Electrode body for lithium battery

Abstract

The utility model relates to the technical field of lithium batteries, in particular to an electrode body for a lithium battery. Comprising a current collector, slurry layers are arranged on the two sides of the current collector, a plurality of chute pairs are formed in the surfaces, combined with the two slurry layers, of the current collector, and each chute pair comprises a first chute and a second chute; one side, far away from the second chute, of the first chute is inclined towards the direction far away from the second chute from the direction close to the surface of the current collector to the direction far away from the surface of the current collector; and one side, far away from the first chute, of the second chute is inclined towards the direction far away from the first chute from the direction close to the surface of the current collector to the direction far away from the surface of the current collector. According to the utility model, the slurry leakage phenomenon is avoided, bonding materials are saved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an electrode body for a lithium battery. Background Art

[0002] Lithium batteries are currently a very commonly used type of battery, and the electrode body is an important component in a lithium battery. The patent with the application number 202022611600.5 discloses a lithium battery electrode and a lithium battery. The lithium battery electrode includes: a current collector, the current collector having a first surface and a second surface arranged opposite to each other, a plurality of first blind holes being formed in the first surface, the first blind holes being arranged in an array, a plurality of second blind holes being formed in the second surface, the second blind holes being arranged in an array; an adhesive, the adhesive being filled in the first blind holes and the second blind holes; a slurry layer, the slurry layer being respectively arranged on the first surface and the second surface. The arrangement of the first blind holes and the second blind holes in this application improves the bonding state between the current collector and the slurry layer and can prevent the adhesive from leaking onto the second surface or the first surface. The present application provides a different way to improve the bonding state between the current collector and the slurry layer. Summary of the Utility Model

[0003] The technical problem to be solved by the present utility model is to provide an electrode body for a lithium battery in view of the above-mentioned existing technical deficiencies.

[0004] To solve the above technical problem, the technical solution adopted by the present utility model is: an electrode body for a lithium battery, including a current collector, slurry layers being arranged on both sides of the current collector, a plurality of pairs of inclined grooves being arranged on the surfaces where the current collector is combined with the two slurry layers, each pair of inclined grooves including a first inclined groove and a second inclined groove, the side of the first inclined groove away from the second inclined groove being inclined in a direction away from the second inclined groove in the direction from near to far from the surface of the current collector; the side of the second inclined groove away from the first inclined groove being inclined in a direction away from the first inclined groove in the direction from near to far from the surface of the current collector.

[0005] Further optimizing the technical solution, the cross-sections of the first inclined groove and the second inclined groove are both obtuse triangles.

[0006] Further optimizing the technical solution, a fillet is arranged on an edge where the first inclined groove is recessed from the surface of the current collector, and a fillet is arranged on an edge where the second inclined groove is recessed from the surface of the current collector.

[0007] Compared with the prior art, the present utility model has the following advantages: A plurality of pairs of inclined grooves are arranged on the surfaces where the current collector is respectively combined with the two slurry layers. Each pair of inclined grooves includes a first inclined groove and a second inclined groove with opposite inclination directions. The slurry layer is filled into the first inclined groove and the second inclined groove, thereby improving the bonding state between the current collector and the slurry layer, preventing the occurrence of slurry leakage, eliminating the need for an adhesive, and reducing costs. Brief Description of the Drawings

[0008] Figure 1 It is a schematic structural view of an electrode body for a lithium battery.

[0009] Figure 2 It is Figure 1 an enlarged view of part Ⅰ in

[0010] Figure 3 a schematic structural view of a current collector.

[0011] In the figure: 1. Slurry layer; 2. Current collector; 21. First inclined groove; 211. Rounded corner; 22. Second inclined groove. Detailed Description of the Preferred Embodiments

[0012] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present invention.

[0013] Detailed Description of the Preferred Embodiments: As shown in Figures 1-3 , an electrode body for a lithium battery includes a current collector 2. When it is used as a positive electrode, the material of the current collector 2 is aluminum, and when it is used as a negative electrode, the material of the current collector 2 is copper. Slurry layers 1 are provided on both sides of the current collector 2. When it is used as a positive electrode, the slurry layer 1 includes a positive electrode active material, a solvent, a conductive agent and a binder. When it is used as a negative electrode, the slurry layer 1 includes a negative electrode active material, a solvent, a conductive agent and a binder. A plurality of pairs of inclined grooves are provided on the surfaces of the current collector 2 where it is combined with the two slurry layers 1. Each pair of inclined grooves includes a first inclined groove 21 and a second inclined groove 22. The side of the first inclined groove 21 away from the second inclined groove 22 is inclined away from the second inclined groove 22 in the direction from near to far from the surface of the current collector 2; the side of the second inclined groove 22 away from the first inclined groove 21 is inclined away from the first inclined groove 21 in the direction from near to far from the surface of the current collector 2. Since the slurry layer 1 is coated on the surface of the current collector 2, the slurry layer 1 fills into the first inclined groove 21 and the second inclined groove 22. Since the first inclined groove 21 and the second inclined groove 22 are inclined in opposite directions, the combination state of the slurry layer 1 and the current collector 2 is good, and the slurry layer 1 is not easily detached from the current collector 2.

[0014] Furthermore, the cross-sections of the first inclined groove 21 and the second inclined groove 22 are both obtuse triangles. As can be seen from Figure 2 , since the cross-sections are obtuse triangles, less slurry is required to fill the first inclined groove 21 and the second inclined groove 22.

[0015] Further, a fillet 211 is provided at a rounded corner where the first inclined groove 21 is recessed in an edge of the current collector 2 surface, and a fillet 211 is provided at a rounded corner where the second inclined groove 22 is recessed in an edge of the current collector 2 surface. The slurry can easily fill the fillets 211 of the first inclined groove 21 and the second inclined groove 22, and it is not easy to leave voids.

[0016] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrode body for a lithium battery, comprising a current collector (2), wherein slurry layers (1) are provided on both sides of the current collector (2), characterized in that: The surfaces of the current collector (2) that are bonded to the two slurry layers (1) are provided with a plurality of inclined groove pairs, the inclined groove pairs comprising a first inclined groove (21) and a second inclined groove (22), the side of the first inclined groove (21) away from the second inclined groove (22) being inclined in a direction from approaching to being away from the surface of the current collector (2) in a direction away from the second inclined groove (22); the side of the second inclined groove (22) away from the first inclined groove (21) being inclined in a direction from approaching to being away from the surface of the current collector (2) in a direction away from the first inclined groove (21).

2. The lithium battery electrode body according to claim 1, characterized in that: The cross sections of the first inclined groove (21) and the second inclined groove (22) are both obtuse triangles.

3. The lithium battery electrode body according to claim 2, characterized in that: An edge of the first oblique groove (21) recessed in the surface of the current collector (2) is provided with a rounded corner (211), and an edge of the second oblique groove (22) recessed in the surface of the current collector (2) is provided with a rounded corner (211).

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