Battery pole piece structure, battery roll core and battery

Abstract

The utility model provides a battery pole piece structure, battery roll core and battery, including foil, insulating spacer and current collecting subassembly, foil includes coating area and the empty foil area that extends along the width direction of coating area, empty foil area forms a plurality of tabs through cutting, the insulating spacer is equipped with a plurality of openings that correspond to a plurality of tabs respectively, the current collecting subassembly is equipped with a plurality of current collecting subassembly, the current collecting subassembly is equipped with a plurality of current collecting subassembly. The current collecting assembly is arranged on one surface, far away from the foil, of the insulating spacer; and the plurality of tabs respectively penetrate through the corresponding openings to be connected with the current collecting assembly. According to the battery pole piece structure, the problem that the internal space of the battery is wasted by the tabs can be relieved, and the specific capacity and the rate capability of the battery are improved.

Description

Technical Field

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

[0002] Lithium-ion batteries refer to the general term for batteries that use lithium-ion embedded compounds as positive electrode materials. They have the characteristics of high energy density, high average output voltage, low self-discharge, no memory effect, excellent cycle performance, and fast charge and discharge. They are called green batteries.

[0003] Lithium-ion batteries generally consist of a shell, a battery core and an electrolyte housed in the shell. Lithium-ion batteries of related technologies usually use ultrasonic welding to weld the tabs in the length direction perpendicular to the pole pieces, and then wind the tabs and pole pieces together to form a battery core. Since the tabs are thicker than the pole pieces, the diameter of the core at the tab position is larger, wasting internal space of the battery. Utility Model Content

[0004] The embodiments of the present utility model provide a battery pole piece structure, a battery coil and a battery, which can alleviate the problem of pole tabs wasting internal space of the battery and improve the battery specific capacity and battery rate performance.

[0005] In a first aspect, an embodiment of the present invention provides a battery electrode structure, comprising:

[0006] A foil material, comprising a coating area and a hollow foil area extending along the width direction of the coating area, wherein the hollow foil area is formed into a plurality of tabs by cutting;

[0007] an insulating gasket, wherein the insulating gasket is provided with a plurality of openings corresponding to the plurality of tabs respectively;

[0008] A current collecting assembly is provided on a side of the insulating gasket away from the foil material, and a plurality of the tabs are respectively connected to the current collecting assembly through the corresponding openings.

[0009] In one embodiment, the current collecting assembly includes N current collecting bars, wherein N=M / 2, M represents the number of the tabs, and M is an even number.

[0010] In one embodiment, one end of the collector bar is welded to one of the plurality of tabs, and the other end of the collector bar is welded to another of the plurality of tabs.

[0011] In one embodiment, when there are multiple current collecting bars, the current collecting assembly further includes a connecting portion, the multiple current collecting bars are cross-connected, and both ends of the multiple current collecting bars are connected to each other through the connecting portion.

[0012] In one embodiment, the plurality of openings are arranged in a circular pattern on the insulating gasket, and the plurality of openings are symmetrically arranged along a horizontal axis and / or a vertical axis of the insulating gasket.

[0013] In one embodiment, the plurality of tabs are spaced apart along the length direction of the coating area.

[0014] In one embodiment, the width of the empty foil area is 2-10 mm.

[0015] In one embodiment, the foil is copper foil or aluminum foil, and the coating area is provided with an active material layer.

[0016] In a second aspect, an embodiment of the present invention provides a battery roll core, comprising the battery pole piece structure described in any one of the first aspects.

[0017] In a third aspect, an embodiment of the present invention provides a battery, comprising the battery roll core described in the second aspect.

