Battery cell, battery and electric equipment

Abstract

The utility model discloses a battery cell, a battery and electric equipment. The battery cell comprises a first pole piece, a second pole piece and an isolating membrane, the first pole piece comprises a first current collector and first active substances, the first active substances are arranged on the two surfaces of the first current collector in the thickness direction of the first current collector, the first pole piece comprises an empty foil section, and the empty foil section is provided with an empty foil area; the second pole piece comprises a second current collector and second active substances, and the second active substances are arranged on the two surfaces of the second current collector in the thickness direction of the second current collector; the isolating membrane is stacked between the first pole piece and the second pole piece, and at least one surface of the empty foil section is adhered to the isolating membrane. The isolation film is arranged on the hollow foil section to connect the isolation film and the hollow foil section into a whole, so that the isolation film can be used for supporting the hollow foil section to a certain extent to reduce the deformability of the hollow foil section, the wrinkle degree of the hollow foil section is reduced, and the surface plane of the hollow foil section is smoother. Therefore, when the battery cell provided by the embodiment is used for the battery, the risk of separating out lithium at the empty foil section can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of electric core, battery and electric equipment. BACKGROUND

[0002] People pursue higher endurance capability to mobile phone, notebook computer and other 3C electronic products, and battery is the key of endurance, in prior art, to improve the energy density of battery, current collector is made thinner and thinner, for example, lithium battery, for anode sheet, in winding, copper foil in inner circle single surface area is prone to wrinkle in empty foil area due to tension problem, and lithium is precipitated at wrinkle after long cycle. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a kind of electric core, can make empty foil area more flat, reduce battery lithium precipitation risk.

[0004] The utility model further provides a kind of battery comprising above-mentioned electric core.

[0005] The utility model further provides a kind of electric equipment comprising above-mentioned battery.

[0006] According to the electric core of the first aspect embodiment of the utility model, it includes: first pole piece, second pole piece and isolation film.

[0007] The first pole piece includes first current collector and first active material, the first active material is arranged on the two surfaces of the first current collector along the thickness direction of itself, and the first current collector has empty foil section on one side along the length direction of itself, the empty foil section includes first surface and second surface opposite along the thickness direction of itself, at least one of the first surface and the second surface is empty foil area not covered by the first active material;The isolation film is stacked between the first pole piece and the second pole piece, and is co-wound with the first pole piece and the second pole piece to form the electric core;The empty foil section is located at the innermost side of the electric core, and at least one of the first surface and the second surface is bonded to the isolation film.

[0008] According to the electric core of the utility model embodiment, at least has following beneficial effects:

[0009] In the embodiment, at least one surface of the empty foil section of the first pole piece is bonded to the corresponding isolation film, to connect the isolation film and the empty foil section as a whole, so that the isolation film can form a certain support for the empty foil section, to reduce the deformation ability of the empty foil section, thereby reducing the wrinkle degree of the empty foil section, making the surface plane of the empty foil section more flat.Therefore, when the electric core of the embodiment is used in battery, the lithium precipitation risk in empty foil section can be reduced.

[0010] According to some embodiments of the present application, the first surface is the empty foil area, and the first surface is bonded to the isolation film.

[0011] According to some embodiments of the present application, the second surface is provided with the first active substance, and the battery cell further comprises a first adhesive, the first adhesive has pores for ions to pass through, and the first adhesive is arranged between the first active substance and the isolation film to bond the isolation film to the first active substance.

[0012] According to some embodiments of the present application, the battery cell comprises a plurality of adhesive segments, the plurality of adhesive segments are arranged at intervals along the winding direction of the first tab and arranged in the empty foil segment, and the plurality of adhesive segments are used to bond the isolation film to the empty foil segment.

[0013] Along the thickness direction of the battery cell, a projection of the first tab on the empty foil segment is located between two adjacent adhesive segments; and / or,

[0014] Along the thickness direction of the battery cell, a projection of the second tab on the empty foil segment is located between two adjacent adhesive segments.

