CN218827335U - Battery core and battery - Google Patents

Abstract

The application provides an electricity core relates to new forms of energy technical field, has solved the big problem of the step lamination battery manufacturing degree of difficulty. This electricity core includes: the first stacked core and the second stacked core are stacked, wherein the first stacked core and the second stacked core respectively comprise a plurality of first pole pieces and second pole pieces which are stacked in a staggered mode, the projection of the first stacked core on a plane parallel to the first pole pieces is within the projection range of the second stacked core on the plane, the first stacked core and the second stacked core respectively comprise a plurality of first pole lugs and a plurality of second pole lugs, the projection of the first pole lugs included in the first stacked core and the projection of the first pole lugs included in the second stacked core on the plane have overlapping areas, and the projection of the second pole lugs included in the first stacked core and the projection of the second pole lugs included in the second stacked core on the plane also have overlapping areas. The first stacking core and the second stacking core which are arranged in different shapes in a stacking mode can flexibly adapt to battery bin structures in different shapes, the manufacturing process is simple, and mass production is easy to achieve.

Description

Battery core and battery

Technical Field

The application relates to the technical field of new energy, in particular to a battery cell and a battery.

Background

With the development of economy and the progress of science and technology, intelligent products have been deeply developed in the aspects of people's life. In order to improve user experience, intelligent products are developing more and more towards the direction of lightness and miniaturization, and lithium ion button batteries capable of being repeatedly and circularly charged and used are gradually applied to various fields of daily life of people, such as wearable products, computer products, medical products and the like.

In order to adapt to the battery compartment structure of each terminal product, the lithium battery needs to be designed into various special shapes, such as a step battery. However, due to the limitation of the prior art, the process of the stepped lamination lithium battery is complex, the manufacturing difficulty is high, and mass production is difficult to realize.

SUMMERY OF THE UTILITY MODEL

The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides a battery core and a battery.

In a first aspect, an embodiment of the present application provides an electrical core, where the electrical core includes: the first folded core and the second folded core are arranged in a stacked mode, each of the first folded core and the second folded core comprises a plurality of first pole pieces and a plurality of second pole pieces which are arranged in a staggered and stacked mode, the projection of the first folded core on a plane parallel to the first pole pieces is within the projection range of the second folded core on the plane parallel to the first pole pieces, the first folded core and the second folded core respectively comprise a plurality of first pole lugs and a plurality of second pole lugs, the projection of the first pole lugs included in the first folded core and the projection of the first pole lugs included in the second folded core on the plane parallel to the first pole pieces are provided with overlapping areas, and the projection of the second pole lugs included in the first folded core and the projection of the second folded core on the plane parallel to the first pole pieces are also provided with overlapping areas.

With reference to the first aspect, in certain implementations of the first aspect, the first pole piece includes a first current collector and a first polar active layer coated on a surface of the first current collector, and the first current collector of the first pole piece adjacent to the second stacked core corresponding to the first stacked core is disposed opposite to the first current collector of the first pole piece adjacent to the first stacked core corresponding to the second stacked core.

With reference to the first aspect, in certain implementations of the first aspect, the first current collector, which is close to the second stacked core, corresponding to the first stacked core, and the first current collector, which is close to the first stacked core, corresponding to the second stacked core, are bonded together by any one of a hot melt adhesive, a polypropylene adhesive, and a double-sided tape.

With reference to the first aspect, in certain implementations of the first aspect, the first stacked core includes a first pole piece facing away from the second stacked core, and includes a first current collector and a first polar active layer coated on a surface of the first current collector on a side close to the second stacked core.

With reference to the first aspect, in certain implementation manners of the first aspect, the battery cell further includes: and the first diaphragm is bonded with the first polar active layer corresponding to the first pole piece which is contained in the first stacked core and faces away from the second stacked core.

With reference to the first aspect, in certain implementations of the first aspect, the second stacked core includes a first pole piece facing away from the first stacked core, and the first pole piece includes a first current collector and a first polar active layer coated on a side surface of the first current collector near the first stacked core.

With reference to the first aspect, in certain implementations of the first aspect, the battery cell further includes: and the second diaphragm is bonded with the first polar active layer corresponding to the first pole piece which is contained in the second stacked core and faces away from the first stacked core.

With reference to the first aspect, in certain implementations of the first aspect, a projection of the at least one side of the first stack of cores onto a plane parallel to the first pole piece coincides with a projection of the at least one side of the second stack of cores onto a plane parallel to the first pole piece.

