Single-sided pole piece, laminated battery cell and battery

Abstract

The utility model discloses a single-sided pole piece, a laminated cell and a battery, the single-sided pole piece is applied to the laminated cell, the laminated cell comprises a pole piece group and a diaphragm, the pole piece group is formed by laminating double-sided pole pieces, the single-sided pole piece is positioned on the outermost side of the pole piece group, the diaphragm is arranged between the single-sided pole piece and the pole piece group, the single-sided pole piece comprises a current collector, a current collector, a current collector and a current collector, the active material layer is arranged on one surface of the current collector; and the bonding layer is arranged on one surface, facing the diaphragm, of the active material layer, and the bonding layer comprises a first bonding strip arranged along the periphery of the active material layer. The single-sided pole piece disclosed by the utility model can be bonded with a diaphragm in the laminated battery cell through the bonding layer, particularly the first bonding strips arranged along the periphery of the active material layer in the bonding layer, so that the periphery of the single-sided pole piece is tightly attached in the laminated battery cell, the flatness is improved, lithium precipitation caused by warping in a later cycle process is prevented, and the service life of the single-sided pole piece is prolonged. And the cycle performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a single-sided pole piece, a laminated battery cell and a battery. Background Art

[0002] Lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in the electrochemical system and is widely used in digital products and other fields.

[0003] The mainstream types of lithium batteries on the market include wound type and stacked type. Among them, stacked batteries can better improve battery performance compared to wound batteries and have advantages in energy density, safety and other aspects.

[0004] At present, in laminated cells, the outermost layer of the cell is a single-sided electrode (i.e., only one side of the current collector of the electrode is coated with an active material layer), such as a single-sided cathode electrode or a single-sided anode electrode. Figure 1 As shown, the single-sided pole piece will warp significantly after rolling, resulting in loose fitting in the stacked battery cell. The loosely fitted area is prone to lithium deposition during the later cycle process, resulting in poor battery cell cycle performance. Utility Model Content

[0005] The main purpose of the utility model is to provide a single-sided pole piece, aiming to solve the technical problem that the single-sided pole piece is not tightly fitted in the stacked battery cell due to warping and lithium deposition is easy to occur.

[0006] To achieve the above-mentioned object, the utility model proposes a single-sided pole piece, which is applied to a laminated battery core. The laminated battery core includes a pole piece group and a diaphragm formed by stacking double-sided pole pieces. The single-sided pole piece is located at the outermost side of the pole piece group. The diaphragm is provided between the single-sided pole piece and the pole piece group. The single-sided pole piece includes:

[0007] current collector;

[0008] An active material layer is disposed on one side of the current collector;

[0009] The adhesive layer is arranged on a side of the active material layer facing the diaphragm, and the adhesive layer includes a first adhesive strip arranged along the periphery of the active material layer.

[0010] In some embodiments, the first adhesive strip forms a square frame along the periphery of the active material layer.

[0011] In some embodiments, the adhesive layer further comprises:

[0012] A second adhesive strip is located in the square frame and arranged along a diagonal line of the square frame.

[0013] In some embodiments, the adhesive layer further comprises:

[0014] a third adhesive strip, the third adhesive strip being located in the square frame and extending along the length direction of the square frame; and / or,

[0015] A fourth adhesive strip is located in the square frame and extends along the width direction of the square frame.

[0016] In some embodiments, a plurality of the third adhesive strips are arranged at intervals.

[0017] In some embodiments, a plurality of the fourth adhesive strips are arranged at intervals.

[0018] In some embodiments, the first adhesive strip includes a transverse adhesive portion and a vertical adhesive portion;

[0019] Wherein, the width of the transverse bonding portion accounts for 5% to 25% of the length of the active material layer; and / or the width of the vertical bonding portion accounts for 5% to 25% of the width of the active material layer.

[0020] In some embodiments, the thickness of the adhesive layer is 0.1 μm to 3 μm.

[0021] The utility model also proposes a laminated battery core, comprising a pole piece group formed by stacking double-sided pole pieces, a diaphragm and a single-sided pole piece, wherein the single-sided pole piece is located at the outermost side of the pole piece group, the diaphragm is arranged between the single-sided pole piece and the pole piece group, and the single-sided pole piece is the single-sided pole piece as described above.

[0022] The utility model also provides a battery, which comprises a shell and the laminated battery core as described above, wherein the laminated battery core is arranged in the shell.

