Laminated battery cell, battery and power utilization device

Abstract

The utility model discloses a laminated cell, battery and power utilization device, including: stack core and aluminum plastic film, stack core is located in the aluminum plastic film, aluminum plastic film includes first shell and second shell, the first shell is provided with first cavity towards away from the second shell side, the first surface of stack core faces the first cavity, stack core one side is provided with tab, the second surface of stack core is provided with second cavity towards the second cavity. Angular position protection sheets are respectively arranged at two angular positions of one end, far away from the tabs, of the laminated core, one end of each angular position protection sheet extends to the first surface, and the other end of each angular position protection sheet extends to a side surface which is adjacent to the first surface and is adjacent to the end surface, provided with the tabs, of the laminated core. The corner protection sheets are arranged at the corners of the laminated core, so that the laminated core can be separated from the corresponding corners of the first concave cavity, the corners of the laminated core can be prevented from puncturing an aluminum-plastic film, the safety and reliability of the laminated battery cell are further ensured, and the service life of the laminated battery cell can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a stacked cell, a battery and an electrical device using the same. Background Art

[0002] For a soft-pack stacked cell, during the process of cyclic use, the volume of the cell will expand. Especially under the application conditions of high rate and fast charging, in severe cases, the aluminum-plastic film will rupture, and water vapor will enter the interior of the cell, resulting in rapid expansion and failure of the cell.

[0003] To solve the above problems, it is necessary to set a large gap between the stacked core and the aluminum-plastic film to reduce the extrusion of the aluminum-plastic film when the stacked core expands. However, this solution will reduce the energy density of the battery.

[0004] Therefore, how to improve the safety of the stacked cell is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stacked cell, a battery and an electrical device using the same, which can effectively improve the safety of the stacked cell and thus improve its service life.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A stacked cell includes: a stacked core and an aluminum-plastic film. The stacked core is located inside the aluminum-plastic film. The aluminum-plastic film includes a first shell and a second shell. A first concave cavity is provided on a side of the first shell facing away from the second shell. A first surface of the stacked core faces the first concave cavity. A tab is provided on one side of the stacked core. Corner protection sheets are respectively provided at two corner positions of an end of the stacked core facing away from the tab. One end of the corner protection sheet extends to the first surface, and the other end extends to a side surface adjacent to the first surface and adjacent to an end surface of the stacked core where the tab is provided.

[0008] In some embodiments, the stacked core includes a first pole piece and a second pole piece. The projection of the first pole piece in a first direction is within the projection range of the second pole piece in the first direction. The first direction is a direction perpendicular to the plane where the first pole piece is located. A first rounded corner is provided at a corner of the first pole piece, and a second rounded corner is provided at a corner of the second pole piece. The intersection point of the arc-shaped side line of the first rounded corner and the side line of the first pole piece extending in a second direction, and the intersection point of the arc-shaped side line of the second rounded corner and the side line of the second pole piece extending in the second direction are within the projection range of the corner protection sheet in the first direction. The second direction is the direction from the end of the stacked core where the tab is provided to the other end.

[0009] In some embodiments, a first edge protection sheet is provided at the edge position of the side surface of the first surface adjacent to the end of the stacked core where the tab is provided, and a second edge protection sheet is provided at the edge position of the side surface of the first surface away from the end of the stacked core where the tab is provided. The projections of the first edge protection sheet, the second edge protection sheet, and the corner protection sheet in the first direction do not overlap.

[0010] In some embodiments, the length of the section of the corner protection sheet located on the first surface in the third direction is not less than 1 mm. The third direction is the direction from the first side surface to the second side surface of the stacked core, and the first side surface and the second side surface are two side surfaces adjacent to the side where the stacked core is provided with tabs and adjacent to the first surface.

[0011] In some embodiments, the distance between the intersection point of the arc-shaped edge line of the first rounded corner and the side edge line of the first pole piece extending in the second direction and the first side edge of the corner protection sheet away from the first rounded corner in the second direction is not less than 1 mm.

