Battery cell, battery and electronic equipment

Abstract

The utility model discloses a battery cell, battery and electronic equipment wherein the battery cell comprises: a roll core, the roll core comprises a wound pole piece, the pole piece is provided with a main body area and a first empty foil area, the first empty foil area is located at the ending end of the main body area; the first empty foil area comprises a first leading-out section and a second leading-out section, the first leading-out section is connected with the main body area, the second leading-out section is connected with the first leading-out section on one side of the width direction of the pole piece, and the second leading-out section is located on one side of the first leading-out section deviating from the center of the winding core; the first tab is arranged on the side surface of the roll core, and the first end of the first tab is connected with the second lead-out section; and the first gummed paper is adhered to the side surface of the roll core, the first gummed paper covers the ending end of the roll core, and a part of the first gummed paper is positioned between the first leading-out section and the second leading-out section.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a kind of battery cell, battery and electronic equipment. BACKGROUND

[0002] In the traditional battery cell manufacturing process, the end of the winding core of the winding type battery cell is usually fixed by adhesive tape. However, in the related art, when the tab is led out from the side of the winding core, the adhesive tape often needs to avoid the part of the pole piece connected to the tab in the width direction of the pole piece, so only a relatively narrow adhesive tape can be used for bonding. This structure limits the fixing range of the adhesive tape, and the stability of the battery cell structure is low. SUMMARY

[0003] The first object of the utility model is to provide a new technical solution for battery cells, which at least solves the technical problem of insufficient structural stability caused by the tab being led out from the side of the winding core in existing battery cells.

[0004] The second object of the utility model is to provide a new technical solution for batteries.

[0005] The third object of the utility model is to provide a new technical solution for electronic devices.

[0006] According to the first aspect of the utility model, a battery cell is provided, comprising: a winding core, the winding core comprising a wound pole piece, the pole piece having a main body region and a first empty foil region, the first empty foil region being located at the end of the main body region; the first empty foil region comprises a first lead-out section and a second lead-out section, the first lead-out section is connected with the main body region, the second lead-out section is connected with the first lead-out section on one side of the width direction of the pole piece, and the second lead-out section is located on the side of the first lead-out section away from the center of the winding core; a first tab, the first tab is provided on the side of the winding core, the first end of the first tab is connected with the second lead-out section; a first adhesive tape, the first adhesive tape is bonded to the side of the winding core, the first adhesive tape covers the end of the winding core, and part of the first adhesive tape is located between the first lead-out section and the second lead-out section.

[0007] Optionally, the connection length of the first lead-out section and the main body region is less than or equal to the width of the pole piece.

[0008] Optionally, the first lead-out section and the second lead-out section are connected by a first bending part.

[0009] Optionally, the first lead-out section is provided with a second bending part, and in the case that the first bending part and the second bending part are flattened, the first lead-out section and the second lead-out section are distributed along the length direction or the width direction of the pole piece.

[0010] Optionally, the battery cell further comprises a second adhesive paper, the second adhesive paper is attached to a side of the first adhesive paper away from the center of the winding core, and the second lead-out section is located between the second adhesive paper and the first adhesive paper.

[0011] Optionally, the main body region comprises two tail ends, the first tabs are connected to the two tail ends respectively, and the two first tabs are connected in layers.

[0012] Optionally, the main body region comprises a plurality of active regions and second empty foil regions distributed along the winding direction of the main body region, the second empty foil region is connected between two active regions, the second empty foil region comprises a third lead-out section and a fourth lead-out section, the third lead-out section is connected to the active region, the fourth lead-out section is connected to one side of the third lead-out section in the width direction of the pole piece, and the fourth lead-out section is located on the side surface of the winding core; the battery cell further comprises a second tab, the second tab is arranged on the side surface of the winding core, the first end of the second tab is connected to the fourth lead-out section, and the second tab is connected in layers with the first tab.

[0013] Optionally, the connection length of the third lead-out section and the active region is less than the width of the pole piece.

[0014] Optionally, the third lead-out section and the fourth lead-out section are connected through a third bending part.

[0015] Optionally, the third lead-out section is provided with a fourth bending part, and in the case that the third bending part and the fourth bending part are flattened, the third lead-out section and the fourth lead-out section are distributed along the width direction of the pole piece.