[0023] The single-sided pole piece of the technical solution of the utility model is applied to a laminated battery cell. The laminated battery cell includes a pole piece group and a diaphragm formed by stacking double-sided pole pieces. The single-sided pole piece is located at the outermost side of the pole piece group. A diaphragm is provided between the single-sided pole piece and the pole piece group. The single-sided pole piece includes a current collector, an active material layer and an adhesive layer. The active material layer is provided on one side of the current collector, and the adhesive layer is provided on the side of the active material layer facing the diaphragm, and the adhesive layer includes a first adhesive strip provided along the periphery of the active material layer. The single-sided pole piece can be bonded to the diaphragm in the laminated battery cell through its adhesive layer, specifically the first adhesive strip provided along the periphery of the active material layer in the adhesive layer, so as to achieve a tight fit on all sides in the laminated battery cell, improve the flatness, and prevent lithium deposition in the later cycle process due to warping, thereby improving the cycle performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a stack of battery cells in the prior art;

[0025] Figure 2 It is a structural schematic diagram of a laminated battery core used for a single-sided electrode in one embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of a single-sided pole piece in an embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of a single-sided pole piece in another embodiment of the utility model;

[0028] Figure 5 This is a schematic structural diagram of a single-sided pole piece in yet another embodiment of the utility model;

[0029] Figure 6 This is a structural schematic diagram of a single-sided pole piece in another embodiment of the utility model;

[0030] Figure 7 This is a structural schematic diagram of a single-sided pole piece in another embodiment of the utility model;

[0031] Figure 8 This is a structural schematic diagram of a single-sided pole piece in another embodiment of the utility model;

[0032] Fig. 9 This is a structural schematic diagram of a single-sided pole piece in another embodiment of the utility model;

[0033] Fig.10 This is a schematic structural diagram of a single-sided pole piece in another embodiment of the utility model. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] like Figure 1 As shown, in the laminated battery cell, the single-sided pole piece 100 is usually arranged at the outermost side of the battery cell, and the current collector 110 thereof is coated with the active material layer 120 on only one side, and the active material layer 120 of the single-sided pole piece 100 faces the separator 300 of the laminated battery cell. The single-sided pole piece 100 will be warped significantly after rolling, resulting in a loose fit in the laminated battery cell. The loosely fitted area is prone to lithium deposition during the later cycle process, resulting in poor battery cell cycle performance.

[0039] Based on the above-mentioned problems currently existing, the embodiment of the utility model proposes a single-sided pole piece 100 to prevent the single-sided pole piece 100 from warping and causing lithium deposition in the later cycle process, thereby improving the cycle performance of the battery cell.

[0040] Reference Figures 2 to 4 In this embodiment, the single-sided pole piece 100 is applied to a laminated battery cell. The laminated battery cell includes a pole piece group formed by stacking double-sided pole pieces 200 and a diaphragm 300. The single-sided pole piece 100 is located at the outermost side of the pole piece group, and a diaphragm 300 is provided between the single-sided pole piece 100 and the pole piece group. Optionally, the diaphragm 300 is folded in a Z-shape, and several double-sided pole pieces 200 of the pole piece group are inserted into the diaphragm 300 and are stacked alternately with the diaphragm 300. Among them, the double-sided pole piece 200 involved has an active material layer coated on both sides of the current collector. Furthermore, both sides of the pole piece group have single-sided pole pieces 100, and a diaphragm 300 is provided between the single-sided pole piece 100 and the double-sided pole piece 200 in the pole piece group and adjacent to and opposite to it.

[0041] The single-sided electrode 100 includes a current collector 110, an active material layer 120 and an adhesive layer 130. The active material layer 120 is arranged on one side of the current collector 110, and the adhesive layer 130 is arranged on the side of the active material layer 120 facing the diaphragm 300. The adhesive layer 130 includes a first adhesive strip 131 arranged along the periphery of the active material layer 120.

[0042] The single-sided pole piece 100 may be a positive single-sided pole piece 100 or a negative single-sided pole piece 100, and there is no limitation on this. When the single-sided pole piece 100 is a positive single-sided pole piece 100, the current collector 110 may be made of aluminum foil, and the active material layer 120 may be made of a positive active coating material, such as lithium cobalt oxide, etc.; when the single-sided pole piece 100 is a negative single-sided pole piece 100, the current collector 110 may be made of copper foil, and the active material layer 120 may be made of a negative active coating material, such as graphite, etc.

