pack inoperable and posing a significant safety risk to electric vehicles, electric aircraft, and other equipment, as well as to personnel and the environment.

[0035] Therefore, in the battery pack of this application embodiment, by independently compartmentalizing multiple battery groups 10, different battery groups 10 can be individually connected in parallel and / or in series. The partition beam 30 can reduce the impact of thermal runaway between adjacent battery groups 10, and even if one battery group 10 experiences thermal runaway, it can prevent cascading thermal runaway between adjacent battery groups 10. The battery groups can be connected in series, parallel, or mixed, increasing the variety of application scenarios for the battery pack.

[0036] However, in order to save space, the battery pack described above only has a partition beam 31 along the first direction of the battery pack, and lacks a reinforcing beam in the second direction perpendicular to the partition beam 31. When the battery pack 10 is subjected to vibration, the partition beam 31, which is only provided along the first direction of the battery pack, is difficult to bear the pressure. This results in a greater risk of vibration deformation of the partition beam and the battery, making it easy for the battery to detach from the base plate, causing the battery to come off from the top. There is also a greater risk of breakage at the connection between the adjacent battery conductive bar and the battery terminal, which affects the overall safety of the battery.

[0037] Therefore, in order to improve the structural strength of the battery pack in the second direction according to the embodiments of this application, such as Figures 1 to 3 and Figure 5 As shown, each partition plate 2 is located between two rows of battery cells 1 arranged along the first direction, and both sides of the partition plate 2 are fixedly connected to the first side 11 of at least two battery cells 1 arranged along the second direction.

[0038] In the battery pack 100 of this embodiment, since there are no crossbeams arranged along the first direction, in order to improve the overall strength in the second direction and increase the reinforcement of the housing 40 in the second direction, a partition plate 2 is provided between the two rows of battery cells 1 arranged along the first direction. Both sides of the partition plate 2 are fixedly connected to the first side 11 of at least two battery cells 1 arranged along the second direction. The partition plate 2 can strengthen the strength of the battery pack 100 in the second direction. The partition plate 2 and the battery cells 1 can be directly fixedly connected by means of bonding, riveting, welding, etc., or indirectly fixedly connected by other structures. No limitation is made here.

[0039] In one embodiment of this application, the partition plate 2 is an epoxy resin board or a metal plate with insulating layers on both sides. When the partition plate 2 is an epoxy resin board or a metal plate with insulating layers on both sides, it not only facilitates processing but also effectively provides supporting strength. It is understood that the aforementioned insulating layer can be any of the aforementioned insulating film, insulating coating, or aluminum oxide layer, boron nitride layer, titanium carbide layer, or other layered structures with insulating and high-temperature resistance properties, and is not limited herein.

[0040] like Figure 4 As shown, an insulating member 6 is provided on the first side 11 where the battery cell 1 is fixedly connected to the separator 2. A first window area 61 is provided on the insulating member of the first side 11. The casing of the battery cell 1 is exposed at the position of the first window area 61. At least a portion of the casing exposed in the first window area 61 is bonded and fixed to the separator 2.

[0041] Specifically, the insulating component 6 is disposed on the outer surface of the battery's metal casing to improve the insulation performance of the battery's outer surface. It can be attached to the outer surface of the casing by adhesive bonding or coating. The insulating component 6 can be at least one of an insulating sheet, an insulating film, or an insulating coating, wherein the material of the insulating film can be polyethylene terephthalate (PET), polyimide (PI), polypropylene (PP), polyethylene (PE), etc.

[0042] The materials for the insulating coating can be modified epoxy resin, insulating polyacrylate, polyethylene terephthalate, oil-based insulating resin, water-based insulating resin, or styrene-butadiene rubber latex, etc. The main materials of the insulating resin include epoxy resin, acrylic resin, polyurethane resin, hydroxyl acrylic resin, and other multifunctional resins. It may also include various additives, such as photoinitiators, reactive diluents, flame retardants, wetting agents, leveling agents, and defoamers. Because at least some of the battery cells 1 have a first window area 61 on the insulating part 6 of the first side 11, the shell of the battery cell 1 at the first window area 61 is exposed. At least a part of the shell exposed in the first window area 61 is bonded and fixed to the partition plate 2, that is, at least a part of the partition plate 2 is directly bonded and fixed to the shell of the first window area 61 of the battery cell 1, and the remaining part can be bonded and fixed to the insulating part 6 of the battery cell. The above structure can ensure a stable connection between the partition plate 2 and the battery cell 1, and avoid the partition plate 2 tearing the insulating part 6 when the battery cell 1 vibrates. This makes the internal structure of the battery pack 100 with only the partition beam 31 more stable, and there is no need to set up separate cross and longitudinal beams to reinforce the box 40 to constrain and fix the battery, thereby improving the energy density of the battery in the battery pack 100.