[0016] Optionally, the winding core is configured in a flat shape, the length of the winding core is greater than the width of the winding core, the width direction of the winding core is the same as the width direction of the pole piece, and the first pole piece and the second pole piece are arranged on the side surface of the winding core in the length direction.

[0017] According to the second aspect of the present application, a battery is provided, comprising the battery cell of any one of the above.

[0018] Optionally, the battery is a curved battery or a long strip-shaped battery.

[0019] According to the third aspect of the present application, an electronic device is provided, comprising the battery of any one of the above.

[0020] According to the electric core of the utility model, through connecting the second leading-out section of the first tab with the one side of the first leading-out section in the width direction of the pole piece, when the first tab is led out from the winding core side, the first adhesive paper can also fix the end position of the first leading-out section corresponding to the winding core in the winding direction of the winding core, the fixing range is increased, so that the electric core structure stability can be effectively improved, the risk of electric core scattering is reduced, and then the battery performance and safety can be guaranteed.

[0021] Other features of the utility model and its advantages will become clear from the following detailed description of exemplary embodiments of the utility model with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

[0023] Figure 1 is the structure schematic diagram of the electric core according to one embodiment provided by the utility model;

[0024] Figure 2 is the structure schematic diagram of the electric core at the first bending part in the flattening case according to one embodiment provided by the utility model;

[0025] Figure 3 is the structure schematic diagram of the pole piece of the electric core in the flattening case according to one embodiment provided by the utility model;

[0026] Figure 4 is the partial structure schematic diagram of the first empty foil area of the pole piece in the flattening state of the third bending part according to one embodiment provided by the utility model;

[0027] Figure 5 is the structure schematic diagram of the pole piece of the electric core in the flattening case according to another embodiment provided by the utility model;

[0028] Figure 6 is the structure schematic diagram of the pole piece in the flattening case of the first bending part according to another embodiment of one embodiment provided by the utility model;

[0029] Figure 7 is the structure schematic diagram of the pole piece in the flattening case of the first bending part and the third bending part according to another embodiment of one embodiment provided by the utility model.

[0030] REFERENCE SIGNS:

[0031] 100, electric core;

[0032] 10. Electrode; 11. First empty foil region; 11a. First lead-out section; 11b. Second lead-out section; 12. Active region; 13. Second empty foil region; 13a. Third lead-out section; 13b. Fourth lead-out section;

[0033] 20. First tab; 30. First adhesive tape; 40. Second adhesive tape. Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] The battery cell 100 according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] like Figures 1 to 7 As shown, the battery cell 100 according to an embodiment of the present invention includes a core, a first adhesive tape 30, and a first tab 20.

[0041] Specifically, the core includes a wound electrode sheet 10, which has a main body area and a first empty foil area 11. The first empty foil area 11 is located at the end of the main body area and includes a first lead-out section 11a and a second lead-out section 11b. The first lead-out section 11a is connected to the main body area, and the second lead-out section 11b is connected to the first lead-out section 11a on one side of the width direction of the electrode sheet 10. The second lead-out section 11b is located on the side of the first lead-out section 11a away from the center of the core. A first electrode tab 20 is provided on the side of the core, and the first end of the first electrode tab 20 is connected to the second lead-out section 11b. A first adhesive tape 30 is adhered to the side of the core, and the first adhesive tape 30 covers the end of the core. A portion of the first adhesive tape 30 is located between the first lead-out section 11a and the second lead-out section 11b.

[0042] In other words, such as Figures 1 to 7 As shown, the battery cell 100 according to an embodiment of this application mainly consists of a core, a first adhesive tape 30, and a first electrode tab 20. The core mainly includes an electrode sheet 10 and a separator. The electrode sheet 10 is divided into a positive electrode sheet 10 and a negative electrode sheet 10. The separator is divided into a first separator and a second separator. The positive electrode sheet, the first separator, the negative electrode sheet, and the second separator are sequentially stacked and wound to form the core. The electrode sheet 10 (i.e., the positive electrode sheet and the negative electrode sheet) specifically has a main body region and a first empty foil region 11 (i.e., a current collector that is not coated with positive / negative electrode active materials). The end of the main body region near the center of the core is the starting end, and the end of the main body region away from the center of the core is the ending end. The first empty foil region 11 is located at the ending end of the main body region.

