Cover plate assembly, single battery, battery pack and electric equipment

Abstract

The utility model discloses a cover plate assembly, a single battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the cover plate assembly comprises a cover plate and an anti-explosion valve, and the cover plate is provided with a pressure relief hole; the explosion-proof valve is connected with the cover plate and covers and seals the pressure relief hole, the explosion-proof valve comprises a body and a connecting part, the body is provided with a nick, the body comprises an elastic strain part, and the elastic strain part is arranged around at least part of the nick; the connecting part surrounds the body and is connected with the body; the elastic strain part is used for generating elastic deformation in the direction from the connecting part to the nick. According to the anti-explosion valve, the elastic strain part capable of generating elastic deformation is additionally arranged between the connecting part and the nick and used for compensating deformation and stretching generated by heating between the connecting part and the body when the anti-explosion valve is welded, so that the overall strength of the anti-explosion valve is improved, and the yield of the anti-explosion valve in the mounting process is improved; the safety performance of the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a cover plate assembly, a single cell, a battery pack and an electrical device. Background Art

[0002] The explosion-proof valve is a safety device for the battery. Its function is to control the gas pressure inside the battery to prevent the battery from exploding. The explosion-proof valve is usually connected to the cover plate by welding.

[0003] In current technology, since the thickness of the explosion-proof valve is relatively small, especially the thickness at the notch is even smaller, the explosion-proof valve will be deformed due to heat during the welding process, affecting the opening pressure of the explosion-proof valve, causing the explosion-proof valve to crack during the manufacturing process or fail during use. Summary of the invention

[0004] Purpose of the invention: An embodiment of the present application provides a cover plate assembly, aiming to overcome the current technical problem of welding deformation between the explosion-proof valve and the cover plate during the welding process; another purpose of the embodiment of the present application is to provide a single cell battery; another purpose of the embodiment of the present application is to provide a battery pack; another purpose of the embodiment of the present application is to provide an electrical device.

[0005] Technical solution: A cover plate assembly described in an embodiment of the present application includes:

[0006] A cover plate, wherein the cover plate has a pressure relief hole;

[0007] An explosion-proof valve, the explosion-proof valve is connected to the cover plate and covers the pressure relief hole, and the explosion-proof valve includes:

[0008] A body, the body having a notch, the body including an elastic strain portion, the elastic strain portion being disposed around at least a portion of the notch;

[0009] A connecting portion, the connecting portion is disposed around the main body and connected to the main body;

[0010] Wherein, the elastic strain portion is used to generate elastic deformation along the direction from the connecting portion to the notch.

[0011] In some embodiments, the body includes a plurality of elastic strain portions that are spaced apart from each other, and among two adjacent elastic strain portions, one elastic strain portion is disposed around the other elastic strain portion.

[0012] In some embodiments, the elastic strain portion extends in a curve or a broken line along a direction from the notch to the connecting portion.

[0013] In some embodiments, the elastic strain portion extends in an arc shape or a wavy line shape along a direction from the notch to the connecting portion.

[0014] In some embodiments, the connecting portion and the main body are an integral structure.

[0015] In some embodiments, the body further includes a main body portion, the notch is provided on the main body portion, the main body portion has a first thickness L1, and the elastic strain portion has a second thickness L2, wherein L1 is greater than or equal to L2.

[0016] In some embodiments, the elastic strain portion surrounds the notch.

[0017] The present application also provides a single cell battery, comprising the above cover plate assembly; a shell, the shell having a receiving cavity, the cover plate assembly being connected to the shell, and the cover plate assembly covering the receiving cavity.

[0018] The present application also provides a battery pack, comprising the single cell battery described above.

[0019] The present application also provides an electrical device, comprising the battery pack as described above.

[0020] Beneficial effects: The embodiment of the present application provides a cover plate assembly, which includes a cover plate and an explosion-proof valve, wherein the cover plate has a pressure relief hole; the explosion-proof valve is connected to the cover plate and seals the pressure relief hole, and the explosion-proof valve includes a body and a connecting portion, wherein the body has a notch, and the body includes an elastic strain portion, which is arranged around at least a portion of the notch; the connecting portion is arranged around the body and connected to the body; wherein the elastic strain portion is used to generate elastic deformation along the direction from the connecting portion to the notch. The present application adds an elastic strain portion that can generate elastic deformation between the connecting portion and the notch to compensate for the deformation and stretching between the connecting portion and the body caused by heat when welding the explosion-proof valve, thereby improving the overall strength of the explosion-proof valve, improving the yield of the explosion-proof valve during installation, and improving the safety performance of the battery.