[0015] According to some embodiments of the present application, the empty foil segment is wound to form a first flat segment and a first curved segment, the isolation film has a second flat segment corresponding to the first flat segment in position, and a second curved segment corresponding to the first curved segment in position.

[0016] The first flat segment is bonded to the second flat segment, and the first curved segment abuts against the second curved segment.

[0017] According to some embodiments of the present application, the battery cell comprises an adhesive, and the adhesive is dot-matrix distributed on the empty foil segment to bond the isolation film to the empty foil segment.

[0018] According to some embodiments of the present application, the empty foil segment further comprises a double-sided empty foil segment which does not cover the first active substance on both sides along the thickness direction of the double-sided empty foil segment, and both surfaces of the double-sided empty foil segment along the thickness direction thereof are bonded to the isolation film.

[0019] The battery according to the second aspect of the present application comprises the battery cell according to the first aspect of the present application.

[0020] The battery according to the present application has at least the following beneficial effects:

[0021] The at least one surface of the empty foil section of the battery cell is bonded to the corresponding isolation film, so as to connect the isolation film and the empty foil section into an integrated whole, thereby forming certain support for the empty foil section by the isolation film, reducing the deformation ability of the empty foil section, and thus reducing the degree of folding of the empty foil section, so that the surface plane of the empty foil section is more flat. Therefore, the risk of lithium precipitation in the empty foil section during the operation of the battery of the embodiment can be reduced.

[0022] According to some embodiments of the present application, the side of the isolation film away from the second surface is bonded to the second pole piece.

[0023] According to the third aspect of the present application, the battery cell of the third aspect of the present application is used in the battery cell of the second aspect of the present application.

[0024] According to the third aspect of the present application, the battery cell of the third aspect of the present application is used in the battery cell of the second aspect of the present application.

[0025] The at least one surface of the empty foil section of the battery cell is bonded to the corresponding isolation film, so as to connect the isolation film and the empty foil section into an integrated whole, thereby forming certain support for the empty foil section by the isolation film, reducing the deformation ability of the empty foil section, and thus reducing the degree of folding of the empty foil section, so that the surface plane of the empty foil section is more flat. Therefore, the risk of lithium precipitation in the empty foil section during the operation of the battery of the embodiment can be reduced.

[0026] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0028] Figure 1 The structure of the first battery cell of the first aspect of the present application is shown in the figure;

[0029] Figure 2 The structure of the second battery cell of the first aspect of the present application is shown in the figure;

[0030] Figure 3 The structure of the third battery cell of the first aspect of the present application is shown in the figure;

[0031] Figure 4 The structure of the fourth battery cell of the first aspect of the present application is shown in the figure.

[0032] Reference signs:

[0033] The first tab 100, the empty foil area 101, the first current collector 110, the first active material 120, the empty foil segment 130, the first surface 131, the second surface 132, the first flat segment 133, the first curved segment 134;

[0034] The second tab 200, the second current collector 210, the second active material 230;

[0035] The isolation film 300, the second flat segment 310, the second curved segment 320;

[0036] The adhesive 400, the first adhesive 410, the second adhesive 420;

[0037] The first tab 500, the second tab 600. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0039] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0040] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0041] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0042] With the advent of the 5G intelligent era, people pursue higher endurance for 3C electronic products such as mobile phones and laptops, and the battery is the key to endurance. In the prior art, in order to improve the energy density of the battery, the current collector is made thinner and thinner. For example, for a lithium battery, the copper foil in the inner circle single-face area of the anode sheet is prone to wrinkling due to tension problems during winding, which can lead to lithium precipitation at the wrinkled area after long cycling.

[0043] Battery lithium precipitation can have many adverse effects on the battery, such as:

[0044] Battery capacity decay: Lithium precipitation can cause some lithium ions to form lithium metal on the surface of the anode sheet instead of being embedded in the anode sheet material. This means that the number of active lithium ions available for charging and discharging decreases, resulting in a decrease in battery capacity. The growth of lithium dendrites can further reduce battery capacity because they can penetrate the separator membrane, causing internal short circuits in the battery and reducing available capacity.