[0018] Beneficial effects of the embodiments of the present utility model:

[0019] In an embodiment of the present invention, pole ears are formed by cutting an empty foil area extending along the width direction of the coating area, and multiple pole ears are respectively connected to the current collecting assembly through corresponding openings. The multiple pole ears can be fixed on the side of the insulating gasket away from the foil material, so that the pole ears will not affect the diameter of the battery core, thereby solving the problem of waste of internal battery space caused by the larger diameter of the core at the pole ear position, and improving the battery specific capacity; the pole ears are formed by cutting the empty foil area of ​​the foil material, which can solve the problem of waste of internal battery space caused by welding occupying the active material position, and further improve the battery specific capacity; multiple pole ears are formed by cutting the empty foil area, so that current can enter the battery through multiple pole ears respectively, or be output from the battery, thereby enhancing the fast charging performance of the battery and improving the battery rate performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic structural diagram of a battery electrode structure provided by an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the foil material before the empty foil area is cut, provided by an embodiment of the present utility model;

[0023] Figure 3 This is a structural diagram of a tab connected to a current collecting assembly through an opening provided by an embodiment of the present invention;

[0024] Figure 4 This is a structural diagram of another embodiment of the present invention in which a tab is connected to a current collecting assembly through an opening;

[0025] Figure 5 It is a structural schematic diagram of an insulating gasket provided in an embodiment of the utility model.

[0026] The following are the descriptions of the reference numerals:

[0027] 10. Coating area; 20. Empty foil area; 30. Tab; 40. Insulating gasket; 50. Current collecting assembly; 60. Active material layer; 70. Solder joint; 41. Opening; 51. Current collecting bar; 52. Connecting part. DETAILED DESCRIPTION

[0028] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0029] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] In the present invention, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is at a lower level than the second feature. In the description of this embodiment, the terms "above," "below," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are intended only to facilitate description and simplify operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0031] After research, the inventors found that lithium-ion batteries in related technologies usually use ultrasonic welding to weld the tabs in the length direction perpendicular to the pole pieces, and then wind the tabs and the pole pieces together to form a battery core. This lithium-ion battery has at least the following problems: ① Since the tabs are thicker than the pole pieces, the diameter of the core at the tab position is larger, and the battery core is elliptical, which wastes the internal space of the battery; ② The tabs are welded to the pole pieces by ultrasonic welding, and the welding of the tabs to the pole pieces requires occupying a certain active material position, which wastes the internal space of the battery.

[0032] In order to solve the above problems, Figures 1 to 5 As shown, this embodiment provides a battery electrode structure, which includes: a foil, an insulating spacer 40, and a current collecting assembly 50. The foil includes a coated area 10 and a hollow foil area 20 extending along the width direction of the coated area 10. The hollow foil area 20 is cut to form a plurality of tabs 30. The insulating spacer 40 is provided with a plurality of openings 41 corresponding to the plurality of tabs 30. The current collecting assembly 50 is provided on a side of the insulating spacer 40 away from the foil. The plurality of tabs 30 are connected to the current collecting assembly 50 through the corresponding openings 41.

[0033] The battery electrode structure provided in this embodiment can be applied to the positive electrode of the battery or the negative electrode of the battery. When the battery electrode structure is applied to the positive electrode of the battery, the multiple pole ears 30 formed by cutting the empty foil area 20 extending along the width direction of the coating area 10 are the positive pole ears. When the battery electrode structure is applied to the negative electrode of the battery, the multiple pole ears 30 formed by cutting the empty foil area 20 extending along the width direction of the coating area 10 are the negative pole ears. The multiple pole ears 30 are respectively connected to the current collecting assembly 50 through the corresponding openings 41, so that the multiple pole ears 30 are fixed on the side of the insulating gasket 40 away from the foil material. The pole ears 30 will not affect the diameter of the battery roll core, thereby solving the problem of waste of internal space of the battery caused by the larger diameter of the roll core at the pole ear position, thereby improving the battery specific capacity.

[0034] In addition, the tabs 30 are formed by cutting the empty foil area 20 of the foil material, which can solve the problem of waste of internal space of the battery caused by the need to occupy the position of the active material for welding, and further improve the battery specific capacity; in addition, multiple tabs 30 are formed by cutting the empty foil area 20, so that current can enter the battery through the multiple tabs 30 respectively, or be output from the battery, thereby enhancing the fast charging performance of the battery and improving the battery rate performance.