With reference to the first aspect, in certain implementations of the first aspect, the first pole piece includes a first current collector, a surface of the first current collector includes an uncoated region proximate to one end of the first tab, the uncoated region being provided with an insulating layer.

With reference to the first aspect, in certain implementations of the first aspect, the battery cell further includes: the composite unit comprises a third diaphragm, a first pole piece, a fourth diaphragm and a second pole piece which are sequentially stacked and bonded with each other.

With reference to the first aspect, in certain implementations of the first aspect, a portion of the third membrane that extends beyond the first pole piece is bonded to a portion of the fourth membrane that extends beyond the first pole piece.

With reference to the first aspect, in certain implementations of the first aspect, the first pole piece is a positive pole piece; the second pole piece is a negative pole piece.

In a second aspect, an embodiment of the present application provides a battery including a battery cell as mentioned in any of the above embodiments and a casing including the battery cell.

With reference to the second aspect, in certain implementation manners of the second aspect, the first pole piece of the first stacked core, which faces away from the second stacked core, includes a first current collector, and the first current collector is disposed opposite to the case, and/or the first pole piece of the second stacked core, which faces away from the first stacked core, includes a first current collector, and the first current collector is disposed opposite to the case.

The application provides an electric core, this electric core includes: the first folded core and the second folded core are arranged in a stacked mode, each of the first folded core and the second folded core comprises a plurality of first pole pieces and a plurality of second pole pieces which are arranged in a staggered and stacked mode, the projection of the first folded core on a plane parallel to the first pole pieces is within the projection range of the second folded core on the plane parallel to the first pole pieces, the first folded core and the second folded core respectively comprise a plurality of first pole lugs and a plurality of second pole lugs, the projection of the first pole lugs included in the first folded core and the projection of the first pole lugs included in the second folded core on the plane parallel to the first pole pieces are provided with overlapping areas, and the projection of the second pole lugs included in the first folded core and the projection of the second folded core on the plane parallel to the first pole pieces are also provided with overlapping areas. This application is through range upon range of the first core and the second of folding of setting up different shapes of setting for first folding core is in above-mentioned planar projection, folds the core at above-mentioned planar projection within range at the second, thereby can adapt to the battery compartment structure of different shapes in a flexible way, and manufacturing process is simple, realizes the volume production easily.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1a is a schematic structural diagram of a battery cell according to an exemplary embodiment of the present disclosure.

Fig. 1b is a schematic diagram illustrating a structure of the battery cell shown in fig. 1a in the N direction.

Fig. 2 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application.

Fig. 3 is a schematic structural diagram of a first pole piece included in a first stacked core and facing away from a second stacked core according to an exemplary embodiment of the present application.

Fig. 4 is a schematic structural diagram of a first pole piece included in a second stacked core and facing away from a first stacked core according to an exemplary embodiment of the present application.

Fig. 5 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application.

Fig. 6 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application.

Fig. 7 is a schematic structural diagram of an insulating layer according to an exemplary embodiment of the present application.

Fig. 8 is a schematic structural diagram of a composite unit according to an exemplary embodiment of the present application.

Fig. 9 is a schematic structural diagram of a battery according to an exemplary embodiment of the present application.

Reference numerals: an electric core 100; a first stack of cores 110; a second stacked core 120; a first pole piece A100; a second pole piece B100; a first tab A; a second tab B; a first current collector a110; a first polar active layer a120; a first diaphragm 130; a second diaphragm 140; an uncoated zone W; a composite unit 150; a third diaphragm 151; a fourth diaphragm 152; a battery 10; a housing 200; the thickness h1 of the first stacked core; the thickness h2 of the second stacked core; a length difference a; the width difference b.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

Fig. 1a is a schematic structural diagram of a battery cell according to an exemplary embodiment of the present disclosure. Fig. 1b is a schematic diagram illustrating a structure of the battery cell shown in fig. 1a in the N direction.

As shown in fig. 1a and fig. 1b, a battery cell 100 provided in an embodiment of the present application includes: the stacked core assembly comprises a first stacked core 110 and a second stacked core 120 which are arranged in a stacked manner, wherein each of the first stacked core 110 and the second stacked core 120 comprises a plurality of first pole pieces a100 and second pole pieces B100 which are arranged in an staggered manner, a projection of the first stacked core 110 on a plane parallel to the first pole pieces a100 is within a projection range of the second stacked core 120 on a plane parallel to the first pole pieces a100, each of the first stacked core 110 and the second stacked core 120 comprises a plurality of first pole lugs a and a plurality of second pole lugs B, a projection of the plurality of first pole lugs a included in the first stacked core 110 and a projection of the plurality of first pole lugs a included in the second stacked core 120 on a plane parallel to the first pole pieces a100 have an overlapping region, and a projection of the plurality of second pole lugs B included in the first stacked core 110 and a plurality of second pole lugs B included in the second stacked core 120 on a plane parallel to the first pole pieces a100 also have an overlapping region. The planar shapes of the first stacked core 110, the second stacked core 120, the first tab a and the second tab B may be rectangular.

