Battery pack and electric device

Abstract

The embodiment of the utility model provides a battery pack and a power utilization device, the battery pack comprises a box body, a cover plate and a mounting assembly, and the mounting assembly comprises a first fastening piece, a second fastening piece and a sealing piece; the sealing piece is arranged between the box body and the cover plate in a sealing mode, the first fastening piece is connected with the box body, and the second fastening piece is connected with the cover plate; the sealing piece is provided with a through hole, the first fastening piece comprises a first mounting part, the first mounting part is fixed in the through hole, a mounting hole is formed in the first fastening piece, the second fastening piece is in threaded connection with the hole wall of the mounting hole, and the second fastening piece extends out of the first mounting part from the end part of the mounting hole; and a buffer gap is formed between the hole wall of the through hole and the first mounting part. According to the utility model, the buffer gap is arranged between the first mounting part and the hole wall of the through hole of the sealing element, so that the expansion deformation part of the sealing element is prevented from entering a mounting interface among the first fastener, the second fastener and the cover plate, and the connection strength of the fasteners and the sealing effect of the battery pack are improved.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] With the development of new energy technologies, the sealing performance of battery packs, as the main power source, is of great importance. Battery packs have multiple exposed metal conductors that conduct electricity. To prevent moisture from entering the battery pack and causing short circuits and safety accidents, the interior of the battery pack is usually designed as a sealed cavity.

[0003] In related technologies, silicone foam is typically used to seal the battery pack, and rivet nuts are installed on the sealing interface as limit blocks.

[0004] When the sealing foam is subjected to high temperature, humid conditions or external pressure, it is prone to expansion and deformation. The deformed part enters the installation interface of the rivet nut, affecting the sealing effect of the battery pack. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide an installation component, battery pack, and power device that can solve the problem in related technologies where the sealing foam affects the sealing effect of the battery pack due to bulging and deformation.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] In a first aspect, the present invention provides a battery pack, including a housing, a cover plate, and a mounting assembly;

[0008] The mounting assembly includes a first fastener, a second fastener, and a seal;

[0009] The sealing element is disposed between the housing and the cover plate, the first fastener is connected to the housing, and the second fastener is connected to the cover plate;

[0010] The sealing element has a through hole, the first fastener includes a first mounting part, the first fastener passes through the through hole, the first mounting part is fixed in the through hole, the first fastener has a mounting hole, the second fastener is threaded to the wall of the mounting hole, and the second fastener extends out of the first mounting part from the end of the mounting hole.

[0011] A buffer gap is formed between at least a portion of the wall of the through hole and at least a portion of the first mounting portion.

[0012] Optionally, the first mounting portion is provided with a first notch to form the buffer gap.

[0013] Optionally, the first notch is located at one end of the first mounting portion near the second fastener.

[0014] Optionally, the first notch is a chamfered notch or an annular notch.

[0015] Optionally, the wall of the through hole is provided with a second notch to form a buffer gap.

[0016] Optionally, the second notch is provided circumferentially along the wall of the through hole.

[0017] Optionally, the first fastener is detachably connected to the housing.

[0018] Optionally, the first fastener further includes a second mounting portion;

[0019] The second mounting part is fixedly connected to the first mounting part, and the second mounting part is detachably connected to the housing.

[0020] Optionally, the first mounting part contacts the surface of the housing facing the seal, the second mounting part passes through the housing, and the outer diameter of the first mounting part at the contact point with the surface of the housing is larger than the outer diameter of the second mounting part.

[0021] Secondly, this utility model provides an electrical device including the battery pack described in any of the above embodiments.

