Current collector and battery

Abstract

A current collector comprises a substrate layer, a first electrically conductive layer, and a vane section. The substrate layer consists of an electrically insulating resin composition. The first electrically conductive layer is laminated onto the substrate layer. The vane section consists of a film-like element. The vane section comprises a vane body section and a first heat dissipation section. The vane body section is connected to the first electrically conductive layer by ultrasonic welding. The vane body section extends away from the first electrically conductive layer. The first heat dissipation section is shorter than the vane body section in one direction of extension. The first heat dissipation section is not connected to the first electrically conductive layer by ultrasonic welding.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present invention relates to a current collector and a battery. 2. Description of the state of the art

[0002] Japanese patent application JP 2024-510696A discloses a conventional pole plate. The pole plate comprises a current collector, an active material layer, and an electrical connector. The current collector comprises a substrate layer and an electrically conductive layer. The electrically conductive layer is located on a surface of the substrate layer. Within the current collector, the electrically conductive layer performs the functions of electrical conduction and current collection, supplying electrons to the active material layer. The electrical connector and the current collector are joined at an edge of the current collector by welding. The welded joint is referred to as the weld joint area. SUMMARY OF THE INVENTION

[0003] The electrical resistance is relatively high in the welded joint area. Therefore, when current is applied to the current collector, a relatively large amount of heat is generated in this area. However, adding a mold or element to limit heat generation can increase the manufacturing costs and weight of the current collector.

[0004] The present invention was made taking into account the above-mentioned problem and aims to provide a current collector that makes it possible to limit the heat generation when supplied with current while limiting the increase in manufacturing costs and weight, as well as to provide a battery that contains the current collector.

[0005] A current collector according to one aspect of the present invention comprises a substrate layer, a first electrically conductive layer, and a flag section. The substrate layer consists of an electrically insulating resin composition. The first electrically conductive layer is laminated onto the substrate layer. The flag section consists of a film-shaped element. The flag section comprises a flag body section and a first heat dissipation section. The flag body section is connected to the first electrically conductive layer by ultrasonic welding. The flag body section extends away from the first electrically conductive layer. The first heat dissipation section is shorter than the flag body section in one direction of extension. The first heat dissipation section is not connected to the first electrically conductive layer by ultrasonic welding.

[0006] A battery according to one aspect of the present invention comprises an electrode body and an external terminal. The electrode body comprises a first electrode, a second electrode, and a separator. The first electrode comprises a current collector and an active material layer. The current collector comprises a substrate, a first electrically conductive layer, and a flag section. The substrate consists of an electrically insulating resin composition. The first electrically conductive layer is laminated onto the substrate. The flag section consists of a film-shaped element. The flag section comprises a flag body section and a first heat dissipation section. The flag body section is connected to the first electrically conductive layer by ultrasonic welding. The flag body section extends away from the first electrically conductive layer.The first heat dissipation section is shorter than the flag body section in the direction of extension. The first heat dissipation section is not connected to the first electrically conductive layer by ultrasonic welding. The active material layer is laminated onto the first electrically conductive layer. The separator is laminated onto the active material layer. The second electrode is laminated through the separator onto the active material layer. The external connection is electrically connected to the flag body section.

[0007] The configurations mentioned above make it possible to limit heat generation during energy input while simultaneously limiting the increase in production costs and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The features and advantages as well as the technical and economic significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which the same reference numerals denote the same elements, showing Fig. 1 a sectional view of a battery according to embodiment 1; Fig. 2 a sectional view of an electrode body in the direction of arrow line II-II in Fig. 1; Fig. 3 A schematic sectional view of the electrode body in partial view in the direction of arrow line III-III in Fig. 1; Fig. 4. An unfolded view of a first electrode; Fig. 5A a partial sectional view of the first electrode in the direction of the arrow line VA-VA in Fig. 4; Fig. 5B a partial sectional view of the first electrode in the direction of the arrow line VB-VB in Fig. 4; and Fig. 6 a partial sectional view of a first electrode in embodiment 2. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0009] Current collectors and batteries according to embodiments of the present invention are described below with reference to the drawings. In the figures, identical or corresponding parts are identified by identical reference numerals, and their descriptions are not repeated. Design 1

[0010] Fig. Figure 1 is a sectional view showing a battery according to embodiment 1. The in Fig. Battery 1, shown in Figure 1, is a so-called rectangular battery. Battery 1 can be a secondary battery configured to be charged and discharged, such as a lithium-ion battery or a nickel-hydrogen battery. Battery 1 can, for example, be used as a cell in an energy storage module installed in an electric vehicle.

