Battery cell, battery and electric device

Abstract

The utility model provides a kind of electric core, battery and electric equipment, it is related to battery technical field, including first and second pole piece, diaphragm, first and second tab;First pole piece includes first current collector, and one end has first single-face area;Second pole piece includes second current collector, and one end has second single-face area;First and second pole piece are jointly wound to form winding structure;Diaphragm is set between first and second pole piece;First and second single-face area respectively form at least part of the outermost circle and the innermost circle of winding structure, first active material layer is closer to the center of winding structure relative to first current collector, and and first tab is connected on the same side of first current collector, second active material layer is farther from the center of winding structure relative to second current collector, and and second tab is connected on the same side of second current collector.The electric core, battery and electric equipment in the utility model embodiment, volume can be further reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery cells, batteries, and electrical equipment. Background Technology

[0002] In related technologies, to reduce the amount of adhesive tape used and avoid removing the active material layer from the electrode, some techniques place the tabs directly on the empty foil area of ​​the electrode where no active material layer is present. After the electrode is wound, the empty foil area is bent relative to the rest of the electrode and located at the innermost loop of the winding structure. However, the tabs located in the empty foil area still occupy a significant amount of space, resulting in a relatively large cell volume and a low overall energy density. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell whose volume can be further reduced and whose energy density is higher.

[0004] This utility model also proposes a battery having the above-mentioned battery cell.

[0005] This utility model also proposes an electrical device having the above-mentioned battery.

[0006] The battery cell according to a first aspect embodiment of the present invention includes:

[0007] The first electrode includes a first current collector and a first active material layer. One end of the first electrode has a first single-sided region, and the first active material layer located in the first single-sided region is distributed on one side of the thickness direction of the first current collector.

[0008] The second electrode includes a second current collector and a second active material layer. One end of the second electrode has a second single-sided region, and the second active material layer located in the second single-sided region is distributed on one side of the thickness direction of the second current collector.

[0009] The first electrode and the second electrode are wound together to form a wound structure; the first single-sided region forms at least a portion of the outermost ring of the wound structure, and the first active material layer located in the first single-sided region is closer to the center of the wound structure than the first current collector located in the first single-sided region; the second single-sided region forms at least a portion of the innermost ring of the wound structure, and the second active material layer located in the second single-sided region is farther away from the center of the wound structure than the second current collector located in the second single-sided region.

[0010] A diaphragm is disposed between the first electrode and the second electrode to block the first electrode and the second electrode.

[0011] The first tab is connected to the first current collector in the first single-sided area and is located on the side where the first active material layer is distributed in the thickness direction of the first current collector.

[0012] The second electrode tab is connected to the second current collector in the second single-sided region and is located on the side where the second active material layer is distributed in the thickness direction of the second current collector.

[0013] The battery cell according to the present invention has at least the following beneficial effects: since the first active material layer located in the first single-sided region and the first electrode are disposed on the same side of the first current collector, and the second active material layer located in the second single-sided region and the second electrode are disposed on the same side of the second current collector, the first electrode can utilize the space occupied by the first active material layer in the thickness direction of the first current collector, and the second electrode can utilize the space occupied by the second active material layer in the thickness direction of the second current collector, and the space occupied by the battery cell can also be reduced.

[0014] According to some embodiments of the present invention, the battery cell further includes a first adhesive tape and a second adhesive tape. The first adhesive tape is attached to the side of the first tab away from the first current collector to prevent the first tab from contacting the separator; the second adhesive tape is attached to the side of the second tab away from the second current collector to prevent the second tab from contacting the separator. According to some embodiments of the present invention, the battery cell has a set width, and the winding structure includes a straight area and a bent area arranged along the width direction of the battery cell; both the first tab and the second tab are located in the straight area.

[0015] According to some embodiments of the present invention, the first electrode further has a first double-sided region, the first double-sided region being connected to the first single-sided region, and the first active material layer located in the first double-sided region being distributed on both sides in the thickness direction of the first current collector; along the arrangement direction of the first single-sided region and the first double-sided region, the first electrode tab is connected to the portion of the first current collector close to the first double-sided region.

[0016] And / or, the second electrode also has a second double-sided region, the second double-sided region being connected to the second single-sided region, the second active material layer located in the second double-sided region being distributed on both sides in the thickness direction of the second current collector; along the arrangement direction of the second single-sided region and the second double-sided region, the second tab is connected to the portion of the second current collector near the second double-sided region.

