Battery and electric equipment

Abstract

The embodiment of the utility model provides a battery and electric equipment, and the battery comprises a battery protection plate which is provided with a top surface on which components are arranged along the thickness direction of the battery protection plate; the battery cell comprises a tab, and the tab is welded on one side of the battery protection plate in the width direction of the battery protection plate; the connecting piece comprises a first connecting part and a second connecting part which are connected with each other, the first connecting part is positioned between the battery protection plate and the tab, and the first connecting part is welded with the tab; the second connecting part is provided with a welding face, the area of the welding face is larger than or equal to 2 mm < 2 >, and the welding face is welded to the top face. Therefore, the welding difficulty of the connecting piece and the battery protection plate can be reduced, the tabs are prevented from interfering with the arrangement of the components, and the component arrangement space of the circuit board is increased.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and an electrical device. Background Technology

[0002] In related technologies, nickel sheets are typically soldered to the surface of a circuit board, and then the tabs are soldered to the side of the nickel sheet away from the circuit board. However, due to the interference of the tabs, components need to be arranged to avoid the tabs, reducing the component placement space on the circuit board. Alternatively, a solution is to solder the nickel sheets to the side of the circuit board. However, soldering nickel sheets to the side of the circuit board is more difficult and prone to misalignment, leading to poor soldering between the nickel sheets and the tabs. Utility Model Content

[0003] In view of the above problems, the present invention provides a battery and electrical device that overcomes or at least partially solves the above problems.

[0004] To address the aforementioned problems, in a first aspect, this utility model discloses a battery, comprising:

[0005] A battery protection board, wherein the battery protection board has a top surface on which components are arranged along its thickness direction;

[0006] A battery cell, including tabs, said tabs being welded to one side of the battery protection board in its width direction;

[0007] The connector includes a first connecting portion and a second connecting portion that are connected to each other; the first connecting portion is located between the battery protection board and the electrode tab, and the first connecting portion is welded to the electrode tab; the second connecting portion has a welding surface, the area of ​​which is greater than or equal to 2 mm². 2 The welding surface is welded to the top surface.

[0008] Optionally, the length of the second connecting part is greater than or equal to 2 mm, and the width of the second connecting part is greater than or equal to 1 mm.

[0009] Optionally, the battery cell includes a battery cell body connected to the electrode tab;

[0010] The electrode protrudes from one end of the battery cell body;

[0011] The battery protection board is disposed between the second connection part and the cell body.

[0012] Optionally, along the width direction of the battery protection plate, the orthographic projection of the second connection portion falls within the orthographic projection of the first connection portion.

[0013] Optionally, along the length of the battery protection board, the extension length of the first connection portion is greater than the extension length of the second connection portion.

[0014] Optionally, the first connecting portion includes a first sub-connecting portion and a second sub-connecting portion that are connected to each other;

[0015] Along the thickness direction of the battery protection plate, the first sub-connection portion is located on one side of the second connection portion, and the second sub-connection portion is located on the other side of the second connection portion;

[0016] The first sub-connecting part and / or the second sub-connecting part are connected to the electrode tab.

[0017] Optionally, along the width direction of the battery protection plate, the thickness of the second sub-connector is greater than the thickness of the first sub-connector.

[0018] Optionally, the second sub-connection portion includes a reinforcing portion, and the thickness of the reinforcing portion is greater than the thickness of the first sub-connection portion along the width direction of the battery protection plate;

[0019] The second connecting portion has a first surface on the side facing the reinforcing portion, and the reinforcing portion has a second surface on the side facing the second connecting portion. The second surface and the first surface are arranged at an angle greater than or equal to 90°.

[0020] Optionally, along the length of the battery protection board, the length of the reinforcing portion is equal to or less than the length of the second connecting portion.

[0021] Optionally, the connection between the second connecting part and the first connecting part is a rounded chamfer, and the radius of the rounded chamfer is less than or equal to 0.5 mm.

[0022] Secondly, this utility model discloses an electrical device including the aforementioned battery.