[0045] Increased safety risk: Severe lithium precipitation can cause internal short circuits in the battery, leading to thermal runaway and even catastrophic consequences such as fire or explosion. This is because lithium dendrites can penetrate the separator membrane, causing direct contact between the positive and negative anode sheets, resulting in a large amount of heat and current. This safety risk poses a serious threat to the life and property safety of users.

[0046] Accelerated battery aging: The lithium precipitation reaction can accelerate the aging process of the battery. The metal lithium generated in the lithium deposition side reaction reacts with the electrolyte to form a solid-state electrolyte interface (SEI) film, which not only causes a decrease in coulombic efficiency but also changes the internal structure of the battery, further accelerating the aging of the battery.

[0047] In view of the above background, the first aspect embodiment of the utility model provides a kind of electric core, the flatness of the empty foil area 101 of electric core is higher, and electric core can be used in battery, to reduce battery lithium precipitation. This embodiment is explained and described by taking lithium battery as an example, but is not limited to lithium battery, and can also be lead-acid battery, nickel-cadmium battery or nickel-hydrogen battery. Refer to Figure 1 , Figure 1 The structure diagram of the first electric core of the first aspect embodiment of the utility model, the electric core of this embodiment includes: first pole piece 100, second pole piece 200 and separator membrane 300.

[0048] The first pole piece 100 includes a first current collector 110 and a first active material 120, the first active material 120 is arranged on both surfaces of the first current collector 110 along the thickness direction of the first current collector 110, and the first current collector 110 has a hollow foil section 130 on one side along the length direction of the first current collector 110, the hollow foil section 130 includes a first surface 131 and a second surface 132 which are opposite to each other along the thickness direction of the hollow foil section 130, and at least one of the first surface 131 and the second surface 132 is a hollow foil area 101 which is not covered by the first active material 120. The second pole piece 200 includes a second current collector 210 and a second active material 230, the second active material 230 is arranged on both surfaces of the second current collector 210 along the thickness direction of the second current collector 210. The first pole piece 100 is, for example, an anode pole piece, and correspondingly, the first current collector 110 is, for example, a copper foil, and the first active material 120 is graphite. The second pole piece 200 is a cathode pole piece, the second current collector 210 is, for example, an aluminum foil, and the second active material 230 is a lithium ion compound such as lithium cobalt oxide (LiCoO2), lithium manganate (LiMnO4) or lithium iron phosphate (LiFePO4). In addition, the first pole piece 100 can also be an anode pole piece, and the second pole piece 200 is a cathode pole piece. The separator 300 is arranged between the first pole piece 100 and the second pole piece 200 and is co-wound with the first pole piece 100 and the second pole piece 200 to form a battery cell, the hollow foil section 130 is located at the innermost side of the battery cell, and at least one of the first surface 131 and the second surface 132 is bonded to the separator 300. For example, the first surface 131 is bonded to the separator 300, or the second surface 132 is bonded to the separator 300, or both the first surface 131 and the second surface 132 are bonded to the separator 300.

[0049] Specifically, at least one surface of the hollow foil section 130 of the first pole piece 100 is bonded to the corresponding separator 300, so as to connect the separator 300 and the hollow foil section 130 into one body, thereby being able to form a certain support for the hollow foil section 130 by the separator 300, so as to reduce the deformation ability of the hollow foil section 130, thereby reducing the degree of folding of the hollow foil section 130 and making the surface plane of the hollow foil section 130 more flat. Therefore, when the battery cell of the present embodiment is used in a battery, the risk of lithium precipitation in the hollow foil section 130 can be reduced.

