Battery pole piece, core package and battery

Abstract

The utility model discloses a battery pole piece, a core package and a battery, and relates to the technical field of batteries. The battery pole piece comprises a pole piece body, a plurality of first exhaust grooves and a plurality of second exhaust grooves are formed in the pole piece body, the first exhaust grooves intersect with the second exhaust grooves, and the first exhaust grooves and the second exhaust grooves both penetrate through the pole piece body.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pole piece, a core pack and a battery. Background Art

[0002] The current power and energy storage markets are increasingly demanding lithium-ion batteries with higher energy density and operational stability. High-energy-density batteries are typically made of lithium-rich or high-nickel materials, which are prone to generating gas during operation. This gas is difficult to expel, forming bubbles between the positive and negative electrodes, leading to deteriorated battery cell performance and reduced lifespan stability. Currently, negative pressure is added during market formation to extract the gas. However, this method, with its high negative pressure, can draw out the electrolyte and has certain limitations. Lithium-rich or high-nickel material systems with high gas production cannot completely extract the gas, resulting in deteriorated battery cell performance. Utility Model Content

[0003] The present application provides a battery electrode, a core pack and a battery, which can discharge the gas between the positive electrode and the negative electrode by providing an exhaust groove on the battery electrode.

[0004] In a first aspect, the present application provides a battery electrode, comprising a electrode body, on which a plurality of first exhaust grooves and a plurality of second exhaust grooves are provided, wherein the first exhaust grooves intersect with the second exhaust grooves, and both the first exhaust grooves and the second exhaust grooves pass through the electrode body.

[0005] In a possible design of the first aspect, the angle between the first exhaust groove and the length direction of the pole piece body is 30° to 60°, and the angle between the second exhaust groove and the width direction of the pole piece body is 30° to 60°.

[0006] In a possible design of the first aspect, the first exhaust groove is an arc-shaped exhaust groove, and the second exhaust groove is also an arc-shaped exhaust groove.

[0007] In a possible design manner of the first aspect, the arc corresponding to the first exhaust groove is 120° to 180°, and the arc corresponding to the second exhaust groove is 120° to 180°.

[0008] In a possible design manner of the first aspect, a radius corresponding to the first exhaust groove is 0.04 mm to 0.06 mm, and a radius corresponding to the second exhaust groove is 0.04 mm to 0.06 mm.

[0009] In a possible design manner of the first aspect, the radius corresponding to the first exhaust groove is 0.05 mm, and the radius corresponding to the second exhaust groove is 0.05 mm.

[0010] In a possible design of the first aspect, a size of the first exhaust groove is the same as a size of the second exhaust groove.

[0011] In a possible design of the first aspect, a plurality of first exhaust slots are arranged in parallel, and a plurality of second exhaust slots are arranged in parallel.

[0012] In a possible design of the first aspect, a distance between two adjacent first exhaust grooves is 0.4 mm to 0.6 mm, and a distance between two adjacent second exhaust grooves is 0.4 mm to 0.6 mm.

[0013] In the second aspect, the present application provides a core package comprising a positive electrode sheet, a negative electrode sheet and an insulating film. The positive electrode sheet is configured as a battery sheet as in the first aspect and any possible design thereof. The positive electrode sheet and the negative electrode sheet are alternately arranged, and the insulating film is arranged between the positive electrode sheet and the negative electrode sheet.

[0014] In a second aspect, the present application provides a battery, wherein the battery includes the core pack in the second aspect.

[0015] Beneficial effects of this application:

[0016] The present application provides a plurality of first exhaust grooves and a plurality of second exhaust grooves on the electrode body, and the first exhaust grooves and the second exhaust grooves are arranged crosswise. When gas is generated in the battery, the gas can be discharged through the exhaust grooves on the electrode, avoiding the formation of bubbles between the electrode pieces. In addition, since the first exhaust grooves and the second exhaust grooves are provided on the electrode piece, the first exhaust grooves and the second exhaust grooves can increase the distance between the positive and negative electrode sheets inside the bare battery cell during winding, reserve a certain amount of expansion space, and improve battery deformation. Moreover, the first exhaust grooves and the second exhaust grooves can store more electrolyte, increase the liquid retention capacity of the winding core, and enhance the performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a battery electrode provided in an embodiment of the present application;

[0019] Figure 2 A schematic cross-sectional view of a first exhaust groove in a battery electrode provided in an embodiment of the present application;

[0020] Figure 3 A schematic cross-sectional view of a second exhaust groove in a battery electrode provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a core package provided in an embodiment of the present application.