[0012] In some embodiments, the distance between the intersection point of the arc-shaped edge line of the first rounded corner and the side edge line of the first pole piece extending in the second direction and the second side edge of the corner protection sheet away from the first side edge in the second direction is not less than 0.2 mm and not greater than the thickness of the stacked core in the first direction.

[0013] In some embodiments, the second side edge is located between the intersection point of the arc-shaped edge line of the second rounded corner and the side edge line of the second pole piece extending in the second direction and the side edge line of the second pole piece extending in the third direction.

[0014] In some embodiments, the length of the part of the corner protection sheet corresponding to the side surface of the stacked core in the first direction of the stacked core is not less than 0.2 mm and not greater than the thickness of the stacked core.

[0015] In some embodiments, the thickness of the corner protection sheet is between 10 and 50 μm, including the end point values.

[0016] In some embodiments, the corner protection sheet includes a base material layer and an adhesive layer, and the adhesive layer is provided on one or both sides of the base material layer.

[0017] In some embodiments, the corner protection sheet is a film.

[0018] In some embodiments, a second concave cavity is provided in the second housing in a direction away from the first housing. The first concave cavity and the second concave cavity correspond to each other. The stacked core is located in the cavity formed by the first concave cavity and the second concave cavity. The surface of the stacked core facing the second concave cavity is the second surface, and the corner protection sheet is also provided at the corner position on the side of the second surface away from the tab of the stacked core.

[0019] The present utility model also provides a battery, including the stacked sheet battery cell described in any one of the above.

[0020] The present utility model also provides an electrical device, including the above battery.

[0021] Compared with the prior art, the above technical solution has the following advantages:

[0022] A stacked sheet battery cell, a battery and an electrical device provided by the present utility model include: a stacked core and an aluminum-plastic film. The stacked core is located inside the aluminum-plastic film. The aluminum-plastic film includes a first housing and a second housing. A first concave cavity is provided on the side of the first housing facing away from the second housing. The first surface of the stacked core faces the first concave cavity. A tab is provided on one side of the stacked core. Corner protection sheets are respectively provided at two corner positions at one end of the stacked core away from the tab. One end of the corner protection sheet extends to the first surface, and the other end extends to the side adjacent to the first surface and adjacent to the end face of the stacked core where the tab is provided. By providing the corner protection sheet at the corner position of the stacked core, the corner position corresponding to the first concave cavity of the stacked core can be separated, so that the corner position of the stacked sheet battery cell can be prevented from piercing the aluminum-plastic film, thereby ensuring the safety and reliability of the stacked sheet battery cell assembly, and improving its service life. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0024] Figure 1 It is a schematic cross-sectional structure view of a stacked sheet battery cell provided by a specific embodiment of the present utility model;

[0025] Figure 2 It is a schematic three-dimensional structure view of a stacked sheet battery cell provided by a specific embodiment of the present utility model;

[0026] Figure 3 It is a schematic top view of a stacked sheet battery cell provided by a specific embodiment of the present utility model;

[0027] Figure 4 Schematic diagram of the structure of an electrode sheet of a stacked cell when it is not cut, provided by a specific embodiment of the present utility model;

[0028] Figure 5 Schematic diagram of the structure of an electrode sheet cut out from a stacked cell, provided by a specific embodiment of the present utility model;

[0029] Figure 6 Top view structural diagram of a stacked cell of a stacked cell assembly provided by a specific embodiment of the present utility model;

[0030] Figure 7 Top view structural diagram of a stacked cell of a stacked cell assembly provided by another specific embodiment of the present utility model;

[0031] Figure 8 For Figure 7 Side view structural diagram of the stacked cell;

[0032] Figure 9 For Figure 7 Partial structural diagram of the stacked cell;

[0033] Figure 10 Cross-sectional structural diagram of a stacked cell assembly with two concave cavities provided by a specific embodiment of the present utility model;

[0034] Figure 11 Top view structural diagram of a stacked cell assembly provided by a specific embodiment of the present utility model when the corner protection sheet and the first side protection sheet are of an integral structure;

[0035] Figure 12 For Figure 11 Side view structural diagram of the stacked cell;

[0036] Figure 13 Cross-sectional structural diagram of the corner protection sheet.

