Current collecting plate, battery and electric equipment

Abstract

The utility model discloses a current collecting plate, a battery and electric equipment, the current collecting plate comprises a first part, a second part and a third part, the first part is suitable for being connected with a tab of a battery cell of the battery; the second part is connected with a shell of the battery, and the second part is provided with a through hole; the first part and the second part can move relatively in the thickness direction of the flow collecting disc. The first part and the second part can relatively move in the thickness direction of the current collecting plate, the first part is flexibly connected with the battery core, and the second part is flexibly connected with the shell, so that a buffering effect can be achieved under the conditions of falling, vibration, impact and the like of the battery, the problem of connection failure between the current collecting plate and the battery core as well as between the current collecting plate and the shell is solved, and the service life of the battery is prolonged. And the connection reliability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a collecting plate, a battery and an electrical device. Background Art

[0002] At present, large cylindrical battery cells adopt a full-ear or multi-ear structure with a core winding to solve the problem of heat generation. The electrical connection is mostly connected to the outer shell through a collector plate. There are two welding methods: a hard connection between the collector plate and the core pole handle. This method is prone to falling off or cold welding in the subsequent process of the battery. There is also a penetration welding connection between the collector plate and the outer shell. This method cannot accurately determine the welding reliability and is prone to false welding or welding through. Utility Model Content

[0003] One purpose of the utility model is to provide a current collecting disk, which can solve the technical problem of the current collecting disk and the winding core pole handle falling off or poorly welded in the subsequent process of the battery in the prior art.

[0004] Another object of the present utility model is to provide a battery comprising the above-mentioned current collecting plate.

[0005] Another object of the present utility model is to provide an electrical device comprising the battery.

[0006] In order to achieve the above objectives, the utility model provides the following technical solutions.

[0007] According to the first aspect of the present invention, the current collecting plate comprises: a first part, which is suitable for connecting to the pole ear of the battery cell; a second part, which is arranged to be connected to the outer shell of the battery, and the second part is provided with a through hole; wherein, along the thickness direction of the current collecting plate, the first part and the second part are relatively movable.

[0008] Optionally, the first part and the second part are spaced apart and distributed to form a hollow gap; wherein the hollow gap is U-shaped, elongated, triangular or trapezoidal; and / or the number of the hollow gaps is not less than 3; and / or a plurality of the hollow gaps are spaced apart and distributed around the axial direction of the through hole.

[0009] Optionally, the diameter of the through hole is 0.1 times to 0.15 times the diameter of the collecting plate.

[0010] Optionally, the second portion is located at an outer edge of the collecting plate.

[0011] Optionally, the second portion is a step portion protruding from the first portion, and an outer side of the step portion is connected to an inner wall of the outer shell.

[0012] According to the battery of the embodiment of the second aspect of the utility model, the battery comprises: a shell, a receiving space is defined in the shell, and the shell has an opening connected to the receiving space; a battery cell, the battery cell is arranged in the shell; a current collecting plate, the current collecting plate is located in the receiving space, the current collecting plate is any of the current collecting plates described above, the first part is connected to the battery cell, and the second part is connected to the first area of ​​the shell; and a cover body, the cover body is arranged in the opening.

[0013] Optionally, the collecting plate is connected to the housing by laser welding.

[0014] Optionally, the inner side of the cover is connected to the second area of ​​the shell, and the first area is staggered with the second area.

[0015] Optionally, the cover body includes: a main body, the inner side of which is connected to the edge of the outer shell; a protrusion, which is arranged on the inner side of the main body and protrudes from the main body, the cross-sectional area of ​​the protrusion is smaller than the cross-sectional area of ​​the main body, and the side of the protrusion close to the battery cell abuts against the collecting plate; wherein the cover body is spaced apart from the second part.

[0016] The electrical equipment according to the third aspect of the present invention comprises any one of the above-mentioned batteries.