[0043] like Figure 4As shown, in one embodiment of this application, for a battery cell 1 with a first window area 61 provided on the insulating member 6 of the first side 11, the area of ​​the first window area 61 on the first side 11 with the first window area 61 is S(1), in mm. 2 The area of ​​the first side 11 is S(2), in mm. 2 ,10%≤S(1) / S(2)≤95%.

[0044] When the area of ​​the first window area 61 is S(1) and the area of ​​the first side 11 is S(2), it is difficult to ensure that S(1) / S(2) is less than 10%, and it is difficult to ensure that the separator 2 and the battery cell 1 are firmly connected. When the area of ​​the first window area 61 is S(1) and the area of ​​the first side 11 is S(2), it is difficult to ensure that S(1) / S(2) is greater than 95%, and it is difficult to ensure the coverage area of ​​the insulating member 6 on the first side 11, which affects the insulation performance of the insulating member 6 on the first side 11.

[0045] Therefore, when the area of ​​the first window area 61 is S(1) and the area of ​​the first side 11 is S(2), which satisfies 10%≤S(1) / S(2)≤95%, it can ensure both the stable connection between the separator 2 and the battery cell 1 and the coverage area of ​​the insulating component 6 on the first side 11, thereby ensuring the insulation performance of the insulating component 6 on the first side 11.

[0046] Furthermore, such as Figure 4 As shown, in one embodiment of this application, S(1) / S(2) satisfies 25% ≤ S(1) / S(2) ≤ 70%; the area of ​​the first window area 61 is S(1) and the area of ​​the first side 11.

[0047] When S(2) satisfies 25%≤S(1) / S(2)≤70%, it can further ensure the stable connection between the separator 2 and the battery cell 1, and further ensure the coverage area of ​​the insulating component 6 on the first side 11, thereby ensuring the insulation performance of the insulating component 6 on the first side 11. In a specific embodiment, the ratio of the area of ​​the first window area 61, S(1), to the area of ​​the first side 11, S(2), can be selected from specific values ​​such as 10%, 25%, 45%, 60%, 70%, 80%, 95%, etc., and is not limited here.

[0048] In the specific battery cell 1, the value range of S(2) is 11200 mm. 2 Up to 247500mm 2 For example, S(2) can be selected as 11200mm. 2 35000mm 2 125000mm 2 220000mm 2247500mm 2 The specific values ​​are as follows. The range of values ​​for S(1) can be obtained based on the above ratio limit, which will not be elaborated here.

[0049] like Figure 4 As shown, in one embodiment of this application, as Figure 4 As shown, in one embodiment of this application, in the second direction, the side edge of the first window area 61 is spaced apart from the side edge of the first side surface 11, with a spacing of 5 mm or more. That is, the extension length of the insulating member 6 on both sides of the first window area 61 is at least 5 mm or more. The above structure can ensure the extension length of the insulating member 6 at both sides of the first side surface 11, and avoid short circuits between the shell of the first window area 61 and the other battery cells 1 of the battery pack 100.

[0050] like Figure 4 As shown, in one embodiment of this application, the bottom surface of the battery cell 1 is bonded to the base plate by an adhesive layer. In the height direction, the bottom edge of the first window area 61 is spaced apart from the adhesive layer, with a spacing of greater than or equal to 3 mm.

[0051] In the battery pack of this application embodiment, the bottom surface of the battery cell 1 is bonded to the base plate by an adhesive layer, thereby fixing the bottom surface of the battery cell 1 by the adhesive layer. Since the bottom edge of the first window area 61 is spaced apart from the adhesive layer in the height direction, and the spacing distance is greater than or equal to 3mm, it can effectively prevent the battery cell 1 from squeezing the bottom adhesive layer, causing part of the adhesive layer to spread upward to the first window area 61 on the side of the battery casing 1. This ensures that the partition plate 2 can remain flat after being bonded and fixed at the first window area 61. It can also effectively ensure the extension length of the insulating member 6 near the bottom surface of the battery cell 1, and prevent short circuit between the casing of the first window area 61 and the battery pack 100.