[0022] The battery pack provided in this embodiment of the utility model has a sealing element disposed between the housing and the cover plate. A first fastener is connected to the housing, and a second fastener is connected to the cover plate. The first and second fasteners are threadedly connected, with the second fastener threaded into the wall of the mounting hole of the first fastener and extending out of the end of the mounting hole. A through hole is provided on the sealing element, through which the first fastener passes, and a first mounting portion of the first fastener is fixed within the through hole. A buffer gap is formed between at least a portion of the wall of the through hole and at least a portion of the first mounting portion, meaning that the wall of the through hole and the first mounting portion are not completely fitted together, and a buffer gap exists between them. This gap may be located on the wall of the through hole, and / or, this gap may be located on the first mounting portion. When the seal expands and deforms under high temperature, humid conditions, or external pressure, the deformed part enters the buffer gap. The buffer gap provides space for the expansion and deformation of the seal, preventing the expansion and deformation of the seal from entering the installation interface between the first fastener, the second fastener, and the cover plate. Therefore, it can ensure that the threaded connection structure is not affected by the expansion and deformation of the seal, and improve the connection strength between the fasteners and the sealing effect of the battery pack. Attached Figure Description

[0023] Figure 1This is an isometric schematic diagram of a partial structure of the battery pack provided in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of a first fastener structure according to an embodiment of the present utility model;

[0025] Figure 3 This is an embodiment of the present utility model. Figure 1 A cross-sectional schematic diagram;

[0026] Figure 4 This is a schematic diagram of another first fastener structure according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure in which the buffer gap is disposed on the sealing element in an embodiment of this utility model;

[0028] Figure 6 This is a partial cross-sectional view of a battery pack provided in an embodiment of the present invention;

[0029] Figure 7 This is a partial cross-sectional view of another battery pack structure provided in an embodiment of this utility model.

[0030] Figure label:

[0031] 1-First fastener, 10-Mounting hole, 11-First mounting part, 111-Sub-mounting part, 12-Second mounting part, 2-Seal, 21-Through hole, 3-Second fastener, 4-Buffer gap, 41-First notch, 42-Second notch, 51-Box body, 52-Cover plate. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0033] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] In the first embodiment, referring to Figure 1 This utility model provides a battery pack, including a housing 51, a cover plate 52, and a mounting assembly. The mounting assembly includes a first fastener 1, a second fastener 3, and a sealing element 2. The sealing element 2 is sealed between the housing 51 and the cover plate 52. The first fastener 1 is connected to the housing 51, and the second fastener 3 is connected to the cover plate 52. The sealing element 2 has a through hole 21. The first fastener 1 includes a first mounting portion 11, which passes through the through hole 21 and is fixed within the through hole 21. The first fastener 1 has a mounting hole 10, and the second fastener 3 is threadedly connected to the wall of the mounting hole 10, with the second fastener 3 extending out of the first mounting portion 11 from the end of the mounting hole 10. At least a portion of the wall of the through hole 21 and at least a portion of the first mounting portion 11 form a buffer gap 4.

[0035] Specifically, such as Figure 1 , Figure 6 and Figure 7As shown, the battery pack includes a housing 51, a cover plate 52, and mounting components. The mounting components include a first fastener 1, a second fastener 3, and a seal 2. Since there are multiple charged metal conductors inside the battery pack, to prevent external moisture from entering the battery pack and causing a short circuit and safety accident, the seal 2 is sealed between the housing 51 and the cover plate 52, forming a sealed cavity to accommodate the battery modules. The connection methods that can be used between the seal 2 and the housing 51 and cover plate 52 include, but are not limited to, adhesive fixing, mechanical fixing, or thermoforming fixing. Adhesive fixing is quick, efficient, and widely used. Mechanical fixing includes threaded connections or snap-fit ​​connections. The seal 2 has a through hole 21 for the first fastener 1 to pass through. The first fastener 1 includes a first mounting part 11, which is fixed within the through hole 21 of the seal 2, serving as an axial Z-direction limiting structure to prevent the seal 2 from being excessively compressed and failing. The lower part of the first fastener 1 is connected to the housing 51, and the connection method includes, but is not limited to, riveting or welding. The upper part of the first fastener 1, namely the first mounting part 11, is fixed in the through hole 21 of the seal 2. The second fastener 3 is threadedly connected to the first fastener 1, and the second fastener 3 is connected to the cover plate 52.