[0017] According to some embodiments of the present invention, the first tab and the second tab are spaced apart in the width direction of the battery cell.

[0018] According to some embodiments of the present invention, the battery cell has a set width, and the winding structure includes a first bending region, a straight region, and a second bending region arranged along the width direction of the battery cell; the first electrode includes a plurality of first straight portions located in the straight region; in the width direction of the battery cell, the first straight portion located at the innermost side of the winding structure has a first end and a second end, the first end is connected to a portion of the first electrode located in the second bending region, the second end is spaced from the first bending region, and the distance between the second end and the first bending region is less than the distance between the second end and the second bending region.

[0019] According to some embodiments of the present invention, the second electrode includes a plurality of second straight portions located in the straight region; in the width direction of the battery cell, the second straight portion located on the innermost side of the winding structure has a third end and a fourth end; the third end is connected to a portion of the first electrode located in the first bending region, and the fourth end is spaced from the second end in the width direction of the battery cell.

[0020] According to some embodiments of the present invention, the second electrode includes a plurality of second straight portions located in the straight region; in the width direction of the battery cell, the second straight portion located on the innermost side of the winding structure has a third end and a fourth end, the third end being connected to a portion of the first electrode located in the first bending region; the second electrode also has a second double-sided region, the second double-sided region having a fifth end in the straight region, the fifth end being connected to the second single-sided region, and the second active material layer located in the second double-sided region being distributed on both sides in the thickness direction of the second current collector;

[0021] In the width direction of the battery cell, the distance between the fourth end and the first bending area, the distance between the second end and the first bending area, and the distance between the second end and the fifth end are equal.

[0022] According to some embodiments of the present invention, in the width direction of the battery cell, the distance between the fourth end and the first bending area is at least 1 mm.

[0023] According to some embodiments of the present invention, the battery cell further includes a take-up adhesive tape, which is attached to the first current collector of the first single-sided region of the first electrode. A battery according to a second aspect embodiment of the present invention includes a battery cell as described in any of the above embodiments.

[0024] The battery according to the present invention has at least the following beneficial effects: since the first active material layer located in the first single-sided region and the first electrode are disposed on the same side of the first current collector, and the second active material layer located in the second single-sided region and the second electrode are disposed on the same side of the second current collector, the first electrode can utilize the space occupied by the first active material layer in the thickness direction of the first current collector, and the second electrode can utilize the space occupied by the second active material layer in the thickness direction of the second current collector, thus reducing the space occupied by the battery cell and the overall space occupied by the battery.

[0025] The electrical device according to a third aspect of the present invention includes a battery as described in the above embodiments.

[0026] The electrical device according to the embodiments of the present utility model has at least the following beneficial effects: since the first active material layer located in the first single-sided area and the first electrode are disposed on the same side of the first current collector, and the second active material layer located in the second single-sided area and the second electrode are disposed on the same side of the second current collector, the first electrode can utilize the space occupied by the first active material layer in the thickness direction of the first current collector, and the second electrode can utilize the space occupied by the second active material layer in the thickness direction of the second current collector, the space occupied by the battery cell can also be reduced, and the space occupied by the electrical device can also be reduced.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0029] Figure 1 This is a schematic diagram of the winding of the battery cell in some embodiments of this utility model;

[0030] Figure 2 for Figure 1 A magnified view shown at point A in the middle;

[0031] Figure 3 for Figure 1 The enlarged view shown at point B in the middle;

[0032] Figure 4 for Figure 1 A magnified view of the area shown at point C.

[0033] Figure label:

[0034] 10 cells;

[0035] First electrode 100, first current collector 110, first active material layer 120, first single-sided region 130, first straight portion 140, second end 142, first double-sided region 150;

[0036] Second electrode 200, second current collector 210, second active material layer 220, second single-sided region 230, second straight portion 240, fourth end 242, second double-sided region 250, fifth end 251;

[0037] The winding structure 300, the straight area 310, the bending area 320, the first bending area 330, and the second bending area 340;

[0038] Diaphragm 400;

[0039] First pole ear 500;

[0040] First adhesive tape 600;

[0041] Second pole ear 700;

[0042] Second adhesive tape 800;

[0043] 900 rolls of adhesive tape. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0047] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0048] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Please refer to Figures 1 to 4 As shown, this utility model proposes a battery cell 10, including a first electrode 100, a second electrode 200, a first tab 500, and a second tab 700.