[0022] In the figure: 110 - pole piece body; 120 - first exhaust groove; 130 - second exhaust groove; 140 - positive pole piece; 150 - negative pole piece; 160 - diaphragm. DETAILED DESCRIPTION

[0023] The technical solution in this application will be described below with reference to the accompanying drawings.

[0024] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0025] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0026] It should be understood that the terms used in the description of the various examples herein are for the purpose of describing the particular examples only and are not intended to be limiting. As used in the description of the various examples, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0027] In this application, "at least one" means one, two, or more, and "more than one" means more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0028] It should also be understood that in this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a sliding connection, a detachable connection, or an integral connection, etc.; it can be a direct connection or an indirect connection through an intermediate medium.

[0029] It will also be understood that the term “comprise” (also known as “includes,” “including,” “comprises,” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0030] It should be understood that references throughout this specification to "one embodiment," "another embodiment," or "a possible design" mean that specific features, structures, or characteristics associated with an embodiment or implementation are included in at least one embodiment of this application. Therefore, the appearance of "in one embodiment of this application," "in another embodiment of this application," or "a possible design" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] It should also be understood that the specific numerical values ​​mentioned in the embodiments of this application do not limit the specific dimensions of specific features or structures. The relevant numerical values ​​may be provided for ease of explanation or may be the theoretically optimal value of a certain feature. In practice, the relevant dimensions may be within a range of the value, for example, the range may be ±10% of the optimal theoretical value, or ±20% of the optimal theoretical value. In practice, the range that achieves the corresponding technical effect shall prevail.

[0032] The vertical in the embodiments of the present application includes some situations similar to vertical, for example, the angle between lines, lines and planes, and planes is 80° to 100°, which can also be understood as vertical, rather than strictly limiting the angle between the two to 90°. Similarly, the parallel in the embodiments of the present application also includes situations similar to parallel, that is, the angle between lines, lines and planes, and planes is 0° to 10°, which can also be understood as parallel.

[0033] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery electrode provided in an embodiment of the present application. Figure 1 As shown, a battery electrode provided in an embodiment of the present application includes a electrode body 110, on which a plurality of first exhaust grooves 120 and a plurality of second exhaust grooves 130 are provided. The first exhaust grooves 120 intersect with the second exhaust grooves 130, and both the first exhaust grooves 120 and the second exhaust grooves 130 pass through the electrode body 110.

[0034] The first exhaust groove 120 intersects with the second exhaust groove 130 , indicating that the first exhaust groove 120 and the second exhaust groove 130 are arranged in different directions. The first exhaust groove 120 and the second exhaust groove 130 can discharge gas from the battery electrode from different directions.

[0035] like Figure 1 As shown, the first exhaust groove 120 and the second exhaust groove 130 both pass through the pole piece body 110, which means that the first exhaust groove 120 and the second exhaust groove 130 are both through grooves, and one end of the first exhaust groove 120 is located on one side of the pole piece body 110, and the other end of the first exhaust groove 120 is located on the other side of the pole piece body 110, and these two sides of the pole piece body 110 can be connected through the first exhaust groove 120. Similarly, one end of the second exhaust groove 130 is located on one side of the pole piece body 110, and the other end of the second exhaust groove 130 is located on the other side of the pole piece body 110, and these two sides of the pole piece body 110 can be connected through the second exhaust groove 130. It should be noted that the two sides connected by the first exhaust groove 120 and the two sides connected by the second exhaust groove 130 are not the same two sides.