[0036] Specifically, such as Figures 2 to 4 As shown, the first fastener 1 has a mounting hole 10 extending axially along the first fastener 1, with one end open and the other end closed. The mounting hole 10 has internal threads, and the second fastener 3 has external threads. The second fastener 3 is threadedly connected to the wall of the mounting hole 10 and extends out of the opening at one end of the mounting hole 10 from the first fastener 1. The first fastener 1 and the second fastener 3 constitute a threaded fastening component, fixing the housing 51 and the cover plate 52 while simultaneously fixing the sealing element 2 between the housing 51 and the cover plate 52. The first fastener 1 can be a rivet nut, and the second fastener 3 can be a bolt. The sealing element 2 has a through hole 21, which can have one, two, or more; this embodiment is not limited here. Each through hole 21 contains one first fastener 1. The first mounting part 11 of the first fastener 1 is fixed within the through hole 21; the first mounting part 11 is the head of the rivet nut. The axial direction of the through hole 21 is parallel to the axial direction of the first fastener 1 and the mounting hole 10. A buffer gap 4 is formed between at least a portion of the wall of the through hole 21 and at least a portion of the first mounting portion 11. That is, the wall of the through hole 21 and the first mounting portion 11 are not completely fitted together, and a buffer gap 4 exists between them. This buffer gap 4 is used to provide space for the expansion and deformation of the seal 2. When the buffer gap 4 is provided on the first mounting portion 11, it is in the form of a notch, an elastic flange, a hollow structure, or a flexible structure. When the buffer gap 4 is provided on the wall of the through hole 21, it is in the form of a notch, a groove structure, or the diameter of the through hole 21 is slightly larger than the outer diameter of the first mounting portion 11; or buffer gaps 4 are provided on both the wall of the first mounting portion 11 and the wall of the through hole 21.

[0037] The sealing element 2 can be made of materials including, but not limited to, silicone rubber, EPDM rubber, polyurethane sealing cotton, foam, foamed rubber, or polytetrafluoroethylene. It is used in battery packs or other mechanical components requiring sealing and fixation. In actual use, the sealing element 2 is prone to expansion and deformation under high temperature, humid conditions, or external pressure. Especially during battery pack installation and when subjected to impacts and pressure, the sealing element 2 will be compressed, causing expansion and deformation. The expanded and deformed portion can easily enter the installation interface between the first fastener 1 or the second fastener 3 and the top cover, occupying the assembly space between the first fastener 1 and the second fastener 3. This can cause inconvenience in assembling the second fastener 3 and even lead to thread loosening, affecting the connection strength between the first fastener 1 and the second fastener 3, as well as the sealing effect of the battery pack.

[0038] In actual assembly, there is a misalignment between the through hole 21 and the first fastener 1. After the cover plate 52 is installed, the seal 2 is easily squeezed and causes expansion and deformation. The expanded and deformed part can easily enter the installation interface between the first fastener 1 and the cover plate 52, occupying the space of the installation interface, making it impossible to install the second fastener 3 properly. Furthermore, during later use, the bolts of the second fastener 3 may loosen, affecting the sealing effect of the battery pack. The battery pack provided in this embodiment of the invention provides a buffer gap between the first fastener and the through hole wall of the seal, providing space for the expansion and deformation of the seal, and preventing the expanded and deformed part of the seal from entering the installation interface between the first fastener 1, the second fastener 3, and the cover plate 52. This ensures the connection strength between the fasteners and improves the sealing effect of the battery pack. Therefore, it ensures that the bolt connection structure between the first and second fasteners is not affected by the expanded and deformed part of the seal, improving the connection strength between the fasteners and further enhancing the sealing effect of the battery pack.

[0039] In the second embodiment, refer to Figures 2 to 4 The first mounting part 11 is provided with a first notch 41 to form the buffer gap 4.