In some embodiments, the first pole piece a100 is a positive pole piece; the second plate B100 is a negative plate. The first tab a represents a positive tab and the second tab B represents a negative tab. Wherein, the positive plate corresponds to the positive pole utmost point ear, and the negative pole piece corresponds to the negative pole utmost point ear.

In some embodiments, the projection of the first stacked core 110 on the plane parallel to the first pole piece a100 is within the projection range of the second stacked core 120 on the plane parallel to the first pole piece a100, that is, the shapes of the first stacked core 110 and the second stacked core 120 are different, so that the battery compartment structure with different shapes can be flexibly adapted, and development of intelligent products towards lightness and miniaturization is facilitated. In addition, the manufacturing process is simple, and mass production is easy to realize.

In some embodiments, the difference between the thickness h1 of the first stacked core 110 and the thickness h2 of the second stacked core 120 is greater than or equal to 0.3 mm, the length difference a between the first stacked core 110 and the second stacked core 120 is greater than or equal to 0 mm, the width difference b between the first stacked core 110 and the second stacked core 120 is greater than or equal to 0 mm, but the length difference a and the width difference b may not be equal to 0 mm at the same time.

Fig. 2 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application. As shown in fig. 2, in the battery cell 100 provided in the embodiment of the present application, the first pole piece a100 includes a first current collector a110 and a first polar active layer a120 coated on a surface of the first current collector a110, the first current collector a110 of the first pole piece a100, which is close to the second stacked core 120, corresponding to the first stacked core 110, and the first current collector a110 of the first pole piece a100, which is close to the first stacked core 110, corresponding to the second stacked core 120, are disposed opposite to each other.

In some embodiments, the relative disposition refers to the first current collector a110 of the first pole piece a100 adjacent to the second stacked core 120 corresponding to the first stacked core 110 being disposed adjacent to the first current collector a110 of the first pole piece a100 adjacent to the first stacked core 110 corresponding to the second stacked core 120.

In some embodiments, the first current collector a110 may be an aluminum foil, and the thickness of the first current collector a110 is greater than or equal to 10 microns.

The more positive plates that the battery cell 100 includes, the higher the charge capacity, for an equivalent battery case volume. Therefore, in the case of the same battery case volume, the first current collector a110 of the first pole piece a100 close to the second stacked core 120 corresponding to the first stacked core 110 is disposed opposite to the first current collector a110 of the first pole piece a100 close to the first stacked core 110 corresponding to the second stacked core 120, and the charge capacity of the battery cell 100 is high. Therefore, the first stacked core 110 and the second stacked core 120 provided by the embodiment of the present application improve the charge capacity of the battery cell 100.

In the battery cell 100 provided in the embodiment of the present application, the first current collector a110 corresponding to the first stacked core 110 and close to the second stacked core 120, and the first current collector a110 corresponding to the second stacked core 120 and close to the first stacked core 110 are bonded together by any one of a hot melt adhesive, a polypropylene adhesive, and a double-sided adhesive, so that the manufacturing process is simple, and the cost is low.

Fig. 3 is a schematic structural diagram of a first pole piece included in a first stacked core and facing away from a second stacked core according to an exemplary embodiment of the present application. As shown in fig. 3, the first stacked core 110 includes a first pole piece a100 facing away from the second stacked core 120, including a first current collector a110 and a first polarity active layer a120 coated on a side surface of the first current collector a110 close to the second stacked core 120.

Specifically, the first polarity active layer a120, i.e., the positive electrode active layer, includes ternary lithium, lithium iron phosphate, lithium cobaltate, lithium manganate, and the like, and the thickness of the first polarity active layer a120 is greater than or equal to 30 micrometers.

As shown in fig. 3, the battery cell 100 provided in the embodiment of the present application further includes: a first membrane 130 bonded to the first polar active layer a120 corresponding to the first pole piece a100 comprised by the first stacked core 110 facing away from the second stacked core 120.

Specifically, the first polar active layer a120 and the first separator 130 are bonded as one body through a hot pressing process.

