Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device. The battery pack comprises a first box body, a second box body, a first fastener and a second fastener, the first fastening piece is in threaded connection with the first box body, the first fastening piece sequentially penetrates through the first box body, the second box body and the second fastening piece, the second fastening piece is in threaded connection with the first fastening piece, and the second fastening piece is arranged on the side, away from the first box body, of the second box body. According to the utility model, the detachable connection between the first box body and the second box body of the battery pack is realized through the threaded connection structure, compared with the welding technology, the space utilization rate in the battery pack is improved, and the problems of larger tolerance and assembly error caused by the influence of welding stress are avoided.

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] As the main power source for new energy vehicles, the installation and connection technology of battery packs is crucial, involving the connection between the battery pack housing, top cover, and vehicle components.

[0003] In related technologies, bolts are inserted inside the battery, and these bolts are welded to the casing; that is, the battery pack lifting points are welded and integrated into the casing. Due to the requirements of the welding process, the lifting points occupy a large space inside the casing, reducing the space utilization rate of the battery pack. Furthermore, the welding thermal stress and positioning accuracy affect the tolerances, resulting in larger assembly errors. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a battery pack and power device that can solve the problem in related technologies where welded structures occupy a large space inside the box, reducing the space utilization rate of the battery pack.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, the present invention provides a battery pack, including a first housing, a second housing, a first fastener, and a second fastener;

[0007] The first fastener is threadedly connected to the first housing body. The first fastener is sequentially inserted through the first housing body, the second housing body, and the second fastener. The second fastener is threadedly connected to the first fastener and is located on the side of the second housing body away from the first housing body.

[0008] Optionally, it also includes a seal;

[0009] The sealing element is provided between the first housing and the first fastener, and / or between the second fastener and the first fastener, and / or between the second fastener and the second housing.

[0010] Optionally, the first fastener is provided with a second mounting hole, the second mounting hole being used for the first...

[0011] Three fasteners are inserted to securely connect the battery pack to the electrical device.

[0012] Optionally, the first housing is provided with a mounting protrusion facing the second housing;

[0013] The mounting protrusion is provided with a through first mounting hole, and one end of the first fastener is threaded into the first mounting hole.

[0014] Optionally, the first fastener penetrates the first housing, and one end of the first fastener is located on the side of the first housing opposite to the second housing.

[0015] Optionally, the first fastener has a first step;

[0016] The first step abuts against the surface of the second housing facing the first housing.

[0017] Optionally, the first fastener has a second step;

[0018] The mounting protrusion has a third step inside, and the second step abuts against the third step.

[0019] Optionally, the first fastener has a fourth step;

[0020] The fourth step abuts against the surface of the first box that is away from the second box.

[0021] Optionally, the second fastener includes a connecting portion and an abutting portion;

[0022] The connecting part is connected to the side of the abutting part away from the second housing. The connecting part is provided with a first mounting groove facing the first fastener, and a first sealing element is provided in the first mounting groove. And / or the abutting part is provided with a second mounting groove facing the second housing, and a second sealing element is provided in the second mounting groove.

[0023] Optionally, the first fastener is provided with a third mounting groove, or the mounting protrusion is provided with a third mounting groove, and the third mounting groove is provided with a third sealing element.

[0024] Secondly, embodiments of the present invention provide an electrical device including the battery pack described in any of the above claims.

[0025] In the battery pack provided by this embodiment, the first fastener and the second fastener are threaded fasteners used for lifting the battery pack. The first housing and the second housing are the battery pack fixing structures. The first fastener passes through the first housing, the second housing, and the second fastener sequentially, and is threadedly connected to one of the first housing and the second housing. The first fastener and the second fastener are threadedly connected. The second fastener is sleeved on the outside of the first fastener, and under the action of the threaded connection force of the first fastener, the second fastener presses against the upper surface of the other of the first housing and the second housing. Therefore, the threaded connection structure realizes a detachable connection between the first housing and the second housing. Compared with welding technology, welding lifting points require a certain space inside the housing, while the threaded connection structure, i.e., the first fastener and the second fastener, does not occupy more space inside the housing, improving the space utilization rate inside the battery pack and avoiding the problem of large tolerances and assembly errors caused by welding stress. The positioning accuracy can be improved by adjusting the assembly of the threaded connection structure during the assembly process. In addition, this detachable connection structure facilitates the disassembly and assembly of the battery pack structure, which is beneficial for inspection and maintenance.