[0037] Reference numerals are as follows:

[0038] 10 - Aluminum-plastic film, 100 - Corner area, 11 - First housing, 111 - First concave cavity, 12 - Second housing, 121 - Second concave cavity;

[0039] 20 - Stacked core, 200 - At the corner, 201 - Tab, 202 - First electrode sheet, 203 - Second electrode sheet, 21 - First surface, 22 - Second surface;

[0040] 30 - Corner protection sheet, 301 - Substrate layer, 302 - Adhesive layer;

[0041] 40 - First side - position protection sheet;

[0042] 50 - Second side - position protection sheet. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0044] Please refer to Figures 1 to 6 , a stacked - film battery cell 20 provided by an embodiment of the present utility model includes: a stacked core 20 and an aluminum - plastic film 10. The stacked core 20 is located inside the aluminum - plastic film 10, and the aluminum - plastic film 10 can protect the stacked core 20. The corner - position area 100 of the aluminum - plastic film 10 is as shown in Figure 2 and Figure 3 . As shown in Figures 4 to 5 , the stacked core 20 can be formed by stacking multiple electrode sheets, and the electrode sheets can be formed by cutting. Figure 5 What is shown is an electrode sheet formed by a split - forming sheet - making method. The arc - shaped side line and the side line at the corner position of the obtained electrode sheet have a tip structure, and the corner position 200 thereof is relatively sharp with respect to the wound core. When the electrode sheets are misaligned during stacking or the stacked core 20 moves relative to the aluminum - plastic film 10, the corner position 200 of the stacked core 20 will impact the corner - position area 100 of the aluminum - plastic film 10, thereby causing damage to the corner - position area 100 of the aluminum - plastic film 10. Especially when dropping, it is more likely to pierce the aluminum - plastic film 10 at the corner position. The aluminum - plastic film 10 includes a first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 are hermetically connected. The first shell 11 is provided with a first cavity 111 on the side facing away from the second shell 12. At least part of the structure of the stacked core 20 is located in the first cavity 111. The first surface 21 of the stacked core 20 faces the first cavity 111. A tab 201 is provided on one side of the stacked core 20. Corner - position protection sheets 30 are respectively provided at two corner positions at one end of the stacked core 20 facing away from the tab 201. The corner - position protection sheets 30 can be selected as film sheets. One end of the corner - position protection sheet 30 extends to the first surface 21, and the other end extends to the side adjacent to the first surface 21 and adjacent to the end surface of the stacked core 20 where the tab 201 is provided. By providing the corner - position protection sheets 30 at the corner positions of the stacked core 20, the corner positions corresponding to the first cavity 111 of the stacked core 20 can be separated. Therefore, it can be avoided that the corner positions of the stacked core 20 pierce the corner - position area 100 of the aluminum - plastic film 10, thereby ensuring the safety and reliability of the stacked - film battery cell, and improving its service life. In addition, by separating the corner - position area 100 of the aluminum - plastic film 10 from the corner positions of the stacked core 20, the drop performance of the stacked - film battery cell can be improved.

[0045] It should be noted that in the above embodiments, the corner protection sheet 30 is provided at the corner position at one end of the stacked core 20 away from the tab 201. Further, on this basis, the corner protection sheet 30 can also be provided at the corner position at one end of the stacked core 20 close to the tab 201.