[0050] It should be noted that this invention does not limit the polarity of the first electrode 100 and the second electrode 200. In some embodiments, the first electrode 100 is the positive electrode and the second electrode 200 is the negative electrode. In other embodiments, the first electrode 100 is the negative electrode and the second electrode 200 is the positive electrode.

[0051] Please refer to Figure 1 , Figure 2 As shown, the first electrode 100 of this invention includes a first current collector 110 and a first active material layer 120. One end of the first electrode 100 has a first single-sided region 130, and the first active material layer 120 located in the first single-sided region 130 is distributed on one side of the first current collector 110 in the thickness direction. The second electrode 200 of this invention includes a second current collector 210 and a second active material layer 220. One end of the second electrode 200 has a second single-sided region 230, and the second active material layer 220 located in the second single-sided region 230 is distributed on one side of the second current collector 210 in the thickness direction.

[0052] The first electrode 100 and the second electrode 200 are wound together to form a wound structure 300. A first single-sided region 130 forms at least a portion of the outermost ring of the wound structure 300, and the first active material layer 120 located in the first single-sided region 130 is closer to the center of the wound structure 300 than the first current collector 110 located in the first single-sided region 130. A second single-sided region 230 forms at least a portion of the innermost ring of the wound structure 300, and the second active material layer 220 located in the second single-sided region 230 is further away from the center of the wound structure 300 than the second current collector 210 located in the second single-sided region 230.

[0053] Please refer to Figure 1 As shown, the first electrode 100 and the second electrode 200 of this invention together form a wound structure 300. Both the first electrode 100 and the second electrode 200 have a helical cross-section perpendicular to the axial direction of the wound structure 300, and are stacked on top of each other in a direction away from the interior of the wound structure 300. The first active material layer 120 located in the first single-sided region 130 is closer to the interior of the wound structure 300 than the first current collector 110 located in the first single-sided region 130. Therefore, the first active material layer 120 located in the first single-sided region 130 can react with the second active material layer 220 of the adjacent second electrode 200 to generate electrical energy. The second active material layer 220 located in the second single-sided region 230 is further away from the center of the wound structure 300 than the second current collector 210 located in the second single-sided region 230. Therefore, the second active material layer 220 located in the second single-sided region 230 can react with the first active material layer 120 of the adjacent first electrode 100 to generate electrical energy.

[0054] The separator 400 of this invention is disposed between the first electrode 100 and the second electrode 200 to block the first electrode 100 and the second electrode 200. By disposing of the separator 400 between the first electrode 100 and the second electrode 200, short circuits can be avoided, and the charging and discharging function of the battery cell 10 can be realized. Without departing from the inventive concept of this invention, those skilled in the art can adjust the number of separators 400 according to actual needs. For example, please refer to... Figures 1 to 4 As shown, in some embodiments, the cell 10 includes two separators 400.

[0055] Please refer to Figure 1 , Figure 2 As shown, the first tab 500 of this invention is connected to the first current collector 110 located in the first single-sided region 130, and is located on the side where the first active material layer 120 is distributed in the thickness direction of the first current collector 110. The second tab 700 of this invention is connected to the second current collector 210 located in the second single-sided region 230, and is located on the side where the second active material layer 220 is distributed in the thickness direction of the second current collector 210.

[0056] With the above solution, since the first active material layer 120 and the first tab 500 located in the first single-sided region 130 are located on the same side of the first current collector 110, and the second active material layer 220 and the second tab 700 located in the second single-sided region 230 are located on the same side of the second current collector 210, the first tab 500 can utilize the space occupied by the first active material layer 120 in the thickness direction of the first current collector 110, and the second tab 700 can utilize the space occupied by the second active material layer 220 in the thickness direction of the second current collector 210, the space occupied by the battery cell 10 can also be reduced.