[0050] Reference Figure 1In the above embodiment, the first surface 131 is the empty foil area 101, and the first surface 131 is bonded to the isolation film 300. Specifically, it can be known that the working principle of the battery is the reversible migration of lithium ions between the positive anode sheet. Taking a lithium battery as an example, the charging process is that lithium ions are separated from the cathode sheet. The separated lithium ions migrate to the anode sheet through the electrolyte. The discharging process is that lithium ions are separated from the anode sheet and return to the cathode sheet through the electrolyte. In the present embodiment, the empty foil area 101 of the first anode sheet 100 is not provided with the first active material 120 and does not participate in the redox reaction, that is, there is no ion migration in the empty foil area 101. Therefore, when the first surface 131 serving as the empty foil area 101 in the present embodiment is bonded to the isolation film 300, the adhesive layer (specifically, the second adhesive 420 in the drawing) for bonding the isolation film 300 and the first surface 131 will not hinder the migration of ions in the charging and discharging process of the battery. Based on this, when the battery is used with the battery cell in the present embodiment, the battery can have a lower impedance and improve the performance of the battery.

[0051] With reference to Figure 2 , Figure 2 FIG. 2 is a structural schematic diagram of a second battery cell according to a first aspect of the present application. In some embodiments, the second surface 132 is provided with the first active material 120, and the battery cell further comprises a first adhesive 410, which is arranged between the first active material 120 and the isolation film 300 to bond the isolation film 300 to the first active material 120. For example, the first adhesive 410 is a structure with pores made of one or more materials such as polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), or polyethylene oxide (PEO), and the pores are used for the ions to pass through, thereby reducing the hindrance of the first adhesive 410 to the ion migration. Based on this, when the battery is used with the battery cell in the present embodiment, the battery can have a lower impedance and improve the energy density of the battery.

[0052] Similarly, in some embodiments, the empty foil segment 130 further comprises a double-sided empty foil segment 130 which is not covered with the first active material 120 on both surfaces in the thickness direction of the double-sided empty foil segment 130, and both surfaces of the double-sided empty foil segment 130 in the thickness direction are bonded to the isolation film 300, which will not be described herein again.

[0053] With reference to Figure 2In some embodiments, the first surface 131 is the empty foil area 101, and the first surface 131 is bonded to the isolation film 300. The second surface 132 is provided with the first active material 120, and the battery cell further comprises a first bonding glue 410 provided between the second surface 132 and the isolation film 300 to bond the isolation film 300 to the first active material 120, and the first bonding glue 410 has pores for allowing ions to pass through. Specifically, in the present embodiment, the first surface 131 and the second surface 132 of the empty foil segment 130 are both connected to the isolation film 300, that is, the two layers of the isolation film 300 are bonded to the empty foil segment 130 to form an integrated structure, thereby further reducing the deformation ability of the empty foil segment 130, and thus reducing the degree of folding of the empty foil area 101. Therefore, when the battery cell of the present embodiment is used in a battery, the risk of lithium precipitation in the battery during operation can be further reduced under the premise of ensuring that the battery has a lower impedance.

[0054] Further, in some embodiments, the side of the isolation film 300 away from the second surface 132 is bonded to the second tab 200, that is, the empty foil segment 130, the isolation film 300 and the second tab 200 are bonded to form an integrated structure, which can further reduce the deformation ability of the empty foil segment 130, thereby further reducing the risk of lithium precipitation in the battery, which will not be described here.