[0026] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of a battery pack structure provided in an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of another battery pack structure provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the second fastener structure in an embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the mounting groove structure of the second fastener in this embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the assembly of the second fastener and the seal in an embodiment of this utility model;

[0033] Figure 6 This is a schematic diagram of a first fastener structure in an embodiment of the present utility model;

[0034] Figure 7 This is a cross-sectional view of a first fastener structure in an embodiment of this utility model;

[0035] Figure 8 This is a schematic diagram of another first fastener structure in an embodiment of this utility model;

[0036] Figure 9 This is a cross-sectional view of another first fastener structure in an embodiment of this utility model;

[0037] Figure 10 This is a cross-sectional view of the bottom structure of the box in an embodiment of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1-First housing, 11-Mounting protrusion, 111-First mounting hole, 112-Third step, 12-First internal thread

[0040] 13-Third mounting groove, 2-Second housing, 3-First fastener, 301-First pipe section, 302-Second pipe section, 303-Third pipe section, 304-Fourth pipe section, 30-Second mounting hole, 31-First step, 32-Second step, 33-Fourth step, 34-First external thread, 35-Second external thread, 4-Second fastener, 401-Connecting part, 402-Abutting part, 41-First mounting groove, 42-Second mounting groove, 43-Second internal thread, 51-First seal, 52-Second seal, 53-Third seal, 6-Third fastener. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] The battery pack and power-consuming device provided by the present invention will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0044] Reference Figure 1 and Figure 2 This utility model provides a battery pack, including a first housing 1, a second housing 2, a first fastener 3 and a second fastener 4; the first fastener 3 is threadedly connected to the first housing 1, the first fastener 3 is sequentially inserted through the first housing 1, the second housing 2 and the second fastener 4, the second fastener 4 is threadedly connected to the first fastener 3, and the second fastener 4 is located on the side of the second housing 2 away from the first housing 1.

[0045] Specifically, such as Figure 1 and Figure 2 As shown, the first housing 1 and the second housing 2 are used to fix the battery pack.

[0046] The structure includes, but is not limited to, a tray, a cover, or a connecting beam. When the first housing 1 is a tray, the second housing 2 is a cover; when the first housing 1 is a cover, the second housing 2 is a tray. In this embodiment, the first housing 1 is a tray with an internal cavity for holding the battery. The second housing 2 is a cover, sealed on the upper part of the first housing 1. The first housing 1 and the second housing 2 are sealed together using a sealing ring or sealant. The first fastener 3 and the second fastener 4 are the structure for hoisting the battery pack. The first fastener 3 and the second fastener 4 are threaded fasteners. When the first fastener 3 is threadedly connected to the first housing 1, the second fastener 4 is located on the side of the second housing 2 opposite to the first housing 1; when the first fastener 3 is threadedly connected to the second housing 2, the second fastener 4 is located on the side of the first housing 1 opposite to the second housing 2. The first fastener 3 has an external thread structure, including a first external thread 34 at the lower end and a second external thread 35 at the upper end. The second fastener 4 has a second internal thread 43. The lower part of the first housing 1 has a first internal thread 12. In this embodiment, the first fastener 3 extends from the bottom of the battery pack, passing through the first housing 1, the second housing 2, and the second fastener 4 in sequence. The first external thread 34 of the first fastener 3 is threadedly engaged with the first internal thread 12 of the first housing 1 and tightened, and the second external thread 35 of the first fastener 3 is threadedly engaged with the second internal thread 43 of the second fastener 4 and tightened. The second fastener 4 is sleeved on the outside of the first fastener 3 and tightened under the action of the threaded connection force, pressing against the upper surface of the second housing 2 opposite to the first housing 1.

[0047] The battery pack provided in this embodiment of the invention achieves a detachable connection between the tray and the cover plate through a threaded connection structure. Compared to welding technology, welding lifting points require a certain amount of space inside the casing, while the threaded connection structure, namely the first and second fasteners, does not occupy additional space inside the casing, improving the space utilization rate within the battery pack. It also avoids the problem of large tolerances and assembly errors caused by welding stress, and the positioning accuracy can be improved through assembly adjustments of the threaded connection structure during assembly. Furthermore, this detachable connection structure facilitates the disassembly and assembly of the battery pack structure, which is beneficial for inspection and maintenance.

[0048] Optionally, refer to Figure 1 and Figure 2 It also includes a sealing element; the sealing element is provided between the first housing 1 and the first fastener 3, and / or between the second fastener 4 and the first fastener 3, and / or between the second fastener 4 and the second housing 2.