[0011] As in Fig. As shown in Figure 1, the battery 1 according to embodiment 1 of the present invention comprises an electrode body 10, a housing 20, a first external terminal 30A, a second external terminal 30B, a first coupling element 40A and a second coupling element 40B. First, the components of the battery 1, other than the electrode body 10, are described.

[0012] The housing 20 is electrically conductive. For example, a portion of the housing 20 that is electrically conductive is made of a metal such as aluminum. The housing 20 contains the electrode body 10. The housing 20 also contains an electrolyte solution (not shown). The housing 20 comprises a housing body 21 and a lid 22. The housing body 21 includes a bottom wall 21a and a circumferential wall 21b that projects from the bottom wall 21a.

[0013] The cover 22 is connected to the circumferential wall 21b by welding or the like in order to close an opening in the circumferential wall 21b. A first coupling hole 22a and a second coupling hole 22b are formed on the cover 22.

[0014] The first external terminal 30A and the second external terminal 30B are positioned on battery 1 so that they are exposed to the outside. The first coupling element 40A and the second coupling element 40B are electrically conductive. At least a portion of the first coupling element 40A and at least a portion of the second coupling element 40B are located inside the housing 20.

[0015] The first external terminal 30A or the first coupling element 40A is inserted into the first coupling hole 22a. The first external terminal 30A is electrically connected to the first coupling element 40A. In particular, the first external terminal 30A and the first coupling element 40A are connected to each other. The first coupling element 40A is connected to the electrode body 10. Thus, the first external terminal 30A is electrically connected to the electrode body 10.

[0016] The second external connection 30B or the second coupling element 40B is inserted into the second coupling hole 22b. The second external connection 30B is electrically connected to the second coupling element 40B. In particular, the second external connection 30B and the second coupling element 40B are connected to each other. The second coupling element 40B is connected to the electrode body 10. Thus, the second external connection 30B is electrically connected to the electrode body 10.

[0017] In this embodiment, the first external terminal 30A is a positive electrode terminal and the second external terminal 30B is a negative electrode terminal. The first external terminal 30A and the second external terminal 30B are arranged in a second direction D2. The second direction D2 is orthogonal to a first direction D1.

[0018] Next, the electrode body 10 is described. The battery 1 according to the embodiment comprises several electrode bodies 10. Typically, the battery 1 comprises two electrode bodies 10. The electrode bodies 10 are arranged in a third direction D3. The third direction D3 is a direction that is orthogonal to both the first direction D1 and the second direction D2.

[0019] The following describes one of the electrode bodies 10. Each of the electrode bodies 10 can have the following configuration.

[0020] Fig. 2 is a sectional view of the electrode body in the direction of arrow line II-II in Fig. 1. Fig. Figure 3 is a schematic sectional view of the electrode body, partially seen in the direction of arrow line III-III in Fig. 1. As in Fig. 1 to Fig. As shown in Figure 3, the electrode body 10 comprises a first electrode 11A, a second electrode 11B, and a separator 12. In the electrode body 10, the first electrode 11A, the second electrode 11B, and the separator 12 are wound such that they surround the circumference of a winding axis Z. In this embodiment, the electrode body 10 is a so-called wound electrode body. However, the electrode body 10 can also be a laminated electrode body in which the first electrode 11A, the second electrode 11B, and the separator 12 are laminated in one direction (for example, the third direction D3). Fig. 2 and Fig. Separator 12 is schematically represented by dashed lines.

[0021] Each outer shape of the first electrode 11A and the second electrode 11B is a sheet shape. The electrode body 10 consists of a pole plate group in which the first electrode 11A and the second electrode 11B are wound through one or more separators 12.

[0022] In this embodiment, the first electrode 11A is a positive electrode and the second electrode 11B is a negative electrode. However, the first electrode 11A can be a negative electrode and the second electrode 11B a positive electrode.

[0023] The separator 12 is positioned between the first electrode 11A and the second electrode 11B. The separator 12 separates the first electrode 11A and the second electrode 11B from each other, while allowing the movement of ions between them. These ions could be, for example, lithium ions. The separator 12 is electrically insulated.