[0021] The embodiment of the present application further provides a single cell battery, comprising the above-mentioned cover plate assembly. The present application improves the reliability of the single cell battery by arranging the above-mentioned cover plate assembly on the single cell battery.

[0022] The embodiment of the present application further provides a battery pack, comprising the above-mentioned single battery. The present application improves the reliability of the battery pack by arranging the above-mentioned single battery in the battery pack.

[0023] The embodiment of the present application further provides an electric device, comprising the above-mentioned battery pack. The present application improves the reliability of the electric device by arranging the above-mentioned battery pack in the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A front view of a cover assembly of an embodiment of the present application is provided;

[0026] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0027] Figure 3 A schematic diagram of the structure of an explosion-proof valve of an embodiment is provided for this application;

[0028] Figure 4 A front view of an explosion-proof valve of an embodiment is provided for this application;

[0029] Figure 5 For an embodiment of this application Figure 4 Sectional view at the middle BB;

[0030] Figure 6 Another embodiment of the present application is Figure 4 Sectional view at the middle BB;

[0031] Figure 7 For an embodiment of this application Figure 5 Enlarged view of the center circle C;

[0032] Figure 8 Another embodiment of the present application is Figure 6 Enlarged view of the middle circle D;

[0033] Figure numerals: 10 - explosion-proof valve, 11 - main body, 111 - notch, 112 - elastic strain part, 113 - main body, 12 - connecting part, 20 - cover plate, 21 - pressure relief hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0036] The explosion-proof valve 10 is a safety device of the battery. The function of the explosion-proof valve 10 is to control the gas pressure inside the battery. When the gas pressure inside the battery is too high, the explosion-proof valve 10 will automatically open to release excess gas to ensure that the battery remains within a safe pressure range. This can effectively reduce the risk of battery explosion, improve the safety of use, and prevent battery explosion. The explosion-proof valve 10 is usually connected to the cover plate 20 by welding.

[0037] In the current technology, since the thickness of the explosion-proof valve 10 is relatively small, especially the thickness at the notch 111 is even smaller, the explosion-proof valve 10 will produce welding deformation due to heat during the welding process, affecting the opening pressure of the explosion-proof valve 10, causing the explosion-proof valve 10 to crack during the manufacturing process or fail during use.

[0038] It should be noted that, in the embodiment of the present application, the explosion-proof valve 10 can be connected to the cover plate 20 by welding, can be connected to the side wall of the shell by welding, and can be connected to the bottom wall of the shell by welding.

[0039] In order to solve the technical problem of welding deformation of the explosion-proof valve 10 in the current technology, the first embodiment of the present application provides a cover plate assembly. Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 The front view of the cover assembly of the embodiment provided in this application, Figure 2 for Figure 1 The cross-sectional view at AA in the middle. Figure 3 The present application provides a schematic structural diagram of an explosion-proof valve 10 according to an embodiment. Figure 4The present application provides a front view of an explosion-proof valve 10 of an embodiment. The cover plate assembly includes a cover plate 20 and an explosion-proof valve 10, the cover plate 20 has a pressure relief hole 21; the explosion-proof valve 10 is connected to the cover plate 20 and seals the pressure relief hole 21, the explosion-proof valve 10 includes a body 11 and a connecting portion 12, the body 11 has a notch 111, the body 11 includes an elastic strain portion 112, the elastic strain portion 112 is arranged around at least a portion of the notch 111; the connecting portion 12 is arranged around the body 11 and is connected to the body 11; wherein the elastic strain portion 112 is used to generate elastic deformation along the direction from the connecting portion 12 to the notch 111.

[0040] Specifically, in some embodiments, the elastic strain portion 112 may be arranged around the notch 111 to avoid welding deformation in all directions between the notch 111 and the connecting portion 12; and in other embodiments, the elastic strain portion 112 may be located between part of the notch 111 and part of the connecting portion 12 to protect only some directions where welding deformation is more likely to occur.

[0041] In the first embodiment, when the explosion-proof valve 10 is specifically applied to a battery and used as a safety device for the battery, an elastic strain portion 112 is provided between the connecting portion 12 and the notch 111. The elastic strain portion 112 can be elastically deformed when the connecting portion 12 or the main body 11 is deformed due to welding to avoid welding deformation of the explosion-proof valve 10, thereby releasing the generated stress, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, and avoiding the explosion-proof valve 10 from cracking due to stress concentration during the welding process or failure during use.

