Battery assembly, battery using the battery assembly, and electronic device

Abstract

A battery assembly includes: a first pole piece, the first pole piece includes a first current collector and a first active layer, the first active layer is arranged on the surface of the first current collector; a first region, the first region is arranged at one end of the battery assembly, and the thickness of the first active layer located in the first region is h1; a second region, the second region extends from the first region, and the thickness of the first active layer located in the second region is h2, and h1 is less than h2; a flat piece, the flat piece is arranged in the first region, and the flat piece is arranged on the surface of the first active layer away from the first current collector. A battery and an electronic device using the battery assembly are also provided. The battery assembly can improve flatness and reduce safety risks.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly, a battery using the battery assembly, and an electronic device. Background Art

[0002] Secondary batteries are increasingly used in various fields. Secondary batteries generally include a jelly-roll electrode assembly or a stacked electrode assembly. The jelly-roll electrode assembly has the following structure: a long plate-shaped positive electrode and a long plate-shaped negative electrode of the active material are wound with a separator disposed between the positive electrode and the negative electrode; the stacked electrode assembly has the following structure: a plurality of positive electrodes of a predetermined size and a plurality of negative electrodes of a predetermined size are stacked successively with a separator each interposed between the positive electrode and the negative electrode.

[0003] Current secondary batteries often go through a thinning process during coating, and the degree of thinning is difficult to control. For L-type batteries, the thinning area is located at the head of the cell, causing the head of the L-type stacked cell to be thinner than the main body. During the formation stage of battery manufacturing, insufficient pressure is applied to the head area of ​​the cell, resulting in weak adhesion and poor interface between the electrode and the diaphragm in this area. As the cycle progresses, lithium deposition occurs in the head area of ​​the cell, causing the head to bulge and the cell thickness to be abnormal, which in turn has an adverse effect on safety performance.

[0004] How to solve the above problems is what those skilled in the art need to consider. Summary of the invention

[0005] In order to solve the problem in the prior art that insufficient pressure is applied to the head area of ​​the battery cell, resulting in weak adhesion and poor interface between the electrode and the diaphragm in this area, as well as lithium deposition resulting in bulging of the head and abnormal thickness of the battery cell.

[0006] The present application provides a battery assembly, including:

[0007] A first pole piece, the first pole piece comprising a first current collector and a first active layer, the first active layer being disposed on a surface of the first current collector;

[0008] A first region, wherein the first region is disposed at one end of the battery assembly, and the thickness of the first active layer located in the first region is h1;

[0009] a second region, the second region extending from the first region, the first active layer in the second region having a thickness of h2, and h1 being smaller than h2; and

[0010] A flat member is disposed in the first region, and the flat member is disposed on a surface of the first active layer away from the first current collector. The flat member is disposed in the first region to fill the step difference between the first region and the second region caused by the inconsistent thickness of the active layer, and at least a portion of the flat member is disposed in the first region to improve the overall flatness of the battery assembly.

[0011] According to an embodiment of the present application, the flat piece is disposed on the outermost surface of the first active layer of the battery assembly. The flat piece is attached to the outermost side of the battery assembly, which can prevent lithium plating from piercing the battery packaging bag and causing leakage, and can also reduce the difficulty of processing.

[0012] According to one embodiment of the present application, the flat piece is made of insulating material, which can prevent lithium plating from piercing the battery packaging bag and forming a short circuit.

[0013] According to one embodiment of the present application, the battery assembly also includes a second pole piece, the second pole piece includes a second current collector and a second active layer, the second active layer is arranged on the surface of the second current collector, the thickness of the second active layer located in the first area is h3, the thickness of the second active layer located in the second area is h4, h3 is less than h4, and the flat member is arranged on the second active layer away from the surface of the second current collector.

[0014] According to one embodiment of the present application, there are multiple first pole pieces and multiple second pole pieces, and the multiple first pole pieces and the multiple second pole pieces are arranged in sequence at intervals, and the flat piece is arranged between at least two of the first pole pieces and the second pole pieces arranged at intervals.