[0024] Fig. Figure 4 shows an unfolded view of the first electrode. That is to say, Fig. Figure 4 shows a state before the winding of the first electrode 11A. Fig. 5A is a partial sectional view of the first electrode in the direction of the arrow line VA-VA in Fig. 4. Fig. 5B is a partial sectional view of the first electrode in the direction of the arrow line VB-VB in Fig. 4.

[0025] As in Fig. 2 to Fig. As shown in Figure 5B, the first electrode 11A comprises a first current collector 100A, a first active material layer 200A, a first protective section 400 and a second protective section 500.

[0026] The first current collector 100A comprises a carrier layer 110, a first electrically conductive layer 120, a second electrically conductive layer 130, several flag sections 140 and several adhesive elements 150.

[0027] The carrier layer 110 consists of an electrically insulating resin composition. Therefore, the first pantograph 100A is a composite pantograph, consisting of an electrically conductive element and an electrically insulating element. This makes the first pantograph 100A lighter and the overall safety of the battery 1 higher than in a case where the entire first pantograph 100A is made of metal.

[0028] The carrier layer 110 consists of a resin composition containing, for example, polyamide resin, polyester resin, or polyolefin resin. For high stiffness, it is advantageous that the carrier layer 110 consists of a resin composition containing polyester resin. It is further advantageous that the carrier layer 110 consists essentially of polyester resin. The polyester resin can be, for example, polyethylene terephthalate. This makes it possible to increase the stiffness of the first current collector 100A while simultaneously maintaining the electrical insulation of the carrier layer 110. Furthermore, it is possible to make the carrier layer 110 relatively thin.

[0029] An orthogonal direction D0, which is orthogonal to a thickness direction DT of the support layer 110, runs approximately parallel to the first direction D1. That is, the support layer 110 runs approximately parallel to the first direction D1.

[0030] To reduce the overall thickness of the electrode body 10, the thickness of the support layer 110 should, for example, preferably be 20 µm or less, more preferably 15 µm or less, and particularly preferably 10 µm or less. The thickness of the support layer 110 is not particularly limited as long as a desired stiffness is achieved. For example, the thickness of the support layer 110 can be 2 µm or more.

[0031] The first electrically conductive layer 120 is laminated onto the substrate layer 110. The first electrically conductive layer 120 is provided on one surface of the substrate layer 110. The first electrically conductive layer 120 is provided over the entire surface.

[0032] In this embodiment, the first electrically conductive layer 120 is positioned on the side of the winding axis Z relative to the support layer 110. However, the first electrically conductive layer 120 can also be positioned on the side of the support layer 110 opposite the winding axis Z.

[0033] The second electrically conductive layer 130 is laminated onto the substrate layer 110 so that it faces the first electrically conductive layer 120. That is, the second electrically conductive layer 130 is located on the other surface of the substrate layer 110. The second electrically conductive layer 130 covers the entire other surface.

[0034] The thickness of the first electrically conductive layer 120 and the thickness of the second electrically conductive layer 130 are less than the thickness of the support layer 110. To reduce the overall thickness of the electrode body 10, the thickness of the first electrically conductive layer 120 and the thickness of the second electrically conductive layer 130 is, for example, 5 µm or less, preferably 2 µm or less, and particularly preferably 1 µm or less. To prevent the electrical resistance of the first electrically conductive layer 120 and the second electrically conductive layer 130 from becoming excessively high, the thickness of the first electrically conductive layer 120 and the thickness of the second electrically conductive layer 130 can, for example, be 0.1 µm or more.If the thickness of the first electrically conductive layer 120 and the thickness of the second electrically conductive layer 130 is 5 µm or less, it is difficult to directly weld the first electrically conductive layer 120 and the second electrically conductive layer 130 together or to directly join them together by ultrasonic welding.

[0035] A method for forming the first electrically conductive layer 120 and the second electrically conductive layer 130 is not particularly restricted. Typically, the first electrically conductive layer 120 and the second electrically conductive layer 130 can be provided on the substrate layer 110 by a deposition process or the like. The first electrically conductive layer 120 and the second electrically conductive layer 130 can each consist of a metal foil. In this case, the first electrically conductive layer 120 and the second electrically conductive layer 130 can be bonded to the substrate layer 110 by means of a resin adhesive.