[0043] The first empty foil area 11 is mainly composed of a first lead-out section 11a and a second lead-out section 11b. The first lead-out section 11a is connected to the end of the main body area, and the second lead-out section 11b is located on the side of the first lead-out section 11a away from the center of the core. The second lead-out section 11b and the first lead-out section 11a are connected on one side of the width direction of the electrode 10. The second lead-out section 11b is welded to the first end of the first electrode tab 20. A part of the first adhesive tape 30 is bonded to the outer side of the end of the core, and another part of the first adhesive tape 30 is bonded to the side of the core in front of the core winding direction, so that the first adhesive tape covers the end of the core, thereby fixing the end of the core.

[0044] In this embodiment, a portion of the first adhesive tape 30 is located between the first lead-out section 11a and the second lead-out section 11b. That is, the first lead-out section 11a is located on the side of the first adhesive tape 30 closer to the center of the core, and the second lead-out section 11b is located on the side of the first adhesive tape 30 away from the center of the core. This allows the end position of the first lead-out section 11a corresponding to the core to be fixed in the winding direction, increasing the fixing range, ensuring the tightening effect, and improving the structural stability of the battery cell 100.

[0045] Therefore, according to the battery cell 100, the second lead-out section 11b connected with the first lead-out section 11a at one side of the jelly-roll in the width direction of the jelly-roll is connected with the first tab 20, so that when the first tab 20 is led out from the side of the jelly-roll, the first adhesive paper 30 can also fix the end position of the first lead-out section 11a corresponding to the jelly-roll in the winding direction of the jelly-roll, thereby increasing the fixing range, so that the structural stability of the battery cell 100 can be effectively improved, the risk of the battery cell 100 being scattered can be reduced, and then the performance and safety of the battery can be ensured.

[0046] According to an embodiment of the utility model, the connection length of the first lead-out section 11a and the main body area is less than or equal to the width of the jelly-roll.

[0047] That is, the connection length of the first lead-out section 11a and the main body area includes the following cases:

[0048] Case one, as shown in Figure 3 and Figure 6 , the connection length of the first lead-out section 11a and the main body area is less than the width of the jelly-roll. In this case, the connection position of the first lead-out section 11a and the main body area can be used as an overcurrent protection position, when the current in the battery abnormally increases and exceeds the designed bearing range, the overcurrent protection position will be fused and cause short circuit, so that the thermal runaway of the battery can be effectively avoided, and the safety of the battery is improved.

[0049] Case two, as shown in Figure 5 , the connection length of the first lead-out section 11a and the main body area is equal to the width of the jelly-roll. In this case, it is beneficial to simplify the processing technology of the jelly-roll 10, thereby improving the production efficiency of the battery cell 100.

[0050] In some specific embodiments of the utility model, the first lead-out section 11a and the second lead-out section 11b are connected through the first bending part.

[0051] Specifically, the first empty foil area 11 is an integrated structure, and the second lead-out section 11b can be folded to the side of the first lead-out section 11a away from the center of the jelly-roll by bending the first empty foil area 11, and after the bending is completed, the position where the first lead-out section 11a and the second lead-out section 11b are connected forms the first bending part connecting each other, which is simple in structure and convenient for production and manufacturing.

[0052] According to an embodiment of the utility model, the first lead-out section 11a is provided with a second bending part, and in the case that the first bending part and the second bending part are flattened, the first lead-out section 11a and the second lead-out section 11b are distributed along the length direction or the width direction of the jelly-roll.

[0053] That is, as shown in Figure 3 and Figure 5As shown, the first lead-out section 11a and the second lead-out section 11b are obtained by repeatedly bending the first empty foil area 11. When the first empty foil area 11 is in a flattened state, the first empty foil area 11 is a long strip structure extending along the length direction of the electrode 10. The first lead-out section 11a and the second lead-out section 11b are distributed along the length direction of the electrode 10. By bending the first empty foil area 11, the first lead-out section 11a with a second bend can be formed. The first lead-out section 11a is roughly a triangular structure. At this time, the second lead-out section 11b is located on one side of the width of the first lead-out section 11a on the electrode 10. After the first adhesive tape 30 is bonded, the second lead-out section 11b can be folded to the side of the first lead-out section 11a away from the center of the core by bending the first empty foil area 11. The structure is simple and easy to manufacture.

