Battery pack and electric equipment comprising same

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery pack and electric equipment comprising the same. The battery pack comprises a frame, a first cover body, a second cover body, a supporting plate and a battery cell group, and the frame, the first cover body and the second cover body define a containing cavity; an assembling part is arranged on the inner side face of the frame, the supporting plate is connected to the assembling part in a sealed mode, the battery cell set is arranged in the containing cavity, and the supporting plate abuts against the battery cell set. According to the application, the first cover body, the second cover body and the supporting plate are respectively in sealed connection with the frame to form a multi-sealing structure, so that the sealing effect of the battery and the electric equipment is improved; the support plate is used for providing support for the battery cell group and increasing the structural strength, and after the sealing between the second cover body and the frame is invalid, a sealing interface formed by the support plate and the frame realizes the sealing of the first sub-cavity in which the battery cell group is positioned; in addition, multiple sealing planes are concentrated on the frame structure, the sealing requirement is met, the overall integration degree can be improved, and the space utilization rate is increased.

Description

Technical Field

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

[0002] As new energy vehicles gain increasing popularity, battery packs, as the power source for these vehicles, have received significant attention. Battery packs are typically located under the vehicle floor, operating in harsh conditions, especially in extreme weather and on rough roads. The external environment can severely impact the safety and reliability of the battery itself. Therefore, a sealed battery pack structure is necessary to isolate the internal components from the external environment, ensuring a stable and suitable working environment for the internal cells. Consequently, the battery pack requires excellent sealing performance to prevent external interference and damage to the battery.

[0003] In related technologies, the sealing technology for battery packs is usually achieved by setting a seal between the cover and the frame to seal and protect the battery pack. However, since it is located on the outside and is more affected by the external environment and impact, the seal is prone to failure due to its own aging, working environment and other factors over time, thus affecting the safety of the battery pack and even the whole vehicle. Utility Model Content

[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] In a first aspect, this application proposes a battery pack having a third-dimensional orientation, comprising a frame, a first cover, a second cover, a support plate, and a battery cell assembly. The frame has openings on opposite sides of its third-dimensional orientation. The first and second covers are respectively disposed on opposite sides of the frame along the third-dimensional orientation and circumferentially sealed to the openings, forming a receiving cavity with the frame, the first cover, and the second cover. The support plate connects to the frame, is located within the receiving cavity, and divides the receiving cavity into a first sub-cavity and a second sub-cavity stacked along the third-dimensional orientation. The first sub-cavity is located between the first cover and the support plate, and the second sub-cavity is located between the support plate and the second cover. The frame has a first sealing plane and a second sealing plane, the first sealing plane being sealed to the first cover, and the second sealing plane being sealed to the second cover. The frame also has an inner side facing the receiving cavity, and a mounting portion protruding from the inner side towards the receiving cavity. The mounting portion has a third sealing plane, which is connected to the support plate. The first sealing plane, the third sealing plane, and the second sealing plane are spaced apart along the third-dimensional orientation of the frame. The battery cell assembly is disposed within the first sub-cavity and supported by the support plate.

[0006] In some embodiments, a groove is provided on the first sealing plane, the groove extends along the extension direction of the first sealing plane, and a sealing element is provided in the groove, the sealing element fills the groove and abuts against the support plate.

[0007] In some embodiments, the groove has a cross-section perpendicular to its extending direction, and the cross-section is trapezoidal.

[0008] In some embodiments, the groove includes at least a first groove and a second groove, the first groove and the second groove being spaced apart along the protrusion direction of the assembly portion, and both the first groove and the second groove being provided with a sealing element.

[0009] In some embodiments, the battery pack further includes a first fastening component, and a plurality of first fastening components are provided between the first groove and the second groove, the plurality of first fastening components being spaced apart along the extension direction of the first sealing plane.