[0036] Furthermore, each of the first electrically conductive layer 120 and the second electrically conductive layer 130 typically consists of a metal containing aluminum. This allows the first current collector 100A, comprising the first electrically conductive layer 120 and the second electrically conductive layer 130, to be suitablely used as a positive electrode current collector. The first current collector 100A can also be a negative electrode current collector, and each of the first electrically conductive layer 120 and the second electrically conductive layer 130 can consist of a copper-containing metal.

[0037] As in Fig. As shown in Figure 4, the flag sections 140 are arranged in a winding direction DR of the electrode body 10. The flag sections 140 are spaced apart from each other.

[0038] Furthermore, as in Fig. As shown in Figure 2, the flag sections 140 are arranged in the third direction D3. The flag sections 140 are joined together by ultrasonic welding or the like. Furthermore, as shown in Figure 2, the flag sections 140 are arranged in the third direction D3. Fig. As shown in Figure 1, the flag sections 140 are connected to the first coupling element 40A by ultrasonic welding or similar means. This electrically connects the first external connection 30A to the flag sections 140. The components contained in each of the flag sections 140 are described below.

[0039] The flag section 140 consists of a film-like element. Typically, the flag section 140 consists of a metal film containing aluminum or copper. As in Fig. As shown in Figure 5A, the flag section 140 comprises a flag body section 141, a first heat dissipation section 142, a second heat dissipation section 143 and a connecting auxiliary section 144.

[0040] The flag body section 141 is connected to the first electrically conductive layer 120 by ultrasonic welding. The flag body section 141 extends along the first electrically conductive layer 120 in the orthogonal direction DO (the first direction D1). The flag body section 141 extends away from the first electrically conductive layer 120. One extension direction DE of the flag body section 141 is essentially parallel to the orthogonal direction DO (the first direction D1).

[0041] As in Fig. As shown in Figure 4, the first heat dissipation section 142 is continuous with the flag body section 141 in the winding direction DR. The first heat dissipation section 142 is formed by an element that is integrated with the flag body section 141. The first heat dissipation section 142 is shorter than the flag body section 141 in the extension direction DE of the flag body section 141.

[0042] As in Fig. As shown in Figure 5B, the first heat dissipation section 142 is positioned on the side of the first electrically conductive layer 120 opposite the support layer 110. The first heat dissipation section 142 is not connected to the first electrically conductive layer 120 by ultrasonic welding. However, the first heat dissipation section 142 is in contact with the first electrically conductive layer 120.

[0043] The second heat dissipation section 143 is located on the side of the carrier layer 110 opposite the first electrically conductive layer 120. More precisely, the second heat dissipation section 143 is located on the side of the carrier layer 110 opposite the second electrically conductive layer 130. The second heat dissipation section 143 is not connected to the second electrically conductive layer 130 by ultrasonic welding. However, the second heat dissipation section 143 is in contact with the second electrically conductive layer 130. The second heat dissipation section 143 and the first heat dissipation section 142 are arranged in the thickness direction DT.

[0044] As in Fig. As shown in Figure 5A, the connecting aid section 144 is connected to the second electrically conductive layer 130 by ultrasonic welding. The connecting aid section 144 extends along the second electrically conductive layer 130 in the orthogonal direction DO (of the first direction D1). The connecting aid section 144 extends from the second electrically conductive layer 130 in the extension direction DE. The connecting aid section 144 is also connected to the flag body section 141 by ultrasonic welding. The connecting aid section 144 is shorter than the flag body section 141 in the extension direction DE. Furthermore, the connecting aid section 144 and the flag body section 141 are arranged in the thickness direction DT. In addition, the connecting aid section 144 is continuous with the second heat dissipation section 143 in the winding direction DR (see Figure 5A). Fig. 4) The connecting auxiliary section 144 is formed by an element that is integrated with the second heat dissipation section 143.

[0045] Each of the thicknesses of the flag body 141, the first heat dissipation section 142, the second heat dissipation section 143, and the connecting aid section 144 is greater than each of the thicknesses of the first electrically conductive layer 120 and the second electrically conductive layer 130. The thicknesses of the flag body 141, the first heat dissipation section 142, the second heat dissipation section 143, and the connecting aid section 144 should, for example, preferably be 20 µm or less, more preferably 15 µm or less, and particularly preferably 10 µm or less. The thicknesses of the flag body 141, the first heat dissipation section 142, the second heat dissipation section 143, and the connecting aid section 144 are not particularly limited as long as a desired stiffness is achieved.For example, each of the thicknesses of the flag body 141, the first heat dissipation section 142, the second heat dissipation section 143 and the connecting aid section 144 can be 2 µm or more.

