Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, relates to the technical field related to batteries, and is used for solving the problem that when the bottom of an existing battery box is collided, a single battery is damaged, and the battery fails. The battery pack provided by the utility model comprises a top cover, a frame and a bottom plate which are used for jointly limiting an accommodating space, wherein the top cover and the bottom plate are respectively connected to two sides of the frame in a first direction; the support comprises a main body part and a supporting part, the main body part is connected with the top cover and the bottom plate, the supporting part is connected to the side, facing the bottom plate, of the main body part and connected with the bottom plate, and the supporting part is provided with a first plate face back to the bottom plate; the buffer layer is arranged in the accommodating space and is connected with the first board surface; the buffer layer is arranged in the accommodating space and is connected with the first board surface; the single battery comprises a shell, the shell is provided with a first side part facing the bottom plate, and the first side part is connected with one side, facing the top cover, of the buffer layer; wherein the size of the main body part in the second direction is smaller than that of the supporting part in the second direction.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] In recent years, the emergence of new energy vehicles has significantly boosted social development and environmental protection. Power batteries, as rechargeable batteries, are the power source for these vehicles and are widely used in this field. However, in some cases, existing batteries have poor rigidity and are unable to directly withstand the loads imposed by other components of electrical devices, which can easily lead to safety accidents and compromise the safety of these devices.

[0003] For example, existing battery packs typically include a housing that forms a storage space within which individual batteries are housed. When the bottom of the housing collides with an obstacle, the resulting force can cause the bottom of the housing to deform. This upward deformation can impact or squeeze the individual batteries. Consequently, when the battery housing is deformed by impact from below, the housing can come into contact with the individual batteries, damaging them and potentially causing battery failure, impacting the safety of the electrical device. Utility Model Content

[0004] The present application provides a battery pack and an electrical device, which can solve the problem that when the bottom of the existing battery box collides, it will contact with the single battery and cause damage to the single battery, resulting in battery failure.

[0005] To achieve the above-mentioned purpose, the battery pack provided in the present application has a first direction Z, and the battery pack includes:

[0006] The box body comprises a top cover, a frame and a bottom plate, wherein the top cover and the bottom plate are respectively connected to two sides of the frame in the first direction to jointly define a storage space;

[0007] a bracket disposed in the accommodating space, the bracket comprising a main body and a supporting portion, the main body being supported between the top cover and the bottom plate and connected to the top cover and the bottom plate, respectively, the supporting portion being connected to a side of the main body facing the bottom plate and connected to the bottom plate, the supporting portion having a first plate surface facing away from the bottom plate;

[0008] a buffer layer, disposed in the accommodation space and connected to the first plate surface;

[0009] a single battery disposed in the accommodation space, the single battery comprising a housing, the housing having a first side facing the bottom plate, the first side being connected to a side of the buffer layer facing the top cover;

[0010] Wherein, a dimension D1 mm of the main body portion in the second direction is smaller than a dimension D2 mm of the support portion in the second direction.

[0011] In this technical solution, the main body of the bracket is supported between the top cover and the bottom plate and connected to each of these plates. The support portion of the bracket is connected to the first side of the single cell via a buffer layer. When the bottom plate collides with an obstacle and deforms, part of the impact force is transmitted through the main body to the top cover, and the remaining part is transmitted to the buffer layer via the support portion. The buffer layer reduces the impact force transmitted to the single cell. This collision force treatment solution reduces the probability of single cells colliding with the bottom plate and causing damage, which in turn leads to battery failure. Furthermore, the dimension D1mm of the main body of the bracket in the second direction X is smaller than the dimension D2mm of the support portion of the bracket in the second direction X. This allows the buffer layer to withstand more impact force, preventing the bottom plate of the battery pack from being ruptured due to excessive impact force.

[0012] In some embodiments of the present application,

[0013] The side of the main body facing away from the support portion is directly connected to the top cover;

[0014] Alternatively, the shell has a second side facing the top cover, and the bracket also includes a connecting portion, which is connected to at least one side of the main body in the second direction X, and the connecting portion is located between the second side and the top cover and contacts the second side.