[0017] According to the embodiment of the utility model, a soft connection is adopted in the current collecting disk. Since the first part and the second part on the current collecting disk can move relatively, for example, the current collecting disk is provided with a hollow structure, and the welding part will play a buffering role when the winding core moves, and the welding position is not easily damaged with the displacement of the winding core. The current collecting disk, the battery cell and the casing can all be softly connected, which can avoid connection failure, improve connection stability and extend battery life.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] Figure 1 A partial exploded view of a battery according to an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of a current collecting plate according to an embodiment of the utility model at an angle;

[0022] Figure 3is a schematic diagram of a current collecting plate according to an embodiment of the utility model from another angle;

[0023] Figure 4 It is a partial cross-sectional view of a current collecting plate according to an embodiment of the utility model;

[0024] Figure 5 for Figure 4 A magnified view of the circled area A;

[0025] Figure 6 for Figure 4 A magnified view of the circled area B;

[0026] Figure 7 is a partial cross-sectional view of a cover according to an embodiment of the utility model;

[0027] Figure 8 It is a structural schematic diagram of a cover body according to an embodiment of the utility model;

[0028] Fig. 9 A partial exploded view of a battery according to an embodiment of the utility model;

[0029] Fig.10 It is a partial assembly schematic diagram according to an embodiment of the utility model;

[0030] Fig.11 It is a partial assembly schematic diagram according to an embodiment of the utility model;

[0031] Fig.12 yes Fig.11 A magnified view of the circled C region;

[0032] Fig.13 It is a partial structural schematic diagram of a battery according to an embodiment of the utility model;

[0033] Fig.14 yes Fig.13 Magnified view of the circled D region.

[0034] Reference Numbers

[0035] Battery 100;

[0036] Collecting plate 10;

[0037] Part I 11;

[0038] The second part 12; through hole 121;

[0039] Openwork gap 13;

[0040] Battery cell 20; Tab 21;

[0041] Cover 30; body 31; protrusion 32;

[0042] Housing 40; first region 41; second region 42;

[0043] Negative current collecting sheet 50 . DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0048] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] The current collecting plate 10 according to the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0050] like Figures 1 to 14 As shown, the current collecting plate 10 according to the embodiment of the utility model includes: a first part 11 and a second part 12 .

[0051] Specifically, the first part 11 is suitable for connecting with the tab 21 of the battery cell 20 of the battery 100, and the second part 12 is provided to connect with the housing 40 of the battery 100, and the second part 12 is provided with a through hole 121. In the thickness direction of the current collecting plate 10, the first part 11 and the second part 12 are relatively movable.

[0052] In other words, the current collecting plate 10 according to the embodiment of the present invention is mainly composed of a first part 11 and a second part 12, wherein the first part 11 can be connected to the tab of the battery cell 20, for example Fig.10 The second portion 12 can be connected to the housing 40, for example, as shown in the direction of arrow a by welding. Fig.12As shown, the connection is made by welding or the like in the direction of arrow b. The second part 12 is provided with a through hole 121, and the through hole 121 is provided to facilitate the electrolyte to flow into the battery cell 20, for example, into the winding core. In addition, the battery cell 20 can adopt a pole winding, etc., and the corresponding pole ear can be defined as a winding core pole handle, such as a positive pole ear handle or a negative pole ear handle, and a winding core full pole ear structure is adopted.

[0053] It should be noted that the first part 11 and the second part 12 are relatively movable along the thickness direction of the current collecting disk 10. For example, the current collecting disk 10 is a current collecting disk, and the thickness direction of the current collecting disk is the up-down direction. In this case, the first part 11 and the second part 12 can be relatively movable in the up-down direction. By setting the first part 11 and the second part 12 to be relatively movable in the thickness direction of the current collecting disk 10, it is beneficial to achieve buffering stress when the first part 11 is connected to the lug of the battery cell 20.