[0052] like Figure 4 As shown, in one embodiment of this application, in the height direction, the top edge of the first window area 61 and the top edge of the first side surface 11 are spaced apart by a distance greater than or equal to 5 mm.

[0053] In the battery pack 100 of this application embodiment, the extension length of the insulating member 6 at the top edge of the first window area 61 is at least greater than or equal to 5mm. The above structure can ensure the extension length of the insulating member 6 near the top surface of the battery cell 1, and avoid short circuit between the shell of the first window area 61 and the top conductive bar 3.

[0054] In one embodiment of this application, the exposed housing area of ​​the first window area 61 is bonded and fixed to the partition plate 2. Since the exposed housing area of ​​the first window area 61 is bonded and fixed to the partition plate 2, the connection strength between the partition plate 2 and the battery cell 1 can be further improved, further preventing the partition plate 2 from tearing the insulating member 6 when the battery cell 1 vibrates, and ensuring the insulation effect of the insulating member 6 on the first side 11.

[0055] In one embodiment of this application, the first window area 61 on the first side 11 includes at least two sub-window areas 611; the sub-window areas 611 are distributed on the first side 11. In this way, at least a portion of the partition plate 2 is bonded and fixed to each of the sub-window areas 611 of the first window area 61. The above structure can ensure that each area of ​​the partition plate 2 can form a stable connection with the battery cell 1, and further avoid the partition plate 2 tearing the insulation member 6 when the battery cell 1 vibrates.

[0056] In one embodiment of this application, the first side surface 11 is the surface with the largest area of ​​the battery cell 1. In this way, the surface with the largest area of ​​the battery cell 1 is perpendicular to the extension direction of the separator beam 31, which provides the best structural reinforcement effect in the battery pack 100.

[0057] like Figure 4 As shown, in one embodiment of this application, the battery cell further has a second side 12 perpendicular to the second direction, and the width of the first side 11 is greater than the width of the second side 12. The width of the first side 11 is the dimension of the first side 11 parallel to the second direction; the width of the second side 12 is the dimension of the second side 12 parallel to the first direction.

[0058] Each battery cell 1 within the battery pack 10 is electrically connected to each other to facilitate the output of electrical energy from the battery pack 10. Since the battery cell 1 has a first side 11 perpendicular to the first direction and a second side 12 perpendicular to the second direction, and the width of the first side 11 is greater than the width of the second side 12, that is, the first side 11 is the larger side of the battery cell 1 in this embodiment of the application, and the second side 12 is the smaller side of the battery cell 1 in this embodiment of the application.

[0059] It is understandable that, since the width of the first side 11 is greater than the width of the second side 12, the first side 11 is the larger side of the battery cell 1, and the second side 12 is the smaller side of the battery cell 1, the partition plate 2 is fixedly connected to the first side 11 of the battery cell 1, which can improve the shear force that the battery cell 1 and the housing 40 can withstand, and ensure the connection strength between the battery pack 10 and the housing 40 in the battery pack.

[0060] Furthermore, such as Figure 4As shown, the insulating member 6 is also disposed on the second side 12 of the battery cell 1, and the insulating member 6 is also disposed on at least a portion of the second side 12. At least one second side 12 of the battery cell 1 is fixedly connected to the second side 12 of an adjacent battery cell 1. Therefore, the insulating member 6 disposed on the second side 12 of the battery cell 1 can ensure the insulation performance of the second side 12 of the battery cell 1, and the fixed connection between at least one second side 12 of the battery cell 1 and the second side 12 of an adjacent battery cell 1 can ensure the fixed connection between adjacent battery cells 1 in the second direction.

