Battery pole piece and battery

Abstract

The utility model provides a battery pole piece and a battery, the battery pole piece comprises a lithium strip and a reinforcing structure, the reinforcing structure comprises a plurality of metal wires, the plurality of metal wires are at least partially embedded in the lithium strip, the plurality of metal wires are arranged at intervals along the width direction of the lithium strip, and the plurality of metal wires are arranged at intervals along the thickness direction of the lithium strip. The ratio of the width of the metal wire to the thickness of the lithium strip is (1-10): 10, and the ratio of the length of the metal wire to the length of the lithium strip is (7-10): 10. The probability of burrs of the metal wires is reduced, the short circuit risk caused by the burrs is reduced, the lithium strip can be completely subjected to discharge reaction, the discharge capacity and capacity consistency of the battery are improved, the reinforcing structure is not prone to breakage, electric connection is kept, and islanding lithium is avoided.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery electrode and a battery. Background Art

[0002] Lithium batteries have the advantages of high energy density, long service life, and green and pollution-free, and are widely used in consumer electronics and electric vehicles. One of the important directions of lithium battery technology development is to improve the energy density of lithium batteries. To this end, many lithium batteries use lithium strips (or lithium foils) made of metallic lithium as the negative electrode of lithium batteries. As the negative electrode material of lithium metal batteries, lithium strips will be consumed during the discharge process. Therefore, in the related technology, adhesive tape or copper foil is usually attached to the lithium strip to prevent problems such as breakage. However, the current collection scheme of the related technology will still have problems such as breakage or burrs in the later stage of discharge. Utility Model Content

[0003] In view of this, the present application provides a battery pole piece and a battery, which can reduce the breakage of the battery pole piece and the generation of metal wire burrs, reduce the risk of battery short circuit caused by the burrs, and improve battery performance.

[0004] To solve the above problems, the technical solutions provided by this application are as follows:

[0005] In a first aspect, the present application provides a battery electrode, comprising:

[0006] A lithium strip and a reinforcement structure, wherein the reinforcement structure comprises a plurality of metal wires, wherein the plurality of metal wires are at least partially embedded in the lithium strip, wherein the plurality of metal wires are spaced apart along the width direction of the lithium strip, and along the thickness direction of the lithium strip, the ratio between the thickness of the metal wires and the thickness of the lithium strip is (1-10):10, and the ratio between the length of the metal wires and the length of the lithium strip is (7-10):10.

[0007] In an optional embodiment of the present application, the interval between adjacent metal wires is 5mm-15mm.

[0008] In an optional embodiment of the present application, the metal wire is arranged in a straight line or a curve along the length direction of the lithium strip.

[0009] In an optional embodiment of the present application, the width of the lithium strip is 30 mm-100 mm;

[0010] And / or the thickness of the lithium strip is 50um-200um.

[0011] In an optional embodiment of the present application, the ratio of the length of the metal wire to the length of the lithium strip is (7-9):10.

[0012] In an optional embodiment of the present application, the ratio of the length of the metal wire to the length of the lithium strip is 1:1.

[0013] In an optional embodiment of the present application, the cross-section of the metal wire along the length direction is circular or quadrilateral.

[0014] In an optional embodiment of the present application, the thickness of the metal wire is 20 μm-200 μm.

[0015] In an optional embodiment of the present application, the metal wire is a copper wire, a nickel wire or an aluminum wire.

[0016] In a second aspect, the present application provides a battery, comprising:

[0017] The above-mentioned battery electrode.

[0018] The battery pole piece provided by the present application includes at least the following beneficial effects: a lithium strip and a reinforcement structure, wherein the reinforcement structure includes a plurality of metal wires, wherein the plurality of metal wires are at least partially embedded in the lithium strip, and the plurality of metal wires are arranged at intervals along the width direction of the lithium strip, and along the thickness direction of the lithium strip, the ratio between the thickness of the metal wire and the thickness of the lithium strip is (1-10):10, and the ratio between the length of the metal wire and the length of the lithium strip is (7-10):10. The probability of burrs on the metal wire is reduced, and there is even no burr, which reduces the risk of short circuit caused by burrs, and the lithium strip can fully perform discharge reaction, thereby improving the discharge capacity and capacity consistency of the battery, and the metal wire is not easy to break, so it maintains electrical connection and avoids the occurrence of isolated lithium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a battery electrode provided in one embodiment of the present application.

[0021] Figure 2A , 2B Another structural schematic diagram of a battery electrode provided in one embodiment of the present application.

[0022] Figure 3 A schematic structural diagram of a battery electrode provided in another embodiment of the present application.