[0049] Specifically, such as Figure 1 and Figure 2 As shown, the threaded connection structure is sealed to the first housing 1 and the second housing 2 by a sealing element. The sealing element can be disposed at least once between the first housing 1 and the first fastener 3, between the second fastener 4 and the first fastener 3, or between the second fastener 4 and the second housing 2. In this embodiment, sealing elements are provided at all three locations. Specifically, as shown... Figure 5 As shown, a first sealing element 51 is provided between the second fastener 4 and the first fastener 3. The first sealing element 51 can be provided on the second fastener 4 or the first fastener 3. The first sealing element 51 is an annular sealing ring, which is wound around the second fastener 4 and the first fastener 3 to form a radial seal between the second fastener 4 and the first fastener 3. A second sealing element 52 is provided between the second fastener 4 and the second housing 2. The second sealing element 52 can be provided on the second fastener 4 or the second housing 2. The second sealing element 52 is an annular sealing ring, which is wound around the lower part of the second fastener 4 to form a surface seal between the second fastener 4 and the upper surface of the second housing 2. Figure 10 As shown, a third sealing element 53 is provided between the first fastener 3 and the first housing 1. The third sealing element 53 can be disposed on the first fastener 3 or inside the first housing 1. The sealing element can be an annular ring, a rectangular sealing ring, or a non-circular sealing ring. The shape of the non-circular sealing ring includes, but is not limited to, Y-shaped, V-shaped, U-shaped, X-shaped, D-shaped, triangular, or T-shaped. The material of the sealing element includes, but is not limited to, natural rubber, nitrile rubber, silicone rubber, fluororubber, graphite, or polytetrafluoroethylene. Therefore, this embodiment enhances the sealing performance between the second fastener 4 and the first fastener 3, between the second fastener 4 and the second housing 2, and between the first fastener 3 and the first housing 1 by providing multiple sealing elements.

[0050] In some embodiments, the battery pack is assembled using the following steps:

[0051] Step 1: Install the third sealing element 53 at the bottom of the first housing 1.

[0052] Step 2: Screw the first fastener 3 into the first housing 1 from the bottom of the first housing 1, so that the first external thread 34 of the first fastener 3 and the first internal thread 12 of the first housing 1 are threadedly engaged and tightened.

[0053] Step 3: Install the second box 2 on top of the first box 1, so that the first fastener 3 passes through the second box 2.

[0054] Step 4: Install the first seal 51 and the second seal 52 on the second fastener 4.

[0055] Step 5: Tighten the second fastener 4 onto the second external thread 35 on the top of the first fastener 3, and simultaneously press the second housing 2.

[0056] Optionally, refer to Figure 1 and Figure 2 The first fastener 3 is provided with a second mounting hole 30, which is used for the third fastener 6 to pass through, so that the battery pack is securely connected to the power device.

[0057] Specifically, such as Figure 1 , Figure 2 , Figure 7 and Figure 9 As shown, the first fastener 3 has a second mounting hole 30 that extends axially through it. The third fastener 6 is at least partially inserted into the second mounting hole 30. The upper part of the third fastener 6 extends out of the second mounting hole 30 and connects to the vehicle body or other electrical devices. The upper part of the third fastener 6 has external threads to strengthen the connection with the electrical devices. The third fastener 6, also known as a mounting bolt, can withstand a large tensile load and connects the battery pack to the vehicle structure.

[0058] Optionally, refer to Figure 1 and Figure 10 The first housing 1 is provided with a mounting protrusion 11 facing the second housing 2; the mounting protrusion 11 is provided with a through first mounting hole 111, and one end of the first fastener 3 is threaded into the first mounting hole 111.

[0059] Specifically, such as Figure 1 The first battery pack structure is shown, combined with Figure 10As shown, the first housing 1 is provided with a mounting protrusion 11 facing the second housing 2, meaning the mounting protrusion 11 is embedded within the first housing 1. The mounting protrusion 11 has a through first mounting hole 111, and a first internal thread 12 is provided within the first mounting hole 111. The lower end of the first fastener 3 is threaded into the first mounting hole 111, and the first external thread 34 of the first fastener 3 is threadedly engaged with the first internal thread 12 of the first housing 1 for tightening. One end of the first fastener 3 can be flush with or higher than the bottom of the first housing 1. Therefore, in this embodiment, the first fastener 3 is entirely embedded inside the first housing 1, not occupying more space at the bottom of the first housing 1, but occupying a certain amount of space inside the first housing 1, thus improving the space utilization rate of the outer side of the bottom of the first housing 1.

[0060] Optionally, refer to Figure 2 The first fastener 3 penetrates the first housing 1, and one end of the first fastener 3 is located on the side of the first housing 1 away from the second housing 2.