[0010] In some embodiments, the first fastening component includes a fastener and a gasket, the fastener being disposed in a third direction through the first cover and the frame, and the gasket being sleeved on the fastener and located between the first cover and the frame.

[0011] In some embodiments, the battery pack further includes a pad and a plurality of second fastening components; the pad is disposed between the second sealing plane and the second cover; the plurality of second fastening components are spaced apart along the extension direction of the second sealing plane; the second fastening components include a bolt and a nut, the nut having a wall surface perpendicular to the radial direction and a cap end disposed around the wall surface, the nut being fixedly connected to the frame, and the cap end being located between the second sealing plane and the second cover, and the pad surrounding the cap end; the bolt is threadedly connected to the nut and together with the cap end clamps the second cover.

[0012] In some embodiments, the battery pack further includes a third fastening assembly, the assembly having a weight-reducing cavity, the support plate being assembled to the assembly via the third fastening assembly, and a portion of the structure of the third fastening assembly being housed within the weight-reducing cavity.

[0013] In some embodiments, the third sealing plane has a third groove and a fourth groove, the third groove and the fourth groove extending along the extension direction of the third sealing plane, and the third groove and the fourth groove being spaced apart along the protrusion direction of the assembly portion; the third fastening component is located between the third groove and the fourth groove.

[0014] Secondly, this application proposes an electrical device that includes the battery pack of the first aspect.

[0015] The technical solution proposed in this application has at least the following technical effects:

[0016] In this application, the first cover, the second cover, and the support plate are respectively sealed to the frame to form a multi-seal structure, which improves the sealing effect of the battery pack and electrical equipment. Specifically, the support plate is used to provide support for the battery cell assembly and increase the structural strength. After the sealing interface formed by the second cover and the frame fails, the sealing interface formed by the support plate and the frame can seal the first sub-cavity where the battery cell assembly is located, ensuring the relative stability of its working environment. In addition, this application concentrates the multiple sealing planes on the frame structure, which not only meets the sealing requirements, but also improves the overall integration and increases the space utilization rate. Attached Figure Description

[0017] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.

[0018] Specifically, the annotations for the accompanying drawings are as follows:

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

[0020] Figure 2 This is a schematic diagram of the overall structure of the battery pack described in some embodiments of this application;

[0021] Figure 3 This is a partial cross-sectional schematic diagram of the box body described in some embodiments of this application;

[0022] Figure 4 This is a partial structural schematic diagram of the battery cell array described in some embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the frame structure described in some embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the structure of the first fastening assembly described in some embodiments of this application;

[0025] Figure 7 This is a partial cross-sectional schematic diagram of the side beam described in some embodiments of this application;

[0026] Figure 8 This is a schematic diagram of the structure of the second fastening assembly described in some embodiments of this application;

[0027] Figure 9 This is a schematic diagram of the structure of the third fastening component described in some embodiments of this application.

[0028] Specifically, the annotations for the figure marks in the instruction manual are as follows:

[0029] 100. Battery pack; 110. Housing; 120. Cell assembly; 121. Cell array; 1211. Cell; 111. Frame; 1111. Side beam; 1112. Assembly section; 112. First cover; 113. Second cover; 114. Support plate; H. First opening; P1. First sealing plane; P2. Second sealing plane; P3. Third sealing plane; Q. Receiving cavity; Q1. First sub-cavity; Q2. Second sub-cavity Cavity; q, weight-reducing cavity; C, groove; C1, first groove; C2, second groove; C3, third groove; C4, fourth groove; W, seal; S1, first fastening assembly; S11, fastener; S12, gasket; S2, second fastening assembly; S21, bolt; S22, nut; S211, cap end; S201, gasket; S3, third fastening assembly; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0030] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It is to be understood that the content mentioned below is only a partial embodiment of this application, while the complete list of all embodiments is provided. Therefore, other embodiments obtained based on the following embodiments without any inventive effort all fall within the protection scope of this application.