[0054] like Figure 6 As shown, when the first empty foil area 11 is in a flattened state, the first empty foil area 11 is a long strip structure extending along the width direction of the electrode 10. The first lead-out section 11a and the second lead-out section 11b are distributed along the width direction of the electrode 10. By bending the first empty foil area 11, a first lead-out section 11a with a second bend can be formed. The first lead-out section 11a is roughly rectangular. At this time, the second lead-out section 11b is located on one side of the width of the first lead-out section 11a on the electrode 10. After the first adhesive tape 30 is bonded, the second lead-out section 11b can be folded to the side of the first lead-out section 11a away from the center of the core by bending the first empty foil area 11. The structure is simple and easy to manufacture.

[0055] In this embodiment, the first lead-out section 11a and the second lead-out section 11b can be obtained by bending the first empty foil area 11, which has a simple structure and is easy to manufacture.

[0056] In some specific embodiments of this utility model, the battery cell 100 further includes: a second adhesive tape 40, which is bonded to the side of the first adhesive tape 30 away from the center of the core, and the first end of the second lead-out section 11b and the first electrode tab 20 are located between the second adhesive tape 40 and the first adhesive tape 30.

[0057] Specifically, such as Figure 1 As shown, a second adhesive tape 40 is bonded to the side of the first adhesive tape 30 away from the center of the core. The second adhesive tape 40 covers the first end of the second lead-out section 11b and the first electrode tab 20. That is, the first end of the second lead-out section 11b and the first electrode tab 20 is located between the second adhesive tape 40 and the first adhesive tape 30. This can fix the position of the first end of the second lead-out section 11b and the first electrode tab 20, thereby effectively preventing the first end of the second lead-out section 11b and the first electrode tab 20 from moving, and thus preventing the first empty foil area 11 from breaking. This can effectively improve the reliability of the battery cell 100.

[0058] In some specific embodiments of this utility model, the main body area includes two end points, each end point is connected to a first electrode tab 20, and the two first electrode tabs 20 are stacked and connected.

[0059] In other words, such as Figure 6 As shown, the electrode 10 can be folded in half before winding, so that the two ends of the electrode 10 overlap in the length direction. This makes the main body area form two end points in the length direction of the electrode 10. The two end points are connected to the first tabs 20 through the corresponding first empty foil area 11. The two first tabs 20 are stacked and can be connected together by welding, which can effectively improve the power of the cell and thus improve the charging and discharging efficiency of the battery.

[0060] According to one embodiment of the present invention, the main body area includes a plurality of active areas 12 distributed along its winding direction and a second empty foil area 13. The second empty foil area 13 is connected between two active areas 12. The second empty foil area 13 includes a third lead-out section 13a and a fourth lead-out section 13b. The third lead-out section 13a is connected to the active area 12, and the fourth lead-out section 13b is connected to the third lead-out section 13a on one side of the width direction of the electrode sheet 10. The fourth lead-out section 13b is located on the side of the winding core. The battery cell 100 also includes a second electrode tab, which is disposed on the side of the winding core. The first end of the second electrode tab is connected to the fourth lead-out section 13b, and the second electrode tab is stacked and connected to the first electrode tab 20.

[0061] Specifically, such as Figure 7 As shown, the main body area includes multiple active areas 12 distributed along its own winding direction and a second empty foil area 13. The active areas 12 are current collectors coated with positive / negative electrode active materials, and the second empty foil area 13 is a current collector without positive / negative electrode active materials. A second empty foil area 13 is provided between each pair of adjacent active areas 12. The second empty foil area 13 mainly consists of a third lead-out section 13a and a fourth lead-out section 13b. The third lead-out section 13a is connected to the two active areas 12 on both sides of the electrode sheet 10 along its length. The fourth lead-out section 13b is located on the outside of the winding core, and it is connected to the third lead-out section 13a on one side of the electrode sheet 10 along its width. The fourth lead-out section 13b is welded to the first end of the second tab, allowing the second tab to be led out from the side of the cell 100. The second tab is stacked with the first tab 20, thereby further improving the cell's power and the battery's charging and discharging efficiency.

[0062] In some specific embodiments of this utility model, the connection length between the third lead-out section 13a and the active region 12 is less than the width of the electrode 10.