[0061] like Figure 1 As shown, in another embodiment of this application, in each battery pack 10, a heat insulation pad is provided between the battery cells 1 arranged along the second direction, and at least one second side 12 of the battery cell 1 is fixedly connected to the heat insulation pad. The heat insulation pad can prevent the spread of thermal runaway, block heat transfer, delay the spread of thermal runaway, protect the overall safety of the battery pack 100, reduce mutual compression and collision between battery cells 1, absorb vibration and shock, and extend battery life; maintain the internal temperature stability of the battery pack 100, reduce heat loss or the influence of external high temperature, ensure battery performance, and also be flame-retardant and fireproof.

[0062] In one embodiment of this application, the area S(2) of the first side 11 is greater than the area S(3) of the second side 12, and S(3) / S(2) satisfies 12.5% ​​≤ S(3) / S(2) ≤ 80%. When S(3) / S(2) satisfies 12.5% ​​≤ S(3) / S(2) ≤ 80%, and the partition plate 2 is fixedly connected to the first side 11 of the battery cell 1, the shear force that the battery cell 1 and the housing 40 can withstand can be further improved, ensuring the connection strength between the battery pack 10 and the housing 40 in the battery pack.

[0063] In a specific battery cell 1, the specific value of S(3) / S(2) can be selected as 12.5%, 25%, 40%, 70%, 80%, etc., and the value range of S(3) can be 1600 mm. 2 Up to 37500mm 2 For example, S(3) can be selected as 1600mm. 2 5500mm 2 17500mm 2 25000mm 2 37500mm 2 Specific values ​​are not limited here. Furthermore, such as... Figure 4As shown, in one embodiment of this application, at least one insulating member 6 on the second side 12 is provided with a second window area 62, and the shell of the battery cell 1 at the second window area 62 is exposed. In this way, the shell at the second window area 62 can be fixedly connected to the heat insulation pad, or the shell at the second window area 62 can be fixedly connected to the shell at the second window area 62 of the second side 12 of the adjacent battery cell 1, so as to further ensure the connection strength between adjacent battery cells, making the internal structure of the battery pack 100 with only the partition beam 31 more stable, eliminating the need to separately set up cross and longitudinal beams to reinforce the box 40 to constrain and fix the battery, thereby improving the energy density of the battery in the battery pack 100.

[0064] Furthermore, in one embodiment of this application, on the second side 12 where the second window area 62 is provided, the area of ​​the second window area 62 is S(4), in mm. 2 The area of ​​the second side 12 is S(3), in mm. 2 S(4) / S(3) satisfies 10% ≤ S(4) / S(3) ≤ 95%.

[0065] When the area S(4) of the second window area 62 and the area S(3) of the second side 12 satisfy S(4) / S(3) is less than 10%, it is difficult to ensure a stable connection between the second side 12 of the battery cell and the heat insulation pad or the second side 12 of the adjacent battery cell 1; when the area S(4) of the second window area 62 and the area S(3) of the second side 12 satisfy S(4) / S(3) is greater than 95%, it is difficult to ensure the coverage area of ​​the insulating member 6 on the second side 12, affecting the insulation performance of the insulating member 6 on the second side 12.

[0066] Therefore, when the area S(4) of the second window area 62 and the area S(3) of the second side 12 satisfy 10% ≤ S(4) / S(3) ≤ 95%, it can ensure both a stable connection between the second side 12 of the battery cell and the heat insulation pad or the second side 12 of another adjacent battery cell 1, and also ensure the coverage area of ​​the insulating member 6 on the second side 12, thereby ensuring the insulation performance of the insulating member 6 on the second side 12. In a specific battery cell 1, the specific value of S(4) / S(3) can be selected from 10%, 25%, 40%, 54%, 70%, 95%, etc., and is not limited here.

[0067] In one embodiment of this application, the insulating member 6 further covers the top and / or bottom surfaces of at least a portion of the battery cell 1. Because the insulating member 6 is provided on the top and / or bottom surfaces of the battery cell 1, it effectively prevents the top and / or bottom surfaces of the battery cell 1's casing from connecting to the base plate or conductive surfaces, ensuring that the battery cell 1 in this embodiment can function normally.