[0015] In some embodiments of the present application, a dimension H1 mm of the first gap in the first direction Z satisfies: 0.2≤H1≤10.

[0016] In some embodiments of the present application, in the first direction Z, there is a second gap between the bottom plate and the first side of the shell of the single battery. The size of the second gap in the first direction Z is H2 mm and satisfies: 3≤H2≤35, and H2>H1.

[0017] In some embodiments of the present application, in the second direction X, the size of the main body is D1 mm and satisfies: 0.5≤D1≤30.

[0018] In some embodiments of the present application, the battery pack further has a third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other;

[0019] The shell includes two side walls 213 extending along the third direction Y and arranged opposite to each other. Two poles are provided on the first side portion. In the second direction X, the size of the portion of the support portion supported by the buffer layer is D2mm, and the size between the two side walls and the poles close to them is D3mm, and satisfies: D2=(0.25~1)D3.

[0020] In some embodiments of the present application, in the second direction X, the size of the single battery is L mm, the size of the connecting portion in the second direction X is D4 mm, and the following condition is satisfied: 0<D4≤L / 2.

[0021] In some embodiments of the present application, the battery pack further has a second direction X, a plurality of the brackets are arranged in sequence along the second direction X, the single cells are arranged between two adjacent brackets, and the single cells are supported on the buffer layers of the two adjacent brackets.

[0022] In some embodiments of the present application, the battery pack further has a second direction X, a plurality of the brackets are arranged in sequence along the second direction X, the single cells are arranged between two adjacent brackets, and at least one of the brackets simultaneously supports two adjacent single cells in the second direction X.

[0023] In some embodiments of the present application, the battery pack further has a third direction Y, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other, a plurality of the single batteries are arranged along the third direction Y, and at least one of the brackets simultaneously supports the plurality of the single batteries arranged along the third direction.

[0024] In some embodiments of the present application, the battery pack further includes:

[0025] The cooling assembly is arranged on a side of the top cover facing the bottom plate, and / or on a side of the main body facing the single battery.

[0026] In some embodiments of the present application, the buffer layer includes at least one of silicone foam, silicone sheet and structural adhesive.

[0027] On the other hand, the present application also provides an electrical device, comprising a battery pack as described in any of the above technical solutions.

[0028] Since the electrical device provided in the present application includes a battery pack as described in any of the above technical solutions, both can solve the same problem and achieve the same effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a three-dimensional diagram of a battery pack in one embodiment of the present application;

[0031] Figure 2 is an exploded view of a battery pack in one embodiment of the present application;

[0032] Figure 3 is a cross-sectional view of a battery pack in one embodiment of the present application;

[0033] Figure 4 This is a schematic structural diagram of a bracket in a battery pack in one embodiment of the present application;

[0034] Figure 5 is a structural diagram of a battery pack in another embodiment of the present application;

[0035] Figure 6 This is a schematic structural diagram of a bracket in a battery pack in another embodiment of the present application;

[0036] Figure 7 yes Figure 3 A magnified view of part A in FIG;

[0037] Figure 8 yes Figure 5 A magnified view of part B in FIG;

[0038] Figure 9 This is a schematic diagram of the structure of a single battery in a battery pack in an embodiment of the present application;

[0039] Figure 10 It is a schematic structural diagram of the cooling assembly in the battery pack in an embodiment of the present application.

[0040] The main reference numerals in the drawings of this application specification are described as follows:

[0041] 10-box body; 11-top cover; 12-frame; 13-bottom plate; 120 accommodating space;

[0042] 20 - single cell; 21 - housing; 211 - first side; 212 - second side; 213 - side wall; 22 - pole; 23 - cover; 24 - explosion-proof valve;

[0043] 30-bracket; 31-main body; 32-support portion; 321-first plate surface; 33-connecting portion;

[0044] 40- buffer layer;

[0045] 50-cooling assembly; 51-liquid cooling plate; 52-channel;

[0046] 20a-first gap;

[0047] 20b-Second gap. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0049] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0050] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0052] The present application provides a battery pack and an electrical device, which are described in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments of the present application. In addition, in the following embodiments, the description of each embodiment has its own focus. For parts not detailed in one embodiment, please refer to the relevant description of other embodiments.