[0043] The single-sided pole piece 100 is usually a square sheet, such as a rectangular sheet, and its length and width are not limited here. In the thickness direction of the single-sided pole piece 100, the current collector 110, the active material layer 120 and the bonding layer 130 are stacked in sequence, and the first bonding strip 131 included in the bonding layer 130 is arranged along the periphery of the active material layer 120. When the single-sided pole piece 100 is applied to a laminated battery cell, the single-sided pole piece 100 can be bonded to the diaphragm 300 through the first bonding strip 131 in the bonding layer 130, and then the four sides of the single-sided pole piece 100 are tightly attached to the diaphragm 300, so that the single-sided pole piece 100 is not easy to warp. In this embodiment, the bonding layer 130 is not fully coated on the active material layer 120, and it can be bonded to the diaphragm 300 through the first bonding strip 131 included, saving material costs while ensuring adhesion.

[0044] The first adhesive strip 131 of the adhesive layer 130 may be made of a polymer material. Specifically, the polymer may be one or a mixture of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) and polymethyl methacrylate (PMMA). In the actual manufacturing process, a solvent is mixed with the polymer to prepare an adhesive, and the adhesive is applied to the active material layer 120 to form the adhesive layer 130. The solvent used may be N-methylpyrrolidone, N,N-dimethylformamide (DMF), dimethylacetamide (DMAc) or tetrahydrofuran (THF), including but not limited to these. Optionally, the polymer content in the prepared solution may be 1% to 10%.

[0045] The single-sided electrode sheet 100 is set as the outermost layer when used in a stacked battery cell. The single-sided electrode sheet 100 can be bonded to the diaphragm 300 in the stacked battery cell through the adhesive layer 130, specifically the first adhesive strip 131 set along the periphery of the active material layer 120 in the adhesive layer 130, so as to achieve a tight fit on all sides in the stacked battery cell, improve the flatness, and prevent lithium deposition in the later cycle process due to warping, thereby improving the cycle performance of the battery cell.

[0046] In some embodiments, reference Figure 3 and Figure 4 , the first adhesive strip 131 forms a square frame along the periphery of the active material layer 120. In this embodiment, the first adhesive strip 131 is arranged in accordance with the outer contour of the single-sided electrode sheet 100 and is in a square frame shape. After being bonded to the diaphragm 300, the single-sided electrode sheet 100 can be closely attached to the diaphragm 300 around the periphery, so that the single-sided electrode sheet 100 is not easy to warp.

[0047] In some embodiments, reference Figure 5 , the adhesive layer 130 also includes: a second adhesive strip 132, the second adhesive strip 132 is located in the square frame and is arranged along the diagonal of the square frame. In this embodiment, in addition to the first adhesive strip 131, the adhesive layer 130 also includes a second adhesive strip 132, wherein the second adhesive strip 132 can be one, and one second adhesive strip 132 is arranged along one of the two diagonals of the square frame, or the second adhesive strip 132 can be two, and the two second adhesive strips 132 are respectively arranged along the two diagonals of the square frame, forming an "X" shape. Specifically, the two ends of the second adhesive strip 131 extend to a pair of corners of the square frame respectively, and are connected to the first adhesive strip 131. Optionally, the material composition of the second adhesive strip 132 can be set with reference to the material composition of the first adhesive strip 131, see the previous embodiment for details, and will not be repeated here. The adhesive layer 130 cooperates with the second adhesive strip 132 and the first adhesive strip 131 to bond with the diaphragm 300 of the laminated battery cell, which can further improve the tightness of the single-sided electrode 100, prevent lithium deposition in the later cycle process, and improve the cycle performance of the battery cell.

[0048] In some embodiments, reference Figures 6 to 8 , the adhesive layer 130 further includes:

[0049] A third adhesive strip 133, the third adhesive strip 133 is located in the frame and extends along the length direction of the frame; and / or,

[0050] The fourth adhesive strip 134 is located in the frame and extends along the width direction of the frame.

[0051] In this embodiment, optionally, Figure 6As shown, in addition to the first adhesive strip 131, the adhesive layer 130 further includes a third adhesive strip 133, which is disposed within the square frame and arranged along the length direction of the square frame. Specifically, both ends of the third adhesive strip 133 respectively extend to both ends of the square frame and are connected to the first adhesive strip 131. Among them, one third adhesive strip 133 may be provided. When only one third adhesive strip 133 is provided, it may be disposed on the center line in the width direction of the square frame. Optionally, the material composition of the third adhesive strip 133 may be set with reference to the material composition of the first adhesive strip 131. For details, refer to the foregoing embodiments and will not be repeated here. The adhesive layer 130 cooperates with the provided third adhesive strip 133 and the first adhesive strip 131 to bond to the separator 300 of the stacked battery cell, which can further improve the bonding tightness of the single-sided electrode sheet 100, prevent lithium deposition during the later cycling process, and improve the cycling performance of the battery cell.