[0031] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0032] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0033] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0034] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0035] The embodiments of this application will now be described with reference to the accompanying drawings.

[0036] Firstly, referring to Figures 1 to 3 This application proposes a battery pack 100, which has a first direction X, a second direction Y, and a third direction Z that intersect each other in pairs. Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. Specifically, the battery pack 100 includes a housing 110 and a cell assembly 120. The housing 110 includes a frame 111, a first cover 112, a second cover 113, and a support plate 114. The frame 111 has a first opening H and a second opening on both sides along the third direction Z. The first cover 112 is connected to the frame 111 and covers the first opening H. The second cover 113 is connected to the frame 111 and covers the second opening. The first cover 112, the second cover 113, and the frame 111 enclose a receiving cavity Q, and the cell assembly 120 is disposed in the receiving cavity Q.

[0037] Optionally, the frame 111 includes four side beams 1111, which are connected end to end to form a square frame.

[0038] In some embodiments, refer to Figure 2 The four side beams 1111 include two opposing first side beams and two opposing second side beams, with the length of the first side beams being greater than the length of the second side beams. Correspondingly, the cell assembly 120 may include multiple rows of cell columns 121 arranged along the first direction X. Each row of cell columns 121 includes multiple cells 1211 arranged side by side along the second direction Y. Each cell 1211 has an adjacent first surface and a second surface, wherein the area of ​​the first surface is greater than the area of ​​the second surface. In particular, the first surface of all cells 1211 faces the first side beam of the frame 111, and the second surface of all cells 1211 faces the second side beam of the frame 111. This can be understood as arranging the narrow side of the frame 111 opposite the narrow surface of the cell 1211, which is a reasonable design and minimizes space waste.

[0039] In some embodiments, refer to Figure 3 and Figure 7The support plate 114 is a liquid-cooled plate; the frame 111 also includes an assembly part 1112, which is disposed on the inner sidewall of the frame 111 facing the receiving cavity Q, and the assembly part 1112 protrudes squarely towards the receiving cavity Q relative to the inner sidewall; on the third direction Z of the frame 111, the assembly part 1112 encloses to form a third opening, the axes of the first opening H, the second opening and the third opening are parallel to each other, and the area of ​​the third opening is smaller than the area of ​​the first opening H or the second opening; the support plate 114 connects the assembly part 1112 and covers the third opening, and the support plate 114 is located between the first cover 112 and the second cover 113, and divides the receiving cavity Q into a first sub-cavity Q1 and a second sub-cavity Q2 stacked along the third direction Z, wherein the first sub-cavity Q1 is located between the first cover 112 and the support plate 114, and the second sub-cavity Q2 is located between the support plate 114 and the second cover 113; the battery cell assembly 120 is disposed in the first sub-cavity Q1, and the support plate 114 abuts against the battery cell assembly 120.

[0040] Understandably, in some embodiments, the support plate 114 may only serve to support the battery cell 1211 in the third direction Z, without providing cooling or heat dissipation. In contrast, the support plate 114 is a liquid-cooled plate, which may have internal channels for fluid medium flow to absorb and transfer the heat emitted by the battery cell 1211, keeping the temperature of the battery pack 100 within a reasonable range. This integrates the support and heat dissipation structures, further improving the space utilization within the battery pack 100. It should be noted that both of the above embodiments fall within the protection scope of this application.

[0041] In some embodiments, the volume of the first sub-cavity Q1 is much larger than the volume of the second sub-cavity Q2. The battery cell assembly 120 is installed inside the first sub-cavity Q1. Optionally, the second sub-cavity Q2 can be used to provide heat dissipation for the liquid cooling plate or to house and isolate electrical components and battery pack reinforcement structures.

[0042] Specifically, the second sub-cavity Q2 serves as a protective space, which can play a secondary sealing and protection role, as well as a buffer space for bottom impact or as an exhaust channel in case of thermal runaway of the battery cell.