[0040] Specifically, such as Figures 2 to 4 As shown, in this embodiment, the buffer gap 4 is provided on the first mounting portion 11 of the first fastener 1, that is, the first mounting portion 11 is provided with a first notch 41 to form the buffer gap 4. The first notch 41 can adopt a structure of annular chamfered notch, such as... Figure 2 As shown, it may be a ring-shaped stepped notch, such as Figure 4As shown, it may be groove-shaped. The buffer gap 4 is located on the side wall of the first mounting part 11 and may be set along the circumference of the first fastener 1, or partially set along the circumference of the first fastener 1. When the seal 2 is subjected to high temperature conditions, humid conditions, or external force and undergoes expansion deformation, the deformed and expanded part enters the space of the first notch 41, avoiding entering the mounting interface of the first fastener 1 and affecting the installation strength of the first fastener 1. The first notch 41 can be integrally formed with the first fastener 1 by cold forging, cutting, stamping, or other machining methods that can be used by those skilled in the art. Compared with the embodiment in which the buffer gap 4 is set on the wall of the through hole 21 of the seal 2, it is easier to control the shape and size of the buffer gap 4, and the first fastener 1 formed can be reused.

[0041] Based on the second embodiment, referring to Figures 2 to 4 and Figure 6 The first notch 41 is located at one end of the first mounting portion 11 near the second fastener 3.

[0042] Specifically, such as Figure 2 and Figure 6 As shown, the first notch 41 is located at the end of the first mounting portion 11 near the second fastener 3, that is, the first notch 41 is located at the upper end of the first fastener 1 along the positive Z direction. Specifically, the first notch 41 is close to the mounting interface between the first fastener 1 and the second fastener 3. This design facilitates guiding the expanded and deformed portion of the seal 2 into the first notch 41, effectively preventing the mounting interface between the first fastener 1 and the second fastener 3 from being filled and covered by the expanded and deformed portion of the seal 2, thus affecting the connection strength between the fasteners. When the first fastener 1 includes a rivet nut and the second fastener 3 includes a bolt, the first notch 41 is located at the head of the rivet nut. The head of the rivet nut is fixed between the battery pack housing and the top cover, used to limit and fix the seal 2, ensuring that the seal 2 is not over-compressed and fails.

[0043] Based on the second embodiment, referring to Figures 2 to 4 The first notch 41 is a chamfered notch or an annular notch.

[0044] Specifically, such as Figure 2 and Figure 3 As shown, the first mounting part 11 is a variable diameter platform. The first notch 41 is an annular chamfered notch. Along the positive Z-direction towards the second fastener 3, the outer diameter of the first mounting part 11 gradually decreases to form the first notch 41. That is, the space of the first notch 41 gradually increases along the direction away from the second fastener 3, effectively accommodating the expansion and deformation of the seal 2. For example... Figure 4As shown, the first notch 41 is an annular stepped notch. The first mounting portion 11 includes at least two sub-mounting portions 111 with different outer diameters distributed along the axial direction (Z) of the first fastener 1. Along the positive Z direction, the outer diameter of the sub-mounting portions 111 gradually decreases to form an annular stepped notch. Depending on actual needs, the number of sub-mounting portions 111 can be set to two, three, or more. In this embodiment, two sub-mounting portions 111 are provided. The outer diameter of the lower sub-mounting portion 111 is larger than that of the upper sub-mounting portion 111. A first notch 41 is formed between the end face of the lower sub-mounting portion 111 and the outer wall of the upper sub-mounting portion 111 to accommodate the expansion deformation portion of the seal 2.

[0045] Based on the first embodiment, referring to Figure 5 and Figure 7 The wall of the through hole 21 is provided with a second notch 42 to form a buffer gap 4.

[0046] Specifically, such as Figure 5 and Figure 7 As shown, in this embodiment, the buffer gap 4 is provided on the wall of the through hole 21 of the seal 2, that is, a second notch 42 is provided on the wall of the through hole 21 of the seal 2 to form the buffer gap 4. Specifically, a second notch 42 is machined on the wall of the through hole 21, forming a certain angle with the hole wall, and the second notch 42 is located near the second fastener 3, so that a buffer gap is formed between the wall of the through hole of the seal 2 and the first fastener 1, accommodating the expansion and deformation of the seal 2. The second notch 42 can be provided intermittently or continuously along the circumference of the through hole 21. This design, compared to the embodiment where the buffer gap 4 is provided on the first mounting part 11, is easier to manufacture and can save on the material cost of the seal 2.

