Multi-tab battery roll core and battery

Abstract

The utility model discloses a multi-tab battery roll core and a battery, the multi-tab battery roll core comprises a first pole piece, a second pole piece and isolating membranes, and the isolating membranes are attached to the two surfaces of the first pole piece and the second pole piece; the first pole piece, the second pole piece and the isolating membrane which are arranged in a stacked mode are wound to form a plurality of first winding core parts and second winding core parts which are alternately arranged, the sizes of the first winding core parts and the second winding core parts which are sequentially arranged from inside to outside are gradually increased, and each first winding core part is provided with a first tab part towards one side. A second tab part is arranged on the other side of each second roll core part, a plurality of adjacent first tab parts are sequentially stacked to form at least two first tabs. According to the multi-tab battery roll core, the conductive performance of the battery core can be maintained, the weight, the height and the occupied space of the roll core are reduced, electrolyte can permeate conveniently, and the performance, the service life and the energy density of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a multi-electrode battery winding core, in particular to a multi-electrode battery winding core and a battery. Background Art

[0002] In the technical field of battery manufacturing, cylindrical battery cells are a common battery structure, and their manufacturing steps include battery cell winding and electrolyte infiltration. Battery cell winding refers to winding the positive and negative electrodes and the separator together in a certain way to form the core part of the battery cell, while electrolyte infiltration is the process of combining the electrolyte with the positive and negative electrodes. It is a key step in the battery manufacturing process and directly affects the performance and life of the battery. In addition, in the battery manufacturing process, laser processing technology can be used to cut the electrode sheets before the battery cell is wound, and then the battery cell is formed through battery cell winding technology.

[0003] The existing tabs of cylindrical battery cells usually use the full-tab flattening technology to blend the tabs of the core, and then inject the electrolyte into the battery cell to facilitate the penetration of the electrolyte. However, such a structure also has some problems: all the tabs are blended together, which will result in the electrolyte not being able to fully penetrate, thereby affecting the performance and life of the battery; and it will increase the overall height of the battery cell, which is not conducive to improving the energy density of the battery cell; although the full-tab flattening technology can increase the number of tabs to improve the conductivity of the battery cell, only some of the tabs in the core with a full-tab structure play a guiding role, and most of the other tabs do not play a guiding role, which will cause the internal space of the battery cell to be occupied and also increase the weight of the core. Utility Model Content

[0004] The utility model aims to provide a multi-electrode battery roll core and a battery, which can maintain the conductive performance of the battery core while reducing the weight, height and occupied space of the roll core, facilitating the infiltration of electrolyte, and is beneficial to improving the performance, life and energy density of the battery.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses a multi-electrode ear battery roll core, which includes: a first pole piece, a second pole piece and an isolation film, the isolation film is laminated on both sides of the first pole piece and the second pole piece, the stacked first pole piece, the second pole piece and the isolation film are wound to form a plurality of alternatingly arranged first roll core parts and second roll core parts, the sizes of the first roll core parts and the second roll core parts arranged in sequence from the inside to the outside gradually increase, each of the first roll core parts is provided with a first pole ear part toward one side, and each of the second roll core parts is provided with a second pole ear part toward the other side, and the adjacent plurality of the first pole ear parts are stacked in sequence to form a first pole ear, and at least two first pole ears are formed.

[0006] Optionally, a bending length of each of the first pole lug portions is less than or equal to one half of a bending length of a corresponding first winding core portion.

[0007] Optionally, two first pole ears are formed, one of which has a fan-shaped cross section, and the other of which has a curved racetrack-shaped cross section, and the two first pole ears are arranged opposite to each other.

[0008] Optionally, the first pole sheet is a positive pole sheet, comprising a positive electrode coating area and a positive electrode foil area, the positive electrode coating area forms a plurality of first winding core portions after the first pole sheet is wound, and the positive electrode foil area forms a plurality of first pole ear portions corresponding to the plurality of first winding core portions.

[0009] Optionally, a plurality of adjacent second pole lug portions are stacked in sequence to form a second pole lug, and at least two second pole lugs are formed.

[0010] Optionally, a bending length of each of the second pole lug portions is less than or equal to one half of a bending length of a corresponding second winding core portion.

[0011] Optionally, two second pole ears are formed, one of which has a fan-shaped cross section, and the other of which has a curved racetrack-shaped cross section, and the two second pole ears are arranged opposite to each other.