[0035] In some embodiments, reference Figures 3 to 5 As shown, the multiple openings 41 provided on the insulating gasket 40 are through holes extending from the side of the insulating gasket 40 close to the foil to the side away from the foil. The cross-sectional area of ​​the multiple openings 41 is larger than the cross-sectional area of ​​the corresponding pole tabs 30. Such a configuration allows the multiple pole tabs 30 to pass through the corresponding openings 41 and enables the multiple pole tabs 30 to be connected to the current collecting assembly 50.

[0036] In some embodiments, the foil material may be copper foil or aluminum foil. For example, when the battery electrode structure is applied to the positive electrode of a battery, the foil material is aluminum foil; when the battery electrode structure is applied to the negative electrode of a battery, the foil material is copper foil. Of course, in other embodiments, the foil material may also be other metal foils, such as stainless steel with a surface plated with carbon, nickel, titanium, or silver, or aluminum-cadmium alloy with a surface plated with carbon, nickel, titanium, or silver.

[0037] It should be noted that, since the multiple tabs 30 in this embodiment are obtained by cutting the empty foil area of ​​the foil, the material of the multiple tabs 30 is the same as the material of the foil, that is, the material of the multiple tabs 30 includes but is not limited to aluminum, copper, stainless steel with carbon, nickel, titanium or silver plated on the surface, aluminum-cadmium alloy with carbon, nickel, titanium or silver plated on the surface, etc.

[0038] In some embodiments, the current collecting assembly 50 can be made of a conductive metal material. For example, when the battery pole piece structure is applied to the positive pole piece of the battery, the material of the current collecting assembly 50 is aluminum or other metals; when the battery pole piece structure is applied to the negative pole piece of the battery, the material of the current collecting assembly 50 is copper-nickel composite material, copper-plated material, pure nickel material or other metal materials.

[0039] In some embodiments, reference Figure 2 As shown, the foil includes a coated area 10 and a blank foil area 20. The coated area 10 is the area coated with active material, and the blank foil area 20 is a blank area not coated with active material. The blank foil area 20 extends along the width direction of the coated area 10. The width direction of the coated area 10 refers to the short side direction of the coated area 10. For example, when the coated area 10 is a rectangular structure, the width direction of the coated area 10 refers to the width direction of the rectangle, that is, Figure 2 The Y-axis direction is shown.

[0040] In some embodiments, continue to refer to Figure 2 As shown, the coating area 10 and the empty foil area 20 are both rectangular structures. The length of the coating area 10 is equal to the length of the empty foil area 20, and the width of the coating area 10 is greater than the width of the empty foil area 20. This arrangement can reserve enough area for the foil to be coated with active material.

[0041] In some embodiments, the width of the empty foil area 20 is 2 to 10 mm. For example, the width of the empty foil area 20 is 2 mm, 5 mm, 8 mm, 10 mm, etc. This can prevent the width of the empty foil area 20 from being set too small, resulting in the formed pole ear 30 being too short to be connected to the current collecting assembly 50, and can also prevent the width of the empty foil area 20 from being set too large, resulting in waste of foil.

[0042] It should be noted that the width of the empty foil area 20 refers to the vertical distance from one end of the empty foil area 20 close to the coating area 10 to the other end away from the coating area 10. For example, if the empty foil area 20 is a rectangular structure, the width of the empty foil area 20 refers to the width of the rectangle, that is, Figure 2 The distance of the empty foil area 20 in the Y-axis direction is shown.

[0043] In some embodiments, continue to refer to Figure 1 and Figure 2 As shown, the coating area 10 forms an active material layer 60 by coating the active material. The coating area 10 includes two surfaces arranged opposite to each other. The active material is coated on the two surfaces of the coating area 10 and / or one of the two surfaces of the coating area 10. The active material can be coated on the entire surface of the coating area 10 or on a partial area of ​​one surface of the coating area 10.

[0044] Furthermore, the type and ratio of active materials in active material layer 60 can be set according to actual needs and are not further limited here. For example, when the battery electrode structure is applied to the negative electrode of a battery, the active material in active material layer 60 may include materials such as graphite, hard carbon, silicon, and silicon dioxide; when the battery electrode structure is applied to the positive electrode of a battery, the active material in active material layer 60 may include materials such as lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide.