[0023] Figure numerals: 100 - battery pole piece; 10 - lithium belt; 101 - receiving slot; 20 - reinforcement structure; 201 - metal wire. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] The present application may repeat reference numerals and / or reference letters in different implementations. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.

[0027] The battery electrode and battery provided in the present application will be described in detail below in combination with specific embodiments and drawings. In any embodiment of the present application, the battery electrode can be used as a negative electrode of a lithium metal battery.

[0028] See also Figure 1 The present application provides a battery electrode 100, comprising:

[0029] A lithium strip 10 and a reinforcement structure 20, wherein the reinforcement structure 20 comprises a plurality of metal wires 201, wherein the plurality of metal wires 201 are at least partially embedded in the lithium strip 10, wherein the plurality of metal wires 201 are spaced apart along a width direction Y of the lithium strip 10, and along a thickness direction Z of the lithium strip 10, a ratio between the thickness of the metal wires 201 and the thickness of the lithium strip 10 is (1-9):10, and a ratio between the length of the metal wires 201 and the length of the lithium strip 10 is (7-10):10.

[0030] Specifically, after the multiple metal wires 201 of the reinforcement structure 20 are embedded in the lithium strip 10, the thickness of the lithium strip 10 remains unchanged, for example. The existence of the reinforcement structure 20 ensures that the lithium strip 10 is still electrically connected after the discharge reaction is consumed, that is, after the discharge reaction of the lithium strip 10 is consumed, the reinforcement structure 20 is still electrically connected to the positive electrode material or other components, avoiding the existence of isolated lithium and improving the discharge capacity and capacity consistency of the battery.

[0031] Furthermore, the reinforcement structure 20 is embedded in the lithium strip 10 , which reduces the probability of burrs appearing on the edge of the reinforcement structure 20 . The reinforcement structure 20 may even be burr-free, thereby reducing the short circuit risk caused by the burrs and improving the production yield of the battery electrode 100 .

[0032] Specifically, the cross-sectional area of ​​the metal wire 201 in the length direction X is, for example, a circle, a quadrilateral or other geometric shapes, which is subject to actual application. The orthographic projection of the metal wire 201 on the lithium belt 10 is, for example, a rectangle, the width of the lithium belt 10 is, for example, 30 mm-100 mm, the thickness of the lithium belt 10 is, for example, 50 um-200 um, and the width of the metal wire 201 is, for example, 20 μm-200 μm, but is not limited thereto, which is subject to actual application.

[0033] Specifically, the lithium strip 10 may have a plurality of receiving grooves 101 along the thickness direction Z, for example. The plurality of receiving grooves 101 are arranged along the width direction Y of the lithium strip 10. The number of the receiving grooves 101 is equal to the number of the metal wires 201. The width and thickness of the receiving grooves 101 are equal to the width and thickness of the metal wires 201. For example, the width of the metal wire 201 is 20 μm-200 μm, and the width of the receiving groove 101 is also 20 μm-200 μm. The metal wire 201 is located in the receiving groove 101.

[0034] In an optional embodiment of the present application, the interval between adjacent metal wires 201 is 5 mm-15 mm, and the plurality of metal wires 201 reduces the risk of the battery electrode 100 being broken.

[0035] Specifically, the plurality of metal wires 201 are arranged relatively inclined or relatively parallel in the width direction Y of the lithium ribbon 10 , and the plurality of metal wires 201 reduce the risk of the battery electrode 100 being broken.

[0036] In an optional embodiment of the present application, the metal wire 201 is arranged in a straight line or a curve along the length direction X of the lithium strip 10, which depends on the actual application.

[0037] Preferably, the metal wire 201 is in a curve, that is, the receiving groove 101 is also in a curve. Specifically, the curve is, for example, S-shaped, or can be in a triangular broken line shape, which is subject to actual application. The metal wire 201 is in a curve, that is, the metal wire 201 has a certain elasticity. When the battery pole piece 100 expands, the metal wire 201 is not easy to break due to the elasticity, thereby ensuring the electrical connection of the battery pole piece 100 and avoiding the existence of isolated lithium.

[0038] Optionally, the metal wire 201 can also be a straight line, that is, the receiving groove 101 is also a straight line, to ensure that the lithium strip 10 is still electrically connected after the discharge reaction is consumed, that is, after the discharge reaction of the lithium strip 10 is consumed, the metal wire 201 is still electrically connected to the positive electrode material or other components to avoid the existence of isolated lithium.

[0039] In an optional embodiment of the present application, the width of the lithium strip 10 is 30 mm-100 mm;

[0040] And / or the thickness of the lithium ribbon 10 is 50um-200um, which depends on the actual application.

[0041] In an optional embodiment of the present application, the ratio of the length of the metal wire 201 to the length of the lithium strip 10 is (7-9):10.