[0054] In addition, the current collecting disk 10 of the embodiment of the utility model can correspond to the positive electrode of the battery cell 20 or the negative electrode of the battery cell 20, which is not limited here. For the convenience of explanation, the current collecting disk 10 corresponding to the positive electrode can be defined as a positive current collecting sheet, and in the embodiment of the utility model, a soft connection is formed between the current collecting disk 10 and the battery cell 20, for example, there is a hollow gap 13 on the current collecting disk 10, and the current collecting disk 10 is softly connected to the winding core pole handle, which can play a buffering effect.

[0055] It should be noted that hard connection refers to the fact that in large cylindrical batteries or batteries with full-ear structure, no buffer structure is set when the current collector is connected to the core lug handle, resulting in the lug handle and the current collector welding part pulling the welding point with the displacement of the internal core, causing the welding point to be unreliable, thereby affecting the battery performance. However, the embodiment of the utility model adopts a soft connection. Because the first part 11 and the second part 12 on the current collector 10 can be relatively movable, for example, the current collector 10 is provided with a hollow structure, the welding part will play a buffering role when the core moves, and the welding position is not easily damaged with the displacement of the core. That is to say, in this embodiment, by adopting the first part 11 and the second part 12 to be relatively movable in the thickness direction of the current collector 10, the first part 11 is softly connected to the battery 20, and the second part 12 is softly connected to the shell 40, it can play a buffering role in the case of falling, vibration, impact, etc. of the battery 100, avoiding the problem of connection failure between the current collector 10 and the battery 20, and between the current collector 10 and the shell 40, and ensuring the reliability of the connection.

[0056] According to one embodiment of the utility model, Figure 3As shown, the first part 11 and the second part 12 are spaced apart and form a hollow gap 13. That is to say, the first part 11 and the second part 12 can be relatively movable by opening the hollow gap 13 on the collecting plate 10. For example, a through hollow gap 13 is opened along the thickness direction of the collecting plate 10, the inner area close to the center of the collecting plate 10 is the first part 11, and the outer area close to the outer edge is the second part 12. The first part 11 and the second part 12 are connected to each other, and there is a hollow gap 13 between a part of the first part 11 and the second part 12, that is, the hollow gap 13 does not exceed the outer edge of the collecting plate 10. In this embodiment, by adopting the hollow gap 13, it is easy to open, which is conducive to realizing the relative mobility of the first part 11 and the second part 12.

[0057] In some specific embodiments of the present invention, Figure 4 As shown, the hollow gap 13 is U-shaped, strip-shaped, triangular, trapezoidal, petal-shaped, etc., and is not limited to the above-mentioned scope. In this embodiment, by adopting the hollow gap 13 of the above-mentioned shape, it is convenient to open.

[0058] According to one embodiment of the utility model, Figure 4 As shown, the number of hollow gaps 13 is not less than 3, which can expand the size of the connection area between the collecting plate 10 and the pole lug, and at the same time improve the structural connection stability and connection reliability.

[0059] In some specific embodiments of the present invention, a plurality of hollow gaps 13 are distributed at intervals around the axial direction of the through hole 121. For example, the axial direction of the through hole 121 is the Z-axis direction, and the plurality of hollow gaps 13 can be distributed at intervals around the up-down direction and along the XY plane. In this embodiment, by using a plurality of hollow gaps 13 to be distributed at intervals around the axial direction of the through hole 121, it is beneficial to achieve uniformity buffering for multiple positions.

[0060] It should be noted that the hollow gaps 13 can be limited to conform to at least one of the above-mentioned shapes, quantities, distributions, etc., so as to achieve product diversification.

[0061] According to an embodiment of the utility model, the diameter of the through hole 121 is 0.1 times to 0.15 times the diameter of the current collecting plate 10, for example, 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times or 0.15 times, etc. For example, the diameter of the through hole 121 is not greater than 5 mm. By designing the diameter of the through hole 121 to be not greater than 5 mm and greater than 0 mm, for example, the diameter of the through hole 121 is 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, etc., the size of the area required for the electrolyte to flow in can be reduced, which is convenient for realizing the design of a small-sized battery cell 20. Optionally, the width of the hollow gap 13 is not less than 0.2 mm. By adopting the width of the hollow gap 13 to be not less than 0.2 mm and greater than 0 mm, for example, the width of the hollow gap 13 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., it can be flexibly set to improve the applicability to a variety of battery cells 20.