[0055] Referring to Figure 3 , Figure 3In some embodiments, the structure of the third kind of battery cell is shown in the structure diagram of the first aspect of the utility model, the battery cell comprises a plurality of sections of adhesive 400, the plurality of sections of adhesive 400 are arranged at the hollow foil section 130 along the winding direction of the first pole piece 100, and are used to bond the isolation film 300 to the hollow foil section 130. The adhesive 400 is, for example, the first adhesive 410 and / or the second adhesive 420 in the above embodiments. The battery cell further comprises a first tab 500 and a second tab 600, the first tab 500 is connected to the first pole piece 100, the second tab 600 is connected to the second pole piece 200, and the battery cell has a set thickness. Along the thickness direction of the battery cell, the projection of the first tab 500 on the hollow foil section 130 is located between the two adjacent adhesives 400. Specifically, it can be understood that the isolation film 300 is bonded to the hollow foil section 130 by the adhesive 400, (the adhesive 400 is the first adhesive 410 bonding the second surface 132 of the isolation film 300 and the second adhesive 420 bonding the first surface 131 of the isolation film 300), and the adhesive has a certain thickness. Correspondingly, the first tab 500 is connected to the first pole piece 100, for example, the first tab 500 is welded to the first tab 500, and the surface of the first tab 500 needs to be attached with a glue layer to prevent the edge or burr of the first tab 500 from cutting the isolation film 300, thereby causing the thickness of the battery cell at the welding position of the first tab 500 to be relatively large. In the present embodiment, along the thickness direction of the battery cell, the projection of the first tab 500 on the hollow foil section 130 is located between the two adjacent adhesives 400, that is, the first tab 500 is arranged staggered with the adhesive 400, thereby avoiding the superposition of the influence of the adhesive 400 and the second tab 600 on the thickness of the battery cell, reducing the volume of the battery cell, and thereby improving the energy density of the battery. Similarly, in some embodiments, along the thickness direction of the battery cell, the projection of the second tab 600 on the hollow foil section 130 is located between the two adjacent adhesives 400, which will not be described here.

[0056] Referring to Figure 4In some embodiments, the first flat section 133 and the first curved section 134 are formed by winding the empty foil section 130, the isolation film 300 has a second flat section 310 corresponding to the first flat section 133, and a second curved section 320 corresponding to the first curved section 134. The first flat section 133 is bonded to the second flat section 310, and the first curved section 134 abuts the second curved section 320. Specifically, the first flat section 133 corresponds to one side of the thickness direction of the battery cell, and the curved section corresponds to one side of the width direction of the battery cell. It can be understood that, due to the winding process, the pole piece needs to be clamped by a winding needle during winding, and the winding needle needs to be pulled out after winding. After the winding needle is pulled out, the battery cell will be loose in the thickness direction of the battery cell, that is, the first flat section 133 of the empty foil section 130 is in a relaxed state. The first curved section 134 has a relatively small size and is in a bent and tight state, so the first flat section 133 is more prone to wrinkles, and the first curved section 134 is less prone to wrinkles. Based on this, the first flat section 133 and the second flat section 310 are bonded in the embodiment, and the first curved section 134 abuts the second curved section 320, that is, the first curved section 134 and the second curved section 320 are not bonded, and there is no need to set an adhesive between the first curved section 134 and the second curved section 320, thereby reducing the influence of the adhesive on the volume of the battery cell, and further improving the energy density of the battery when the battery cell of the embodiment is used in the battery.

[0057] In some embodiments, the battery cell includes a first adhesive 410, which is dot-matrix distributed on the empty foil section 130, and is used to bond the isolation film 300 to the empty foil section 130. Specifically, in the embodiment, the bonding between the empty foil section 130 and the isolation film 300 can be achieved by the dot-matrix distributed first adhesive 410, without the need to coat the entire surface of the empty foil section 130 with an adhesive, thereby reducing the amount of adhesive used, which not only reduces the use cost of the battery cell, but also improves the energy density of the battery.

[0058] The battery according to the second aspect of the embodiment of the utility model comprises the battery cell of the first aspect. Specifically, the battery comprises a shell, for example, an aluminum plastic film, a steel shell, or an aluminum shell, etc., and the battery cell is arranged in the shell. At least one surface of the empty foil section 130 of the battery cell is bonded to the corresponding isolation film 300, so as to connect the isolation film 300 and the empty foil section 130 into one body, thereby being able to form a certain support for the empty foil section 130 by the isolation film 300, so as to reduce the deformation ability of the empty foil section 130, thereby reducing the wrinkle degree of the empty foil section 130, and making the surface plane of the empty foil section 130 more flat. Therefore, the risk of lithium precipitation in the empty foil section 130 during the working process of the battery of the embodiment can be reduced.