[0053] Figure 1is a three-dimensional diagram of the battery pack in the embodiment of the present application, Figure 2 This is an exploded view of the battery pack in the embodiment of the present application. Figure 3 : is a cross-sectional view of the battery pack in the embodiment of the present application. Figures 1 to 3 The battery pack provided in the present application has a first direction Z and a second direction X that intersect each other. The battery pack includes a case 10, a bracket 30, a buffer layer 40 and a single battery 20. The case 10 includes a top cover 11, a frame 12 and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to both sides of the frame 12 in the first direction Z to jointly define a storage space 120. The bracket 30 is arranged in the storage space 120. The bracket 30 includes a main body 31 and a support portion 32. The main body 31 is supported between the top cover 11 and the bottom plate 13 and is respectively connected to the top cover 11 and the bottom plate 13. The support portion 32 is connected to the side of the main body 31 facing the bottom plate 13 and is connected to the bottom plate 13. The support portion 32 has a first plate surface 321 facing away from the bottom plate 13. The buffer layer 40 is arranged in the storage space 120 and is connected to the first plate surface 321. The single battery 20 is disposed within the accommodation space 120 and includes a housing 21. The housing 21 has a first side portion 211 facing the bottom plate 13. The first side portion 211 is connected to the side of the buffer layer 40 facing the top cover 11. The dimension D1 mm of the main body 31 in the second direction X is smaller than the dimension D2 mm of the support portion 32 in the second direction X.

[0054] In this technical solution, the main body 31 of the bracket 30 is supported between the top cover 11 and the bottom plate 13 and connected to each of these. The support portion 32 of the bracket 30 is connected to the first side portion 211 of the single cell 20 via the buffer layer 40. When the bottom plate 13 collides with an obstacle and deforms, part of the impact force is transmitted through the main body 31 to the top cover 11, and the remaining part is transmitted to the buffer layer 40 through the support portion 32. The buffer layer 40 reduces the impact force transmitted to the single cell 20. This collision force treatment solution reduces the probability of single cell 20 colliding with the bottom plate 13 and causing damage, which could lead to battery failure. Furthermore, the dimension D1mm of the main body 31 in the second direction X is smaller than the dimension D2mm of the support portion 32 in the second direction X. This allows the buffer layer 40 to withstand more impact force, preventing the bottom plate 13 of the battery pack case 10 from being broken by excessive impact force.

[0055] Specifically, the bottom of the frame 12 has an opening, and the bottom plate 13 is covered by the opening. The connection between the bottom plate 13 and the frame 12 can be threaded, snap-fit, or welded, which is not specifically limited in this application. Similarly, the connection between the bracket 30 and the bottom plate 13 can be welded, bonded, snap-fit, or threaded, which is not specifically limited in this application.

[0056] Continue to refer to Figure 3The above-mentioned single battery 20 includes a shell 21 and a terminal 22. The shell 21 has a first side portion 211 facing the bottom plate 13, and the terminal 22 is provided on the first side portion 211. The first side portion 211 is supported on the buffer layer 40. In other words, in the first direction Z, there is a first gap 20a between the first side portion 211 of the single battery 20 and the support portion 32 of the bracket 30. The buffer layer 40 is located in the first gap 20a. Figure 7 As shown. That is, the above-mentioned pole 22 protrudes downward from the lower surface of the shell 21, the lower surface of the shell 21 faces the upper surface of the bottom plate 13, and the buffer layer 40 is supported between the lower surface of the shell 21 and the bottom plate 13. In this embodiment, the present application installs the single battery 20 upside down in the box 10, which can enhance the overall rigidity of the battery pack and reduce the probability of damage to the battery pack. In addition, because the above-mentioned pole 22 faces the top cover 11 below, and the passenger is closer to the top cover 11 than the bottom plate 13, when the single battery 20 suffers thermal runaway, the above-mentioned arrangement can maximize the protection of passenger safety.

