Wound battery cell and battery having the same

Abstract

The present invention provides a wound battery cell and a battery having the same. The wound battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator stacked and wound along a winding direction. A first electrode tab, a second electrode tab, and multiple third electrode tabs are spaced apart along the winding direction on the positive electrode sheet, and the multiple third electrode tabs are connected to form a first combined electrode tab. A fourth electrode tab, a fifth electrode tab, and multiple sixth electrode tabs are spaced apart along the winding direction on the negative electrode sheet, and the multiple sixth electrode tabs are connected to form a second combined electrode tab. At least one of the first electrode tab, the second electrode tab, and the first combined electrode tab forms a positive electrode, and at least one of the fourth electrode tab, the fifth electrode tab, and the second combined electrode tab forms a negative electrode. Therefore, the wound battery cell of the present invention is applicable to a variety of usage scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a wound battery core and a battery having the same. Background Art

[0002] The wound cells currently on the market can usually only form batteries with specific performance, for example, forming batteries with higher fast charging performance or forming batteries with higher fast discharging performance. In other words, a wound cell with a single structure can only be used in a single scenario. When the usage scenario needs to be changed, for example, from a scenario with high requirements for fast charging performance to a scenario with high requirements for fast discharging performance, the structure of the wound cell needs to be changed. Therefore, the wound cells in the related art have the problem of a single application scenario. Summary of the Invention

[0003] In order to solve the problem of single application scenario of wound battery cells in the related art, the present invention provides a wound battery cell and a battery having the same.

[0004] The wound battery cell of the embodiment of the present invention includes a positive electrode sheet, a negative electrode sheet and a separator, wherein the positive electrode sheet, the separator and the negative electrode sheet are stacked and wound along a winding direction to form the wound battery cell;

[0005] The positive electrode sheet is provided with a first electrode tab, a second electrode tab and a plurality of third electrode tabs spaced apart along the winding direction, wherein the first electrode tab is provided at a starting end or a tail end of the positive electrode sheet;

[0006] The second electrode tab and the plurality of third electrode tabs are all arranged between the starting end and the tail end of the positive electrode sheet;

[0007] A plurality of the third tabs are connected to form a first combined tab;

[0008] A fourth electrode tab, a fifth electrode tab, and a plurality of sixth electrode tabs are arranged on the negative electrode sheet at intervals along the winding direction, and the fourth electrode tab is arranged at the beginning or the end of the negative electrode sheet;

[0009] The fifth electrode tab and the plurality of sixth electrode tabs are all arranged between the starting end and the tail end of the negative electrode sheet;

[0010] A plurality of the sixth tabs are connected to form a second combined tab;

[0011] At least one of the first electrode tab, the second electrode tab, and the first combined electrode tab forms a positive electrode;

[0012] At least one of the fourth electrode tab, the fifth electrode tab, and the second combined electrode tab forms a negative electrode.

[0013] It can be understood that the wound battery cell of the embodiment of the present invention is provided with a first electrode tab, a second electrode tab and a plurality of third electrode tabs on the positive electrode sheet, and a fourth electrode tab, a fifth electrode tab and a sixth electrode tab on the negative electrode sheet.

[0014] When manufacturing a battery, the corresponding tab can be used as a positive electrode or a negative electrode according to the performance requirements of the battery.

[0015] For example, the second tab of the positive electrode sheet is used as the positive electrode, and the second combined tab formed by the multiple sixth tabs of the negative electrode sheet is used as the negative electrode. As a result, the internal resistance of the positive electrode side of the battery is greater than the resistance of the negative electrode side of the battery, which can improve the charging capacity of the battery, so that the battery has higher charging performance and can adapt to scenarios with high requirements for charging performance.

[0016] For example, the multiple third tabs of the positive electrode sheet are formed into a second combined tab as the positive electrode, and the fifth tab of the negative electrode sheet is used as the negative electrode. As a result, the internal resistance of the negative electrode side of the battery is greater than the internal resistance of the positive electrode side of the battery, which can improve the discharge capacity of the battery, so that the battery has higher discharge performance and can adapt to scenarios with high requirements for charging performance.

[0017] Therefore, the wound battery cell according to the embodiment of the present invention has the characteristic of being applicable to various usage scenarios.