[0057] Further, please refer to Figure 1 , Figure 2 , Figure 3 As shown, the battery cell 10 also includes a first adhesive tape 600 and a second adhesive tape 800. The first adhesive tape 600 is attached to the side of the first tab 500 away from the first current collector 110 to prevent the first tab 500 from contacting the separator 400. The second adhesive tape 800 is attached to the side of the second tab 700 away from the second current collector 210 to prevent the second tab 700 from contacting the separator.

[0058] Through the above scheme, the first adhesive tape 600 can prevent the burrs of the first tab 500 from penetrating the separator 400, and the second adhesive tape 800 can prevent the burrs of the second tab 700 from penetrating the separator 400, thereby extending the life of the battery cell 10. Compared to existing solutions where adhesive tape is applied to both sides in the thickness direction of the current collector, the above embodiment places the first tab 500 on the first current collector 110 of the first single-sided region 130. Applying the first adhesive tape 600 only on the side of the first tab 500 near the winding structure 300 can prevent the burrs of the first tab 500 from piercing the separator 400. Furthermore, placing the second tab 700 on the second current collector 210 of the second single-sided region 230, applying the second adhesive tape 800 only on the side of the second tab 700 near the winding structure 300 can prevent the burrs of the second tab 700 from piercing the separator 400. This further reduces the amount of adhesive tape, reduces the space occupied by the battery cell 10, and improves the energy density.

[0059] Without departing from the inventive concept of this utility model, those skilled in the art can choose the specific shape of the winding structure 300. In some embodiments, the winding structure 300 is cylindrical.

[0060] As a preferred option, please refer to Figure 1 , Figure 2 , Figure 3As shown, in some embodiments, the battery cell 10 has a predetermined width, and the winding structure 300 includes a straight section 310 and a bending section 320 arranged along the width direction of the battery cell 10. The winding structure 300, including the straight section 310 and the bending section 320, can adapt to a square housing, which is beneficial for reducing the thickness of the product.

[0061] Based on the above scheme, in some embodiments, both the first tab 500 and the second tab 700 are located in the flat region 310. The portions of the first electrode 100 and the second electrode 200 located in the flat region 310 remain flat, ensuring that both the first tab 500 and the second tab 700 in the flat region 310 remain flat. This facilitates the connection of the first tab 500 and the second tab 700 to external devices. Specifically, the flatness of the first tab 500 and the second tab 700 allows for better contact with external devices during soldering, thereby ensuring a better soldering effect between the tabs and the external devices.

[0062] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the position of the first electrode 500 connected to the first current collector 110 and the position of the second electrode 700 connected to the second current collector 210.

[0063] In some embodiments, the first electrode 100 further includes a first double-sided region 150, which is connected to the first single-sided region 130. A first active material layer 120 located in the first double-sided region 150 is distributed on both sides of the first current collector 110 in the thickness direction. Along the arrangement direction of the first single-sided region 110 and the first double-sided region 150, a first tab 500 is connected to the portion of the first current collector 110 near the first double-sided region 150. Through this scheme, the electrical energy of the first active material layer 120 on the first double-sided region 150 can more easily flow into the first tab 500, which helps to reduce the internal resistance of the battery cell 10.

[0064] In some embodiments, the second electrode 200 further has a second double-sided region 250, which is connected to the second single-sided region 230. A second active material layer 220 located in the second double-sided region 250 is distributed on both sides of the second current collector 210 in the thickness direction. Along the arrangement direction of the second single-sided region 230 and the second double-sided region 250, a second tab 700 is connected to the portion of the second current collector 210 near the second double-sided region 250. Through this scheme, the electrical energy of the second active material layer 220 on the second double-sided region 250 can more easily flow into the second tab 700, which helps to reduce the internal resistance of the battery cell 10.

[0065] As a preferred embodiment, in some embodiments, the first electrode 100 further has a first double-sided region 150, which is connected to the first single-sided region 130. The first active material layer 120 located in the first double-sided region 150 is distributed on both sides of the first current collector 110 in the thickness direction. Along the arrangement direction of the first single-sided region 110 and the first double-sided region 150, the first tab 500 is connected to the portion of the first current collector 110 near the first double-sided region 150. The second electrode 200 further has a second double-sided region 250, which is connected to the second single-sided region 230. The second active material layer 220 located in the second double-sided region 250 is distributed on both sides of the second current collector 210 in the thickness direction. Along the arrangement direction of the second single-sided region 230 and the second double-sided region 250, the second tab 700 is connected to the portion of the second current collector 210 near the second double-sided region 250. Through the above scheme, the electrical energy of the first active material layer 120 on the first double-sided region 150 can flow more easily into the first tab 500, and the electrical energy of the second active material layer 220 on the second double-sided region 250 can flow more easily into the second tab 700, which is beneficial to significantly reduce the internal resistance of the cell 10.