[0043] In some embodiments, the second cover 113 protrudes away from the battery cell assembly 120, which can increase the space and height of the second sub-cavity Q2, providing more protective space to mitigate the impact of bottom impacts, or providing greater venting space.

[0044] In summary, the first cover 112, the second cover 113, and the support plate 114 are respectively sealed to the frame 111, forming a multi-seal structure to improve the sealing effect of the battery pack 100 and the electrical equipment. Specifically, the support plate 114 is used to provide support for the cell assembly 120 and increase the structural strength. After the sealing interface formed by the second cover 113 and the frame 111 fails, the sealing interface formed by the support plate 114 and the frame 111 can seal the first sub-cavity Q1 where the cell assembly 120 is located, ensuring the relative stability of its working environment. In addition, this application concentrates the multiple sealing planes on the frame 111 structure, which not only meets the sealing requirements, but also improves the overall integration and increases the space utilization rate.

[0045] In some embodiments, refer to Figure 4 and Figure 5 The frame 111 has a first sealing plane P1, which is disposed on the side of the frame 111 facing the first cover 112 and surrounding the first opening H. The first sealing plane P1 has a groove C, which includes at least a first groove C1 and a second groove C2 that are spaced apart. The first groove C1 and the second groove C2 both surround the first opening H, and the second groove C2 is disposed on the side of the first groove C1 away from the receiving cavity Q. The first groove C1 and the second groove C2 are respectively filled with a sealing element W, and the sealing element W abuts against the first cover 112.

[0046] In some embodiments, the frame 111 further has a second sealing plane P2, which is disposed on the side of the frame 111 facing the second cover 113 and surrounding the second opening. The second sealing plane P2 may also have two grooves spaced apart, both of which surround the second opening, and each of the two grooves is filled with a sealing element W, which abuts against the second cover 113.

[0047] In some embodiments, the assembly portion 1112 has a third sealing plane P3, which is disposed on the side of the assembly portion 1112 facing the support plate 114 and surrounding the third opening. The third sealing plane P3 has two grooves spaced apart, both of which surround the third opening, and one of the two grooves is disposed on the outer periphery of the other. The two grooves are respectively filled with a sealing element W, and the sealing element W abuts against the support plate 114.

[0048] The first sealing plane P1, the third sealing plane P3, and the second sealing plane P2 are spaced apart from each other in the third direction Z.

[0049] In some embodiments, refer to Figure 9The third sealing plane P3 has a third groove C3 and a fourth groove C4. The third groove C3 and the fourth groove C4 extend along the extension direction of the third sealing plane P3, and the third groove C3 and the fourth groove C4 are spaced apart along the protrusion direction of the assembly part 1112; the third fastening component S3 is located between the third groove C3 and the fourth groove C4.

[0050] Understandably, the groove C on the sealing plane and the sealing element W within the groove C constitute a sealing structure. In some embodiments, all three sealing planes P1, P2, and P3 are provided with the above-mentioned sealing structure; or, any one of the three sealing planes P1, P2, and P3 is provided with the above-mentioned sealing structure; or, any two of the three sealing planes P1, P2, and P3 are provided with the above-mentioned sealing structure. It should be noted that all three embodiments described above fall within the protection scope of this application.

[0051] Furthermore, it should be understood that the aforementioned sealing structures may not be provided on the first sealing plane P1, the second sealing plane P2, and / or the third sealing plane P3, but may only be provided on the first cover 112, the second cover 113, and / or the support plate 114; or, the first sealing plane P1, the second sealing plane P2, and / or the third sealing plane P3, as well as the first cover 112, the second cover 113, and / or the support plate 114, may each be provided with the aforementioned sealing structures. For example, the first sealing plane P1 and the first cover 112 of the frame 111 may be provided with a first sealing structure and a second sealing structure, respectively. It should be noted that the first sealing structure and the second sealing structure may correspond to each other along the third direction Z, or they may be staggered. In particular, all of the above solutions fall within the protection scope of this application.