[0015] According to one embodiment of the present application, in the width direction of the battery assembly, the ratio of the length of the first pole sheet located in the first region to the length of the first pole sheet is 5%-30%.

[0016] According to one embodiment of the present application, in the width direction of the battery assembly, the ratio of the length of the first pole sheet located in the first region to the length of the first pole sheet is 10%-20%.

[0017] According to one embodiment of the present application, in the width direction of the battery assembly, the ratio of the length of the first pole sheet located in the first region to the length of the first pole sheet is 20%.

[0018] According to one embodiment of the present application, in the width direction of the battery assembly, the length of the first pole piece located in the first region is 4-10 mm.

[0019] According to one embodiment of the present application, in the width direction of the battery assembly, the length of the first pole piece located in the first area is 8 mm.

[0020] According to an embodiment of the present application, in the first pole piece located in the first region, the thickness of the first active layer gradually increases or decreases along the width direction of the battery assembly.

[0021] According to one embodiment of the present application, the battery assembly further includes a first pole ear, the first pole ear being disposed at one end of the battery assembly adjacent to the first region in the width direction of the battery pack, and the first pole ear being connected to the first region. The flat member covering at least part of the first pole ear can enhance the protection of the first pole ear.

[0022] According to an embodiment of the present application, the first pole tab is formed by extending the first pole piece outward, and the flat member at least partially covers a portion of the first pole tab close to the first region.

[0023] According to one embodiment of the present application, the battery assembly is L-shaped.

[0024] A battery comprises the aforementioned battery assembly.

[0025] An electronic device comprises the battery mentioned above.

[0026] Compared with the prior art, the flat piece of the present application is arranged in the first area to fill the step difference between the first area and the second area caused by the inconsistent thickness of the active layer. At least part of the flat piece is arranged in the first area to improve the overall flatness of the battery assembly, so that the battery assembly is fully pressurized as a whole during the manufacturing process, thereby further improving the safety performance of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic plan view of a battery cell according to the first embodiment of the present application.

[0028] Figure 2 It is a schematic cross-sectional view of a battery cell according to the first embodiment of the present application.

[0029] Figure 3 It is a schematic plan view of a battery cell according to the second embodiment of the present application.

[0030] Figure 4 It is a schematic cross-sectional view of a battery cell according to the second embodiment of the present application.

[0031] Figure 5 It is a schematic plan view of a battery according to the third embodiment of the present application.

[0032] Figure 6 It is a three-dimensional schematic diagram of an electronic device according to a fourth embodiment of the present application.

[0033] Main component symbols

[0034] Electronic device 1

[0035] Ontology 101

[0036] Battery 3

[0037] Packaging film 301

[0038] Battery pack 10, 20, 30

[0039] The first pole pieces 11, 21

[0040] First current collector 111, 211

[0041] First active layer 112, 212

[0042] Second pole pieces 12, 22

[0043] Second current collector 121, 221

[0044] Second active layers 122, 222

[0045] First pole tab 13, 23

[0046] First electrode tab units 131, 231

[0047] Second pole tabs 14, 24

[0048] Second tab units 141, 241

[0049] Flat parts 15, 25

[0050] Isolation film 16, 26

[0051] First area 17, 27

[0052] Second area 18, 28

[0053] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0054] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0055] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, when used herein, "includes" and / or "comprising" or "including" and / or "including" or "having" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components, components and / or groups thereof.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0057] The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0058] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0059] First embodiment

[0060] like Figure 1 to Figure 2 As shown, a battery assembly 10 is provided in the first embodiment of the present application.

[0061] A battery assembly 10 includes a first pole piece 11, a second pole piece 12, a first pole ear 13, a second pole ear 14, a flat member 15, a separator 16, a first region 17, and a second region 18. The number of the first pole piece 11 and the second pole piece 12 is multiple, and the multiple first pole pieces 11 and the second pole pieces 12 can be arranged in an overlapping manner by winding, laminating, or laminating winding. The first pole piece 11 and the second pole piece 12 can be stacked and arranged in sequence, and the separator 16 is arranged between the first pole piece 11 and the second pole piece 12 arranged at intervals. The first pole ear 13 is connected to the first pole piece 11, and the second pole ear 14 is connected to the second pole piece 12. In one embodiment, the battery assembly 10 is a cell structure of an L-shaped battery, the battery assembly 10 is L-shaped, and the first pole ear 13 and the second pole ear 14 are arranged at one end of the L-shaped battery assembly 10, for example, it can be the end of the short side of the battery assembly 10.