[0012] Optionally, the second pole sheet is a negative pole sheet, comprising a negative electrode coating area and a negative electrode foil area, the negative electrode coating area forms a plurality of second winding core portions after the second pole sheet is wound, and the negative electrode foil area forms a plurality of second pole ear portions corresponding to the plurality of second winding core portions.

[0013] Optionally, each of the first pole lug portions is provided with a first positioning hole, and each of the second pole lug portions is provided with a second positioning hole.

[0014] In order to achieve the above object, the utility model discloses a battery, which comprises:

[0015] A housing, wherein the housing is provided with a positive electrode connector, a negative electrode connector and a cover plate;

[0016] As in the aforementioned multi-tab battery roll core, the multi-tab battery roll core is arranged in the shell, and the two ends of the multi-tab battery roll core are respectively connected to the positive electrode connector and the negative electrode connector.

[0017] The utility model includes a first pole piece, a separation membrane and a second pole piece which are arranged in sequence. The stacked first pole piece, the second pole piece and the separation membrane are wound to form a plurality of alternately arranged first winding core portions and second winding core portions. Each first winding core portion and each second winding core portion are correspondingly provided with a first pole ear portion and a second pole ear portion. A plurality of adjacent first pole ear portions form a first pole ear. At least two first pole ears are formed. Each first winding core portion is provided with a first pole ear. The arrangement of the first pole ear can maintain the conductive performance of the battery cell while reducing the weight, height and occupied space of the winding core. The arrangement of the exposed portion of the first winding core portion facilitates the penetration of the electrolyte, which is beneficial to improving the performance, life and energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of a multi-tab battery roll core according to an embodiment of the utility model.

[0019] Figure 2 1. A top view of a multi-tab battery roll core according to an embodiment of the present utility model.

[0020] Figure 3 It is a three-dimensional structural diagram of the first pole piece in the multi-tab battery roll core according to an embodiment of the utility model.

[0021] Figure 4 It is a three-dimensional structural diagram of the second pole piece in the multi-tab battery roll core according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0023] See also Figures 1 to 4 The utility model discloses a multi-electrode lug battery winding core, which includes: a first pole piece 1, a second pole piece 2 and a separator 3. The separator 3 is laminated on both sides of the first pole piece 1 and the second pole piece 2. The stacked first pole piece 1, the second pole piece 2 and the separator 3 are wound to form a plurality of alternately arranged first winding core parts 11 and second winding core parts 21. The sizes of the first winding core parts 11 and the second winding core parts 21 arranged sequentially from the inside to the outside gradually increase. Each first winding core part 11 is provided with a first pole lug part 12 on one side, and each second winding core part 21 is provided with a second pole lug part 22 on the other side. Multiple adjacent first pole lug parts 12 are stacked in sequence to form a first pole lug 110, and at least two first pole lugs 110 are formed.

[0024] The utility model includes a first pole piece 1, a separation film 3 and a second pole piece 2 which are arranged in sequence. The stacked first pole piece 1, the second pole piece 2 and the separation film 3 are wound to form a plurality of alternately arranged first winding core portions 11 and second winding core portions 21. Each first winding core portion 11 and each second winding core portion 21 are correspondingly provided with a first pole ear portion 12 and a second pole ear portion 22. The adjacent plurality of first pole ear portions 12 form a first pole ear 110. At least two first pole ears 110 are formed. The arrangement of each first winding core portion 11 being provided with a first pole ear 110 can maintain the conductive performance of the battery cell while reducing the weight, height and occupied space of the winding core. The arrangement of the exposed portion of the first winding core portion 11 facilitates the penetration of electrolyte, which is beneficial to improving the performance, life and energy density of the battery.

[0025] See also Figures 1 to 3 The first pole sheet 1 is a positive pole sheet, and the first pole sheet 1 includes a positive electrode coating area 13 and a positive electrode foil area 14. The positive electrode coating area 13 is formed with a plurality of first winding cores 11 after the first pole sheet 1 is wound, and the positive electrode foil area 14 is formed with a plurality of first pole ear portions 12 corresponding to the plurality of first winding cores 11.

[0026] Specifically, in this embodiment, Figure 3 As shown, the first pole sheet 1 is provided with a plurality of side-by-side first partitions 15 before winding, and the lateral dimension Xn of each first partition 15 is set according to the circumference of each first winding core portion 11 formed after winding, and gradually increases from left to right, and a first pole ear sheet 16 with a lateral dimension smaller than the lateral dimension of the first partition 15 is provided on the upper side of each first partition 15, which forms the first pole ear portion 12 of the first winding core portion 11. Therefore, each first partition 15 is reserved with a first pole ear sheet 16, so that each first winding core portion 11 formed after winding is provided with a first pole ear portion 12. These first pole ear portions 12 can effectively play a role in guiding current, which is beneficial to improving the energy density of the battery cell while maintaining the stability of the internal resistance of the battery cell.