[0018] In some embodiments, the second tab forms a positive electrode, the second combined tab forms a negative electrode, or

[0019] The first tab forms a positive electrode, the fifth tab forms a negative electrode, or

[0020] The first tab forms a positive electrode, and the second combined tab forms a negative electrode, or

[0021] The first electrode tab and the second electrode tab form a positive electrode, and the second combined electrode tab forms a negative electrode, or

[0022] The first combined tab forms a positive electrode, and the fifth tab forms a negative electrode, or

[0023] The first combined tab forms a positive electrode, and the fourth tab forms a negative electrode, or

[0024] The second tab forms a positive electrode, the fourth tab forms a negative electrode, or

[0025] The first combined electrode tab forms a positive electrode, and the fourth electrode tab and the fifth electrode tab form a negative electrode.

[0026] In some embodiments, in the thickness direction of the wound battery core, a plurality of the third tabs are spaced apart;

[0027] In the thickness direction of the wound battery core, a plurality of the sixth tabs are arranged at intervals.

[0028] In some embodiments, in the winding direction, a positive electrode empty foil area is provided at the starting end or the tail end of the positive electrode sheet, and the first electrode tab is provided at the positive electrode empty foil area at the starting end or the tail end of the positive electrode sheet;

[0029] In the winding direction, a negative electrode empty foil area is provided at the starting end or the tail end of the negative electrode sheet, and the fourth electrode tab is provided at the negative electrode empty foil area at the starting end or the tail end of the negative electrode sheet.

[0030] In some embodiments, the first fold and the first corner of the positive electrode sheet are the positive electrode empty foil area, and the second fold of the positive electrode sheet is the double-faced fabric area;

[0031] The first electrode tab is provided at the positive electrode empty foil area at the starting end of the positive electrode sheet, and a first adhesive tape and a second adhesive tape are provided on both sides of the first corner of the positive electrode sheet respectively;

[0032] One side of the first adhesive tape extends to the end portion on the double-surface area of ​​the positive electrode sheet, and the other side covers the first electrode tab;

[0033] One side of the second adhesive tape extends to the end portion on the double-surface area of ​​the positive electrode sheet, and the other side covers the positive electrode empty foil area located on the back of the first tab.

[0034] In some embodiments, the first fold of the negative electrode sheet is the negative electrode empty foil area, the first corner, the second fold, the second corner, the third fold, and the third corner of the negative electrode sheet are single fabric areas, and the fourth fold of the negative electrode sheet is a double fabric area;

[0035] The fourth electrode tab is arranged on the area of ​​the negative electrode empty foil area at the starting end of the negative electrode sheet extending out of the positive electrode sheet; a third adhesive tape covering the fourth electrode tab is provided on the negative electrode sheet.

[0036] In some embodiments, the first fold and the third fold of the negative electrode sheet are provided with a fourth adhesive tape and a fifth adhesive tape, respectively; in the width direction of the wound battery cell, the fourth adhesive tape and the fifth adhesive tape are located between the first electrode tab and the fourth electrode tab;

[0037] The edge area of ​​the fourth adhesive tape is overlapped with the edge area of ​​the second adhesive tape;

[0038] The edge area of ​​the fifth adhesive tape overlaps with the edge area of ​​the first adhesive tape.

[0039] In some embodiments, in the winding direction, a positive electrode tab groove is provided between the starting end and the tail end of the positive electrode sheet, and the second electrode tab is provided in the positive electrode tab groove; a sixth adhesive tape covering the second electrode tab is provided on the positive electrode sheet; and a seventh adhesive tape is provided on the negative electrode sheet in an area opposite to the sixth adhesive tape;

[0040] In the winding direction, a negative electrode tab groove is provided between the starting end and the tail end of the negative electrode sheet, and the fourth tab is provided in the negative electrode tab groove; an eighth tape covering the fourth tab is provided on the negative electrode sheet; and a ninth tape is provided on the area of ​​the positive electrode sheet facing the eighth tape.

[0041] In some embodiments, the plurality of third tabs and the plurality of sixth tabs are die-cut tabs.

[0042] The present invention also provides a battery, comprising the wound battery cell as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 Schematic diagram of the structure of a wound battery cell according to an embodiment of the present invention;

[0045] Figure 2 1 is an expanded view of the positive electrode sheet according to an embodiment of the present invention;

[0046] Figure 3 1 is an expanded view of the negative electrode sheet according to an embodiment of the present invention.