[0042] Specifically, in the length direction X, when the metal wire 201 is arranged in a straight line or a curve, the length of the metal wire 201 is less than the length of the lithium strip 10. When cutting is required, the probability of burrs appearing on the cut of the metal wire 201 after cutting in the length direction X is reduced, or there are no burrs.

[0043] In an optional embodiment of the present application, the ratio of the length of the metal wire 201 to the length of the lithium strip 10 is 1:1. When the metal wire 201 is arranged in a straight line, the length of the metal wire 201 is equal to the length of the lithium strip 10, and the two end faces of the metal wire 201 are flush with the two end faces of the lithium strip 10, so that the metal wire 201 is easy to operate in the process, and can be directly cut in the length direction X, for example, to reduce the process difficulty. When the metal wire 201 is arranged in a curve, if the length of the metal wire 201 is equal to the length of the lithium strip 10, the two end faces of the metal wire 201 are still located in the lithium strip 10, reducing the probability of burrs appearing on the cut of the metal wire 201 after cutting in the length direction X, or no burrs.

[0044] In one embodiment, when the metal wire 201 is arranged in a curve, the length of the metal wire 201 is, for example, greater than the length of the lithium strip 10, but it is necessary to ensure that the two end surfaces of the metal wire 201 are flush with the two end surfaces of the lithium strip 10 and do not exceed the two end surfaces of the lithium strip 10, so as to ensure that the battery does not short-circuit.

[0045] In an optional embodiment of the present application, the cross-section of the metal wire 201 along the length direction X is circular or quadrilateral, but is not limited thereto.

[0046] Specifically, the thickness of the metal 201 may be equal to the thickness of the lithium strip 10 , or may be less than the thickness of the lithium strip 10 , so that the thickness of the lithium strip 10 remains unchanged after a plurality of metals 201 are embedded in the lithium strip 10 .

[0047] In an optional embodiment of the present application, the thickness of the metal wire 201 is 20 μm-200 μm, but is not limited to this thickness and is subject to actual application.

[0048] For example, when the thickness of the metal wire 201 is 50 μm, the thickness of the lithium ribbon 10 is 50 μm. When the thickness of the metal wire 201 is 200 μm, the thickness of the lithium ribbon 10 may also be 200 μm, which depends on the actual application.

[0049] In an optional embodiment of the present application, the metal wire 201 is a copper wire, a nickel wire or an aluminum wire, but is not limited thereto and is subject to actual application.

[0050] In an optional embodiment of the present application, the metal wire 201 may be composed of a plurality of current collector portions, and the plurality of current collector portions are interconnected and extend along the length direction X of the lithium ribbon 10 .

[0051] Specifically, the current collector portion is made of metal material, and multiple current collector portions are connected and extend along the length direction X of the lithium strip 10. The lithium strip 10 will not cause the battery electrode 100 to break and cause a battery short circuit due to consumption during the discharge reaction. The battery electrode 100 has the characteristics of light weight, no burrs on the upper and lower sides, and higher production yield.

[0052] In an optional embodiment of the present application, the orthographic projection of the current collector portion in the thickness direction Y of the lithium strip 10 is a circle, a quadrilateral or a triangle, which depends on the actual application.

[0053] It can be understood that the shape of the collector portion is not limited and can be circular, quadrilateral, triangular or other geometric shapes. Multiple collector portions are connected and extend in the length direction X of the lithium strip 10, so that the lithium strip 10 will not be consumed due to the discharge reaction and cause the battery electrode 100 to break, and the collector portion can still establish an electrical connection.

[0054] Embodiment 1

[0055] See also Figure 1 and Figure 2A, multiple metal wires 201 are embedded in the lithium belt 10, the receiving groove 101 extends along the length direction X of the lithium belt 10, the thickness and width of the metal wire 201 are equal to the thickness and width of the receiving groove 101, and the multiple metal wires 201 are arranged on the lithium belt 10 in a curve, the metal wire 201 is located in the receiving groove 101, the thickness of the metal wire 201 is 20μm, and the thickness of the lithium belt 10 is 100μm. The formed battery pole piece 100 has low weight, no burrs on the opposite sides, and is not easy to break, which has the effect of improving the battery discharge capacity and capacity consistency, as well as improving the battery performance.

[0056] Embodiment 2

[0057] See also Figure 2B , multiple metal wires 201 are embedded in the lithium belt 10, the receiving groove 101 extends along the length direction X of the lithium belt 10, the thickness and width of the metal wire 201 are equal to the thickness and width of the receiving groove 101, the metal wire 201 is arranged on the lithium belt 10 in a curve, multiple metal wires 201 are located in the receiving groove 101, the thickness of the metal wire 201 is 100μm, the thickness of the lithium belt 10 is 100μm, the formed battery pole piece 100 has low weight, no burrs on the opposite sides, and is not easy to break, which has the effect of improving the discharge capacity and capacity consistency of the battery, as well as improving the battery performance.