[0062] The first electrode sheet 11 includes a first current collector 111 and a first active layer 112, and the first active layer 112 is disposed on the surface of the first current collector 111. In one embodiment, the first current collector 111 can be made of a material with good conductivity and ductility, such as copper foil or aluminum foil. In one embodiment, the first active layer 112 disposed on the same surface of the first current collector 111 has an uneven thickness.

[0063] The second pole piece 12 includes a second current collector 121 and a second active layer 122, and the second active layer 122 is disposed on the surface of the second current collector 121. In one embodiment, the second current collector 121 can be made of a material with good conductivity and ductility, such as copper foil or aluminum foil. In one embodiment, the second active layer 122 disposed on the same surface of the second current collector 121 has an uneven thickness.

[0064] The first region 17 is disposed at one end of the battery assembly 10, and the second region 18 extends from the first region 17. In one embodiment, the region of the battery assembly 10 corresponding to the first pole piece 11 and the second pole piece 12 can be divided into two connected parts, the first region 17 and the second region 18. In one embodiment, the thickness of the first active layer 112 located in the first region 17 is h1, and the thickness of the first active layer 112 located in the second region 18 is h2, and h1 is less than h2; that is, for the first active layer 112 on the same surface of the same first current collector 111, the first active layer 112 located in the first region 17 is thinner than the first active layer 112 located in the second region 18. In one embodiment, the thickness of the second active layer 122 located in the first region 17 is h3, and the thickness of the second active layer 122 located in the second region 18 is h4, and h3 is less than h4; that is, for the second active layer 122 on the same surface of the same second current collector 121, the thickness of the second active layer 122 located in the first region 17 is smaller than that of the second active layer 122 located in the second region 18.

[0065] In one embodiment, in the first electrode sheet 11 located in the first region 17, the thickness of the first active layer 112 gradually increases or decreases along the width direction of the battery assembly 10. In this embodiment, the thickness of the first active layer 112 gradually decreases along the width direction of the battery assembly 10 toward the outside of the battery.

[0066] In one embodiment, in the second electrode sheet 12 located in the first region 17, the thickness of the second active layer 122 gradually increases or decreases along the width direction of the battery assembly 10. In this embodiment, the thickness of the first active layer 112 gradually decreases along the width direction of the battery assembly 10 toward the outside of the battery.

[0067] In one embodiment, the first region 17 may be located at the head of the battery assembly 10. In the width direction of the battery assembly 10, the ratio of the length of the first pole piece 11 located in the first region 17 to the total length of the first pole piece 11 is 5%-30%, and the ratio of the length of the second pole piece 12 located in the first region 17 to the total length of the second pole piece 12 is 5%-30%; in other embodiments, the ratio of the length of the first pole piece 11 located in the first region 17 to the total length of the first pole piece 11 is 10%-20% or 20%, and the ratio of the length of the second pole piece 12 located in the first region 17 to the total length of the second pole piece 12 is 10%-20% or 20%. According to one embodiment of the present application, in the width direction of the battery assembly 10, the optional length of the first pole piece 11 located in the first region 17 is 4-10mm, preferably 8mm; the optional length of the second pole piece 12 located in the first region 17 is 4-10mm, preferably 8mm.

[0068] The first pole tab 13 and the second pole tab 14 are disposed at one end of the battery assembly 10 adjacent to the first region 17 in the width direction of the battery assembly 10, and the first pole tab 13 and the second pole tab 14 are connected to the first region 17. In one embodiment, the first pole tab 13 and the second pole tab 14 are disposed at intervals, and the first pole tab 13 may include a plurality of first pole tab units 131, one first pole tab unit 131 is formed by extending from a first current collector 111, and a plurality of first pole tab units 131 are stacked or wound to form the first pole tab 13, and the second pole tab 14 includes a plurality of second pole tab units 141, one second pole tab unit 141 is formed by extending from a second current collector 121, and a plurality of second pole tab units 141 are stacked or wound to form the second pole tab 14.