[0047] In the picture:

[0048] 1. Positive electrode;

[0049] 2. Negative electrode;

[0050] 3. Diaphragm;

[0051] 4. First tab;

[0052] 5. Second tab;

[0053] 6. The third tab;

[0054] 7. Fourth pole tab;

[0055] 8. Fifth tab;

[0056] 9. Sixth tab;

[0057] 10. Empty foil area of ​​positive electrode;

[0058] 11. Negative electrode empty foil area;

[0059] 12. First adhesive tape;

[0060] 13. Second adhesive tape;

[0061] 14. Third adhesive tape;

[0062] 15. Fourth adhesive tape;

[0063] 16. Fifth adhesive tape;

[0064] 17. Positive electrode lug slot;

[0065] 18. Sixth adhesive tape;

[0066] 19. Seventh adhesive tape;

[0067] 20. Negative electrode tab slot;

[0068] 21. Eighth adhesive tape;

[0069] 22. The ninth adhesive tape. DETAILED DESCRIPTION

[0070] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0071] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0072] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary, such as by glue injection between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0073] The following is combined with Figure 1-3 A wound battery cell according to an embodiment of the present invention is described.

[0074] The wound battery cell of the embodiment of the present invention includes a positive electrode sheet 1, a negative electrode sheet 2 and a separator 3, wherein the positive electrode sheet 1, the separator 3 and the negative electrode sheet 2 are stacked and wound along a winding direction to form a wound battery cell;

[0075] A first electrode tab 4, a second electrode tab 5 and a plurality of third electrode tabs 6 are arranged on the positive electrode sheet 1 at intervals along the winding direction. The first electrode tab 4 is arranged at the beginning or end of the positive electrode sheet 1.

[0076] The second electrode tab 5 and the plurality of third electrode tabs 6 are arranged between the starting end and the tail end of the positive electrode sheet 1;

[0077] A plurality of third tabs 6 are connected to form a first combined tab;

[0078] A fourth electrode tab 7, a fifth electrode tab 8 and a plurality of sixth electrode tabs 9 are arranged on the negative electrode sheet 2 at intervals along the winding direction, and the fourth electrode tab 7 is arranged at the beginning or end of the negative electrode sheet 2;

[0079] The fifth electrode tab 8 and the plurality of sixth electrode tabs 9 are arranged between the starting end and the tail end of the negative electrode sheet 2;

[0080] A plurality of sixth tabs 9 are connected to form a second combined tab;

[0081] At least one of the first electrode tab 4, the second electrode tab 5, and the first combined electrode tab forms a positive electrode;

[0082] At least one of the fourth electrode tab 7 , the fifth electrode tab 8 , and the second combined electrode tab forms a negative electrode.

[0083] It can be understood that the wound battery cell of the embodiment of the present invention is provided with a first pole tab 4, a second pole tab 5 and a plurality of third pole tabs 6 on the positive electrode sheet 1, and the plurality of third pole tabs 6 are connected to form a first combined pole tab, and a fourth pole tab 7, a fifth pole tab 8 and a plurality of sixth pole tabs 9 are provided on the negative electrode sheet 2, and the plurality of sixth pole tabs 9 are connected to form a second combined pole tab. When manufacturing the battery, the corresponding pole tabs can be used as the positive electrode or the negative electrode according to the performance requirements of the battery.

[0084] For example, the second tab 5 of the positive electrode sheet 1 is used as the positive electrode, and the second combined tab formed by the multiple sixth tabs 9 of the negative electrode sheet 2 is used as the negative electrode. As a result, the internal resistance of the positive electrode side of the battery is greater than the resistance of the negative electrode side of the battery, which can improve the charging capacity of the battery, so that the battery has higher charging performance and can adapt to scenarios with high requirements for charging performance.

[0085] For example, the multiple third tabs 6 of the positive electrode sheet 1 are formed into a second combined tab as a positive electrode, and the fifth tab 8 of the negative electrode sheet 2 is used as a negative electrode. As a result, the internal resistance of the negative electrode side of the battery is greater than the internal resistance of the positive electrode side of the battery, which can improve the discharge capacity of the battery, so that the battery has higher discharge performance and can adapt to scenarios with high requirements for charging performance.