[0052] In some embodiments, a deformation space is reserved between the groove C on the three sealing planes and the bottom of the seal W. The seal W is assembled into the groove C and deformed by the pressure of the first cover 112, the second cover 113, or the support plate 114 to fill the deformation space. Optionally, the seal W has a cross-section perpendicular to its extension direction, and its cross-section is an inverted trapezoid. The groove C is a right-angled groove C. There is a gap between the bottom of the seal W and the sidewall of the groove C, forming a deformation space. Optionally, the material of the seal W can be rubber, graphite, nylon, plastic, etc., specifically in the form of foam or sealant.

[0053] It should be understood that the seal W is an elastic element with a certain deformation capacity, but it cannot be too loose, which would lead to seal failure. Therefore, the deformation capacity of the seal W should be moderate. Specifically, the seal W is not limited to rubber, foam, and sealant. Its cross-sectional shape can be an inverted trapezoid, a semi-circle, a semi-ellipse, etc. Correspondingly, the groove C can also be a rounded groove. As long as the inner wall of the groove C and the seal W are provided with deformation space, it is within the protection scope of this application.

[0054] In some embodiments, the groove C has a cross-section perpendicular to its extending direction, as shown in the figure. Figure 7 Its cross-section is trapezoidal, which not only facilitates the installation of the sealing element W, but also provides deformation space for the sealing element W to abut against the first cover 112.

[0055] In the above embodiment, the sealing plane of the frame 111 has a groove C for filling the sealing element W. The sealing element W abuts against the first cover 112, the second cover 113, or the support plate 114 to achieve a seal. Specifically, when the first cover 112, the second cover 113, or the support plate 114 compresses the sealing element W, the contact portion of the sealing element W with the first cover 112, the second cover 113, or the support plate 114 will first deform. Secondly, the portion of the sealing element W located in the groove C will also deform to fill the groove C. This can not only achieve an effective sealing effect, but also prevent the sealing element W from being over-compressed and / or rigidly compressed, preventing it from shrinking and losing elasticity, thereby extending the service life of the sealing element W and benefiting the long-term sealing effect of the battery and electrical equipment. In addition, the sealing plane of the frame 111 has two grooves C, each filled with the sealing element W, thereby achieving a double seal of the receiving cavity Q, further enhancing the sealing effect of the battery and electrical equipment.

[0056] Specifically, the first cover 112, the second cover 113, and the support plate 114 are respectively sealed to the frame 111 to form a multi-seal structure, which improves the sealing effect of the battery and the electrical equipment. Moreover, this application concentrates multiple sealing functions on the side beam 1111 of the frame 111, which can improve the overall integration and increase the space utilization rate while meeting the relevant sealing requirements.

[0057] In some embodiments, on the third direction Z of the frame 111, the seal W has a protrusion relative to the sealing plane. The first cover 112, the second cover 113, or the support plate 114 are assembled with the frame 111 and abut against the protrusion; optionally, the cross-section of the protrusion perpendicular to its extension direction is arc-shaped or right-angled.

[0058] In some embodiments, refer to Figure 4 and Figure 6Between two adjacent grooves C, namely between the first groove C1 and the second groove C2, a plurality of first fastening components S1 are provided at intervals along the extension direction of the first sealing plane P1. The first fastening components S1 lock the first cover 112 and the frame 111. Optionally, the first fastening component S1 includes a fastener S11 and a gasket S12. The fastener S11 passes through the first cover 112 and the frame 111 along the third direction Z, and the gasket S12 is located between the first cover 112 and the frame 111.