[0063] In other words, the connection length between the third lead-out segment 13a and the active region 12 includes the following cases:

[0064] Case I, as shown in Figure 7 the third lead-out section 13a and the active area 12 is less than the width of the pole piece 10. In this case, the third lead-out section 13a and the active area 12 can be connected as an overcurrent protection, when the current in the battery is abnormally increased, exceeding its designed bearing range, the overcurrent protection will be fused and cause a short circuit, thereby effectively avoiding the thermal runaway of the battery, effectively improving the safety of the battery.

[0065] Case II, the third lead-out section 13a and the active area 12 is equal to the width of the pole piece 10. In this case, it is beneficial to simplify the processing technology of the pole piece 10, thereby improving the production efficiency of the battery cell 100.

[0066] According to an embodiment of the present application, the third lead-out section 13a and the fourth lead-out section 13b are connected by a third bending portion.

[0067] Specifically, the second empty foil area 13 is an integral structure, which can be folded to the side of the third lead-out section 13a away from the center of the roll core by bending the second empty foil area 13. After bending, the third lead-out section 13a and the fourth lead-out section 13b are connected to each other to form a third bending portion, which is simple in structure and easy to produce.

[0068] In some embodiments of the present application, the third lead-out section 13a is provided with a fourth bending portion, and in the case where the third bending portion and the fourth bending portion are flattened, the third lead-out section 13a and the fourth lead-out section 13b are distributed along the width direction of the pole piece 10.

[0069] That is, the third lead-out section 13a and the fourth lead-out section 13b are obtained by bending the second empty foil area 13 multiple times. When the second empty foil area 13 is in a flattened state, the first empty foil area 11 is a long strip structure extending along the width direction of the pole piece 10, and the third lead-out section 13a and the fourth lead-out section 13b are distributed along the width direction of the pole piece 10. By bending the second empty foil area 13, a third lead-out section 13a with a fourth bending portion can be formed. The third lead-out section 13a is approximately rectangular in structure, and at this time the fourth lead-out section 13b is located on one side of the third lead-out section 13a in the width direction of the pole piece 10. After the first adhesive paper 30 is bonded, the fourth lead-out section 13b can be folded to the side of the roll core by bending the second empty foil area 13.

[0070] In the present embodiment, the third lead-out section 13a and the fourth lead-out section 13b can be obtained by bending the second empty foil area 13, which is simple in structure and easy to produce.

[0071] According to one embodiment of the utility model, the winding core is configured to be flat, the length of the winding core is greater than the width of the winding core, the width direction of the winding core is the same as the width direction of the pole piece 10, and the first tab 20 is arranged on the side of the length direction of the winding core.

[0072] In the related art, the winding core used by the long strip-shaped battery is similar to that of the button cell, and the tab is generally led out from the end face of the winding core, and the short end face of the battery is used as the tab leading-out face, but such a winding core will result in low space utilization and reduced battery capacity.

[0073] Therefore, the winding core of the embodiment is designed to be flat, the width direction of the winding core is the same as the width direction of the pole piece 10, and the length of the winding core is greater than the width of the winding core, so that a longer winding core can be prepared by using a pole piece 10 with a smaller width. The first tab 20 can be arranged on one side of the length direction of the winding core, so that the first tab can be led out from the end face of the battery in the length direction (i.e., the length extension direction), thereby facilitating the full use of the internal space of the battery and improving the battery capacity.

[0074] In summary, according to the winding core 100 of the embodiment of the utility model, by connecting the second leading-out section 11b connected with the first tab 20 and the first leading-out section 11a on one side of the width direction of the pole piece 10, when the first tab 20 is led out from the side of the winding core, the first adhesive paper 30 can also fix the end position of the winding core corresponding to the first leading-out section 11a in the winding direction of the winding core, thereby increasing the fixing range, so that the structural stability of the winding core 100 can be effectively improved, the risk of the winding core 100 being scattered can be reduced, and the performance and safety of the battery can be ensured.

[0075] The embodiment of the utility model also provides a battery, which can be a curved battery or a long strip-shaped battery, and the battery comprises the winding core 100 described in any of the above embodiments. Since the winding core 100 according to the embodiment of the application has the above technical effects, the battery according to the embodiment of the application also has corresponding technical effects, and the embodiment will not be described again.