[0086] Therefore, the wound battery cell according to the embodiment of the present invention has the characteristic of being applicable to various usage scenarios.

[0087] In some embodiments, the second electrode tab 5 forms a positive electrode, and the second combined electrode tab forms a negative electrode.

[0088] It can be understood that the internal resistance of the positive electrode side of the battery formed by the wound battery cell of this embodiment is greater than the internal resistance of the negative electrode side, which can greatly improve the battery charging capacity and thus greatly improve the battery's fast charging performance.

[0089] In some embodiments, the first electrode tab 4 forms a positive electrode, and the fifth electrode tab 8 forms a negative electrode.

[0090] It can be understood that the internal resistance of the positive electrode side of the battery formed by the wound battery cell of this embodiment is greater than the internal resistance of the negative electrode side, which can greatly improve the battery charging capacity and thus greatly improve the battery's fast charging performance.

[0091] In some embodiments, the first electrode tab 4 forms a positive electrode, and the second combined electrode tab forms a negative electrode.

[0092] It can be understood that the internal resistance of the positive electrode side of the battery formed by the wound battery cell of this embodiment is greater than the internal resistance of the negative electrode side, which can greatly improve the battery charging capacity and thus greatly improve the battery's fast charging performance.

[0093] In some embodiments, the first electrode tab 4 and the second electrode tab 5 form a positive electrode, and the second combined electrode tab forms a negative electrode.

[0094] It can be understood that the internal resistance of the positive electrode side of the battery formed by the wound battery cell of this embodiment is greater than the internal resistance of the negative electrode side, which can greatly improve the battery charging capacity and thus greatly improve the battery's fast charging performance.

[0095] In some embodiments, the first combined tab forms a positive electrode, and the fifth tab 8 forms a negative electrode.

[0096] It can be understood that the internal resistance of the negative electrode side of the battery made of the wound battery cell of this embodiment is greater than the internal resistance of the positive electrode side, which can greatly improve the battery discharge capacity and thus greatly improve the battery's fast discharge performance.

[0097] In some embodiments, the first combined tab forms a positive electrode, and the fourth tab 7 forms a negative electrode.

[0098] It can be understood that the internal resistance of the negative electrode side of the battery made of the wound battery cell of this embodiment is greater than the internal resistance of the positive electrode side, which can greatly improve the battery discharge capacity and thus greatly improve the battery's fast discharge performance.

[0099] In some embodiments, the second electrode tab 5 forms a positive electrode, and the fourth electrode tab 7 forms a negative electrode.

[0100] It can be understood that the internal resistance of the negative electrode side of the battery made of the wound battery cell of this embodiment is greater than the internal resistance of the positive electrode side, which can greatly improve the battery discharge capacity and thus greatly improve the battery's fast discharge performance.

[0101] In some embodiments, the first combined tab forms a positive electrode, and the fourth tab 7 and the fifth tab 8 form a negative electrode.

[0102] It can be understood that the internal resistance of the negative electrode side of the battery made of the wound battery cell of this embodiment is greater than the internal resistance of the positive electrode side, which can greatly improve the battery discharge capacity and thus greatly improve the battery's fast discharge performance.

[0103] In some embodiments, as Figure 1 As shown, a plurality of third electrode tabs 6 are arranged at intervals in the thickness direction of the wound battery cell.

[0104] The wound battery cell of the embodiment of the present invention can facilitate the formation of the first combined electrode tab by arranging the plurality of third electrode tabs 6 at intervals in the thickness direction of the wound battery cell.

[0105] In some embodiments, as Figure 1 As shown, a plurality of sixth tabs 9 are arranged at intervals in the thickness direction of the wound battery cell.

[0106] The wound battery cell of the embodiment of the present invention can facilitate the formation of the second combined electrode tab by arranging the plurality of sixth electrode tabs 9 at intervals in the thickness direction of the wound battery cell.

[0107] In some embodiments, as Figure 2 As shown, in the winding direction, a positive electrode empty foil area 10 is provided at the starting end or the tail end of the positive electrode sheet 1, and the first electrode tab 4 is provided at the positive electrode empty foil area 10 at the starting end or the tail end of the positive electrode sheet 1;

[0108] It can be understood that the positive electrode empty foil area 10 of the positive electrode sheet 1 is an area in the width direction of the positive electrode sheet 1 where no positive electrode active material is coated.