[0061] Specifically, such as Figure 2 The second battery pack structure is shown, in which the lower end of the first fastener 3 extends out of the first housing 1 on the side opposite to the second housing 2, i.e., the outer side of the bottom of the first housing 1. In this case, the first fastener 3 penetrates through the first housing 1, occupying a certain space on the outer side of the bottom of the first housing 1, but avoiding the occupation of the internal space of the first housing 1 and the processing of the protrusion 11, thus reducing the processing difficulty. Specifically, the...

[0062] The choice of installation structure depends on the specific circumstances.

[0063] Optionally, refer to Figure 6 and Figure 8 The first fastener 3 has a first step 31; the first step 31 abuts against the surface of the second housing 2 facing the first housing 1.

[0064] Specifically, such as Figure 6 As shown, the first fastener 3 includes a first pipe segment 301, a second pipe segment 302, and a third pipe segment 303 connected in sequence. Figure 8 As shown, the first fastener 3 includes a first pipe segment 301, a second pipe segment 302, and a fourth pipe segment 304 connected in sequence. The diameter of the first pipe segment 301 is smaller than the diameter of the second pipe segment 302. Therefore, a first step 31 is formed at the connection between the top of the second pipe segment 302 and the first pipe segment 301. During the assembly of the first fastener 3, the limiting surface of the first step 31 abuts against the lower surface of the second housing 2 to limit and fix the first fastener 3, preventing displacement and shaking of the upper end of the first fastener 3 during battery pack use, which could lead to sealing problems. Simultaneously, it accurately positions the first fastener 3, improving installation accuracy.

[0065] Optionally, refer to Figure 1 and Figure 6 The first fastener 3 has a second step 32; the mounting protrusion 11 has a third step 112 inside, and the second step 32 abuts against the third step 112.

[0066] Specifically, such as Figure 1 and Figure 6 As shown, in the first structure of the battery pack, the diameter of the second pipe segment 302 is smaller than the diameter of the third pipe segment 303, thus forming a second step 32 at the connection between the top of the third pipe segment 303 and the second pipe segment 302. A third step 112 is located inside the mounting protrusion 11. During the assembly of the first fastener 3, the limiting surface of the second step 32 abuts against the limiting surface of the third step 112 to limit and fix the first fastener 3, thereby accurately positioning the installation position of the first fastener 3 and improving installation accuracy. Furthermore, there is a chamfer transition between the second step 32 and the first external thread 34 to disperse stress and avoid excessive stress concentration. The chamfer size is determined based on the diameter of the first fastener 3 and the pitch of the first external thread 34, generally between 0.5mm and 16mm. In this embodiment, the chamfer size is larger than the pitch of the first external thread 34.

[0067] Optionally, refer to Figure 2 and Figure 8 The first fastener 3 has a fourth step 33; the fourth step 33 abuts against the surface of the first housing 1 away from the second housing 2.

[0068] Specifically, such as Figure 2 and Figure 8 As shown, in the second structure of the battery pack, the diameter of the second pipe segment 302 of the first fastener 3 is smaller than the diameter of the fourth pipe segment 304. Therefore, a fourth step 33 is formed at the connection between the top of the fourth pipe segment 304 and the second pipe segment 302. The fourth pipe segment 304 is a flange connection structure, and a limiting surface is formed on its upper part. During the assembly of the first fastener 3, the limiting surface on the upper part of the fourth pipe segment 304 abuts against the bottom of the first housing 1 to accurately position the installation position of the first fastener 3, further improving the installation accuracy.

[0069] Optionally, refer to Figures 3 to 5 The second fastener 4 includes a connecting portion 401 and an abutting portion 402; the connecting portion 401 is connected to the side of the abutting portion 402 away from the second housing 2, the connecting portion 401 is provided with a first mounting groove 41 facing the first fastener 3, a first sealing element 51 is provided in the first mounting groove 41, and / or the abutting portion 402 is provided with a second mounting groove 42 facing the second housing 2, a second sealing element 52 is provided in the second mounting groove 42.

[0070] Specifically, such as Figure 1 , Figures 3 to 5 As shown, the abutment portion 402 is disposed on the upper part of the second housing 2, and the connecting portion 401 is connected to the upper part of the abutment portion 402. A first mounting groove 41 is provided on the inner side of the connecting portion 401, and a first sealing member 51 is disposed in the first mounting groove 41, forming a radial seal between the second fastener 4 and the first fastener 3. A second mounting groove 42 is provided on the lower side of the abutment portion 402, and a second sealing member 52 is disposed in the second mounting groove 42, forming a surface seal between the second fastener 4 and the second housing 2. Both the first mounting groove 41 and the second mounting groove 42 are annular.