[0045] In some embodiments, continue to refer to Figure 1 As shown, the number of the plurality of tabs 30 formed by cutting the empty foil area 20 is an even number, for example, the number of the plurality of tabs 30 is 2, 4, 6, 8, 10, etc. The plurality of tabs 30 are arranged at intervals along the length direction of the coating area 10. The length direction of the coating area 10 refers to the long side direction of the coating area 10. For example, if the coating area 10 is a rectangular structure, the length direction of the coating area 10 refers to the length direction of the rectangle, that is, Figure 1 and Figure 2 The X-axis direction is shown.

[0046] It should be noted that the spacing between the multiple tabs 30 when arranged along the length direction of the coating area 10 can be the same or different, for example, Figure 1 Among the four tabs shown, the distance between the two middle tabs is greater than the distance between the two adjacent tabs.

[0047] In some embodiments, reference Figure 3 and Figure 4 As shown, the current collecting assembly 50 includes N collecting bars 51. The number of collecting bars 51 and the number of tabs 30 satisfy the relationship: N = M / 2, where M represents the number of tabs 30 and is an even number. For example, when the number of tabs 30 is 2, the number of collecting bars 51 is 1; when the number of tabs 30 is 4, the number of collecting bars 51 is 2; and when the number of tabs 30 is 6, the number of collecting bars 51 is 3.

[0048] In some embodiments, one end of the current collecting bar 51 is welded to one of the plurality of tabs 30, and the other end of the current collecting bar 51 is welded to another of the plurality of tabs 30. Figure 3 As shown, when the number of the tabs 30 is 2, the number of the collector bar 51 is 1, and both ends of the collector bar 51 are welded to the two tabs 30 to form welding points 70; for another example, referring to Figure 4 As shown, when the number of the electrode tabs 30 is 6, the number of the current collecting bars 51 is 3, and both ends of each current collecting bar 51 are respectively welded to two electrode tabs 30 to form welding points 70.

[0049] In some embodiments, continue to refer to Figure 4As shown, when the current collecting assembly 50 includes multiple collecting bars 51, the current collecting assembly 50 also includes a connecting portion 52. The multiple collecting bars 51 are cross-connected on the insulating gasket 40, and the two ends of the multiple collecting bars 51 are connected to each other through the connecting portion 52. In this way, multiple tabs can be welded together through the multiple collecting bars. For example, referring to Figure 4 As shown, the connecting portion 52 is annular, and three collecting bars 51 are cross-connected on the insulating spacer 40 . Both ends of the three collecting bars 51 are connected to the annular connecting portion 52 .

[0050] In some embodiments, the multiple collector bars 51 and the connecting portion 52 can be formed at one time by stamping to improve production efficiency. Of course, the multiple collector bars 51 and the connecting portion 52 can also be formed separately and then welded to each other.

[0051] In some embodiments, the plurality of openings 41 are arranged in a circular pattern on the insulating spacer 40, and the plurality of openings 41 are symmetrically arranged along the horizontal axis and / or the vertical axis of the insulating spacer 40. For example, referring to Figure 3 As shown, the two openings 41 are symmetrically arranged along the vertical axis of the insulating spacer 40, referring to Figure 4 and Figure 5 As shown, the six openings 41 are symmetrically arranged along the horizontal axis and the vertical axis of the insulating spacer 40 .

[0052] Further, continue to refer to Figure 5 As shown, the insulating gasket 40 is a circular structure, the circular structure surrounded by multiple openings 41 is concentric with the circular structure of the insulating gasket 40, and the radius of the circular structure of the insulating gasket 40 is larger than the radius of the circular structure surrounded by multiple openings 41, and the current collecting assembly 50 is arranged in the circular structure surrounded by multiple openings 41.