[0109] like Figure 3 As shown, in the winding direction, a negative electrode empty foil area 11 is provided at the beginning or the end of the negative electrode sheet 2 , and the fourth electrode tab 7 is provided at the negative electrode empty foil area 11 at the beginning or the end of the negative electrode sheet 2 .

[0110] It can be understood that the negative electrode empty foil area 11 of the negative electrode sheet 2 is an area in the width direction of the negative electrode sheet 2 where no negative electrode active material is coated.

[0111] In some embodiments, the first fold and the first corner of the positive electrode sheet 1 are the positive electrode empty foil area 10, and the second fold of the positive electrode sheet 1 is the double-faced fabric area;

[0112] The first electrode tab 4 is provided at the positive electrode empty foil area 10 at the beginning of the positive electrode sheet 1. A first adhesive tape 12 and a second adhesive tape 13 are provided on both sides of the first corner of the positive electrode sheet 1 respectively.

[0113] One side of the first adhesive tape 12 extends to the end portion on the double-surface area of ​​the positive electrode sheet 1 , and the other side of the first adhesive tape 12 covers the first electrode tab 4 ;

[0114] One side of the second adhesive tape 13 extends to the end portion on the double-faced fabric area of ​​the positive electrode sheet 1 , and the other side of the second adhesive tape 13 covers the positive electrode empty foil area 10 located on the back of the first electrode tab 4 .

[0115] The wound battery cell of the embodiment of the present invention can prevent the first tab 4 from piercing the diaphragm and causing a battery short circuit by setting the first adhesive tape 12 and the second adhesive tape 13, and can also make up for the thickness of the positive electrode empty foil area 10, thereby reducing the thickness difference between the positive electrode empty foil area 10 and the double-surface fabric area at the starting end of the positive electrode sheet 1.

[0116] In some embodiments, the first fold of the negative electrode sheet 2 is the negative electrode empty foil area 11, the first corner, the second fold, the second corner, the third fold, and the third corner of the negative electrode sheet 2 are single-faced fabric areas, and the fourth fold of the negative electrode sheet 2 is a double-faced fabric area;

[0117] The fourth electrode tab 7 is provided on the area of ​​the negative electrode empty foil area 11 at the beginning of the negative electrode sheet 2 extending out of the positive electrode sheet 1 ; a third adhesive tape 14 covering the fourth electrode tab 7 is provided on the negative electrode sheet 2 .

[0118] The wound battery cell of the embodiment of the present invention can prevent the fourth tab 7 from piercing the separator and causing a battery short circuit by providing the third adhesive tape 14 .

[0119] In some embodiments, the first fold and the third fold of the negative electrode sheet 2 are respectively provided with a fourth adhesive tape 15 and a fifth adhesive tape 16; in the width direction of the wound battery cell, the fourth adhesive tape 15 and the fifth adhesive tape 16 are located between the first pole tab 4 and the fourth pole tab 7; the edge area of ​​the fourth adhesive tape 15 is stacked with the edge area of ​​the second adhesive tape; the edge area of ​​the fifth adhesive tape 16 is stacked with the edge area of ​​the first adhesive tape 12.

[0120] The wound battery cell of the embodiment of the present invention is provided with a fourth adhesive tape 15 and a fifth adhesive tape 16. The fourth adhesive tape 15 and the fifth adhesive tape 16 can cover the exposed aluminum foil of the positive electrode empty foil area 10, thereby preventing the exposed aluminum foil of the positive electrode empty foil area 10 from piercing the diaphragm and directly contacting the negative electrode to cause a short circuit.

[0121] In some embodiments, in the winding direction, a positive electrode tab groove 17 is provided between the starting end and the tail end of the positive electrode sheet 1 , and the second tab 5 is provided in the positive electrode tab groove 17 ;

[0122] It can be understood that the positive electrode tab groove 17 of the positive electrode sheet 1 is an area between the starting end and the tail end of the positive electrode sheet 1 that is not coated with active material. Specifically, the positive electrode tab groove 17 of the positive electrode sheet 1 is a groove extending inward from the side edge of the positive electrode sheet 1 in its width direction, and the groove does not pass through the positive electrode sheet 1 in the width direction of the positive electrode sheet 1.