[0071] Optionally, refer to Figure 1 , Figure 2 and Figure 10 The first fastener 3 is provided with a third mounting groove 13, or the mounting protrusion 11 is provided with a third mounting groove 13, and the third mounting groove 13 is provided with a third sealing element 53.

[0072] Specifically, such as Figure 1 and Figure 10 As shown, in the first battery pack structure, a third mounting groove 13 is provided within the mounting protrusion 11. The third mounting groove 13 is annular, and a third sealing member 53 is embedded within the third mounting groove 13, sealingly connecting the first fastener 3 and the first housing 1, forming a radial seal between the first fastener 3 and the first housing 1. Figure 2 As shown, in the second battery pack structure, a third mounting groove 13 is provided on the flange structure at the lower part of the first fastener 3, and a third sealing member 53 is embedded in the third mounting groove 13, sealingly connecting the first fastener 3 and the first housing 1, forming a radial seal between the first fastener 3 and the first housing 1.

[0073] Specifically, such as Figures 6 to 7 As shown, in the first battery pack structure, the lower end of the first fastener 3 has an internal hexagonal socket for easy engagement with a wrench, allowing the operator to insert the wrench to tighten the studs. Figures 8 to 9 As shown, in the second battery pack structure, the lower end of the first fastener 3 has an external hexagonal mounting / unmounting position. Since the lower end of the first fastener 3 extends outside the first housing 1 in this case, the operator can tighten the bolt from the outside through the external hexagonal mounting / unmounting position. In addition, the upper part of the second fastener 4 also has an external hexagonal mounting / unmounting position, which facilitates the operator to tighten the nut through the external hexagonal mounting / unmounting position.

[0074] This utility model embodiment also provides an electrical device, including the battery pack described in any of the above embodiments, wherein the electrical device is an electric vehicle or a battery swapping station.

[0075] When the electrical device is an electric vehicle, it can improve the space utilization within the battery pack and enhance the driving performance of the electric vehicle.

[0076] 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.

[0077] 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, It includes a first housing (1), a second housing (2), a first fastener (3), and a second fastener (4); The first fastener (3) is threadedly connected to the first housing (1). The first fastener (3) is sequentially inserted into the first housing (1), the second housing (2), and the second fastener (4). The second fastener (4) is threadedly connected to the first fastener (3), and the second fastener (4) is located on the side of the second housing (2) away from the first housing (1).

2. The battery pack according to claim 1, characterized in that, It also includes seals; The sealing element is provided between the first housing (1) and the first fastener (3), and / or between the second fastener (4) and the first fastener (3), and / or between the second fastener (4) and the second housing (2).

3. The battery pack according to claim 1, characterized in that, The first fastener (3) is provided with a second mounting hole (30), which is used for the third fastener (6) to pass through so that the battery pack is securely connected to the power device.

4. The battery pack according to claim 1, characterized in that, The first housing (1) is provided with a mounting protrusion (11) facing the second housing (2); The mounting protrusion (11) is provided with a through first mounting hole (111), and one end of the first fastener (3) is threaded into the first mounting hole (111).

5. The battery pack according to claim 1, characterized in that, The first fastener (3) penetrates the first housing (1), and one end of the first fastener (3) is located on the side of the first housing (1) away from the second housing (2).

6. The battery pack according to claim 1, characterized in that, The first fastener (3) has a first step (31); The first step (31) abuts against the surface of the second box (2) facing the first box (1).

7. The battery pack according to claim 4, characterized in that, The first fastener (3) has a second step (32); The mounting protrusion (11) has a third step (112) inside, and the second step (32) abuts against the third step (112).

8. The battery pack according to claim 5, characterized in that, The first fastener (3) has a fourth step (33); The fourth step (33) abuts against the surface of the first box (1) away from the second box (2).

9. The battery pack according to claim 2, characterized in that, The second fastener (4) includes a connecting part (401) and an abutting part (402); The connecting part (401) is connected to the side of the abutting part (402) away from the second housing (2). The connecting part (401) is provided with a first mounting groove (41) facing the first fastener (3). A first sealing element (51) is provided in the first mounting groove (41). And / or the abutting part (402) is provided with a second mounting groove (42) facing the second housing (2). A second sealing element (52) is provided in the second mounting groove (42).

10. The battery pack according to claim 4, characterized in that, The first fastener (3) is provided with a third mounting groove (13), or the mounting protrusion (11) is provided with a third mounting groove (13), and the third mounting groove (13) is provided with a third sealing element (53).

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

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