[0036] For example, for the convenience of description, the left side of the pole piece body 110 is referred to as the first side, the right side of the pole piece body 110 is referred to as the second side, the lower side of the pole piece body 110 is referred to as the third side, and the upper side of the pole piece body 110 is referred to as the fourth side. The first exhaust groove 120 can connect the third side and the second side of the pole piece body 110, or connect the third side and the fourth side of the pole piece body 110, or connect the first side and the fourth side of the pole piece body 110. The second exhaust groove 130 can connect the third side and the first side of the pole piece body 110, or connect the third side and the fourth side of the pole piece body 110, or connect the second side and the fourth side of the pole piece body 110.

[0037] In the embodiment of the present application, by providing a plurality of first exhaust grooves 120 and a plurality of second exhaust grooves 130 on the electrode body 110, and providing the first exhaust grooves 120 and the second exhaust grooves 130 in a cross-arranged manner, when gas is generated in the battery, the gas can be discharged through the exhaust grooves on the electrode, thereby avoiding the formation of bubbles between the electrode sheets. In addition, since the first exhaust grooves 120 and the second exhaust grooves 130 are provided on the electrode, the first exhaust grooves 120 and the second exhaust grooves 130 can increase the distance between the positive and negative electrode sheets inside the bare battery cell during winding, reserve a certain amount of expansion space, and improve battery deformation. Moreover, the first exhaust grooves 120 and the second exhaust grooves 130 can store more electrolyte, increase the liquid retention capacity of the winding core, and enhance the performance of the battery cell.

[0038] In one embodiment of the present application, the angle between the first exhaust groove 120 and the pole piece body 110 in the length direction is 30° to 60°, and the angle between the second exhaust groove 130 and the pole piece body 110 in the width direction is 30° to 60°. For example, the angle between the first exhaust groove 120 and the pole piece body 110 in the length direction can be set to 30°, 45°, 60°, etc. The angle between the second exhaust groove 130 and the pole piece body 110 in the width direction can be set to 30°, 45°, 60°, etc.

[0039] In the embodiment of the present application, when the first exhaust groove 120 and the second exhaust groove 130 are provided, the first exhaust groove 120 and the second exhaust groove 130 have a certain angle with the long side direction of the pole piece, and those skilled in the art can set the size of the angle according to actual needs. Since the pole piece body 110 is generally rectangular, that is, the length direction of the pole piece body 110 is perpendicular to the width direction of the pole piece body 110. When the angle between the first exhaust groove 120 and the length direction of the pole piece body 110 is 30° to 60°, the angle between the first exhaust groove 120 and the width direction of the pole piece body 110 is 60° to 30°. Correspondingly, when the angle between the second exhaust groove 130 and the width direction of the pole piece body 110 is 30° to 60°, the angle between the second exhaust groove 130 and the length direction of the pole piece body 110 is 60° to 30°.

[0040] In one embodiment of the present application, reference Figure 2 and Figure 3 , Figure 2 A schematic cross-sectional view of a first exhaust groove 120 in a battery electrode provided in an embodiment of the present application; Figure 3 This is a cross-sectional schematic diagram of a second exhaust groove 130 in a battery electrode provided in an embodiment of the present application.

[0041] like Figure 2 and Figure 3 As shown, the first exhaust groove 120 is an arc-shaped exhaust groove, and the second exhaust groove 130 is also an arc-shaped exhaust groove. In the embodiment of the present application, the first exhaust groove 120 and the second exhaust groove 130 are both set as arc-shaped exhaust grooves, so that after the first exhaust groove 120 and the second exhaust groove 130 are set on the pole piece body 110, the areas where the first exhaust groove 120 and the second exhaust groove 130 are set on the pole piece body 110 can achieve a smooth transition, thereby ensuring the strength of the pole piece body 110.

[0042] The first exhaust groove 120 can be configured as an arc-shaped exhaust groove, an elliptical exhaust groove, or another arc-shaped exhaust groove. Similarly, the second exhaust groove 130 can be configured as an arc-shaped exhaust groove, an elliptical exhaust groove, or another arc-shaped exhaust groove. The embodiments of the present application do not limit the specific shapes of the first exhaust groove 120 and the second exhaust groove 130.