[0057] It should be noted that the first side portion 211 is supported by the buffer layer 40, meaning that the projection of the terminal 22 onto the base plate 13 is offset from the projection of the buffer layer 40 onto the base plate 13, thereby improving the energy density of the battery pack. Specifically, in the first direction Z, the buffer layer 40 is larger than the projection of the terminal 22 beyond the first side portion 211. In other words, there is a gap between the terminal 22 and the base plate 13 in the first direction Z, and the two do not contact each other.

[0058] In some embodiments, as Figure 3 and Figure 4 As shown, the side of the main body 31 facing away from the support portion 32 is directly connected to the top cover 11. This means that the bracket 30 is in an inverted "T" shape, with its ends contacting and connecting with the top cover 11 and the bottom plate 13, respectively. This simple structure of the bracket 30 helps improve the energy density of the battery pack. It should be noted that since the brackets 30 at the farthest ends only need to support a single battery cell 20, to reduce the size of the housing 10 in the second direction X, the brackets 30 at the two ends in the second direction X are L-shaped.

[0059] In other embodiments, Figure 5 and Figure 6As shown, the housing 21 has a second side portion 212 facing the top cover 11. The bracket 30 further includes a connecting portion 33. The connecting portion 33 is connected to at least one side of the main body portion 31 in the second direction X, and is located between the second side portion 212 and the top cover 11 and contacts the second side portion 212 and / or the top cover 11. That is, the bracket 30 is generally in an "I" shape. Setting the connecting portion 33 can increase the contact area between the bracket 30 and the top cover 11, which is beneficial to enhancing the overall strength of the battery. It should be noted that since the brackets 30 at the two outermost ends only need to support one single battery 20, in order to reduce the size of the box body 10 in the second direction X, the brackets 30 at both ends in the second direction X are in a "C" shape.

[0060] Hereinafter, the same parts of the above two types of brackets 30 will be described in detail.

[0061] Referring to Figure 7 and Figure 8 , the size of the first gap 20a in the first direction Z is H1 mm and satisfies: 0.2 ≤ H1 ≤ 10, so as to ensure that the buffer layer 40 has an appropriate thickness in the first direction Z, and further ensure the buffering effect of the buffer layer 40. At the same time, it can also prevent the size H1 mm of the first gap 20a in the first direction Z from being too large, resulting in a low energy density of the battery pack.

[0062] In the first direction Z, there is a second gap 20b between the bottom plate 13 and the first side portion 211 of the housing 21 of the single battery 20. The size of the second gap 20b in the first direction Z is H2 mm and satisfies: 3 ≤ H2 ≤ 35, and H2 > H1, so as to prevent the size H2 mm of the second gap 20b in the first direction Z from being too large, resulting in too large or too small volume utilization rate of the battery pack and affecting battery safety. At the same time, it can also prevent the second gap 20b from being too small, which is not conducive to the installation of the bracket 30 and the buffer layer 40. It can be understood that the size of the above support portion 32 in the first direction Z is H3 mm and satisfies: H3 = H2 - H1.

[0063] In the second direction X, the size of the main body portion 31 is D1 mm and satisfies: 0.5 ≤ D1 ≤ 30. Thus, it can ensure that the main body portion 31 has a good support effect, and can also avoid the problem that due to the large size of the main body portion 31, the demand for the manufacturing material of the bracket 30 is large and the manufacturing cost is high.

[0064] In some embodiments, the battery pack further has a third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other; the shell 21 includes two side walls 213 extending along the third direction Y and arranged opposite to each other, and two poles 22 are provided on the first side portion 211. In the second direction X, the size of the portion of the support portion 32 supporting the buffer layer 40 is D2 mm, and the size between the two side walls 213 and the poles 22 close thereto is D3 mm, and satisfies: D2 = (0.25 ~ 1) D3, ensuring that the contact area between the buffer layer 40 and the first side portion 211 of the shell 21 is more appropriate, which is conducive to ensuring the buffering effect of the buffer layer 40.