[0023] The embodiments of this utility model have the following advantages:

[0024] In this embodiment of the invention, the welding surface of the second connecting part is welded to the top surface of the battery protection board, and the area of ​​the welding surface is greater than or equal to 2 mm², resulting in a larger contact area between the second connecting part and the battery protection board, stronger fit, and reduced difficulty in welding the connecting part to the battery protection board. Welding the tab to one side of the battery protection board in its width direction avoids interference with the arrangement of components on the top surface, increasing the layout space on the circuit board. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the cross-sectional structure of a battery according to this utility model;

[0026] Figure 2 This is a structural schematic diagram of a connector according to this utility model;

[0027] Figure 3 This is a schematic diagram of another connector of this utility model;

[0028] Figure 4 This is a top view of a connector of this utility model;

[0029] Figure 5 This is a bottom view of a connector according to this utility model;

[0030] Figure 6 This is a side view of a connector according to this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of a battery protection board according to this utility model;

[0032] Figure 8 This is a schematic diagram of a second connecting part welded to the top surface of the battery protection board according to this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Connector; 11. First connecting part; 111. First sub-connecting part; 112. Second sub-connecting part; 1121. Reinforcing part; 1122. Second surface; 12. Second connecting part; 121. First surface; 122. Welding surface; 14. Rounded chamfer; 2. Battery protection board; 21. Welding pad; 22. Top surface; 3. Battery cell; 31. Tab; 32. Battery cell body; 4. Components. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two 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.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In the first aspect, embodiments of this utility model disclose a battery, such as... Figure 1 As shown, the battery includes: a battery protection board 2, which has a top surface 22 along its thickness direction on which components 4 are arranged; a battery cell 3, including a tab 31, which is welded to one side of the battery protection board 2 in its width direction; and a connector 1, including a first connecting part 11 and a second connecting part 12 connected to each other; the first connecting part 11 is located between the battery protection board 2 and the tab 31, and is welded to the tab 31; the second connecting part 12 has a welding surface 122, the area of ​​which is greater than or equal to 2 mm². 2 The welding surface 122 is welded to the top surface.

[0040] In this embodiment of the invention, the welding surface 122 of the second connecting part 12 is welded to the top surface 22 of the battery protection board 2, and the area of ​​the welding surface 122 is greater than or equal to 2 mm. 2 This results in a larger contact area between the second connecting part 12 and the battery protection board 2, leading to a tighter fit and reducing the difficulty of welding the connector 1 to the battery protection board 2. Welding the tab 31 to one side of the battery protection board 2 in its width direction avoids the tab 31 interfering with the arrangement of components 4 on the top surface 22, and increases the layout space of the circuit board.

[0041] The battery described in this embodiment can be used in devices that require power, such as mobile phones and automobiles. The battery may include a cell 3 and a battery protection board 2. The cell 3 is the energy storage part of the battery, and the battery protection board 2 is an integrated circuit board that protects the battery from over-discharge, over-charge, overcurrent, and short circuit.

[0042] Specifically, the battery protection board 2 can be a printed circuit board (PCB). Components are arranged on the battery protection board 2 to form pulse code modulation (PCM). Components 4 can be resistors, capacitors, control components, etc.

[0043] Specifically, the battery protection board 2 has two perpendicular length directions, width directions, and thickness directions, such as... Figure 1 and Figure 7 As shown, the length direction is parallel to the direction of arrow S3, the width direction is parallel to the direction of arrow S2, and the thickness direction is parallel to the direction of arrow S1.

[0044] Specifically, the thickness direction of the battery protection board 2 can be consistent with the height direction of the battery, the length direction of the battery protection board 2 can be consistent with the width direction of the battery, and the width direction of the battery protection board 2 can be consistent with the thickness direction of the battery.

[0045] Furthermore, the battery cell 3 has a cell body 32 and a tab 31, with the tab 31 protruding from one end of the cell body 32. The battery protection plate 2 has two large surfaces along its thickness direction, namely a top surface 22 and a bottom surface. The bottom surface is connected to the cell body 32, and the top surface 22 is used to arrange the components 4.

[0046] Specifically, the battery further includes a connector 1, which may include a first connecting part 11 and a second connecting part 12 connected to each other. The tab 31 is located on one side of the battery protection plate 2 in its width direction. The first connecting part 11 is located between the battery protection plate 2 and the tab 31. The first connecting part 11 can be welded to the tab 31 of the cell 3. The second connecting part 12 may have a welding surface 122. The second connecting part 12 is welded to the top surface 22 of the battery protection plate 2 through the welding surface 122, so that the connector 1 can play the role of conversion, so as to realize that the tab 31 is electrically connected to the circuit board through the connector 1.

[0047] Specifically, the first connecting part 11 and the second connecting part 12 can be integrally formed to ensure the structural stability of the connector 1. In other cases, the first connecting part 11 and the second connecting part 12 can also be fixed by splicing, and this embodiment of the present invention does not specifically limit this.