[0053] This embodiment also provides a battery roll core, which includes a positive electrode sheet, a separator and a negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence and wound to form the battery roll core. At least one of the positive electrode sheet and the negative electrode sheet adopts the above-mentioned battery electrode sheet structure. The battery roll core provided in this embodiment forms the pole tabs 30 by cutting the empty foil area 20 extending along the width direction of the coating area 10, and the multiple pole tabs 30 are respectively connected to the current collecting assembly 50 through the corresponding openings 41. The multiple pole tabs 30 can be fixed on the side of the insulating gasket 40 away from the foil material, so that the pole tabs 30 will not affect the diameter of the battery roll core, thereby solving the problem of waste of internal battery space caused by the larger diameter of the roll core at the pole tab position, and improving the battery specific capacity; the pole tabs 30 are formed by cutting the empty foil area 20 of the foil material, which can solve the problem of waste of internal battery space caused by welding occupying the active material position, and further improve the battery specific capacity; in addition, multiple pole tabs 30 are formed by cutting the empty foil area 20, so that current can enter the battery through the multiple pole tabs 30 respectively, or be output from the battery, thereby enhancing the fast charging performance of the battery and improving the battery rate performance.

[0054] This embodiment also provides a battery, which includes the above-mentioned battery core. The battery core in the battery provided by this embodiment forms a pole ear 30 by cutting the empty foil area 20 extending along the width direction of the coating area 10, and the multiple pole ears 30 are respectively connected to the current collecting assembly 50 through the corresponding openings 41. The multiple pole ears 30 can be fixed on the side of the insulating gasket 40 away from the foil material, so that the pole ears 30 will not affect the diameter of the battery core, thereby solving the problem of waste of internal space of the battery caused by the larger diameter of the core at the pole ear position, and improving the battery specific capacity; the pole ear 30 is formed by cutting the empty foil area 20 of the foil material, which can solve the problem of waste of internal space of the battery caused by welding occupying the active material position, and further improve the battery specific capacity; in addition, multiple pole ears 30 are formed by cutting the empty foil area 20, so that current can enter the battery through the multiple pole ears 30 respectively, or be output from the battery, thereby enhancing the fast charging performance of the battery and improving the battery rate performance.

[0055] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery pole piece structure, characterized in that: include: A foil material, the foil material comprising a coating area and a hollow foil area extending along the width direction of the coating area, wherein the hollow foil area is formed into a plurality of tabs by cutting; An insulating gasket, wherein the insulating gasket is provided with a plurality of openings corresponding to the plurality of pole tabs respectively; A current collecting assembly is arranged on a side of the insulating gasket away from the foil material, and a plurality of the pole ears are respectively connected to the current collecting assembly through the corresponding openings.

2. The battery pole piece structure according to claim 1, characterized in that: The current collecting assembly includes N current collecting bars, wherein N=M / 2, M represents the number of the pole tabs, and M is an even number.

3. The battery pole piece structure according to claim 2, characterized in that: One end of the collector bar is welded to one of the plurality of pole tabs, and the other end of the collector bar is welded to another of the plurality of pole tabs.

4. The battery pole piece structure according to claim 2, characterized in that: When there are multiple current collecting bars, the current collecting assembly further includes a connecting portion, the multiple current collecting bars are cross-connected, and both ends of the multiple current collecting bars are connected to each other through the connecting portion.

5. The battery pole piece structure according to claim 1, characterized in that: The plurality of openings are arranged in a circular shape on the insulating gasket, and the plurality of openings are symmetrically arranged along a horizontal axis and / or a vertical axis of the insulating gasket.

6. The battery pole piece structure according to claim 1, characterized in that: The plurality of tabs are arranged at intervals along the length direction of the coating area.

7. The battery pole piece structure according to any one of claims 1 to 6, characterized in that: The width of the empty foil area is 2 to 10 mm.

8. The battery pole piece structure according to any one of claims 1 to 6, characterized in that: The foil material is copper foil or aluminum foil, and the coating area is provided with an active material layer.

9. A battery roll core, characterized in that: Comprising the battery pole piece structure as described in any one of claims 1 to 8.

10. A battery, characterized in that: Comprising the battery roll core as claimed in claim 9.

Images