[0058] Embodiment 3

[0059] A plurality of metal wires 201 are embedded in the lithium strip 10, the receiving groove 101 extends along the length direction X of the lithium strip 10, the thickness and width of the metal wire 201 are equal to the thickness and width of the receiving groove 101, the metal wire 201 is arranged on the lithium strip 10 in a straight line, and the plurality of metal wires 201 are located in the receiving groove 101, the thickness of the metal wire 201 is 100 μm, and the thickness of the lithium strip 10 is also 100 μm. The formed battery pole piece 100 has low weight, no burrs on the opposite sides, is not easy to break, and has the effect of improving the battery discharge capacity and capacity consistency, as well as improving the battery performance.

[0060] Embodiment 4

[0061] See also Figure 3 , multiple metal wires 201 are embedded in the lithium belt 10, the receiving groove 101 extends along the length direction X of the lithium belt 10, the thickness and width of the metal wire 201 are equal to the thickness and width of the receiving groove 101, the metal wire 201 is arranged on the lithium belt 10 in a straight line, multiple metal wires 201 are located in the receiving groove 101, the thickness of the metal wire 201 is 20μm, the thickness of the lithium belt 10 is 100μm, the formed battery pole piece 100 has low weight, no burrs on the opposite sides, is not easy to break, and has the effect of improving the battery discharge capacity and capacity consistency, as well as improving the battery performance.

[0062] In a second aspect, the present application provides a battery, comprising the above-mentioned battery electrode 100.

[0063] The battery pole piece and battery provided by the present application include at least the following working process or principle: a lithium strip 10 and a reinforcement structure 20, wherein the reinforcement structure 20 includes a plurality of metal wires 201, wherein the plurality of metal wires 201 are at least partially embedded in the lithium strip 10, and the plurality of metal wires 201 are spaced apart along the width direction of the lithium strip 10, and along the thickness direction of the lithium strip, the ratio between the thickness of the metal wire 201 and the thickness of the lithium strip 10 is (1-10):10, and the ratio between the length of the metal wire 201 and the length of the lithium strip 10 is (7-10):10. The metal wire 201 is embedded in the lithium strip 10 to ensure that the lithium strip 10 remains unchanged in the thickness direction Z, so that the opposite sides of the metal wire 201 are free of burrs and are not easy to break, and ensure that the lithium strip 10 can fully perform the discharge reaction, thereby improving the discharge capacity and capacity consistency of the battery. The metal wire 201 extends in a curve, so that the metal wire 201 has a certain elasticity, which controls the weight of the battery electrode 100 and ensures that the metal wire 201 will not break after the battery expands, maintains electrical connection, and avoids the generation of isolated lithium.

[0064] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A battery pole piece, characterized in that: include: A lithium strip and a reinforcement structure, wherein the reinforcement structure comprises a plurality of metal wires, wherein the plurality of metal wires are at least partially embedded in the lithium strip, wherein the plurality of metal wires are spaced apart along the width direction of the lithium strip, and along the thickness direction of the lithium strip, the ratio between the thickness of the metal wires and the thickness of the lithium strip is (1-10):10, and the ratio between the length of the metal wires and the length of the lithium strip is (7-10):

10.

2. The battery pole piece according to claim 1, characterized in that: The interval between adjacent metal wires is 5mm-15mm.

3. The battery electrode according to any one of claims 1 or 2, characterized in that: The metal wire is arranged in a straight line or a curve along the length direction of the lithium strip.

4. The battery pole piece according to claim 1, characterized in that: The width of the lithium belt is 30mm-100mm; And / or the thickness of the lithium strip is 50um-200um.

5. The battery pole piece according to any one of claims 1, 2 or 4, characterized in that: The ratio of the length of the metal wire to the length of the lithium strip is (7-9):

10.

6. The battery pole piece according to any one of claims 1, 2 or 4, characterized in that: The ratio of the length of the metal wire to the length of the lithium strip is 1:

1.

7. The battery pole piece according to claim 1, characterized in that: The cross section of the metal wire along the length direction is circular or quadrilateral.

8. The battery pole piece according to claim 7, characterized in that: The thickness of the metal wire is 20 μm-200 μm.

9. The battery pole piece according to claim 1, characterized in that: The metal wire is a copper wire, a nickel wire or an aluminum wire.

10. A battery, characterized in that: include: A battery pole piece as claimed in any one of claims 1 to 9.

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