In a non-charging and discharging state, the diaphragm is used for preventing short circuit; in the charge/discharge state, charged ions (e.g., lithium ions) are transferred through pores of the separator. Illustratively, in the charged state, lithium ions are transferred from the positive electrode to the negative electrode; in the discharged state, lithium ions are transferred from the negative electrode to the positive electrode.

Fig. 4 is a schematic structural diagram of a first pole piece included in a second stacked core and facing away from a first stacked core according to an exemplary embodiment of the present application. As shown in fig. 4, in the battery cell 100 provided in the embodiment of the present application, the second stacked core 120 includes a first pole piece a100 facing away from the first stacked core 110, and includes a first current collector a110 and a first polar active layer a120 coated on a surface of the first current collector a110 on a side close to the first stacked core 110. The battery cell 100 provided in the embodiment of the present application further includes: a second membrane 140 bonded to the first polar active layer a120 corresponding to the first pole piece a100 comprised by the second stacked core 120 facing away from the first stacked core 110.

As mentioned in the embodiment shown in fig. 2, the first stacked core 110 and the second stacked core 120 provided in the embodiments shown in fig. 3 and 4 further improve the charge capacity of the battery cell 100.

The first diaphragm 130 and the second diaphragm 140 have the same structure, and are different from each other in the position where they are provided. In addition, the diaphragm and the active layer are bonded into a whole through a hot pressing process.

In some embodiments, first membrane 130 and second membrane 140 each comprise a rubberized membrane or a ceramic coated membrane, the membranes having a thickness greater than or equal to 5 microns.

Fig. 5 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application. As shown in fig. 5, a projection of at least one side of the first stack core 110 on a plane parallel to the first pole piece a100 coincides with a projection of at least one side of the second stack core 120 on a plane parallel to the first pole piece a100, so as to ensure that boundaries of the first stack core 110 and the second stack core 120 are flush, and prevent the first stack core 110 and the second stack core 120 from shaking, thereby avoiding shell cracking caused by the shift of the first stack core 110 and the second stack core 120.

Fig. 6 is a schematic structural diagram of a battery cell according to another exemplary embodiment of the present application. As shown in fig. 6, the embodiment of the present application shows three other planar patterns of the first stacked core 110 and the second stacked core 120, i.e., the projections of the first stacked core 110 and the second stacked core 120 on a plane parallel to the first pole piece a 100. The embodiment of the present application does not further limit the projection of the first stacked core 110 and the second stacked core 120 on the plane parallel to the first pole piece a100, and can flexibly adapt to battery compartment structures with different shapes.

Fig. 7 is a schematic structural diagram of an insulating layer according to an exemplary embodiment of the present application. As shown in fig. 7, the first pole piece a100 includes a first current collector a110, and the surface of the first current collector a110 includes an uncoated area W near one end of the first tab a, and the uncoated area W is provided with an insulating layer.

Because of the pole piece forms through the section, there is the burr positive plate and negative pole piece's all around cut surface, especially positive pole utmost point ear department of positive plate produces the burr easily, and the burr pierces through behind diaphragm and the overlap joint negative pole piece, causes serious short circuit failure problem. Therefore, the uncoated region W of the first current collector a110 is provided with an insulating layer, the insulating layer has a width of greater than or equal to 3 mm, a length of equal to the length of the first current collector a110, and a thickness of greater than or equal to 10 μm, and the material of the insulating layer may be an insulating material such as ceramic, and thus the insulating layer serves to prevent short circuits.

Fig. 8 is a schematic structural diagram of a composite unit according to an exemplary embodiment of the present application. As shown in fig. 8, the battery cell 100 provided in the embodiment of the present application further includes: and a plurality of composite units 150, wherein the composite units 150 comprise a third diaphragm 151, a first pole piece A100, a fourth diaphragm 152 and a second pole piece B100 which are sequentially stacked and bonded with each other. In some embodiments, the portion of the third membrane 151 that extends beyond the first pole piece a100 is bonded to the portion of the fourth membrane 152 that extends beyond the first pole piece a 100. The third and fourth diaphragms 151 and 152 wrap the first pole piece a100 therein, so that the first pole piece a100 and the second pole piece B100 do not directly contact each other, thereby preventing the first pole piece a100 and the second pole piece B100 from short-circuiting in a non-charging and discharging state.

In some embodiments, the second pole piece B100 includes a second current collector and a second polarity active layer coated on a surface of the second current collector. The second current collector may be a copper foil, and the thickness of the second current collector is greater than or equal to 1 micron. The second polarity active layer, i.e., the negative electrode active layer, includes graphite or the like, and the thickness of the second polarity active layer is greater than or equal to 20 micrometers.