[0065] The different parts of the bracket 30 of the above two structures are described in detail below.

[0066] Among them, Figure 5 and Figure 6 As shown, in this embodiment, the bracket 30 includes a connecting portion 33 provided on the top of the main body 31. In the second direction X, the size of the single battery 20 is Lmm, and the size of the connecting portion 33 in the second direction X is D4mm, and satisfies: 0<D4≤L / 2, ensuring the contact area between the connecting portion 33 and the top plate 11, so as to better transmit the collision force exerted on the bottom plate 13 to the top plate 11, thereby better avoiding damage to the battery pack.

[0067] The performance of the technical solution provided in the embodiments of this application is evaluated in conjunction with specific embodiments below.

[0068] Examples 1 to 24 are provided. In these examples, the dimension D3 mm between each of the two side walls 213 of the housing 21 and the adjacent poles 22, and the dimension L mm of the single battery 20 in the second direction X are constant. In the battery pack selected for this application, the dimension D3 between each of the two side walls 213 of the housing 21 and the adjacent poles 22 is 27 mm, and the dimension L of the single battery 20 in the second direction X is 208 mm.

[0069] It should be noted that the embodiment of the present application characterizes the overall structural strength of the battery pack through stress testing, applies stress to the battery pack to carry out stress testing, and detects the maximum stress that the battery pack can withstand during the test. Here, the mechanical impact test in GB38031-2020 can be used to detect the maximum stress F, and its unit is MPa. The greater the maximum stress that the battery pack can withstand, the higher the overall structural strength of the battery pack. The space utilization rate of the battery pack provided in the embodiment of the present application is characterized by energy density T, which is energy density T = battery pack power / battery pack weight = battery cell voltage * number of battery cells * battery cell capacity / battery pack weight, and its unit is: Wh / kg.

[0070] Specifically, Examples 1 to 5 satisfy 0.2≤H1≤10, and the remaining parameters are constant values, for example, H2, D1, D2, and D4. Examples 6 to 9 satisfy 3≤H2≤35, and the remaining parameters are constant values, for example, H1, D1, D2, and D4. Examples 10 to 14 satisfy 0.5≤D1≤30, and the remaining parameters are constant values, for example, H1, H2, D2, and D4. Examples 15 to 19 satisfy D2=(0.25~1)D3, and the remaining parameters are constant values, for example, H1, H2, D1, and D4. Examples 20 to 24 satisfy 0<D4≤0.5L, and the remaining parameters are constant values, for example, H1, H2, D1, and D2. Specific parameters and test results are detailed in Table 1.

[0071] In addition, comparative examples 1-4 are also provided. Comparative example 1-2 is a test in which a buffer layer is not provided. Comparative example 3 is a test in which the size of the support portion 32 in the second direction X exceeds the size between the side wall 213 and the pole 22 close thereto. Comparative example 4 is a test in which the size of the support portion 32 in the second direction X is less than 0.25 times the size between the side wall 213 and the pole 22 close thereto.

[0072] Table 1

[0073]

[0074]

[0075] Combining Examples 1 to 24 and Comparative Examples 1-4, it can be seen that:

[0076] (1) When the buffer layer 40 is not provided, the maximum stress of the battery pack is below 9 MPa. When the buffer layer 40 is provided, the maximum stress of the battery pack is above 9 MPa, which significantly improves the structural strength of the battery pack.

[0077] (2) When the buffer layer 40 is provided and D2 = (0.25-1)D3, the maximum stress of the battery pack is above 10 MPa, and the structural strength of the battery pack is relatively good.

[0078] The structure and size of the bracket 30 are described in detail above. Next, the arrangement of the bracket 30 will be described in detail.