[0069] In one embodiment, at least a portion of the flat piece 15 is disposed in the first region 17, the flat piece 15 is disposed at the outermost periphery of the battery assembly 10, and the flat piece 15 is disposed on the surface of the first active layer 112 away from the first current collector 111; specifically, the outermost layer of the battery assembly 10 is the first pole piece 11, and the flat piece 15 is disposed on the surface of the first active layer 112 located at the outermost layer.

[0070] In one embodiment, the flat member 15 is an insulating material, specifically green glue. In one embodiment, there are two flat members 15, which are respectively arranged on two opposite sides of the battery assembly 10. The flat members 15 are arranged on the two sides to fill the step difference caused by the inconsistent thickness of the active layer between the first area 17 and the second area 18. At least part of the flat member 15 is arranged in the first area 17 to improve the overall flatness of the battery assembly 10, so that the battery assembly 10 is fully compressed as a whole during the manufacturing process, and the safety performance of the battery assembly 10 is further improved.

[0071] In one embodiment, the flat member 15 at least partially covers the first tab 13 and the second tab 14 near the first region 17. The size of the flat member 15 may be the same as the area of ​​the first region 17, or the area of ​​the flat member 15 may be slightly larger than the area of ​​the first region 17. Specifically, the length and width of the flat member 15 may be respectively larger than the length and width of the first region 17, and the difference may be 0.4 mm.

[0072] Second embodiment

[0073] like Figure 3 to Figure 4 As shown, a battery assembly 20 provided in the first embodiment of the present application.

[0074] A battery assembly 20 includes a first pole piece 21, a second pole piece 22, a first pole ear 23, a second pole ear 24, a flat member 25, a separator 26, a first region 27, and a second region 28. The number of the first pole piece 21 and the second pole piece 22 is multiple, and the multiple first pole pieces 21 and the second pole pieces 22 can be arranged in an overlapping manner by winding, laminating, or laminating winding. The first pole piece 21 and the second pole piece 22 can be stacked and arranged in sequence, and the separator 26 is arranged between the first pole piece 21 and the second pole piece 22 arranged at intervals. The first pole ear 23 is connected to the first pole piece 21, and the second pole ear 24 is connected to the second pole piece 22. In one embodiment, the battery assembly 20 is a cell structure of an L-shaped battery, the battery assembly 20 is L-shaped, and the first pole ear 23 and the second pole ear 24 are arranged at one end of the L-shaped battery assembly 20, for example, it can be the end of the short side of the battery assembly 20.

[0075] The first electrode sheet 21 includes a first current collector 211 and a first active layer 212, and the first active layer 212 is disposed on the surface of the first current collector 211. In one embodiment, the first current collector 211 can be made of a material with good conductivity and ductility, such as copper foil or aluminum foil. In one embodiment, the first active layer 212 disposed on the same surface of the first current collector 211 has an uneven thickness.

[0076] The second pole piece 22 includes a second current collector 221 and a second active layer 222, and the second active layer 222 is disposed on the surface of the second current collector 221. In one embodiment, the second current collector 221 can be made of a material with good conductivity and ductility, such as copper foil or aluminum foil. In one embodiment, the second active layer 222 disposed on the same surface of the second current collector 221 has an uneven thickness.