[0046] In some embodiments, reference may be made to Figures 7 to 9 As shown, the stacked core 20 includes a first pole piece 202 and a second pole piece 203. The projection of the first pole piece 202 in the first direction is within the projection range of the second pole piece 203 in the first direction. The first pole piece 202 may be a positive pole piece, and the second pole piece 203 may be a negative pole piece. The first direction is the direction perpendicular to the plane where the first pole piece 202 is located, such as Figure 8 the Z direction shown. A first rounded corner is provided at the corner of the first pole piece 202, and a second rounded corner is provided at the corner of the second pole piece 203. The intersection point A of the arc-shaped side line of the first rounded corner and the side line of the first pole piece 202 extending in the second direction, and the intersection point B of the arc-shaped side line of the second rounded corner and the side line of the second pole piece 203 extending in the second direction are within the projection range of the corner protection sheet 30 in the first direction. The second direction is the direction from one end of the stacked core 20 provided with the tab 201 to the other end, such as Figure 9 the Y direction in. Since the intersection point A of the arc-shaped side line of the first pole piece 202 and its side line and the intersection point B of the arc-shaped side line of the second pole piece 203 and its side line are sharp parts, covering the sharp parts with the corner protection sheet 30 can ensure the safety of the aluminum-plastic film 10.

[0047] In some embodiments, in addition to providing the corner protection sheet 30 at the corner position of the stacked core 20, an edge protection sheet can also be provided at the edge position of the stacked core 20. For example Figure 7 As shown, a first edge protection sheet 40 is provided at the edge position of the side surface of the first surface 21 adjacent to the end of the stacked core 20 provided with the tab 201, and a second edge protection sheet 50 is provided at the edge position of the side surface of the first surface 21 away from the end of the stacked core 20 provided with the tab 201. The first edge protection sheet 40 and the second edge protection sheet 50 can be selected as film sheets. The projections of the first edge protection sheet 40, the second edge protection sheet 50, and the corner protection sheet 30 in the first direction do not overlap, that is, as Figure 9 shown, X1≥0, Y1≥0. The non-overlap of each protection sheet can ensure the energy density of the battery. Multiple first edge protection sheets 40 and second edge protection sheets 50 can be provided at the edge position of the stacked core 20. The first edge protection sheet 40 and the corner protection sheet 30 can be of an integral structure, specifically as Figure 11 and Figure 12 shown.

[0048] In some embodiments, the length of the section of the corner protection piece 30 located on the first surface 21 in the third direction is not less than 1 mm, that is, as Figure 9 shown, X2≥1 mm, to ensure the mounting stability and manufacturability of the corner protection piece 30, where the third direction is the direction from the first side surface to the second side surface of the stacked core 20, such as Figure 7 the X direction in

[0049] In some embodiments, the distance between the intersection point A of the arc-shaped edge line of the first rounded corner and the side edge line of the first pole piece 202 extending in the second direction and the first side edge of the corner protection piece 30 away from the first rounded corner in the second direction is not less than 1 mm, that is, as Figure 9 shown, Y2≥1 mm, to ensure the mounting stability and manufacturability of the corner protection piece 30.

[0050] In some embodiments, the distance between the intersection point A of the arc-shaped edge line of the first rounded corner and the side edge line of the first pole piece 202 extending in the second direction and the second side edge of the corner protection piece 30 away from the first side edge in the second direction is not less than 0.2 mm and not greater than the thickness D of the stacked core 20 in the first direction, that is, as Figure 9 shown, 0.2 mm≤Y3≤D. If it is too small, the protection effect of the corner protection piece 30 will be unstable; if it is too large, it may enter the sealing position between the first housing 11 and the second housing 12, thus affecting the sealing performance of the aluminum-plastic film 10.

[0051] In some embodiments, the second side edge is located between the intersection point B of the arc-shaped edge line of the second rounded corner and the side edge line of the second pole piece 203 extending in the second direction and the side edge line of the second pole piece 203 extending in the third direction, that is, as Figure 9 shown, Y4≥0, that is, the side edge line of the corner protection piece 30 extending in the third direction does not exceed the edge of the second pole piece 203, so as to avoid that after the stacked core 20 is inserted into the aluminum-plastic film 10, the corner protection piece 30 forms a tip, and the excessive extrusion of the aluminum-plastic film 10 is likely to cause the top of the aluminum-plastic film 10 to turn over.