[0048] Specifically, along the width direction of the battery protection plate 2, the second connecting portion 12 protrudes from the first connecting portion 11. In some embodiments, Figure 2 As shown, the second connecting portion 12 protrudes from one end of the first connecting portion 11, allowing the connector 1 to be L-shaped; in other embodiments, the second connecting portion 12 protrudes from the middle region of the first connecting portion 11, allowing the connector 1 to be T-shaped; or, as... Figures 3 to 6 As shown, the second connecting portion 12 protrudes from the central region of the first connecting portion 11, allowing the connector 1 to be nail-shaped. In this embodiment of the invention, the structure of the connector 1 is quite diverse.

[0049] Specifically, the pull-out force F = weld area A * weld strength σ. With the weld strength σ remaining constant, the larger the weld area A, the larger the pull-out force F, resulting in a tighter fit and a more stable connection. In this embodiment of the invention, the area of ​​the weld surface 122 is greater than or equal to 2 mm². 2 This can increase the pull-out force that the connector 1 and the battery protection board 2 can withstand, making the connection between the connector 1 and the battery protection board 2 more reliable.

[0050] Furthermore, such as Figure 1 and Figure 8 As shown, the welding surface 122 of the second connecting part 12 is welded to the top surface 22 of the battery protection board 2, so that the second connecting part 12 can be welded to the large surface of the battery protection board 2. This improves the convenience of placing the second connecting part 12 on the top surface 22 of the battery protection board 2. In addition, the contact area between the second connecting part 12 and the top surface 22 of the battery protection board 2 is large, which can prevent the second connecting part 12 from being skewed during welding. Furthermore, the welding process is less difficult, the welding yield is higher, and the welding cost is lower.

[0051] Specifically, the first connecting part 11 and the electrode tab 31 can be welded by spot welding or bonded by conductive adhesive, etc. This embodiment of the utility model does not make specific limitations in this regard.

[0052] Specifically, the second connecting part 12 is welded to the top surface 22 of the battery protection board 2 through the welding surface 122, so that the first connecting part 11 is located between the electrode tab 31 welding and the battery protection board 2. The first connecting part 11 can separate the battery protection board 2 and the electrode tab 31, which can prevent the electrode tab 31 from interfering with the components 4 on the top surface 22 of the battery protection board 2, protect the components 4 from being damaged, and increase the space for the components on the battery protection board 2.

[0053] Specifically, such as Figure 7As shown, pads 21 can be arranged on the top surface 22 of the battery protection board 2 to weld the welding surface 122 of the second connecting part 12. The pads 21 can be arranged on the top surface 22 of the battery protection board 2 by electroplating, or by surface treatment or other processes. This embodiment of the present invention does not specifically limit this. The distance between the pads 21 and the components 4 can be greater than or equal to 0.1 mm, so that the components 4 can be set close to the pads 21, and the space for component placement on the battery protection board 2 is relatively large.

[0054] Specifically, the surface of the first connecting portion 11 away from the second connecting portion 12 can be flat to further improve the convenience and reliability of welding the first connecting portion 11 to the tab 31. The thickness of the first connecting portion 11 along the width direction of the battery protection plate 2 can be designed according to actual needs; this embodiment of the invention does not impose specific limitations on this.

[0055] Optionally, the length of the second connecting portion 12 can be greater than or equal to 2 mm, and the width of the second connecting portion can be greater than or equal to 1 mm, so as to ensure that the surface contact of the welding surface 122 of the second connecting portion 12 is greater than or equal to 2 mm. 2 This enhances the tightness of the fit between the second connecting part 12 and the battery protection board 2.

[0056] Specifically, the thickness of the second connecting part 12 can be 2mm, 2.8mm, 3mm, 4mm, 5.5mm, etc. The second connecting parts 12 can be arranged with equal wall thickness, and the welding surface 122 of the second connecting part 12 can be a plane, so as to further improve the convenience and reliability of welding the second connecting part 12 to the top surface 22 of the battery protection board 2.

[0057] Optionally, the battery cell 3 includes a battery cell body 32 connected to the tab 31; the tab 31 protrudes from one end of the battery cell body 32; and the battery protection board 2 is disposed between the second connection portion 12 and the battery cell body 32.

[0058] In this embodiment of the utility model, the battery protection board 2 is disposed between the second connecting part 12 and the cell body 32. Since the tab 31 is welded to the first connecting part 11, the tab 31 is arranged on one side of the battery protection board 2, which can avoid the tab 31 from overlapping with the battery protection board 2, thereby giving space to the cell body 32, increasing the arrangement space of the cell body 32, and facilitating the increase of battery capacity.

[0059] Specifically, the height direction of the cell body 32 is consistent with the thickness direction of the battery protection board 2. The tab 31 can protrude from one end of the cell body 32 in its height direction. When the total length of the battery remains unchanged, and the height space occupied by the battery protection board 2 and the connector 1 is small, the arrangement space of the cell body 32 is large, which is conducive to increasing the battery capacity.