[0123] A sixth adhesive tape 18 covering the second electrode tab 5 is provided on the positive electrode sheet 1; a seventh adhesive tape 19 is provided on the negative electrode sheet 2 in the area facing the sixth adhesive tape 18;

[0124] In the winding direction, a negative electrode tab slot 20 is provided between the starting end and the tail end of the negative electrode sheet 2, and the fourth tab 7 is provided in the negative electrode tab slot 20;

[0125] It can be understood that the negative electrode tab groove 20 of the negative electrode sheet 2 is the area between the starting end and the tail end of the negative electrode sheet 2 that is not coated with active material. Specifically, the negative electrode tab groove 20 of the negative electrode sheet 2 is a groove extending inward from the side edge of the negative electrode sheet 2 in its width direction, and the groove does not pass through the negative electrode sheet 2 in the width direction of the negative electrode sheet 2.

[0126] An eighth adhesive tape 21 covering the fourth electrode tab 7 is provided on the negative electrode sheet 2 ; a ninth adhesive tape 22 is provided on the positive electrode sheet 1 in an area corresponding to the eighth adhesive tape 21 .

[0127] The wound battery cell of the embodiment of the present invention is provided with a sixth tape 18 covering the second pole tab 5 on the positive electrode sheet 1; a seventh tape 19 is provided on the negative electrode sheet 2 in an area corresponding to the sixth tape 18; an eighth tape 21 covering the fourth pole tab 7 is provided on the negative electrode sheet 2; and a ninth tape 22 is provided on the positive electrode sheet 1 in an area corresponding to the eighth tape 21, so as to avoid the formation of lithium dendrites around the second pole tab 5 and the fourth pole tab 7, and prevent the second pole tab 5 and the fourth pole tab 7 from piercing the diaphragm and causing a battery short circuit.

[0128] In some embodiments, the plurality of third electrode tabs 6 and the plurality of sixth electrode tabs 9 are die-cut electrode tabs.

[0129] The wound battery cell of the embodiment of the present invention can further reduce the internal resistance of the third pole tabs 6 and the sixth pole tabs 9 by making the plurality of third pole tabs 6 and the plurality of sixth pole tabs 9 die-cut pole tabs.

[0130] An embodiment of the present invention further provides a battery, comprising the wound battery cell of the above embodiment.

[0131] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A wound battery cell, characterized in that: Comprising a positive electrode sheet (1), a negative electrode sheet (2) and a separator (3), wherein the positive electrode sheet (1), the separator (3) and the negative electrode sheet (2) are stacked and wound along a winding direction to form the wound battery core; A first pole tab (4), a second pole tab (5) and a plurality of third pole tabs (6) are arranged on the positive electrode sheet (1) at intervals along the winding direction, and the first pole tab (4) is arranged at the beginning or the end of the positive electrode sheet (1); The second pole tab (5) and the plurality of third pole tabs (6) are all arranged between the starting end and the tail end of the positive electrode sheet (1); A plurality of the third tabs (6) are connected to form a first combined tab; A fourth pole tab (7), a fifth pole tab (8) and a plurality of sixth pole tabs (9) are arranged on the negative electrode sheet (2) at intervals along the winding direction, and the fourth pole tab (7) is arranged at the beginning or the end of the negative electrode sheet (2); The fifth pole tab (8) and the plurality of sixth pole tabs (9) are all arranged between the starting end and the tail end of the negative electrode sheet (2); A plurality of the sixth tabs (9) are connected to form a second combined tab; At least one of the first electrode tab (4), the second electrode tab (5), and the first combined electrode tab forms a positive electrode; At least one of the fourth pole tab (7), the fifth pole tab (8), and the second combined pole tab forms a negative electrode; In the winding direction, a positive electrode empty foil area (10) is provided at the starting end or the tail end of the positive electrode sheet (1), and the first electrode tab (4) is provided at the positive electrode empty foil area (10) at the starting end or the tail end of the positive electrode sheet (1); In the winding direction, a negative electrode empty foil area (11) is provided at the starting end or the tail end of the negative electrode sheet (2), and the fourth electrode tab (7) is provided at the negative electrode empty foil area (11) at the starting end or the tail end of the negative electrode sheet (2); In the winding direction, a positive electrode tab slot (17) is provided between the starting end and the tail end of the positive electrode sheet (1), and the second tab (5) is provided in the positive electrode tab slot (17); In the winding direction, a negative electrode tab slot (20) is provided between the starting end and the tail end of the negative electrode sheet (2), and the fourth tab (7) is provided in the negative electrode tab slot (20); The plurality of third pole tabs (6) and the plurality of sixth pole tabs (9) are all die-cut pole tabs.

