Battery roll core structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery roll core structure and a battery. A negative plate; the bipolar plate is arranged between the positive plate and the negative plate; a first negative electrode layer is arranged on one side, close to the positive electrode plate, of the bipolar plate in the thickness direction and is suitable for connecting the bipolar plate and the positive electrode plate in series; a first positive electrode layer is arranged on one side, close to the negative electrode plate, of the bipolar plate in the thickness direction, and the first positive electrode layer is suitable for connecting the bipolar plate and the negative electrode plate in series; the double pole pieces are suitable for being wound together with the positive pole piece and the negative pole piece to form pole group monomers which are internally connected in series. According to the battery roll core structure provided by the utility model, an internal series connection structure of the positive plate, the first negative electrode layer, the first positive electrode layer and the negative plate can be formed in the wound pole group single body, so that the output voltage of the pole group single body is multiplied, and the external series connection of the pole group single body is reduced; and the flexibility of battery grouping is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery coil structure and a battery. Background Art

[0002] Lithium-ion batteries have advantages such as high specific capacity and low self-discharge rate. Since their commercialization, they have been widely used in portable electronic devices, electric vehicles, large energy storage facilities, etc. The winding core of existing cylindrical batteries is a winding structure of positive electrode-diaphragm-negative electrode, and its single cell voltage is between 3V and 4V. In actual use, it is usually necessary to use multiple single cells in series to increase the overall output voltage.

[0003] Therefore, the existing cylindrical battery with a winding structure of positive electrode-diaphragm-negative electrode cannot increase the output voltage and the grouping method is complicated. Utility Model Content

[0004] In view of this, the utility model provides a battery core structure and a battery to solve the problem that the core of the existing cylindrical battery cannot increase the output voltage and the grouping method is complicated.

[0005] In a first aspect, the utility model provides a battery roll core structure, comprising:

[0006] Positive electrode;

[0007] Negative electrode;

[0008] A bipolar sheet is arranged between the positive electrode sheet and the negative electrode sheet; a first negative electrode layer is arranged on one side of the bipolar sheet close to the positive electrode sheet along the thickness direction, and the first negative electrode layer is suitable for connecting the bipolar sheet and the positive electrode sheet in series; a first positive electrode layer is arranged on one side of the bipolar sheet close to the negative electrode sheet along the thickness direction, and the first positive electrode layer is suitable for connecting the bipolar sheet and the negative electrode sheet in series;

[0009] The bipolar sheet is suitable for being wound together with the positive electrode sheet and the negative electrode sheet to form an internally series-connected electrode group monomer.

[0010] Beneficial effect: Compared with the winding core of cylindrical batteries in the related art, the battery winding core structure provided by the utility model arranges a bipolar sheet between the positive electrode sheet and the negative electrode sheet, so that the bipolar sheet is wound together with the positive electrode sheet and the negative electrode sheet to form an electrode group monomer; arranges a first negative electrode layer on the side of the bipolar sheet close to the positive electrode sheet along the thickness direction, and arranges a first positive electrode layer on the side of the bipolar sheet close to the negative electrode sheet along the thickness direction, so that the bipolar sheet and the positive electrode sheet are connected in series through the first negative electrode layer, and the bipolar sheet and the negative electrode sheet are connected in series through the first positive electrode layer, so that the interior of the electrode group monomer after winding forms an internal series structure of positive electrode sheet-first negative electrode layer-first positive electrode layer-negative electrode sheet, which not only doubles the output voltage of the electrode group monomer, but also reduces the series connection outside the electrode group monomer, which is beneficial to improving the flexibility of battery grouping.

[0011] In an optional embodiment, the battery core structure further includes:

[0012] A first diaphragm is disposed between the first negative electrode layer and the positive electrode sheet, one side of the first diaphragm in the thickness direction is suitable for being bonded to the first negative electrode layer, and the other side is suitable for being bonded to the positive electrode sheet;

[0013] The second separator is arranged between the first positive electrode layer and the negative electrode sheet. One side of the second separator in the thickness direction is suitable for being attached to the first positive electrode layer, and the other side is suitable for being attached to the negative electrode sheet.