[0047] Based on the above-described second gap 42 embodiment, referring to Figure 5 and Figure 7 The second notch 42 is provided circumferentially along the wall of the through hole 21.

[0048] Specifically, such as Figure 5 and Figure 7 As shown, the second notch 42 is continuously arranged circumferentially along the wall of the through hole 21, uniformly improving the effect of expansion deformation of the seal 2 along the circumferential direction of the through hole 21. Since the seal 2 is subjected to uneven compression in various places, the uniform arrangement of the second notch 42 along the circumferential direction of the through hole 21 ensures that a buffer gap 4 can be formed between the seal 2 and the first fastener 1 at each position, while improving the stress concentration problem when the seal 2 is subjected to extrusion or impact force.

[0049] Based on any of the above embodiments, refer to Figure 6The inner diameter of the through hole 21 is D1, and the maximum outer diameter of the first mounting part 11 is D2, where D2+0.5mm≤D1≤D2+6mm.

[0050] Specifically, such as Figure 6 As shown, taking the case where the buffer gap 4 is set on the first mounting part 11 of the first fastener 1 as an example: the inner diameter of the through hole 21 is D1, and the maximum outer diameter of the first mounting part 11, i.e., the outer diameter at the mating point between the first fastener 1 and the seal 2, is D2. Taking the first fastener 1 as including a rivet nut and the seal 2 as foam as an example, generally speaking, the assembly error of the rivet nut is ±0.2mm, and the assembly error of the foam is ±0.3mm. Therefore, the assembly error between the rivet nut and the foam is ±0.5mm. Setting D1 ≥ D2 + 0.5mm is intended to absorb the assembly error between the first fastener 1 and the seal 2. However, the size of D1 should not be too large. When D1 > D2 + 0.5mm, the gap between the first fastener 1 and the seal 2 is too large. Although there is sufficient buffer gap between the first fastener 1 and the seal 2, the first fastener 1 and the seal 2 cannot fit tightly, reducing the sealing performance and increasing the space occupied by the seal 2. When assembling seal 2, the assembly error of the installation position on either side along the diameter direction of through hole 21 is ±3mm. This error is the difference between the designed position and the actual installation position of through hole 21. Therefore, the maximum possible positional fit error between the first fastener 1 and seal 2 is ±6mm, thus requiring D1≤D2+6mm.

[0051] For example, depending on the different values ​​of D2, the possible values ​​of D1 are D1 = D2 + 0.5 mm, D1 = D2 + 1 mm, D1 = D2 + 2 mm, D1 = D2 + 3 mm, D1 = D2 + 4 mm, D1 = D2 + 5 mm, or D1 = D2 + 6 mm.

[0052] Based on the first embodiment, the first fastener 1 is detachably connected to the housing 51. (Refer to...) Figure 2 and Figure 7 The first fastener 1 further includes a second mounting part 12; the second mounting part 12 is fixedly connected to the first mounting part 11, and the second mounting part 12 is detachably connected to the housing 51.

[0053] Specifically, such as Figure 2 As shown, the first fastener 1 includes a first mounting portion 11 and a second mounting portion 12 that are interconnected. The first mounting portion 11 and the second mounting portion 12 are integrally formed to form the first fastener 1. When the first fastener 1 is a rivet nut, the first mounting portion 11 is the head of the rivet nut, and the second mounting portion 12 is the body of the rivet nut. The second mounting portion 12 is inserted and fixed to the housing 51, and the first mounting portion 11 is fixed in the through hole 21 of the sealing member 2.