[0077] The first region 27 is disposed at one end of the battery assembly 20, and the second region 28 extends from the first region 27. In one embodiment, the region of the battery assembly 20 corresponding to the first pole piece 21 and the second pole piece 22 can be divided into two connected parts, the first region 27 and the second region 28. In one embodiment, the thickness of the first active layer 212 located in the first region 27 is h1, and the thickness of the first active layer 212 located in the second region 28 is h2, and h1 is less than h2; that is, for the first active layer 212 on the same surface of the same first current collector 211, the first active layer 212 located in the first region 27 is thinner than the first active layer 212 located in the second region 28. In one embodiment, the thickness of the second active layer 222 located in the first region 27 is h3, and the thickness of the second active layer 222 located in the second region 28 is h4, and h3 is less than h4; that is, for the second active layer 222 on the same surface of the same second current collector 221, the thickness of the second active layer 222 located in the first region 27 is smaller than that of the second active layer 222 located in the second region 28.

[0078] In one embodiment, in the first electrode sheet 21 located in the first region 27, the thickness of the first active layer 212 gradually increases or decreases along the width direction of the battery assembly 20. In this embodiment, the thickness of the first active layer 212 gradually decreases along the width direction of the battery assembly 20 toward the outside of the battery.

[0079] In one embodiment, in the second electrode sheet 22 located in the first region 27, the thickness of the second active layer 222 gradually increases or decreases along the width direction of the battery assembly 20. In this embodiment, the thickness of the first active layer 212 gradually decreases along the width direction of the battery assembly 20 toward the outside of the battery.

[0080] In one embodiment, the first region 27 may be located at the head of the battery assembly 20. In the width direction of the battery assembly 20, the ratio of the length of the first pole piece 21 located in the first region 27 to the total length of the first pole piece 21 is 5%-30%, and the ratio of the length of the second pole piece 22 located in the first region 27 to the total length of the second pole piece 22 is 5%-30%; in other embodiments, the ratio of the length of the first pole piece 21 located in the first region 27 to the total length of the first pole piece 21 is 10%-20% or 20%, and the ratio of the length of the second pole piece 22 located in the first region 27 to the total length of the second pole piece 22 is 10%-20% or 20%. According to one embodiment of the present application, in the width direction of the battery assembly 20, the optional length of the first pole piece 21 located in the first region 27 is 4-10mm, preferably 8mm; the optional length of the second pole piece 22 located in the first region 27 is 4-10mm, preferably 8mm.

[0081] The first pole tab 23 and the second pole tab 24 are disposed at one end of the battery assembly 20 adjacent to the first region 27 in the width direction of the battery assembly 20, and the first pole tab 23 and the second pole tab 24 are connected to the first region 27. In one embodiment, the first pole tab 23 and the second pole tab 24 are disposed at intervals, and the first pole tab 23 may include a plurality of first pole tab units 231, one first pole tab unit 231 is formed by extending from a first current collector 211, and a plurality of first pole tab units 231 are stacked or wound to form the first pole tab 23, and the second pole tab 24 includes a plurality of second pole tab units 241, one second pole tab unit 241 is formed by extending from a second current collector 221, and a plurality of second pole tab units 241 are stacked or wound to form the second pole tab 24.

[0082] In one embodiment, the flat member 25 is an insulating material, specifically green glue. In one embodiment, at least part of the flat member 25 is disposed in the first region 27, the number of the flat members 15 is multiple, the flat member 25 is disposed between at least two first pole pieces 21 and second pole pieces 22 disposed at intervals, and the flat member 25 is disposed on the surface of the first active layer 212 away from the first current collector 211 and the surface of the second active layer 222 away from the second current collector 221. The flat member 25 is used to fill the step difference caused by the inconsistent thickness of the active layer between the first region 27 and the second region 28. At least part of the flat member 25 is disposed in the first region 27 to improve the overall flatness of the battery assembly 20, so that the battery assembly 20 is fully compressed as a whole during the manufacturing process, and the safety performance of the battery assembly 20 is further improved.

[0083] In one embodiment, the flat member 25 at least partially covers the first tab 23 and the second tab 24 near the first region 27. The size of the flat member 25 may be the same as the area of ​​the first region 27, or the area of ​​the flat member 25 may be slightly larger than the area of ​​the first region 27. Specifically, the length and width of the flat member 25 may be larger than the length and width of the first region 27, respectively, and the difference may be 0.4 mm.