[0079] In some embodiments of the present application, Figure 3 and Figure 5As shown, the battery pack also has a second direction X. Multiple brackets 30 are arranged in sequence along the second direction X. The single cells 20 are disposed between two adjacent brackets 30, and the single cells 20 are supported by the buffer layers 40 of the two adjacent brackets 30. That is, each single cell 20 is supported by the brackets 30 at both ends of the second direction X. The buffer layers 40 can buffer the impact force transmitted to the single cell 20 by the bottom plate 13. The impact force can be dispersed by the two brackets 30 located on both sides of the single cell 20, effectively reducing stress concentration and thus preventing damage to the single cell 20.

[0080] It can be understood that each single battery 20 is supported by its two corresponding brackets 30. For example, if the battery pack includes two single batteries 20, four brackets 30 are required to support the two single batteries 20. The four brackets 30 are arranged in sequence along the second direction X, and no single battery 20 is placed between the middle two brackets 30. The middle two brackets 30 can have a gap between them or can be close to each other, which is not limited in this application.

[0081] In some embodiments of the present application, the battery pack further has a second direction X, a plurality of brackets 30 are spaced apart along the second direction X, the single cells 20 are arranged between two adjacent brackets 30, and at least one bracket 30 simultaneously supports two adjacent single cells 20 in the second direction X, that is, the same bracket 30 can simultaneously support two adjacent single cells 20 in the second direction X, thereby reducing the number of brackets 30 required in the battery pack, which is beneficial to improving the production efficiency of the battery pack.

[0082] Based on the above embodiment, the battery pack further has a third direction Y, the first direction Z, the second direction X and the third direction Y are perpendicular to each other, a plurality of single cells 20 are arranged along the third direction Y, and at least one bracket 30 simultaneously supports the plurality of single cells 20 arranged along the third direction Y, that is, the same bracket 30 can simultaneously support the plurality of single cells 20 arranged along the third direction Y, thereby further reducing the number of brackets 30 and further improving the production efficiency of the battery pack.

[0083] At the same time, in order to ensure the supporting effect of the bracket 30 and the safety performance of the battery pack having the bracket 30 , the bracket 30 is made of a rigid insulating material, so that two adjacent single batteries 20 in the second direction X can be separated.

[0084] In some embodiments of the present application, the buffer layer 40 is made of a flexible material or an elastic material. For example, the buffer layer 40 includes at least one of silicone foam, silicone sheet, and structural adhesive.

[0085] In some embodiments of the present application, Figure 3 and Figure 9 The single battery 20 further includes a cover plate 23, which is disposed facing the bottom plate 13, and the pole 22 is passed through the cover plate 23. For example, an explosion-proof valve 24 is further disposed on the cover plate 23.

[0086] In some embodiments of the present application, reference is made to Figure 10 The battery pack further includes a cooling assembly 50, which is disposed on the side of the top cover 11 facing the bottom plate 13, and / or the cooling assembly 50 is disposed on the side of the main body 31 facing the single battery 20, so as to cool the single battery 20 and play a role in heat insulation and thermal runaway prevention. For example, the cooling assembly 50 includes a graphite heat conducting plate and a heat spreader. Alternatively, the cooling assembly 50 includes a liquid cooling plate 51 and a channel 52 disposed on the liquid cooling plate 51, the channel 52 being used for the flow of cooling medium to remove heat from the single battery 20, and the two ports of the channel 52 are respectively connected to an external supply device and a storage device.

[0087] In some embodiments of the present application, the present application further provides an electrical device including a battery pack as described in any of the above technical solutions. Since the electrical device provided by the present application includes a battery pack as described in any of the above technical solutions, both can solve the same problem and achieve the same effect.