[0054] Based on the first embodiment, referring to Figure 2 and Figure 6 The first mounting part 11 contacts the surface of the housing 51 facing the sealing element 2, and the second mounting part 12 passes through the housing 51. The outer diameter of the first mounting part 11 at the contact point with the surface of the housing 51 is larger than the outer diameter of the second mounting part 12.

[0055] Specifically, such as Figure 2 and Figure 6 As shown, the first mounting part 11 contacts the surface of the housing 51 facing the sealing element 2, i.e., the upper surface of the housing 51 along the Z direction. The second mounting part 12 passes through the housing 51. The outer diameter of the contact point between the first mounting part 11 and the upper surface of the housing 51 is larger than the outer diameter of the second mounting part 12. That is, the outer diameter of the head of the rivet nut is larger, which facilitates the first mounting part 11 to be limited and fixed between the housing 51 and the cover plate 52.

[0056] In the third embodiment, a battery pack method is provided, the specific steps of which are as follows:

[0057] Step 1: Fix the first fastener 1 to the housing 51 by welding or riveting, so that the second mounting part 12 is fixed to the housing 51 and the first mounting part 11 is located on the upper surface of the housing 51.

[0058] Step 2: Install the sealing element 2, aligning the through hole 21 with the first mounting part 11, so that the sealing element 2 is fixed by the first fastener 1 through the through hole 21. Simultaneously, the sealing element 2 is bonded to the housing 51.

[0059] Step 3: Attach the cover plate 52 to the seal 2, and thread the second fastener 3 to the first fastener 1. Press the second fastener 3 to the cover plate 52 to fix it, thereby sealing the battery pack cavity.

[0060] In a fourth embodiment, an electrical device is also provided, comprising the battery pack described in any of the preceding embodiments.

[0061] The aforementioned electrical devices include, but are not limited to, battery swapping stations or electric vehicles. They utilize the battery packs provided in the above embodiments, which improves the sealing performance to ensure the electrical safety of the devices.

[0062] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0063] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that, Includes housing (51), cover plate (52), and mounting components; The mounting assembly includes a first fastener (1), a second fastener (3), and a seal (2); The sealing element (2) is sealed between the housing (51) and the cover plate (52), the first fastener (1) is connected to the housing (51), and the second fastener (3) is connected to the cover plate (52). The sealing element (2) has a through hole (21), the first fastener (1) includes a first mounting part (11), the first fastener (1) passes through the through hole (21), the first mounting part (11) is fixed in the through hole (21), the first fastener (1) has a mounting hole (10), the second fastener (3) is threaded to the hole wall of the mounting hole (10), and the second fastener (3) extends out of the first mounting part (11) from the end of the mounting hole (10); A buffer gap (4) is formed between at least a portion of the hole wall of the through hole (21) and at least a portion of the first mounting portion (11).

2. The battery pack according to claim 1, characterized in that, The first mounting part (11) is provided with a first notch (41) to form the buffer gap (4).

3. The battery pack according to claim 2, characterized in that, The first notch (41) is located at one end of the first mounting part (11) near the second fastener (3).

4. The battery pack according to claim 2, characterized in that, The first notch (41) is a chamfered notch or an annular notch.

5. The battery pack according to claim 1, characterized in that, The wall of the through hole (21) is provided with a second notch (42) to form a buffer gap (4).

6. The battery pack according to claim 5, characterized in that, The second notch (42) is provided circumferentially along the hole wall of the through hole (21).

7. The battery pack according to any one of claims 1 to 6, characterized in that, The first fastener (1) is detachably connected to the housing (51).

8. The battery pack according to claim 7, characterized in that, The first fastener (1) also includes a second mounting part (12); The second mounting part (12) is fixedly connected to the first mounting part (11), and the second mounting part (12) is detachably connected to the housing (51).

9. The battery pack according to claim 8, characterized in that, The first mounting part (11) contacts the surface of the housing (51) facing the seal (2), and the second mounting part (12) passes through the housing (51). The outer diameter of the first mounting part (11) at the contact point with the surface of the housing (51) is larger than the outer diameter of the second mounting part (12).

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

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