[0042] Please refer again Figure 3 and Figure 4 , the explosion-proof valve 10 provided in an embodiment of the present application is described in detail.

[0043] In some embodiments, the explosion-proof valve 10 includes a main body 11 and a connecting portion 12, the main body 11 has a notch 111, the main body 11 includes an elastic strain portion 112, and the elastic strain portion 112 is arranged around at least a portion of the notch 111; the connecting portion 12 is arranged around the main body 11 and is connected to the main body 11; wherein the elastic strain portion 112 is used to generate elastic deformation along the direction from the connecting portion 12 to the notch 111.

[0044] Through the above manner, compared with the explosion-proof valve 10 in the prior art, when the explosion-proof valve 10 is welded, the connecting portion 12 and the main body 11 are relatively thin, and local stress concentration is easily generated when heated, resulting in cracks in the main body 11 itself or between the main body 11 and the connecting portion 12, or the explosion-proof valve 10 fails during use. The explosion-proof valve 10 in this embodiment is provided with an elastic strain portion 112 between the connecting portion 12 and the main body 11 to convert the stress generated by the connecting portion 12 and the main body 11 due to heat during welding into elastic deformation of the elastic strain portion 112, thereby avoiding cracks in the main body 11 or at the connection between the main body 11 and the connecting portion 12 due to the generated local stress concentration, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, and avoiding the explosion-proof valve 10 from cracking due to stress concentration during welding or failing during use.

[0045] In some embodiments, the body 11 includes a plurality of elastic strain portions 112 disposed at intervals, and one of two adjacent elastic strain portions 112 is disposed around the other elastic strain portion 112. Specifically, one of the two adjacent elastic strain portions 112 is closer to the connecting portion 12, and the other is closer to the body 11.

[0046] Furthermore, the shapes of the multiple elastic strain portions 112 in the direction perpendicular to the cover plate are the same, and the shape of one of the two adjacent elastic strain portions 112 in the direction perpendicular to the cover plate is obtained by enlarging or reducing the shape of the other in the direction perpendicular to the cover plate. Specifically, the shapes of the multiple elastic strain portions 112 in the direction perpendicular to the cover plate are all runway-shaped, elliptical, etc.

[0047] In order to make the reliability of the elastic strain part 112 higher, the shape of the elastic strain part 112 in the direction perpendicular to the cover plate should avoid having sharp edges and corners. On the contrary, the shape of the elastic strain part 112 in the direction perpendicular to the cover plate should be rounded at the corners to avoid stress concentration at the corners and cause failure of the elastic strain part 112.

[0048] By providing a plurality of elastic strain portions 112 as described above, the range of welding deformation that the explosion-proof valve 10 can accept can be expanded, so as to further improve the yield rate of the explosion-proof valve 10 during installation.

[0049] In some other embodiments, among two adjacent elastic strain portions 112 , one elastic strain portion 112 surrounds a portion of the other elastic strain portion 112 .

[0050] Specifically, one elastic strain portion 112 surrounds a portion of another elastic strain portion 112 to increase the degree of elastic deformation in the direction corresponding to the portion of the other elastic strain portion 112, and then the elastic strain portions 112 are superimposed in a targeted manner, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment and preventing the explosion-proof valve 10 from cracking due to stress concentration during welding or failing during use.

[0051] In some embodiments, see Figure 5 , Figure 6 , Figure 7 and Figure 8 ,in, Figure 5 For an embodiment of this application Figure 4 The cross-sectional view at AA in the middle. Figure 6 Another embodiment of the present application is Figure 4 The cross-sectional view at AA in the middle. Figure 7 For an embodiment of this application Figure 5 The enlarged image of the middle circle B, Figure 8 Another embodiment of the present application is Figure 6 In the enlarged view of the middle circle C, the elastic strain portion 112 extends in a curve or a broken line along the direction from the notch 111 to the connecting portion 12 .

[0052] The broken line is formed by connecting multiple line segments in sequence, and the angle between adjacent line segments is not equal to 180°.

[0053] Specifically, the elastic strain portion 112 extends along a trajectory, which is a curve or a broken line from the notch 111 to the connecting portion 12 .