[0088] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0089] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction (Z) and a second direction (X) intersecting each other, and the battery pack includes: A box body (10) comprises a top cover (11), a frame (12) and a bottom plate (13), wherein the top cover (11) and the bottom plate (13) are respectively connected to two sides of the frame (12) in the first direction (Z) to jointly define a receiving space (120); A bracket (30) is provided in the accommodating space (120), the bracket (30) comprising a main body (31) and a supporting portion (32), the main body (31) being supported between the top cover (11) and the bottom plate (13), and being connected to the top cover (11) and the bottom plate (13) respectively, the supporting portion (32) being connected to a side of the main body (31) facing the bottom plate (13), and being connected to the bottom plate (13), the supporting portion (32) having a first plate surface (321) facing away from the bottom plate (13); a buffer layer (40) disposed in the accommodating space (120) and connected to the first plate surface (321); A single battery (20) is disposed in the accommodating space (120), the single battery (20) comprising a shell (21), the shell (21) having a first side portion (211) facing the bottom plate (13), the first side portion (211) being connected to a side of the buffer layer (40) facing the top cover (11); Wherein, a dimension D1 mm of the main body portion (31) in the second direction (X) is smaller than a dimension D2 mm of the support portion (32) in the second direction (X).

2. The battery pack according to claim 1, wherein: The side of the main body (31) facing away from the support portion (32) is directly connected to the top cover (11); Alternatively, the shell (21) has a second side portion (212) facing the top cover (11), and the bracket (30) further includes a connecting portion (33), the connecting portion (33) is connected to at least one side of the main body (31) in the second direction (X), and the connecting portion (33) is located between the second side portion (212) and the top cover (11), and is in contact with the second side portion (212).

3. The battery pack according to claim 1, wherein: In the first direction (Z), a first gap (20a) exists between the first side portion (211) and the support portion (32), and a dimension H1mm of the first gap (20a) in the first direction (Z) satisfies: 0.2≤H1≤10.

4. The battery pack according to claim 3, characterized in that: In the first direction (Z), a second gap (20b) is provided between the bottom plate (13) and the first side portion (211) of the housing (21) of the single battery (20), and the size of the second gap (20b) in the first direction (Z) is H2 mm, and satisfies: 3≤H2≤35, and H2>H1.

5. The battery pack according to claim 1, wherein: In the second direction (X), the size of the main body (31) is D1 mm and satisfies: 0.5≤D1≤30.

6. The battery pack according to claim 5, characterized in that: The battery pack further has a third direction (Y), and the first direction (Z), the second direction (X), and the third direction (Y) are perpendicular to each other. The shell (21) includes two side walls (213) extending along the third direction (Y) and arranged opposite to each other. Two poles (22) are provided on the first side portion (211). In the second direction (X), the size of the portion of the support portion (32) supported on the buffer layer (40) is D2 mm. The size between the two side walls (213) and the poles (22) adjacent thereto is D3 mm, and the following relationship is satisfied: D2 = (0.25-1) D3.

7. The battery pack according to claim 2, characterized in that: In the second direction (X), the size of the single battery (20) is L mm, the size of the connecting portion (33) in the second direction (X) is D4 mm, and the following relationship is satisfied: 0<D4≤L / 2.

8. The battery pack according to claim 1, wherein: The battery pack further has a second direction (X), a plurality of the brackets (30) are sequentially arranged along the second direction (X), the single battery (20) is arranged between two adjacent brackets (30), and the single battery (20) is supported by the buffer layer (40) of the two adjacent brackets (30).

9. The battery pack according to claim 1, wherein: The battery pack also has a second direction (X), a plurality of the brackets (30) are spaced apart and distributed along the second direction (X), the single battery (20) is arranged between two adjacent brackets (30), and at least one of the brackets (30) simultaneously supports two adjacent single batteries (20) in the second direction (X).

10. The battery pack according to claim 1, wherein: The battery pack further has a third direction (Y), wherein the first direction (Z), the second direction (X), and the third direction (Y) are perpendicular to each other in pairs, a plurality of the single batteries (20) are arranged along the third direction (Y), and at least one of the brackets (30) simultaneously supports the plurality of the single batteries (20) arranged along the third direction (Y).

11. The battery pack according to claim 1, wherein: Also includes: A cooling assembly (50) is provided on a side of the top cover (11) facing the bottom plate (13), and / or on a side of the main body (31) facing the single battery (20).

12. The battery pack according to claim 1, wherein: The buffer layer (40) is made of a flexible material or an elastic material.

13. An electrical device, characterized in that: The invention comprises the battery pack according to any one of claims 1 to 12.

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