[0066] Further, please refer to Figure 1 As shown, in some embodiments, the first tab 500 and the second tab 700 are spaced apart in the width direction of the battery cell 10. This design allows workers to distinguish the first tab 500 and the second tab 700 based on their positions in the width direction of the battery cell 10, reducing the risk of incorrect soldering when attaching the tabs to external devices. Furthermore, since the first adhesive tape 600 is bonded to one side of the first tab 500 in the thickness direction of the first current collector 110, and the second adhesive tape 800 is bonded to one side of the second tab 700 in the thickness direction of the second current collector 210, the spacing between the first tab 500 and the second tab 700 in the width direction of the battery cell 10 allows the bonding positions of the first adhesive tape 600 and the second adhesive tape 800 to be staggered in the width direction of the battery cell 10, thereby reducing the maximum thickness of the battery cell 10 and increasing its flatness.

[0067] Please refer to Figure 1 , Figure 4As shown, in some embodiments, the battery cell 10 has a predetermined width, and the winding structure 300 includes a first bending region 330, a straight region 310, and a second bending region 340 arranged along the width direction of the battery cell 10. The first electrode 100 includes a plurality of first straight portions 140 located in the straight region 310. In the width direction of the battery cell 10, the first straight portion 140 located at the innermost side of the winding structure 300 has a first end and a second end 142. The first end connects to a portion of the first electrode 100 located in the second bending region 340, and the second end 142 is spaced from the first bending region 330, and the distance between the second end 142 and the first bending region 330 is less than the distance between the second end 142 and the second bending region 340.

[0068] It should be understood that the "first straight portion 140 located at the innermost side of the winding structure 300" referred to in this utility model refers to the one of the plurality of first straight portions 140 of the first electrode 100 that is closest to the axis of the winding structure 300. By having a gap between the second end 142 of the first straight portion 140 and the first bending area 330 in the width direction of the cell 10, it is beneficial to reduce the possibility of the second end 142 folding relative to other parts of the first straight portion 140 located at the innermost side of the winding structure 300 during the winding process of the first electrode 100, thereby reducing the space occupied by the second end 142 of the first straight portion 140 in the thickness direction of the cell 10 and improving the energy density of the cell 10.

[0069] Further, please refer to Figure 4 As shown, where Figure 4 The positional relationship of the winding structure 300 of the battery cell 10 is shown. In some embodiments, the second electrode 200 includes a plurality of second straight portions 240 located in the straight region 310; in the width direction of the battery cell 10, the innermost second straight portion 240 located in the winding structure 300 has a third end (not shown) and a fourth end 242. The third end is connected to a portion of the first electrode 100 located in the first bending region 330, and the fourth end 242 is spaced from the second end 142 in the width direction of the battery cell 10.

[0070] Please refer to Figure 4 As shown, the size of the gap between the fourth end 242 and the first bending area 330 is D1, and the size of the gap between the second end 142 and the first bending area 330 is D2. Since the fourth end 242 and the second end 142 are spaced apart in the width direction of the cell 10, then D2 > D1 or D1 > D2.

[0071] When D2 > D1, the second straight portion 240 located on the innermost side of the winding structure 300 can fill the gap between the first straight portion 140 located on the innermost side of the winding structure 300 and the first bending area 330, thereby reducing the thickness difference of different parts of the cell 10 in the width direction, increasing the overall flatness of the cell 10, and making the first electrode 100 and the second electrode 200 contact more tightly after the cell 10 is subsequently hot-pressed, which is conducive to the insertion and extraction of lithium ions, reduces lithium plating, and thus extends the service life of the cell 10.

[0072] When D1 > D2, the second straight portion 240 located on the innermost side of the winding structure 300 can completely fill the gap between the first straight portion 140 located on the innermost side of the winding structure 300 and the first bending area 330, thereby reducing the thickness difference of different parts of the cell 10 in the width direction, increasing the overall flatness of the cell 10, and making the first electrode 100 and the second electrode 200 more closely contacted after the cell 10 is subsequently hot-pressed, which is conducive to the insertion and extraction of lithium ions, reduces lithium plating, and thus extends the service life of the cell 10.