[0014] Beneficial effects: By setting a first diaphragm between the first negative electrode layer and the positive electrode sheet for isolation, a short circuit caused by direct contact between the first negative electrode layer and the positive electrode sheet is avoided, and ions in the electrolyte solution are allowed to pass freely between the first negative electrode layer and the positive electrode sheet, while electrons between the first negative electrode layer and the positive electrode sheet are prevented from passing freely; by setting a second diaphragm between the first positive electrode layer and the negative electrode sheet, a short circuit caused by direct contact between the first positive electrode layer and the negative electrode sheet is avoided, and ions in the electrolyte solution are allowed to pass freely between the first positive electrode layer and the negative electrode sheet, while electrons between the first positive electrode layer and the negative electrode sheet are prevented from passing freely, thereby ensuring the charge and discharge performance of the electrode group monomer.

[0015] In an optional embodiment, the battery core structure further includes a third diaphragm, which is attached to a side of the negative electrode sheet away from the positive electrode sheet along the thickness direction, and the third diaphragm is suitable for covering the negative electrode sheet during the winding process;

[0016] The third separator is suitable for being wound together with the first separator, the second separator, the bipolar sheet, the positive electrode sheet and the negative electrode sheet to form an internally series-connected electrode group monomer.

[0017] Beneficial effect: During the winding process, the positive electrode sheet is inside the winding core, and the third separator is coated on the outside of the negative electrode sheet, and the third separator is coated on the outside of the winding core during the winding process, thereby forming a series structure inside the winding core of positive electrode sheet-first separator-first negative electrode layer-first positive electrode layer-second separator-negative electrode sheet-third separator. On the one hand, it can avoid the risk of direct contact between the positive and negative electrodes due to process fluctuations, and on the other hand, it can avoid the negative electrode sheet from touching and conducting with the aluminum shell during use, thereby preventing corrosion to the aluminum shell.

[0018] In an optional embodiment, the bipolar sheet further includes a first current collector, and the side of the first current collector close to the positive electrode sheet along the thickness direction is suitable for coating the first negative electrode layer, and the side of the first current collector close to the negative electrode sheet along the thickness direction is suitable for coating the first positive electrode layer.

[0019] Beneficial effect: By setting the first current collector, a carrier is provided for the first negative electrode layer and the first positive electrode layer of the bipolar sheet, and current conduction is achieved during the charge and discharge process.

[0020] In an optional embodiment, the positive electrode sheet includes a second positive electrode layer and a second current collector, and both sides of the second current collector in the thickness direction are suitable for coating the second positive electrode layer.

[0021] Beneficial effect: By providing the second current collector, a carrier is provided for the second positive electrode layer of the positive electrode sheet, and current conduction is achieved during the charge and discharge process.

[0022] In an optional embodiment, the battery core structure further includes a positive electrode connecting sheet;

[0023] A first connection portion is provided on one side of the second current collector in the width direction. The first connection portion is formed by extending from the edge of the second current collector along the width direction away from the second current collector. The first connection portion is suitable for welding or integrally forming with the positive electrode connecting sheet.

[0024] Beneficial effect: By arranging the first connecting portion on one side of the second current collector in the width direction, the first connecting portion facilitates a firm and stable connection with the positive electrode connecting sheet of the subsequent winding core.

[0025] In an optional embodiment, the negative electrode sheet includes a second negative electrode layer and a third current collector, and both sides of the third current collector in the thickness direction are suitable for coating the second negative electrode layer.

[0026] Beneficial effect: By setting the third current collector, a carrier is provided for the second negative electrode layer of the negative electrode sheet, and current conduction is achieved during the charge and discharge process.

[0027] In an optional embodiment, the battery core structure further includes a negative electrode connecting sheet;

[0028] A second connection portion is provided on one side of the third current collector in the width direction. The second connection portion is formed by extending from the edge of the third current collector along the width direction away from the third current collector. The second connection portion is suitable for welding or integrally forming with the negative electrode connecting sheet.

[0029] Beneficial effect: By arranging the second connecting portion on one side of the third current collector in the width direction, the second connecting portion facilitates a firm and stable connection with the negative electrode connecting sheet of the subsequent winding core.