[0060] Optionally, along the width direction of the battery protection plate 2, the orthographic projection of the second connecting part 12 falls within the orthographic projection of the first connecting part 11, so that the connector 1 can be nail-shaped, which makes it easier to reduce the weight of the connector 1.

[0061] Optionally, along the length of the battery protection plate 2, the extension length of the first connecting portion 11 is greater than the extension length of the second connecting portion 12.

[0062] In this embodiment of the utility model, the first connecting part 11 has a longer extension length in the length direction of the battery protection board 2, which facilitates increasing the welding area between the first connecting part 11 and the tab 31; the second connecting part 12 has a shorter extension length in the length direction of the battery protection board 2, which can prevent the second connecting part 12 from interfering with the components 4 on the battery protection board 2.

[0063] Optionally, the first connecting portion 11 includes a first sub-connecting portion 111 and a second sub-connecting portion 112 connected to each other; along the thickness direction of the battery protection plate 2, the first sub-connecting portion 111 is located on one side of the second connecting portion 12, and the second sub-connecting portion 112 is located on the other side of the second connecting portion 12; the first sub-connecting portion 111 and / or the second sub-connecting portion 112 are connected to the tab 31.

[0064] In this embodiment of the present invention, along the thickness direction of the battery protection plate 2, the first sub-connecting part 111 is located on one side of the second connecting part 12, and the second sub-connecting part 112 is located on the other side of the second connecting part 12, so that the extension length of the first connecting part 11 in the thickness direction of the battery protection plate 2 is relatively long, which facilitates increasing the welding area between the first connecting part 11 and the tab 31 and improving the tightness of the fit between the first connecting part 11 and the tab 31.

[0065] Optionally, along the width direction of the battery protection plate 2, the thickness of the second sub-connection portion 112 is greater than the thickness of the first sub-connection portion 111, which can increase the structural strength of the second sub-connection portion 112 and improve the stability of the welding between the connector 1 and the tab 31.

[0066] Specifically, the first sub-connection part 111 can be disposed between the battery protection plate 2 and the tab 31. The first sub-connection part 111 is thin, which makes it easier to reduce the overall thickness of the battery.

[0067] Specifically, the connection between the connector 1 and the electrode 31 can be achieved by welding the second sub-connecting part 112 to the electrode 31, or by welding the second sub-connecting part 112 to the electrode 31 and the first sub-connecting part 111 to the electrode 31.

[0068] Specifically, the second sub-connecting part 112 can be arranged with equal thickness or with a locally thicker thickness. This embodiment of the present invention does not specifically limit this.

[0069] Optionally, both the first sub-connecting part 111 and the second sub-connecting part 112 are connected to the electrode tab 31, which can increase the welding area between the connector 1 and the electrode tab 31, improve the convenience of welding and fixing the connector 1 and the electrode tab 31, and improve the reliability of the fixed connection between the connector 1 and the electrode tab 31.

[0070] Optionally, the second sub-connection portion 112 includes a reinforcing portion 1121, and the thickness of the reinforcing portion 1121 is greater than the thickness of the first sub-connection portion 111 along the width direction of the battery protection plate 2; the second connection portion 12 has a first surface 121 on the side facing the reinforcing portion 1121, and the reinforcing portion 1121 has a second surface 1122 on the side facing the second connection portion 12, and the second surface 1122 is set at an angle to the first surface 121, the angle being greater than or equal to 90°.

[0071] In this embodiment of the invention, the thickness of the reinforcing part 1121 is greater than the thickness of the first sub-connecting part 111, and the reinforcing part 1121 can enhance the structural strength of the second sub-connecting part 112. The second surface 1122 is set at an angle to the first surface 121, and the angle is greater than or equal to 90°, which helps to ensure the structural strength of the connection between the second connecting part 12 and the reinforcing part 1121.

[0072] Optionally, along the length of the battery protection plate 2, the length of the reinforcing part 1121 is equal to or less than the length of the second connecting part 12, which can reduce the weight of the connector 1 while ensuring the structural strength of the second sub-connecting part 112.

[0073] Optionally, the connection between the second connecting part 12 and the first connecting part 11 is a rounded chamfer 14, and the radius of the rounded chamfer 14 is less than or equal to 0.5 mm.