[0059] It should be noted that, since the first aspect embodiment is adopted in the battery cell of the embodiment, the embodiment has all the beneficial effects brought by the first aspect embodiment.

[0060] According to the third aspect embodiment of the utility model, the power equipment is, for example, a mobile phone, a watch, a bracelet, or a new energy electric vehicle, and the power equipment comprises the battery of the second aspect embodiment. At least one surface of the empty foil section 130 of the battery cell inside the battery is bonded with the corresponding isolation film 300, so as to connect the isolation film 300 and the empty foil section 130 into one body. Thus, the empty foil section 130 can be supported by the isolation film 300 to reduce the deformation ability of the empty foil section 130, thereby reducing the degree of folding of the empty foil section 130, making the surface plane of the empty foil section 130 more flat, and further reducing the risk of lithium precipitation in the empty foil section 130 in the battery working process, so as to improve the performance of the power equipment of the embodiment.

[0061] The utility model has been described in detail in combination with the drawings, but the utility model is not limited to the above-embodiment, and within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the utility model. In addition, in the description of the utility model, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An electric cell, characterized by, The battery includes: a first electrode sheet including a first current collector and a first active material, the first active material being disposed on both surfaces of the first current collector along a thickness direction of the first current collector, and the first current collector having a hollow foil segment on one side of the first current collector along a length direction of the first current collector, the hollow foil segment including a first surface and a second surface opposite to each other along a thickness direction of the hollow foil segment, at least one of the first surface and the second surface being a hollow foil region not covered by the first active material; a second electrode sheet; a separator film stacked between the first electrode sheet and the second electrode sheet and co-wound with the first electrode sheet and the second electrode sheet to form the battery cell; wherein the hollow foil segment is located at an innermost side of the battery cell, and at least one of the first surface and the second surface is bonded to the separator film.

2. The electric cell of claim 1, wherein, The first surface is the hollow foil region, and the first surface is bonded to the separator film.

3. The cell of claim 1 or 2, wherein, The second surface is provided with the first active material, and the battery cell further includes a first adhesive having pores for allowing ions to pass through, the first adhesive being disposed between the first active material and the separator film to bond the separator film to the first active material.

4. The electric cell of claim 1, wherein, The battery cell includes a plurality of adhesive segments spaced apart along a winding direction of the first electrode sheet at the hollow foil segment to bond the separator film to the hollow foil segment, and the battery cell further includes a first tab connected to the first electrode sheet and a second tab connected to the second electrode sheet, the battery cell having a set thickness; in a thickness direction of the battery cell, a projection of the first tab on the hollow foil segment is located between two adjacent adhesive segments; and / or in the thickness direction of the battery cell, a projection of the second tab on the hollow foil segment is located between two adjacent adhesive segments.

5. The electric cell of claim 1, wherein, The hollow foil segment is co-wound to form a first straight segment and a first curved segment, and the separator film has a second straight segment corresponding to the first straight segment and a second curved segment corresponding to the first curved segment; the first straight segment is bonded to the second straight segment, and the first curved segment abuts the second curved segment.

6. The electric cell of claim 1, wherein, The battery cell includes an adhesive, and the adhesive is dot-matrix distributed on the hollow foil segment to bond the separator film to the hollow foil segment.

7. The electric cell of claim 1, wherein, The hollow foil segment further includes a double-sided hollow foil segment not covered by the first active material on both surfaces of the double-sided hollow foil segment along a thickness direction of the double-sided hollow foil segment, and both surfaces of the double-sided hollow foil segment are bonded to the separator film.

8. The electric cell of claim 1, wherein, A side of the separator film away from the second surface is bonded to the second electrode sheet.

9. A battery characterized by The battery includes the battery cell of any one of claims 1 to 8.

10. An electrical device, characterized by The battery includes the battery of claim 9.

Images