[0054] Further, the body 11 has an upper surface and a lower surface. In some embodiments, please participate in Figure 7 , the elastic strain portions 112 are all located on the side of the lower surface close to the upper surface; in other embodiments, the elastic strain portions 112 are all located on the side of the upper surface close to the lower surface; in other embodiments, some parts of the elastic strain portions 112 are located on the side of the lower surface close to the upper surface, and other parts are located on the side of the upper surface close to the lower surface.

[0055] If the heat source is closer to the lower surface during welding, the most preferred solution is that the elastic strain portions 112 closest to the connection portion are all located on the side of the lower surface close to the upper surface.

[0056] If the heat source is closer to the upper surface during welding, it is the best solution that the elastic strain portion 112 closest to the connection portion is located on the side of the upper surface close to the lower surface.

[0057] In the above optimal solution, the side of the elastic strain portion 112 close to the heat source is more likely to produce elastic deformation, thereby making it easier to offset welding deformation, so that the elastic strain portion 112 has a better effect, further improving the overall strength of the explosion-proof valve 10 in the embodiment, and preventing the explosion-proof valve 10 from cracking due to stress concentration during welding or failing during use.

[0058] In the above embodiment, the elastic strain portion 112 fluctuates up and down between the notch 111 and the connecting portion 12, thereby obtaining an elastic deformation space in the direction from the notch 111 to the connecting portion 12, so that the elastic strain portion 112 can compensate for the welding deformation between the body 11 and the connecting portion 12, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, and preventing the explosion-proof valve 10 from cracking due to stress concentration during the welding process or failing during use.

[0059] In some embodiments, there are multiple elastic strain portions 112 , and the extension trajectories of adjacent elastic strain portions 112 are the same; in other embodiments, there are multiple elastic strain portions 112 , and the extension trajectories of adjacent elastic strain portions 112 are different.

[0060] In some embodiments, see Figure 7 and Figure 8 The elastic strain portion 112 extends in an arc shape or a wave shape along the direction from the notch 111 to the connecting portion 12 .

[0061] Compared with the elastic strain portion 112 obtained by extending in a zigzag shape, the elastic strain portion 112 obtained by extending in an arc shape or a wave shape has no edges and corners, and will transition through a circular arc surface when the extension direction changes, which can further reduce the possibility of stress concentration, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, and preventing the explosion-proof valve 10 from cracking due to stress concentration during welding or failing during use.

[0062] In some embodiments, please refer again to Figure 7 and Figure 8 The connecting portion 12 and the main body 11 are an integrated structure.

[0063] By configuring the connecting portion 12 and the main body 11 as an integrated structure, there are no other mechanical weak points between the connecting portion 12 and the main body 11 except the elastic strain portion 112, thereby avoiding the tensile deformation generated during welding that causes a break between the connecting portion 12 and the main body 11 and only causing the elastic strain to produce elastic deformation, thereby improving the overall strength of the explosion-proof valve 10 in this embodiment, and avoiding the explosion-proof valve 10 from cracking due to stress concentration during the welding process or failure during use.

[0064] In some embodiments, see Figure 7 and Figure 8The body 11 further includes a main body portion 113 , the notch 111 is disposed on the main body portion 113 , the main body portion 113 has a first thickness L1 , and the elastic strain portion 112 has a second thickness L2 , wherein L1 is greater than or equal to L2 .

[0065] Specifically, the first thickness L1 of the main body 113 is the thickness of the main body 113 at a location other than the notch 111 , and the second thickness L2 of the elastic strain portion 112 is the thickness in a direction perpendicular to the extension track of the elastic strain portion 112 .

[0066] In this embodiment, the elastic strain portion 112 is a mechanically weak point compared to the main body 11, so the deformation and stretching generated at the main body 11 during the welding process can be compensated by the elastic deformation of the elastic strain portion 112, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, and preventing the explosion-proof valve 10 from cracking due to stress concentration during the welding process or failing during use.

[0067] Further, in some embodiments, please refer again to Figure 3 and Figure 4 The elastic strain portion 112 is arranged to surround the notch 111 .

[0068] Specifically, the elastic strain portion 112 is arranged around the notch 111 to avoid the possibility of welding deformation between the main body 11 and the connecting portion 12 in any direction when the explosion-proof valve 10 is welded, thereby improving the overall strength of the explosion-proof valve 10 in this embodiment and preventing the explosion-proof valve 10 from cracking due to stress concentration during welding or failing during use.

[0069] Correspondingly, the present application also provides a single cell battery, comprising the above cover plate assembly.