[0062] In some specific embodiments of the present invention, Figure 5 As shown, the second portion 12 is located at the outer edge of the collecting plate 10 , which can reduce the difficulty of connecting the second portion 12 and the housing 40 .

[0063] According to one embodiment of the utility model, Figure 5 As shown, the second part 12 is a step portion protruding from the first part 11, and the outer side of the step portion is arranged to be connected to the inner wall of the shell 40. For example, the first part 11 extends roughly along the XY plane, and the second part 12 extends along the Z axis. The side of the step portion close to the first part 11 is the inner side, and the side away from the first part 11 is the outer side. Among them, the connection method between the second part 12 and the inner wall of the shell 40 includes but is not limited to welding. Taking welding as an example, the outer periphery of the current collecting plate 10 can be provided with a protruding second part 12, and the outer periphery of the second part 12 can be welded to the inner wall of the shell 40, and open welding can be achieved. Among them, the open welding method can identify its welding reliability, the welding strength is high, and it is not easy to have a cold welding or desoldering phenomenon. However, in most current processes, the current collecting plate and the shell are connected by dark welding, and it is difficult to identify the internal connection of the battery cell, and it is difficult to ensure the reliability of the electrical connection. In this embodiment, by connecting the outer periphery of the step portion to the inner wall of the shell 40, it is convenient to observe the connection state between the shell 40 and the current collecting plate 10. That is to say, in this embodiment, not only can the buffered soft connection between the current collecting plate 10 and the battery cell 20 be achieved, but the current collecting plate 10 and the outer shell 40 are connected by open welding, which can effectively identify the quality of the electrical connection, avoid improper use of the battery or abnormal conditions, and ensure the reliability of the electrical connection between the current collecting plate 10 and the winding core pole handle, and between the current collecting plate 10 and the outer shell 40.

[0064] In summary, according to the current collecting plate 10 of the embodiment of the utility model, a relatively movable first part 11 and second part 12 are adopted to achieve soft connection between the current collecting plate 10 and the battery cell 20 and the outer shell 40. For example, the current collecting plate 10 is provided with a hollow structure, and the welding part will play a buffering role when the winding core moves. The welding position is not easily damaged with the displacement of the winding core, which can improve the structural reliability and extend the life of the battery 100.

[0065] like Figure 1 As shown, the utility model further provides a battery 100 , including: a housing 40 , a battery cell 20 , a current collecting plate 10 and a cover 30 .

[0066] Specifically, a receiving space is defined in the housing 40, and the housing 40 has an opening connected to the receiving space. The housing 40 can be made of aluminum, steel, or other materials. The battery cell 20 is disposed in the housing 40, and the current collecting plate 10 is located in the receiving space. The current collecting plate 10 is the current collecting plate 10 of any of the above embodiments. The first portion 11 is connected to the battery cell 20, and the second portion 12 is connected to the first area 41 of the housing 40. The cover 30 is disposed in the opening.

[0067] For example, the housing 40 extends in the Z-axis direction, an opening is provided at the bottom of the housing 40, and a battery cell 20 extending in the up-down direction is installed inside the housing 40. A current collecting plate 10 is provided below the lug of the battery cell 20. The current collecting plate 10 is a plate-shaped member. The current collecting plate 10 is provided with a hollow gap 13 along its thickness direction, i.e., the Z-axis direction. The current collecting plate 10 is a circular member. A through hole 121 is provided at the center of the current collecting plate 10. There are six hollow gaps 13. The six hollow gaps 13 are approximately located on the XY plane and are evenly distributed around the axial direction of the through hole 121. Each hollow gap 13 is a U-shaped gap, and the U-shaped opening faces the central axis direction of the through hole 121. A step portion extending downward is also provided on the outer periphery of the current collecting plate 10. The outer periphery of the step portion is connected to the inner wall of the housing 40. The step portion can be at least a part of the second part 12, that is, at least a part of the second part 12 can be defined as a step.