[0073] Further, please refer to Figure 4 As shown, in some embodiments, the second electrode 200 includes a plurality of second straight portions 240 located in the straight region 310; in the width direction of the cell 10, the second straight portion 240 located on the innermost side of the winding structure 300 has a third end and a fourth end 242, the third end being connected to a portion of the first electrode 100 located in the first bending region 330; the second electrode 200 also has a second double-sided region 250, the second double-sided region 250 having a fifth end 251 in the straight region 310, the fifth end 251 being connected to the second single-sided region 230, and the second active material layer 220 located in the second double-sided region 250 being distributed on both sides in the thickness direction of the second current collector 210. In the width direction of the cell 10, the distance D1 between the fourth end 242 and the first bending region 330, the distance D2 between the second end 142 and the first bending region 330, and the distance D3 between the second end 142 and the fifth end 251 are equal.

[0074] Through the above scheme, the second straight portion 240 located on the innermost side of the winding structure 300 can precisely fill the gap between the first straight portion 140 located on the innermost side of the winding structure 300 and the first bending area 330, and can make the end of the second double-sided area 250 exactly flush with the first bending area 330, avoiding the gap between the fifth end 251 of the second double-sided area 250 and the first bending area 330, which is conducive to further enhancing the flatness of the cell 10. After the cell 10 is subsequently hot-pressed and formed, the first electrode 100 and the second electrode 200 can be in closer contact, which is conducive to the insertion and extraction of lithium ions, reducing lithium plating, and thus extending the service life of the cell 10.

[0075] Furthermore, in some embodiments, the distance D1 between the fourth end 242 and the first bending region 330 in the width direction of the cell 10 is at least 1 mm. Through the above scheme, after the first electrode 100 and the second electrode 200 form the winding structure 300, the second straight portion 240 located on the innermost side of the winding structure 300 can remain more flat, which is beneficial to increasing the overall flatness of the cell 10.

[0076] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the winding method of the battery cell 10. In some embodiments, the outermost end of the first current collector 110 is welded to another portion of the first current collector 110. In some embodiments, please refer to Figure 1 As shown, in some embodiments, the battery cell 10 further includes a take-up adhesive tape 900, which is attached to the first current collector 110 of the first single-sided region 130 of the first electrode 100. The above solution can take the battery cell 10 as a whole and keep the battery cell 10 in a fixed shape, which is convenient for subsequent assembly.

[0077] This utility model also proposes a battery, which includes a cell 10 as described in any of the above embodiments. Since the first active material layer 120 located in the first single-sided region 130 and the first tab 500 are disposed on the same side of the first current collector 110, and the second active material layer 220 located in the second single-sided region 230 and the second tab 700 are disposed on the same side of the second current collector 210, the first tab 500 can utilize the space occupied by the first active material layer 120 in the thickness direction of the first current collector 110, and the second tab 700 can utilize the space occupied by the second active material layer 220 in the thickness direction of the second current collector 210, thus reducing the space occupied by the cell 10. It should be noted that since this embodiment adopts all the technical features of the cell 10 of the above embodiments, the battery of this embodiment possesses all the beneficial effects brought by the cell 10 of the above embodiments, which will not be repeated here.