[0070] In the above embodiment, by providing an elastic strain portion 112 between the connecting portion 12 and the notch 111, the elastic strain portion 112 can generate elastic deformation when the connecting portion 12 or the main body 11 is welded to the cover plate 20 to avoid welding deformation of the explosion-proof valve 10, thereby releasing the generated stress, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, avoiding the explosion-proof valve 10 from cracking due to stress concentration during the welding process or failure during use, thereby improving the reliability of the cover plate assembly and even the single battery.

[0071] Correspondingly, the present application also provides a battery pack, comprising the above single cell battery.

[0072] In some embodiments, a battery pack includes a single cell, the single cell includes a shell, the shell has a accommodating cavity, the shell includes side walls and a bottom wall, the side walls and the bottom wall are arranged to form the accommodating cavity, the explosion-proof valve 10 is arranged on the side wall or the bottom wall, the explosion-proof valve 10 includes a main body 11 and a connecting portion 12, the main body 11 has a notch 111, the main body 11 includes an elastic strain portion 112, the elastic strain portion 112 is arranged around at least a portion of the notch 111; the connecting portion 12 is arranged around the main body 11 and is connected to the main body 11; wherein the elastic strain portion 112 is used to generate elastic deformation along the direction from the connecting portion 12 to the notch 111.

[0073] In other embodiments, the battery pack includes a single cell, the single cell includes a cover assembly, the cover assembly includes an explosion-proof valve 10, the explosion-proof valve 10 includes a main body 11 and a connecting portion 12, the main body 11 has a notch 111, the main body 11 includes an elastic strain portion 112, the elastic strain portion 112 is arranged around at least a portion of the notch 111; the connecting portion 12 is arranged around the main body 11 and is connected to the main body 11; wherein the elastic strain portion 112 is used to generate elastic deformation along the direction from the connecting portion 12 to the notch 111.

[0074] In the above embodiment, by providing an elastic strain portion 112 between the connecting portion 12 and the notch 111, the elastic strain portion 112 can generate elastic deformation when the connecting portion 12 or the main body 11 is welded to the cover plate 20 to avoid welding deformation of the explosion-proof valve 10, thereby releasing the generated stress, thereby improving the overall strength of the explosion-proof valve 10 in the embodiment, avoiding cracking of the explosion-proof valve 10 due to stress concentration during the welding process or failure during use, thereby improving the reliability of the battery pack.

[0075] Correspondingly, the present application also provides an electrical device, including the battery pack as above.

[0076] In some embodiments, the present application provides an electrical device, which includes the above-mentioned single battery. The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0077] In the above embodiment, the above battery pack is provided in the electrical equipment to improve the reliability of the electrical equipment.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The cover plate assembly, single cell, battery pack and electrical equipment provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein the cover plate has a pressure relief hole; An explosion-proof valve, the explosion-proof valve is connected to the cover plate and covers the pressure relief hole, and the explosion-proof valve includes: A body, the body having a notch, the body including an elastic strain portion, the elastic strain portion being disposed around at least a portion of the notch; A connecting portion, the connecting portion is disposed around the main body and connected to the main body; Wherein, the elastic strain portion is used to generate elastic deformation along the direction from the connecting portion to the notch.

2. The cover plate assembly according to claim 1, characterized in that: The main body includes a plurality of elastic strain portions that are spaced apart from each other, and one of two adjacent elastic strain portions is disposed around the other elastic strain portion.

3. The cover plate assembly according to claim 1, characterized in that: The elastic strain portion extends in a curve or a broken line along a direction from the notch to the connecting portion.

4. The cover plate assembly according to claim 3, characterized in that: The elastic strain portion extends in an arc shape or a wave shape along a direction from the notch to the connecting portion.

5. The cover plate assembly according to claim 1, characterized in that: The connecting portion and the main body are an integrated structure.

6. The cover plate assembly according to claim 1, characterized in that: The main body further includes a main body portion, the notch is disposed on the main body portion, the main body portion has a first thickness L1, and the elastic strain portion has a second thickness L2, wherein L1 is greater than or equal to L2.

7. The cover plate assembly according to claim 1, characterized in that: The elastic strain portion is arranged to surround the notch.

8. A single cell battery, characterized in that: include: The cover plate assembly according to any one of claims 1 to 7; The shell has a receiving cavity, the cover assembly is connected to the shell, and the cover assembly covers the receiving cavity.

9. A battery pack, characterized in that: Comprising a single battery as claimed in claim 8.

10. An electrical device, characterized in that: Comprising a battery pack as claimed in claim 9.

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