[0059] In some embodiments, refer to Figure 8 The battery pack 100 also includes a pad S201 and a plurality of second fastening components S2; the pad S201 is disposed between the second sealing plane P2 and the second cover 113; the plurality of second fastening components S2 are spaced apart along the extension direction of the second sealing plane P2; the second fastening components S2 include bolts S21 and nuts S22, the nuts S22 have a wall surface perpendicular to the radial direction and a cap end S211 surrounding the wall surface, the nuts S22 are fixedly connected to the frame 111, and the cap end S211 is located between the second sealing plane P2 and the second cover 113, and the pad S201 surrounds the cap end S211; the bolts S21 are threadedly connected to the nuts S22 and together with the cap end S211 clamp the second cover 113.

[0060] In some embodiments, the gasket S201 is a sealing gasket and the gasket S12 is a threaded ring, and the two have similar functions.

[0061] Optionally, refer to Figure 7 The assembly part 1112 has a weight-reducing cavity q. The support plate 114 is assembled to the assembly part 1112 by the third fastening component S3. Part of the structure of the third fastening component S3 is housed in the weight-reducing cavity q.

[0062] It should be noted that before the first cover 112, the second cover 113 or the support plate 114 are assembled with the frame 111, the sealing element W has a protruding part relative to the sealing plane; after assembly, the protruding part is flattened, causing the sealing element W to shrink into the deformation space in the groove C, so as to achieve the fit and seal between the first cover 112, the second cover 113 or the support plate 114 and the sealing plane; in particular, after the protruding part is pressed, it generally will not be lower than the sealing plane, and its lowest state is flush with the sealing plane.

[0063] In the above embodiments, the cross-sectional shape of the weight-reducing cavity q of the assembly part 1112 can be rectangular, square, trapezoidal, circular, etc. It should be noted that the weight-reducing cavity q not only reduces weight, but also accommodates the third fastening component S3, increasing space utilization; the third fastening component S3 is used to enhance the firmness of the structural connection, and can also work with the sealing element W to improve the sealing effect.

[0064] In addition, the gasket S12 of the first fastening component S1 can prevent the first cover 112 from being completely fitted with the frame 111, which would affect the sealing effect of the seal W present therebetween. If the two surfaces are already pressed together initially, the subsequent sealing effect cannot be guaranteed. By providing a certain amount of redundant space through the gasket S12, the seal W can better fill the gap under its own elasticity, forming an isolation sealing effect.

[0065] Secondly, this application proposes an electrical device that includes the battery pack 100 of the first aspect.

[0066] In the above embodiments, the power-consuming device of the second aspect includes the battery pack 100 of the first aspect. Therefore, the power-consuming device of the second aspect has at least all the technical effects of the battery pack 100 of the first aspect, and its specific technical effects will not be described in detail here.

[0067] The embodiments of this application only illustrate the structure of the electrical equipment related to the improvement points of this application in the second aspect, but it does not mean that it does not have other structures. For example, the electrical equipment also includes a battery charging and discharging protection system, a battery auxiliary heat dissipation system, etc. Other structures will not be described one by one here.

[0068] In particular, the term "and / or" in this application should be understood as follows:

[0069] In the first case, the term “and / or” located between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0070] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) the first subject and the second subject and no third subject; (5) the first subject and the third subject and no second subject; (6) the second subject and the third subject and no first subject; and (7) the first subject, the second subject and the third subject.

[0071] In addition, the character " / " in this application generally indicates that the objects before and after it are in an "or" relationship.

[0072] Furthermore, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.