[0078] This utility model also proposes an electrical device, which includes the battery as described in the above embodiments. Since the first active material layer 120 in the first single-sided region 130 and the first tab 500 are disposed on the same side of the first current collector 110, and the second active material layer 220 in the second single-sided region 230 and the second tab 700 are disposed on the same side of the second current collector 210, the first tab 500 can utilize the space occupied by the first active material layer 120 in the thickness direction of the first current collector 110, and the second tab 700 can utilize the space occupied by the second active material layer 220 in the thickness direction of the second current collector 210, thus reducing the space occupied by the battery cell 10. It should be noted that since this embodiment adopts all the technical features of the battery in the above embodiments, the electrical device of this embodiment possesses all the beneficial effects brought by the battery in the above embodiments, which will not be repeated here.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery cell, characterized in that, include: The first electrode includes a first current collector and a first active material layer. One end of the first electrode has a first single-sided region, and the first active material layer located in the first single-sided region is distributed on one side of the thickness direction of the first current collector. The second electrode includes a second current collector and a second active material layer. One end of the second electrode has a second single-sided region, and the second active material layer located in the second single-sided region is distributed on one side of the thickness direction of the second current collector. The first electrode and the second electrode are wound together to form a wound structure; the first single-sided region forms at least a portion of the outermost ring of the wound structure, and the first active material layer located in the first single-sided region is closer to the center of the wound structure than the first current collector located in the first single-sided region; the second single-sided region forms at least a portion of the innermost ring of the wound structure, and the second active material layer located in the second single-sided region is farther away from the center of the wound structure than the second current collector located in the second single-sided region. A diaphragm is disposed between the first electrode and the second electrode to block the first electrode and the second electrode; The first tab is connected to the first current collector in the first single-sided area and is located on the side where the first active material layer is distributed in the thickness direction of the first current collector. The second electrode tab is connected to the second current collector in the second single-sided region and is located on the side where the second active material layer is distributed in the thickness direction of the second current collector.

2. The battery cell according to claim 1, characterized in that, The battery cell also includes a first adhesive tape and a second adhesive tape. The first adhesive tape is attached to the side of the first tab away from the first current collector to prevent the first tab from contacting the separator. The second adhesive tape is attached to the side of the second tab away from the second current collector to prevent the second tab from contacting the separator.

3. The battery cell according to claim 1, characterized in that, The battery cell has a set width, and the winding structure includes a straight area and a bent area arranged along the width direction of the battery cell; the first tab and the second tab are both located in the straight area.

4. The battery cell according to claim 3, characterized in that, The first electrode also has a first double-sided region, which is connected to the first single-sided region. The first active material layer located in the first double-sided region is distributed on both sides of the thickness direction of the first current collector. Along the arrangement direction of the first single-sided region and the first double-sided region, the first tab is connected to the portion of the first current collector close to the first double-sided region. And / or, the second electrode also has a second double-sided region, the second double-sided region being connected to the second single-sided region, the second active material layer located in the second double-sided region being distributed on both sides in the thickness direction of the second current collector; along the arrangement direction of the second single-sided region and the second double-sided region, the second tab is connected to the portion of the second current collector near the second double-sided region.

5. The battery cell according to claim 3, characterized in that, In the width direction of the battery cell, the first tab and the second tab are spaced apart.

6. The battery cell according to claim 1, characterized in that, The battery cell has a set width, and the winding structure includes a first bending region, a straight region, and a second bending region arranged along the width direction of the battery cell; the first electrode includes a plurality of first straight portions located in the straight region; in the width direction of the battery cell, the first straight portion located at the innermost side of the winding structure has a first end and a second end, the first end is connected to a portion of the first electrode located in the second bending region, the second end is spaced from the first bending region, and the distance between the second end and the first bending region is less than the distance between the second end and the second bending region.

7. The battery cell according to claim 6, characterized in that, The second electrode includes a plurality of second straight portions located in the straight region; in the width direction of the cell, the second straight portion located on the innermost side of the winding structure has a third end and a fourth end; the third end is connected to a portion of the first electrode located in the first bending region, and the fourth end is spaced from the second end in the width direction of the cell.

8. The battery cell according to claim 6, characterized in that, The second electrode includes a plurality of second straight portions located in the straight region; in the width direction of the cell, the second straight portion located on the innermost side of the winding structure has a third end and a fourth end, the third end being connected to a portion of the first electrode located in the first bending region; the second electrode also has a second double-sided region, the second double-sided region having a fifth end in the straight region, the fifth end being connected to the second single-sided region, and the second active material layer located in the second double-sided region being distributed on both sides in the thickness direction of the second current collector; In the width direction of the battery cell, the distance between the fourth end and the first bending area, the distance between the second end and the first bending area, and the distance between the second end and the fifth end are equal.

9. The battery cell according to claim 7, characterized in that, In the width direction of the battery cell, the distance between the fourth end and the first bending area is at least 1 mm.

10. The battery cell according to claim 1, characterized in that, The battery cell also includes a take-up adhesive tape, which is attached to the first current collector of the first single-sided area of ​​the first electrode.

11. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

12. Electrical equipment, characterized in that, Includes the battery as described in claim 11.

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