[0030] In an optional embodiment, the first positive electrode layer includes a lithiated positive electrode material, and the lithiated positive electrode material includes lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel manganese oxide, and a lithium-rich manganese matrix;

[0031] The first negative electrode layer includes a negative electrode active material, and the negative electrode active material includes graphite and lithium titanate.

[0032] In a second aspect, the utility model further provides a battery, comprising: a battery body, and the battery core structure as described above.

[0033] Beneficial effects: The battery of the second aspect includes the battery core structure of the first aspect, and therefore, the battery of the second aspect includes all the beneficial effects of the battery core structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a schematic diagram of an exploded structure of a battery winding core structure before winding according to an embodiment of the utility model;

[0036] Figure 2 A schematic diagram of the cross-sectional structure of a bipolar sheet of a battery roll core structure according to an embodiment of the utility model;

[0037] Figure 3 This is a schematic diagram of the main structure of a battery winding core structure before winding according to an embodiment of the utility model;

[0038] Figure 4 Another exploded structural schematic diagram of a battery winding core structure before winding according to an embodiment of the utility model;

[0039] Figure 5 This is a schematic diagram of the cross-sectional structure of a battery winding core structure after winding according to an embodiment of the utility model;

[0040] Figure 6 A schematic diagram of the cross-sectional structure of a positive electrode sheet of a battery roll core structure according to an embodiment of the utility model;

[0041] Figure 7 It is a schematic diagram of the cross-sectional structure of a negative electrode sheet of a battery roll core structure according to an embodiment of the utility model.

[0042] Description of reference numerals:

[0043] 10. positive electrode sheet; 11. second positive electrode layer; 12. second current collector; 121. first connecting portion;

[0044] 20. negative electrode sheet; 21. second negative electrode layer; 22. third current collector; 221. second connecting portion;

[0045] 30. bipolar sheet; 31. first negative electrode layer; 32. first positive electrode layer; 33. first current collector;

[0046] 41. A first diaphragm; 42. A second diaphragm; 43. A third diaphragm. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0048] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0049] According to an embodiment of the present utility model, on the one hand, a battery roll core structure is provided, comprising:

[0050] Positive electrode sheet 10;

[0051] Negative electrode sheet 20;

[0052] The bipolar sheet 30 is disposed between the positive electrode sheet 10 and the negative electrode sheet 20; please combine them together Figure 2 and Figure 5 As shown, a first negative electrode layer 31 is provided on one side of the bipolar sheet 30 close to the positive electrode sheet 10 along the thickness direction, wherein the first negative electrode layer 31 is isolated from the positive electrode sheet 10 by a diaphragm, and the first negative electrode layer 31 is suitable for connecting the bipolar sheet 30 and the positive electrode sheet 10 in series; a first positive electrode layer 32 is provided on one side of the bipolar sheet 30 close to the negative electrode sheet 20 along the thickness direction, wherein the first positive electrode layer 32 is isolated from the negative electrode sheet 20 by a diaphragm, and the first positive electrode layer 32 is suitable for connecting the bipolar sheet 30 and the negative electrode sheet 20 in series;

[0053] The bipolar sheet 30 is suitable for being wound together with the positive electrode sheet 10 and the negative electrode sheet 20 to form an internally connected electrode group monomer.

[0054] It should be noted that the core of the cylindrical battery in the related art is a winding structure of positive electrode-diaphragm-negative electrode, and its single cell voltage is between 3V and 4V. In actual use, it is usually necessary to connect multiple single cells in series to increase the overall output voltage, and the grouping method is complicated.

[0055] Compared with the winding core of the cylindrical battery in the related art, the battery winding core structure provided by the utility model is characterized in that a bipolar sheet 30 is arranged between the positive electrode sheet 10 and the negative electrode sheet 20, so that the bipolar sheet 30 is wound together with the positive electrode sheet 10 and the negative electrode sheet 20 to form an electrode group monomer; a first negative electrode layer 31 is arranged on the side of the bipolar sheet 30 close to the positive electrode sheet 10 along the thickness direction, and a first positive electrode layer 32 is arranged on the side of the bipolar sheet 30 close to the negative electrode sheet 20 along the thickness direction, so that the bipolar sheet 30 and the positive electrode sheet 10 are connected in series through the first negative electrode layer 31, and the bipolar sheet 30 and the negative electrode sheet 20 are connected in series through the first positive electrode layer 32, so that the inside of the electrode group monomer after winding forms an internal series structure of positive electrode sheet 10-first negative electrode layer 31-first positive electrode layer 32-negative electrode sheet 20, which not only doubles the output voltage of the electrode group monomer, but also reduces the series connection outside the electrode group monomer, which is conducive to improving the flexibility of battery grouping.