[0052] In this embodiment, optionally, as Figure 7 shown, in addition to the first adhesive strip 131, the adhesive layer 130 further includes a fourth adhesive strip 134, which is disposed within the square frame and arranged along the width direction of the square frame. Specifically, both ends of the fourth adhesive strip 134 respectively extend to both sides of the square frame and are connected to the first adhesive strip 131. Among them, one fourth adhesive strip 134 may be provided. When only one fourth adhesive strip 134 is provided, it may be disposed on the center line in the length direction of the square frame. Optionally, the material composition of the fourth adhesive strip 134 may be set with reference to the material composition of the first adhesive strip 131. For details, refer to the foregoing embodiments and will not be repeated here. The adhesive layer 130 cooperates with the provided fourth adhesive strip 134 and the first adhesive strip 131 to bond to the separator 300 of the stacked battery cell, which can further improve the bonding tightness of the single-sided electrode sheet 100, prevent lithium deposition during the later cycling process, and improve the cycling performance of the battery cell.

[0053] As an alternative embodiment, as Figure 8 shown, the adhesive layer 130 may simultaneously include the third adhesive strip 133 and the fourth adhesive strip 134. Among them, as Fig.10 shown, when both the third adhesive strip 133 and the fourth adhesive strip 134 are provided as one, the third adhesive strip 133 and the fourth adhesive strip 134 intersect with each other and are combined with the first adhesive strip 131, presenting a "field" shape.

[0054] In some embodiments, with reference to Fig. 9, a plurality of third adhesive strips 133 are arranged at intervals. In this embodiment, a plurality of third adhesive strips 133 are arranged in sequence along the width direction of the frame. The number and spacing of the third adhesive strips 133 can be set with reference to the width of the third adhesive strips 133 and the width of the frame, which are not limited here. Optionally, a plurality of third adhesive strips 133 are evenly spaced, and the spacing between any adjacent third adhesive strips 133 is the same. The adhesive layer 130 is bonded to the diaphragm 300 of the laminated battery cell by arranging a plurality of third adhesive strips 133, which can improve the tightness of the single-sided electrode 100 and the diaphragm 300.

[0055] In some embodiments, reference Fig.10 , a plurality of fourth adhesive strips 134 are arranged at intervals. In this embodiment, a plurality of fourth adhesive strips 134 are arranged in sequence along the length direction of the square frame. The number and spacing of the fourth adhesive strips 134 can be set with reference to the width of the fourth adhesive strips 134 and the length of the square frame, which are not limited here. Optionally, a plurality of fourth adhesive strips 134 are evenly spaced, and the spacing between any adjacent fourth adhesive strips 134 is the same. The adhesive layer 130 is bonded to the diaphragm 300 of the laminated battery cell by arranging a plurality of fourth adhesive strips 134, which can improve the tightness of the single-sided electrode 100 and the diaphragm 300.

[0056] In some embodiments, reference Figure 4 , the first adhesive strip 131 includes a transverse adhesive portion 1311 and a vertical adhesive portion 1312;

[0057] The width of the transverse bonding portion 1311 accounts for 5% to 25% of the length of the active material layer 120 ; and / or the width of the vertical bonding portion 1312 accounts for 5% to 25% of the width of the active material layer 120 .

[0058] In this embodiment, the first adhesive strip 131 has two transverse adhesive portions 1311 and two vertical adhesive portions 1312. The two transverse adhesive portions 1311 are respectively located at the upper and lower ends of the active material layer 120 along the length direction, and the two vertical adhesive portions 1312 are respectively located at the left and right edges of the active material layer 120 along the width direction.

[0059] Optionally, the width of the transverse bonding portion 1311 accounts for 5% to 25% of the length of the active material layer 120. For example, when the length of the active material layer 120 is 80 mm, the width of the transverse bonding portion 1311 can be set to 4 mm to 20 mm. Further, the width of the transverse bonding portion 1311 can be set with reference to the degree of warping of the single-sided pole piece 100. For example, when the degree of warping of the single-sided pole piece 100 is small, the width of the transverse bonding portion 1311 can be set to 5% of the length of the active material layer 120; when the degree of warping of the single-sided pole piece 100 is medium, the width of the transverse bonding portion 1311 can be set to 15% of the length of the active material layer 120; when the degree of warping of the single-sided pole piece 100 is large, the width of the transverse bonding portion 1311 can be set to 25% of the length of the active material layer 120.