2. The wound battery cell according to claim 1, characterized in that The second tab (5) forms a positive electrode, and the second combined tab forms a negative electrode, or The first electrode tab (4) forms a positive electrode, and the fifth electrode tab (8) forms a negative electrode, or The first tab (4) forms a positive electrode, and the second combined tab forms a negative electrode, or The first electrode tab (4) and the second electrode tab (5) form a positive electrode, and the second combined electrode tab forms a negative electrode, or The first combined tab forms a positive electrode, and the fifth tab (8) forms a negative electrode, or The first combined tab forms a positive electrode, and the fourth tab (7) forms a negative electrode, or The second electrode tab (5) forms a positive electrode, and the fourth electrode tab (7) forms a negative electrode, or The first combined pole tab forms a positive electrode, and the fourth pole tab (7) and the fifth pole tab (8) form a negative electrode.

3. The wound battery cell according to claim 1, characterized in that In the thickness direction of the wound battery core, a plurality of third tabs (6) are arranged at intervals; In the thickness direction of the wound battery core, a plurality of the sixth pole tabs (9) are arranged at intervals.

4. The wound battery cell according to claim 1, characterized in that The first fold and the first corner of the positive electrode sheet (1) are the positive electrode empty foil area (10), and the second fold of the positive electrode sheet (1) is the double-faced fabric area; The first electrode tab (4) is provided at the positive electrode empty foil area (10) at the starting end of the positive electrode sheet (1), and a first adhesive tape (12) and a second adhesive tape (13) are provided on both sides of the first corner of the positive electrode sheet (1); One side of the first adhesive tape (12) extends to the end portion of the double-surface area of ​​the positive electrode sheet (1), and the other side covers the first electrode tab (4); One side of the second adhesive tape (13) extends to the end portion on the double-surface area of ​​the positive electrode sheet (1), and the other side covers the positive electrode empty foil area (10) located on the back of the first electrode tab (4).

5. The wound battery cell according to claim 4, characterized in that: The first fold of the negative electrode sheet (2) is the negative electrode empty foil area (11), the first corner, the second fold, the second corner, the third fold, and the third corner of the negative electrode sheet (2) are single-fabric areas, and the fourth fold of the negative electrode sheet (2) is a double-fabric area; The fourth electrode tab (7) is provided on the area of ​​the negative electrode empty foil area (11) at the starting end of the negative electrode sheet (2) extending out of the positive electrode sheet (1); and a third adhesive tape (14) covering the fourth electrode tab (7) is provided on the negative electrode sheet (2).

6. The wound battery cell according to claim 5, characterized in that: The first fold and the third fold of the negative electrode sheet (2) are provided with a fourth adhesive tape (15) and a fifth adhesive tape (16), respectively; in the width direction of the wound battery cell, the fourth adhesive tape (15) and the fifth adhesive tape (16) are located between the first pole tab (4) and the fourth pole tab (7); The edge area of ​​the fourth adhesive tape (15) is laminated with the edge area of ​​the second adhesive tape (13); The edge area of ​​the fifth adhesive tape (16) is laminated with the edge area of ​​the first adhesive tape (12).

7. The wound battery cell according to claim 1, characterized in that: The positive electrode sheet (1) is provided with a sixth adhesive tape (18) covering the second electrode tab (5); the negative electrode sheet (2) is provided with a seventh adhesive tape (19) in an area opposite to the sixth adhesive tape; An eighth adhesive tape (21) covering the fourth electrode tab (7) is provided on the negative electrode sheet (2); and a ninth adhesive tape (22) is provided on the positive electrode sheet (1) in an area opposite to the eighth adhesive tape.

8. A battery, characterized in that: The invention comprises a wound battery cell as described in any one of claims 1 to 7.

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