[0056] In some embodiments, please combine Figure 1 and Figure 4 As shown, the battery core structure also includes:

[0057] The first separator 41 is disposed between the first negative electrode layer 31 and the positive electrode sheet 10. One side of the first separator 41 in the thickness direction is suitable for being bonded to the first negative electrode layer 31, and the other side is suitable for being bonded to the positive electrode sheet 10.

[0058] The second separator 42 is disposed between the first positive electrode layer 32 and the negative electrode sheet 20 . One side of the second separator 42 in the thickness direction is suitable for being bonded to the first positive electrode layer 32 , and the other side is suitable for being bonded to the negative electrode sheet 20 .

[0059] It should be noted that a first separator 41 is provided between the first negative electrode layer 31 and the positive electrode sheet 10 for isolation, so as to avoid direct contact between the first negative electrode layer 31 and the positive electrode sheet 10 to cause a short circuit, and to allow ions in the electrolyte to pass freely between the first negative electrode layer 31 and the positive electrode sheet 10, while preventing electrons from passing freely between the first negative electrode layer 31 and the positive electrode sheet 10; a second separator 42 is provided between the first positive electrode layer 32 and the negative electrode sheet 20, so as to avoid direct contact between the first positive electrode layer 32 and the negative electrode sheet 20 to cause a short circuit, and to allow ions in the electrolyte to pass freely between the first positive electrode layer 32 and the negative electrode sheet 20, while preventing electrons from passing freely between the first positive electrode layer 32 and the negative electrode sheet 20, thereby ensuring the charge and discharge performance of the electrode group monomer.

[0060] In some embodiments, please combine Figure 1 and Figure 4 As shown, the battery core structure further includes a third separator 43, which is attached to the side of the negative electrode sheet 20 away from the positive electrode sheet 10 along the thickness direction, and the third separator 43 is suitable for covering the negative electrode sheet 20 during the winding process;

[0061] The third separator 43 is suitable for being wound together with the first separator 41 , the second separator 42 , the bipolar sheet 30 , the positive electrode sheet 10 and the negative electrode sheet 20 to form an internally connected electrode group monomer.

[0062] It should be noted that the working principle of the third diaphragm 43 is the same as that of the first diaphragm 41 and the second diaphragm 42. Figure 3 As shown, during the winding process, the positive electrode sheet 10 is inside the winding core, and the third separator 43 covers the negative electrode sheet 20 on the outside, and the third separator 43 is covered on the outside of the winding core during the winding process, thereby forming a series structure inside the winding core of positive electrode sheet 10-first separator 41-first negative electrode layer 31-first positive electrode layer 32-second separator 42-negative electrode sheet 20-third separator 43. On the one hand, it can avoid the risk of direct contact between the positive and negative electrodes due to process fluctuations, and on the other hand, it can avoid the negative electrode sheet 20 from touching and conducting with the aluminum shell during use, thereby preventing corrosion to the aluminum shell.

[0063] In some embodiments, see Figure 2 As shown, the bipolar sheet 30 further includes a first current collector 33 , the side of the first current collector 33 close to the positive electrode sheet 10 along the thickness direction is suitable for coating the first negative electrode layer 31 , and the side of the first current collector 33 close to the negative electrode sheet 20 along the thickness direction is suitable for coating the first positive electrode layer 32 .

[0064] It should be noted that the first current collector 33 is a metal foil current collector, and the material of the first current collector 33 can be copper, aluminum, stainless steel, silver or zinc, etc., or a composite material of two or more metals among copper, aluminum, stainless steel, silver, zinc, etc. The first current collector 33 is preferably made of copper, so that the first current collector 33 is not easy to react with lithium to form an alloy, thereby ensuring the normal charge and discharge performance of the bipolar sheet 30 and the entire electrode group monomer.