[0060] Optionally, the width of the vertical adhesive portion 1312 accounts for 5% to 25% of the width of the active material layer 120. For example, when the width of the active material layer 120 is 60 mm, the width of the vertical adhesive portion 1312 can be set to 3 mm to 15 mm. Further, the width of the vertical adhesive portion 1312 can be set with reference to the degree of warping of the single-sided pole piece 100. For example, when the degree of warping of the single-sided pole piece 100 is small, the width of the vertical adhesive portion 1312 can be set to 5% of the width of the active material layer 120; when the degree of warping of the single-sided pole piece 100 is medium, the width of the vertical adhesive portion 1312 can be set to 15% of the width of the active material layer 120; when the degree of warping of the single-sided pole piece 100 is large, the width of the vertical adhesive portion 1312 can be set to 25% of the width of the active material layer 120.

[0061] In some embodiments, the thickness of the adhesive layer 130 is 0.1 μm to 3 μm. In this embodiment, the thickness of the adhesive layer 130 can be set within the range of 0.1 μm to 3 μm, for example, the thickness of the adhesive layer 130 can be set to 0.1 μm, 1.55 μm or 3 μm. Optionally, the thickness of the adhesive layer 130 can be set with reference to the degree of warping of the single-sided pole piece 100. For example, when the degree of warping of the single-sided pole piece 100 is small, the thickness of the adhesive layer 130 can be set to 0.1 μm; when the degree of warping of the single-sided pole piece 100 is medium, the thickness of the adhesive layer 130 can be set to 1.55 μm; when the degree of warping of the single-sided pole piece 100 is large, the thickness of the adhesive layer 130 can be set to 3 μm.

[0062] The utility model also proposes a laminated battery cell, which includes a pole piece group formed by stacking double-sided pole pieces 200, a diaphragm 300 and a single-sided pole piece 100, wherein the single-sided pole piece 100 is located at the outermost side of the pole piece group, and a diaphragm 300 is provided between the single-sided pole piece 100 and the pole piece group, and the single-sided pole piece 100 is the single-sided pole piece 100 as described in the above-mentioned embodiment. The specific structure of the single-sided pole piece 100 refers to the above-mentioned embodiment. Since the laminated battery cell adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. In the laminated battery cell of this embodiment, the single-sided pole piece 100 can be a positive single-sided pole piece 100 or a negative single-sided pole piece 100, and there is no limitation on this.

[0063] The utility model also provides a battery, which includes a housing and a laminated battery core as described in the above embodiment, and the laminated battery core is arranged in the housing. The specific structure of the laminated battery core refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0064] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A single-sided pole piece, applied to a laminated battery core, the laminated battery core comprises a pole piece group and a diaphragm formed by stacking double-sided pole pieces, the single-sided pole piece is located at the outermost side of the pole piece group, and the diaphragm is arranged between the single-sided pole piece and the pole piece group, characterized in that: The single-sided pole piece comprises: current collector; An active material layer is disposed on one side of the current collector; The adhesive layer is arranged on a side of the active material layer facing the diaphragm, and the adhesive layer includes a first adhesive strip arranged along the periphery of the active material layer.

2. The single-sided pole piece according to claim 1, characterized in that: The first adhesive strip forms a square frame along the periphery of the active material layer.

3. The single-sided pole piece according to claim 2, characterized in that: The bonding layer further comprises: A second adhesive strip is located in the square frame and arranged along a diagonal line of the square frame.

4. The single-sided pole piece according to claim 2, characterized in that: The bonding layer further comprises: a third adhesive strip, the third adhesive strip being located in the square frame and extending along the length direction of the square frame; and / or, A fourth adhesive strip is located in the square frame and extends along the width direction of the square frame.

5. The single-sided pole piece according to claim 4, characterized in that: A plurality of the third adhesive strips are arranged at intervals.

6. The single-sided pole piece according to claim 4, characterized in that: A plurality of the fourth adhesive strips are arranged at intervals.

7. The single-sided pole piece according to claim 2, characterized in that: The first adhesive strip includes a transverse adhesive portion and a vertical adhesive portion; Wherein, the width of the transverse bonding portion accounts for 5% to 25% of the length of the active material layer; and / or the width of the vertical bonding portion accounts for 5% to 25% of the width of the active material layer.

8. The single-sided pole piece according to claim 1, characterized in that: The thickness of the adhesive layer is 0.1 μm to 3 μm.

9. A laminated battery cell, comprising a pole piece group formed by stacking double-sided pole pieces, a diaphragm and a single-sided pole piece, wherein the single-sided pole piece is located at the outermost side of the pole piece group, and the diaphragm is arranged between the single-sided pole piece and the pole piece group, characterized in that: The single-sided pole piece is the single-sided pole piece as described in any one of claims 1-8.

10. A battery, characterized in that: It comprises a shell and the laminated battery core as claimed in claim 9, wherein the laminated battery core is arranged in the shell.

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