[0043] In one embodiment of the present application, Figure 2 and Figure 3 As shown, the first exhaust groove 120 is an arc-shaped exhaust groove, and the arc corresponding to the first exhaust groove 120 is 120° to 180°. The second exhaust groove 130 is also an arc-shaped exhaust groove, and the arc corresponding to the second exhaust groove 130 is 120° to 180°.

[0044] The arc corresponding to the first exhaust groove 120 is set to 120° to 180°, so that the first exhaust groove 120 is as smooth as possible while achieving exhaust. When the arc corresponding to the first exhaust groove 120 is 180°, the first exhaust groove 120 is a semicircular exhaust groove. Similarly, the arc corresponding to the second exhaust groove 130 is set to 120° to 180°, so that the second exhaust groove 130 is as smooth as possible while achieving exhaust. When the arc corresponding to the second exhaust groove 130 is 180°, the second exhaust groove 130 is also a semicircular exhaust groove.

[0045] In one embodiment of the present application, the radius R1 corresponding to the first exhaust groove 120 is 0.04 mm to 0.06 mm, and the radius R2 corresponding to the second exhaust groove 130 is 0.04 mm to 0.06 mm.

[0046] The larger the curvature corresponding to the first vent groove 120 and the larger the radius corresponding to the first vent groove 120, the more severe the protrusion formed by the first vent groove 120 on the pole piece body 110. Similarly, the larger the curvature corresponding to the second vent groove 130 and the larger the radius corresponding to the second vent groove 130, the more severe the protrusion formed by the second vent groove 130 on the pole piece body 110. Batteries include positive and negative pole pieces, and the positive and negative pole pieces are alternately stacked together. Therefore, if the protrusions formed by the first and second vent grooves 120, 130 are severe, it may affect the arrangement of the pole pieces.

[0047] In an embodiment of the present application, the radii corresponding to the first exhaust groove 120 and the second exhaust groove 130 are set within a reasonable range. Specifically, the radius R1 corresponding to the first exhaust groove 120 is 0.04mm to 0.06mm, and the radius R2 corresponding to the second exhaust groove 130 is 0.04mm to 0.06mm, so that the first exhaust groove 120 and the second exhaust groove 130 can form a certain groove shape to achieve functions such as exhaust. At the same time, no large protrusions will be generated on the pole piece body 110, affecting the stacking between the pole pieces. The protrusions formed by the first exhaust groove 120 and the second exhaust groove 130 can maintain a certain distance between two adjacent pole pieces when the pole pieces are stacked. This distance can be used as expansion space reserved between the pole pieces, which is beneficial to improving the problem of battery deformation.

[0048] In an embodiment of the present application, specifically, the radius R1 corresponding to the first exhaust groove 120 can be set to 0.05 mm, and the radius R2 corresponding to the second exhaust groove 130 can be set to 0.05 mm.

[0049] In one embodiment of the present application, the first exhaust groove 120 and the second exhaust groove 130 are both arc-shaped exhaust grooves, and they achieve the same function. Therefore, the size of the first exhaust groove 120 can be set to be the same as the size of the second exhaust groove 130. The above-mentioned size refers to the parameters such as the curvature and radius corresponding to the arc-shaped exhaust groove. The direction of the first exhaust groove 120 and the direction of the second exhaust groove 130 are different. As mentioned in the above embodiment, the first exhaust groove 120 and the second exhaust groove 130 intersect. In a specific embodiment, the first exhaust groove 120 and the second exhaust groove 130 can be set to be perpendicular to each other.

[0050] In one embodiment of the present application, a plurality of first exhaust grooves 120 and a plurality of second exhaust grooves 130 are provided on the pole piece body 110, wherein the plurality of first exhaust grooves 120 are arranged in the same direction, and the plurality of second exhaust grooves 130 are arranged in the same direction. The plurality of first exhaust grooves 120 can be arranged in parallel, and the plurality of second exhaust grooves 130 can be arranged in parallel. The plurality of first exhaust grooves 120 are arranged in parallel, and the plurality of second exhaust grooves 130 are arranged in parallel, so as to facilitate processing. At the same time, the plurality of first exhaust grooves 120 arranged in parallel and the plurality of second exhaust grooves 130 arranged in parallel can conveniently discharge the gas generated around the pole piece through different exhaust grooves, thereby avoiding gas accumulation between the pole pieces, resulting in bubbles between the pole pieces.