[0068] That is to say, the utility model also provides a battery 100. Since the current collecting plate 10 has the advantage of not easily failing in connection, and the battery 100 of the utility model embodiment includes the current collecting plate 10 of any of the above embodiments, the battery 100 of the utility model embodiment also has the same advantages and can extend the life, which will not be elaborated here.

[0069] According to one embodiment of the utility model, Fig.14As shown, the inner side of the cover 30 is connected to the second area 42 of the shell 40, and the first area 41 is staggered with the second area 42. In this embodiment, by connecting different areas of the shell 40 to the collecting plate 10 and the cover 30 respectively, the connection structure can be simplified, the operation convenience can be improved, and the structure of the collecting plate 10 and the connection position of the cover 30 and the shell 40 can be prevented from interfering with each other.

[0070] In some specific embodiments of the present invention, Fig.14 As shown, the cover 30 includes: a body 31 and a protrusion 32. The inner side of the body 31 is connected to the edge of the shell 40. The protrusion 32 is arranged on the inner side of the body 31 and protrudes from the body 31. The protrusion 32 can be defined as a boss. The cross-sectional area of ​​the protrusion 32 is smaller than the cross-sectional area of ​​the body 31. The side of the protrusion 32 close to the battery cell 20 abuts against the collector 10, for example, abuts against the upper surface of the first part 11. It should be noted that the inner side of the body 31 can be the side of the body 31 close to the battery cell 20. It should be noted that the cover 30 of this embodiment can correspond to both the positive electrode of the battery cell 20 and the negative electrode of the battery cell 20, which is not limited here. For the convenience of explanation, the cover 30 corresponding to the positive electrode can be defined as the positive electrode top cover, and the cover 30 corresponding to the negative electrode can be defined as the negative electrode top cover.

[0071] For example, the body 31 extends roughly along the XY plane, the protrusion 32 is located on the lower side of the body 31, and the lower side of the protrusion 32 abuts against the upper surface of the current collecting plate 10; the lower surface of the body 31 can also be connected to the upper edge of the shell 40. In addition, since the cross-sectional area of ​​the protrusion 32 is smaller than the cross-sectional area of ​​the body 31, that is, part of the body 51 can extend out of the protrusion 32. For example, under the projection light of the Z axis, the orthographic projection area of ​​the body 51 is larger than the orthographic projection area of ​​the protrusion 32. On the XY plane, part of the body 51 extends out of the outer peripheral surface of the protrusion 32. By making the cross-sectional area of ​​the protrusion 32 smaller than the cross-sectional area of ​​the body 31, a step gap can be formed between the body 51 and the protrusion 32. When the current collecting plate 10 with a step portion is installed, the second part 12 of the current collecting plate 10 protruding from the first part 11 can be located in the step gap, that is, the diameter of the protrusion 32 is smaller than the diameter of the annular step portion, so as to avoid the cover 30 and the second part 12 from affecting each other.

[0072] In addition, the cover body 30 is spaced apart from the second part 12. Specifically, the outer surface of the second part 12 includes a first surface, a second surface, and a third surface, the first surface is connected to the inner wall of the shell 40, the second surface is opposite to and spaced apart from the body 31, and the third surface is opposite to and spaced apart from the outer peripheral surface of the protrusion 32, so as to avoid the cover body 30 from squeezing the connection point between the second part 12 and the shell 40, and to avoid the second part 12 from squeezing the connection point between the cover body 30 and the shell 40.

[0073] Optionally, along the assembly direction of the cover 30 toward the battery cell 20 , such as the Z-axis direction, the distance between the side of the second portion 12 close to the cover 30 and the top of the housing 40 is ≥1 mm, which can effectively prevent the cover 30 from squeezing the second portion 12 .