[0065] In this embodiment, the first current collector 33 is provided to provide a carrier for the first negative electrode layer 31 and the first positive electrode layer 32 of the bipolar sheet 30 , and to achieve current conduction during the charge and discharge process.

[0066] In some embodiments, see Figure 6 As shown, the positive electrode sheet 10 includes a second positive electrode layer 11 and a second current collector 12 , and both sides of the second current collector 12 in the thickness direction are suitable for coating the second positive electrode layer 11 .

[0067] It should be noted that the second current collector 12 is a metal foil current collector, and the material of the second current collector 12 can be aluminum, copper, stainless steel, silver or zinc, etc., or a composite material of two or more metals thereof. The second current collector 12 is preferably made of aluminum, thereby improving the oxidation resistance of the second current collector 12. The second positive electrode layer 11 is a coating layer containing a lithiated positive electrode material, and the lithiated positive electrode material includes lithium nickel cobalt manganese oxide (NMC), lithium iron phosphate (LFP), lithium nickel manganese oxide (LNMO), lithium-rich manganese matrix (LRM), etc.

[0068] In this embodiment, the second current collector 12 is provided to provide a carrier for the second positive electrode layer 11 of the positive electrode sheet 10 and realize current conduction during the charge and discharge process.

[0069] In some embodiments, the battery core structure further includes a positive electrode connecting sheet;

[0070] Please combine Figure 1 and Figure 3 As shown, a first connecting portion 121 is provided on one side of the second current collector 12 in the width direction. The first connecting portion 121 is formed by extending from the edge of the second current collector 12 along the width direction away from the second current collector 12. The first connecting portion 121 is suitable for welding or integrally forming with the positive electrode connecting sheet.

[0071] It should be noted that the first connection portion 121 and the second current collector 12 are integrally formed, and the first connection portion 121 is a metal foil without a coating.

[0072] In this embodiment, the first connecting portion 121 is provided on one side of the second current collector 12 in the width direction, so that the first connecting portion 121 can be firmly and stably connected to the positive electrode connecting sheet of the subsequent winding core.

[0073] In some embodiments, see Figure 7 As shown, the negative electrode sheet 20 includes a second negative electrode layer 21 and a third current collector 22 , and both sides of the third current collector 22 in the thickness direction are suitable for coating the second negative electrode layer 21 .

[0074] It should be noted that the third current collector 22 is a metal foil current collector, and the material of the third current collector 22 can be copper, aluminum, stainless steel, silver or zinc, etc., or a composite material of two or more metals thereof. The third current collector 22 is preferably made of copper. The second negative electrode layer 21 is a coating having a negative electrode active material that can reversibly deintercalate lithium ions, and the negative electrode active material includes graphite, lithium titanate, etc.

[0075] In this embodiment, the third current collector 22 is provided to provide a carrier for the second negative electrode layer 21 of the negative electrode sheet 20 and realize current conduction during the charge and discharge process.

[0076] In some embodiments, the battery core structure further includes a negative electrode connecting sheet;

[0077] Please combine Figure 1 and Figure 3 As shown, a second connection portion 221 is provided on one side of the third current collector 22 in the width direction. The second connection portion 221 is formed by extending the edge of the third current collector 22 along the width direction away from the third current collector 22. The second connection portion 221 is suitable for welding or integrally forming with the negative electrode connecting sheet.

[0078] It should be noted that the second connection portion 221 and the third current collector 22 are integrally formed, and the second connection portion 221 is a metal foil without a coating.

[0079] In this embodiment, the second connecting portion 221 is provided on one side of the third current collector 22 in the width direction, so that the second connecting portion 221 can be firmly and stably connected to the negative electrode connecting sheet of the subsequent winding core.

[0080] In some embodiments, the first positive electrode layer 32 includes a lithiated positive electrode material, and the lithiated positive electrode material includes lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel manganese oxide, and lithium-rich manganese matrix;

[0081] The first negative electrode layer 31 includes a negative electrode active material including graphite and lithium titanate.