[0076] The embodiment of the utility model also provides an electronic device, for example, but not limited to, a mobile phone, a car, an electric vehicle, etc., and the electronic device comprises the battery described in the above embodiments. Since the battery according to the embodiment of the utility model has the above technical effects, the electronic device according to the embodiment of the utility model also has corresponding technical effects, and the embodiment will not be described again.

[0077] While specific embodiments of the application have been described in detail, those familiar with the art will appreciate that the examples given are by way of example and are not meant to limit the scope of the application. Those skilled in the art will recognize or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the application described herein. It is therefore intended that the scope of the application be determined by the following claims.

Claims

1. A battery cell, characterized in that, include: The core includes a wound electrode sheet (10), the electrode sheet (10) having a main body area and a first empty foil area (11), the first empty foil area (11) being located at the end of the main body area; The first empty foil area (11) includes a first lead-out section (11a) and a second lead-out section (11b). The first lead-out section (11a) is connected to the main body area, and the second lead-out section (11b) is connected to the first lead-out section (11a) on one side of the electrode sheet (10) in the width direction. The second lead-out section (11b) is located on the side of the first lead-out section (11a) away from the center of the core. The first pole tab (20) is disposed on the side of the winding core, and the first end of the first pole tab (20) is connected to the second lead-out section (11b); A first adhesive tape (30) is attached to the side of the core, the first adhesive tape (30) covers the end of the core, and a portion of the first adhesive tape (30) is located between the first lead-out section (11a) and the second lead-out section (11b).

2. The battery cell according to claim 1, characterized in that, The connection length between the first lead-out segment (11a) and the main body region is less than or equal to the width of the electrode (10).

3. The battery cell according to claim 1, characterized in that, The first lead-out section (11a) and the second lead-out section (11b) are connected by a first bend.

4. The battery cell according to claim 3, characterized in that, The first lead-out section (11a) is provided with a second bend. When the first bend and the second bend are flattened, the first lead-out section (11a) and the second lead-out section (11b) are distributed along the length or width direction of the electrode (10).

5. The battery cell according to claim 1, characterized in that, The battery cell also includes: The second adhesive tape (40) is bonded to the side of the first adhesive tape (30) away from the center of the core, and the first end of the second lead-out section (11b) and the first end of the first tab (20) are located between the second adhesive tape (40) and the first adhesive tape (30).

6. The battery cell according to claim 1, characterized in that, The main body area includes two terminal ends, each of which is connected to a first electrode tab (20), and the two first electrode tabs (20) are stacked together.

7. The battery cell according to claim 1, characterized in that, The main body region includes a plurality of active regions (12) distributed along its winding direction and a second empty foil region (13), the second empty foil region (13) being connected between two of the active regions (12). The second empty foil area (13) includes a third lead-out section (13a) and a fourth lead-out section (13b). The third lead-out section (13a) is connected to the active area (12), and the fourth lead-out section (13b) is connected to the third lead-out section (13a) on one side of the electrode sheet (10) in the width direction. The fourth lead-out section (13b) is located on the side of the winding core. The cell also includes: The second electrode tab is located on the side of the winding core. The first end of the second electrode tab is connected to the fourth lead-out section (13b). The second electrode tab is stacked and connected to the first electrode tab (20).

8. The battery cell according to claim 7, characterized in that, The connection length between the third lead-out section (13a) and the active region (12) is less than the width of the electrode (10).

9. The battery cell according to claim 7, characterized in that, The third lead-out section (13a) and the fourth lead-out section (13b) are connected by a third bend.

10. The battery cell according to claim 9, characterized in that, The third lead-out section (13a) is provided with a fourth bend. When the third bend and the fourth bend are flattened, the third lead-out section (13a) and the fourth lead-out section (13b) are distributed along the width direction of the electrode (10).

11. The battery cell according to claim 1, characterized in that, The core is configured to be flat, the length of the core is greater than the width of the core, the width direction of the core is the same as the width direction of the electrode (10), and the first electrode tab (20) is provided on the side of the core in the length direction.

12. A battery, characterized in that, Includes the battery cell according to any one of claims 1 to 11.

13. The battery according to claim 12, characterized in that, The battery is a curved battery or a long strip battery.

14. An electronic device, characterized in that, Includes the battery as described in claim 12 or 13.

Images