[0027] Optionally, the bending length of each first pole lug portion 12 is less than or equal to one half of the bending length of the corresponding first winding core portion 11 .

[0028] Specifically, in the present embodiment, compared with the traditional full-tab battery cell, the present embodiment cuts off at least half of the tab volume through the cylindrical multi-tab laser die-cutting and winding technology, so that each first winding core 11 has a large number of tab-free areas, which effectively improves the penetration of the electrolyte and avoids the problem of the electrolyte being difficult to fully penetrate due to all the tabs being mixed together, thereby effectively improving the performance and life of the battery cell with such a structure.

[0029] Optionally, two first pole tabs 110 are formed, one first pole tab 110 has a fan-shaped cross section, and the other first pole tab 110 has a curved track-shaped cross section, and the two first pole tabs 110 are arranged opposite to each other.

[0030] Specifically, in this embodiment, through the laser die-cutting technology, the first pole tabs 16 of the first partitions 15 of the left half of the first pole piece 1 are correspondingly reserved on the upper side of the left half of the first partition 15, and through the winding technology, the first pole tabs 16 of the first partitions 15 of the left half of the first pole piece 1 are stacked to form a first pole tab 110 with a fan-shaped cross section; similarly, the first pole tabs 16 of the first partitions 15 of the right half of the first pole piece 1 are correspondingly reserved on the upper side of the right half of the first partition 15, and through the winding technology, the first pole tabs 16 of the first partitions 15 of the right half of the first pole piece 1 are stacked to form a first pole tab 110 with a curved runway-shaped cross section. Reasonably staggering and bending the two first pole tabs 110 is conducive to reducing the thickness of the pole tabs of the winding core after bending, so as to reduce the overall height of the winding core, so that the space inside the winding core can be effectively utilized, thereby improving the energy density of the winding core.

[0031] See also Figures 1 to 4 The second electrode sheet 2 is a negative electrode sheet, and the second electrode sheet 2 includes a negative electrode coating area 23 and a negative electrode foil area 24. The negative electrode coating area 23 is formed with a plurality of second winding cores 21 after the second electrode sheet 2 is wound, and the negative electrode foil area 24 is formed with a plurality of second pole ear portions 22 corresponding to the plurality of second winding cores 21.

[0032] See also Figures 1 to 4 A plurality of adjacent second pole lug portions 22 are stacked in sequence to form a second pole lug 210 , and at least two second pole lugs 210 are formed.

[0033] Optionally, the bending length of each second pole lug portion 22 is less than or equal to one half of the bending length of the corresponding second winding core portion 21 .

[0034] Specifically, in this embodiment, the second partition 25 and the second pole tab 26 formed by the second pole piece 2 have the same structure as the first partition 15 and the first pole tab 16 of the first pole piece 1 , except that they are oriented in different directions. Therefore, reference may be made to the description of the first pole piece 1 above, and no further details will be given herein.

[0035] Optionally, two second pole tabs 210 are formed, one second pole tab 210 has a fan-shaped cross section, and the other second pole tab 210 has a curved track-shaped cross section, and the two second pole tabs 210 are arranged opposite to each other.

[0036] Specifically, in the present embodiment, the second pole piece 2 is also formed with two second pole ears 210 after winding, and the two second pole ears 210 and the two first pole ears 110 are respectively arranged on the upper end face and the lower end face of the winding core, and are axially symmetrical, but not limited to this. In some embodiments, the second pole ear 210 with a fan-shaped cross-section arranged on the lower end face of the winding core and the first pole ear 110 with a fan-shaped cross-section arranged on the upper end face of the winding core are respectively arranged on two opposite sides in the horizontal direction, and the second pole ear 210 with a curved runway-shaped cross-section arranged on the lower end face of the winding core and the first pole ear 110 with a curved runway-shaped cross-section arranged on the upper end face of the winding core are also respectively arranged on two opposite sides in the horizontal direction, that is, they are centrally symmetrical, but not limited to this.

[0037] See also Figures 1 to 4 Each first pole lug portion 12 is provided with a first positioning hole 17 , and each second pole lug portion 22 is provided with a second positioning hole 27 .