[0084] Third embodiment

[0085] like Figure 5 , which is a three-dimensional schematic diagram of a battery 3 provided in the third embodiment of the present application. The battery 3 includes a battery assembly 30 and a packaging film 301 that wraps the battery assembly 30. The battery 3 is filled with electrolyte, and the electrolyte infiltrates the battery assembly 30.

[0086] Fourth embodiment

[0087] like Figure 6 FIG. 2 is a perspective view of an electronic device 1 according to a fourth embodiment of the present application. The present application also provides an electronic device 1 , which includes a body 101 and a battery 3 disposed in the body 101 . Figure 6The electronic device 1 is taken as a mobile phone as an example. In other embodiments, the electronic device 1 may also be a personal computer, a smart home appliance, an industrial controller, an electric car, a hybrid vehicle, etc.

[0088] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A battery assembly, characterized in that: include: A first pole piece, the first pole piece comprising a first current collector and a first active layer, the first active layer being disposed on a surface of the first current collector; A second pole piece, the second pole piece comprising a second current collector and a second active layer, the second active layer being disposed on a surface of the second current collector; as well as Flat pieces; The battery assembly comprises: A first region, the first region is disposed at one end of the battery assembly, and the thickness of the first active layer located in the first region is h1; and a second region, the second region extending from the first region, the thickness of the first active layer in the second region being h2, and h1 being less than h2; The flat member is disposed in the first region, and the flat member is disposed on a surface of the first active layer away from the first current collector; The battery assembly further includes a first electrode tab, which is disposed at one end of the battery assembly adjacent to the first region in the width direction of the battery assembly; The first pole tab includes a plurality of first pole tab units, the first pole tab units are formed by extending outward from the first current collector, and the plurality of first pole tab units are stacked or wound along the thickness direction of the battery assembly to form the first pole tab; The battery assembly further includes a second electrode tab, which is disposed at one end of the battery assembly adjacent to the first region in the width direction of the battery assembly; The second pole tab includes a plurality of second pole tab units, the second pole tab units are formed by extending outward from the second current collector, and the plurality of second pole tab units are stacked or wound along the thickness direction of the battery assembly to form the second pole tab; The first pole tab and the second pole tab are arranged in a row in the length direction of the battery assembly, and the flat member covers a portion of the first region corresponding to the first pole tab and the second pole tab.

2. The battery assembly according to claim 1, characterized in that The flat member is arranged on the outermost surface of the first active layer of the battery assembly.

3. The battery assembly according to claim 1, characterized in that The flat piece is made of insulating material.

4. The battery assembly according to claim 1, wherein: The battery assembly also includes a second pole piece, which includes a second current collector and a second active layer. The second active layer is arranged on the surface of the second current collector. The thickness of the second active layer located in the first area is h3, and the thickness of the second active layer located in the second area is h4, h3 is less than h4, and the flat member is arranged on the second active layer away from the surface of the second current collector.

5. The battery assembly according to claim 4, characterized in that: There are a plurality of the first pole pieces and the second pole pieces, and the plurality of the first pole pieces and the second pole pieces are sequentially spaced apart, and the flat member is disposed between at least two of the first pole pieces and the second pole pieces spaced apart.

6. The battery assembly according to claim 1, characterized in that: In the width direction of the battery assembly, the ratio of the length of the first pole piece located in the first region to the length of the first pole piece is 5%-30%.

7. The battery assembly according to claim 1, characterized in that: In the first pole piece located in the first region, the thickness of the first active layer gradually increases or decreases along the width direction of the battery assembly.

8. The battery assembly according to claim 1, wherein: The flat member at least partially covers a portion of the first electrode tab close to the first region, and along the length direction of the battery assembly, the length of the flat member is greater than the length of the first electrode tab.

9. The battery assembly according to claim 1, wherein: The flat member at least partially covers a portion of the second pole tab close to the first region, and along the length direction of the battery assembly, the length of the flat member is greater than the length of the second pole tab.

10. The battery assembly according to claim 8, characterized in that The battery assembly is L-shaped.

11. A battery, characterized in that: Comprising a battery assembly as described in any one of claims 1-10.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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