[0068] This application also provides an electrical device that includes at least one of the aforementioned battery packs 100. It is understood that this electrical device can be various types of electrical devices, such as electric vehicles, battery-powered appliances, and energy storage devices, and is not limited thereto.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

[0070] Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery pack (100), characterized in that, include: The box (40) includes a bottom plate and a frame fixed to the outer periphery of the bottom plate, the bottom plate and the frame forming a receiving cavity; A partition beam (31) is configured to extend along a first direction of the battery pack (100) and be fixedly connected to the frame and / or base plate to divide the cavity into at least two battery compartments (42) distributed along the first direction. At least two battery packs (10) are provided in each of the battery compartments (42). Each battery pack (10) includes at least a plurality of battery cells (1) arranged in an array along a first direction and a second direction. The first direction and the second direction are parallel to the large surface of the bottom plate. Each battery cell (1) has a first side (11) perpendicular to the first direction. At least two partition plates (2), at least one of the partition plates (2) is located between two rows of battery cells (1) arranged along a first direction, and both sides of the partition plate (2) are fixedly connected to the first side (11) of at least two battery cells (1) arranged along a second direction; The battery cell (1) has an insulating member (6) on the first side (11) which is fixedly connected to the partition plate (2). The insulating member (6) on the first side (11) has a first window area (61). The shell of the battery cell (1) is exposed at the position of the first window area (61). At least a portion of the shell exposed in the first window area (61) is bonded and fixed to the partition plate (2).

2. The battery pack (100) according to claim 1, characterized in that, On the first side (11) where the first window area is located, the area of ​​the first window area is S(1), in mm. 2 The area of ​​the first side surface (11) is S(2), in mm. 2 S(1) / S(2) satisfies 10% ≤ S(1) / S(2) ≤ 95%.

3. The battery pack (100) according to claim 1, characterized in that, The first side (11) is the surface with the largest area of ​​the battery cell (1).

4. The battery pack (100) according to claim 1, characterized in that, The battery cell (1) also has a second side (12) perpendicular to the second direction, and the insulating member (6) is also provided on at least part of the second side (12). At least one second side (12) of the battery cell (1) is fixedly connected to the heat insulation pad or to the second side (12) of the adjacent battery cell (1).

5. The battery pack (100) according to claim 4, characterized in that, The area S(2) of the first side (11) is greater than the area S(3) of the second side (12), and S(3) / S(2) satisfies 12.5% ​​≤ S(3) / S(2) ≤ 80%.

6. The battery pack (100) according to claim 4, characterized in that, At least one of the insulating members (6) on the second side (12) is provided with a second window area (62), and the casing of the battery cell (1) is exposed at the location of the second window area (62).

7. The battery pack (100) according to claim 5, characterized in that, On the second side (12) where the second window area (62) is provided, the area of ​​the second window area (62) is S (4), in mm. 2 The area of ​​the second side (12) is S(3), in mm. 2 S(4) / S(3) satisfies 10% ≤ S(4) / S(3) ≤ 95%.

8. The battery pack (100) according to claim 4, characterized in that, The insulating element (6) also covers the top and / or bottom surfaces of at least a portion of the battery cell (1).

9. The battery pack (100) according to any one of claims 1-8, characterized in that, In the second direction, the side edge of the first window area (61) is spaced apart from the side edge of the first side surface (11) by a distance greater than or equal to 5 mm.

10. The battery pack (100) according to any one of claims 1-8, characterized in that, The bottom surface of the battery cell (1) is bonded to the base plate by an adhesive layer. In the height direction, the bottom edge of the first window area (61) is spaced apart from the adhesive layer by a distance greater than or equal to 3 mm.

11. The battery pack (100) according to any one of claims 1-8, characterized in that, In the height direction, the top edge of the first window area (61) is spaced apart from the top edge of the first side surface (11) by a distance greater than or equal to 5 mm.

12. The battery pack (100) according to any one of claims 1-8, characterized in that, The shell area exposed in the first window area (61) is bonded and fixed to the partition plate (2).

13. The battery pack (100) according to any one of claims 1-8, characterized in that, The first window area (61) on the first side (11) includes at least two sub-window areas (611); the sub-window areas (611) are distributed on the first side (11).

14. The battery pack (100) according to any one of claims 1-8, characterized in that, The insulating component includes at least one of insulating sheets, insulating films, and insulating coatings.

15. The battery pack (100) according to any one of claims 1-8, characterized in that, The partition plate (2) is an epoxy resin plate or a metal plate with an insulating layer on both sides.

16. An electrical appliance, characterized in that, It includes at least one battery pack (100) according to any one of claims 1 to 15.

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