[0038] Specifically, in the present embodiment, before the positive electrode foil area 14 of the first electrode sheet 1 and the negative electrode foil area 24 of the second electrode sheet 2 are die-cut, holes are first punched in the positive electrode foil area 14 and the negative electrode foil area 24 according to the positions of each first electrode ear portion 12 and each second electrode ear portion 22, and then a plurality of first electrode ear sheets 16 and second electrode ear sheets 26 are die-cut according to the first positioning holes 17 and the second positioning holes 27 using laser die-cutting technology, which is beneficial to improving the accuracy of the die-cutting positions and shapes of the first electrode ear sheets 16 and the second electrode ear sheets 26, and the first positioning holes 17 and the second positioning holes 27 can also be used for riveting with the corresponding positive electrode collector plate and the negative electrode collector plate, but are not limited thereto.

[0039] See also Figures 1 to 4 The utility model discloses a battery, which comprises:

[0040] A shell body, wherein the shell body is provided with a positive electrode connector, a negative electrode connector and a cover plate;

[0041] As in the aforementioned multi-electrode battery roll core, the multi-electrode battery roll core is disposed in a shell, and two ends of the multi-electrode battery roll core are respectively connected to a positive electrode connector and a negative electrode connector.

[0042] Specifically, in the present embodiment, the positive electrode connector includes a positive electrode current collecting disk, and the negative electrode connector includes a negative electrode current collecting disk, but the present invention is not limited thereto.

[0043] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A multi-tab battery roll core, characterized in that: include: The first pole piece, the second pole piece and the isolation film, The isolation film is bonded to both sides of the first pole piece and the second pole piece. The stacked first pole piece, the second pole piece and the isolation film are wound to form a plurality of alternatingly arranged first winding core portions and second winding core portions. The sizes of the first winding core portions and the second winding core portions arranged sequentially from the inside to the outside gradually increase. Each of the first winding core portions is provided with a first pole ear portion on one side, and each of the second winding core portions is provided with a second pole ear portion on the other side. The adjacent plurality of the first pole ear portions are stacked in sequence to form a first pole ear, and at least two of the first pole ears are formed.

2. The multi-tab battery roll core according to claim 1, characterized in that: The bending length of each of the first pole lug portions is less than or equal to one half of the bending length of the corresponding first winding core portion.

3. The multi-tab battery roll core according to claim 1, characterized in that: The first pole lugs are formed with two, one of which has a fan-shaped cross section, and the other of which has a curved racetrack-shaped cross section, and the two first pole lugs are arranged opposite to each other.

4. The multi-tab battery roll core according to claim 1, characterized in that: The first pole sheet is a positive pole sheet, comprising a positive electrode coating area and a positive electrode foil area. The positive electrode coating area forms a plurality of first winding cores after the first pole sheet is wound, and the positive electrode foil area forms a plurality of first pole ear portions corresponding to the plurality of first winding cores.

5. The multi-tab battery roll core according to claim 1, characterized in that: A plurality of adjacent second pole lug portions are stacked in sequence to form a second pole lug, and at least two second pole lugs are formed.

6. The multi-tab battery roll core according to claim 5, characterized in that: The bending length of each of the second pole lug portions is less than or equal to one half of the bending length of the corresponding second winding core portion.

7. The multi-tab battery roll core according to claim 5, characterized in that: Two second pole tabs are formed, one of which has a fan-shaped cross section, and the other of which has a curved track-shaped cross section. The two second pole tabs are arranged opposite to each other.

8. The multi-tab battery roll core according to claim 1, characterized in that: The second pole sheet is a negative pole sheet, and the second pole sheet includes a negative electrode coating area and a negative electrode foil area. The negative electrode coating area forms a plurality of second winding core portions after the second pole sheet is wound, and the negative electrode foil area forms a plurality of second pole ear portions corresponding to the plurality of second winding core portions.

9. The multi-tab battery roll core according to claim 1, characterized in that: Each of the first pole lugs is provided with a first positioning hole, and each of the second pole lugs is provided with a second positioning hole.

10. A battery, characterized in that: include: A housing, wherein the housing is provided with a positive electrode connector, a negative electrode connector and a cover plate; The multi-tab battery core according to any one of claims 1 to 9, wherein the multi-tab battery core is arranged in the shell, and the two ends of the multi-tab battery core are respectively connected to the positive electrode connector and the negative electrode connector.

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