[0046] An adhesive element 150 connects a first end section 142e, which is an end section of the first heat-dissipating section 142 in the extension direction DE, and a second end section 143e, which is an end section of the second heat-dissipating section 143 in the extension direction DE. The material of which the adhesive element 150 is made is not particularly restricted and is, for example, a resin with adhesive properties. The resin may contain a metal filler, so that the adhesive element 150 is electrically conductive. In this case, the first end section 142e is electrically connected to the second end section 143e.

[0047] As in Fig. 2 and Fig. As shown in Figure 3, the first active material layer 200A is laminated onto the first electrically conductive layer 120 and the second electrically conductive layer 130. The first active material layer 200A is a positive electrode active material layer, but it can also be a negative electrode active material layer. The first active material layer 200A is spaced apart from the flag section 140.

[0048] The separator 12 is laminated onto the first active material layer 200A in a radial direction from the winding axis line Z.

[0049] The first protective section 400 consists of a ceramic with electrical insulation. As in Fig. As shown in Figures 5A and others, the first protective section 400 covers a portion belonging to the first active material layer 200A, which is laminated onto the first electrically conductive layer 120, and which is located on one side in the extension direction DE. The first protective section 400 covers the entire surface of the first electrically conductive layer 120 between the first active material layer 200A and the flag body section 141. The first protective section 400 is also partially located between the first electrically conductive layer 120 and the flag body section 141.

[0050] The second protective section 500 consists of a ceramic with electrical insulation. The second protective section 500 covers part of the first active material layer 200A, which is laminated onto the second electrically conductive layer 130 and is located on one side in the direction of extension DE. The second protective section 500 covers the entire surface of the second electrically conductive layer 130 between the first active material layer 200A and the connecting auxiliary section 144. The second protective section 500 is also partially located between the second electrically conductive layer 130 and the connecting auxiliary section 144.

[0051] As in Fig. 2 and Fig. As shown in Figure 3, the second electrode 11B is laminated to the first active material layer 200A through the separator 12 in the radial direction mentioned above. In this embodiment, the electrode body 10 comprises several separators 12, but can also comprise a single separator 12.

[0052] The second electrode 11B comprises a second current collector 100B and a second active material layer 200B. The second current collector 100B comprises an electrically conductive support section 170 and several second flag sections 180 (see Fig. 3) The electrically conductive support section 170 extends along the orthogonal direction DO (the first direction D1). The second flag sections 180 extend from an upper end of the electrically conductive support section 170. The second flag sections 180 are joined to each other by ultrasonic welding and are connected to the second coupling element 40B (see Fig. 1).

[0053] The second flag sections 180 and the electrically conductive support section 170 are formed from an integrated element and are, for example, made of a metal foil. In this embodiment, the second flag sections 180 and the electrically conductive support section 170 consist, for example, of a copper-containing metal. This allows the second current collector 100B to be used as a negative electrode current collector. In the case where the first current collector 100A is a negative electrode current collector and the second current collector 100B is a positive electrode current collector, the second flag sections 180 and the electrically conductive support section 170 can consist of an aluminum-containing metal.

[0054] The second active material layer 200B is laminated to both surfaces of the electrically conductive carrier section 170 of the second current collector 100B. In this embodiment, the second electrode 11B is a negative electrode. Therefore, the second active material layer 200B is a negative electrode active material layer. The second active material layer 200B can also be a positive electrode active material layer.

[0055] As described above, the first current collector 100A according to embodiment 1 of the present invention comprises the carrier layer 110, the first electrically conductive layer 120, and the flag section 140. The carrier layer 110 consists of an electrically insulating resin composition. The first electrically conductive layer 120 is laminated onto the carrier layer 110. The flag section 140 consists of a film-shaped element. The flag section 140 comprises the flag body section 141 and the first heat dissipation section 142. The flag body section 141 is connected to the first electrically conductive layer 120 by ultrasonic welding. The flag body section 141 extends away from the first electrically conductive layer 120. The first heat dissipation section 142 is shorter than the flag body section 141 in the extension direction DE of the flag body section 141.The first heat dissipation section 142 is not connected to the first electrically conductive layer 120 by ultrasonic welding.