Claims

1. A battery pack having a third orientation (Z), characterized in that, The device includes a frame (111), a first cover (112), a second cover (113), a support plate (114), and a battery cell assembly (120). The frame (111) has openings on both sides opposite each other along the third direction (Z). The first cover (112) and the second cover (113) are respectively disposed on both sides of the frame (111) along the third direction (Z) and are circumferentially sealed to the openings. The frame (111), the first cover (112), and the second cover (113) together form a receiving cavity (Q). The support plate (114) is located inside the receiving cavity (Q) and divides the receiving cavity (Q) into a first sub-cavity (Q1) and a second sub-cavity (Q2). The first sub-cavity (Q1) is located between the first cover (112) and the support plate (114), and the second sub-cavity (Q2) is located between the support plate (114) and the second cover (113). The frame (111) has a first sealing plane (P1) and a second sealing plane (P2). The first sealing plane (P1) is sealed to the first cover (112), and the second sealing plane (P2) is sealed to the second cover (113). The frame (111) also has an inner side facing the receiving cavity (Q). The frame (111) is provided with an assembly part (1112) that protrudes toward the receiving cavity (Q) relative to the inner side. The support plate (114) is circumferentially sealed to the assembly part (1112). The assembly part (1112) has a third sealing plane (P3). The third sealing plane (P3) is connected to the support plate (114). The first sealing plane (P1), the third sealing plane (P3), and the second sealing plane (P2) are spaced apart in the third direction (Z). The battery cell assembly (120) is disposed in the first sub-cavity (Q1) and the battery cell assembly (120) is supported on the support plate (114).

2. The battery pack according to claim 1, characterized in that, The first sealing plane (P1) is provided with a groove (C), the groove (C) extends along the extension direction of the first sealing plane (P1), and a sealing element (W) is provided in the groove (C), the sealing element (W) fills the groove (C) and abuts against the support plate (114).

3. The battery pack according to claim 2, characterized in that, The groove (C) has a cross-section perpendicular to its extension direction, and the cross-section is trapezoidal.

4. The battery pack according to claim 3, characterized in that, The groove (C) includes at least a first groove (C1) and a second groove (C2), the first groove (C1) and the second groove (C2) are spaced apart along the protrusion direction of the assembly part (1112), and the sealing element (W) is provided in both the first groove (C1) and the second groove (C2).

5. The battery pack according to claim 4, characterized in that, It also includes a first fastening component (S1), and a plurality of first fastening components (S1) are provided between the first groove (C1) and the second groove (C2), and the plurality of first fastening components (S1) are spaced apart along the extension direction of the first sealing plane (P1).

6. The battery pack according to claim 5, characterized in that, The first fastening assembly (S1) includes a fastener (S11) and a gasket (S12). The fastener (S11) passes through the first cover (112) and the frame (111) along the third direction (Z). The gasket (S12) is sleeved on the fastener (S11) and is located between the first cover (112) and the frame (111).

7. The battery pack according to claim 1, characterized in that, It also includes a gasket (S201) and a plurality of second fastening components (S2); the gasket (S201) is disposed between the second sealing plane (P2) and the second cover (113); the plurality of second fastening components (S2) are spaced apart along the extending direction of the second sealing plane (P2); The second fastening assembly (S2) includes a bolt (S21) and a nut (S22), the nut (S22) having a wall surface perpendicular to the radial direction and a cap end (S211) surrounding the wall surface, the nut (S22) being fixedly connected to the frame (111), and the cap end (S211) being located between the second sealing plane (P2) and the second cover (113), and the gasket (S201) surrounding the cap end (S211); the bolt (S21) is threadedly connected to the nut (S22) and together with the cap end (S211) clamps the second cover (113).

8. The battery pack according to claim 1 or 7, characterized in that, It also includes a third fastening assembly (S3), the assembly part (1112) has a weight-reducing cavity (q), the support plate (114) is assembled to the assembly part (1112) through the third fastening assembly (S3), and part of the structure of the third fastening assembly (S3) is housed in the weight-reducing cavity (q).

9. The battery pack according to claim 8, characterized in that, The third sealing plane (P3) has a third groove (C3) and a fourth groove (C4), the third groove (C3) and the fourth groove (C4) extending along the extension direction of the third sealing plane (P3), and the third groove (C3) and the fourth groove (C4) are spaced apart along the protrusion direction of the assembly part (1112); the third fastening component (S3) is located between the third groove (C3) and the fourth groove (C4).

10. An electrical appliance, characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 9.

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