[0051] In one embodiment of the present application, the number of first exhaust grooves 120 and the number of second exhaust grooves 130 can be set as needed. The spacing between the plurality of first exhaust grooves 120 and the spacing between the plurality of second exhaust grooves 130 can also be set. The spacing between two adjacent first exhaust grooves 120 can be set to about ten times the radius of the first exhaust groove 120, and the spacing between two adjacent second exhaust grooves 130 can be set to about ten times the radius of the second exhaust groove 130. For example, the spacing between two adjacent first exhaust grooves 120 can be set to 0.4 mm to 0.6 mm, and the spacing between two adjacent second exhaust grooves 130 can be set to 0.4 mm to 0.6 mm.

[0052] In one embodiment of the present application, a core package is also provided. Figure 4 , Figure 4 This is a schematic diagram of the structure of a core package provided in an embodiment of the present application. Figure 4As shown, a core pack provided by an embodiment of the present application includes a positive electrode sheet 140, a negative electrode sheet 150 and a separator 160 stacked and wound, wherein the positive electrode sheet 140 adopts the battery sheet described in any of the above embodiments, and the separator 160 is arranged between the positive electrode sheet 140 and the negative electrode sheet 150. The positive electrode sheet 140 and the negative electrode sheet 150 are wound in the same direction to form Figure 4 Core package shown.

[0053] In one embodiment of the present application, a battery is further provided, which includes one or more core packs described in the above embodiments.

[0054] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the scope of protection of this application includes the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0057] This article uses specific examples to illustrate the working principles and implementation methods of the battery electrodes, core packs and batteries of this application. The description of the above embodiments is only used to help understand the specific settings and core ideas of this application; at the same time, for general technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

[0058] The above content is only a specific embodiment of this application, but the scope of protection of this application is not limited to this. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery electrode, characterized in that: It comprises a pole piece body, on which a plurality of first exhaust grooves and a plurality of second exhaust grooves are provided, wherein the first exhaust grooves intersect with the second exhaust grooves, and both the first exhaust grooves and the second exhaust grooves pass through the pole piece body.

2. The battery electrode according to claim 1, characterized in that: The angle between the first exhaust groove and the length direction of the pole piece body is 30° to 60°, and the angle between the second exhaust groove and the width direction of the pole piece body is 30° to 60°.

3. The battery electrode according to claim 2, characterized in that: The first exhaust groove is an arc-shaped exhaust groove, and the second exhaust groove is also an arc-shaped exhaust groove.

4. The battery electrode according to claim 3, characterized in that: The arc angle corresponding to the first exhaust groove is 120° to 180°, and the arc angle corresponding to the second exhaust groove is 120° to 180°.

5. The battery electrode according to claim 4, characterized in that: The radius corresponding to the first exhaust groove is 0.04 mm to 0.06 mm, and the radius corresponding to the second exhaust groove is 0.04 mm to 0.06 mm.

6. The battery electrode according to claim 5, characterized in that: The radius corresponding to the first exhaust groove is 0.05 mm, and the radius corresponding to the second exhaust groove is 0.05 mm.

7. The battery pole piece according to any one of claims 1 to 6, characterized in that: The size of the first exhaust groove is the same as the size of the second exhaust groove.

8. The battery electrode according to claim 7, characterized in that: A plurality of the first exhaust slots are arranged in parallel, and a plurality of the second exhaust slots are arranged in parallel.

9. The battery pole piece according to claim 8, characterized in that: The distance between two adjacent first exhaust grooves is 0.4 mm to 0.6 mm, and the distance between two adjacent second exhaust grooves is 0.4 mm to 0.6 mm.

10. A core package, characterized in that: It comprises a positive electrode sheet, a negative electrode sheet and a separator that are stacked and wound, the positive electrode sheet is configured as a battery sheet according to any one of claims 1 to 9, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

11. A battery, characterized in that: Including the core package according to claim 10.

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