[0056] Ultrasonic welding reduces the energy required to connect the first electrically conductive layer 120 to the flag section 140. Since the flag section 140 includes the first heat dissipation section 142, the heat generated by the flag body section 141 when current is applied can be easily dissipated. Because the first heat dissipation section 142 is shorter in the extension direction DE than the flag body section 141, the weight increase of the first current collector 100A can be limited. Furthermore, the first heat dissipation section 142 is not connected to the first electrically conductive layer 120 by ultrasonic welding. Therefore, regardless of the shape of the first heat dissipation section 142, which is relatively short in the extension direction DE, the flag section 140 can be easily connected to the first electrically conductive layer 120 through a simple process.

[0057] Accordingly, with the above configuration it is possible to provide the first current collector 100A, which limits the heat generation at the time of current application and at the same time limits the increase in production costs and weight, as well as to provide battery 1, which contains the first current collector 100A.

[0058] Furthermore, the above configuration can also have the following effects. The first heat dissipation section 142 has the shape described above, and therefore, if the first heat dissipation section 142 is also connected to the first electrically conductive layer 120 by ultrasonic welding, it may be necessary to connect an original fabric film to the first electrically conductive layer 120 by ultrasonic welding and then cut off the flag section 140 containing the first heat dissipation section 142 from the original fabric film. Therefore, the disposal loss for the original fabric film can be significant. With the above configuration, the flag section 140, after being cut off from the original fabric film, can be easily connected to the first electrically conductive layer 120.This increases the degree of freedom when cutting the flag section 140 from the original fabric film, and a reduction in the disposal loss of the original fabric film, which is a raw material of the flag section 140, can be expected.

[0059] Furthermore, in this embodiment, the first current collector 100A also includes the adhesive element 150. The flag section 140 also includes the second heat dissipation section 143. The first heat dissipation section 142 is positioned on the side of the first electrically conductive layer 120 opposite the carrier layer 110. The second heat dissipation section 143 is positioned on the side of the carrier layer 110 opposite the first electrically conductive layer 120. The adhesive element 150 connects the first end section 142e, which is the end section of the first heat dissipation section 142 in the extension direction DE, with the second end section 143e, which is the end section of the second heat dissipation section 143 in the extension direction DE.

[0060] With the above configuration, the heat from the flag section 140 can be more effectively dissipated at the time of current application through the first heat dissipation section 142 and the second heat dissipation section 143.

[0061] Furthermore, in this embodiment, the first heat dissipation section 142 is in contact with the first electrically conductive layer 120.

[0062] With the above configuration, at the time the first electrically conductive layer 120 and the flag section 140 are supplied with current, an electric current also flows through the first heat dissipation section 142, which limits the heat generation at a connection point between the flag body section 141 and the first electrically conductive layer 120.

[0063] Furthermore, in this embodiment, the second heat dissipation section 143 is in contact with the second electrically conductive layer 130. The first end region 142e is electrically connected to the second end region 143e.

[0064] With the above configuration, an electrically conductive path from the second electrically conductive layer 130 to the flag section 140 can be ensured through the second heat dissipation section 143. Design 2

[0065] Next, a first current collector and a battery according to embodiment 2 of the present invention are described. Descriptions of identical configurations and effects as in embodiment 1 are not repeated in some cases.

[0066] Fig. Figure 6 is a partial sectional view of a first electrode in embodiment 2. Fig. Figure 6 shows a section from a direction that corresponds to the section in Fig. 5B in embodiment 1 corresponds. As in Fig. As shown in Figure 6, in embodiment 2 of the present invention, a second end section 143ea is directly connected to the first end section 142e. With this configuration, the second heat dissipation section 143a can be formed relatively easily by folding a single flat film, forming the flag section 140, at a section corresponding to a connecting section between the first end section 142e and the second end section 143ea. In this embodiment as well, the first end section 142e is electrically connected to the second end section 143ea.

[0067] In the above descriptions of the embodiments, combinable configurations can be combined with one another.

[0068] The embodiments disclosed herein are to be regarded in every respect as illustrative and not limiting. The scope of the present invention is defined by the claims and not by the preceding description and is intended to include all modifications that fall within the meaning and scope of the claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024 - 510 696 A

[0002]

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