[0052] In some embodiments, the length of the part of the corner protection piece 30 corresponding to the side surface of the stacked core 20 in the first direction of the stacked core 20 is not less than 0.2 mm and not greater than the thickness D of the stacked core 20, that is, as Figure 9 shown, 0.2 mm≤X3≤D. If it is too small, the protection effect of the corner protection piece 30 will be unstable; if it is too large, it may enter the sealing position between the first housing 11 and the second housing 12, thus affecting the sealing performance of the aluminum-plastic film 10.

[0053] In some embodiments, the thickness of the corner protection sheet 30 is between 10 and 50 μm, including the end values. The corner protection sheet 30 within this thickness range can avoid losing the energy density of the battery cell while ensuring manufacturability. In addition, the thicknesses of the first side protection sheet 40 and the second side protection sheet 50 can also be selected to be between 10 and 50 μm, including the end values.

[0054] In some embodiments, as Figure 13 shown, the corner protection sheet 30, the first corner protection sheet 30, and the second corner protection sheet 30 all include a substrate layer 301 and an adhesive layer 302. One or both sides of the substrate layer 301 are provided with the adhesive layer 302. The material of the adhesive layer 302 can be polyolefin, polyurethane, silicone, polyacrylate, rubber, and a composite containing at least one of polyolefin, polyurethane, silicone, and polyacrylate.

[0055] In some embodiments, as Figure 10 shown, a second concave cavity 121 is provided in the second housing 12 in a direction away from the first housing 11. The first concave cavity 111 and the second concave cavity 121 correspond to each other, that is, the recessed positions of the first concave cavity 111 and the second concave cavity 121 correspond. The stacked core 20 is located in the cavity formed by the first concave cavity 111 and the second concave cavity 121. The side of the stacked core 20 facing the second concave cavity 121 is the second surface 22. A corner protection sheet 30 is also provided at the corner position on the side of the battery cell away from the tab 201. The corner protection sheet 30 can also be only located in the deeper one of the first concave cavity 111 and the second concave cavity 121. For example, when the depth of the first concave cavity 111 is deeper, the corner protection sheet 30 is located between the stacked core 20 and the first concave cavity 111. When the depth of the second concave cavity 121 is deeper, the corner protection sheet 30 is located between the battery cell and the second concave cavity 121. When the depth difference between the first concave cavity 111 and the second concave cavity 121 is not large, a corner protection sheet 30 can be provided in at least one of the concave cavities. For example, when the depth ratio T1:T2 of the first concave cavity 111 and the second concave cavity 121 is in the range of 1.1:1 to 1 to 1.1, corner protection sheets 30 are respectively provided between the first concave cavity 111 and the stacked core 20 and between the second concave cavity 121 and the stacked core 20, or a corner protection sheet 30 is only provided between the first concave cavity 111 and the stacked core 20, or a corner protection sheet 30 is only provided between the second concave cavity 121 and the battery cell.

[0056] The embodiment of the present invention also provides a battery, including the stacked sheet battery cell provided in any one of the above embodiments. The beneficial effects of the battery can refer to the above stacked sheet battery cell and will not be elaborated here.

[0057] The embodiment of the present utility model further provides an electrical device, including the battery provided in the above embodiment. For the beneficial effects of the electrical device, reference may be made to the above cell assembly, which will not be elaborated here.

[0058] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0059] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0060] The above has introduced in detail a stacked cell, a battery and an electrical device provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A laminated battery cell, comprising: An aluminum-plastic film (10) and a stacked core (20), wherein the stacked core (20) is located inside the aluminum-plastic film (10), characterized in that the aluminum-plastic film (10) comprises a first shell (11) and a second shell (12), wherein the first shell (11) is provided with a first cavity (111) on a side facing away from the second shell (12), a first surface (21) of the stacked core (20) faces the first cavity (111), a pole lug (201) is provided on one side of the stacked core (20), and corner protection sheets (30) are respectively provided at two corners of an end of the stacked core (20) facing away from the pole lug (201), one end of the corner protection sheet (30) extends to the first surface (21), and the other end extends to a side surface adjacent to the first surface (21) and adjacent to an end surface of the stacked core (20) on which the pole lug (201) is provided.