[0082] It should be noted that the material of the first positive electrode layer 32 is the same as the coating material of the second positive electrode layer 11. The first positive electrode layer 32 is a coating containing a lithiated positive electrode material, and the lithiated positive electrode material includes lithium nickel cobalt manganese oxide (NMC), lithium iron phosphate (LFP), lithium nickel manganese oxide (LNMO), lithium-rich manganese matrix (LRM), etc. The material of the first negative electrode layer 31 is the same as the coating material of the second negative electrode layer 21. The first negative electrode layer 31 is a coating containing a negative electrode active material that can reversibly deintercalate lithium ions, and the negative electrode active material includes graphite, lithium titanate, etc.

[0083] According to an embodiment of the present invention, on the other hand, a battery is provided, including: a battery body, and the battery core structure as described above.

[0084] The battery in this solution includes the battery core structure described above, and therefore, the battery in this solution includes all the beneficial effects of the battery core structure described above.

[0085] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery core structure, characterized in that: include: Positive electrode; Negative electrode; A bipolar plate, disposed between the positive electrode plate and the negative electrode plate; A first negative electrode layer is provided on one side of the bipolar sheet close to the positive electrode sheet in the thickness direction, and the first negative electrode layer is suitable for connecting the bipolar sheet and the positive electrode sheet in series; A first positive electrode layer is provided on one side of the bipolar sheet close to the negative electrode sheet in the thickness direction, and the first positive electrode layer is suitable for connecting the bipolar sheet and the negative electrode sheet in series; The bipolar sheet is suitable for being wound together with the positive electrode sheet and the negative electrode sheet to form an internally series connected electrode group monomer.

2. The battery roll core structure according to claim 1, characterized in that: The battery core structure further includes: A first separator is disposed between the first negative electrode layer and the positive electrode sheet, wherein one side of the first separator in the thickness direction is suitable for being bonded to the first negative electrode layer, and the other side is suitable for being bonded to the positive electrode sheet; The second separator is disposed between the first positive electrode layer and the negative electrode sheet. One side of the second separator in the thickness direction is suitable for being bonded to the first positive electrode layer, and the other side is suitable for being bonded to the negative electrode sheet.

3. The battery roll core structure according to claim 2, characterized in that: The battery core structure further includes a third diaphragm, which is attached to a side of the negative electrode sheet away from the positive electrode sheet in the thickness direction, and the third diaphragm is suitable for covering the negative electrode sheet during the winding process; The third separator is suitable for being wound together with the first separator, the second separator, the bipolar sheet, the positive electrode sheet and the negative electrode sheet to form an internally connected electrode group monomer.

4. The battery roll core structure according to claim 1, characterized in that: The bipolar sheet further includes a first current collector, wherein a side of the first current collector close to the positive electrode sheet along the thickness direction is suitable for coating the first negative electrode layer, and a side of the first current collector close to the negative electrode sheet along the thickness direction is suitable for coating the first positive electrode layer.

5. The battery roll core structure according to claim 1, characterized in that: The positive electrode sheet comprises a second positive electrode layer and a second current collector, and both sides of the second current collector in a thickness direction are suitable for coating the second positive electrode layer.

6. The battery roll core structure according to claim 5, characterized in that: The battery core structure also includes a positive electrode connecting sheet; A first connection portion is provided on one side of the second current collector in the width direction. The first connection portion is formed by extending from the edge of the second current collector along the width direction away from the second current collector. The first connection portion is suitable for being welded or integrally formed with the positive electrode connecting sheet.

7. The battery roll core structure according to claim 1, characterized in that: The negative electrode sheet includes a second negative electrode layer and a third current collector, and both sides of the third current collector in a thickness direction are suitable for coating the second negative electrode layer.

8. The battery roll core structure according to claim 7, characterized in that: The battery core structure also includes a negative electrode connecting sheet; A second connection portion is provided on one side of the third current collector in the width direction. The second connection portion is formed by extending from the edge of the third current collector along the width direction away from the third current collector. The second connection portion is suitable for being welded or integrally formed with the negative electrode connecting sheet.

9. The battery roll core structure according to any one of claims 1 to 8, characterized in that: The first positive electrode layer includes a lithiated positive electrode material, and the lithiated positive electrode material includes lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel manganese oxide and lithium-rich manganese matrix; The first negative electrode layer includes a negative electrode active material, and the negative electrode active material includes graphite and lithium titanate.

10. A battery, characterized in that: include: A battery body, and a battery roll core structure as claimed in any one of claims 1 to 9.

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