[0074] Optionally, the collecting plate 10 and the housing 40 are connected by laser welding. Fig.12 As shown, the collector plate 10 and the housing 40 are connected by laser welding, which can be connected by multi-point laser welding or continuous laser welding, for example, along Fig.12 Laser welding is performed in the b direction to form

[0075] connect.

[0076] Optionally, during assembly, the following steps may be used:

[0077] S1, first connect the positive current collector to the winding core pole handle, then connect the negative current collector 50 to the winding core pole handle and then put it into the housing 40, and cover it with the negative electrode top cover;

[0078] S2, after the negative electrode top cover is tightly closed with the outer shell 40, the second part 12 of the positive current collector is tightly matched with the outer shell 40 and connected with the outer shell 40 by laser, and then the positive electrode top cover is tightly closed with the outer shell 40;

[0079] S3, using laser to weld and seal the positive electrode top cover and the negative electrode top cover to the outer shell 40;

[0080] S4, after liquid injection and sealing, the battery 100 is formed.

[0081] The present invention also provides an electrical device, including the battery 100 of any of the above embodiments. Since the battery 100 of the present invention has advantages such as long service life and high safety performance, the electrical device including the battery 100 of any of the above embodiments also has the same advantages, which will not be described in detail here.

[0082] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A collecting plate (10), characterized in that: include: A first part (11), the first part (11) being suitable for connecting to a tab (21) of a battery cell (20) of a battery (100); A second part (12), the second part (12) being connected to the housing (40) of the battery (100), and the second part (12) being provided with a through hole (121); Wherein, along the thickness direction of the collecting plate (10), the first part (11) and the second part (12) are relatively movable.

2. The collecting plate (10) according to claim 1, characterized in that: The first part (11) and the second part (12) are spaced apart and form a hollow gap (13); Wherein, the hollow gap (13) is U-shaped, elongated, triangular or trapezoidal; and / or, the number of the hollow gaps (13) is not less than 3; And / or, a plurality of the hollow gaps (13) are distributed and spaced apart in the axial direction of the through hole (121).

3. The collecting plate (10) according to claim 1, characterized in that: The diameter of the through hole (121) is 0.1 to 0.15 times the diameter of the collecting plate (10).

4. The collecting plate (10) according to claim 1, characterized in that: The second portion (12) is located at the outer edge of the collecting plate (10).

5. The collecting plate (10) according to claim 4, characterized in that: The second part (12) is a step portion protruding from the first part (11), and the outer side of the step portion is connected to the inner wall of the outer shell (40).

6. A battery (100), characterized in that: include: A housing (40), wherein a receiving space is defined in the housing (40), and the housing (40) has an opening communicating with the receiving space; A battery cell (20), wherein the battery cell (20) is disposed in the housing (40); A current collecting tray (10), the current collecting tray (10) being located in the receiving space, the current collecting tray (10) being the current collecting tray (10) according to any one of claims 1 to 5, the first portion (11) being connected to the battery cell (20), and the second portion (12) being connected to the first area (41) of the housing (40); A cover body (30), wherein the cover body (30) is arranged on the opening.

7. The battery (100) according to claim 6, characterized in that: The collecting plate (10) and the outer shell (40) are connected by laser welding.

8. The battery (100) according to claim 6, characterized in that: The inner side of the cover body (30) is connected to the second area (42) of the outer shell (40), and the first area (41) and the second area (42) are staggered.

9. The battery (100) according to claim 8, characterized in that: The cover body (30) comprises: A body (31), the inner side of the body (31) being connected to the edge of the shell (40); a protrusion (32), the protrusion (32) being arranged on the inner side of the body (31) and protruding from the body (31), the cross-sectional area of ​​the protrusion (32) being smaller than the cross-sectional area of ​​the body (31), and the protrusion (32) being in contact with the current collecting plate (10) on a side close to the battery cell (20); Wherein, the cover body (30) is spaced apart from the second part (12).

10. An electrical device comprising the battery (100) according to claim 9.

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