2. The laminated battery cell according to claim 1, characterized in that: The stacked core (20) comprises a first pole piece (202) and a second pole piece (203), the projection of the first pole piece (202) in a first direction is located within the projection range of the second pole piece (203) in the first direction, the first direction is a direction perpendicular to a plane in which the first pole piece (202) is located, a first rounded corner is provided at an edge of the first pole piece (202), a second rounded corner is provided at an edge of the second pole piece (203), an intersection point of an arcuate edge line of the first rounded corner and a side line of the first pole piece (202) extending in a second direction, and an intersection point of an arcuate edge line of the second rounded corner and a side line of the second pole piece (203) extending in the second direction are located within the projection range of the corner protection sheet (30) in the first direction, and the second direction is a direction from one end of the stacked core (20) where the pole ear (201) is provided to the other end.

3. The laminated battery cell according to claim 2, characterized in that: A first edge protection sheet (40) is provided at an edge of the first surface (21) and a side surface adjacent to an end of the stacked core (20) provided with the pole lug (201), and a second edge protection sheet (50) is provided at an edge of the first surface (21) and a side surface away from an end of the stacked core (20) provided with the pole lug (201), wherein projections of the first edge protection sheet (40), the second edge protection sheet (50) and the corner protection sheet (30) in the first direction do not overlap.

4. The laminated battery cell according to claim 3, characterized in that: The length of the section of the corner protection sheet (30) located on the first surface (21) in a third direction is not less than 1 mm, the third direction being the direction from the first side surface to the second side surface of the stacked core (20), the first side surface and the second side surface being two side surfaces adjacent to a side of the stacked core (20) provided with a pole ear (201) and adjacent to the first surface (21).

5. The laminated battery cell according to claim 4, characterized in that: The spacing between the intersection of the arcuate edge line of the first fillet and the side line of the first pole piece (202) extending in the second direction and the first side edge of the corner protection sheet (30) away from the first fillet in the second direction is not less than 1 mm.

6. The laminated battery cell according to claim 5, characterized in that: The spacing between the intersection of the arc-shaped edge line of the first fillet and the side line of the first pole piece (202) extending along the second direction and the second side edge of the corner protection sheet (30) away from the first side edge in the second direction is not less than 0.2 mm, and is not greater than the thickness of the stacked core (20) in the first direction.

7. The laminated battery cell according to claim 6, characterized in that: The second side edge is located between the intersection of the arc-shaped edge line of the second fillet and the side line of the second pole piece (203) extending along the second direction and the side line of the second pole piece (203) extending along the third direction.

8. The laminated battery cell according to claim 7, characterized in that: The length of the portion of the corner protection sheet (30) corresponding to the side surface of the stacked core (20) in the first direction of the stacked core (20) is not less than 0.2 mm and not greater than the thickness of the stacked core (20).

9. The laminated battery cell according to claim 1, characterized in that: The thickness of the corner protection sheet (30) is between 10 and 50 μm, including the end values.

10. The laminated battery cell according to claim 1, characterized in that: The corner protection sheet (30) comprises a base material layer (301) and an adhesive layer (302), and the adhesive layer (302) is provided on one or both sides of the base material layer (301).

11. The laminated battery cell according to claim 1, characterized in that: The corner protection sheet (30) is a film.

12. The laminated battery core according to any one of claims 1 to 11, characterized in that: A second cavity (121) is provided in the second shell (12) in a direction away from the first shell (11); the first cavity (111) and the second cavity (121) correspond to each other; the stacked core (20) is located in a chamber formed by the first cavity (111) and the second cavity (121); a side of the stacked core (20) facing the second cavity (121) is a second surface (22); and a corner protection sheet (30) is also provided at a corner away from the tab (201) between the second surface (22) and the side surface of the stacked core (20).

13. A battery, characterized in that: A laminated battery cell comprising any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising the battery of claim 13.

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