[0074] In this embodiment of the invention, the connection between the second connecting part 12 and the first connecting part 11 is rounded with a chamfer 14, allowing for a smooth connection between the two parts. The radius of the chamfer 14 is less than or equal to 0.5 mm, which helps to ensure the contact area between the second connecting part 12 and the top surface 22 of the battery protection board 2, reducing the difficulty of welding the second connecting part 12 to the top surface 22 of the battery protection board 2 via the welding surface 122.

[0075] The battery described in this embodiment of the present invention has at least the following advantages:

[0076] In this embodiment of the invention, the welding surface of the second connecting portion is welded to the top surface of the battery protection board, and the area of ​​the welding surface is greater than or equal to 2 mm. 2This design results in a larger contact area between the second connecting part and the battery protection board, leading to a tighter fit and reducing the difficulty of welding the connecting part to the battery protection board. Welding the tab to one side of the battery protection board in its width direction avoids the tab interfering with the arrangement of components on the top surface, thus increasing the space available for component placement on the circuit board.

[0077] Secondly, this utility model also discloses an electrical device, including the aforementioned battery.

[0078] The electrical devices described in this embodiment include, but are not limited to, mobile phones, automobiles, etc.

[0079] The electrical equipment described in this embodiment of the present invention has at least the following advantages:

[0080] In this embodiment of the invention, the welding surface of the second connecting portion is welded to the top surface of the battery protection board, and the area of ​​the welding surface is greater than or equal to 2 mm. 2 This design results in a larger contact area between the second connecting part and the battery protection board, leading to a tighter fit and reducing the difficulty of welding the connecting part to the battery protection board. The tab is welded to one side of the battery protection board along its width, preventing the tab from interfering with the arrangement of components on the top surface and increasing the space available for component placement on the circuit board.

[0081] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0082] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device 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 terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0083] The present invention provides a detailed description of a battery and electrical device. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery, characterized by, The application relates to a battery protection plate (2) having a top surface (22) along the thickness direction of the battery protection plate (2) and arranged with components (4); a battery core (3) comprising a tab (31) welded to one side of the battery protection plate (2) in the width direction of the battery protection plate (2); and a connecting piece (1) comprising a first connecting part (11) and a second connecting part (12) connected together; the first connecting part (11) is located between the battery protection plate (2) and the tab (31) and is welded to the tab (31); the second connecting part (12) has a welding surface (122) with an area greater than or equal to 2 mm2 and is welded to the top surface (22). The length of the second connecting part (12) is greater than or equal to 2 mm, and the width of the second connecting part (12) is greater than or equal to 1 mm. The battery core (3) comprises a battery core body (32) connected to the tab (31); The tab (31) protrudes from one end of the battery core body (32); 2. The battery of claim 1, wherein, The battery protection plate (2) is arranged between the second connecting part (12) and the battery core body (32).

3. The battery of claim 1, wherein, In the width direction of the battery protection plate (2), the orthogonal projection of the second connecting part (12) falls within the orthogonal projection of the first connecting part (11). In the length direction of the battery protection plate (2), the extension length of the first connecting part (11) is greater than the extension length of the second connecting part (12). The first connecting part (11) comprises a first sub-connecting part (111) and a second sub-connecting part (112) connected together; 4. The battery of claim 1, wherein, In the thickness direction of the battery protection plate (2), the first sub-connecting part (111) is located on one side of the second connecting part (12), and the second sub-connecting part (112) is located on the other side of the second connecting part (12); 5. The battery of claim 4, wherein, The first sub-connecting part (111) and / or the second sub-connecting part (112) are connected to the tab (31).

6. The battery of claim 4, wherein, In the width direction of the battery protection plate (2), the thickness of the second sub-connecting part (112) is greater than the thickness of the first sub-connecting part (111). The second sub-connecting part (112) comprises a reinforcing part (1121) having a thickness greater than that of the first sub-connecting part (111) in the width direction of the battery protection plate (2); The second connecting part (12) has a first surface (121) on one side of the reinforcing part (1121), and the reinforcing part (1121) has a second surface (1122) on one side of the second connecting part (12); the second surface (1122) is arranged at an angle to the first surface (121), and the angle is greater than or equal to 90 degrees.

7. The battery of claim 6, wherein, In the length direction of the battery protection plate (2), the length of the reinforcing part (1121) is equal to or less than the length of the second connecting part (12).

8. The battery of claim 7, wherein, ​ ​ 9. The battery of claim 8, wherein, ​ 10. The battery of claim 1, wherein, The second connecting part (12) is circularly chamfered (14) at the connection with the first connecting part (11), the corresponding radius of the circular chamfer (14) being less than or equal to 0.5 mm.

11. An electrical device, characterized by A battery comprising any of claims 1-10.

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