Fig. 9 is a schematic structural diagram of a battery according to an exemplary embodiment of the present application. As shown in fig. 9, an embodiment of the present application provides a battery 10, where the battery 10 includes a battery core 100 and a casing 200 as mentioned in any of the above embodiments. In some embodiments, the first pole piece a100 of the first stacked core 110 facing away from the second stacked core 120 includes a first current collector a110, the first current collector a110 is disposed opposite to the case 200, and/or the first pole piece a100 of the second stacked core 120 facing away from the first stacked core 110 includes the first current collector a110, and the first current collector a110 is disposed opposite to the case 200. Specifically, the first current collector a110 being disposed opposite the case 200 means that the first current collector a110 is disposed adjacent to the case 200.

The battery 10 mentioned in the embodiment of the application can flexibly adapt to different step-type battery compartment structures, and is beneficial to development of intelligent products towards the direction of lightness and miniaturization. The battery 10 referred to herein may be a lithium battery.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

The block diagrams of devices, apparatuses, devices, systems referred to in this application are only used as illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (14)

1. An electrical core, comprising:

the first stacked core and the second stacked core are arranged in a stacked manner, wherein the first stacked core and the second stacked core respectively comprise a plurality of first pole pieces and second pole pieces which are arranged in a staggered and stacked manner, the projection of the first stacked core on a plane parallel to the first pole pieces is within the projection range of the second stacked core on a plane parallel to the first pole pieces, the first stacked core and the second stacked core respectively comprise a plurality of first pole lugs and a plurality of second pole lugs, the projection of the first pole lugs contained in the first stacked core and the projection of the first pole lugs contained in the second stacked core on the plane parallel to the first pole pieces are provided with an overlapped area, and the projection of the second pole lugs contained in the first stacked core and the projection of the second pole lugs contained in the second stacked core on the plane parallel to the first pole pieces are also provided with an overlapped area.

2. The battery cell of claim 1, wherein the first pole piece comprises a first current collector and a first polar active layer coated on a surface of the first current collector, and the first current collector of the first pole piece adjacent to the second stacked core corresponding to the first stacked core is disposed opposite to the first current collector of the first pole piece adjacent to the first stacked core corresponding to the second stacked core.

3. The electrical core of claim 2, wherein the first current collector, which is close to the second stacked core and corresponds to the first stacked core, and the first current collector, which is close to the first stacked core and corresponds to the second stacked core, are bonded together by any one of a hot melt adhesive, a polypropylene adhesive, and a double-sided adhesive.

4. The cell of claim 1, wherein the first stacked core comprises the first pole piece facing away from the second stacked core, and comprises a first current collector and a first polar active layer coated on a side surface of the first current collector adjacent to the second stacked core.

5. The cell of claim 4, further comprising: a first membrane bonded to the first polar active layer corresponding to the first pole piece included in the first stacked core facing away from the second stacked core.

6. The cell of claim 1, wherein the first pole piece included in the second stacked core facing away from the first stacked core comprises a first current collector and a first polar active layer coated on a side surface of the first current collector adjacent to the first stacked core.

7. The cell of claim 6, further comprising: a second membrane bonded to the first polar active layer of the second stacked core corresponding to the first pole piece facing away from the first stacked core.

8. The electrical core of any of claims 1 to 7, wherein a projection of at least one side of the first stack of cores onto a plane parallel to the first pole piece coincides with a projection of at least one side of the second stack of cores onto a plane parallel to the first pole piece.

9. The cell of any of claims 1 to 7, wherein the first pole piece comprises a first current collector, a surface of the first current collector comprising an uncoated region proximate to one end of the first tab, the uncoated region being provided with an insulating layer.

10. The electrical core of any of claims 1 to 7, further comprising: the composite unit comprises a third diaphragm, a first pole piece, a fourth diaphragm and a second pole piece which are sequentially stacked and bonded with one another.

11. The electrical core of claim 10, wherein a portion of the third membrane that exceeds the first pole piece is bonded to a portion of the fourth membrane that exceeds the first pole piece.

12. The cell of claim 1, wherein,

the first pole piece is a positive pole piece;

the second pole piece is a negative pole piece.

13. A battery comprising a cell according to any of claims 1 to 12 and a casing.

14. The battery according to claim 13,

the first pole piece of the first folded core, which deviates from the second folded core, comprises a first current collector, the first current collector is arranged opposite to the shell, and/or

The second is folded the first pole piece that deviates from the first core of folding and is included first mass flow body, first mass flow body with the casing sets up relatively.

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